METHOD FOR CONTROLLING AN ENGINE OF A HYBRID POWERTRAIN IN A FUEL ENRICHMENT MODE
First Claim
7. Method for controlling an engine coupled to an input member of a hybrid transmission, the hybrid transmission operative to transfer torque between the input member and first and second torque machines and an output member to generate an output torque in response to an operator torque request, the method comprising:
- monitoring the operator torque request;
determining a maximum engine torque operating the engine at stoichiometry;
determining maximum motor torques output from the first and second torque machines;
determining a maximum output torque from the hybrid transmission when the first and second torque machines are each generating the maximum motor torques and the engine is generating the maximum engine torque operating at stoichiometry;
determining a maximum engine torque constraint associated with a capacity of the hybrid transmission to transfer torque between the input member and the first and second torque machines and the output member;
determining a fuel enrichment torque for operating the engine based upon the operator torque request and the maximum engine torque operating the engine at stoichiometry;
constraining the fuel enrichment torque based upon the maximum engine torque constraint; and
controlling the engine based upon the constrained fuel enrichment torque.
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Accused Products
Abstract
An engine is coupled to an input member of a hybrid transmission. The hybrid transmission is operative to transfer torque between the input member and a torque machine and an output member to generate an output torque in response to an operator torque request. The torque machine is connected to an energy storage device. A method for controlling the engine includes monitoring the operator torque request, determining a maximum engine torque operating the engine at stoichiometry, determining a maximum motor torque output from the torque machine, determining a maximum output torque from the hybrid transmission when the torque machine is generating the maximum motor torque and the engine is generating the maximum engine torque operating at stoichiometry, and controlling the engine in a fuel enrichment mode when the operator torque request exceeds the maximum output torque from the hybrid transmission when the torque machine is generating the maximum motor torque and the engine is generating the maximum engine torque operating at stoichiometry.
247 Citations
14 Claims
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7. Method for controlling an engine coupled to an input member of a hybrid transmission, the hybrid transmission operative to transfer torque between the input member and first and second torque machines and an output member to generate an output torque in response to an operator torque request, the method comprising:
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monitoring the operator torque request; determining a maximum engine torque operating the engine at stoichiometry; determining maximum motor torques output from the first and second torque machines; determining a maximum output torque from the hybrid transmission when the first and second torque machines are each generating the maximum motor torques and the engine is generating the maximum engine torque operating at stoichiometry; determining a maximum engine torque constraint associated with a capacity of the hybrid transmission to transfer torque between the input member and the first and second torque machines and the output member; determining a fuel enrichment torque for operating the engine based upon the operator torque request and the maximum engine torque operating the engine at stoichiometry; constraining the fuel enrichment torque based upon the maximum engine torque constraint; and controlling the engine based upon the constrained fuel enrichment torque. - View Dependent Claims (1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14)
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11-1. The method of claim 10, further comprising determining a fuel enrichment torque for operating the engine based upon the operator torque request and the maximum engine torque operating the engine at stoichiometry.
Specification