Methods and system for transitioning between control modes while creeping
First Claim
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1. A driveline method, comprising:
- operating a torque source in a speed control mode during a vehicle creep mode while a clutch of a torque converter is open;
transitioning operating the torque source from the speed control mode to a torque control mode and locking the clutch during the vehicle creep mode in response to a vehicle operating condition; and
adjusting torque of the torque source in response to torque converter impeller speed when the torque converter clutch is unlocked.
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Abstract
Systems and methods for transitioning a torque source between speed control and torque control modes during a vehicle creep mode are disclosed. In one example, torque of an electric machine is adjusted in response to a torque converter model. The torque converter model provides for a locked or unlocked torque converter clutch.
13 Citations
10 Claims
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1. A driveline method, comprising:
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operating a torque source in a speed control mode during a vehicle creep mode while a clutch of a torque converter is open; transitioning operating the torque source from the speed control mode to a torque control mode and locking the clutch during the vehicle creep mode in response to a vehicle operating condition; and adjusting torque of the torque source in response to torque converter impeller speed when the torque converter clutch is unlocked. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A driveline method, comprising:
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operating a torque source in a speed control mode during a vehicle creep mode while a clutch of a torque converter is open; transitioning operating the torque source from the speed control mode to a torque control mode and locking the clutch during the vehicle creep mode in response to a vehicle operating condition; and adjusting torque of the torque source in response to a virtual torque converter impeller speed when the torque converter clutch is locked. - View Dependent Claims (8, 9)
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10. A driveline method, comprising:
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operating a torque source in a speed control mode during a vehicle creep mode while a clutch of a torque converter is open; transitioning operating the torque source from the speed control mode to a torque control mode and locking the clutch during the vehicle creep mode in response to a vehicle operating condition; and adjusting torque of the torque source in the torque control mode in response to a filtered torque, where the filtered torque is based on a torque when the torque source is operated in the speed control mode.
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Specification