Adjusting clutch slip based on sensed parameter of transmission shaft to control vehicle NVH
First Claim
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1. A method for a powertrain having a transmission and a clutch, comprising:
- identifying a torque of a shaft of the transmission corresponding to a specified noise, vibration, and harshness (NVH) level in the powertrain;
obtaining a target of a slip of the clutch corresponding to the specified NVH level in the powertrain from a database having corresponding clutch slip target and specified level of NVH pairs;
sensing the torque of the shaft using a sensor in communication with the shaft; and
adjusting the slip of the clutch to the clutch slip target to change the torque of the shaft until the torque of the shaft as sensed matches the identified torque such that an amount of NVH in the powertrain based on the torque of the shaft corresponds to the specified NVH level.
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Abstract
A vehicle powertrain includes a transmission and a clutch. The slip of the clutch is adjusted to a predefined target where a sensed parameter of a shaft of the transmission corresponds to a specified 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.
32 Citations
13 Claims
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1. A method for a powertrain having a transmission and a clutch, comprising:
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identifying a torque of a shaft of the transmission corresponding to a specified noise, vibration, and harshness (NVH) level in the powertrain; obtaining a target of a slip of the clutch corresponding to the specified NVH level in the powertrain from a database having corresponding clutch slip target and specified level of NVH pairs; sensing the torque of the shaft using a sensor in communication with the shaft; and adjusting the slip of the clutch to the clutch slip target to change the torque of the shaft until the torque of the shaft as sensed matches the identified torque such that an amount of NVH in the powertrain based on the torque of the shaft corresponds to the specified NVH level. - View Dependent Claims (2, 3, 4, 5)
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6. A method for a powertrain having a transmission and a clutch, the method comprising:
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identifying a specified noise, vibration, and harshness (NVH) level for the powertrain based on an operating condition of the powertrain; identifying a torque of a shaft of the transmission corresponding to the specified NVH level for the powertrain; obtaining a target of a slip of the clutch corresponding to the specified NVH level in the powertrain from a database having corresponding clutch slip target and specified level of NVH pairs; sensing the torque of the shaft using a sensor in communication with the shaft; detecting an amount of NVH in the powertrain based on the torque of the shaft; and adjusting the slip of the clutch to the clutch slip target to change the torque of the shaft until the torque of the shaft as sensed matches the identified torque so that the detected amount of NVH in the powertrain matches the specified level of NVH for the powertrain. - View Dependent Claims (7, 8, 9)
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10. A method for a powertrain having a transmission and a clutch, comprising:
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identifying a parameter of shaft of the transmission corresponding to a specified NVH level in the powertrain; obtaining a clutch slip target corresponding to the specified NVH level;
from a database having corresponding clutch slip target and NVH level pairsadjusting clutch slip to the target to change the parameter of the shaft until the parameter as sensed matches the identified parameter. - View Dependent Claims (11, 12, 13)
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Specification