Control device for an automatic transmission system
A control device for an automatic transmission having a main transmission, a sub transmission connected to an output shaft of the main transmission, and electronic control means for controlling the speed changing ratios of the main and sub transmissions is described. The electronic control means consists of: means for inputting a signal representing a running state of a vehicle and controlling the speed changing ratios of the main and sub transmissions; speed changing ratio detecting means for detecting the speed changing ratio of the sub transmission; first output shaft speed detecting means for detecting the rotational speed of the output shaft of the main transmission; second output shaft speed detecting means for detecting the rotational speed of the output shaft of the sub transmission; means for adjusting a signal of the second output shaft speed detecting means when the speed changing ratio detecting means judges that the speed changing ration of the sub transmission is in a reduced speed range; and means for effecting speed change control of the main transmission by selecting either a signal of the first output shaft speed detecting means and the signal of the second output shaft speed detecting means as a result of comparison between the signal of the first output shaft speed detecting means and the signal of the second output shaft speed detecting means.
- Assignee:
- Toyota Jidosha Kabushiki Kaisha and Aisin-Warner Kabushiki Kaisha, Aichi
- Patent Number(s):
- US 4693143
- OSTI ID:
- 5980510
- Resource Relation:
- Patent File Date: Filed date 21 Jan 1986
- Country of Publication:
- United States
- Language:
- English
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