Calibration method for a slip control arrangement of a driveline including a continuously variable transmission
AssigneeTransmission Cvtcorp Inc.
InventorsJonathan Guérin, Jean-François Dionne
Life of this patent
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Abstract
A calibration method for a slip control arrangement of a driveline including a continuously variable transmission is described herein. The driveline includes a clutch that is so controlled as to slip when a torque higher than the usable torque attempts to pass through. Accordingly, the clutch prevents the prime mover from stalling. A calibration method to link a valve command value and a torque allowed to pass through the clutch includes preventing the vehicle from moving and increasing the pressure applied in the clutch while noting the torque % value developed by the prime mover.
Claims16
A calibration method for a slip control arrangement of a vehicle driveline including a continuously variable transmission where slipping is allowed via a clutch provided with a clutch controller that determines, via a valve mechanism, the amount of torque allowed to pass through the clutch before the clutch starts slipping;
- the driveline including a prime mover and a controller so connected to the prime mover as to receive torque data therefrom;
- the calibration method of the valve mechanism comprising:
- placing the prime mover in predetermined rotational speed conditions while preventing the vehicle from moving;
- closing the valve mechanism;
- recording an idle engine torque value from the torque data from the prime mover;
- gradually opening the valve mechanism until a first predetermined engine torque data value is reached and recording a first valve setting value and a corresponding engine torque value;
- gradually opening the valve mechanism until a second predetermined engine torque data value is reached and recording a second valve setting value and a corresponding engine torque value;
- calculating a clutch kiss point valve setting;
- gradually opening the valve mechanism until a third predetermined engine torque data value is reached and recording a third valve setting value and a corresponding engine torque value;
- calculating a 100% torque point;
- and
- calculating clutch torques corresponding to engine torque values.
In a driveline comprising a prime mover, a continuously variable transmission, a controller so connected to the prime mover as to receive torque data therefrom, a slip control arrangement including a clutch so controlled by a clutch controller including a valve mechanism to allow a controllable amount of torque to pass through the clutch and to slip if a higher amount of torque tries to pass, a calibration method of the valve mechanism comprising:
- placing the prime mover in predetermined rotational speed conditions while preventing the vehicle from moving;
- closing the valve mechanism;
- recording an idle engine torque value from the torque data from the prime mover;
- gradually opening the valve mechanism until a first predetermined engine torque data value is reached and recording a first valve setting and a corresponding engine torque value;
- gradually opening the valve mechanism until a second predetermined engine torque data value is reached and recording a second valve setting and a corresponding engine torque value;
- calculating a clutch kiss point;
- gradually opening the valve mechanism until a third predetermined engine torque data value is reached and recording a third valve setting and a corresponding engine torque value;
- calculating a 100% torque point;
- and
- calculating clutch torques corresponding to engine torques.
Dependencies are inferred from the claim text.