System and method for rapidly measuring electrical performance of electromagnetic valve of engine

Abstract

The invention discloses a system and a method for rapidly measuring the electrical performance of an engine solenoid valve, and solves the technical problems that the existing measurement method is difficult to measure multiple electrical performances of a multichannel product solenoid valve at the same time, the measurement efficiency is low, the accuracy of a measurement result is difficult to guarantee, and the like. The measuring system comprises a main control unit, a display unit and a plurality of measuring units, the measuring unit comprises a resistance measuring module, a current measuring module and a voltage measuring module. The input ends of the resistance measurement module, the current measurement module and the voltage measurement module are respectively connected with corresponding electromagnetic valves to be measured, and the output ends are respectively connected with the main control unit; the main control unit is connected with the display unit and is used for receiving and storing resistance, current and terminal voltage information of the to-be-tested solenoid valve and displaying the information in real time through the display unit. The measurement system can realize simultaneous measurement of the electrical performance of the multi-channel product solenoid valve, and the reliability of the measurement result is high.

Description

Technical Field

[0001] This invention relates to a method for measuring engine solenoid valves, specifically to a rapid measurement system and method for the electrical performance of engine solenoid valves. Background Technology

[0002] Based on the testing requirements of the attitude control engine, after the engine product is installed on the test bench, the operator needs to measure and confirm the resistance, terminal voltage and circuit current of each solenoid valve to ensure that its performance meets the test requirements of the engine.

[0003] Existing measurement methods connect the control channel to the solenoid valve via an electrical connector and then use a traditional multimeter to complete the measurement, which basically meets the measurement requirements of the solenoid valve's electrical performance. However, this method requires measuring resistance, voltage, and loop current in three steps sequentially, and can only complete the measurement of one solenoid valve at a time. As the number of test tasks increases and the test pace accelerates, the existing measurement method is unable to simultaneously measure multiple electrical performance characteristics of multi-channel solenoid valves, and cannot obtain the valve response time of each solenoid valve in a timely manner, thus affecting the test progress. In addition, the existing measurement method requires manual recording of measurement results, which is prone to errors and difficult to verify, resulting in low measurement efficiency and difficulty in guaranteeing the accuracy of the measurement results. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problems of existing measurement methods, such as difficulty in simultaneously measuring multiple electrical properties of multi-channel product solenoid valves, low measurement efficiency, and difficulty in guaranteeing the accuracy of measurement results, and to provide a rapid measurement system and method for the electrical properties of engine solenoid valves.

[0005] To achieve the above objectives, the technical solution provided by this invention is as follows: A rapid measurement system for the electrical performance of an engine solenoid valve is characterized by comprising a main control unit, a display unit, and multiple measurement units; the multiple measurement units are connected one-to-one with multiple solenoid valves of the engine. Each of the measurement units includes a resistance measurement module, a current measurement module, and a voltage measurement module; the input terminals of the resistance measurement module, current measurement module, and voltage measurement module are respectively used to connect to the corresponding solenoid valve under test, and the output terminals are respectively connected to the main control unit; the resistance measurement module, current measurement module, and voltage measurement module are respectively used to measure the resistance, current, and terminal voltage of the solenoid valve under test, and synchronously feed them back to the main control unit; The main control unit is connected to the display unit and is used to receive and store the resistance, current and terminal voltage information of the solenoid valve under test, and display it in real time through the display unit.

[0006] Furthermore, it also includes multiple current monitoring modules; each current monitoring module includes a current monitoring circuit, a first filtering and amplifying circuit, and a first sampling circuit connected in sequence; wherein, the input terminal of the current monitoring circuit is used to connect to the corresponding solenoid valve under test, and after collecting its loop current, it is transmitted to the first sampling circuit after passing through the first filtering and amplifying circuit; the first sampling circuit is a 24-bit ADC sampling circuit, and its output terminal is used to connect to the engine control system, and the first sampling circuit is used to collect the filtered loop current and transmit it to the engine control system.

[0007] Furthermore, the resistance measurement module includes a resistance measurement circuit, a second filtering and amplification circuit, and a second sampling circuit connected in sequence; The input terminal of the resistance measurement circuit is used to connect to the corresponding solenoid valve under test. The resistance of the corresponding solenoid valve under test is acquired through a four-wire method and transmitted to the second sampling circuit after passing through the second filter and amplification circuit. The second sampling circuit is a 24-bit ADC sampling circuit, and its output is connected to the main control unit.

[0008] Furthermore, the current measurement module includes a first conditioning module and a third sampling circuit; the input terminal of the first conditioning module is used to connect to the corresponding solenoid valve under test, and to isolate and filter the current of the solenoid valve under test; the output terminal of the first conditioning module is connected to the third sampling circuit, which is a 24-bit ADC sampling circuit, and its output terminal is connected to the main control unit. The voltage measurement module includes a second conditioning module and a fourth sampling circuit; the input terminal of the second conditioning module is used to connect to the corresponding solenoid valve under test, and to isolate and filter the terminal voltage of the solenoid valve under test; the output terminal of the second conditioning module is connected to the fourth sampling circuit; the fourth sampling circuit is a 24-bit ADC sampling circuit, and its output terminal is connected to the main control unit.

[0009] Furthermore, the third and fourth sampling circuits acquire data synchronously and in parallel.

[0010] Furthermore, the main control unit is an ARM processor.

[0011] Furthermore, the multiple measurement units are integrated into a single measurement channel and are independent of each other.

[0012] Meanwhile, this invention also provides a rapid measurement method for the electrical performance of an engine solenoid valve, characterized by the following steps: Step 1: Assemble the above-mentioned rapid measurement system for the electrical performance of engine solenoid valves, wherein the number of measurement units corresponds one-to-one with the number of solenoid valves to be tested; Step 2: The engine control system sends corresponding control signals to each solenoid valve according to the test requirements, so that it is in the corresponding working state; Step 3: Measure the resistance, current and terminal voltage of the corresponding solenoid valve under test through the resistance measurement module, current measurement module and voltage measurement module respectively, and transmit the data to the main control unit. Step 4: The main control unit stores the resistance, current and terminal voltage of the corresponding solenoid valve under test and displays them in real time, thereby realizing the rapid measurement of the electrical performance of the engine solenoid valve.

[0013] Furthermore, step 2 also includes collecting the loop current after the solenoid valve under test through the current monitoring module to monitor the constant current source.

[0014] Furthermore, step 3 specifically involves: The resistance of the corresponding solenoid valve under test is acquired by the resistance measurement circuit in the resistance measurement module in a four-wire manner, and then transmitted to the main control unit after passing through the second filter amplifier circuit and the second sampling circuit in sequence. The current of the corresponding solenoid valve under test is isolated and filtered by the first conditioning circuit in the current measurement module, and then collected and transmitted to the main control unit by the third sampling circuit. The voltage of the corresponding solenoid valve under test is isolated and filtered by the second conditioning module in the voltage measurement module, and then collected and transmitted to the main control unit by the fourth sampling circuit.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention provides a rapid measurement system for the electrical performance of an engine solenoid valve. It can not only simultaneously measure the resistance, current and terminal voltage of the solenoid valve under test through a resistance measurement module, a current measurement module and a voltage measurement module, but also obtain its opening and closing time by combining the current change curve of the solenoid valve under test, and the measurement results are highly reliable; at the same time, it can also combine multiple measurement units to realize the synchronous measurement of solenoid valves of multi-channel products, and the measurement efficiency is high.

[0016] 2. The present invention provides a rapid measurement system for the electrical performance of an engine solenoid valve, which also includes multiple current monitoring modules to monitor the constant current source reaching the corresponding solenoid valve under test, thereby adjusting the constant current source value and ensuring the accuracy and stability of the constant current source output.

[0017] 3. In the rapid measurement system for the electrical performance of an engine solenoid valve provided by the present invention, a first filtering amplification circuit and a second filtering amplification circuit are respectively provided in the current monitoring module and the resistance measurement module. At the same time, a first conditioning module is provided in the current measurement module and a second conditioning module is provided in the voltage measurement module, thereby greatly improving the measurement accuracy of the measurement system.

[0018] 4. In the rapid measurement system for the electrical performance of an engine solenoid valve provided by the present invention, the resistance measurement circuit acquires the resistance of the corresponding solenoid valve under test through a four-wire method, thereby eliminating lead resistance errors in the acquisition process and improving measurement accuracy.

[0019] 5. In the rapid measurement system for the electrical performance of an engine solenoid valve provided by this invention, the third sampling circuit and the fourth sampling circuit acquire data synchronously and in parallel, further improving the measurement efficiency.

[0020] 6. In the rapid measurement system for the electrical performance of an engine solenoid valve provided by the present invention, the first sampling circuit, the second sampling circuit, the third sampling circuit and the fourth sampling circuit all adopt 24-bit ADC sampling circuits, which have the advantages of high integration, strong data consistency and high sampling efficiency.

[0021] 7. In the rapid measurement system for the electrical performance of an engine solenoid valve provided by the present invention, the main control unit adopts an ARM processor, which has the advantages of low power consumption, high efficiency, high integration, high flexibility, and low development cost. It can not only improve the integration of the measurement system, but also greatly improve the measurement efficiency.

[0022] 8. The present invention provides a rapid measurement method for the electrical performance of an engine solenoid valve, which is simple to operate, highly efficient, requires no manual recording of measurement results, and allows for faster data review. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an embodiment of a rapid measurement system for the electrical performance of an engine solenoid valve according to the present invention.

[0024] Figure 2 This is a schematic diagram of the current output monitoring unit in an embodiment of a rapid measurement system for the electrical performance of an engine solenoid valve according to the present invention.

[0025] Figure 3 This is a schematic diagram of the resistance measurement module in an embodiment of a rapid measurement system for the electrical performance of an engine solenoid valve according to the present invention.

[0026] Figure 4 This is a schematic diagram of the current measurement module in an embodiment of a rapid measurement system for the electrical performance of an engine solenoid valve according to the present invention.

[0027] Figure 5 This is a current change curve during the opening process of the solenoid valve in an embodiment of the rapid measurement method for the electrical performance of an engine solenoid valve according to the present invention.

[0028] Figure 6 This is a current change curve of the solenoid valve under test during the closing process, as shown in an embodiment of the rapid measurement method for the electrical performance of an engine solenoid valve according to the present invention. Detailed Implementation

[0029] With the proliferation of attitude control engine models, the types and types of test tasks have also increased. To adapt to the increasingly fast pace of work, it is particularly important to effectively improve work efficiency and simplify work steps. In order to meet the test requirements and improve efficiency, the current valve performance testing device needs to be further optimized. The optimized device should have the following three functions: (1) Simultaneously complete the electrical performance test of 40 product valves and output the valve electrical performance table, including valve resistance, terminal voltage, current and valve response time; (2) Have functions such as automatic statistical analysis of test data and automatic generation of test data tables from historical test data; (3) In order to further adapt to the current tight test frequency, this application has made design innovations to the existing solenoid valve performance measurement system.

[0030] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0031] like Figure 1 As shown, this embodiment provides a rapid measurement system for the electrical performance of engine solenoid valves, including a main control unit, a display unit, and multiple measurement units; the multiple measurement units are connected one-to-one with multiple solenoid valves of the engine.

[0032] Each measurement unit includes a resistance measurement module, a current measurement module, and a voltage measurement module. The input terminals of these modules are connected to the corresponding solenoid valve under test, and their output terminals are connected to the main control unit. The resistance, current, and voltage measurement modules are used to measure the resistance, current, and terminal voltage of the solenoid valve under test, and synchronously feed these measurements back to the main control unit.

[0033] The main control unit is connected to the display unit and is used to receive and store the resistance, current, and terminal voltage information of the solenoid valve under test, and display it in real time through the display unit. In this embodiment, the main control unit is an ARM processor, which is mainly responsible for controlling other circuit functions and communicating with the upper-level monitoring host. The display unit is an LCD screen connected to the ARM processor. The software used in the measurement system of this embodiment is divided into two parts: embedded ARM software and upper-level monitoring software. The two parts of the software interact with each other through Ethernet. The embedded ARM software runs in the embedded ARM processor and controls the constant current output, test channel switching, and resistance measurement of the solenoid valve under test according to the upper-level control instructions; the upper-level monitoring software is human-computer interaction software, including system settings, test parameter settings, test control, data display, and management.

[0034] Preferably, this embodiment also includes multiple current monitoring modules. The engine control system outputs a corresponding constant current source to the solenoid valve under test to achieve constant current excitation. Therefore, the resistance measurement unit mainly measures the resistance of the solenoid valve under test through constant current excitation.

[0035] like Figure 2 As shown, the current monitoring module includes a current monitoring circuit, a first filtering and amplifying circuit, and a first sampling circuit connected in sequence. The input of the current monitoring circuit is connected to the corresponding solenoid valve under test, used to collect its loop current and transmit it to the first filtering and amplifying circuit. The first filtering and amplifying circuit filters and amplifies the loop current before transmitting it to the first sampling circuit. The first sampling circuit is a 24-bit ADC sampling circuit, whose output is connected to the engine's control system. The first sampling circuit collects the filtered and amplified loop current and transmits it to the engine's control system. The engine's control system compares this loop current with the output constant current source and adjusts the magnitude of the constant current source based on the comparison result.

[0036] like Figure 3 As shown, the resistance measurement module in this embodiment includes a resistance measurement circuit, a second filtering and amplification circuit, and a second sampling circuit connected in sequence. The input terminal of the resistance measurement circuit is connected to the corresponding solenoid valve under test, and is used to acquire the resistance of the corresponding solenoid valve under test in a four-wire manner. After filtering and amplification by the second filtering and amplification circuit, the resistance is transmitted to the second sampling circuit. The second sampling circuit is a 24-bit ADC sampling circuit, and its output terminal is connected to the main control unit. It is used to transmit the resistance of the corresponding solenoid valve under test to the main control unit in real time, thereby realizing the real-time measurement of the resistance of the corresponding solenoid valve under test.

[0037] like Figure 4 As shown, the current measurement module includes a first conditioning module and a third sampling circuit. The input of the first conditioning module is used to connect to the corresponding solenoid valve under test and to isolate and filter the current of the solenoid valve under test. The output of the first conditioning module is connected to the third sampling circuit, which is a 24-bit ADC sampling circuit. Its output is connected to the main control unit and is used to transmit the current of the corresponding solenoid valve under test to the main control unit in real time, so as to realize the real-time measurement of the current of the corresponding solenoid valve under test, and then calculate the opening and closing time of the solenoid valve under test based on the current curve.

[0038] The voltage measurement module includes a second conditioning module and a fourth sampling circuit (with...). Figure 4 (The structures shown are the same). The input terminal of the second conditioning module is used to connect to the corresponding solenoid valve under test, and to isolate and filter the terminal voltage of the solenoid valve under test. The output terminal of the second conditioning module is connected to the fourth sampling circuit. The fourth sampling circuit is a 24-bit ADC sampling circuit, and its output terminal is connected to the main control unit to transmit the terminal voltage of the corresponding solenoid valve under test to the main control unit in real time, so as to realize the real-time measurement of the terminal voltage of the corresponding solenoid valve under test.

[0039] In this embodiment, the first and second conditioning modules can employ filters, with an isolation module incorporated into the filters to achieve isolation and filtering of current or terminal voltage, thereby improving the accuracy of the acquired information. Simultaneously, the third and fourth sampling circuits acquire data in parallel, enabling synchronous acquisition of current and terminal voltage, thus improving measurement efficiency.

