Method for controlling a hybrid electric vehicle
First Claim
1. A method for controlling a hybrid electric vehicle having a primary power source and a secondary power source comprising:
- estimating the power capability of the primary power source;
obtaining a driver power command;
establishing a primary power demand for the primary power source, a secondary power demand for the secondary power source, and a desired power balance between the primary power demand and the secondary power demand;
calculating a system power capability based on the desired power balance and the estimated power capability of the primary power source;
determining if the driver power command exceeds the system power capability;
limiting the driver power command if the driver power command exceeds the system power capability; and
executing the limited driver power command.
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Abstract
The present invention provides a method adapted to control a hybrid electric vehicle having a primary power source and a secondary power source. The method includes estimating the power capability of the primary power source, and thereafter obtaining a power command from the vehicle'"'"'s driver. A primary power demand and a secondary power demand which collectively meet the driver power command are then established, and a desired power balance between the primary power demand and the secondary power demand is also obtained. A system power capability is calculated based on the desired power balance and the estimated power capability. The method of the present invention then determines if the driver power command exceeds the system power capability. If the driver power command exceeds the system power capability, the driver power command limited and thereafter the limited driver power command is executed.
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Citations
11 Claims
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1. A method for controlling a hybrid electric vehicle having a primary power source and a secondary power source comprising:
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estimating the power capability of the primary power source; obtaining a driver power command; establishing a primary power demand for the primary power source, a secondary power demand for the secondary power source, and a desired power balance between the primary power demand and the secondary power demand; calculating a system power capability based on the desired power balance and the estimated power capability of the primary power source; determining if the driver power command exceeds the system power capability; limiting the driver power command if the driver power command exceeds the system power capability; and executing the limited driver power command. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for controlling a hybrid electric vehicle having a primary power source and a secondary power source comprising:
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estimating the power capability of the primary power source; obtaining a driver power command; establishing a primary power demand for the primary power source and secondary power demand for the secondary power source which collectively meet the driver power command; establishing a desired power balance between the primary power demand and the secondary power demand; calculating a system power capability based on the desired power balance and the estimated power capability of the primary power source; determining if the driver power command exceeds the system power capability; executing the driver power command if the driver power command does not exceed the system power capability; limiting the driver power command if the driver power command exceeds the system power capability; and executing the limited driver power command if the driver power command exceeds the system power capability. - View Dependent Claims (8, 9, 10)
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11. A method for controlling a hybrid electric vehicle having an engine and an electric motor/generator comprising:
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estimating the power capability of the engine; monitoring the position of a gas pedal and implementing a throttle lookup table to obtain a driver power command; establishing an engine power demand for the engine and a motor/generator power demand for the motor/generator which collectively meet the driver power command; establishing a desired power balance between the engine power demand and the motor/generator power demand; calculating a system power capability based on the desired power balance and the estimated power capability of the engine; determining if the driver power command exceeds the system power capability; executing the driver power command if the driver power command does not exceed the system power capability; limiting the driver power command if the driver power command exceeds the system power capability; and executing the limited driver power command if the driver power command exceeds the system power capability.
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Specification