Automatic mechanical transmission control

Details Automatic mechanical transmission control Automatic mechanical transmission control

1985-03-15

1987-10-06

Lall, Parshotam S.

Boots, shoes, and leggings

74866, 74877, B60K 4108

Patent

active

046987630

ABSTRACT:
An improved control system for an automatic change gear transmission (10) driven by a throttle (18) controlled engine (12) is provided. The control system includes a processing unit (30) for receiving inputs indicating at least throttle position (18), engine speed (20) and vehicle speed (28) and for processing these inputs in accordance with a program to determine the correct engaged gear ratio and for issuing command signals to a transmission shifting mechanism (26). The processing unit includes a program having a first mode of operation and a second mode of operation and is effective to operate in the second mode of operation after a shift until reset to the first mode of operation. The engine speeds (52, 48) at which downshifts and upshifts are commanded in the second mode of operation are modified from the normal engine speeds (42, 40) at which downshifts and upshifts are commanded in the first mode in accordance with the direction of the last shift. The improvement includes means response to a calculated expected engine speed (B) at the time of the last shift, and vehicle performance subsequent to the last shift, for resetting the program to the first mode thereof after a shift.

REFERENCES:
patent: 4274306 (1981-06-01), Yokoi et al.
patent: 4338666 (1982-07-01), Suzuki et al.
patent: 4361060 (1982-11-01), Smyth
patent: 4501171 (1985-02-01), Muller et al.
patent: 4551802 (1985-11-01), Smyth
patent: 4564906 (1986-01-01), Stephan et al.
patent: 4576065 (1986-03-01), Speranza et al.
patent: 4599917 (1986-06-01), Leornt et al.

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