Patent ID: 6640179
Filing Date: 2003-10-28
Classification: B60W,F16H,Y10T

Abstract:
A vehicle drive system, comprising:an accelerator pedal; a sensor which detects a vehicle speed; a sensor which detects a depression amount of the accelerator pedal; an engine varying an output torque in response to a signal; an automatic transmission converting the output torque of the engine into a drive torque of a vehicle, the transmission being provided with a first gear and a second gear which has a smaller speed reduction ratio than the first gear, the first gear and second gear being selectively applied according to the depression amount and the vehicle speed; a sensor which detects the gear applied by the automatic transmission; and a programmable controller programmed to: store a first map prescribing a transmission target output torque with the first gear according to the depression amount and the vehicle speed, and a second map prescribing the transmission target output torque with the second gear according to the depression amount and the vehicle speed, the transmission target output torque prescribed by the first map being larger than the transmission target output torque prescribed by the second map with respect to the same vehicle speed and the same depression amount; calculate the transmission target output torque based on the vehicle speed and the depression amount by looking up either of the first map and second map corresponding to the gear which is applied by the automatic transmission; calculate an engine target output torque based on the transmission target output torque; and output the signal corresponding to the engine target output torque to the engine.