System and method for compensation of turbo lag in hybrid vehicles
First Claim
1. A method of operating a hybrid vehicle using a hybrid controller, comprising:
- determining a zero boost power limit of an engine of the hybrid vehicle, said engine including a turbocharger;
determining a torque curve power limit of the engine, said torque curve power limit based upon the maximum available power when the turbocharger is operating;
monitoring a current power of the engine and a current maximum available power of the engine when the current maximum available power is between the zero boost power limit and the torque curve power limit; and
determining a dynamic response model of the engine based on said monitoring, said model providing an estimation of the engine output power over time as the turbocharger substantially contributes to the output power of the engine.
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Abstract
A system and method for compensation of turbo lag in hybrid vehicles is disclosed. The system identifies a zero boost power limit of the engine and a torque curve power limit. A turbocharger dynamic model is then developed based on measurements of the input engine power and the output max available engine power. The model is used to determine an overall propulsion power limit based on the combination of the engine and motor in operation. A power request by the driver may then be limited to the overall propulsion power limit to compensate for the effect of the turbocharger when propelling the vehicle using both the engine and motor and better simulate the engine-only response.
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Citations
42 Claims
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1. A method of operating a hybrid vehicle using a hybrid controller, comprising:
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determining a zero boost power limit of an engine of the hybrid vehicle, said engine including a turbocharger; determining a torque curve power limit of the engine, said torque curve power limit based upon the maximum available power when the turbocharger is operating; monitoring a current power of the engine and a current maximum available power of the engine when the current maximum available power is between the zero boost power limit and the torque curve power limit; and determining a dynamic response model of the engine based on said monitoring, said model providing an estimation of the engine output power over time as the turbocharger substantially contributes to the output power of the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A hybrid system, comprising:
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an engine having a turbocharger; an engine controller operatively coupled to the engine; an eMachine; a hybrid controller operatively coupled to the eMachine and in communication with the engine controller; wherein the hybrid controller is configured to; determine a zero boost power limit of the engine; receive torque curve information from the engine controller; determine a torque curve power limit of the engine from said torque curve information; monitor a current power of the engine and a current maximum available power of the engine when the current maximum available power is between the zero boost power limit and the torque curve power limit; and determine a dynamic response model of the engine based on said monitoring, said model providing an estimation of the engine output power over time as the turbocharger substantially contributes to the output power of the engine. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A hybrid system, comprising:
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an engine having a turbocharger; an engine controller operatively coupled to the engine; an eMachine; a hybrid controller operatively coupled to the eMachine and in communication with the engine controller; wherein the hybrid controller is configured to; receive a driver output torque request from said engine controller; determine a zero boost power limit of the engine; determine a torque curve power limit of the engine from torque curve information received from the engine controller; monitor a current power of the engine and a current maximum available power of the engine when the current maximum available power is between the zero boost power limit and the torque curve power limit; and determine a dynamic response model of the engine based on said monitoring, said model providing an estimation of the engine output power over time as the turbocharger substantially contributes to the output power of the engine; and operate the hybrid vehicle such that the collective output power of the engine and an eMachine of the hybrid vehicle is automatically limited to a turbo-equivalent power limit corresponding to said driver output torque request, said turbo-equivalent power limit determined using the dynamic response model and representing the power limit of the engine acting alone. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method of operating a hybrid vehicle using a hybrid controller, comprising:
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receiving a driver output torque request using the hybrid controller; determining a zero boost power limit of an engine of the hybrid vehicle, said engine including a turbocharger; determining a torque curve power limit of the engine, said torque curve power limit based upon the maximum available power when the turbocharger is operating at a predetermined level; monitoring a current power of the engine and a maximum available power of the engine when the maximum available power is between the zero boost power limit and the torque curve power limit; determining a dynamic response model of the engine based on said monitoring, said model providing an estimation of the engine output power over time as the turbocharger substantially contributes to the output power of the engine; using said model to determine said turbo-equivalent power limit; and using the hybrid controller, operating the hybrid vehicle such that the collective output power of an engine and an eMachine of the hybrid vehicle is automatically limited to said turbo-equivalent power limit corresponding to said driver output torque request, said turbo-equivalent power limit representing the power limit of the engine acting alone. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40)
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41. A method of operating a hybrid vehicle using a hybrid controller, comprising:
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determining a zero boost power limit of a turbocharged engine, the zero boost power limit is determined when the engine is operating without substantial power contributed from the turbocharger; determining a boosted torque curve power limit of the engine, said boosted torque curve power limit representing the maximum output power of the turbocharged engine when the turbocharger is substantially contributing to the output power of the engine; determining a dynamic response model of the engine output power when the output power of the turbocharged engine is between said zero boost power limit and said torque curve power limit wherein the dynamic response model includes a model of engine output power with respect to rotations per minute of the crankshaft of the turbocharged engine; and determining an engine-only torque curve of a turbocharged engine, including adjusting the output power of the engine and/or an eMachine when the engine and eMachine are used in conjunction, the adjusting performed to converge the output power with said dynamic response model. - View Dependent Claims (42)
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Specification