Apparatus for controlling gear shifts in automatic transmissions

Details Apparatus for controlling gear shifts in automatic transmissions Apparatus for controlling gear shifts in automatic transmissions

1978-08-09

1981-03-31

Braun, Leslie

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74867, 74870, 74871, B60K 4106, B60K 4108

Patent

active

042585910

ABSTRACT:
To improve vehicle operator comfort and safety and to reduce wear and tear on the automatic transmission, the apparatus prevents an upshift whenever the accelerator pedal is released very quickly. The apparatus stores the load signal which prevailed when the load was abruptly reduced, thereby simulating to the transmission controller a continuation of high load and preventing an undesired upshift, for example in downhill operation and during roll-outs. Normal load signals are restored whenever the accelerator pedal is returned to a predetermined point. In one embodiment, the stored load signal is a hydraulic pressure and in another embodiment, for use with an electronic transmission controller, the load signal is an electrical signal. In a third embodiment, the upshift control signal from the controller to the transmission is interrupted when the apparatus indicates a complete release of the accelerator pedal.

REFERENCES:
patent: 2692511 (1954-10-01), Nallinger
patent: 2719436 (1955-10-01), Nallinger
patent: 3398607 (1968-08-01), Chana
patent: 3405575 (1968-10-01), Searles et al.
patent: 3702572 (1972-11-01), Wakamatsu et al.
patent: 3713351 (1973-01-01), Sakakibara
patent: 3732754 (1973-05-01), Mori
patent: 3756358 (1973-09-01), Espenschied et al.
patent: 3776048 (1973-12-01), Enomoto et al.
patent: 3958466 (1976-05-01), Espenschied
patent: 4026169 (1977-05-01), Kuhnle et al.
patent: 4041810 (1977-08-01), Harmon et al.
patent: 4073203 (1978-02-01), Wurst et al.

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