[0001] The present invention relates to an engine and, in particular, to a stroke discriminating
device in four-stroke having a plurality cylinder engine of fuel injection type.
[0002] A fuel injection type, four-stroke engine is configured, for example, to inject and
supply fuel to an intake port or the like in an intake stroke and further to ignite
the fuel at a moment around the end of a compression stroke. Accordingly, it is necessary
to determine that in which strokes respective cylinders exist.
[0003] On the other hand, in the four-stroke engine, the intake, compression, combustion
and exhaust strokes are performed while the crankshaft rotates twice (720°). Thus,
the intake stroke and the combustion stroke, or the compression stroke and the exhaust
stroke cannot be discriminated from each other only by detecting phases (rotational
angular positions) of a crankshaft.
[0004] Conventionally, for example in JP10-227252A, a stroke discriminating device is suggested
as one of those for the four-stroke engine. The suggested stroke discriminating device
discriminates between the intake stroke and the combustion stroke, and between the
compression stroke and the exhaust stroke, from mutual relationships between a phase
of the crankshaft and intake pressures of the respective cylinders that change periodically.
[0005] However, the conventional stroke discriminating device discussed above has intake
pressure detection tubes, which are connected to intake conduits of multiple cylinders
respectively, merge together to detect a compound intake pressure, and discriminates
the strokes from each other using a periodical change of the compound intake pressure
that occurs with the rotation of the crankshaft, or discriminates the strokes using
a stroke discriminating sensor(s).
[0006] Thus arises a problem that a structure for compounding the intake pressures is complicated.
Also, there are problems regarding a space and an economical burden if the stroke
discriminating sensor is used. Further, the crankshaft needs to rotate twice or more
if the stroke discrimination is made by those measures. The discrimination among the
strokes can take much time, accordingly.
[0007] As a result, for example, a self-starting motor is required to rotate longer when
the engine is started, and the engine is likely to be judged sensuously that its startability
is inferior.
[0008] Under the conventional circumstances discussed above, an object of the present invention
is to provide an engine having a stroke discriminating device that has a simple structure
and can reduce the number of rotation of the crankshaft that is necessary to complete
the stroke discrimination.
[0009] This objective is solved in an inventive manner by an engine, in particular four-stroke
engine, having at least two cylinders, which ignition timings differ from each other,
and a stroke discriminating device for discriminating strokes of said at least two
cylinders based upon a difference between intake pressures detected by intake pressure
sensors for individually detecting intake pressures of said at least two cylinders.
[0010] Preferably, the stroke discriminating means compares a difference of one of the detected
intake pressures and a pre-determined pressure threshold value with the other one
of the detected intake values.
[0011] Further, preferably the engine comprises a plurality of cylinders, which ignition
timings differ from each other, wherein any two of said plurality of cylinders are
provided with intake pressure sensors for individually detecting intake pressures,
and wherein the stroke discriminating means discriminates the strokes of said two
cylinders based upon a difference between the intake pressures detected by said two
intake pressure sensors.
[0012] Still further, preferably the engine comprises a plurality of cylinders, which ignition
timings differ from each other, wherein each cylinder of the engine is provided with
intake pressure sensors for individually detecting intake pressures, and wherein the
stroke discriminating means discriminates the strokes of the cylinders based upon
a difference between the intake pressures detected by intake pressure sensors for
two cylinders out of said plurality of cylinders.
[0013] According to a preferred embodiment, the engine is a two-cylinder engine, wherein
the stroke discriminating device is adapted to compare a first intake pressure of
a first cylinder, one of said two cylinders, and a second intake pressure of a second
cylinder, the other of the two cylinders, occurring at the same moment, to determine
a pressure threshold value, and to determine that the first cylinder is in an intake
stroke if said first intake pressure is lower than a difference between said second
intake pressure and said pressure threshold value.
[0014] According to a further preferred embodiment, the engine is a four-cylinder engine,
wherein the stroke discriminating means is adapted to compare a first intake pressure
of a first cylinder, one of the four cylinders, and a second intake pressure of a
second cylinder, another of the four cylinders, occurring at the same moment, to determine
a pressure threshold value, and to determine that said first cylinder is in an intake
stroke if said first intake pressure is lower than a difference between said second
intake pressure and said pressure threshold value.
