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;
perform mode switching from the hybrid drive mode to the electric drive mode by reducing the torque transfer capacity of the second clutch, then initiating a stop of the engine, and then disengaging the first clutch; and
disengage the first clutch after an engine torque set during operation of the engine reaches substantially zero as a result of completing the stop of the engine, based on an elapsed time measured from a moment when a mode switching command for switching from the hybrid drive mode to the electric drive mode is issued.
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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
16 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; perform mode switching from the hybrid drive mode to the electric drive mode by reducing the torque transfer capacity of the second clutch, then initiating a stop of the engine, and then disengaging the first clutch; and
disengage the first clutch after an engine torque set during operation of the engine reaches substantially zero as a result of completing the stop of the engine, based on an elapsed time measured from a moment when a mode switching command for switching from the hybrid drive mode to the electric drive mode is issued. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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, a driving wheel, and an automatic transmission disposed between the motor-generator and the 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 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; performing mode switching from the hybrid drive mode to the electric drive mode by reducing the torque transfer capacity of the second clutch, then initiating a stop of the engine, and then disengaging the first clutch; and
wherein performing the mode switching further includesgear shifting the automatic transmission by disengaging a first transmission friction element of the automatic transmission and engaging a second transmission element of the automatic transmission, wherein the first transmission friction element is the second clutch. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification