Method and control architecture for optimization of cylinder deactivation selection and engine input torque for a hybrid powertrain system
First Claim
1. Method for operating an internal combustion engine adapted to transmit torque to a hybrid transmission, comprising:
- determining engine input torque transmittable to the hybrid transmission for a plurality of engine states the engine states comprising an all-cylinder state and a cylinder-deactivation state wherein fewer than all cylinders remain active;
executing a one-dimensional search engine over a range of engine input torques for each of the all-cylinder engine state and the cylinder-deactivation state to determine a minimum powertrain system operating cost and an associated engine input torque to meet an operator torque request for each of the all-cylinder engine state and the cylinder-deactivation state; and
controlling the engine state to one of the all-cylinder state and the cylinder-deactivation state based upon the minimum powertrain system operating costs;
wherein executing the one-dimensional search engine comprises iteratively selecting parametric values for the engine input torque over the range of engine input torques, and, executing a system equation to determine associated motor torques for operating the hybrid transmission to meet the operator torque request and executing a cost function for each of the iteratively selected parametric values for engine input torque and the associated motor torques to determine a powertrain system operating cost.
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Accused Products
Abstract
A method and article of manufacture are provided for operating an internal combustion engine adapted to transmit torque to a hybrid transmission. The method comprises determining engine input torque transmittable to the hybrid transmission for a plurality of engine states the engine states comprising an all-cylinder operation and a cylinder-deactivation operation. Costs are determined for operating the engine and hybrid transmission in the engine states to substantially meet an operator torque request. The engine state is controlled to one of the all-cylinder operation and the cylinder-deactivation operation based upon the costs.
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Citations
12 Claims
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1. Method for operating an internal combustion engine adapted to transmit torque to a hybrid transmission, comprising:
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determining engine input torque transmittable to the hybrid transmission for a plurality of engine states the engine states comprising an all-cylinder state and a cylinder-deactivation state wherein fewer than all cylinders remain active; executing a one-dimensional search engine over a range of engine input torques for each of the all-cylinder engine state and the cylinder-deactivation state to determine a minimum powertrain system operating cost and an associated engine input torque to meet an operator torque request for each of the all-cylinder engine state and the cylinder-deactivation state; and controlling the engine state to one of the all-cylinder state and the cylinder-deactivation state based upon the minimum powertrain system operating costs; wherein executing the one-dimensional search engine comprises iteratively selecting parametric values for the engine input torque over the range of engine input torques, and, executing a system equation to determine associated motor torques for operating the hybrid transmission to meet the operator torque request and executing a cost function for each of the iteratively selected parametric values for engine input torque and the associated motor torques to determine a powertrain system operating cost. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Method for operating a hybrid powertrain, the hybrid powertrain comprising an internal combustion engine, an energy storage system, an electric machine, and an electro-mechanical transmission, the energy storage system and electric machine electrically-operatively coupled for power flow therebetween;
- and, the engine, electric machine, and the electro-mechanical transmission mechanically-operatively coupled to transmit power therebetween to transmit torque to an output, the method comprising;
determining allowable engine states and an operator torque request; determining engine input torque transmittable to the electro-mechanical transmission for engine states comprising an all-cylinder operation and a cylinder-deactivation operation wherein fewer than all cylinders remain active; executing a one-dimensional search engine over a range of engine input torques for each of the all-cylinder engine state and the cylinder-deactivation state to determine a minimum powertrain system operating cost and an associated engine input torque to meet an operator torque request for each of the all-cylinder engine state and the cylinder-deactivation state; and controlling the engine state to one of the engine states comprising an all-cylinder operation and a cylinder-deactivation operation based upon the costs; wherein executing the one-dimensional search engine comprises iteratively selecting parametric values for the engine input torque over the range of engine input torques, and, executing a system equation to determine associated motor torques for operating the hybrid transmission to meet the operator torque request and executing a cost function for each of the iteratively selected parametric values for engine input torque and the associated motor torques to determine a powertrain system operating cost. - View Dependent Claims (12)
- and, the engine, electric machine, and the electro-mechanical transmission mechanically-operatively coupled to transmit power therebetween to transmit torque to an output, the method comprising;
Specification