Method and apparatus for controlling the brake system of a vehicle
First Claim
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1. Method for controlling a vehicle brake system having front and rear wheel brakes actuated by a driver, and valves for increasing and decreasing a brake pressure at that rear wheel brake, said method comprising:
- determining whether a braking process has been initiated by the driver;
determining pulses with predetermined pressure build up times and pressure release times, when a braking process has been initiated by the driver; and
outputting said pulses to the valves for increasing and decreasing brake pressure at said rear wheels in an alternating manner, whereby the pressure in said rear wheel brakes is alternately built up and released causing the brake pressure in the rear wheel actually reached to be, on average, below the primary pressure specified by the driver.
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Abstract
A method for distributing the braking force between the front and rear axles, pressure is built up and released alternately at the rear axle brakes, so that, on average, a saturation pressure is reached which is below the primary pressure specified by the driver. This method is suitable especially for brake systems without pressure reducers for the rear wheel brakes, when, in the absence of input information, the electronic distribution of the braking force is no longer possible.
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Citations
13 Claims
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1. Method for controlling a vehicle brake system having front and rear wheel brakes actuated by a driver, and valves for increasing and decreasing a brake pressure at that rear wheel brake, said method comprising:
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determining whether a braking process has been initiated by the driver;
determining pulses with predetermined pressure build up times and pressure release times, when a braking process has been initiated by the driver; and
outputting said pulses to the valves for increasing and decreasing brake pressure at said rear wheels in an alternating manner, whereby the pressure in said rear wheel brakes is alternately built up and released causing the brake pressure in the rear wheel actually reached to be, on average, below the primary pressure specified by the driver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Apparatus for controlling a brake system having front and rear wheel brakes actuated by a drive, and valves for increasing and decreasing a brake pressure at that rear wheel brake, said apparatus comprising:
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means for determining whether a braking process has been initiated by the driver;
means for determining pulses with predetermined pressure build up times and pressure release times, when a braking process has been initiated by the driver; and
means for outputting said pulses to the valves for increasing and decreasing brake pressure at said rear wheels in an alternating manner, whereby the pressure in said rear wheel brakes is alternately built up and released causing the brake pressure in the rear wheel actually reached to be, on average, below the primary pressure specified by the driver. - View Dependent Claims (12)
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13. Method for controlling a vehicle brake system having front and rear wheel brakes actuated by a driver, and valves for increasing and decreasing a brake pressure at that rear wheel brake, said method comprising:
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determining whether a braking process has been initiated by the driver;
determining pulses to buildup and to release pressure in the rear wheel brake; and
outputting said pulses in an alternating manner so that pressure in said rear wheel brake is alternately built up and released, whereby the pressure in said rear wheel brake remains below the pressure specified by the driver, wherein the alternating buildup and release of pressure at the rear wheel brakes is implemented after the failure of an electronic branding force distribution controller.
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Specification