Adaptive torsional damping device for a continuously variable transmission
First Claim
1. A clutch control system for a continuously variable transmission having a torque input means, a torque output means, a belt and sheave system and a slippable start clutch means for transmitting torque to said belt and sheave system, said slippable start clutch means being operatively located between said torque input means and said belt and sheave system, said control system comprising:
- means for providing a first value representative of a limiting value of torsional vibrations transmitted to said belt and sheave system;
means for providing a first signal representative of actual torsional vibrations transmitted to said belt and sheave system;
means for comparing said first signal with said first value;
clutch slip feedback means for providing a second signal representative of the actual slip across said start clutch; and
clutch adjustment means for modifying slip across said slippable start clutch means in an incremental amount, said clutch adjustment means responsive to said comparing means and said clutch slip feedback means to reduce torsional vibrations.
1 Assignment
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Accused Products
Abstract
An adaptive control system controls the slip across a start clutch located up-stream of a continuously variable transmission to allow the clutch to be use as a torsional isolator in a continuously variable transmission. The system includes a torsional vibration detector for determining the actual level of torsional vibrations transmitted by the clutch. The actual level of vibrations is compared with an acceptable level and the slip across the clutch is regulated in order to maintain the transmission of vibrations to the acceptable level.
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Citations
11 Claims
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1. A clutch control system for a continuously variable transmission having a torque input means, a torque output means, a belt and sheave system and a slippable start clutch means for transmitting torque to said belt and sheave system, said slippable start clutch means being operatively located between said torque input means and said belt and sheave system, said control system comprising:
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means for providing a first value representative of a limiting value of torsional vibrations transmitted to said belt and sheave system; means for providing a first signal representative of actual torsional vibrations transmitted to said belt and sheave system; means for comparing said first signal with said first value; clutch slip feedback means for providing a second signal representative of the actual slip across said start clutch; and clutch adjustment means for modifying slip across said slippable start clutch means in an incremental amount, said clutch adjustment means responsive to said comparing means and said clutch slip feedback means to reduce torsional vibrations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A clutch control system for a continuously variable transmission having a torque input means, a torque output means, a belt and sheave system and a slippage start clutch means, for transmitting torque to said belt and sheave system, said slippable start clutch means operatively positioned between said torque input means and said belt and sheave system, said control system comprising:
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means for providing a first value representative of a limiting value of torsional vibrations transmitted to said belt and sheave system; means for providing a first signal representative of actual torsional vibrations transmitted to said belt and sheave system; means for comparing said first signal with said first value; clutch slip feedback means for providing a second signal representative of the actual slip across said start clutch; means for developing a clutch control signal in response to said comparing means determination that said first signal value exceeds said first value; and clutch adjustment means for modifying the slip across said start clutch to increase clutch slip by an incremental amount, said clutch adjustment means responsive to said comparing means and said clutch slip feedback means to reduce torsional vibrations; lock-up means for fully engaging said slippable start clutch. said lock-up means being activated to fully engage said slippable start clutch irrespective of the magnitude of said first signal. - View Dependent Claims (10, 11)
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Specification