[0015] Beneficially, there is further provided a rotational speed detecting means for detecting
an engine speed, wherein the stroke discriminating means is adapted to discriminate
the strokes of two of the cylinders based upon a difference between the intake pressures
of said two cylinders detected by said intake pressure sensors if the engine speed
detected by the rotational speed detecting means is less than a predetermined speed
threshold value.
[0016] In the following, the present invention is explained in further detail with respect
to several embodiments thereof in conjunction with the accompanying drawings, wherein:
- Fig. 1
- is a whole constructive view of a stroke discriminating device of a first embodiment,
- Fig. 2
- is a constructive block diagram of a cylinder discriminating device in the stroke
discriminating device of the first embodiment;
- Figs. 3
- is a diagram of an intake pressure change characteristic for describing a stroke discriminating
operation of the stroke discriminating device of the first embodiment;
- Fig. 4
- is a flowchart for describing the stroke discriminating operation of the stroke discriminating
device of the first embodiment;
- Fig. 5
- is a diagram of an intake pressure characteristic of a stroke discriminating device
of a second embodiment in which the teaching of the present embodiment is applied
to a four-cylinder engine;
- Fig. 6
- is a flowchart for describing a processing operation of the stroke discriminating
device in the second embodiment;
- Fig. 7
- is a flowchart for describing a processing operation of a stroke discriminating device
in a variation of the second embodiment;
- Fig. 8
- is a flowchart for describing a processing operation of a stroke discriminating device
in another variation of the second embodiment;
- Fig. 9
- is a characteristic diagram, showing relationships between an engine speed and an
intake pressure for describing timings at which a stroke discrimination of a third
embodiment is performed; and
- Fig. 10
- is a flowchart for describing a processing operation of a stroke discriminating device
in the third embodiment.
[0017] Hereunder, embodiments are described with reference to the accompanying drawings,
in which:
[0018] Fig. 1 is a view, schematically showing the whole configuration for describing a
cylinder discriminating device in accordance with a first embodiment.
[0019] As shown in Fig. 1, the cylinder discriminating device of the present embodiment
has a V-type, two-cylinder engine 1, in the first place. In the V-type, two-cylinder
engine 1, a first cylinder 3 and a second cylinder 4 are disposed above a crankcase
2 to form a Vee bank with a predetermined bank angle.
[0020] First and second cylinder heads 5, 6 are disposed above and coupled with the first
and second cylinders 3, 4, respectively.
[0021] Within a first cylinder bore 3a and a second cylinder bore 4a which are formed in
the first cylinder 3 and the second cylinder 4, respectively, a piston 7 and a piston
8 are slidably disposed, respectively.
[0022] The piston 7 and the piston 8 are coupled with a crank pin 11a of a crankshaft 11,
which is common to both of the cylinders, by a connecting rod 9 and a connecting rod
10, respectively.
[0023] Generally, the pistons 7 and 8 move up and down with the rotation of the crankshaft
11 to perform the intake, compression, combustion and exhaust strokes in sequence.
[0024] An intake port 5a and an exhaust port 5b are formed together in the cylinder head
5 disposed atop the first cylinder bore 3a. The intake port 5a and the exhaust port
5b are opened and closed by an intake valve 12 and an exhaust valve 12a, respectively,
both of which are disposed at openings which are communicatively formed to the cylinder
head. Also, an ignition plug 5c is disposed between the intake port 5a and the exhaust
port 5b.
[0025] Similarly, an intake port 6a and an exhaust port 6b are formed together in the second
cylinder head 6 disposed atop the second cylinder bore 4a. The intake port 6a and
the exhaust port 6b are opened and closed by an intake valve 13 and an exhaust valve
13a, respectively, both of which are disposed at openings which are communicatively
formed to the cylinder head. Also, an ignition plug 6c is disposed between the intake
port 6a and the exhaust port 6b.
[0026] Additionally, portions of the intake ports 5a and 6a are unitarily formed with and
within the cylinder heads 5 and 6, respectively, and the remainder portions thereof
are formed with intake pipes or the like other than the cylinder heads 5, 6.
[0027] Also, fuel injection valves 14 and 15 are disposed adjacent to the intake valves
12 and 13 upstream thereof in the intake ports 5a and 6a, respectively. In addition,
throttle valves 16 and 17 are disposed upstream of the fuel injection valves 14 and
15, respectively.
[0028] Also, a first intake pressure sensor 18 and a second intake pressure sensor 19 that
detect an intake pressure are connected to portions located upstream and adjacent
to the throttle valves 16 and 17, respectively. An air cleaner 20, which is common
to both cylinders, is connected to ends of the intake ports 5a and 6a at upstream
ends of the sensors.
[0029] Additionally, the first intake pressure sensor 18 and the second intake pressure
sensor 19 are usually furnished to detect an operational load of an engine in general.
In this embodiment, however, detection values of the intake pressure sensors that
are provided for detecting the loads are also utilized for discriminating strokes.
[0030] Also, a crank sensor 21 is furnished to detect a rotational angular position of the
crankshaft 11 (rotational number of the crankshaft 11) that rotates within the crankcase
2. This crank sensor 21 is positioned, for example, opposing to projections and recesses
engraved with a preset pitch on a circumferential surface or the like of an encoder
that is mounted on an end of the crankshaft 11. The crank sensor 21 generates crank
pulses appearing corresponding to the pitch of the projections and recesses. The engine
speed is detected by the density of the crank pulses per unit time.
[0031] A detection value output from this crank sensor 21 and detection value outputs from
the first intake pressure sensor 18 and the second intake pressure sensor 19 are inputted
to an electronic control unit (ECU) 22.
[0032] The control unit (ECU) 22 is a control device to control an operational condition
of this V-type, two-cylinder engine 1, and controls a fuel injection timing and an
ignition timing based upon the detection values inputted from the first and second
intake pressure sensors 18 and 19 and the crank sensor 21.
[0033] Fig. 2 is a block diagram of a stroke discriminating device in connection with the
V-type, two-cylinder engine 1. Incidentally, in Fig. 2, blocks that have the same
functions as those shown in Fig. 1 are indicated by the same reference numerals as
Fig. 1.
[0034] As shown in Fig. 2, the electronic control unit (ECU) 22 of the cylinder discriminating
device in this embodiment comprises a CPU (central processing unit) 23, a power supply
circuit 24 connected to the CPU 23 through a bus, an input I/F (interface) circuit
25 and an actuator drive circuit 26.
[0035] Electric power is inputted to the power supply circuit 24 from an external main power
source. Outputs of the detection values of the crank sensor 21, #1 (first cylinder,
indicated similarly hereunder) intake pressure sensor 18 and #2 intake pressure sensor
19 are inputted to the input I/F (interface) circuit 25.
[0036] The CPU 23 is supplied with the electric power from the power supply circuit 24,
and controls drive timings of injectors of the fuel injection valves 14 and 15 and
ignition coils of the ignition plugs 5c and 6c through the actuator drive circuit
26 based upon the detection values of the crank sensor 21, #1 intake pressure sensor
18 and #2 intake pressure sensor 19, inputted through the input I/F (interface) circuit
25.
[0037] For instance, the top dead center and the bottom dead center are determined from
the output values of the crank sensor 21, and the ignition timing is controlled to
be advanced or retarded, using the top dead center as a reference.
[0038] In the stroke discrimination of the present embodiment, the control unit 22 compares
a first intake pressure "#1Pb" of the first cylinder 3a and a second intake pressure
"#2Pb" of the second cylinder 4a with each other, and determines that the first cylinder
3a is in the intake stroke if the first intake pressure "#1Pb" is lower than a difference
between the second intake pressure "#2Pb" and a predetermined pressure threshold value.
[0039] Fig. 3 is a diagram, showing an intake pressure change characteristic for describing
a stroke discriminating operation of the stroke discriminating device in this embodiment.
Fig. 3 shows, in sequence from the top, an operation timing of a starter SW (switch),
operation timings of the first cylinder's strokes, operation timings of the second
cylinder's strokes, crank pulses, an intake pressure waveform of the first cylinder,
and an intake pressure waveform of the second cylinder.
