HYBRID VEHICLE POWERTRAIN WITH IMPROVED REVERSE DRIVE PERFORMANCE
First Claim
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1. A hybrid-electric wheeled vehicle powertrain comprising an internal combustion engine, an electric motor, an electric generator and a battery;
- the electric motor, the electric generator and the battery being electrically connected to form an electrical power source;
a geared transmission defining power flow paths to vehicle traction wheels, the geared transmission having a first element connected drivably to the engine and a second element connected drivably to the motor;
a rotor for the generator being connected to a third element of the geared transmission; and
a reaction brake for anchoring the second element of the geared transmission as the engine drives the electric generator during operation of the powertrain in a reverse driving power delivery mode, the electric motor being drivably connected through the geared transmission to the vehicle wheels;
the driving connection of the second element of the geared transmission to the motor comprising a clutch between the second element of the geared transmission and a torque output element of the powertrain whereby the motor, with the clutch disengaged, is isolated from the second element during reverse drive;
the reaction brake for anchoring the second element of the geared transmission being released and the clutch being engaged during operation of the powertrain in a split-power delivery mode in a forward vehicle driving direction.
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Abstract
A hybrid-electric powertrain for a wheeled vehicle having an internal combustion engine, an electric generator, an electric motor and a battery. Transmission gearing establishes multiple torque flow paths including a forward drive torque flow path and a reverse drive torque flow path, the motor being isolated from forward drive gearing elements as it acts as a sole reverse drive power source.
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Citations
11 Claims
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1. A hybrid-electric wheeled vehicle powertrain comprising an internal combustion engine, an electric motor, an electric generator and a battery;
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the electric motor, the electric generator and the battery being electrically connected to form an electrical power source; a geared transmission defining power flow paths to vehicle traction wheels, the geared transmission having a first element connected drivably to the engine and a second element connected drivably to the motor; a rotor for the generator being connected to a third element of the geared transmission; and a reaction brake for anchoring the second element of the geared transmission as the engine drives the electric generator during operation of the powertrain in a reverse driving power delivery mode, the electric motor being drivably connected through the geared transmission to the vehicle wheels; the driving connection of the second element of the geared transmission to the motor comprising a clutch between the second element of the geared transmission and a torque output element of the powertrain whereby the motor, with the clutch disengaged, is isolated from the second element during reverse drive; the reaction brake for anchoring the second element of the geared transmission being released and the clutch being engaged during operation of the powertrain in a split-power delivery mode in a forward vehicle driving direction. - View Dependent Claims (4, 6, 7, 9)
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2. A hybrid-electric wheeled vehicle powertrain comprising an internal combustion engine, an electric motor, an electric generator and a battery;
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the electric motor, the electric generator and the battery being electrically connected to form an electrical power source, a geared transmission defining power flow paths to vehicle traction wheels, the geared transmission having a first element connected drivably to the engine and a second element connected drivably to the vehicle traction wheels; a rotor for the generator being connected to a third element of the geared transmission; and a first clutch selectively connecting two elements of the geared transmission thereby establishing a direct drive between the engine and the electric generator as the engine drives the electric generator during operation of the powertrain in a reverse vehicle driving direction, the electric motor being drivably coupled through the geared transmission to the vehicle wheels; the driving connection of the second element of the geared transmission to the vehicle traction wheels comprising a second clutch between the electric motor and the gear elements of the geared transmission, the second clutch being disengaged and the first clutch being engaged during reverse drive operation whereby the engine drives the generator to charge the battery through a torque flow path that is isolated from a reverse drive motor torque flow path. - View Dependent Claims (3, 5, 8, 10)
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11. A hybrid-electric wheeled vehicle powertrain comprising an internal combustion engine, an electric motor, an electric generator and a battery;
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the electric motor, the electric generator and the battery being electrically connected to form an electrical power source; a geared transmission defining power flow paths to vehicle traction wheels, the geared transmission having a first gear element connected to the engine and a second gear element connected drivably to the motor; a rotor for the generator being connected to a third element of the geared transmission; means for establishing a driving connection between the engine and the generator through the gear elements during operation of the powertrain in a reverse driving power delivery mode, the electric motor being drivably connected to the vehicle traction wheels; and means for isolating a torque flow path between the motor and the vehicle traction wheels from a torque flow path between the engine and the generator.
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Specification