Hybrid vehicle
First Claim
1. A hybrid vehicle in which an engine is connected to first driven wheels through a first motor/generator and a transmission, and a second motor/generator is connected to second driven wheels, said first and second motors/generators being connected to an accumulating means, wherein a distribution ratio of braking forces to the first and second motors/generators is controlled to become an ideal distribution ratio corresponding to a longitudinal acceleration of the vehicle during regenerative braking of the vehicle, wherein the first and second driven wheels are front and rear wheels, respectively, and when the vehicle is traveling down a slope, the distribution ratio of the regenerative braking force to the second motor/generator is decreased to be smaller than the ideal distribution ratio.
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Accused Products
Abstract
In a hybrid vehicle, an engine is connected to front wheels through a first motor/generator and a transmission, and a second motor/generator is connected to rear wheels. The first and second motors/generators are connected to a battery so that they are driven or regenerated. During regenerative braking of the vehicle, the distribution ratio of regenerative braking forces to the first and second motors/generators is controlled to become an ideal distribution ratio corresponding to a longitudinal acceleration (deceleration) of the vehicle, whereby the distribution ratio of the braking forces to the front and rear wheels can be always maintained at an optimal value during rapid deceleration as well as during slow deceleration of the vehicle, to improve the braking performance.
58 Citations
16 Claims
- 1. A hybrid vehicle in which an engine is connected to first driven wheels through a first motor/generator and a transmission, and a second motor/generator is connected to second driven wheels, said first and second motors/generators being connected to an accumulating means, wherein a distribution ratio of braking forces to the first and second motors/generators is controlled to become an ideal distribution ratio corresponding to a longitudinal acceleration of the vehicle during regenerative braking of the vehicle, wherein the first and second driven wheels are front and rear wheels, respectively, and when the vehicle is traveling down a slope, the distribution ratio of the regenerative braking force to the second motor/generator is decreased to be smaller than the ideal distribution ratio.
- 4. A hybrid vehicle in which an engine is connected to first driven wheels through a first motor/generator and a transmission, and a second motor/generator is connected to second driven wheels, said first and second motors/generators being connected to an accumulating means, wherein a distribution ratio of braking forces to the first and second motors/generators is controlled to become an ideal distribution ratio corresponding to a longitudinal acceleration of the vehicle during regenerative braking of the vehicle, wherein the first and second driven wheels are front and rear wheels, respectively, and when a lateral acceleration of the vehicle exceeds a predetermined value and a vehicle speed exceeds a predetermined value, the distribution ratio of the regenerative braking force to the second motor/generator is decreased to be smaller than said ideal distribution ratio.
- 8. A hybrid vehicle in which an engine is connected to first driven wheels through a first motor/generator and a transmission, and a second motor/generator is connected to second driven wheels, said first and second motors/generators being connected to an accumulating means, wherein a distribution ratio of braking forces to the first and second motors/generators is controlled to become an ideal distribution ratio corresponding to a longitudinal acceleration of the vehicle during regenerative braking of the vehicle, wherein the first and second wheels are front and rear wheels, respectively, and when a yaw rate of the vehicle exceeds a predetermined value, the distribution ratio of the regenerative braking force to the second motor/generator is decreased to be smaller than said ideal distribution ratio.
- 10. A hybrid vehicle in which an engine is connected to first driven wheels through a first motor/generator and a transmission, and a second motor/generator is connected to second driven wheels, said first and second motors/generators being connected to an accumulating means, wherein a distribution ratio of braking forces to the first and second motors/generators is controlled to become an ideal distribution ratio corresponding to a longitudinal acceleration of the vehicle during regenerative braking of the vehicle, wherein, during operation of a mechanical brake, a braking force for the second driven wheels determined depending on said ideal distribution ratio is generated by the second motor/generator and the mechanical brake, and a deficiency of the regenerative braking force for the second motor/generator limited by the remaining capacity of the accumulating means is made up by a braking force of the mechanical brake.
- 13. A hybrid vehicle in which an engine is connected to first driven wheels through a first motor/generator and a transmission, and a second motor/generator is connected to second driven wheels, said first and second motors/generators being connected to an accumulating means, wherein a distribution ratio of braking forces to the first and second motors/generators is controlled to become an ideal distribution ratio corresponding to a longitudinal acceleration of the vehicle during regenerative braking of the vehicle, wherein the engine is constructed so that the rotational resistance can be decreased by the stopping of cylinders, and when the engine is brought into a cylinder-stopped state to regeneratively brake the vehicle, if the remaining capacity of the accumulating means exceeds a predetermined value, the cylinder-stopped state of the engine is canceled, and the first motor/generator is driven by an electric power generated by the second motor/generator so that an increment in rotational resistance of the engine due to the cancellation of the cylinder-stopped state is countervailed.
- 15. A hybrid vehicle in which an engine is connected to first driven wheels through a first motor/generator and a transmission, and a second motor/generator is connected to second driven wheels, said first and second motors/generators being connected to an accumulating means, wherein a distribution ratio of braking forces to the first and second motors/generators is controlled to become an ideal distribution ratio corresponding to a longitudinal acceleration of the vehicle during regenerative braking of the vehicle, wherein the first and second driven wheels are front and rear wheels, respectively, and the distribution ratio of the regenerative braking force to the second motor/generator is increased in accordance with a decrease in a road surface friction coefficient.
Specification