[0040] In the V-type, two-cylinder engine 1 of this embodiment, as shown in Fig. 3, the
respective strokes are decided such that the second cylinder bore 4a is in the combustion
stroke while the first cylinder bore 3a is in the intake stroke. Accordingly, the
first cylinder bore 3a and the second cylinder bore 4a can be cylinders that have
different ignition timings.
[0041] Additionally, in this regard, the crank pin 11a is common to the first cylinder bore
3a and the second cylinder bore 4a as shown in Fig. 1. However, because the first
cylinder bore 3a and the second cylinder bore 4a form the Vee bank, intervals of the
ignition timings are irregularly parted intervals corresponding to this bank angle.
Specifically, for example, an initial ignition interval is "360°- the bank angle"
and the next ignition interval is "360°+ the bank angle."
[0042] For example, as shown in Fig. 3, the intake pressure in the intake ports does not
change so much during strokes such as the compression, combustion and exhaust strokes
in which the intake valves 12 and 13 are closed. The intake pressure, however, falls
greatly during a stroke such as the intake stroke in which the intake valves are open.
[0043] Thus, in all the engines that have a phase difference between intake strokes of respective
cylinders, the intake pressures of both cylinders greatly differ from each other at
a moment when one of the cylinders is in the intake stroke. The cylinder that has
a lower intake pressure thus can be determined to be in the intake stroke at the moment
when the difference between the intake pressures occurs.
[0044] In this occasion, a range between a crank angle at a moment when the great difference
between the intake pressures occurs first and another crank angle at a moment when
the great difference between the intake pressures occurs second is "360°- the bank
angle" or "360°+ the bank angle" in the V-type, two-cylinder engine 1. The discrimination
of the intake stroke thus ends while the crankshaft 11 generally rotates once. That
is, the number of rotation of the crankshaft that is necessary to complete the stroke
discrimination can be reduced to once.
[0045] Fig. 4 is a flowchart, illustrating the stroke discriminating operation of the stroke
discriminating device configured in accordance with the first embodiment.
[0046] In Fig. 4, upon a start of the intake stroke discriminating operation, instantaneous
values "#1Pb" and "#2Pb", detected by the first intake pressure sensor 18 and the
second intake pressure sensor 19 are read (step S1).
[0047] Then, "the first intake pressure #1Pb" and "the second intake pressure #2Pb - the
pressure threshold value" are compared with each other (step S2).
[0048] If "the first intake pressure #1Pb" is smaller than "the second intake pressure #2Pb
- the pressure threshold value" in this determination ("Yes" in S2), the first cylinder
bore 3a is determined to be in the intake stroke (step S3), and the stroke discriminating
operation ends (step S6).
[0049] Also, in the determination in the step S2, if "the first intake pressure #1Pb" is
not smaller than "the second intake pressure #2Pb - the pressure threshold value,"
i.e., when "the first intake pressure #1Pb" is larger than "the second intake pressure
#2Pb - the pressure threshold value" ("No" in S2), "the second intake pressure #2Pb"
and "the first intake pressure #1Pb - the pressure threshold value" are uninterruptedly
compared with each other (step S4).
[0050] If "the second intake pressure #2Pb" is smaller than "the first intake pressure #1Pb
- the pressure threshold value" ("Yes" in S4), the second cylinder bore 4a is determined
to be in the intake stroke (step S5). Then, the stroke discriminating operation ends
(step S6).
[0051] On the other hand, if "the second intake pressure #2Pb" is not smaller than "the
first intake pressure #1Pb - the pressure threshold value," i.e., when "the second
intake pressure #2Pb" is larger than "the first intake pressure #1Pb - the pressure
threshold value" ("No" in S2), the program returns to the process of the step S1 and
the processes of steps S1 to S5 are repeated.
[0052] As thus described, in the present embodiment, a difference between the first intake
pressure #1Pb and the second intake pressure #2Pb is discriminated using the predetermined
pressure threshold value. If a predetermined difference is discriminated, a cylinder
which has a lower intake pressure is determined to be in the intake stroke.
[0053] Thus, the number of rotation of the crankshaft 11 that is necessary to complete the
stroke discrimination can be reduced generally to once. A period of time for rotating
a self-starting motor when the engine is started can be greatly shortened, and engine
start feeling can be greatly improved, accordingly.
