ENGINE CONTROL APPARATUS

摘要

When a difference between a target intake air amount during the reduced-cylinder operation, which is greater than a target intake air amount during the all-cylinder operation in a normal state, and an actual intake air amount is greater than an allowable deficient intake air amount, a preparatory control for increasing the actual intake air amount and shifting an ignition timing toward a retard side with respect to an ignition timing during the all-cylinder operation in the normal state. Then, at a time when the difference between the target intake air amount and the actual intake air amount becomes equal to or less than the allowable deficient intake air amount, the reduced-cylinder operation is started, wherein the allowable deficient intake air amount is set to a larger value when a current speed stage is a high speed stage than when it is a low speed stage.

主权项

1. An engine control apparatus for controlling an engine mounted on a vehicle body, wherein the engine has a plurality of cylinders and is switchable between an all-cylinder operation in which combustion of an air-fuel mixture is performed in all of the cylinders and a reduced-cylinder operation in which the combustion in a specific part of the cylinders is stopped, the engine control apparatus comprising:
an ignition device provided in each of the cylinders to ignite an air-fuel mixture in the cylinder, an intake air amount changing device capable of changing an intake air amount which is an amount of air to be taken into each of the cylinders; and a control device for controlling a plurality of target devices of the engine including the ignition device and the intake air amount changing device, wherein the control device is operable, upon issuance of a switching demand for switching from the all-cylinder operation to the reduced-cylinder operation, to set a target value of the intake air amount to a transient value which is greater than a target value of the intake air amount during the all-cylinder operation in a normal state in which there is no switching demand, and, when a difference between the transient target intake air amount and an actual intake air amount is greater than an allowable deficient intake air amount, to execute, before starting the reduced-cylinder operation, a preparatory control for increasing the actual intake air amount by the intake air amount changing device, and shifting an ignition timing of the ignition device toward a retard side with respect to an ignition timing during the all-cylinder operation in the normal state so as to cancel out a fluctuation in engine torque which would otherwise be caused by the increase in the actual intake air amount, and then start the reduced-cylinder operation at a time when the difference between the transient target intake air amount and the actual intake air amount becomes equal to or less than the allowable deficient intake air amount, and wherein the allowable deficient intake air amount is set to a larger value when a current speed stage of a vehicle transmission is a high speed stage than when it is a low speed stage.