Abstract: An engine start control apparatus includes a motor/generator and a controller for controlling the motor/generator. The controller starts an engine cranking operation to start the engine by operating the motor/generator in a cranking mode for driving an engine in response to an engine start command signal, monitors an operating condition of the engine cranking operation to produce a mode change signal before an engine speed exceeds a target speed, and switches the motor/generator from the cranking mode to an overshoot control mode to control the power generation of the motor/generator in accordance with a predetermined target parameter such as a target power generation torque and a desired engine speed.

Abstract: An automatic engine stop and restart system includes an engine, a starting motor, a transmission, a vehicle operating condition sensor and a controller. The controller monitors the vehicle operating condition to produce an automatic engine restart request signal during an automatic engine stop operation, calculates a target engine speed for the automatic engine restart operation, and drives the motor in accordance with the target speed to perform the automatic engine restart operation in response to the engine restart request signal. During the automatic engine restart operation, the transmission is held in a drive state or in a non-drive state invariably.

Abstract: An automatic engine-stop control apparatus for a vehicle includes a vehicle speed sensor and a brake pedal depression sensor which are coupled to a control unit. The control unit is programmed to decide that the vehicle speed detected by the vehicle speed sensor is smaller than or equal to a predetermined stop expected speed when the brake pedal depression sensor detects that the brake pedal is depressed, and to decide that the vehicle is stopped when a predetermined time period elapses from a moment that the vehicle speed becomes smaller than or equal to the predetermined stop expected speed and when the depression of the brake pedal is continued.