Automobile oil nozzle resistance switching test device and method

Abstract

The invention discloses an automobile oil nozzle resistance switching test device and method, and the device comprises a resistance test unit which is used for measuring the resistance value of an automobile oil nozzle; the switch units are in one-to-one correspondence with the automobile oil nozzles, and two switch ends of each switch unit are connected between the automobile oil nozzles and the resistance testing unit; and the switching control unit is connected to the control ends of the plurality of switch units, the switching control unit is used for controlling the switch units to be switched on one by one, and the resistance testing unit is used for measuring the resistance value of the corresponding automobile oil nozzle. According to the invention, batch testing is realized, the testing efficiency is higher, and the testing result is more accurate.

Description

Technical Field

[0001] The invention relates to a vehicle fuel injection nozzle testing device, in particular to a vehicle fuel injection nozzle resistance switching testing device and method. Background Art

[0002] In traditional fuel injector cleaning and testing equipment, the machine needs to simulate working conditions to test the sealing, uniformity, atomization, fuel injection volume and other parameters of the fuel injector, so as to determine the usage of the fuel injector. However, in actual situations, the resistance value of the fuel injector is also an important criterion for judging its quality. By measuring the resistance of the fuel injector, it can be determined whether the fuel injector is short-circuited, open, or has other abnormalities. If the abnormal resistance of the fuel injector is not detected in time, the fuel injection effect of the fuel injector will be reduced when it is working. The existing method for testing the resistance value of the fuel injector generally uses a multimeter. During the test, the fuel injector is disassembled. For each fuel injector, a multimeter is used separately to measure the resistance value of the fuel injector one by one. This measurement method is not only inefficient, but the connection between the multimeter and the fuel injector is only based on manual touch, and the measurement accuracy is not high. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a resistance switching test device and method for automobile fuel injection nozzles which can realize batch testing, have high testing efficiency and accurate testing results, in view of the deficiencies in the prior art.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0005] A resistance switching test device for automobile fuel injectors comprises: a resistance testing unit for measuring the resistance value of automobile fuel injectors; a plurality of switch units, wherein the switch units correspond to automobile fuel injectors one by one, and two switch ends of the switch units are connected between the automobile fuel injectors and the resistance testing unit; a switching control unit connected to the control ends of the plurality of switch units, wherein the switching control unit is used to control the switching units to be turned on one by one, and the resistance testing unit is used to measure the resistance value of the corresponding automobile fuel injectors.

[0006] Preferably, the switch unit comprises a relay, and two normally open contacts of the relay are respectively connected to the automobile fuel injector and the resistance testing unit.

[0007] Preferably, the switching unit includes an NPN tube, the first end of the coil of the relay is connected to the power supply terminal VDD_5V, the second end of the coil of the relay is connected to the collector of the NPN tube through a first current limiting resistor, the emitter of the NPN tube is grounded, and the base of the NPN tube is connected to the switching control unit through a second current limiting resistor.

[0008] Preferably, a driving board is included, and a plurality of switch units are arranged on the driving board.

[0009] Preferably, a multi-channel fuel injector signal interface is provided on the driving board, and two switch ends of the switch unit are respectively connected to the automobile fuel injector and the resistance testing unit through the multi-channel fuel injector signal interface.

[0010] Preferably, six switch units are provided on the driving board.

[0011] Preferably, the resistance testing unit comprises an SD7501 multimeter testing module.

[0012] A method for switching resistance test of automobile fuel injectors, the method is implemented based on the above-mentioned device, and the method comprises the following steps: step S1, connecting multiple automobile fuel injectors to be tested to multiple switch units one by one; step S2, the switching control unit controls the multiple switch units to be turned on one by one, and then connects the multiple automobile fuel injectors to the resistance test unit one by one; step S3, using the resistance test unit to measure the resistance value of the automobile fuel injectors connected thereto.

[0013] Preferably, the resistance testing unit comprises an SD7501 multimeter testing module. In the step S3, before using the resistance testing unit to perform a measurement task, the resistance testing unit needs to be adjusted to a resistance measurement position.

[0014] Preferably, in step S3, the resistance testing unit collects the current value flowing through the automobile fuel injector. If the current value exceeds a set threshold, a short circuit fault is prompted. If there is no current, an open circuit fault is prompted. If the current value is between 0 and the set threshold, the resistance testing unit calculates the resistance value of the automobile fuel injector in combination with the preset voltage provided by it, and displays the resistance value.

[0015] In the automobile fuel injector resistance switching test device disclosed in the present invention, before the test, a plurality of automobile fuel injectors to be tested are first connected to a plurality of switch units one by one, and then the switch control unit is commanded to be set, and the switch control unit is used to control the plurality of switch units to be turned on one by one. When a certain switch unit is turned on, the corresponding automobile fuel injector can be connected to the resistance test unit. At this time, the resistance test unit can be used to measure the resistance value of the automobile fuel injector, and then determine whether the resistance of the automobile fuel injector meets the application requirements, and make corresponding prompts. After the test is completed, the switch control unit controls the next switch unit to be turned on until all automobile fuel injectors are tested. Compared with the method of manually and individually testing the resistance of the fuel injector using a multimeter in the prior art, the present invention not only realizes batch testing, but also has higher testing efficiency and more accurate test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is a block diagram of the automobile fuel injection nozzle resistance switching test device of the present invention; Figure 2 This is a circuit block diagram of the automobile fuel injection nozzle resistance switching test device of the present invention; Figure 3 Partial principle of the drive plate Figure 1 ; Figure 4 Partial principle of the drive plate Figure 2 ; Figure 5 The present invention is a flow chart of the automobile fuel injection nozzle resistance switching test method. DETAILED DESCRIPTION

[0017] The present invention is described in more detail below with reference to the accompanying drawings and embodiments.

[0018] The invention discloses a resistance switching test device for an automobile fuel injection nozzle, Figure 1 to Figure 2 As shown, it includes: Resistance test unit 1, used to measure the resistance value of the automobile fuel injection nozzle; A plurality of switch units 2, wherein the switch units 2 correspond to the automobile fuel injectors 3 one by one, and two switch ends of the switch units 2 are connected between the automobile fuel injectors 3 and the resistance testing unit 1; The switching control unit 4 is connected to the control ends of the plurality of switch units 2 , and is used to control the switch units 2 to be turned on one by one, and to measure the resistance value of the corresponding automobile fuel injector 3 using the resistance testing unit 1 .

[0019] In the above device, before the test, a plurality of automobile fuel injectors 3 to be tested are connected to a plurality of switch units 2 one by one, and then the switch control unit 4 is set with instructions, and the switch control unit 4 is used to control the plurality of switch units 2 to be turned on one by one. When a certain switch unit 2 is turned on, the corresponding automobile fuel injector 3 can be connected to the resistance test unit 1. At this time, the resistance test unit 1 can be used to measure the resistance value of the automobile fuel injector 3, and then determine whether the resistance of the automobile fuel injector 3 meets the application requirements, and make corresponding prompts. After the test is completed, the switch control unit 4 controls the next switch unit 2 to be turned on until all automobile fuel injectors 3 are tested. Compared with the method of manually and individually testing the resistance of the fuel injector using a multimeter in the prior art, the present invention not only realizes batch testing, but also has higher testing efficiency and more accurate test results.

[0020] See also Figure 2 and Figure 3 In this embodiment, the switch unit 2 includes a relay, and two normally open contacts of the relay are respectively connected to the automobile fuel injector 3 and the resistance testing unit 1.

[0021] Furthermore, the switching unit 2 includes an NPN tube, the first end of the coil of the relay is connected to the power supply terminal VDD_5V, the second end of the coil of the relay is connected to the collector of the NPN tube through a first current limiting resistor, the emitter of the NPN tube is grounded, and the base of the NPN tube is connected to the switching control unit 4 through a second current limiting resistor.

[0022] by Figure 2 Taking a switch unit 2 in the example, when the switching control unit 4 loads a high-level signal to the base of the NPN tube Q56, the NPN tube Q56 is turned on, and at the same time, the second end of the coil of the relay K1 is pulled low, and the coil of the relay K1 is powered on to close its normally open contact, thereby connecting the corresponding automobile fuel injector 3 to the resistance testing unit 1.

[0023] As a preferred method, combined with Figures 2 to 4 As shown, this embodiment includes a driving board 5 , and a plurality of switch units 2 are arranged on the driving board 5 .

[0024] In this embodiment, the driving board 5 is provided with a multi-way fuel injector signal interface, and the two switch ends of the switch unit 2 are respectively connected to the automobile fuel injector 3 and the resistance test unit 1 through the multi-way fuel injector signal interface. The driving board 5 can be connected to the automobile fuel injector 3 and the resistance test unit 1 through a wire.

[0025] In a preferred embodiment of the present invention, six switch units 2 are provided on the driving board 5, but in practical applications, it is not limited to setting six switch units 2, that is, the switch units 2 on the driving board 5 can be other numbers.

[0026] To achieve accurate and reliable resistance testing, in this embodiment, the resistance testing unit 1 includes an SD7501 multimeter testing module.

[0027] The present invention also proposes a method for testing the resistance switching of an automobile fuel injector nozzle. The method is implemented based on the above-mentioned device and comprises the following steps: Step S1, connecting a plurality of automobile fuel injectors 3 to be tested to a plurality of switch units 2 in a one-to-one correspondence; Step S2, the switching control unit 4 controls the multiple switch units 2 to be turned on one by one, thereby connecting the multiple automobile fuel injectors 3 to the resistance testing unit 1 one by one; Step S3, using the resistance testing unit 1 to measure the resistance value of the automobile fuel injection nozzle 3 connected thereto.

[0028] To achieve accurate testing, in this embodiment, the resistance testing unit 1 includes an SD7501 multimeter testing module. In step S3, before using the resistance testing unit 1 to perform a measurement task, the resistance testing unit 1 needs to be adjusted to a resistance measurement position.

[0029] Regarding the specific conversion process of the resistance value, in the step S3 of the present embodiment, the resistance testing unit 1 collects the current value flowing through the automobile fuel injector 3. If the current value exceeds the set threshold, a short circuit fault is prompted. If there is no current, an open circuit fault is prompted. If the current value is between 0 and the set threshold, the resistance testing unit 1 calculates the resistance value of the automobile fuel injector 3 in combination with the preset voltage provided by it, and displays the resistance value.

[0030] In actual applications, after measuring the resistance value of the injector nozzle through the SD7501 multimeter test module, the measured parameter value is transmitted to the preset display interface through UART communication for staff to view.

[0031] Compared with the prior art, the present invention does not need to use measuring tools such as a multimeter to test the fuel injectors individually. During operation, it is only necessary to connect multiple fuel injectors to the device, and the measurement can be completed and the results can be read directly on the operation panel of the device. This not only simplifies the measurement process, but also saves time and manpower. It is particularly suitable for work scenarios such as automobile repair and maintenance, and can significantly improve work efficiency.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the technical scope of the present invention should be included in the scope of protection of the present invention.

Claims

1. A resistance switching test device for an automobile fuel injection nozzle, characterized in that: Included are: Resistance test unit, used to measure the resistance value of automobile fuel injection nozzle; A plurality of switch units, each of which corresponds to a fuel injector of the automobile on a one-to-one basis, and two switch ends of each switch unit are connected between the fuel injector of the automobile and the resistance testing unit; The switching control unit is connected to the control ends of the plurality of switch units, and is used to control the switch units to be turned on one by one, and to use the resistance testing unit to measure the resistance value of the corresponding automobile fuel injector.

2. The automobile fuel injection nozzle resistance switching test device according to claim 1, characterized in that: The switch unit comprises a relay, and two normally open contacts of the relay are respectively connected to the automobile fuel injector and the resistance testing unit.

3. The automobile fuel injection nozzle resistance switching test device as claimed in claim 2, characterized in that: The switching unit includes an NPN tube, a first end of the coil of the relay is connected to the power supply terminal VDD_5V, a second end of the coil of the relay is connected to the collector of the NPN tube through a first current limiting resistor, an emitter of the NPN tube is grounded, and a base of the NPN tube is connected to the switching control unit through a second current limiting resistor.

4. The automobile fuel injection nozzle resistance switching test device according to claim 1, characterized in that: A driving board is included, and a plurality of switch units are arranged on the driving board.

5. The automobile fuel injection nozzle resistance switching test device as claimed in claim 4, characterized in that: The driving board is provided with a multi-channel fuel injector signal interface, and the two switch ends of the switch unit are respectively connected to the automobile fuel injector and the resistance testing unit through the multi-channel fuel injector signal interface.

6. The automobile fuel injection nozzle resistance switching test device as claimed in claim 4, characterized in that: The driving board is provided with 6 switch units.

7. The automobile fuel injection nozzle resistance switching test device according to claim 1, characterized in that: The resistance testing unit includes a SD7501 multimeter testing module.

8. A method for testing the resistance switching of an automobile fuel injection nozzle, characterized in that: The method is implemented based on the device according to any one of claims 1 to 7, and the method comprises the following steps: Step S1, connecting a plurality of automobile fuel injectors to be tested to a plurality of switch units one by one; Step S2, the switching control unit controls the multiple switch units to be turned on one by one, thereby connecting the multiple automobile fuel injectors to the resistance testing unit one by one; Step S3, using the resistance testing unit to measure the resistance value of the automobile fuel injection nozzle connected thereto.

9. The automobile fuel injection nozzle resistance switching test method as claimed in claim 8, characterized in that: The resistance testing unit includes an SD7501 multimeter testing module. In the step S3, before using the resistance testing unit to perform a measurement task, the resistance testing unit needs to be adjusted to a resistance measurement position.

10. The automobile fuel injection nozzle resistance switching test method according to claim 8, characterized in that: In step S3, the resistance testing unit collects the current value flowing through the automobile fuel injector. If the current value exceeds a set threshold, a short circuit fault is prompted. If there is no current, an open circuit fault is prompted. If the current value is between 0 and the set threshold, the resistance testing unit calculates the resistance value of the automobile fuel injector in combination with the preset voltage provided by it, and displays the resistance value.

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