Engine control system

A control apparatus of an engine for controlling a throttle valve opening degree in response to a demand output of a driver, the engine having at least one cylinder, an intake pipe connected to the cylinder, a throttle valve disposed in the intake pipe, a throttle actuator for actuating the throttle valve and an injector for supplying fuel to the engine, the apparatus comprising:

• means, responsive to the demand output, for setting a target charged intake air amount of air taken into the cylinder per intake stroke;
• means, based on an air pressure generated at a downstream side of the throttle valve, for setting an actual charged intake air amount taken into the cylinder per intake stroke;
• means, responsive at least to the target and actual charged intake air amounts, for calculating, using a reverse chamber model, a throttle valve opening degree required for equalizing the target charged intake air amount and an actual charged intake air amount taken into the cylinder after an elapse of a minute period;
• and
• means for outputting a signal for actuating the throttle valve to the throttle actuator so that the throttle valve has the calculated opening degree.

A control apparatus of an engine for controlling a throttle valve opening degree in response to a demand output of a driver, the engine having at least one cylinder, an intake pipe connected to the cylinder, a throttle valve disposed in the intake pipe, a throttle actuator for actuating the throttle valve and an injector for supplying fuel to the engine, the apparatus comprising:

• means, responsive to the demand output, for setting a target charged intake air amount of air taken into the cylinder per intake stroke;
• means, based on an air pressure generated at a downstream side of the throttle valve, for setting an actual charged intake air amount taken into the cylinder per intake stroke;
• means, based on an air pressure generated at an upstream side of the throttle valve, for setting the maximum charged intake air amount as the maximum value of an actual charged intake air amount taken into the cylinder per intake stroke;
• means for setting the throttle valve opening degree based on an intake air ratio and an engine speed indicating value, the intake air ratio being a ratio of a mean value of the target charged intake air amount and the actual charged intake air amount to the maximum charged intake air amount, the engine speed indicating value being calculated by adding an engine speed and an increment or a decrement of the engine speed based on the target charged intake air amount and the actual charged intake air amount;
• and
• means for outputting a signal for actuating the throttle valve to the throttle actuator so that the throttle valve has the opening degree set by the throttle valve opening degree setting means.