摘要:
A system and method for controlling an operation of an internal combustion engine of a vehicle having an automatic transmission in which at least one of predetermined fuel supply recovery engine revolution speed or predetermined fuel supply cut-off engine revolution speed is varied during the engine deceleration condition according to a state of operation of the automatic transmission. In the first preferred embodiment, a downshift operation of the automatic transmission is detected. In the second preferred embodiment, an overrun clutch solenoid is turned on (energized). In the latter case, both fuel supply recovery and fuel supply cut-off engine revolution speeds are set to higher values than those when the clutch solenoid is turned off (deenergized).
摘要:
A hydraulic pressure, i.e., a line pressure, of a hydraulic fluid supplied from an engine driven pump toward a hydraulically actuable coupling of an automatic transmission is held at the maximum pressure value when a temperature of an automatic transmission oil is less than a predetermined temperature value. However, the hydraulic pressure is temporarily decreased from the maximum pressure value to the minimum pressure value for a period of time after cranking of the engine when the transmission oil temperature is lower than the predetermined temperature value. Owing to a decreased load on the engine by the oil pump, smooth cranking and subsequent warming-up operation of the engine is assured under cold whether condition when the automatic transmission oil temperature is lower than the predetermined temperature value.
摘要:
The outputs of one or more the sensors involved in the control of the transmission line pressure level are monitored. In the event that one of the same exhibits characteristics indicative that it is malfunctioning, a self-update function which modifies the line pressure level based on the length of a shift time is inhibited in order to prevent the line pressure being adjusted in a totally erroneous manner.
摘要:
A line pressure control arrangement includes a self-adjust function which prevents the updating of the line pressure control during no-load shifts or uses different target times for no-load (power off) and positive load (power on) shifts.