Controlling device and method for hybrid vehicle
First Claim
1. A controlling device for a hybrid vehicle, comprising:
- an engine;
a motor-generator;
a first clutch whose torque transfer capacity is changeable between the engine and the motor-generator;
a second clutch whose torque transfer capacity is changeable between the motor-generator and a driving wheel; and
a controller configured to;
control a selection between an electric drive mode, in which the hybrid vehicle travels by using the motor-generator while the first clutch is disengaged and the second clutch is engaged, and a hybrid drive mode, in which the hybrid vehicle travels by at least driving force of the engine while the first clutch and the second clutch are engaged; and
perform mode switching from the hybrid drive mode to the electric drive mode by reducing the torque transfer capacity of the second clutch to stop the engine and by disengaging the first clutch responsive to reducing the torque transfer capacity of the second clutch.
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Accused Products
Abstract
A mode switching controlling device and method switches a hybrid drive (HEV) mode to an electric drive (EV) mode without engine stoppage shock. A fourth-to-fifth speed upshifting command is generated due to reduction in an accelerator opening. Then, an HEV-to-EV-mode switching command is generated. A command pressure of a direct clutch is set to 0, and an actual-pressure reduction disengages the direct clutch, causing an automatic transmission to be in a neutral state. When a first time elapses from generation of the switching command, a first clutch command pressure is set to its maximum value, and the first clutch disengages by an actual pressure increase. When a second time elapses, the engine is stopped by reducing engine torque to perform mode switching. A front brake command pressure is set to a precharge pressure when the second time elapses and to its maximum value at a later time when a gear-switching rotation matching controlling operation of a motor-generator is ended, so that the front brake is engaged due to an actual pressure increase for upshifting from the fourth to fifth speed.
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Citations
18 Claims
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1. A controlling device for a hybrid vehicle, comprising:
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an engine; a motor-generator; a first clutch whose torque transfer capacity is changeable between the engine and the motor-generator; a second clutch whose torque transfer capacity is changeable between the motor-generator and a driving wheel; and a controller configured to; control a selection between an electric drive mode, in which the hybrid vehicle travels by using the motor-generator while the first clutch is disengaged and the second clutch is engaged, and a hybrid drive mode, in which the hybrid vehicle travels by at least driving force of the engine while the first clutch and the second clutch are engaged; and perform mode switching from the hybrid drive mode to the electric drive mode by reducing the torque transfer capacity of the second clutch to stop the engine and by disengaging the first clutch responsive to reducing the torque transfer capacity of the second clutch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A controlling device for a hybrid vehicle, comprising:
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an engine; a motor-generator; first means for changing a torque transfer capacity between the engine and the motor-generator; second means for changing a torque transfer capacity between the motor-generator and a driving wheel; means for controlling a selection between an electric drive mode, in which the hybrid vehicle travels by using the motor-generator while the first changing means is disengaged and the second changing means is engaged, and a hybrid drive mode, in which the hybrid vehicle travels by at least driving force of the engine when the first changing means and the second changing means are engaged; and means for performing mode switching from the hybrid drive mode to the electric drive mode by reducing the torque transfer capacity of the second changing means to stop the engine and by disengaging the first changing means responsive to reducing the torque transfer capacity of the second changing means.
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12. A method for controlling a hybrid vehicle, the hybrid vehicle including an engine, a motor-generator, a first clutch with a torque transfer capacity changeable between the engine and the motor-generator, a second clutch with a torque transfer capacity changeable between the motor-generator and a driving wheel, the method comprising:
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controlling a selection between an electric drive mode, in which the hybrid vehicle travels by using the motor-generator while the first clutch is disengaged and the second clutch is disengaged, and a hybrid drive mode, in which the hybrid vehicle travels by at least driving force of the engine while the first clutch and the second clutch are engaged; and performing mode switching from the hybrid drive mode to the electric drive mode by reducing the torque transfer capacity of the second clutch to stop the engine and by disengaging the first clutch responsive to reducing the torque transfer capacity of the second clutch. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification