Vehicle bench test fan abnormity monitoring system

Abstract

The invention relates to a fan abnormity monitoring system for a vehicle bench test. The fan abnormity monitoring system comprises a pressure difference sensor, a monitoring device and a fan controller. The differential pressure sensor is in signal connection with the monitoring device, and the monitoring device is in signal connection with the fan controller. The pressure difference sensor connecting gas circuit is divided into a high-pressure end and a low-pressure end, the high-pressure end of the pressure difference sensor is connected to the air opening of the fan, and the low-pressure end of the pressure difference sensor is connected to the atmosphere. The differential pressure sensor converts the differential pressure generated at the two ends into an electric signal, and the differential pressure signal is transmitted to a monitoring device in real time through a communication line based on the CAN bus technology. And the monitoring device stores the pressure difference data and continuously performs outlier data verification so as to judge whether the state of the fan is abnormal or not, when the state of the fan is judged to be abnormal, the monitoring device sends a shutdown signal to the fan controller, and the fan controller controls the fan to stop. The monitoring system can realize automatic judgment of fan abnormity and identify potential abnormal conditions of the fan at the first time.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle bench tests, and in particular to a vehicle bench test fan abnormality monitoring system. Background Art

[0002] During vehicle bench tests, fans are often required to blow air on test parts (for example, fans are required to blow air on the engine oil pan during engine performance bench tests). During the test, if the fan is damaged (such as fan burning and locking), the test parts will be damaged. Therefore, a monitoring system is needed to achieve effective monitoring of the bench test fan. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a vehicle bench test fan abnormality monitoring system, which can realize automatic determination of fan abnormalities and identify potential abnormal conditions of the fan in the first place.

[0004] The technical solution adopted by the present invention is:

[0005] Provided is a vehicle bench test fan abnormality monitoring system, comprising: a pressure difference sensor, a monitoring device and a fan controller; the pressure difference sensor is connected to the monitoring device by signal, and the monitoring device is connected to the fan controller by signal; the high-pressure end of the pressure difference sensor is connected to the fan outlet, and the low-pressure end of the pressure difference sensor is connected to the atmosphere;

[0006] The pressure difference sensor sends the detected real-time pressure difference data to the monitoring device, and the monitoring device stores the pressure difference data and continuously performs outlier data verification to determine whether the fan is in an abnormal state; when the fan state is determined to be abnormal, the monitoring device sends a shutdown signal to the fan controller, and the fan controller controls the fan to shut down.

[0007] Furthermore, the method for checking the outlier data is specifically as follows:

[0008] a. Establishment of preliminary verification standards: Under the condition of normal operation of the fan, in at least one complete vehicle bench test, the pressure difference sensor collects the pressure difference data of the whole process of the fan operation and sends it to the monitoring device, and the monitoring device calculates the mean value of the pressure difference data. and standard deviation , and based on the mean and standard deviation Automatically set threshold range;

[0009] b. Real-time verification: After the verification standard is established, in the subsequent vehicle bench test, when the real-time pressure difference data from the pressure difference sensor exceeds the threshold range, the monitoring device sends a shutdown signal to the fan controller.

[0010] Furthermore, the mean The calculation formula is: ; The standard deviation The calculation formula is: ;in, represents the ith pressure difference value, and n represents the number of pressure difference data collected in the previous period.

[0011] Furthermore, the threshold range is: .

[0012] Furthermore, the differential pressure sensor and the monitoring device are connected via a communication line based on CAN bus technology.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The monitoring system of the present invention has a simple structure and only requires a pressure difference sensor and utilizes the existing monitoring and control device on the test bench to achieve real-time monitoring of the fan system;

[0015] 2. The control method of the monitoring system of the present invention is simple and reliable, and the limit value can be set by the data in the early stage, without manually setting the relevant alarm limit value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A topology diagram of a vehicle bench test fan abnormality monitoring system according to an embodiment of the present invention is shown;

[0018] Figure 2 A monitoring flow chart of a vehicle bench test fan abnormality monitoring system according to an embodiment of the present invention is shown;

[0019] Figure 3 A distribution curve diagram of differential pressure data collected during the early verification standard formulation phase in an example of the present invention is shown. DETAILED DESCRIPTION

[0020] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0021] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". Other explicit and implicit definitions may also be included below.

