Engine torque control for a hybrid electric vehicle using estimated engine torque
First Claim
1. A system for controlling engine torque in a parallel/series hybrid electric vehicle, comprising:
- a first control strategy embodied within a first controller to determine a modified engine torque signal from at least a desired engine torque signal and an estimated engine torque signal determined from at least an estimated generator motor torque signal; and
a second control strategy embodied within a second controller to determine variables for air, fuel and spark from said modified engine torque signal.
1 Assignment
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Accused Products
Abstract
A system and method for accurate control of engine torque for a parallel/series hybrid electric vehicle (PSHEV) is disclosed. An accurate estimate of engine torque is determined from the generator motor torque of a PSHEV. The estimated engine torque can then be used to control engine torque in a closed loop torque control strategy. The invention comprises at least one controller to receive, process and output torque signals; a first control strategy to determine a modified engine torque signal from at least a desired engine torque signal; and a second control strategy to determine variables for air, fuel and spark from said modified engine torque signal. The first control strategy can include a proportional integral (PI) controller. The estimated engine torque signal can be a function of an estimated generator motor torque signal, a generator motor speed signal and an engine torque loss signal.
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Citations
6 Claims
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1. A system for controlling engine torque in a parallel/series hybrid electric vehicle, comprising:
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a first control strategy embodied within a first controller to determine a modified engine torque signal from at least a desired engine torque signal and an estimated engine torque signal determined from at least an estimated generator motor torque signal; and
a second control strategy embodied within a second controller to determine variables for air, fuel and spark from said modified engine torque signal. - View Dependent Claims (2, 3)
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4. A method for controlling engine torque in a parallel/series hybrid electric vehicle, comprising the steps of:
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determining an estimated engine torque signal;
determining a modified engine torque signal from at least a desired engine torque signal and said estimated engine torque signal; and
determining variables for air, fuel and spark from said modified engine torque signal. - View Dependent Claims (5, 6)
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Specification