System for controlling four-wheel drive for motor vehicle
First Claim
1. A system for controlling a four-wheel drive for a motor vehicle provided with main and secondary driving wheels, comprising:
- means for detecting a drive mode of the motor vehicle, said drive mode being selectable between a two-wheel drive mode and a four-wheel drive mode, said four-wheel drive mode being selectable between a direct-coupled four-wheel drive mode with distribution of traction between the main and secondary driving wheels being in a ratio of 1;
1, and an auto four-wheel drive mode where a state of the motor vehicle is automatically continuously changeable between said two-wheel drive mode and said direct-coupled four-wheel drive mode;
means, in response to said drive mode detecting means, for controlling distribution of traction between the main and secondary driving wheels, said distribution controlling means comprising a changeover switch, which serves to select said drive mode, having a contact of said auto four-wheel drive mode that is positioned between contacts of said two-wheel drive mode and said direct-coupled four-wheel drive mode so as to pass said auto four-wheel drive mode when switching from said two-wheel drive mode to said direct-coupled four-wheel drive mode; and
means, in response to said distribution controlling means, for distributing traction between the main and secondary driving wheels, said traction distributing means including a friction clutch and a solenoid,wherein said distribution controlling means comprises;
means for determining a time elapsed during switching from said auto four-wheel drive mode to said two-wheel drive mode;
means, in response to said time determining means, for continuing said auto four-wheel drive mode during a predetermined period without shifting to said two-wheel drive mode;
means for detecting turning of the motor vehicle;
means, in response to said turning detecting means, for setting a time required for switching from said four-wheel drive mode to said two-wheel drive mode; and
means, in response to said time setting means for gradually reducing engaging force of said friction clutch when carrying out switching from said four-wheel drive mode to said two-wheel drive mode.
1 Assignment
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Accused Products
Abstract
A system for controlling a four-wheel drive for a motor vehicle comprises a drive mode switch for detecting a drive mode of the motor vehicle selectable between a two-wheel drive mode and a four-wheel drive mode. The four-wheel drive mode is selectable between a direct-coupled four-wheel drive mode. A an auto four-wheel drive mode, a controller controls the distribution of traction between main and secondary driving wheels. A traction transmission train distributes traction between the main and secondary driving wheels. The traction transmission train has an oil pressure supply system having a friction clutch and a solenoid.
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Citations
34 Claims
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1. A system for controlling a four-wheel drive for a motor vehicle provided with main and secondary driving wheels, comprising:
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means for detecting a drive mode of the motor vehicle, said drive mode being selectable between a two-wheel drive mode and a four-wheel drive mode, said four-wheel drive mode being selectable between a direct-coupled four-wheel drive mode with distribution of traction between the main and secondary driving wheels being in a ratio of 1;
1, and an auto four-wheel drive mode where a state of the motor vehicle is automatically continuously changeable between said two-wheel drive mode and said direct-coupled four-wheel drive mode;means, in response to said drive mode detecting means, for controlling distribution of traction between the main and secondary driving wheels, said distribution controlling means comprising a changeover switch, which serves to select said drive mode, having a contact of said auto four-wheel drive mode that is positioned between contacts of said two-wheel drive mode and said direct-coupled four-wheel drive mode so as to pass said auto four-wheel drive mode when switching from said two-wheel drive mode to said direct-coupled four-wheel drive mode; and means, in response to said distribution controlling means, for distributing traction between the main and secondary driving wheels, said traction distributing means including a friction clutch and a solenoid, wherein said distribution controlling means comprises; means for determining a time elapsed during switching from said auto four-wheel drive mode to said two-wheel drive mode; means, in response to said time determining means, for continuing said auto four-wheel drive mode during a predetermined period without shifting to said two-wheel drive mode; means for detecting turning of the motor vehicle; means, in response to said turning detecting means, for setting a time required for switching from said four-wheel drive mode to said two-wheel drive mode; and means, in response to said time setting means for gradually reducing engaging force of said friction clutch when carrying out switching from said four-wheel drive mode to said two-wheel drive mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A motor vehicle comprising:
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main and secondary driving wheels; means for detecting a drive mode of the motor vehicle, said drive mode being selectable between a two-wheel drive mode and a four-wheel drive mode, said four-wheel drive mode being selectable between a direct-coupled four-wheel drive mode with distribution of traction between said main and secondary driving wheels being in a ratio of 1;
1, and an auto four-wheel drive mode where a state of the motor vehicle is automatically continuously changeable between said two-wheel drive mode and said direct-coupled four-wheel drive mode;means, in response to said drive mode detecting means, for controlling distribution of traction between said main and secondary driving wheels, said distribution controlling means comprising a changeover switch, which serves to select said drive mode, having a contact of said auto four-wheel drive mode that is positioned between contacts of said two-wheel drive mode and said direct-coupled four-wheel drive mode so as to pass said auto four-wheel drive mode when switching from said two-wheel drive mode to said direct-coupled four-wheel drive mode; and means, in response to said distribution controlling means, for distributing traction between said main and secondary driving wheels, said traction distributing means including a friction clutch and a solenoid, wherein said distribution controlling means comprises; means for determining a time elapsed during switching from said auto four-wheel drive mode to said two-wheel drive mode; means, in response to said time determining means, for continuing said auto four-wheel drive mode during a predetermined period without shifting to said two-wheel drive mode; means for detecting turning of the motor vehicle; means, in response to said turning detecting means, for setting a time required for switching from said four-wheel drive mode to said two-wheel drive mode; and means, in response to said time setting means, for gradually reducing engaging force of said friction clutch when carrying out switching from said four-wheel drive mode to said two-wheel drive mode. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A system for controlling a four-wheel drive for a motor vehicle provided with main and secondary driving wheels, comprising:
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means for detecting a drive mode of the motor vehicle, the drive mode being selectable between a two-wheel drive mode and a four-wheel drive mode, the four-wheel drive mode being selectable between a direct-coupled four-wheel drive mode with distribution of traction between the main and secondary driving wheels being in a ratio of 1;
1, and an auto four-wheel drive mode where a state of the motor vehicle is automatically continuously changeable between the two-wheel drive mode and the direct-coupled four-wheel drive mode;means, in response to the drive mode detecting means, for controlling distribution of traction between the main and secondary driving wheels, the distribution controlling means comprising a changeover switch, which serves to select the drive mode, having a contact of the auto four-wheel drive mode that is positioned between contacts of the two-wheel drive mode and the direct-coupled four-wheel drive mode, requiring to pass the auto four-wheel drive mode when switching from the two-wheel drive mode to the direct-coupled four-wheel drive mode; and means, in response to the distribution controlling means, for distributing traction between the main and secondary driving wheels, the traction distributing means including a friction clutch and a solenoid, wherein the distribution controlling means comprises; means for determining a time elapsed during switching from the auto four-wheel drive mode to the two-wheel drive mode, means, in response to the time determining means, for continuing the auto four-wheel drive mode during a predetermined period without shifting to the two-wheel drive mode, means for detecting turning of the motor vehicle, means, in response to the turning detecting means, for setting a time required for switching from the four-wheel drive mode to the two-wheel drive mode, and means, in response to the time setting means, for gradually reducing engaging force of the friction clutch when carrying out switching from the four-wheel drive mode to the two-wheel drive mode.
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32. A motor vehicle comprising:
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main and secondary driving wheels; means for detecting a drive mode of the motor vehicle, the drive mode being selectable between a two-wheel drive mode and a four-wheel drive mode, the four-wheel drive mode being selectable between a direct-coupled four-wheel drive mode with distribution of traction between the main and secondary driving wheels being in a ratio of 1;
1, and an auto four-wheel drive mode where a state of the motor vehicle is automatically continuously changeable between the two-wheel drive mode and the direct-coupled four-wheel drive mode;means, in response to the drive mode detecting means, for controlling distribution of traction between the main and secondary driving wheels, the distribution controlling means comprising a changeover switch, which serves to select the drive mode, having a contact of the auto four-wheel drive mode that is positioned between contacts of the two-wheel drive mode and the direct-coupled four-wheel drive mode, requiring to pass the auto four-wheel drive mode when switching from the two-wheel drive mode to the direct-coupled four-wheel drive mode; and means, in response to the distribution controlling means, for distributing traction between the main and secondary driving wheels, the traction distributing means including a friction clutch and a solenoid, wherein the distribution controlling means comprises; means for determining a time elapsed during switching from the auto four-wheel drive mode to the two-wheel drive mode, means in response to the time determining means for continuing the auto four-wheel drive mode during a predetermined period without shifting to the two-wheel drive mode, means for detecting turning of the motor vehicle, means, in response to the turning detecting means, for setting a time required for switching from the four-wheel drive mode to the two-wheel drive mode, and means, in response to the time setting means, for gradually reducing engaging force of the friction clutch when carrying out switching from the four-wheel drive mode to the two-wheel drive mode.
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33. A system for controlling a four-wheel drive for a motor vehicle provided with main and secondary driving wheels, comprising:
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a drive mode switch arranged to detect a drive mode of the motor vehicle, the drive mode being selectable between a two-wheel drive mode and a four-wheel drive mode, the four-wheel drive mode being selectable between a direct-coupled four-wheel drive mode with distribution of traction between the main and secondary driving wheels being in a ratio of 1;
1, and an auto four-wheel drive mode where a state of the motor vehicle is automatically continuously changeable between the two-wheel drive mode and the direct-coupled four-wheel drive mode;a control device connected to the drive mode switch for controlling distribution of traction between the main and secondary driving wheels, the control device comprising a changeover switch, which serves to select the drive mode, having a contact of the auto four-wheel drive mode that is positioned between contacts of the two-wheel drive mode and the direct-coupled four-wheel drive mode so as to pass the auto four-wheel drive mode when switching from the two-wheel drive mode to the direct-coupled four-wheel drive mode; and a traction distributing device connected to the control device for distributing traction between the main and secondary driving wheels, the traction distributing device including a friction clutch and a solenoid, wherein the control device is arranged to; determine a time elapsed during switching from the auto four-wheel drive mode to the two-wheel drive mode; continue, in response to the time determined, the auto four-wheel drive mode during a predetermined period without shifting to the two-wheel drive mode; detect turning of the motor vehicle; set, in response to the turning detected, a time required for switching from the four-wheel drive mode to the two-wheel drive mode; and gradually reduce, in response to the time set, engaging force of the friction clutch when carrying out switching from the four-wheel drive mode to the two-wheel drive mode.
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34. A motor vehicle comprising:
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main and secondary driving wheels; a drive mode switch arranged to detect a drive mode of the motor vehicle, the drive mode being selectable between a two-wheel drive mode and a four-wheel drive mode, the four-wheel drive mode being selectable between a direct-coupled four-wheel drive mode with distribution of traction between the main and secondary driving wheels being in a ratio of 1;
1, and an auto four-wheel drive mode where a state of the motor vehicle is automatically continuously changeable between the two-wheel drive mode and the direct-coupled four-wheel drive mode;a control device connected to the drive mode switch for controlling distribution of traction between the main and secondary driving wheels, the control device comprising a changeover switch, which serves to select the drive mode, having a contact of the auto four-wheel drive mode that is positioned between contacts of the two-wheel drive mode and the direct-coupled four-wheel drive mode so as to pass the auto four-wheel drive mode when switching from the two-wheel drive mode to the direct-coupled four-wheel drive mode; and a traction distributing device connected to the control device for distributing traction between the main and secondary driving wheels, the traction distributing device including a friction clutch and a solenoid, wherein the control device is arranged to; determine a time elapsed during switching from the auto four-wheel drive mode to the two-wheel drive mode; continue, in response to the time determined, the auto four-wheel drive mode during a predetermined period without shifting to the two-wheel drive mode; detect turning of the motor vehicle; set, in response to the turning detected, a time required for switching from the four-wheel drive mode to the two-wheel drive mode; and gradually reduce, in response to the time set, engaging force of the friction clutch when carrying out switching from the four-wheel drive mode to the two-wheel drive mode.
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Specification