Method for controlling an engine that may be automatically stopped
First Claim
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1. A method for starting an engine coupled to a transmission, comprising:
- stopping said engine;
applying a tie-up force to said transmission during said engine stop and maintaining the tie-up during engine shutdown; and
reducing said tie-up force in response to an amount of torque transmitted to said transmission via a torque converter, an amount of force applied by a vehicle brake, and timing of a combustion event.
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Abstract
A method for improving starting of an engine that may be repeatedly stopped and started is presented. In one embodiment, the method adjusts a transmission tie-up force in response to engine starting. The method may improve vehicle launch for stop/start vehicles.
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Citations
20 Claims
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1. A method for starting an engine coupled to a transmission, comprising:
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stopping said engine; applying a tie-up force to said transmission during said engine stop and maintaining the tie-up during engine shutdown; and reducing said tie-up force in response to an amount of torque transmitted to said transmission via a torque converter, an amount of force applied by a vehicle brake, and timing of a combustion event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for starting an engine coupled to a transmission, comprising:
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stopping said engine; tying up said transmission during said engine stop; and during an engine start after stopping said engine, reducing a tie-up force applied to said transmission in response to an operator input, vehicle brake force, and a first combustion event of the start. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for starting an engine coupled to a transmission, comprising:
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stopping said engine; applying a tie-up force to said transmission during said engine stop by applying clutches of multiple gears of the transmission; restarting said engine in response to an operating condition, said operating condition other than an operator input; and reducing said tie-up force when a transmission input torque exceeds a threshold torque, said threshold torque decreasing as a force applied to a vehicle brake increases. - View Dependent Claims (18, 19, 20)
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Specification