[0040] Preferably, multiple measurement units can be integrated into one measurement channel and operate independently of each other. The input end of each measurement unit is connected to the corresponding solenoid valve under test, and the output end is connected to the main control unit, thereby improving the integration of the measurement system.

[0041] To achieve simultaneous measurement of the resistance of multiple solenoid valves under test, the main control unit can control the matrix switching unit to achieve the measurement of the resistance of multiple solenoid valves. The matrix switching unit is connected to the solenoid valve under test.

[0042] Furthermore, this embodiment also provides a rapid measurement method for the electrical performance of an engine solenoid valve, including the following steps: Step 1: Assemble a rapid measurement system for the electrical performance of engine solenoid valves, wherein the number of measurement units corresponds one-to-one with the number of solenoid valves to be tested.

[0043] Step 2: The engine control system sends corresponding control signals to each solenoid valve under test according to the test requirements, so that it is in the corresponding working state.

[0044] To ensure that the engine control system outputs a stable and high-precision constant current source (50mA) to the solenoid valve under test, the loop current after the solenoid valve under test can be collected by the current monitoring module. The loop current is compared with the constant current source, and the constant current output of the VI circuit is controlled by adjusting the DAC in real time. That is, the closed-loop correction current method is used to ensure the accuracy and stability of the constant current source output.

[0045] Step 3: Measure the resistance, current, and terminal voltage of the corresponding solenoid valve under test using the resistance measurement module, current measurement module, and voltage measurement module respectively, and transmit the data to the main control unit; specifically: The resistance of the corresponding solenoid valve under test is acquired by the resistance measurement circuit in the resistance measurement module in a four-wire manner, and then transmitted to the main control unit after passing through the second filter amplifier circuit and the second sampling circuit in sequence.

[0046] The current of the corresponding solenoid valve under test is isolated and filtered by the first conditioning circuit in the current measurement module, and then collected and transmitted to the main control unit by the third sampling circuit.

[0047] The voltage of the corresponding solenoid valve under test is isolated and filtered by the second conditioning module in the voltage measurement module, and then collected and transmitted to the main control unit by the fourth sampling circuit.

[0048] Step 4: The main control unit stores the resistance, current and terminal voltage of the corresponding solenoid valve under test and displays them in real time, thereby realizing the rapid and synchronous measurement of the electrical performance of multiple solenoid valves of the engine.

[0049] Based on the above measurements, the opening and closing times of the solenoid valve under test can be further tested, based on the current curve during the opening process of the solenoid valve under test. Figure 5 As shown in the figure, the solenoid valve under test will have one or more abrupt changes during the opening process. The current from the start of the change to the lowest point of the last abrupt change is the opening time of the solenoid valve under test; similarly, based on the current curve of the closing process of the solenoid valve under test (… Figure 6 As shown in the figure, the solenoid valve under test will have one or more abrupt changes during the closing process. The current from the start of the change to the highest point of the last abrupt change is the closing time of the solenoid valve under test.

[0050] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, and such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A rapid measurement system for the electrical performance of an engine solenoid valve, characterized in that: It includes a main control unit, a display unit, and multiple measurement units; the multiple measurement units are connected one-to-one with multiple solenoid valves of the engine; Each of the measurement units includes a resistance measurement module, a current measurement module, and a voltage measurement module; the input terminals of the resistance measurement module, current measurement module, and voltage measurement module are respectively used to connect to the corresponding solenoid valve under test, and the output terminals are respectively connected to the main control unit; the resistance measurement module, current measurement module, and voltage measurement module are respectively used to measure the resistance, current, and terminal voltage of the solenoid valve under test, and synchronously feed them back to the main control unit; The main control unit is connected to the display unit and is used to receive and store the resistance, current and terminal voltage information of the solenoid valve under test, and display it in real time through the display unit.

