A CONTROLLER AND CONTROL METHOD FOR A HYBRID ELECTRIC VEHICLE POWERTRAIN
First Claim
1. A method for controlling a hybrid electric vehicle powertrain having an internal combustion engine, a battery, an electric generator, an electric motor and a geared transmission, the geared transmission establishing a torque flow path from the engine to a torque output shaft, the method comprising the steps of:
- determining desired input torque, vehicle speed and the state-of-charge of the battery;
determining whether the state-of-charge is less than a predetermined high value above which charging of the battery is not allowable;
determining whether the state-of-charge is greater than a predetermined target value;
operating the powertrain in a positive split mode when the state-of-charge is less than the high value and greater than the target value; and
operating the powertrain in a generator drive mode with the engine off when the state-of-charge is greater than the high value.
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Accused Products
Abstract
A parallel hybrid electric vehicle powertrain and control method wherein an internal combustion engine and an electric motor system define a split power operating mode, a generator drive mode and a parallel power mode. Provision is made, when the motor is inoperable, for preventing discharge of a battery in the electric motor system when the battery state-of-charge is low and for delivering power from the battery when the battery state-of-charge is greater than a predetermined value.
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Citations
12 Claims
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1. A method for controlling a hybrid electric vehicle powertrain having an internal combustion engine, a battery, an electric generator, an electric motor and a geared transmission, the geared transmission establishing a torque flow path from the engine to a torque output shaft, the method comprising the steps of:
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determining desired input torque, vehicle speed and the state-of-charge of the battery;
determining whether the state-of-charge is less than a predetermined high value above which charging of the battery is not allowable;
determining whether the state-of-charge is greater than a predetermined target value;
operating the powertrain in a positive split mode when the state-of-charge is less than the high value and greater than the target value; and
operating the powertrain in a generator drive mode with the engine off when the state-of-charge is greater than the high value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10, 11, 12)
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8. A powertrain control system for a hybrid electric vehicle comprising an internal combustion engine, a battery, an electric generator, an electric motor and planetary gearing;
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the planetary gearing including a sun gear connected to the generator, a ring gear drivably connected to a torque output shaft, and a planetary carrier connected to the engine;
a first brake for preventing rotation of the generator to condition the powertrain for a parallel operating power mode;
a second brake for preventing rotation of the planetary carrier to condition the powertrain for operation in a generator drive mode;
the generator being electrically coupled to the motor and the battery and the motor being drivably connected to the torque output shaft; and
a vehicle powertrain controller for detecting the state-of-charge of the battery and the vehicle speed;
the controller setting the powertrain for parallel power operating mode when the state-of-charge is greater than a target value and the vehicle speed is less than a maximum value;
the controller setting the powertrain for operation in generator drive mode when the state-of-charge is greater than a predetermined high value and the vehicle speed is less than the maximum value. - View Dependent Claims (9)
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Specification