[0054] Also, the structure is quite simple because the intake pressure sensors which are
usually furnished for detecting the operational loads of the engine in general is
used to make the stroke discrimination. In addition, because no new sensors need to
be added, the stroke discriminating device does not invite a rise of cost and thus
is economical.
[0055] Fig 5 is a diagram of an intake pressure characteristic of a stroke discriminating
device configured in accordance with a second embodiment in which the teaching of
the present embodiment is applied to a four-cylinder engine. Fig. 5 shows, in sequence
from the top, #1 (first cylinder, indicated similarly hereunder) stroke, #2 stroke,
#3 stroke, #4 stroke, #1 intake pressure waveform, #2 intake pressure waveform, #3
intake pressure waveform, and #4 intake pressure waveform.
[0056] Fig. 6 is a flowchart, illustrating a processing operation of the stroke discriminating
device in the second embodiment.
[0057] In this second embodiment, all the intake ports of the first to fourth cylinders
have the intake pressure sensor.
[0058] In the second embodiment, as shown in Fig. 6, instantaneous values #1Pb, #2Pb, #3Pb
and #4Pb of the intake pressures of all the cylinders are read (step S11).
[0059] Initially, "the first intake pressure #1Pb" and "the fourth intake pressure #4Pb
- the pressure threshold value" are compared with each other (step S12).
[0060] In this comparative discrimination, if "the first intake pressure #1Pb" is smaller
than "the fourth intake pressure #4Pb - the pressure threshold value" ("Yes" in S12),
the first cylinder is determined to be in the intake stroke (step S13). Then, the
stroke discrimination ends.
[0061] On the other hand, in the comparative discrimination in the step S12, if "the first
intake pressure #1Pb" is not smaller than "the fourth intake pressure #4Pb - the pressure
threshold value," i.e., when "the first intake pressure #1Pb" is larger than "the
fourth intake pressure #4Pb - the pressure threshold value" ("No" in S12), "the second
intake pressure #2Pb" and "the third intake pressure #3Pb - the pressure threshold
value" are uninterruptedly compared with each other (step S14).
[0062] If "the second intake pressure #2Pb" is smaller than "the third intake pressure #3Pb
- the pressure threshold value" ("Yes" in S14), the second cylinder is determined
to be in the intake stroke (step S15). Then, the stroke discriminating operation ends.
[0063] Similarly, if "the third intake pressure #3Pb" is smaller than "the second intake
pressure #2Pb - the pressure threshold value," the third cylinder is determined to
be in the intake stroke (steps S16 and S17).
[0064] Also, if "the fourth intake pressure #4Pb" is smaller than "the first intake pressure
#1Pb - the pressure threshold value," the fourth cylinder is determined to be in the
intake stroke (steps S18 and S19).
[0065] As thus described, in the second embodiment, all of the four cylinders have the intake
pressure sensor, and each sensor detects a difference between the intake pressures
of the respective cylinders. The intake cylinder is discriminated based upon the differences.
Thus, the number of rotation of the crankshaft that is necessary to complete the stroke
discrimination can be reduced generally to a half rotation. The startability is further
improved in this embodiment, accordingly.
[0066] Although all of the four cylinders have the intake pressure sensor in the second
embodiment, two of those four cylinders may have the intake pressure sensor, and thereby,
the same actions and effects as the first embodiment can be obtained. This arrangement
is described below as a variation of the second embodiment.
[0067] Fig. 7 is a flowchart, illustrating a processing operation of the stroke discriminating
device in the variation of the second embodiment.
[0068] In this variation, only two cylinders in the four-cylinder engine have the intake
pressure sensor. In the variation shown in Fig. 7, the first cylinder and the fourth
cylinder have the intake pressure sensor.
[0069] In Fig. 7, first, instantaneous values of the first intake pressure #1Pb and the
fourth intake pressure #4Pb are read (step S21).
[0070] If "the first intake pressure #1Pb" is smaller than "the fourth intake pressure #4Pb
- the pressure threshold value," the first cylinder is determined to be in the intake
stroke (steps S21 to S23).
