Shift control apparatus for automatic transmission for vehicle
First Claim
1. In a shift control apparatus of an automatic transmission for a vehicle connected to a prime mover, having at least one frictional engaging element and hydraulic pressure control means for controlling hydraulic pressure supplied to said frictional engaging element, achieving a predetermined speed ratio by engaging said frictional engaging element, said shift control apparatus comprising:
- shift detection means for detecting that the speed ratio of the automatic transmission for the vehicle is changed over from a neutral position to the predetermined speed ratio;
engine stop condition determination means for determining a standstill condition of the prime mover over an extended period of time;
engine start detection means for detecting a start of the prime mover; and
correction means for correcting said hydraulic pressure control means to correct the hydraulic pressure supplied to said frictional engaging element to a higher-pressure side only when a long standstill condition of the prime mover is determined and a speed shift from the neutral position to the predetermined speed ratio is first selected.
2 Assignments
0 Petitions
Accused Products
Abstract
Hydraulic pressure supplied to the frictional engaging element of an automotive transmission is corrected to a higher value in the event that the engine is started after a long standstill condition and the first speed ratio is selected, thereby reducing speed-shift shocks when the engine is started from a standstill condition and the first speed ratio is selected.
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Citations
5 Claims
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1. In a shift control apparatus of an automatic transmission for a vehicle connected to a prime mover, having at least one frictional engaging element and hydraulic pressure control means for controlling hydraulic pressure supplied to said frictional engaging element, achieving a predetermined speed ratio by engaging said frictional engaging element, said shift control apparatus comprising:
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shift detection means for detecting that the speed ratio of the automatic transmission for the vehicle is changed over from a neutral position to the predetermined speed ratio; engine stop condition determination means for determining a standstill condition of the prime mover over an extended period of time; engine start detection means for detecting a start of the prime mover; and correction means for correcting said hydraulic pressure control means to correct the hydraulic pressure supplied to said frictional engaging element to a higher-pressure side only when a long standstill condition of the prime mover is determined and a speed shift from the neutral position to the predetermined speed ratio is first selected. - View Dependent Claims (2, 3, 4, 5)
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Specification