Speed-change control system for an automatic transmission

Details Speed-change control system for an automatic transmission Speed-change control system for an automatic transmission

1979-07-25

1981-08-25

Braun, Leslie

Machine element or mechanism

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

Preselected indexed position

74862, B60K 4104, B60K 4106

Patent

active

042852528

ABSTRACT:
A speed-change control system for an automatic transmission includes a vehicle speed sensor, an engine load sensor, speed change program memory circuits, a comparator for comparing signals from the sensors with signals from the memory circuit, and a speed change control circuit for producing a signal for changing the transmission into a determined speed position in response to an output from the comparator.
According to the invention the control system comprises a differentiation unit for differentiating the signal from the vehicle speed sensor to produce a signal corresponding to an actual acceleration, a programmed acceleration memory circuit for storing programmed accelerations obtained corresponding to the signals from the engine load sensor at every speed positions to produce signals corresponding to the programmed accelerations, and means for changing the speed change programs in response to differences between the signals corresponding to the actual acceleration and to the programmed acceleration, thereby automatically selecting a speed change program suitable for a grade of a road and a loaded condition without a troublesome hand operation of a switch for selecting a speed change program by a driver.

REFERENCES:
patent: 3662625 (1972-05-01), Wakamatsu et al.
patent: 3673400 (1972-06-01), Ito
patent: 3776048 (1973-12-01), Enomoto et al.
patent: 3826158 (1974-07-01), Flaig
patent: 3881368 (1975-05-01), Furuhashi et al.
patent: 3903759 (1975-09-01), Hashimoto
patent: 3938409 (1976-02-01), Uozumi
patent: 3956947 (1976-05-01), Leising et al.
patent: 4131036 (1978-12-01), Ivey et al.

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