Closed-loop power control for hybrid electric vehicles
First Claim
1. A method for controlling a hybrid powertrain for an automotive vehicle having a driver controlled engine, an electric motor, a battery, a generator connected to the battery and a gear system that establishes first and second power sources for distributing torque to vehicle traction wheels, the method comprising the steps of:
- delivering engine torque to a first torque input element of the gear system, delivering reaction torque of the gear system to the motor and generator and delivering torque from a torque output element of the gear system to the traction wheels thereby establishing a power split in a first power source configuration;
delivering torque from the motor and generator through the gear system to the traction wheels with the engine deactivated thereby establishing a second power source configuration; and
coordinating power delivery from the first and second power sources using a closed-loop calculation of optimum actual allowed driver power demand with actual battery power as a feedback variable whereby a response to driver demand for power will optimize driveline efficiency and performance without exceeding calibrated power limits for the engine and the battery.
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Abstract
A control system and control method for a hybrid electric vehicle powertrain having an engine, an electric motor and an electric generator with gearing for effecting split power distribution from separate power sources. Power delivery to vehicle traction wheels is coordinated to meet a driver'"'"'s demand for power as much as possible without violating predefined maximum and minimum powertrain limits, including the limits of the battery subsystem.
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Citations
18 Claims
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1. A method for controlling a hybrid powertrain for an automotive vehicle having a driver controlled engine, an electric motor, a battery, a generator connected to the battery and a gear system that establishes first and second power sources for distributing torque to vehicle traction wheels, the method comprising the steps of:
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delivering engine torque to a first torque input element of the gear system, delivering reaction torque of the gear system to the motor and generator and delivering torque from a torque output element of the gear system to the traction wheels thereby establishing a power split in a first power source configuration;
delivering torque from the motor and generator through the gear system to the traction wheels with the engine deactivated thereby establishing a second power source configuration; and
coordinating power delivery from the first and second power sources using a closed-loop calculation of optimum actual allowed driver power demand with actual battery power as a feedback variable whereby a response to driver demand for power will optimize driveline efficiency and performance without exceeding calibrated power limits for the engine and the battery. - View Dependent Claims (2, 3, 4, 5)
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6. A closed-loop power control system for a powertrain for a hybrid electric vehicle comprising:
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a driver controlled engine, a battery, a motor, gearing and a generator defining an electric drive system;
a planetary gear unit having a sun gear, a ring gear and a planetary carrier, the engine being connected to the carrier and the sun gear being connected to the generator;
a geared torque flow path defined by the electric drive system extending to vehicle traction wheels, a torque input element of the gearing being connected to the motor; and
a vehicle system controller for coordinating power distribution from the engine and the battery using a closed-loop calculation of optimum actual allowed driver power demand with actual battery power as a feedback variable to effect optimal powertrain performance within predefined battery power charging and discharging limits. - View Dependent Claims (7, 8)
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9. A method for controlling a hybrid powertrain for an automotive vehicle having a driver controlled engine, an electric motor, a battery, a generator connected to the battery and a gear system that establishes first and second power sources for distributing torque to vehicle traction wheels, the method comprising the steps of:
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delivering engine torque to drive the generator, the generator being electrically connected to the motor, the motor being mechanically connected to the gear system;
delivering torque from a torque output element of the gear system to the traction wheels in a first power source configuration;
delivering torque from the motor through the gear system to the traction wheels thereby establishing a second power source configuration; and
coordinating power delivery from the first and second power sources using a closed-loop calculation of optimum actual allowed driver power demand with actual battery power as a feedback variable whereby a response to driver demand for power will optimize driveline efficiency and performance without exceeding power limits for the engine and the battery. - View Dependent Claims (10, 11, 12)
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13. A closed-loop power control system for a powertrain for a hybrid electric vehicle comprising:
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a driver controlled engine, a battery, a motor, gearing, and a generator defining an electric drive system, the engine being connected drivably to the generator;
a geared torque flow path defined by the electric drive system extending to vehicle traction wheels, a torque input element of the gearing being connected to the motor; and
a vehicle system controller for coordinating power distribution from the engine and the battery using a closed-loop calculation of optimum actual allowed driver power demand with actual battery power as a feedback variable to effect optimal powertrain performance within predefined battery power charging and discharging limits. - View Dependent Claims (14, 15)
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16. A closed-loop power control system for a powertrain for a hybrid electric vehicle comprising:
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a driver controlled engine, a battery, a motor, gearing and a generator defining an electric drive system;
a planetary gear unit having a sun gear, a ring gear and a planetary carrier, the engine being connected to the carrier and the sun gear being connected to the generator;
a geared torque flow path defined by the electric drive system extending to vehicle traction wheels, a torque input element of the gearing being connected to the motor;
a vehicle system controller for coordinating power distribution from the engine and the battery to effect optimal powertrain performance within predefined battery power charging and discharging limits;
the vehicle system controller including a battery power limiter for receiving the driver demand for power and for limiting a battery power request, an engine power limiter for receiving the driver demand for power and for limiting an engine power command; and
a closed-loop control means for developing a modified battery power desired using actual battery power as a feedback variable whereby an actual allowed driver power demand is developed. - View Dependent Claims (17, 18)
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Specification