Electric hybrid powertrain system
First Claim
Patent Images
1. A hybrid electric vehicle powertrain comprising an engine, an electric motor, an electric generator, a battery and gearing defining power flow paths between the motor and vehicle traction wheels and between the engine and the vehicle traction wheels;
- the gearing including a gear unit having at least one power input gear element, a power output gear element and a reaction gear element, the power input gear element being in the power flow path between the engine and first vehicle traction wheels, the power output gear element being connected drivably to the first vehicle traction wheels; and
a clutch and brake assembly for establishing forward drive gearing ratios and one reverse drive gearing ratio in the gear unit;
the motor being mechanically connected to second vehicle traction wheels;
the generator, the motor and the battery being electrically coupled in the power flow path between the motor and the traction wheels;
the gearing further including a powersplit planetary gearset having one gearset element connected to the engine, a second gearset element connected to the generator and a third gearset element connected by the clutch and brake assembly to the at least one power input element of the gear unit.
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Abstract
A hybrid electric vehicle powertrain having an engine and an electric motor and generator sub-system, which establish mechanical and electric power flow paths. Multiple-ratio gearing in a power flow path for forward drive enhances vehicle traction torque for heavy-duty vehicle applications. Reverse drive performance is enhanced by torque multiplying gearing in a reverse drive power delivery path.
122 Citations
17 Claims
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1. A hybrid electric vehicle powertrain comprising an engine, an electric motor, an electric generator, a battery and gearing defining power flow paths between the motor and vehicle traction wheels and between the engine and the vehicle traction wheels;
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the gearing including a gear unit having at least one power input gear element, a power output gear element and a reaction gear element, the power input gear element being in the power flow path between the engine and first vehicle traction wheels, the power output gear element being connected drivably to the first vehicle traction wheels; and a clutch and brake assembly for establishing forward drive gearing ratios and one reverse drive gearing ratio in the gear unit; the motor being mechanically connected to second vehicle traction wheels; the generator, the motor and the battery being electrically coupled in the power flow path between the motor and the traction wheels; the gearing further including a powersplit planetary gearset having one gearset element connected to the engine, a second gearset element connected to the generator and a third gearset element connected by the clutch and brake assembly to the at least one power input element of the gear unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A hybrid electric powertrain for a vehicle having front and rear traction wheels comprising an engine, an electric motor, an electric generator, a battery and gearing defining power flow paths between the engine and a first power output shaft and between the motor and a second power output shaft
the gearing including a gear unit and a powersplit planetary gearset, the gear unit comprising a power input gear element and a reaction gear element, the power input gear element being in a power flow path between the engine and the vehicle rear traction wheels, a power output element of the gear unit being connected drivably to the rear traction wheels through the first power output shaft; - and
a clutch and brake assembly for establishing two forward drive gearing ratios and one reverse drive gearing ratio in the power flow path for the engine; the generator, the motor and the battery being electrically coupled by the planetary gearset in the power flow path between the motor and the front traction wheels through the second power output shaft the power flow path between the motor and the front traction wheels including a front wheel driveshaft extending in a direction offset from and parallel to an axis for the gearing; the gear unit being a compound planetary gear unit with two compound planetary gear unit power input elements; the clutch and brake assembly having selectively engageable clutches for connecting separately a gearset element to of the powersplit gearest to the two compound planetary gear unit power input elements. - View Dependent Claims (9, 10, 11, 12, 13, 16, 17)
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14. A hybrid electric powertrain for a vehicle having front and rear traction wheels comprising an engine, an electric motor, an electric generator, a battery and gearing defining power flow paths between the engine and a first power output shaft and between the motor and a second power output shaft;
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the gearing having at least one power input gear element and a reaction gear element, the power input element being in the power flow path between the engine and vehicle rear traction wheels, a power output element of the gearing being connected drivably to the rear traction wheels through the first power output shaft; and a clutch and brake assembly for establishing two forward drive gearing ratios and one reverse drive gearing ratio; the motor being connected drivably to front traction wheels through the second power output shaft; the generator, the motor and the battery being electrically coupled in the power flow path between the motor and front traction wheels; the power flow paths between the engine and the rear traction wheels and between the motor and the front traction wheels are braking power delivery paths from the traction wheel whereby the motor acts as a generator and stores electrical energy in the battery; and a disconnect clutch in the braking power delivery path from the front traction wheels for disconnecting the rear traction wheels from the front traction wheels if braking power from the front traction wheels exceeds braking power from the rear traction wheels whereby skidding of the rear traction wheels is avoided during vehicle braking. - View Dependent Claims (15)
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Specification