Shift control system for an automatic transmission
First Claim
1. A shift control system for an automatic transmission, comprising:
- a torque converter;
a multiple stage gear mechanism for performing a shift by shifting an operational state of a friction coupling element of a hydraulic pressure type, which is coupled to the torque converter;
a shift control means for controlling operation of the friction coupling element on the basis of a predetermined shift characteristic;
a temperature detecting means for detecting a temperature of an operating oil for the torque converter and the friction coupling element; and
a shift characteristic shifting means for shifting the shift characteristic so as to make a range of driving at least at a first speed stage narrow during a cold time period when the temperature of the operating oil detected by the temperature detecting means is equal to or lower than a predetermined value.
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Accused Products
Abstract
A shift control system for the vehicle contains a torqueconverter, a multiple stage gear mechanism adapted for a shift of an operating state of a friction coupling means of a hydraulic pressure type which is coupled to the torque converter, a temperature sensor for sensing temperatures of the operating oil for the torque converter and the friction coupling element, and a control unit for shift control. The control unit controls operation of the friction coupling elements on the basis of a predetermined shift characteristic and shifts the shift characteristic, when the temperature of the operating oil to be sensed by the temperature sensor is lower than a given value, is in such a manner that the area of driving at least for first speed stage is narrowed.
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Citations
25 Claims
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1. A shift control system for an automatic transmission, comprising:
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a torque converter; a multiple stage gear mechanism for performing a shift by shifting an operational state of a friction coupling element of a hydraulic pressure type, which is coupled to the torque converter; a shift control means for controlling operation of the friction coupling element on the basis of a predetermined shift characteristic; a temperature detecting means for detecting a temperature of an operating oil for the torque converter and the friction coupling element; and a shift characteristic shifting means for shifting the shift characteristic so as to make a range of driving at least at a first speed stage narrow during a cold time period when the temperature of the operating oil detected by the temperature detecting means is equal to or lower than a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification