Vehicle brake system having two brake circuits

A method of controlling a vehicle brake system (10) having the step:

• 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), and
• controlling 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.

A vehicle brake system comprising:

• 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.

A vehicle brake system comprising:

• 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.