Front end motor-generator system and hybrid electric vehicle operating method
First Claim
1. A method of operating a hybrid electric arrangement for an internal combustion engine of a vehicle having an integrated switchable coupling at a front of the engine co-axially aligned with a front end of an engine crankshaft, the integrated switchable coupling having a selectively-engageable clutch between an engine-side of the coupling coupled to the front end of the engine crankshaft and an engine accessory drive on a drive-side of the integrated switchable coupling, the drive-side of the integrated switchable coupling being arranged to transfer torque from a motor-generator laterally offset from a rotation axis of the crankshaft to the engine accessory drive and, when the integrated switchable coupling is engaged, to and from the crankshaft, comprising the acts of:
- determining an operating state of the vehicle with a front end motor-generator controller based on operating state information received from at least one of a vehicle sensor and another controller of the vehicle;
determining from the determined operating state a current operating priority with the front end motor-generator controller, wherein the current operating priority is one of;
meeting a safety requirement, the safety requirement including at least a requirement to maintain a vehicle system within a system operating limit,meeting an energy store requirement, the energy store requirement including at least a requirement to maintain a state of charge of an energy store above first state of charge level,meeting an engine operating requirement, the engine operating requirement including at least a requirement to maintain an engine operating parameter within an operating limit, the engine operating parameter including at least an engine coolant temperature, andmeeting a driver comfort requirement, the driver comfort requirement including at least a requirement to maintain a climate condition of a passenger compartment of the vehicle in a desired temperature range;
selecting an operating mode of the hybrid electric arrangement with the front end motor-generator controller based on the determined current operating priority, wherein the determined operating mode is one of a plurality of motor-generator operating modes, the plurality of motor-generator operating modes including at least one of an electrical energy generating mode, an engine accessory drive torque generating mode, a supplemental engine torque generating mode, and an idle mode; and
controlling operation of the motor-generator and the integrated switchable coupling in response to commands from the front end motor-generator controller to implement the selected operating mode,wherein the act of controlling operation of the motor-generator and the integrated switchable coupling includes placing the integrated switchable coupling into one of an engaged state in which torque is transferable between the motor-generator and the crankshaft, and a disengaged state in which the motor-generator is disengaged from the crankshaft and torque from the motor-generator is transferable to the drive-side of the integrated switchable coupling to drive the engine accessory drive to drive at least one engine accessory.
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Accused Products
Abstract
A system and method are provided for hybrid electric internal combustion engine applications in which a motor-generator, a narrow switchable coupling and a torque transfer unit therebetween are arranged and positioned in the constrained environment at the front of an engine in applications such as commercial vehicles, off-road vehicles and stationary engine installations. The motor-generator is preferably positioned laterally offset from the switchable coupling, which is co-axially-arranged with the front end of the engine crankshaft. The switchable coupling is an integrated unit in which a crankshaft vibration damper, an engine accessory drive pulley and a disengageable clutch overlap such that the axial depth of the clutch-pulley-damper unit is nearly the same as a conventional belt drive pulley and engine damper. The front end motor-generator system includes an electrical energy store that receives electrical energy generated by the motor-generator when the coupling is engaged. When the coupling is disengaged, the motor-generator may drive the pulley portion of the clutch-pulley-damper to drive the engine accessories using energy returned from the energy store, independent of the engine crankshaft.
192 Citations
17 Claims
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1. A method of operating a hybrid electric arrangement for an internal combustion engine of a vehicle having an integrated switchable coupling at a front of the engine co-axially aligned with a front end of an engine crankshaft, the integrated switchable coupling having a selectively-engageable clutch between an engine-side of the coupling coupled to the front end of the engine crankshaft and an engine accessory drive on a drive-side of the integrated switchable coupling, the drive-side of the integrated switchable coupling being arranged to transfer torque from a motor-generator laterally offset from a rotation axis of the crankshaft to the engine accessory drive and, when the integrated switchable coupling is engaged, to and from the crankshaft, comprising the acts of:
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determining an operating state of the vehicle with a front end motor-generator controller based on operating state information received from at least one of a vehicle sensor and another controller of the vehicle; determining from the determined operating state a current operating priority with the front end motor-generator controller, wherein the current operating priority is one of; meeting a safety requirement, the safety requirement including at least a requirement to maintain a vehicle system within a system operating limit, meeting an energy store requirement, the energy store requirement including at least a requirement to maintain a state of charge of an energy store above first state of charge level, meeting an engine operating requirement, the engine operating requirement including at least a requirement to maintain an engine operating parameter within an operating limit, the engine operating parameter including at least an engine coolant temperature, and meeting a driver comfort requirement, the driver comfort requirement including at least a requirement to maintain a climate condition of a passenger compartment of the vehicle in a desired temperature range; selecting an operating mode of the hybrid electric arrangement with the front end motor-generator controller based on the determined current operating priority, wherein the determined operating mode is one of a plurality of motor-generator operating modes, the plurality of motor-generator operating modes including at least one of an electrical energy generating mode, an engine accessory drive torque generating mode, a supplemental engine torque generating mode, and an idle mode; and controlling operation of the motor-generator and the integrated switchable coupling in response to commands from the front end motor-generator controller to implement the selected operating mode, wherein the act of controlling operation of the motor-generator and the integrated switchable coupling includes placing the integrated switchable coupling into one of an engaged state in which torque is transferable between the motor-generator and the crankshaft, and a disengaged state in which the motor-generator is disengaged from the crankshaft and torque from the motor-generator is transferable to the drive-side of the integrated switchable coupling to drive the engine accessory drive to drive at least one engine accessory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification