System for controlling a continuously variable transmission in r

Details System for controlling a continuously variable transmission in r System for controlling a continuously variable transmission in r

1995-01-27

1996-12-24

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

477904, 192 4A, B60K 4112

Patent

active

055869530

ABSTRACT:
In order to improve steering performance and braking performance specifically on a low .mu. road surface during operation of engine braking, there are provided, in a shift control system of a continuously variable transmission, a sensor for determining a wheel deceleration, and a shift controller for changing a shift pattern adequately. When an engine brake range such as a 2 range or an L range is selected, and the wheel deceleration becomes greater than a predetermined deceleration level, the shift controller changes an upshift limit of the engine brake range, to a smaller transmission ratio. By reducing the transmission ratio in this way, the shift control system can reduce an engine braking force applied to the drive wheels and an inertia torque of the transmission against the driving force applied to the drive wheels by the road surface, so that the wheel speed can readily increase to achieve a desirable degree of wheel slip.

REFERENCES:
patent: 3762231 (1973-10-01), Pettigren
patent: 4665775 (1987-05-01), Nagamatsu et al.
patent: 4696380 (1987-09-01), Kita
patent: 4735113 (1988-04-01), Yamamuro et al.
patent: 4784021 (1988-11-01), Morimoto
patent: 4916982 (1990-04-01), Suzuki
patent: 5067372 (1991-11-01), Suzuki
patent: 5069086 (1991-12-01), Murano et al.
patent: 5109962 (1992-05-01), Sato
patent: 5240094 (1993-08-01), Suzuki
patent: 5249482 (1993-10-01), Okahara et al.

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