Speed change ratio controller for continuously variable transmis

Details Speed change ratio controller for continuously variable transmis Speed change ratio controller for continuously variable transmis

1998-04-08

2000-04-25

Nguyen, Tan

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

B60K 4104

Patent

active

060554746

ABSTRACT:
A target speed change ratio of a continuously variable transmission of a vehicle is set according to the running state of the vehicle. Dynamic characteristics of the continuously variable transmission are estimated for each speed change ratio, and a speed change ratio output value is calculated based on the dynamic characteristics. An external disturbance compensating value is computed from a speed change ratio command value, the real speed change ratio, the dynamic characteristic estimated value and a predetermined time constant, and the transmission is controlled by the speed change ratio command value based on the speed change ratio output value and external disturbance compensating value. By applying the lesser of a temporary target speed change ratio having predetermined characteristics and the target speed change ratio to the calculation of the speed change ratio output value when the vehicle speed is equal to or greater than a predetermined value, a dimensional error in parts is compensated and smooth speed change control is realized when the vehicle starts.

REFERENCES:
patent: 4683779 (1987-08-01), Osanai et al.
patent: 4778435 (1988-10-01), Sugaya et al.
patent: 5628705 (1997-05-01), Kashiwabara

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