Controller and control method for a hybrid electric vehicle powertrain
First Claim
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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 transmission gearing;
- the battery, the motor and the generator being electrically coupled to define an electrical driving power source;
the engine defining a mechanical power source;
the generator being drivably connected to a first element of the gearing and the engine being drivably connected to a second element of the gearing to define separate power flow paths through the gearing to vehicle traction wheels;
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 using both the engine and the electrical power source when the state-of-charge is less than the high value and less than the target value; and
operating the powertrain using solely the motor, the generator and the battery as a power source with the engine off when the state-of-charge is greater than the high value;
operating the powertrain using both the engine and the electrical power source when the vehicle speed is greater than a maximum value and the state-of-charge is less than the target value; and
using solely the engine, the battery and the motor as a power source when the state-of-charge is greater than the target value;
the generator being braked to condition the powertrain for operation with the engine, the battery and the motor as a power source.
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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
5 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 transmission gearing;
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the battery, the motor and the generator being electrically coupled to define an electrical driving power source; the engine defining a mechanical power source; the generator being drivably connected to a first element of the gearing and the engine being drivably connected to a second element of the gearing to define separate power flow paths through the gearing to vehicle traction wheels; 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 using both the engine and the electrical power source when the state-of-charge is less than the high value and less than the target value; and operating the powertrain using solely the motor, the generator and the battery as a power source with the engine off when the state-of-charge is greater than the high value; operating the powertrain using both the engine and the electrical power source when the vehicle speed is greater than a maximum value and the state-of-charge is less than the target value; and using solely the engine, the battery and the motor as a power source when the state-of-charge is greater than the target value; the generator being braked to condition the powertrain for operation with the engine, the battery and the motor as a power source.
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2. A method for controlling a hybrid electric vehicle powertrain having an internal combustion engine, a battery, an electric generator, an electric motor and transmission gearing;
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the battery, the motor and the generator being electrically coupled to define an electrical driving power source; the engine defining a mechanical power source; the generator being drivably connected to a first element of the gearing and the engine being drivably connected to a second element of the gearing to define separate power flow paths through the gearing to vehicle traction wheels; 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 using both the engine and the electrical power source when the state-of-charge is less than the high value and less than the target value; and operating the powertrain using solely the motor, the generator and the battery as a power source with the engine off when the state-of-charge is greater than the high value; wherein, during operation using both the engine and the electrical power source, a desired engine torque is a function of at least in part, of driver torque demand, and a desired engine speed is a function, at least in part, of vehicle speed and battery charging power.
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3. A method for controlling a hybrid electric vehicle powertrain having an internal combustion engine, a battery, an electric generator, an electric motor and transmission gearing;
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the battery, the motor and the generator being electrically coupled to define an electrical driving power source; the engine defining a mechanical power source; the generator being drivably connected to a first element of the gearing and the engine being drivably connected to a second element of the gearing to define separate power flow paths through the gearing to vehicle traction wheels; 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 using both the engine and the electrical power source when the state-of-charge is less than the high value and less than the target value; and operating the powertrain using solely the motor, the generator and the battery as a power source with the engine off when the state-of-charge is greater than the high value; wherein, during operation of the powertrain using the engine, the battery and the motor as a sole power source, a desired engine torque is a function, at least in part, of driver torque demand, and a desired engine speed is a function, at least in part, of vehicle speed.
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4. A method for controlling a hybrid electric vehicle powertrain having an internal combustion engine, a battery, an electric generator, an electric motor and transmission gearing;
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the battery, the motor and the generator being electrically coupled to define an electrical driving power source; the engine defining a mechanical power source; the generator being drivably connected to a first element of the gearing and the engine being drivably connected to a second element of the gearing to define separate power flow paths through the gearing to vehicle traction wheels; 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 using both the engine and the electrical power source when the state-of-charge is less than the high value and less than the target value; and operating the powertrain using solely the motor, the generator and the battery as a power source with the engine off when the state-of-charge is greater than the high value; wherein, during operation of the powertrain using the engine, the battery and the motor as a power source, a desired generator torque is a function, at least in part, of driver torque demand.
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5. A method for controlling a hybrid electric vehicle powertrain having an internal combustion engine, a battery, an electric generator, an electric motor and transmission gearing;
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the battery, the motor and the generator being electrically coupled to define an electrical driving power source; the engine defining a mechanical power source; the generator being drivably connected to a first element of the gearing and the engine being drivably connected to a second element of the gearing to define separate power flow paths through the gearing to vehicle traction wheels; 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 using both the engine and the electrical power source when the state-of-charge is less than the high value and less than the target value; operating the powertrain using solely the motor, the generator and the battery as a power source with the engine off when the state-of-charge is greater than the high value; and operating the powertrain in a parallel drive mode using solely the engine, the battery and the motor.
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Specification