Method for operating a hydraulic or pneumatic system

Abstract

The invention relates to a method for operating a hydraulic or pneumatic system. The system comprises at least one pressure accumulator. The system is provided with at least one valve unit and a sensor for the at least indirect detection of the position of the valve unit and / or at least one sensor for the detection of a value that is at least indirectly related to the pressure on the side of the valve unit facing away from the pressure accumulator. At least one value is detected with one of the sensors when using the method. According to the invention, the detected value or values is or are compared to reference values. On the basis of an agreement or a difference between the value(s) and the reference values, an error function of the system and / or the pressure in the region of the system present on the side facing away from the sensor for detecting a value which relates at least indirectly to the pressure on the side of the valve unit facing away from the pressure accumulator, are determined.

Description

technical field [0001] The invention relates to a method for operating a hydraulic or pneumatic system having the features defined in claims 1 and 8 in the preamble. Background technique [0002] Pneumatic and / or hydraulic systems with storage devices and corresponding valves are known from the general prior art. In addition, systems of this type often have sensors and / or devices which make it possible to detect the pressure in the system and / or the position of the state of the valve device. An example of such a system here is a compressed air system or a compressed air supply system of a motor vehicle. Such a system is known, for example, from DE 10 2004 059 835 A1. [0003] In this case, it is typical for such compressed air systems that they have a pressure accumulator which, depending on the driving state, is supplied with an inlet pressure by the compressor accordingly. In this case, the pressure sensor is often arranged on the side of the valve arrangement relevant ...

AI Technical Summary

Problems solved by technology

If this is the case, the increased pressure of the valve device as regulating valve cannot be detected by the subsequent pressure regulating object

Then the difficulty of adjustment is increased accordingly, because the inlet pressure of the system is not known

Furthermore, without such a pressure sensor in the area of ​​the pressure accumulator, it is not possible to determine whether the insufficient pressure in the area behind the valve arrangement is due to a malfunction in the system or simply because the pressure in the pressure accumulator is too low

[0004] Furthermore, coupled with the fact that the value detected by the pressure sensor and / or the state of the valve device is typically known only at the instant of each detection, these reasons together make it impossible to detect faults in such systems, or only by means of Additional diagnostic sensing mechanisms are required to know

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