Braking torque control system and method for wheeled vehicle having regenerative braking torque generator and frictional braking torque generator
First Claim
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1. A braking torque control system for a wheeled vehicle, comprising:
- a regenerative braking torque generator that provides regenerative braking torque to the wheels by a regenerative brake action of an electric motor connected to the wheels;
a frictional braking torque generator that provides frictional braking torque to the wheels by pressing friction devices against brake elements that rotate with the wheels; and
a controller that controls the regenerative braking torque generator and the frictional braking torque generator to provide a total braking torque, which is a combination of the regenerative braking torque and the frictional braking torque, on the basis of data exchanging between the regenerative braking torque generator and the frictional braking torque generator, the controller reducing the regenerative braking torque generated by the regenerative braking torque generator when there is a failure in the data exchanging.
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Abstract
A braking torque control system has a regenerative braking torque generator and a frictional braking torque generator and can control a total braking torque when there is failure in exchanging data between the regenerative braking torque generator and the hydraulic braking torque generator. In particular, when there is an abnormality in the exchanging of data, the target regenerative braking torque is reduced.
79 Citations
22 Claims
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1. A braking torque control system for a wheeled vehicle, comprising:
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a regenerative braking torque generator that provides regenerative braking torque to the wheels by a regenerative brake action of an electric motor connected to the wheels; a frictional braking torque generator that provides frictional braking torque to the wheels by pressing friction devices against brake elements that rotate with the wheels; and a controller that controls the regenerative braking torque generator and the frictional braking torque generator to provide a total braking torque, which is a combination of the regenerative braking torque and the frictional braking torque, on the basis of data exchanging between the regenerative braking torque generator and the frictional braking torque generator, the controller reducing the regenerative braking torque generated by the regenerative braking torque generator when there is a failure in the data exchanging. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A braking torque control system for a wheeled vehicle, comprising:
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a regenerative braking torque generator that provides regenerative braking torque to the wheels by a regenerative brake action of an electric motor connected to the wheels; a frictional braking torque generator that provides frictional braking torque to the wheels by pressing friction devices against brake elements that rotate with the wheels; and a controller that controls the regenerative braking torque generator and the frictional braking torque generator to provide a total braking torque, which is a combination of the regenerative braking torque and the frictional braking torque, on the basis of data exchanging between the regenerative braking torque generator and the frictional braking torque generator, the controller increasing the frictional braking torque generated by the frictional braking torque generator when there is a failure in the data exchanging.
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12. A braking torque control system for a wheeled vehicle, comprising:
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a regenerative braking torque generator that provides regenerative braking torque to the wheels by a regenerative brake action of an electric motor connected to the wheels; a frictional braking torque generator that provides frictional braking torque to the wheels by pressing friction devices against brake elements that rotate with the wheels; and a controller that controls the regenerative braking torque generator and the frictional braking torque generator to provide a total braking torque, which is a combination of the regenerative braking torque and the frictional braking torque, on the basis of data exchanging between the regenerative braking torque generator and the frictional braking torque generator, the controller being selectively operative in (a) a priority-regenerative braking torque controlling mode in which the frictional braking torque is controlled based on the regenerative braking torque and (b) a priority-frictional-braking torque controlling mode in which the regenerative braking torque is controlled based on increasing the frictional braking torque;
the controller switching from the priority-regenerating braking torque controlling mode to the priority-frictional braking torque controlling mode when there is a failure of the data exchanging. - View Dependent Claims (13)
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14. A braking torque control system for a wheeled vehicle, comprising:
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a regenerative braking torque generator that provides regenerative braking torque to the wheels by a regenerative brake action of an electric motor connected to the wheels; a frictional braking torque generator that provides frictional braking torque to the wheels by pressing friction devices against brake elements that rotate with the wheels; and a controller that controls the regenerative braking torque generator and the frictional braking torque generator to provide a total braking torque, which is a combination of the regenerative braking torque and the frictional braking torque, the controller prohibiting the regenerative braking torque generated by the regenerative braking torque generator from being reduced at a changing rate that is greater than a maximum possible changing rate of the frictional braking torque, said maximum possible changing rate of the frictional braking torque being smaller than a maximum possible changing rate of the regenerative braking torque.
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15. A method of controlling braking torque for a wheeled vehicle, comprising the steps of:
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providing regenerative braking torque to the wheels by a regenerative brake action of an electric motor connected to the wheels; providing frictional braking torque to the wheels by pressing friction devices against brake elements that rotate with the wheels; and controlling a total braking torque, which is a combination of the regenerative braking torque and the frictional braking torque, on the basis of data exchanging between a regenerative braking torque generator and a frictional braking torque generator, wherein the regenerative braking torque is reduced when there is a failure in the data exchanging. - View Dependent Claims (16, 17, 18)
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19. A method of controlling braking torque for a wheeled vehicle, comprising the steps of:
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providing regenerative braking torque to the wheels by a regenerative brake action of an electric motor connected to the wheels; providing frictional braking torque to the wheels by pressing friction devices on brake elements that rotate with the wheels; and controlling a total braking torque, which is a combination of the regenerative braking torque and the frictional braking torque, on the basis of data exchanging between a regenerative braking torque generator and a frictional braking torque generator, wherein the frictional braking torque is increased when there is a failure in the data exchanging.
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20. A method of controlling braking torque for a wheeled vehicle, comprising the steps of:
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providing regenerative braking torque to the wheels by a regenerative brake action of an electric motor connected to the wheels; providing frictional braking torque to the wheels by pressing friction devices on brake elements that rotate with the wheels; and controlling a total braking torque, which is a combination of the regenerative braking torque and the frictional braking torque, on the basis of data exchanging between a regenerative braking torque generator and a frictional braking torque generator, by selectively operating in (a) a priority-regenerative braking torque controlling mode in which the frictional braking torque is controlled based on the regenerative braking torque and (b) a priority-frictional-braking braking torque controlling mode in which the regenerative braking torque is controlled based on increasing the frictional braking torque; and switching from the priority-regenerating braking torque controlling mode to the priority-frictional braking torque controlling mode when there is a failure of the data exchanging. - View Dependent Claims (21)
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22. A method of controlling braking torque for a wheeled vehicle, comprising the steps of:
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providing regenerative braking torque to the wheels by a regenerative brake action of an electric motor connected to the wheels; providing frictional braking torque to the wheels by pressing friction devices against brake elements that rotate with the wheels; and controlling a total braking torque, which is a combination of the regenerative braking torque and the frictional braking torque, wherein the regenerative braking torque generated by the regenerative braking torque generator is prohibited from being reduced at a changing rate that is greater than a maximum possible changing rate of the frictional braking torque, said maximum possible changing rate of the frictional braking torque being smaller than a maximum possible changing rate of the regenerative braking torque.
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Specification