Controller and control method for a hybrid electric vehicle powertrain
First Claim
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1. A hybrid electric vehicle powertrain comprising an internal combustion engine, a battery, an electric generator, an electric motor and planetary gearing;
- the planetary gearing including a first gearing element drivably connected to the generator, a second gearing element drivably connected to a torque output shaft, and a third gearing element drivably connected to the engine;
a first brake for preventing rotation of the generator to condition the powertrain for a parallel operating power mode;
means for preventing rotation of the third gearing element to condition the powertrain for operation in a generator drive mode;
the generator being electrically coupled to the motor and the battery, the motor being drivably connected to the torque output shaft; and
a vehicle powertrain controller including means for detecting the state-of-the-charge of the battery and the vehicle speed;
the controller being configured to set the powertrain for operation in a parallel drive mode when the state-of-charge is greater than a target value and the vehicle speed is less than a predetermined maximum value;
the controller being configured to set the powertrain for operation in a generator drive mode when the state-of-charge is greater than a predetermined high value and the vehicle speed is less than the predetermined maximum value;
the controller being configured to set the powertrain for operation in a parallel drive mode when the vehicle speed is greater than the predetermined maximum value and the state-of-charge is greater than a target value, and for operation in a power split drive mode when the vehicle speed is greater than the predetermined maximum value and the state-of-charge is less than the target 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
6 Claims
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1. A hybrid electric vehicle powertrain 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 first gearing element drivably connected to the generator, a second gearing element drivably connected to a torque output shaft, and a third gearing element drivably connected to the engine; a first brake for preventing rotation of the generator to condition the powertrain for a parallel operating power mode; means for preventing rotation of the third gearing element to condition the powertrain for operation in a generator drive mode; the generator being electrically coupled to the motor and the battery, the motor being drivably connected to the torque output shaft; and a vehicle powertrain controller including means for detecting the state-of-the-charge of the battery and the vehicle speed; the controller being configured to set the powertrain for operation in a parallel drive mode when the state-of-charge is greater than a target value and the vehicle speed is less than a predetermined maximum value; the controller being configured to set the powertrain for operation in a generator drive mode when the state-of-charge is greater than a predetermined high value and the vehicle speed is less than the predetermined maximum value; the controller being configured to set the powertrain for operation in a parallel drive mode when the vehicle speed is greater than the predetermined maximum value and the state-of-charge is greater than a target value, and for operation in a power split drive mode when the vehicle speed is greater than the predetermined maximum value and the state-of-charge is less than the target value.
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2. A hybrid electric vehicle powertrain 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 first gearing element drivably connected to the generator, a second gearing element drivably connected to a torque output shaft, and a third gearing element drivably connected to the engine; a first brake for preventing rotation of the generator to condition the powertrain for a parallel operating power mode; means for preventing rotation of the third gearing element to condition the powertrain for operation in a generator drive mode; the generator being electrically coupled to the motor and the battery, the motor being drivably connected to the torque output shaft; and a vehicle powertrain controller including means for detecting the state-of-the-charge of the battery and the vehicle speed; the controller being configured to set the powertrain for operation in a parallel drive mode when the state-of-charge is greater than a target value and the vehicle speed is less than a predetermined maximum value; the controller being configured to set the powertrain for operation in a generator drive mode when the state-of-charge is greater than a predetermined high value and the vehicle speed is less than the predetermined maximum value; the controller being configured to set the powertrain for operation in a power split drive mode when the vehicle speed is less than a minimum value below which the engine will stall and the state-of-charge is less than a high value, and for operation in a generator drive mode when the vehicle speed is less than the minimum value and the state-of-charge is greater than the high value.
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3. A hybrid electric vehicle powertrain 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 first gearing element drivably connected to the generator, a second gearing element drivably connected to a torque output shaft, and a third gearing element drivably connected to the engine; a first brake for preventing rotation of the generator to condition the powertrain for a parallel operating power mode; means for preventing rotation of the third gearing element to condition the powertrain for operation in a generator drive mode; the generator being electrically coupled to the motor and the battery, the motor being drivably connected to the torque output shaft; and a vehicle powertrain controller including means for detecting the state-of-the-charge of the battery and the vehicle speed; the controller being configured to set the powertrain for operation in a parallel drive mode when the state-of-charge is greater than a target value and the vehicle speed is less than a predetermined maximum value; the controller being configured to set the powertrain for operation in a generator drive mode when the state-of-charge is greater than a predetermined high value and the vehicle speed is less than the predetermined maximum value; the controller being configured to set the powertrain for operation in a power split mode when the vehicle speed is less than a minimum below which the engine will stall and the state-of-charge is less than the target value, and for operation in the generator drive mode when the vehicle speed is less than the minimum value and the state-of-charge is less than the target value. - View Dependent Claims (4, 5, 6)
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Specification