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(11) | EP 2 058 491 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Control system for internal combustion engine |
| (57) In a system for controlling an internal combustion engine (12) mounted on a vehicle
(10) and having an electric motor (44) that drives a throttle valve (24) installed
in an intake pipe (22) of the engine and an accelerator (16) installed to be operable
by the operator, it is configured to comprise a motor controller that conducts one
of a full-step drive control for driving the motor at a full-step angle θf, a micro-step
drive control for driving the motor at a micro-step angle θm which is made by dividing
the full-step angle and a variable-step drive control for driving the motor at a step
angle θv which changes in response to a control difference d between actual throttle
opening and desired throttle opening, and controls the operation of the motor so as
to decrease the difference (66, S24, S30, S34). With this, it becomes possible to
improve response and control accuracy of the throttle valve and also enhances drivability.
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