Methods and systems for a driveline disconnect clutch
First Claim
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1. A method of operating a hybrid vehicle driveline, comprising:
- opening a torque converter clutch of a torque converter that is closed in response to an engine start request;
adjusting a driveline integrated starter/generator (DISG) speed in response to a desired torque converter impeller speed while the torque converter clutch is open in response to the engine start request, and where a DISG is mechanically coupled to an impeller of the torque converter and a transmission input shaft is coupled to a turbine of the torque converter; and
closing a driveline disconnect clutch in response to the engine start request.
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Abstract
Systems and methods for improving operation of a hybrid vehicle are presented. In one example, compensation for a driveline disconnect clutch is provided. The approaches may reduce driveline torque disturbances.
70 Citations
20 Claims
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1. A method of operating a hybrid vehicle driveline, comprising:
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opening a torque converter clutch of a torque converter that is closed in response to an engine start request; adjusting a driveline integrated starter/generator (DISG) speed in response to a desired torque converter impeller speed while the torque converter clutch is open in response to the engine start request, and where a DISG is mechanically coupled to an impeller of the torque converter and a transmission input shaft is coupled to a turbine of the torque converter; and closing a driveline disconnect clutch in response to the engine start request. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a hybrid vehicle driveline, comprising:
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opening a torque converter clutch in response to an engine start request; operating a driveline integrated starter/generator (DISG) in a speed control mode in response to the engine start request; adjusting DISG speed based a desired torque converter impeller speed in response to the engine start request while the torque converter clutch is open; starting an engine via closing a driveline disconnect clutch; and locking the driveline disconnect clutch in response to a speed of the engine being equal to DISG speed. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A hybrid vehicle driveline system, comprising:
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a driveline integrated starter/generator (DISG); an engine; a driveline disconnect clutch positioned in a driveline between the engine and the DISG; a transmission including a torque converter clutch positioned downstream of the DISG; and a controller including executable non-transitory instructions for closing the driveline disconnect clutch and operating the DISG in a speed control mode, a desired torque converter impeller torque provided via adjusting DISG speed in response to a torque converter turbine speed and the desired torque converter impeller torque. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification