A fault diagnosis device for sliding vane air compressor

Abstract

The present invention provides a vane air compressor fault diagnosis device, which relates to the field of new energy vehicle control technology, including a lubrication system detection module, wherein the lubrication system detection module is used to detect the operating time of the air compressor and the replacement time of the oil temperature; a temperature and humidity detection module, wherein the temperature and humidity detection module is used to detect the operating temperature of the air compressor and the air storage cylinder; and a pressure system detection module, wherein the pressure system detection module is used to detect the pressure parameters of the air compressor. The present application overcomes the shortcomings of the existing technology and proposes a fault diagnosis method for an electric air compressor, which effectively avoids the frequent start and stop of the air compressor when the input signal is normal, prolongs the service life of the air compressor, ensures that the water in the air storage cylinder is discharged in time, and solves the problem that the existing control methods can achieve the purpose of automatic start and stop of the electric air compressor, but do not involve diagnosis and treatment measures in the event of a control signal failure, and have the problems of low reliability and poor adaptability.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicle control, and more specifically, relates to a fault diagnosis device for a vane air compressor. Background Art

[0002] At present, domestic new energy vehicle companies generally use compressed air to control the vehicle's braking system, air suspension system, etc. The current starting strategies of electric air compressors are generally consistent, and the shutdown strategies generally adopt two methods: (1) Pure electric vehicle air pump control method, VCU starts the air pump according to the brake air pressure, and stops the air pump after receiving the unloading signal of the dryer; (2) Electric air compressor adaptive shutdown control method and device, VCU uses the working current of the electric air compressor to judge whether the dryer is unloaded, thereby controlling the air pump to stop; Electric air compressors are used to provide compressed air for the braking system, which has a great impact on the safe driving of the car and the life of the braking system. Ordinary piston, vortex and other air compressors cannot meet the various needs of the entire vehicle, especially when the air compressor is installed on the chassis of the entire vehicle. The driver cannot observe and discover the operating failure of the air compressor in time, and often repairs and maintenance are carried out only after the failure occurs, and maintenance and detection are difficult, affecting driving safety.

[0003] Based on the above, existing control methods can achieve the purpose of automatic start and stop of electric air compressors, but do not involve diagnosis and treatment measures in the event of control signal failure, and are not reliable and have poor adaptability.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a sliding vane air compressor fault diagnosis device is provided to achieve a more practical purpose. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a vane air compressor fault diagnosis device to solve the problem that the existing control methods proposed in the above background technology can achieve the purpose of automatic start and stop of the electric air compressor, but do not involve diagnosis and treatment measures in the event of control signal failure, and have the problems of low reliability and poor adaptability.

[0006] The purpose and efficacy of the vane air compressor fault diagnosis device of the present invention are achieved by the following specific technical means:

[0007] A vane air compressor fault diagnosis device, comprising:

[0008] A lubrication system detection module, which is used to detect the operating time of the air compressor and the replacement time of the oil temperature;

[0009] A temperature and humidity detection module, which is used to detect the operating temperature of the air compressor and the air storage cylinder;

[0010] A pressure system detection module, which is used to detect the pressure parameters of the air compressor;

[0011] An air circuit system detection module is used to detect the pressure difference between the inlet and outlet air of the air compressor and determine the life of the air filter;

[0012] A cooling system detection module, which is used to detect and control the temperature of the cooling system;

[0013] A running time detection module, which is used for detecting and counting the running status of the air compressor system;

[0014] An output module, the output module is used to output the detection results of the air compressor maintenance and repair detection module, the fault detection module, the oil replacement detection module and the air pressure detection module; the output module is connected to the data acquisition module, and the data acquisition module is connected to the lubrication system detection module, the temperature and humidity detection module, the pressure system detection module, the gas circuit system detection module, the cooling system detection module, and the running time detection module;

[0015] An oil temperature module, which is used to detect the oil temperature of the air compressor;

[0016] The output module is connected to an alarm device, and the alarm device is connected to an oil life detection module, an over-temperature detection module and a pressure early warning detection module.

[0017] Furthermore, the oil temperature module includes:

[0018] An electronic analysis device, wherein an internal capacitor and an external capacitor are fixedly installed on the top of the electronic analysis device, a measuring port is provided below the external capacitor, and an electrolyte is provided in the gap between the internal capacitor and the external capacitor; an oil temperature sensor is provided on the top of the electronic analysis device.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention overcomes the deficiencies and shortcomings of the prior art, proposes a fault diagnosis method for an electric air compressor, and achieves that when the input signal is normal, the frequent start and stop of the air compressor is effectively avoided, the service life of the air compressor is extended, and the water in the air tank is ensured to be discharged in time to avoid water accumulation; at the same time, when the input signal is abnormal, not only can the air pressure value of the entire vehicle be maintained above the brake safety air pressure value at all times to ensure braking safety, but the fault can also be judged in a timely and effective manner, the failure rate of the vehicle can be reduced, and the vehicle operation efficiency can be improved. The state and maintenance time of the water-cooled electric vane air compressor can be predicted, thereby judging the fault diagnosis of the water-cooled electric vane air compressor, and the method has the advantages of controllable detection process and high accuracy of detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a diagram of the fault diagnosis device architecture of the present invention.

[0022] Figure 2 It is a schematic diagram of the overall system flow of the present invention.

[0023] Figure 3 This is a conceptual diagram of the oil life monitoring of the present invention.

[0024] In the figure, the corresponding relationship between the component names and the drawing numbers is as follows:

[0025] 1. Lubrication system detection module; 2. Temperature and humidity detection module; 3. Pressure system detection module; 4. Air system detection module; 5. Cooling system detection module; 6. Running time detection module; 7. Output module; 8. Oil temperature module; 801. Electronic analysis device; 802. Internal capacitor; 803. External capacitor; 804. Measuring port; 805. Oil temperature sensor. DETAILED DESCRIPTION

[0026] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0027] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0029] Example:

[0030] As attached Figure 1 To the attached Figure 3 As shown:

[0031] The present invention provides a vane air compressor fault diagnosis device, comprising a lubrication system detection module 1, the lubrication system detection module 1 is used to detect the operating time of the air compressor and the replacement time of the oil temperature;

[0032] Temperature and humidity detection module 2, which is used to detect the operating temperature of the air compressor and air storage cylinder and alarm;

[0033] Pressure system detection module 3, which is used to detect the pressure parameters of the air compressor;

[0034] The air circuit system detection module 4 is used to detect the pressure difference between the inlet and outlet air of the air compressor and determine the life of the air filter;

[0035] Cooling system detection module 5, the cooling system detection module 5 is used to detect the cooling system temperature and control the cooling system temperature;

[0036] The running time detection module 6 is used for detecting and counting the running status of the air compressor system;

[0037] Output module 7, output module 7 is used to output the detection results of the air compressor maintenance and repair detection module, fault detection module, oil replacement detection module and air pressure detection module; output module 7 is connected to the data acquisition module, and the data acquisition module is connected to the lubrication system detection module 1, temperature and humidity detection module 2, pressure system detection module 3, gas circuit system detection module 4, cooling system detection module 5, and running time detection module 6;

[0038] The oil temperature module 8 is used to detect the oil temperature of the air compressor;

[0039] The output module 7 is connected to an alarm device, which is connected to an oil life detection module, an over-temperature detection module and a pressure early warning detection module.

[0040] The oil temperature module 8 includes:

[0041] An electronic analysis device 801 is provided with an internal capacitor 802 and an external capacitor 803 fixedly mounted on the top of the electronic analysis device 801 , a measuring port 804 is provided below the external capacitor 803 , and an electrolyte is provided in the gap between the internal capacitor 802 and the external capacitor 803 ; an oil temperature sensor 805 is provided on the top of the electronic analysis device 801 .

[0042] By measuring the remaining life of the vane air compressor outlet valve and oil, detecting the air compressor's charging volume, pressurization time, cooling water temperature and mileage, calculating the service life of the air compressor oil and air filter, detecting the air compressor intake pressure, and using the vehicle's historical and current status information, the service life of the air compressor components is predicted to ensure the stability and safety of the vane air compressor, further ensuring the driving safety of the vehicle.

[0043] The diagnostic device of the present invention comprises an engine oil life detection module, an air filter life detection module, a pressure detection module and an engine oil coolant detection module. For example, the engine oil life detection module is composed of an air valve opening times detector and a usage time detector; the air filter life detection module is composed of a flow sensor, a time detector and a mileage detector, which respectively detect the inflation volume, usage time and usage mileage; the pressure detection module and the engine oil coolant detection module respectively include at least one pressure detector, which detects the pressure and temperature conditions of each part through the pressure detector and the temperature detector, and further calculates the pressure and temperature state parameters.

[0044] The specific usage and function of this embodiment are as follows:

[0045] The lubrication system detection module 1, temperature and humidity detection module 2, pressure system detection module 3, gas system detection module 4, cooling system detection module 5, operating time detection module 6 and oil temperature module 8 perform detection feedback and transmit the signal to the data acquisition module, which then detects abnormalities and transmits them to the alarm device through the output module 7 for automatic alarm;

[0046] A diagnostic method for a vehicle water-cooled sliding vane electric air compressor employs the aforementioned diagnostic device for the vehicle water-cooled sliding vane electric air compressor, and the diagnostic method comprises:

[0047] Detect the remaining life of the outlet valve and oil, oil filter, air filter, and oil separator in the water-cooled vane electric air compressor; detect the air compressor charging volume, pressurization time, cooling water temperature, and mileage; calculate the service life of the air compressor oil, air filter, and oil separator; and detect the air compressor intake pressure;

[0048] Output the test results and perform fault diagnosis on the water-cooled sliding vane air compressor.

[0049] Methods for detecting the remaining life of the intake control valve and engine oil:

[0050] Check the number of times the control valve is activated and the length of time it is in use, compare the standard number of times the control valve is activated and the standard service life with that of the engine oil, air filter, and oil separator, and calculate the service life of the engine oil, oil filter, oil separator, and air filter.

[0051] Remaining engine oil life, f0 is the oil change mileage, λ is the real-time viscosity ratio, λ upper limit is the upper limit of the oil viscosity ratio, λ lower limit is the lower limit of the oil viscosity ratio, a is the ratio of the oil mileage to the oil change mileage, F1 is the number of historical oil pressure violations, F2 is the number of historical oil temperature violations, F3 is the number of historical oil water content violations, and F limit is the sum of the historical oil pressure violations, the historical oil temperature violations, and the historical oil water content violations.

[0052] The device also includes a real-time monitoring module (see Figure 1 As shown) and running time cumulative statistics module (historical data statistics unit);

[0053] The real-time monitoring module is used to monitor the oil pressure, air pressure, air filter pressure difference, water temperature, oil filter pressure difference, oil temperature and oil water content in real time;

[0054] The historical data statistics unit is used to compare the real-time oil pressures obtained by monitoring with the preset oil pressure thresholds, and to obtain the number of times the oil pressure has exceeded the limit in history;

[0055] The historical data statistics unit is also used to compare the real-time oil temperature obtained by monitoring with the preset oil temperature threshold, and obtain the number of times the oil temperature exceeds the limit in history;

[0056] The historical data statistics unit is further used to compare each real-time oil water content obtained through monitoring with a preset oil water content threshold value, and obtain statistics on the number of times the oil water content has exceeded the limit in history.

[0057] The data acquisition module and output module 7 is used to collect and send oil replacement reminders when the remaining oil life is lower than the preset oil life warning value;

[0058] The prompt information issuing unit is further used to issue an oil change alarm when the remaining oil life is equal to 0.

[0059] The air outlet control valve in the sliding vane air compressor is the actuator of the electronic control unit, which can control the inflation of the air tank in the air circuit. If it is opened too many times or for too long, it will cause sticking, aging and other phenomena, resulting in a discrepancy between the air pressure control and the actual output, seriously affecting the safety of the entire air circuit control.

[0060] The present invention records the number of times the control valve, engine oil and air filter are used and the duration of their opening in real time during vehicle driving, and then compares the two with the service life or time of the engine oil, engine filter, oil separator core and air filter provided by the manufacturer to provide the remaining service life of the engine oil, engine filter, air filter and oil separator core. When the remaining service life is less than a certain threshold, the driver is prompted to check the status of the control valve and engine oil, engine filter, air filter and oil separator core, and to repair or replace them in time. Furthermore, the two valves can be controlled by a diagnostic instrument to check the actual control effect.

[0061] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. A vane air compressor fault diagnosis device, characterized in that: The diagnostic device includes: A lubrication system detection module (1), the lubrication system detection module (1) is used to detect the operating time of the air compressor and the replacement time of the oil temperature; A temperature and humidity detection module (2), the temperature and humidity detection module (2) is used to detect the operating temperature of the air compressor and the air storage cylinder and to generate an alarm; A pressure system detection module (3), the pressure system detection module (3) is used to detect pressure parameters of the air compressor; An air circuit system detection module (4), the air circuit system detection module (4) is used to detect the pressure difference between the inlet and outlet air of the air compressor and determine the life of the air filter; A cooling system detection module (5), the cooling system detection module (5) is used to detect the temperature of the cooling system and control the temperature of the cooling system; A running time detection module (6), the running time detection module (6) is used for detecting and counting the running status of the air compressor system; An output module (7) is used to output the detection results of the air compressor maintenance and repair detection module, the fault detection module, the oil replacement detection module, and the air pressure detection module; the output module (7) is connected to a data acquisition module, and the data acquisition module is connected to a lubrication system detection module (1), a temperature and humidity detection module (2), a pressure system detection module (3), an air circuit system detection module (4), a cooling system detection module (5), and an operating time detection module (6); An oil temperature module (8) is used to detect the oil temperature of an air compressor; the oil temperature module (8) includes: An electronic analysis device (801) is provided. An internal capacitor (802) and an external capacitor (803) are fixedly arranged on the top of the electronic analysis device (801). A measuring port (804) is provided below the external capacitor (803). An electrolyte is provided in the gap between the internal capacitor (802) and the external capacitor (803). An oil temperature sensor (805) is provided on the top of the electronic analysis device (801). An air filter life detection module is composed of a flow sensor, a time detector, and a mileage detector, which respectively detect the amount of air charged, the usage time, and the usage mileage.

2. A vane air compressor fault diagnosis device according to claim 1, characterized in that: The output module (7) is connected to an alarm device, and the alarm device is connected to an oil life detection module, an air filter life detection module, an over-temperature detection module and a pressure early warning detection module.

3. A vane air compressor fault diagnosis device as claimed in claim 2, characterized in that: The oil life detection module consists of an air valve opening times detector and a usage time detector.

4. A vane air compressor fault diagnosis device as claimed in claim 3, characterized in that: The pressure detection module and the high temperature detection module each include at least one pressure detector, which detects the pressure and temperature conditions of each part through the pressure detector and the temperature detector, and further calculates the pressure and temperature state parameters.

5. A vane air compressor fault diagnosis device as claimed in claim 4, characterized in that: An oil coolant detection module is also provided in the over-temperature detection module.

6. A vane air compressor fault diagnosis device as claimed in claim 5, characterized in that: The number of times the opening frequency detector is activated and the length of time it is used are compared with the standard number of times the control valve is activated and the standard service life of the engine oil, air filter, and oil separator core, and the service life of the engine oil, oil filter, oil separator core, and air filter is calculated.

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