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US 2012/0234133 A1Published application
Vehicle driving system
AssigneeHonda Motor Co., Ltd.
InventorsTakefumi Ikegami, Shigetaka Kuroda, Masahiro Takeuchi
Life of this patent
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Abstract
In a twin-clutch type transmission in which an electric motor is connected to one of transmission shafts, when downshifting is executed during EV running, a braking force is ensured by controlling in a cooperative fashion a regenerative brake and wheel brakes B1 to B4 so as to compensate for the loss of braking force during downshifting by the wheel brakes B1 to B4 or a braking force is ensured by making use of engine braking effects.
Claims8
A vehicle driving system comprising an internal combustion engine and an electric motor, the system comprising:
- an internal combustion engine output shaft by which power is outputted from the internal combustion engine;
- a first input shaft which is disposed parallel to the internal combustion engine output shaft and which is selectively connected to the internal combustion engine output shaft by a first engaging and disengaging unit;
- a second input shaft which is disposed parallel to the internal combustion engine output shaft and which is selectively connected to the internal combustion engine output shaft by a second engaging and disengaging unit;
- an output/input shaft which is disposed parallel to the internal combustion engine output shaft and which outputs power to a driven portion;
- a first gear group which is disposed on the first input shaft and which includes a plurality of gears which are selectively connected to the first input shaft via a first changeover unit;
- a second gear group which is disposed on the second input shaft and which includes a plurality of gears which are selectively connected to the second input shaft via a second changeover unit;
- and
- a third gear group which is disposed on the output/input shaft and which includes a plurality of gears with which the gears of the first gear group and the gears of the second gear group mesh,
- wherein, when the vehicle is decelerated during an EV running by selecting a high-speed side gear of the first gear group, a braking force during a downshift is ensured by actuating wheel brakes in a cooperative fashion so as to compensate for a reduction in regenerative braking force of the electric motor during a downward gear change from the high-speed side gear to a low-speed side gear while regeneration is brought about by the electric motor.
6 more elements
A vehicle driving system comprising an internal combustion engine and an electric motor, the system comprising:
- an internal combustion engine output shaft by which power is outputted from the internal combustion engine;
- a first input shaft which is disposed parallel to the internal combustion engine output shaft and which is selectively connected to the internal combustion engine output shaft by a first engaging and disengaging unit;
- a second input shaft which is disposed parallel to the internal combustion engine output shaft and which is selectively connected to the internal combustion engine output shaft by a second engaging and disengaging unit;
- an output/input shaft which is disposed parallel to the internal combustion engine output shaft and which outputs power to a driven portion;
- a first gear group which is disposed on the first input shaft and which includes a plurality of gears which are selectively connected to the first input shaft via a first changeover unit;
- a second gear group which is disposed on the second input shaft and which includes a plurality of gears which are selectively connected to the second input shaft via a second changeover unit;
- and
- a third gear group which is disposed on the output/input shaft and which includes a plurality of gears with which the gears of the first gear group and the gears of the second gear group mesh,
- wherein, when the vehicle is decelerated during an EV running by selecting a high-speed side gear of the first gear group, a braking force during a downshift is ensured by making use of engine braking effects by engaging the second engaging and disengaging unit in such a state that the internal combustion engine is started and one of the gears of the second gear group is selected by the second changeover unit during a downward gear change from the high-speed side gear to a low-speed side gear while regeneration is brought about by the electric motor.
6 more elements
Dependencies are inferred from the claim text.