System for shift control in automatic transmission

Details System for shift control in automatic transmission System for shift control in automatic transmission

1987-02-06

1989-06-13

Wright, Dirk

Machine element or mechanism

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

Preselected indexed position

3644241, B60K 4118

Patent

active

048381250

ABSTRACT:
In a system for shift control in an automatic transmission, wherein gear stages are automatically switched in accordance with a preset shift pattern, judgment is made as to whether or not a shifting was abnormal, and, if it is judged as abnormal, the shift pattern in the subsequent shifting is changed to a fail shift pattern, in which shift points are set slightly low. With this arrangement, the durability of frictionally engaging devices is secured.

REFERENCES:
patent: 4350057 (1982-09-01), Kishi et al.
patent: 4373619 (1983-02-01), Schritt et al.
patent: 4393732 (1983-07-01), Suzuki et al.
patent: 4414863 (1983-11-01), Heino
patent: 4495457 (1985-01-01), Stahl
patent: 4523281 (1985-06-01), Noda et al.
patent: 4583171 (1986-04-01), Hara et al.
patent: 4584906 (1986-04-01), Nagaoka et al.
patent: 4628772 (1986-12-01), Nishikawa et al.
patent: 4635508 (1987-01-01), Tatsumi
patent: 4653350 (1987-03-01), Downs et al.

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