Engine control to reduce impacts due to transmission gear lash while maintaining high responsiveness to the driver
First Claim
1. A vehicle control method for a vehicle having an internal combustion engine coupled to a torque converter, the torque converter having a speed ratio from torque converter output speed to torque converter input speed, the torque converter coupled to a transmission, the method comprising:
- selecting a rate of change limit based at least on both a driver request and a speed ratio across said torque converter input and output speeds; and
adjusting an operating parameter to control a change in an engine output to be less than said rate of change limit during preselected operating conditions.
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Accused Products
Abstract
An engine control system controls engine torque to transition through the transmission and driveline'"'"'s lash zone. The transmission and driveline'"'"'s lash zone is indicated using information of the speed ratio across the torque converter. This information is then supplemented with information of the driver'"'"'s request and vehicle speed so that engine torque is adjusted at various predetermined rates based on current operating conditions. As such, the system can reduce undesired drive feel that otherwise may occur as the system passes through the transmission and driveline'"'"'s lash zone. By limiting the change of torque in this way, driveability, while at the same time maintaining acceptable performance response.
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Citations
17 Claims
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1. A vehicle control method for a vehicle having an internal combustion engine coupled to a torque converter, the torque converter having a speed ratio from torque converter output speed to torque converter input speed, the torque converter coupled to a transmission, the method comprising:
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selecting a rate of change limit based at least on both a driver request and a speed ratio across said torque converter input and output speeds; and
adjusting an operating parameter to control a change in an engine output to be less than said rate of change limit during preselected operating conditions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A vehicle control method for a vehicle having an internal combustion engine coupled to a torque converter, the torque converter having a speed ratio from torque converter output speed to torque converter input speed, the torque converter coupled to a transmission, the method comprising:
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selecting a rate of change limit based at least on a driver request, a speed ratio across said torque converter input and output speeds, and vehicle speed; and
adjusting an operating parameter to control a change in an engine output to be less than said rate of change limit during preselected operating conditions. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification