Control systems for automatic transmissions
This patent describes a control system for an automatic transmission employed in a vehicle comprising: a torque converter coupled with an output shaft of an engine, a power transmitting gear arrangement disposed at an output end of the torque converter, speed change means for changing over power transmitting paths to one from another in the power transmitting gear arrangement to give rise to speed change, a valve arrangement for controlling an operation fluid to be supplied to and drained from the speed change means, revolving speed sensing means for detecting the revolving speed of one of input and output portions of the power transmitting gear arrangement when the shifting-down to a low speed with which an engine brake effect is to be obtained from a high speed in the power transmitting gear arrangement is carried out; and control means for selecting directly a first low speed with which the engine brake effect can be obtained as the low speed of a target of the shifting-down when the revolving speed detected by the revolving speed.
- Assignee:
- Mazda Motor Corp.
- Patent Number(s):
- US 4787258
- OSTI ID:
- 6363827
- Country of Publication:
- United States
- Language:
- English
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