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A sensor fault diagnosis method

A sensor failure and sensor technology, applied in instruments and other directions, can solve problems such as hidden dangers of operator and equipment safety, sensor detection device diagnosis, etc., and achieve the effects of stable and reliable safe operation, improved coverage, and improved scope.

Active Publication Date: 2021-01-12
HUNAN SINOBOOM HEAVY IND
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  • Claims
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Problems solved by technology

[0004] However, these judgment schemes do not diagnose the detection device of the sensor itself. When the detection device of the sensor itself fails (such as the drawstring mechanism of the length sensor is stuck, the sensor signal detection and processing module is faulty), the AD value is in progress. If the action remains unchanged, or the action exceeds the value in the original normal state, but is within the set limit value range, the controller will consider the sensor to be in a normal state at this time, and will not limit the action under sensor failure , which will bring great potential safety hazards to operators and equipment

Method used

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Embodiment 3

[0054] Embodiment 3 of the present invention is: a sensor fault judgment method, which is different from Embodiment 1 in that: the sensor uses CAN communication to transmit data, therefore, the following method can also be used in the process of fault judgment of this type of sensor Diagnosis: On the basis of monitoring the heartbeat of CAN communication, use the communication function of the controller to perform real-time data diagnosis to expand the scope of diagnosis. If the return value of the communication function is not the normal value specified by the function (usually, the function return value 0 or 1 is the normal state, and the normal value can be specified differently according to different controllers), the communication or value of the sensor is also considered If there is an abnormality, make a sensor failure judgment.

[0055] The minimum current referred to in the present invention is the lowest current value required by the mechanism to complete the corresp...

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Abstract

The invention discloses a fault judgment method for a sensor. The sensor is used for a device provided with a telescoping and / or rotating mechanism. The method comprises the following steps: transmitting an action output signal capable of causing sensor signal change to the telescoping and / or rotating mechanism by the device, starting a delay relay, and mechanism action time recorded by the delayrelay exceeds the delay relay and the value of the sensor signal change is smaller than a first set value, judging that the sensor breaks down. According to the method, stay cord clamping stagnation,signal detection module fault or other conditions causing that the output value of the sensor remains stationary which cannot be recognized by a conventional fault judgment method can be recognized, and the safety of an aerial work platform by using the scheme is higher.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a sensor fault judgment method. Background technique [0002] During the working process of the aerial work platform, it is usually necessary to use a single (dual) channel sensor to detect the position of the structural parts, which is processed by the controller to ensure that the work platform is always in a safe state. In order to meet this requirement, in addition to real-time monitoring and processing of the collected values ​​of the sensor, it is also necessary to monitor whether the sensor itself is faulty in real time. When a fault is detected in the sensor itself, the controller will limit the movement of the platform, and only allow the platform to move in a safe direction, such as boom retraction, amplitude drop, slow rotation, etc., so as to make the platform out of the unsafe state and ensure safe operation . Therefore, the sensor failure signal is close...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D18/00
CPCG01D18/00
Inventor 刘国良邹俊辉
Owner HUNAN SINOBOOM HEAVY IND
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