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Method and recording medium for determining a malfunction of an actuator of a hydraulic system

A technology of actuators and hydraulic systems, applied in the field of hydraulic systems, can solve problems such as difficulties

Active Publication Date: 2022-02-22
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, due to the presence of air, it is very difficult to accurately monitor the injection volume of the urea aqueous solution injection device by the magnitude of the pressure change in the hydraulic circuit caused by the injection device and to determine whether it is operating normally.

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  • Method and recording medium for determining a malfunction of an actuator of a hydraulic system
  • Method and recording medium for determining a malfunction of an actuator of a hydraulic system
  • Method and recording medium for determining a malfunction of an actuator of a hydraulic system

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Embodiment Construction

[0017] The preferred embodiments of the present invention will be described in detail below with reference to examples. It should be understood by those skilled in the art that these embodiments are illustrative and not meant to limit the present invention.

[0018] figure 2 The hydraulic system of the on-board exhaust treatment system is shown in a simplified schematic. Such as figure 2 As shown, the hydraulic system 1 of the onboard exhaust gas treatment system generally includes a pump 5 for pumping urea aqueous solution from a urea aqueous solution container (not shown) to the high-pressure zone 3 of the hydraulic circuit, and a pump 5 for pumping urea aqueous solution from the hydraulic circuit Injection means 7 from the high pressure zone 3 onto a mixer (not shown), and a pressure sensor 9 for sensing the pressure of the liquid in the high pressure zone 3 of the hydraulic circuit. More or less air 11 is entrained in the high pressure area 3 of the hydraulic circuit....

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Abstract

The invention provides a method and a storage medium for determining a malfunction of an actuator of a hydraulic system comprising a hydraulic circuit with a high-pressure zone and at least two actuators, the operation of the actuators causing a pressure in the high-pressure zone of the hydraulic circuit fluctuation. The method includes: (a) through experiments, predetermining a reference ratio of the amplitudes of the pressure fluctuation components generated by two of the at least two actuators respectively in the high-pressure area of ​​the hydraulic circuit, the reference ratio is generally a constant value (b) determining the actual ratio of the amplitudes of the pressure fluctuation components generated by two of the at least two actuators respectively in the high-pressure area of ​​the hydraulic circuit; (c) comparing the actual ratio with the reference ratio; (d) If the actual ratio deviates from the reference ratio, it is determined that at least one of the corresponding pair of actuators is faulty. According to the present invention, it is possible to quickly and accurately determine whether an actuator of the hydraulic system is faulty.

Description

technical field [0001] The invention relates to a hydraulic system, in particular to a method for detecting a fault of an actuator of a hydraulic system. The invention also relates to a recording medium. Background technique [0002] In a hydraulic system, actuators such as pumps, valves, injection devices, etc. are usually installed on the hydraulic circuit. These actuators, which operate at a specific frequency, usually have an influence on the pressure in the hydraulic circuit during operation, for example causing pressure fluctuations. Theoretically, the pressure fluctuation component generated by a single actuator in the hydraulic circuit can be obtained by the Fourier transform principle, and by monitoring the change of the pressure fluctuation component, it can be determined whether the single actuator operates normally or fails. [0003] For example, in an on-board exhaust gas treatment system using the Selective Catalytic Reduction (SCR) method, the pump pumps the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B19/00F15B21/02
CPCF15B19/005F15B21/02
Inventor 周洪龙董驷维马占胜许玉江江以涛金未平
Owner ROBERT BOSCH GMBH