2. The rapid measurement system for the electrical performance of an engine solenoid valve according to claim 1, characterized in that: It also includes multiple current monitoring modules; each current monitoring module includes a current monitoring circuit, a first filtering and amplifying circuit, and a first sampling circuit connected in sequence; wherein, the input terminal of the current monitoring circuit is used to connect to the corresponding solenoid valve under test, and after collecting its loop current, it is transmitted to the first sampling circuit after passing through the first filtering and amplifying circuit; the first sampling circuit is a 24-bit ADC sampling circuit, and its output terminal is used to connect to the engine control system, and the first sampling circuit is used to collect the filtered loop current and transmit it to the engine control system.

3. The rapid measurement system for the electrical performance of an engine solenoid valve according to claim 1 or 2, characterized in that: The resistance measurement module includes a resistance measurement circuit, a second filter amplification circuit, and a second sampling circuit connected in sequence. The input terminal of the resistance measurement circuit is used to connect to the corresponding solenoid valve under test. The resistance of the corresponding solenoid valve under test is acquired through a four-wire method and transmitted to the second sampling circuit after passing through the second filter and amplification circuit. The second sampling circuit is a 24-bit ADC sampling circuit, and its output is connected to the main control unit.

4. The rapid measurement system for the electrical performance of an engine solenoid valve according to claim 1, characterized in that: The current measurement module includes a first conditioning module and a third sampling circuit; the input terminal of the first conditioning module is used to connect to the corresponding solenoid valve under test, and to isolate and filter the current of the solenoid valve under test; the output terminal of the first conditioning module is connected to the third sampling circuit, which is a 24-bit ADC sampling circuit, and its output terminal is connected to the main control unit. The voltage measurement module includes a second conditioning module and a fourth sampling circuit; the input terminal of the second conditioning module is used to connect to the corresponding solenoid valve under test, and to isolate and filter the terminal voltage of the solenoid valve under test; the output terminal of the second conditioning module is connected to the fourth sampling circuit; the fourth sampling circuit is a 24-bit ADC sampling circuit, and its output terminal is connected to the main control unit.

5. The rapid measurement system for the electrical performance of an engine solenoid valve according to claim 4, characterized in that: The third and fourth sampling circuits acquire data synchronously and in parallel.

6. The rapid measurement system for the electrical performance of an engine solenoid valve according to claim 1, characterized in that: The main control unit is an ARM processor.

7. The rapid measurement system for the electrical performance of an engine solenoid valve according to claim 1, characterized in that: The multiple measurement units are integrated into one measurement channel and are independent of each other.

8. A rapid measurement method for the electrical performance of an engine solenoid valve, characterized in that, Includes the following steps: Step 1: Assemble the rapid measurement system for the electrical performance of the engine solenoid valve according to any one of claims 1 to 7, wherein the number of measurement units corresponds one-to-one with the number of solenoid valves to be tested; Step 2: The engine control system sends corresponding control signals to each solenoid valve according to the test requirements, so that it is in the corresponding working state; Step 3: Measure the resistance, current and terminal voltage of the corresponding solenoid valve under test through the resistance measurement module, current measurement module and voltage measurement module respectively, and transmit the data to the main control unit. Step 4: The main control unit stores the resistance, current and terminal voltage of the corresponding solenoid valve under test and displays them in real time, thereby realizing the rapid measurement of the electrical performance of the engine solenoid valve.

9. The rapid measurement method for the electrical performance of an engine solenoid valve according to claim 8, characterized in that: Step 2 also includes collecting the loop current after the solenoid valve under test through the current monitoring module to monitor the constant current source.

10. The rapid measurement method for the electrical performance of an engine solenoid valve according to claim 9, characterized in that, Step 3 specifically involves: The resistance of the corresponding solenoid valve under test is acquired by the resistance measurement circuit in the resistance measurement module in a four-wire manner, and then transmitted to the main control unit after passing through the second filter amplifier circuit and the second sampling circuit in sequence. The current of the corresponding solenoid valve under test is isolated and filtered by the first conditioning circuit in the current measurement module, and then collected and transmitted to the main control unit by the third sampling circuit. The voltage of the corresponding solenoid valve under test is isolated and filtered by the second conditioning module in the voltage measurement module, and then collected and transmitted to the main control unit by the fourth sampling circuit.

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