Drive state shift control apparatus and method for vehicle
First Claim
1. A drive state shift control apparatus for a vehicle, comprising:
- a motor-generator;
a unidirectional engagement element disposed between the motor-generator and the driving wheel configured for automatic engagement in response to driving torque in one direction; and
a controller operable to;
control a rotational speed of the motor-generator so that a rotational speed of an upstream side of the unidirectional engagement element in a direction of driving power transmission substantially conforms to a rotational speed of a downstream side thereof when a difference between the rotational speeds is ±
α
wherein α
is a predetermined number greater than zero when the unidirectional engagement element is engaged in response to a shift in a driving power transmission path; and
gradually control the difference toward zero.
1 Assignment
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Accused Products
Abstract
A drive state shift control apparatus and method switches a hybrid drive (HEV) mode to an electric drive (EV) mode without engine stoppage shock or eliminates gearshifting shock in an electric vehicle. In response to a decrease in accelerator opening APO, a request for fourth-to-fifth upshift is issued, then request for HEV-to-EV mode shift is issued. At the time of the upshift, a direct clutch D/C is disengaged. At a first time interval after the mode shift is issued, a first clutch is disengaged. At a second time interval after the mode shift is issued, the engine begins to stop and the rotational speed of the motor-generator is controlled so that the speed falls to a predetermined rotational speed close to an after-gearshift rotational speed within a target shifting time interval. When the rotational speed reaches the predetermined rotational speed, a front brake Fr/B is engaged to perform a fourth-to-fifth upshift, and the torque of the motor is controlled so as to engage the one-way clutch smoothly.
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Citations
19 Claims
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1. A drive state shift control apparatus for a vehicle, comprising:
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a motor-generator; a unidirectional engagement element disposed between the motor-generator and the driving wheel configured for automatic engagement in response to driving torque in one direction; and a controller operable to; control a rotational speed of the motor-generator so that a rotational speed of an upstream side of the unidirectional engagement element in a direction of driving power transmission substantially conforms to a rotational speed of a downstream side thereof when a difference between the rotational speeds is ±
α
wherein α
is a predetermined number greater than zero when the unidirectional engagement element is engaged in response to a shift in a driving power transmission path; andgradually control the difference toward zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A controller for a drive state shift control apparatus for a vehicle, the vehicle including a motor-generator, a driving wheel and a clutch disposed between the motor-generator and a driving wheel for engagement and disengagement, the controller comprising:
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means for shifting a driving power transmission path; means for shifting the clutch into a disengaged state from an engaged state transmitting a driving torque responsive to an upshift at a time of a release of an accelerator pedal; and means for controlling a rotational speed of the motor-generator so that a rotational speed of an upstream side of a unidirectional engagement element in a direction of driving power transmission substantially conforms to a rotational speed of a downstream side thereof when the unidirectional engagement element is engaged in response to a shift in the driving power transmission path after the clutch is shifted into the disengaged state, the unidirectional engagement element disposed between the motor-generator and the driving wheel configured for automatic engagement in response to driving torque in one direction.
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18. A drive state shift control method for a vehicle, the vehicle including a motor-generator and a driving wheel, the method comprising:
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shifting a driving power transmission path; controlling a rotational speed of the motor-generator so that a rotational speed of an upstream side of a unidirectional engagement element in a direction of driving power transmission substantially conforms to a rotational speed of a downstream side thereof when a difference between the rotational speeds is ±
α
wherein α
is a predetermined number greater than zero when the unidirectional engagement element is engaged in response to shifting the driving power transmission path, the unidirectional engagement element disposed between the motor-generator and the driving wheel configured for automatic engagement in response to driving torque in one direction; andgradually controlling the difference toward zero. - View Dependent Claims (19)
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Specification