System for shift control in automatic transmission
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsYukio Hamano, Hideo Tomomatsu, Fumiaki Izumi, Yutaka Taga
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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.
Claims26
A system for shift control in an automatic transmission, wherein gear stages are automatically switched in accordance with a preset shift pattern, comprising:
- means for determining whether detected shifting data deviates from predetermined shifting data thereby determining whether a shifting was abnormal;
- and
- means for changing said shift pattern in the subsequent shifting to a fail shift pattern, wherein shift points are set slightly lower when said shifting was determined abnormal.
A system for shift control in an automatic transmission, wherein gear stages are automatically switched in accordance with a preset shift pattern, comprising:
- means for determining whether detected shifting data deviates from predetermined shifting data thereby determining whether a shifting was abnormal;
- means for restricting a performing region of the subsequent upshift when said shifting was determined abnormal.
Dependencies are inferred from the claim text.