System for controlling automatic variable speed transmission

Details System for controlling automatic variable speed transmission System for controlling automatic variable speed transmission

1987-03-17

1989-05-09

Lall, Parshotam S.

Boots, shoes, and leggings

74866, 192 4A, G06F 1520, B60K 4108, B60K 4126

Patent

active

048294357

ABSTRACT:
A control system for an automatic variable speed transmission accesses reference data for a down/up shift operation stored in a memory as a function of a particular speed range and a throttle opening. The data read from the memory is compared against a prevailing vehicle speed to determine the need for a down/up shift operation. The reference data includes a first set which is used for determining the need for a down/up shift operation, and a second set which is used in determining the need for a down shift operation when a rapid braking action is applied. When a brake pedal is depressed and the deceleration of the vehicle exceeds a given value, the need for a down operation is determined only utilizing the second set until the brake pedal is released, thus allowing the transmission to shift down to a lower speed range at a relatively higher vehicle speed.

REFERENCES:
patent: 4314340 (1982-02-01), Miki et al.
patent: 4335428 (1982-06-01), Miki et al.
patent: 4354236 (1982-10-01), Miki et al.
patent: 4365526 (1982-12-01), Suga et al.
patent: 4473882 (1984-09-01), Suzuki et al.

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