EP 0546827 B1 19970409 - A combustion condition detecting and control device for an internal combustion engine
Title (en)
A combustion condition detecting and control device for an internal combustion engine
Title (de)
Zustandsdetektion- und Steuerungsvorrichtung der Verbrennung für eine Brennkraftmaschine
Title (fr)
Dispositif de commande et de détection des conditions de combustion par un moteur à combustion interne
Publication
Application
Priority
- JP 5204192 A 19920311
- JP 17439892 A 19920701
- JP 18620992 A 19920618
- JP 32613891 A 19911210
Abstract (en)
[origin: EP0546827A2] In a burning condition detecting device in an internal combustion engine in which a high voltage is applied to a spark plug by way of a diode and a series gap of a distributor. A voltage charger circuit is provided to on-off actuates the primary coil to induce a charging voltage in the secondary circuit either during establishing the spark discharge or during a predetermined period of time immediately after an end of the spark discharge. The charging voltage is applied to the spark plug to electrically charge a stray capacity inherent in the spark plug so as to form a sparkplug voltage. A voltage divider circuit is provided to divide the sparkplug voltage in accordance with a high impedance element and a low impedance element. A voltage level detecting circuit is provided to detect a sparkplug voltage waveform divided by the voltage divider circuit. A distinction circuit detects a degree of variation of an attenuation time period of the spark plug voltage waveform so as to determine a variation of an air-fuel ratio of an air-fuel mixture gas injected into a cylinder of the internal combustion engine by a fuel injector. <IMAGE>
IPC 1-7
IPC 8 full level
F02D 35/02 (2006.01); F02D 41/14 (2006.01); F02P 17/12 (2006.01); F02P 17/00 (2006.01)
CPC (source: EP)
F02D 35/021 (2013.01); F02P 17/12 (2013.01); F02P 2017/006 (2013.01); F02P 2017/121 (2013.01); F02P 2017/123 (2013.01); F02P 2017/125 (2013.01)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0546827 A2 19930616; EP 0546827 A3 19940216; EP 0546827 B1 19970409
DOCDB simple family (application)
EP 92311273 A 19921210