Vehicle brake system having two brake circuits
First Claim
1. A vehicle brake system (10) having two brake circuits (1, 2), which each comprise:
- at least one wheel brake (VL, HR;
VR, HL);
a fluid control module (38, 42, 44;
40, 46, 48;
24) for fluid pressure control at the at least one wheel brake (VL, HR;
VR, HL); and
at least one brake line (50, 52;
54, 56) for connecting the fluid control module (38, 42, 44;
40,46, 48;
24) to the at least one wheel brake (VL, HR;
HL, VR), such that only one brake line (50;
52;
54;
56) is connected to each wheel brake (VL;
HR;
HL;
VR), characterized in thata sensor arrangement (58) for determining failure of a brake circuit (1;
2) is provided, and the fluid control modules (38, 42, 44;
40, 46, 48;
24) in the event of failure of a brake circuit (1;
2) are capable of controlling the fluid pressure at the at least one wheel brake (VR, HL;
VL, HR) of the intact brake circuit (2;
1) in such a way that the gradient of a developing yawing moment (G) of a vehicle provided with the vehicle brake system (10) does not exceed a predetermined maximum value.
1 Assignment
0 Petitions
Accused Products
Abstract
Two brake circuits (1, 2) each comprise at least one wheel brake (VL, VR, HL, HR), a fluid control module (38, 42, 44; 40, 46, 48; 24) for fluid pressure control at the at least one wheel brake, and at least one brake line (50, 52; 54, 56) for connecting the fluid control module to the at least one wheel brake, such that only one brake line is connected to each wheel brake. In order to increase the safety of the vehicle brake system during braking with only one intact brake circuit, according to the invention in the vehicle brake system a sensor arrangement (58) for determining failure of a brake circuit is provided, and the fluid control modules in the event of failure of a brake circuit are capable of controlling the fluid pressure at the at least one wheel brake of the intact brake circuit in such a way that the gradient of a developing yawing moment (G) of a vehicle provided with the vehicle brake system does not exceed a predetermined maximum value.
25 Citations
21 Claims
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1. A vehicle brake system (10) having two brake circuits (1, 2), which each comprise:
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at least one wheel brake (VL, HR;
VR, HL);
a fluid control module (38, 42, 44;
40, 46, 48;
24) for fluid pressure control at the at least one wheel brake (VL, HR;
VR, HL); and
at least one brake line (50, 52;
54, 56) for connecting the fluid control module (38, 42, 44;
40,46, 48;
24) to the at least one wheel brake (VL, HR;
HL, VR), such that only one brake line (50;
52;
54;
56) is connected to each wheel brake (VL;
HR;
HL;
VR),characterized in that a sensor arrangement (58) for determining failure of a brake circuit (1;
2) is provided, andthe fluid control modules (38, 42, 44;
40, 46, 48;
24) in the event of failure of a brake circuit (1;
2) are capable of controlling the fluid pressure at the at least one wheel brake (VR, HL;
VL, HR) of the intact brake circuit (2;
1) in such a way that the gradient of a developing yawing moment (G) of a vehicle provided with the vehicle brake system (10) does not exceed a predetermined maximum value.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling a vehicle brake system (10) having the step:
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providing a vehicle brake system (10) having two brake circuits (1;
2), which each comprise at least one wheel brake (VL, HR;
VR, HL), a fluid control module (38, 42, 44;
40, 46, 48;
24) for fluid pressure control at the at least one wheel brake (VL, HR;
VR, HL), and at least one brake line (50, 52;
54, 56) for connecting the fluid control module (38, 42, 44;
40, 46, 48;
24) to the at least one wheel brake (VL, HR;
HL, VR), such that only one brake line (50;
52;
54;
56) is connected to each wheel brake (VL;
HR;
HL;
VR),characterized by the steps;
providing a sensor arrangement (58) for determining failure of a brake circuit (1;
2),determining failure of a brake circuit (1;
2), andcontrolling the fluid pressure at the at least one wheel brake (VR, HL;
VL, HR) of the intact brake circuit (2;
1) so that the gradient of a developing yawing moment (G) of a vehicle provided with the vehicle brake system (10) does not exceed a predetermined maximum value.- View Dependent Claims (10)
providing a rotational speed sensor (58) at each wheel brake (VL, VR, HL, HR), determining the slip values of the rotational speed sensors (58), comparing the slip values of wheels (14) with at least one of one another and with stored slip values of a conventional ABS braking operation, and determining the variation of the slip values.
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11. A vehicle brake system comprising:
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two brake circuits, each brake circuit including;
a wheel brake, a respective brake line connected to the wheel brake, and a fluid control module connected by the brake line to the wheel brake for controlling fluid pressure at the wheel brake, the fluid control module for each of the two brake circuits being capable, in the event of failure of the other of the two brake circuits, of controlling the fluid pressure at the wheel brake of the associated non-failed brake circuit in such a way that the gradient of a developing yawing moment of a vehicle provided with the vehicle brake system does not exceed a predetermined maximum value; and
a sensor arrangement for determining failure of a brake circuit. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method of controlling a vehicle brake system having two brake circuits, each brake circuit having at least one wheel brake, a fluid control module for fluid pressure control at the at least one wheel brake, and at least one brake line for connecting the fluid control module to the at least one wheel brake, such that only one brake line is connected to each wheel brake, the vehicle brake system further having a sensor arrangement for determining failure of a brake circuit, the method including the steps of:
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determining that one of the brake circuits has failed; and
controlling the fluid pressure at the at least one wheel brake of the other of the brake circuits so that the gradient of a developing yawing moment of a vehicle provided with the vehicle brake system does not exceed a predetermined maximum value. - View Dependent Claims (20)
determining slip values associated with each wheel from the rotational speed sensors;
comparing the slip values of wheels with at least one of one another and with stored slip values of a conventional ABS braking operation; and
determining the variation of the slip values.
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21. A vehicle brake system comprising:
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a first brake circuit;
a second brake circuit; and
a sensor arrangement for determining failure of a brake circuit, each of the brake circuits including;
at least one wheel brake, a fluid control module associated with the at least one wheel brake of the same brake circuit, the fluid control module being capable of controlling fluid pressure at the associated at least one wheel brake, in event that failure of the other brake circuit is sensed by the sensor arrangement, in such a way that the gradient of a developing yawing moment of a vehicle on which the brake system is installed does not exceed a predetermined maximum value; and
at least one brake line for connecting the fluid control module to the associated at least one wheel brake, such that only one brake line is connected to each wheel brake.
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Specification