Device and method for accurately controlling automatic transmiss

Details Device and method for accurately controlling automatic transmiss Device and method for accurately controlling automatic transmiss

1982-04-05

1985-01-22

Gruber, Felix D.

Boots, shoes, and leggings

74752D, 74866, 74867, 192 009, 192 328, B60K 4108, B60K 4122, G06F 1520

Patent

active

044955766

ABSTRACT:
A vehicle transmission includes a gear transmission mechanism and a torque converter with a lock up clutch, both hydraulically activated. The transmission control device practices the method, and includes an electronic computer which inputs data representing operational parameters of the vehicle and outputs transmission speed stage command signals and lock up clutch command signals, and a hydraulic control system controlled by the computer which according to these signals controls the lock up clutch to be engaged or disengaged and the transmission to be set to its various speed stages. Sometimes the lock up clutch is engaged just before the computer changes the speed stage of the transmission, and in this case the lock up clutch is disengaged by the computer during a time period overlapping the time period taken for the change of speed stage, with the time instant of commencement of dispatch of lock up clutch disengage signals from the computer to initiate the disengagement of the lock up clutch being displaced in time from the time instant of dispatch of speed stage change signals from the computer to initiate the change of speed stage. Particularly, the time displacement may be forward in the case of an upshift, and backward in the case of a downshift.

REFERENCES:
patent: 4155277 (1979-05-01), Minami et al.
patent: 4373619 (1983-02-01), Schritt et al.
patent: 4393467 (1983-07-01), Miki et al.
patent: 4411174 (1983-10-01), Yokoi et al.
patent: 4414863 (1983-11-01), Heino
patent: 4417303 (1983-11-01), Kubo et al.

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