Control system for stopping and starting vehicle engine

An engine stop and start control system for a vehicle, wherein the vehicle comprises:

• an engine as a power source for driving the vehicle;
• a transmission for transmitting power produced by the engine to an output shaft of the vehicle;
• and
• a mechanical oil pump, operated by the power produced by the engine, for supplying oil pressure to the transmission, and
• the control system comprises:
• an automatic engine stopping and starting section automatically stopping the engine under predetermined stopping conditions, automatically starting the engine under predetermined starting conditions, and restarting the engine when one of a driving voltage and a duty ratio in pulse width modulation of a driving motor for driving an electric oil pump is equal to or greater than a predetermined value while the engine is automatically stopped, wherein
• the electric oil pump is operated when the predetermined stopping conditions are satisfied, so as to supply the oil pressure to the transmission via an oil pressure supply section, where one of the driving voltage and the duty ratio is controlled in a manner such that one of a line pressure, which is the oil pressure in the oil pressure supply section, and a value of current flowing through the driving motor coincides with a predetermined command value.

An engine stop and start control system for a vehicle, wherein the vehicle comprises:

• an engine as a power source for driving the vehicle;
• a transmission for transmitting power produced by the engine to an output shaft of the vehicle;
• and
• a mechanical oil pump, operated by the power produced by the engine, for supplying oil pressure to the transmission, and
• the control system comprises:
• an automatic engine stopping and starting section automatically stopping the engine under predetermined stopping conditions, automatically starting the engine under predetermined starting conditions, and prohibiting the automatic engine stop when a slip ratio of a clutch for a gear for starting the vehicle in the transmission exceeds a predetermined range in a predetermined time after the engine is restarted from the state in which the engine is automatically stopped;
• and
• an electric oil pump operated when the predetermined stopping conditions are satisfied, so as to supply the oil pressure to the transmission.