Dynamic Compensation For Clutch Control During Shift

摘要

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.

主权项

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 dynamic response model and a record of commanded pressures;estimate a torque transmitted by the clutch; andadapt the static transfer function based on the estimated transmitted torque and the estimated actual current pressure.