Dynamic compensation for clutch control during shift
First Claim
1. A transmission comprising:
- a clutch; and
a controller programmed to;
command a pressure based on a target clutch torque and a static transfer function to control a torque capacity of the clutch;
estimate an actual current pressure based on a first order distributed delay and a record of commanded pressures;
estimate a torque transmitted by the clutch; and
adapt the static transfer function based on the estimated transmitted torque and the estimated actual current pressure.
1 Assignment
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Accused Products
Abstract
When a transmission controller issues a control command, such as pressure to control clutch torque, the response may be delayed due to dynamic properties of the control system. These properties can be modeled using a dynamic response model. One potential model is a combination of a pure time delay and a first order distributed delay. Control methods may be improved in several ways by accounting for the dynamic response. First, the dynamic response model may be used to improve adaptation of a transfer function between the commanded control signal and the clutch torque. Second, the command may be adjusted based on the dynamic response model. Both the pure time delay and the time constant of the first order distributed delay may be functions of operating conditions such as temperature.
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Citations
13 Claims
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1. A transmission comprising:
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a clutch; and a controller programmed to; command a pressure based on a target clutch torque and a static transfer function to control a torque capacity of the clutch; estimate an actual current pressure based on a first order distributed delay and a record of commanded pressures; estimate a torque transmitted by the clutch; and adapt the static transfer function based on the estimated transmitted torque and the estimated actual current pressure. - View Dependent Claims (2, 3, 4)
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5. A transmission comprising:
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a clutch; and a controller programmed to generate a target clutch torque profile, calculate a desired control signal profile based on a static transfer function and the target clutch torque profile, calculate a commanded control signal by applying a lead-lag filter to the desired control signal profile, issue the commanded control signal to the clutch, estimate a current control signal value based on a dynamic response model and the commanded control signal profile, estimate a current actual clutch torque, and adapt the static transfer function based on the estimated current actual clutch torque and the estimated current control signal value. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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Specification