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 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;
- 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 greater than the target value; and
operating the powertrain using solely the generator and the battery as a power source with the engine off when the state-of-charge is greater than the high value.
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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
10 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, 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;
- 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 greater than the target value; and
operating the powertrain using solely the generator and the battery as a power source with the engine off when the state-of-charge is greater than the high value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- the method comprising the steps of;
Specification