METHOD AND APPARATUS FOR BRAKING A HYBRID ELECTIC VEHICLE
First Claim
1. A method for braking a hybrid electric vehicle having an internal combustion engine and a traction motor coupled to a common output shaft, with the vehicle further having an electric energy storage device connected to the traction motor, with said braking method comprising the steps of:
- monitoring operation of the vehicle to determine if the vehicle'"'"'s driver is operating the vehicle in a braking mode; and
in the event that the vehicle is being braked, controlling the engine and the traction motor so as to provide dynamic braking such that when the traction motor is operated regeneratively, the brake torque produced by the engine is reduced from a maximum contemporaneous brake torque value.
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Accused Products
Abstract
A method and system for braking a hybrid electric vehicle having an internal combustion engine and a traction motor coupled to a common output shaft, with the vehicle also having an energy storage battery. The method includes monitoring of the vehicle to determine if the vehicle'"'"'s driver is operating the vehicle in a braking mode and if so, controlling the engine and traction motor so as to provide dynamic braking such that when the traction motor is operated regeneratively, the brake torque produce by the engine is reduced from a maximum contemporaneous brake torque value.
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Citations
16 Claims
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1. A method for braking a hybrid electric vehicle having an internal combustion engine and a traction motor coupled to a common output shaft, with the vehicle further having an electric energy storage device connected to the traction motor, with said braking method comprising the steps of:
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monitoring operation of the vehicle to determine if the vehicle'"'"'s driver is operating the vehicle in a braking mode; and
in the event that the vehicle is being braked, controlling the engine and the traction motor so as to provide dynamic braking such that when the traction motor is operated regeneratively, the brake torque produced by the engine is reduced from a maximum contemporaneous brake torque value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for braking a hybrid electric vehicle having an internal combustion engine and a traction motor coupled to a common output shaft, with the vehicle further having an electric energy storage device connected to the traction motor, with said system comprising:
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a monitor for determining the state of charge of the electric energy storage device and for generating a state of charge signal;
a monitor for determining if the vehicle'"'"'s driver is operating the vehicle in a braking mode and for generating a braking signal; and
a controller for receiving the state of charge signal and the braking signal, and in the event that the vehicle is being braked, controlling the engine and the traction motor so as to provide dynamic braking such that when the state of charge of the electric energy storage device is less than a predetermined charge threshold, the traction motor is operated regeneratively and the brake torque produced by the engine is reduced from a maximum contemporaneous brake torque value to a lesser brake torque value. - View Dependent Claims (12, 13)
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14. A method for braking a hybrid electric vehicle having an internal combustion engine and a traction motor coupled to a common output shaft, and with the vehicle further having an electric energy storage device connected to the traction motor, with said braking method comprising the steps of:
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monitoring the state of charge of said electric energy storage device;
monitoring operation of the vehicle to determine if the vehicle'"'"'s driver is operating the vehicle in a braking mode; and
in the event that the vehicle is being braked at a time when the state of charge is less than a predetermined threshold, controlling the engine and the traction motor so as to provide dynamic braking such that when the traction motor is operated regeneratively the brake torque produced by the engine is reduced from a maximum contemporaneous brake torque value, with the sum of the brake torque produced by the engine and the brake torque produced by the traction motor being equivalent to said maximum contemporaneous brake torque from the engine. - View Dependent Claims (15, 16)
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Specification