[0071] On the other hand, if "the fourth intake pressure #4Pb" is smaller than "the first
intake pressure #1Pb - the pressure threshold value," the fourth cylinder is determined
to be in the intake stroke (steps S24 and 25).
[0072] Fig. 8 is a flowchart, illustrating a processing operation of the stroke discriminating
device in another variation of the second embodiment. In the variation shown in Fig.
8, the first cylinder and the third cylinder have the intake pressure sensor.
[0073] In Fig. 8, first, instantaneous values of the first intake pressure #1Pb and the
third intake pressure #3Pb are read (step S31).
[0074] If "the first intake pressure #1Pb" is smaller than "the third intake pressure #3Pb
- the pressure threshold value," the first cylinder is determined to be in the intake
stroke (steps S31 to S33).
[0075] On the other hand, if "the third intake pressure #3Pb" is smaller than "the first
intake pressure #1Pb - the pressure threshold value," the third cylinder is determined
to be in the intake stroke (steps S34 and S35).
[0076] As described above, the same actions and effects as those of the first embodiment
can be obtained only when two cylinders of the four cylinders have the intake pressure
sensor.
[0077] Turning to another aspect, occasionally, inconvenience such as a backfire due to
imperfect combustion is likely to occur if, for example, ignition timings are deviated
in a range of high engine speed such as 4,000 to 5,000 rpm under an engine brake is
made with a throttle being closed.
[0078] The imperfect combustion and the backfire occur when an amount of fuel that are injected
to each cylinder is not proper, or when the ignition timings do not meet the intake
or compression stroke, and indicate that the stroke discrimination by the control
unit against the engine is not appropriate.
[0079] In connection with a third embodiment, a processing operation of a stroke discriminating
device that properly performs the stroke discrimination for a four-stroke engine irrespective
of those performed in a low speed or in a high speed is described.
[0080] Fig. 9 is a characteristic diagram that indicates relationships between an engine
speed and an intake pressure for describing timings at which the stroke discrimination
of the third embodiment is performed.
[0081] Fig. 9 shows, in sequence from the top, #1 (first cylinder, indicated similarly hereunder)
stroke, #2 stroke, crankshaft encoder pulses, #1 intake pressure waveform and #2 intake
pressure waveform both at the start time, and #1 intake pressure waveform and #2 intake
pressure waveform both in a high speed operation.
[0082] As shown in Fig. 9, in a low speed at the start time of the engine, the #2 intake
pressure waveform is the minimum at the timing t1 of the crankshaft encoder pulse
output and the #2 intake stroke is discriminated. Also, the #1 intake pressure waveform
is the minimum at the timing t2 of the crankshaft encoder pulse output and the #1
intake stroke is discriminated.
[0083] Accordingly, all the control unit (ECU) 22 needs to do at the start time of the engine
is to make ignitions at ignition timings that are decided based upon the intake stroke
that has been discriminated as described above.
[0084] However, in a high speed operation of the engine, as indicated by the #1 intake pressure
waveform and the #2 intake pressure waveform both of which appear at the bottom of
Fig. 9 for showing the high speed operation, the large-small relationships between
the instantaneous values "#1Pb" and "#2Pb" of the first intake pressure sensor 18
and the second intake pressure sensor 19 those of which are given in the #1 intake
pressure waveform and the #2 intake pressure waveform, respectively, at the timings
t1 and t2 of the foregoing crankshaft encoder pulse output are reversed in comparison
with those at the start of the engine.
[0085] That is, in the high speed operation, the magnitudes of the respective intake pressures
at the timings t1 and t2 of the crankshaft encoder pulse outputs, at which the intake
stroke should be determined by the intake pressures, are reversed from those at the
start time of the engine.
[0086] Thus, if the ignition control is conducted using the discrimination performed for
the #2 intake stroke and the #1 intake stroke at the timings t1 and t2 of the crankshaft
encoder pulse outputs in a low speed, the control can be improper.
[0087] In this embodiment, the stroke discrimination is performed in a range lower than
a predetermined engine speed so as to maintain the improvement of the startability
and also to inhibit the imperfect combustion, the backfire and so forth in the high
speed operation from occurring.
