Methods and systems for adjusting driveline disconnect clutch operation
First Claim
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1. A driveline operating method, comprising:
- adjusting application force of a driveline disconnect clutch in a vehicle driveline in response to a driveline disconnect clutch torque estimate that is based on torque converter output torque and a driveline integrated starter/generator torque; and
providing driveline braking via the driveline integrated starter/generator torque while rotation of an engine is stopped, the driveline integrated starter/generator torque providing negative torque equivalent to an amount of torque the engine provides during deceleration fuel shut off while providing driveline braking.
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Abstract
Systems and methods for improving operation of a hybrid vehicle are presented. In one example, torque transferred via a driveline disconnect clutch is estimated based on characteristics of a torque converter to improve driveline operation.
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Citations
20 Claims
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1. A driveline operating method, comprising:
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adjusting application force of a driveline disconnect clutch in a vehicle driveline in response to a driveline disconnect clutch torque estimate that is based on torque converter output torque and a driveline integrated starter/generator torque; and providing driveline braking via the driveline integrated starter/generator torque while rotation of an engine is stopped, the driveline integrated starter/generator torque providing negative torque equivalent to an amount of torque the engine provides during deceleration fuel shut off while providing driveline braking. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A driveline operating method, comprising:
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incrementally increasing a driveline disconnect clutch application command; adjusting a transfer function of a driveline disconnect clutch in a vehicle driveline in response to incrementally increasing the driveline disconnect clutch application command, a driveline disconnect clutch torque estimate that is based on a torque converter output torque, and a driveline integrated starter/generator torque; operating the driveline disconnect clutch in response to the transfer function; and providing driveline braking via a driveline integrated starter/generator while rotation of an engine is stopped and the driveline disconnect clutch is open, the driveline integrated starter/generator providing negative torque equivalent to an amount of torque the engine provides during deceleration fuel shut off while providing driveline braking. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A vehicle system, comprising:
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an engine; a dual mass flywheel including a first side mechanically coupled to the engine; a driveline disconnect clutch including a first side mechanically coupled to a second side of the dual mass flywheel; a driveline integrated starter/generator (DIS G) including a first side coupled to a second side of the driveline disconnect clutch; a transmission selectively coupled to the engine via the driveline disconnect clutch; and a controller including executable instructions stored in non-transitory memory to adjust an estimate of torque transferred through the driveline disconnect clutch in response to a torque converter output torque estimate, and operate the driveline disconnect clutch in response to the estimate of torque transferred through the driveline disconnect clutch, and further instructions to open the driveline disconnect clutch while the engine is stopped. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification