System and method for battery protection strategy for hybrid electric vehicles
First Claim
1. A method for controlling a hybrid powertrain system for an automotive vehicle operated by a user, the system having an engine, an electric machine that performs as a motor in one mode of operation and performs as a generator in another mode of operation, a battery connected to the electric machine, and a generator configured to receive mechanical power from the engine and to present electrical power to at least one of the electric machine and the battery, and at least one of the engine and the electric machine establish a power source for providing power to vehicle traction wheels, the method comprising the steps of:
- determining a first power state of the hybrid powertrain system;
limiting electrical power generated by the generator to the minimum of the rated power limit of the generator and the first power state, when the first power state is greater than zero; and
limiting the electrical power generated by the generator to zero, and limiting the power limit of the electric machine during generating to a first operating condition of the hybrid powertrain system, when the first power state is less than or equal to zero, to provide over-charge protection to the battery.
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Accused Products
Abstract
A method for controlling a hybrid powertrain system includes the steps of determining a first power state of the hybrid powertrain system, limiting electrical power generated by a generator to the minimum of the rated power limit of the generator and the first power state, when the first power state is greater than zero, and limiting the electrical power generated by the generator to zero, and limiting the power limit of an electric machine during generating to a first operating condition of the hybrid powertrain system, when the first power state is less than or equal to zero, to provide over-charge protection to the battery. The method further includes steps that provide over-discharge protection to the battery.
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Citations
26 Claims
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1. A method for controlling a hybrid powertrain system for an automotive vehicle operated by a user, the system having an engine, an electric machine that performs as a motor in one mode of operation and performs as a generator in another mode of operation, a battery connected to the electric machine, and a generator configured to receive mechanical power from the engine and to present electrical power to at least one of the electric machine and the battery, and at least one of the engine and the electric machine establish a power source for providing power to vehicle traction wheels, the method comprising the steps of:
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determining a first power state of the hybrid powertrain system; limiting electrical power generated by the generator to the minimum of the rated power limit of the generator and the first power state, when the first power state is greater than zero; and limiting the electrical power generated by the generator to zero, and limiting the power limit of the electric machine during generating to a first operating condition of the hybrid powertrain system, when the first power state is less than or equal to zero, to provide over-charge protection to the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for controlling a hybrid powertrain for an automotive vehicle operated by a user, the system comprising:
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an engine; an electric machine that performs as a motor in one mode of operation and performs as a generator in another mode of operation; a battery connected to the electric machine, wherein at least one of the engine and the electric machine establish a power source for providing power to vehicle traction wheels; a generator configured to receive mechanical power from the engine and to present electrical power to at least one of the electric machine and the battery; and a controller configured to; determine a first power state of the hybrid powertrain system; limit electrical power generated by the generator to the minimum of the rated power limit of the generator and the first power state, when the first power state is greater than zero; and limit the electrical power generated by the generator to zero, and limit the power limit of the electric machine during generating to a first operating condition of the hybrid powertrain system, when the first power state is less than or equal to zero, to provide over-charge protection to the battery. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A vehicle system controller (VSC) for controlling a hybrid powertrain system for an automotive vehicle operated by a user, the system having an engine, an electric machine that performs as a motor in one mode of operation and performs as a generator in another mode of operation, a battery connected to the electric machine, and a generator configured to receive mechanical power from the engine and to present electrical power to at least one of the electric machine and the battery, and at least one of the engine and the electric machine establish a power source for providing power to vehicle traction wheels, the vehicle system controller comprising:
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a regulator configured to receive a commanded engine speed signal and an actual engine speed signal, and present a transient state portion of a commanded generator output torque signal for regulation of speed of the engine; a first memory including a model for over-charge protection of the battery that receives a voltage of the battery, a temperature of the battery, and a state of charge (SOC) of the battery, and presents a first charge current limit of the battery for over-voltage protection, a second charge current limit signal for over-current charge protection, and a battery charge power limit; and a second memory including a model for under-voltage protection for the battery that receives the voltage of the battery, the temperature of the battery, and the SOC of the battery, and presents a first discharge current limit of the battery for under-voltage protection, a second battery discharge current limit for over-current discharge protection, and a battery discharge power limit. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26)
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Specification