[0088] Fig. 10 is a flowchart, illustrating a processing operation of the stroke discriminating
device in the third embodiment as such discussed.
[0089] In Fig. 10, the electronic control unit (ECU) power supply is activated, and the
instantaneous values #1Pb" and #2Pb" of the first intake sensor 18 and the second
intake pressure sensor 19 are read (step S42).
[0090] At this moment, in this embodiment, a determination whether the engine speed is less
than a predetermined speed threshold value or not is performed (step 43).
[0091] The predetermined speed threshold value of the foregoing engine speed is, in Fig.
9, an engine speed adjacent to the speed at which the large-small relationships of
the values #1Pb and #2Pb are reversed at the timings t1 and t2 of the crankshaft encoder
pulse outputs.
[0092] If the engine speed is less than the predetermined speed threshold value ("Yes" in
S43), the control unit executes the steps S44 to S48, completes the stroke discrimination
process of the cylinders, and moves to the sequential ignition/ injection control
(step S49).
[0093] Additionally, the processes of the steps S44 to S48 are the same as the steps S2
to S6 of the stroke discriminating process in the first embodiment shown in Fig. 4.
[0094] On the other hand, if the engine speed exceeds the predetermined engine speed in
the determination of the engine speed at the step S43 ("No" in S43), the control unit
conducts, for the time being, a process using an ignition/ injection control (group
control) in which the same phases are applied in common to those two cylinders, without
discriminating the intake stroke (step S41), and repeats the processes of the steps
S42 and S43.
[0095] Therefore, in the high speed operation, the inconveniences such as the imperfect
combustion and the backfire that are caused by conducting the ignition/ injection
control in accordance with the strokes that have been discriminated in the low speed
operation when the engine starts can be inhibited from occurring, although the large-small
relationships between the first intake pressure #1Pb and the second intake pressure
#2Pb are reversed from those at the start time.
[0096] Additionally, in the third embodiment, the stroke discrimination process of the cylinders
based upon the engine speed was described in connection with the two-cylinder engine.
Needless to say, however, not being limited to the engine, the four-cylinder engine
described in the foregoing second embodiment can be applied with the stroke discrimination
process of the cylinders based upon the engine speed.
[0097] As thus described, regardless of a two-cylinder engine or a four-cylinder engine,
by adding the condition that an engine speed is less than a threshold value, the discrimination
of the intake stroke can be performed more accurately, and the inconveniences such
as the imperfect combustion and the backfire in a high speed operation can be inhibited.
[0098] Within the foregoing description, there is described a particularly preferable embodiment
of a stroke discriminating device for a four-stroke engine.
[0099] This preferable stroke discriminating device for a four-stroke engine is configured
by comprising: a plurality of cylinders which ignition timings differ from each other;
intake pressure sensors for individually detecting intake pressures of any two of
said plurality of cylinders; and stroke discriminating means for discriminating the
strokes of said two cylinders based upon a difference between the intake pressures
detected by said two intake pressure sensors.
[0100] In accordance with this stroke discriminating device, each stroke of the cylinder
is discriminated based upon the difference between the intake pressures of two cylinders
which ignition timings differ from each other. That is, for example, the first cylinder
is determined to be in the intake stroke if the first intake pressure is lower than
the difference between the second intake pressure and the threshold value. Thus, the
number of rotation of the crankshaft that is necessary to complete the stroke discrimination
can be reduced.
[0101] This stroke discriminating device is configured, for example, to compare a first
intake pressure of a first cylinder and a second intake pressure of a second cylinder,
occurring at the same moment, and to determine that the first cylinder is in an intake
stroke if the first intake pressure is lower than a difference between the second
intake pressure and a predetermined pressure threshold value.
[0102] Also, even more accurate intake strokes of having a plurality cylinder can be determined
by adding the determination whether the engine speed is less than the speed threshold
value before discriminating the strokes of the cylinders based upon the difference
between the intake pressures.
[0103] Thereby, an inconvenience such that, for example, an engine stops during a high engine
speed under a condition that an engine brake is made can be avoided.
