Gear shift control of a dual clutch transmission
AssigneeFord Global Technologies, LLC
InventorsKevin MacFarlane, Brian Keyse, Eileen A. Davidson, David Orton, Thomas R. Langeland
Life of this patent
Estimating the term…
Abstract
A method for controlling a gear shift of a dual clutch transmission having an offgoing clutch and an oncoming clutch, includes using torque transmitted by the oncoming clutch to control torque at a transmission output, using a speed of a power source to control a transfer of torque between the offgoing clutch and the oncoming clutch, and varying said torque capacity to produce a target slip across the oncoming clutch when the shift is completed.
Claims17
A method for controlling a gear shift of a dual clutch transmission, comprising:
- (a) after increasing torque in an oncoming clutch, producing engine speed greater than synchronous speed in a target gear;
- (b) controlling slip across said clutch such that a difference between demanded engine torque and current engine torque is less than a reference difference;
- (c) producing a target slip across the oncoming clutch at the end of the shift by reducing said difference.
A method for controlling a gear shift of a dual clutch transmission, having an offgoing clutch and an oncoming clutch, comprising:
- (a) controlling a speed of a power source at a first speed greater than a synchronous speed of a current gear;
- (b) decreasing torque transmitted by the offgoing clutch and increasing torque transmitted by the oncoming clutch;
- (c) controlling the speed of a power source toward a second speed greater than a synchronous speed of a target gear;
- (d) controlling torque transmitted by the oncoming clutch to produce a target slip across the oncoming clutch when the shift is completed.
A method for controlling a gear shift of a dual clutch transmission, comprising:
- (a) decreasing torque transmitted by an offgoing clutch and increasing torque transmitted by an oncoming clutch;
- (b) controlling a speed of an engine toward a speed greater than a synchronous speed of a target gear;
- (c) controlling torque transmitted by the oncoming clutch such that a difference between a demanded engine torque and a current engine torque is less than a target error;
- (d) controlling engine torque such that slip across the oncoming clutch is within a target range when the shift is completed.
Dependencies are inferred from the claim text.