Automatic transmission ratio change schedules based on a desired powertrain output专利检索-..大气温度专利检索查询-专利查询网

Automatic transmission ratio change schedules based on a desired powertrain output
申请号	GB0012421	申请日	2000-05-24	公开(公告)号	GB2353073B	公开(公告)日	2003-10-01
申请人	FORD GLOBAL TECH INC; FORD GLOBAL TECH LLC;			发明人	ROBICHAUX JERRY DEAN; PALLETT TOBIAS JOHN; WEBSTER GARY BRUCE;
摘要	A system and method for controlling a vehicular powertrain including an internal combustion engine, an automatic transmission having a plurality of selectable gear ratios, and a controller in communication with the internal combustion engine, the transmission, and an accelerator pedal, include determining a driver requested wheel torque based on position of the accelerator pedal, and determining a vehicle speed ratio changing threshold based on the driver requested wheel torque. In one embodiment, the system and method determine a value indicative of current barometric pressure, determine a current gear ratio, and modify the driver requested wheel torque based on the current barometric pressure and the current gear ratio to determine a compensated wheel torque. The compensated wheel torque is used to determining the ratio changing threshold. Offset values are included to adjust for barometric pressure variation, transmission oil temperature, and to prevent gear hunting or excessive ratio changing.
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