Adjusting clutch slip based on sensed parameter of transmission shaft to control NVH level in vehicle powertrain
First Claim
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1. A method for a powertrain having a transmission and a clutch, comprising:
- obtaining a NVH level in the powertrain based on a magnitude of a sensed parameter of a shaft of the transmission from a database having respective NVH level and parameter magnitude pairs;
obtaining a clutch slip target corresponding to a desired NVH level from a database having respective clutch slip and desired NVH level pairs;
adjusting slip of the clutch to the target.
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Abstract
A vehicle powertrain includes a transmission and a clutch. The slip of the clutch is adjusted to a target where a magnitude of a sensed parameter of a shaft of the transmission corresponds to a desired noise, vibration, and harshness (NVH) level in the powertrain. The sensed parameter of the transmission shaft may be one of acceleration, speed, and torque of the transmission shaft. The transmission shaft may be one of the input shaft and output shaft of the transmission.
34 Citations
14 Claims
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1. A method for a powertrain having a transmission and a clutch, comprising:
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obtaining a NVH level in the powertrain based on a magnitude of a sensed parameter of a shaft of the transmission from a database having respective NVH level and parameter magnitude pairs; obtaining a clutch slip target corresponding to a desired NVH level from a database having respective clutch slip and desired NVH level pairs; adjusting slip of the clutch to the target. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for a powertrain having a transmission and a clutch, the system comprising:
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a sensor for sensing a parameter of a shaft of the transmission; a database having a respective noise, vibration, and harshness (NVH) level indication for each of a plurality of magnitudes of the parameter of the transmission shaft, the database further having a respective clutch slip target for each of a plurality of desired NVH levels; and a controller in communication with the sensor and the database and configured to obtain from the database an indication of the NVH level in the powertrain based on a magnitude of the sensed parameter of the transmission shaft, obtain from the database the clutch slip target corresponding to a selected desired NVH level, and adjust slip of the clutch to the target in which a magnitude of the sensed parameter of the transmission shaft corresponds to the selected desired NVH level in the powertrain. - View Dependent Claims (9, 10)
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11. A vehicle comprising:
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a powertrain having a transmission and a clutch; a sensor for sensing a parameter of a shaft of the transmission; a database having a respective noise, vibration, and harshness (NVH) level indication for each of a plurality of magnitudes of the parameter of the transmission shaft, the database further having a respective clutch slip target for each of a plurality of desired NVH levels; and a controller configured to obtain from the database an indication of the NVH level in the powertrain based on a magnitude of the sensed parameter of the transmission shaft, obtain from the database the clutch slip target corresponding to a selected desired NVH level, and adjust slip of the clutch to the target in which a magnitude of a sensed parameter of the shaft of the transmission corresponds to the selected desired NVH level in the powertrain. - View Dependent Claims (12, 13, 14)
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Specification