Engine control apparatus

Abstract

An engine control apparatus is provided for a hybrid vehicle that installs an engine and a motor as driving power sources for driving wheels as well as an automatic transmission such as CVT. The engine control apparatus basically operates to enable automatic stop and restart of the engine in response to drive conditions of the vehicle. In addition, the engine control apparatus cuts off fuel supply to the engine at a deceleration mode of the vehicle. At a deceleration mode of the vehicle under execution of fuel cut, the engine control apparatus maintains idle rotation of the engine by operating the motor to rotate in response to engine speed until the automatic transmission is returned to a restart-enable reduction ratio (e.g., 2.2 to 2.45). That is, the engine control apparatus allows execution of an engine stop after securing a restart-enable state of the automatic transmission. Incidentally, the motor produces motor torque, which is increased in response to decrease of the engine speed in a range between 700 and 1000 rpm, then, which is maintained at a prescribed value (e.g., 8.5 kgf-m), for example.

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