Speed ratio controller and control method of automatic transmiss

Details Speed ratio controller and control method of automatic transmiss Speed ratio controller and control method of automatic transmiss

1999-07-22

2000-10-24

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

Control by sensed ambient condition, pattern indicia,...

F16H 6100, F16H 1500, F16H 900

Patent

active

061359173

ABSTRACT:
A speed ratio controller for a continuously variable transmission comprises a sensor (66) for detecting the activation of a catalyst purifying the exhaust gas of the engine, a sensor (62) for detecting an engine load, a sensor (63) for detecting a vehicle speed and a microprocessor (61) for controlling the transmission. The microprocessor (61) stores a first speed change map defining a speed ratio of the transmission according to the vehicle speed and engine load, and a second speed change map defining a larger speed ratio than the speed ratio defined in the first speed change map in a range where the vehicle speed is lower than a predetermined vehicle speed and the engine load is lower than a predetermined engine load. In order to determine the speed ratio of the transmission, the microprocessor (61) applies the first speed change map until the catalyst is activated and the second speed change map after the catalyst is activated.

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