Compressed air brake system for a vehicle and a method for controlling a compressed air brake system of this type

Abstract

The invention relates to a method for controlling a compressed air brake system (1) of a vehicle, comprising the following steps: in the case of driver braking (FB) by actuating a brake pedal, outputting a similar driver brake pressure via a brake pressure control line, an activation device to a brake circuit, set in a driver brake position (S4 = 0), comprising at least one ABS shut-off valve device, a brake line and a wheel brake (St4); in the case of there being an external brake request signal of a driver assistance system without simultaneous driver braking, switching the activation deviceinto a functional position; conveying a system pressure to the ABS shut-off valve device; and modulating a similar brake pressure on the at least one brake line of the brake circuit with the at leastone wheel brake by controlling the ABS shut-off valve device (St5), characterised in that when there is driver braking as well as an external brake request signal, the driver brake pressure is measured and a driver brake pressure value is determined, the driver brake pressure value and an external brake pressure value contained in the external brake request signal are added or superimposed to form a combined brake pressure value, and the activation device is switched into the functional position and the combined brake pressure value is modulated from the system pressure by controlling the ABSshut-off valve device (St6).

Description

technical field [0001] The invention relates to a compressed air braking system for a vehicle and a method for controlling such a compressed air braking system. Background technique [0002] Depending on the regulation of the brake pressure achieved by the driver when the brake pedal is actuated during the driver's braking operation, compressed air brake systems for vehicles can be divided into those with analogue functions, also known as ABS systems. Compressed air brake systems for brake pressure lines and electronic brake systems also known as EBS systems. [0003] In a simulated braking system or ABS braking system, when the brake pedal is actuated, a simulated compressed air value is provided by the coupled brake valve to the brake pressure control circuit, which is then (Possibly via further valve devices, such as axle load distributors and valve devices for switching on further functions) to one or more brake circuits. In addition, an ABS control device for regulati...

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Problems solved by technology

[0011] However, it can be pointed out that this method may lead to unfavorable switching back and forth of the switching device, wherein during this switching process, there will be sudden changes in the braking performance, because, for example, in the driver simulated from it When the brake pressure is applied to the activation device, when the driver's braking operation is switched to the driver's auxiliary braking operation, first of all the high system pressure is applied to the activation device very suddenly and only then is activated by the ABS. The shut-off valve decreases in a clocked manner

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