Control system of vehicle having continuously variable transmiss

Details Control system of vehicle having continuously variable transmiss Control system of vehicle having continuously variable transmiss

1999-04-12

2000-05-23

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

477 48, 477906, F16H 900, B60K 4112

Patent

active

060660708

ABSTRACT:
A control system controls the output of a power source of a vehicle having a continuously variable transmission and a gear ratio to be set by the continuously variable transmission. The control system determines a target driving force on the basis of an output demand and a vehicle speed, and determines a target output of the power source for achieving the target driving force. The control system determines a target output speed preset for the target output, and controls the gear ratio of the continuously variable transmission so that the actual output speed of the power source may become the target output speed. The control system further determines the target output torque of the power source on the basis of the target output and the actual output speed of the power source, and controls the power source to achieve the target output torque. When the gear ratio is to be changed, its changing rate is made different in at least two quick and slow states. Moreover, the target output speed is provided with an upper limit, which is changed.

REFERENCES:
patent: 5803862 (1998-09-01), Ochiai et al.
patent: 5944626 (1999-08-01), Spiess et al.
Takeshi Takiyama, et al., "Simultaneous Control for Optimization of Fuel Consumption and Sensitivity of an Accelerator Pedal by Engine-CVT Consolidated Control," Transactions of The Japan Society of Mechanical Engineers, vol. 62, No. 593, (Jan. 1996), pp. 386-391.

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