[0104] Likewise, there is described a beneficial embodiment of the stroke discriminating
device for a four-stroke engine configured by comprising: a plurality of cylinders
which ignition timings differ from each other; intake pressure sensors for individually
detecting intake pressures of any two of said plurality of cylinders; rotational speed
detecting means for detecting an engine speed; and stroke discriminating means for
discriminating the strokes of said two cylinders based upon a difference between the
intake pressures of said two cylinders detected by said intake pressure sensors if
the engine speed detected by the rotational speed detecting means is less than a predetermined
speed threshold value.
[0105] The stroke discriminating means are configured, for example, to compare a first intake
pressure of a first cylinder and a second intake pressure of a second cylinder, occurring
at the same moment, and determine a speed threshold value, if said engine speed is
less than said predetermined speed threshold value; and configured to determine that
said first cylinder is in an intake stroke if said first intake pressure is lower
than a difference between said second intake pressure and said speed threshold value.
[0106] Thus, in short, in order to provide a cylinder discriminating device for a four-stroke
engine that has a simple structure and can reduce the number of rotation of a crankshaft
that is necessary for completion of the stroke discrimination according to a most
preferred embodiment, there are included intake pressure sensors for detecting intake
pressures of two cylinders in a plurality of cylinders which ignition timings differ
from each other, wherein the stroke discriminating means discriminates each stroke
of the cylinders based upon a difference between the intake pressures detected by
those two intake pressure sensors.
1. Engine, in particular four-stroke engine (1), having at least two cylinders (3,4),
which ignition timings differ from each other, and a stroke discriminating device
for discriminating strokes of said at least two cylinders (3,4) based upon a difference
between intake pressures (Pb) detected by intake pressure sensors (18,19) for individually
detecting intake pressures (Pb) of said at least two cylinders (3,4).
2. Engine according to claim 1, characterized in that the stroke discriminating means compares a difference of one of the detected intake
pressures and a pre-determined pressure threshold value with the other one of the
detected intake values.
3. Engine according to claim 1 or 2, characterized in that the engine comprises a plurality of cylinders, which ignition timings differ from
each other, wherein any two of said plurality of cylinders are provided with intake
pressure sensors for individually detecting intake pressures, and wherein the stroke
discriminating means discriminates the strokes of said two cylinders based upon a
difference between the intake pressures detected by said two intake pressure sensors.
4. Engine according to one of the claims 1 to 3, characterized in that the engine comprises a plurality of cylinders, which ignition timings differ from
each other, wherein each cylinder of the engine is provided with intake pressure sensors
for individually detecting intake pressures, and wherein the stroke discriminating
means discriminates the strokes of the cylinders based upon a difference between the
intake pressures detected by intake pressure sensors for two cylinders out of said
plurality of cylinders.
5. Engine according to one of the claims 2 to 4, characterized in that the engine is a two-cylinder engine, wherein the stroke discriminating device is
adapted to compare a first intake pressure (#1Pb) of a first cylinder (3), one of
said two cylinders (3,4), and a second intake pressure (#2Pb) of a second cylinder
(4), the other of the two cylinders (3,4), occurring at the same moment, to determine
a pressure threshold value, and to determine that the first cylinder (3) is in an
intake stroke if said first intake pressure (#1Pb) is lower than a difference between
said second intake pressure (#2Pb) and said pressure threshold value.
6. Engine according to one of the claims 2 to 4, characterized in that the engine is a four-cylinder engine, wherein the stroke discriminating means is
adapted to compare a first intake pressure (#1Pb) of a first cylinder (#1), one of
the four cylinders (#1,#2,#3,#4), and a second intake pressure (#2Pb) of a second
cylinder (#2), another of the four cylinders (#1,#2,#3,#4), occurring at the same
moment, to determine a pressure threshold value, and to determine that said first
cylinder (#1) is in an intake stroke if said first intake pressure (#1Pb) is lower
than a difference between said second intake pressure (#2Pb) and said pressure threshold
value.
7. Engine according to one of the claims 1 to 6, characterized by a rotational speed detecting means (21) for detecting an engine speed, wherein the
stroke discriminating means is adapted to discriminate the strokes of two of the cylinders
based upon a difference between the intake pressures of said two cylinders detected
by said intake pressure sensors if the engine speed detected by the rotational speed
detecting means is less than a predetermined speed threshold value.