US 6,549,839 B2 · Vehicle drive system

Abstract

A controller 10 calculates a target drive force based on an accelerator pedal operation amount and a vehicle speed. A speed ratio for calculating a target engine torque is calculated based on the state of the transmission 2. The target engine torque is calculated by dividing the target drive force with the speed ratio for calculating the target engine torque. The torque of the engine 1 is controlled so that the torque of the engine 1 coincides with the target engine torque. During reverse vehicle operation, the speed ratio for calculating target engine torque is corrected to a larger value. In this manner, it is possible to suppress the drive force during reverse vehicle operation while using almost all processes for calculating the target drive force in common during forward and reverse vehicle operation.

Claims6

Dependent claims

A vehicle drive system comprising:

an engine;
an automatic transmission connected to the engine;
a sensor which detects a running condition of the vehicle;
a sensor which detects an operational condition of the transmission;
and
a controller functioning to:
calculate a target drive force based on the running condition of the vehicle;
calculate a first value based on the state of the transmission;
set the first value as a speed ratio for calculating a target engine torque during forward vehicle operation;
set a second value calculated by correcting the first value to a larger value as the speed ratio for calculating the target engine torque during reverse vehicle running;
calculate the target engine torque by dividing the target drive force by the speed ratio for calculating the target engine torque;
and
control the engine so that the engine torque coincides with the target engine torque.

10 more elements

Dependencies are inferred from the claim text.

Vehicle drive system

Life of this patent

Vehicle drive system

Life of this patent

Abstract

Claims6