[0022] like Figure 1 As shown, a vehicle bench test fan abnormality monitoring system is provided, including a pressure difference sensor 2, a monitoring device 3 and a fan controller 4. The pressure difference sensor 2 is signal-connected to the monitoring device 3, and the monitoring device 3 is signal-connected to the fan controller 4. The air path connecting the pressure difference sensor 2 is divided into two paths, a high-pressure end and a low-pressure end, wherein the high-pressure end of the pressure difference sensor 2 is connected to the air outlet of the fan 1, and the low-pressure end of the pressure difference sensor 2 is connected to the atmosphere. The pressure difference sensor 2 converts the pressure difference generated at both ends into an electrical signal, and transmits the pressure difference signal to the monitoring device 3 in real time through a communication line based on CAN bus technology. The monitoring device 3 stores the pressure difference data and continuously performs outlier data verification to determine whether the fan is in an abnormal state. When it is determined that the fan is in an abnormal state, the monitoring device 3 sends a shutdown signal to the fan controller 4, and the fan controller controls the fan 1 to shut down.

[0023] like Figure 2 As shown, in addition to storing the real-time transmitted signal, the monitoring device 3 also verifies the outlier data of the real-time transmitted signal to find abnormal values. First, the method of outlier data verification is divided into two stages: the initial verification standard automatic formulation stage and the real-time verification monitoring stage.

[0024] In the early stage of automatic calibration standard formulation, when the fan is operating normally, in at least one complete vehicle bench test, the pressure difference sensor 2 collects the pressure difference data of the whole operation process of the fan 1 and sends it to the monitoring device 3, and the monitoring device 3 calculates the mean value of the above pressure difference data. and standard deviation , and based on the mean and standard deviation Automatically set the threshold range. Preferably, , In the formula, represents the pressure difference value of the i-th point, and n represents the number of collected data. Then according to the ‌3σ principle, the threshold range is See also Figure 3 , Figure 3 In an example, in the early stage of automatic calibration standard formulation, the pressure difference data of the whole process of fan operation collected by the pressure difference sensor is distributed in a curve chart, where the horizontal axis represents the pressure difference (pa) and the vertical axis represents the probability density. Figure 3 It can be seen that the pressure difference data conforms to the normal distribution, so the outlier data can be verified by the outlier test method based on statistics.

[0025] In the real-time verification monitoring stage, the verification standards have been formulated in the early stage. In the subsequent vehicle bench test, when the real-time pressure difference data from the pressure difference sensor 2 exceeds the upper limit or below the lower limit When the monitoring device 3 determines that the data at this time is an abnormal value (outlier), the shutdown mechanism is triggered. This monitoring system can automatically determine the abnormality of the fan without manually setting the relevant threshold. Through real-time data, the potential abnormality of the fan can be identified in the first time.

[0026] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. The structures and connection modes of the components in the present invention can be changed, and any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A vehicle bench test fan abnormality monitoring system, characterized in that: include: A pressure difference sensor, a monitoring device and a fan controller; the pressure difference sensor is connected to the monitoring device by signal, and the monitoring device is connected to the fan controller by signal; The high-pressure end of the differential pressure sensor is connected to the air outlet of the fan, and the low-pressure end of the differential pressure sensor is connected to the atmosphere; The pressure difference sensor sends the detected real-time pressure difference data to the monitoring device, and the monitoring device stores the pressure difference data and continuously performs outlier data verification to determine whether the fan is in an abnormal state; When it is determined that the fan state is abnormal, the monitoring device sends a shutdown signal to the fan controller, and the fan controller controls the fan to shut down.

2. A vehicle bench test fan abnormality monitoring system as claimed in claim 1, characterized in that: The method for checking the outlier data is specifically as follows: a. Establishment of preliminary verification standards: Under the condition of normal operation of the fan, in at least one complete vehicle bench test, the pressure difference sensor collects the pressure difference data of the whole process of the fan operation and sends it to the monitoring device, and the monitoring device calculates the mean value of the pressure difference data. and standard deviation , and based on the mean and standard deviation Automatically set threshold range; b. Real-time verification: After the verification standard is established, in the subsequent vehicle bench test, when the real-time pressure difference data from the pressure difference sensor exceeds the threshold range, the monitoring device sends a shutdown signal to the fan controller.

3. A vehicle bench test fan abnormality monitoring system as claimed in claim 2, characterized in that: The mean The calculation formula is: ; The standard deviation The calculation formula is: ;in, represents the ith pressure difference value, and n represents the number of pressure difference data collected in the previous period.

4. A vehicle bench test fan abnormality monitoring system as claimed in claim 2 or 3, characterized in that: The threshold range is: .

5. The vehicle bench test fan abnormality monitoring system according to claim 1, characterized in that: The differential pressure sensor is connected to the monitoring device via a communication line based on CAN bus technology.

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