Methods and systems for vehicle driveline torque estimation
First Claim
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1. A method for operating a hybrid driveline, comprising:
- adjusting engine torque production in response to a torque transferred across a dual mass flywheel, the torque transferred across the dual mass flywheel responsive to an amount of spring deflection within the dual mass flywheel, where a position of an input side of the dual mass flywheel is based on an engine crankshaft position sensor, and where a position of an output side of the dual mass flywheel is based on a dual mass flywheel position sensor located between the dual mass flywheel and a driveline disconnect clutch on the output side of the dual mass flywheel, and where a transmission of the hybrid driveline is shifted into neutral in response to a driver demand torque less than a threshold driver demand torque and a vehicle speed greater than a threshold vehicle speed.
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Abstract
Systems and methods for improving hybrid vehicle torque control are presented. The system and methods included may estimate driveline torque via springs of a dual mass flywheel. The estimated driveline torque may provide feedback for adjusting operation of a driveline disconnect clutch and/or engine torque.
12 Citations
17 Claims
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1. A method for operating a hybrid driveline, comprising:
adjusting engine torque production in response to a torque transferred across a dual mass flywheel, the torque transferred across the dual mass flywheel responsive to an amount of spring deflection within the dual mass flywheel, where a position of an input side of the dual mass flywheel is based on an engine crankshaft position sensor, and where a position of an output side of the dual mass flywheel is based on a dual mass flywheel position sensor located between the dual mass flywheel and a driveline disconnect clutch on the output side of the dual mass flywheel, and where a transmission of the hybrid driveline is shifted into neutral in response to a driver demand torque less than a threshold driver demand torque and a vehicle speed greater than a threshold vehicle speed. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for operating a hybrid driveline, comprising:
adjusting engine torque production in response to a torque delivered across a dual mass flywheel, the torque delivered across the dual mass flywheel responsive to spring deflection in the dual mass flywheel and one or a combination of a first offset and a second offset, the first offset established via shifting a transmission of the hybrid driveline into neutral during a first mode, the second offset established via operating the transmission in a forward gear during a second mode, and shifting the transmission into neutral in response to a reduction in driver demand torque. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A hybrid vehicle system, comprising:
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an engine coupled to a dual mass flywheel; a motor selectively coupled to the engine via a driveline disconnect clutch; a controller including non-transitory instructions executable to adjust engine torque in response to a torque transferred across the dual mass flywheel, and additional instructions to estimate the torque transferred across the dual mass flywheel based on a position offset between an input side of the dual mass flywheel and an output side of the dual mass flywheel; and an automatic transmission and additional instructions to shift the automatic transmission into neutral in response to determining the position offset. - View Dependent Claims (14, 15, 16, 17)
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Specification