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US 8,798,884 B2Granted
Method for clutch control
AssigneeGM Global Technology Operations LLC
InventorsBrian M. Porto, Brian H. Fiore
Life of this patent
Estimating the term…
Abstract
A clutch control process for a motor vehicle transmission during brake lift-out monitors a time rate of change of a brake pedal position and torque to detect a lift-out condition with rapidly changing torque. When the process detects a brake lift-out condition, the process limits the minimum scheduled clutch pressure as well as modifies the clutch pressure to torque relationship.
Claims19
A method for clutch control of a transmission for a motor vehicle, the method comprising:
- determining using a controller, a brake lift-out condition;
- limiting a minimum scheduled clutch pressure if a brake lift-out condition is determined;
- and
- modifying the clutch pressure to a torque relationship,
- wherein in an event of an under-filled clutch, the clutch pressure is set to a calibrated valve, and wherein a difference between a possible torque valve and a target torque valve is reduced in comparison to when modifying the clutch pressure to torque relationship is not implemented.
2 more elements
A method for clutch control of a transmission for a motor vehicle, the method comprising:
- determining using a controller, a brake lift-out condition;
- limiting a minimum scheduled clutch pressure if a brake lift-out condition is determined;
- determining if an actual position of the brake pedal is not equal to an initial position of the brake position;
- and
- modifying the clutch pressure to a torque relationship,
- wherein in an event of an under-filled clutch, the clutch pressure is set to a calibrated valve, and wherein a difference between a possible torque valve and a target torque valve is reduced in comparison to when modifying the clutch pressure to torque relationship is not implemented.
3 more elements
Dependencies are inferred from the claim text.