Auxiliary device for low-temperature starting test of automobile

Abstract

The utility model relates to the technical field of automobile low-temperature starting, in particular to an auxiliary device for an automobile low-temperature starting test. Comprising an oil inlet, and the rear end of the oil inlet is sequentially communicated with a first filter screen, an electric handheld oil pump, a second filter screen and an oil outlet through a pipeline; pipelines connected with the front end and the rear end of the electric handheld oil pump are externally connected with backflow pipelines respectively, and the middles of the backflow pipelines are communicated with overflow one-way valves; and the front end of the oil inlet and the rear end of the oil outlet are respectively communicated with equipment joints. The device can quickly check, confirm or eliminate abnormal starting of the engine caused by air inlet factors of the negative pressure section of the low-pressure oil way, is simple to operate and can be quickly implemented on site, the test cost is reduced, and the test efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive low-temperature starting technology, and in particular to an auxiliary device for automotive low-temperature starting test. Background Technology

[0002] Low-temperature starting tests are an essential part of ensuring vehicle performance. As vehicle performance requirements become increasingly stringent, the demands on engines in low-temperature starting tests are also rising, leading to a rapid increase in the cost of low-temperature testing facilities such as low-temperature chambers. Therefore, designing a suitable tool that can quickly troubleshoot certain problems on-site is crucial for improving testing efficiency and ensuring its effectiveness.

[0003] During low-temperature starting tests, various factors can cause difficulty or failure to start the engine, such as air intake in the negative pressure section of the fuel supply system, malfunction of the fuel pump, abnormal pressure build-up in the high-pressure common rail system, and malfunction of the fuel injection system. Among these, air intake in the negative pressure section of the low-pressure fuel line of the fuel supply system is a relatively common problem. Due to the low-temperature characteristics of rubber components and pipe connections, air can enter the negative pressure section of the low-pressure fuel line of the engine's fuel supply system, leading to difficulty or failure to start the vehicle. Once this problem occurs, it cannot be resolved on-site, thus preventing on-site verification of the low-temperature performance of other modules such as the engine fuel pump, high-pressure fuel pump, common rail system, and fuel injection system. The problem must be resolved after the environmental chamber returns to normal temperature before re-entering the environmental chamber to verify the impact of other components on the engine's low-temperature starting performance.

[0004] CN116754236A provides a rapid detection system for engine low-temperature start-up faults, including: a central control system, a battery detection component, a fluid detection component, and a gas temperature detection component; wherein the output terminals of the battery detection component, fluid detection component, and gas temperature detection component are connected to the input terminals of the central control system; it also includes a heating component. However, this prior art has a relatively complex structure and is expensive, mainly suitable for whole vehicles, and not suitable for use in low-temperature start-up tests.

[0005] CN113237665B discloses a cabin-type diesel engine high-altitude low-temperature starting test device and method. The test chamber of this invention is connected to a vacuum pump via a through-chamber pipe, and the test chamber is connected to a second refrigeration unit via a pipe. The first refrigeration unit is connected to a fan via a pipe. The exhaust radiator is sequentially connected to the exhaust buffer tank, vacuum pump, and oil-water separator. The diesel engine starting battery is connected to the diesel engine. The throttle actuator is connected to the engine fuel supply system and the control and data acquisition module. The combustion analyzer is connected to the engine exhaust and the control and data acquisition module at both ends. The ECU and data acquisition module are connected to a display terminal. The fuel heater is connected to the fuel tank via an oil pipe with its own fuel pump, and the exhaust gas is connected to the diesel engine exhaust pipe via a pipe. However, this prior art mainly provides a test chamber, which is also relatively expensive, and does not provide a technical solution for detecting or eliminating air intake in the negative pressure section of the low-pressure fuel circuit. Utility Model Content

[0006] The purpose of this invention is to provide an auxiliary device for low-temperature engine starting tests, which can quickly check and confirm or eliminate the abnormal engine starting caused by air intake factors in the negative pressure section of the low-pressure oil circuit. The device is simple to operate, can be quickly implemented on-site, reduces test costs, and improves test efficiency.

[0007] This utility model provides the following solution.

[0008] An auxiliary device for low-temperature starting test of automobiles includes an oil inlet, the rear end of which is connected in sequence via a pipe to a first filter, an electric hand-held oil pump, a second filter, and an oil outlet; the pipes connected to the front and rear ends of the electric hand-held oil pump are respectively connected to external return pipes, and an overflow check valve is connected in the middle of the return pipes; the front end of the oil inlet and the rear end of the oil outlet are respectively connected to equipment connectors.

[0009] A filter screen is installed to filter impurities in the oil. A return pipeline is installed to prevent damage to the pipeline due to excessive flow or pressure. An overflow check valve is installed to allow excess oil to flow back in one direction, achieving a return effect.

[0010] Furthermore, the front end of the oil inlet and the rear end of the oil outlet are respectively connected to switching valves, and the switching valves are connected to multiple different equipment connectors.

[0011] The corresponding equipment connectors of various components of the vehicle's fuel supply system can be quickly switched by using switching valves to change the direction of fuel flow in the pipeline, thereby quickly connecting the corresponding equipment.

[0012] Furthermore, the front end of the oil inlet is connected to a first switching valve, and the front end of the first switching valve is respectively connected to a first equipment connector that can be connected to the oil outlet port of the fuel tank and a second equipment connector that can be connected to the oil outlet port of the fuel switching valve.

[0013] The first switching valve allows for quick switching between the first and second equipment connectors, connecting to the fuel tank or fuel conversion valve.

[0014] Furthermore, the rear end of the oil outlet is connected to a second switching valve, and the rear end of the second switching valve is connected via a pipe to a third equipment connector that can be connected to the oil inlet port of the fuel pre-filter and a fourth equipment connector that can be connected to the oil inlet port of the engine fuel pump.

[0015] The third and fourth equipment connectors can be quickly switched via the second switching valve, connecting to the fuel pre-filter or the engine fuel pump.

[0016] Furthermore, the rear end of the second switching valve is also connected to a reserved interface.

[0017] The reserved interface is used to connect equipment connectors to other oil circuit components, such as fuel filters and return valves.

[0018] Furthermore, the front end of the oil inlet and the rear end of the oil outlet are respectively connected to a universal interface, which can be detachably connected and communicated with different equipment connectors.

[0019] This connection method has a simpler structure and lower cost.

[0020] Furthermore, the two ends of the return pipe are respectively connected to the pipes connected to the two ends of the electric hand-held oil pump through tee connectors; the tee connectors include a front tee connector set on the pipe between the electric hand-held oil pump and the first filter screen, and a rear tee connector set on the pipe between the electric hand-held oil pump and the second filter screen.

[0021] The tee fitting positioned above prevents filtered oil from mixing with unfiltered oil, while also allowing excess oil to flow back to the front of the electric hand pump.

[0022] Furthermore, a pipe heating device is installed on the pipe between the electric hand-held oil pump and the front tee joint or between the electric hand-held oil pump and the rear tee joint.

[0023] The pipeline heating device is used to heat the oil entering the auxiliary device pipeline, making the oil flow more smoothly, and also preventing negative pressure air intake in the auxiliary device due to low temperature.

[0024] Furthermore, the pipe heating device is a pipe heating belt, which is wrapped around the outer wall of the pipe.

[0025] Using pipe heating tape can meet heating needs while being inexpensive and easy to install and remove.

[0026] Furthermore, all of the pipes are flexible hoses.

[0027] The use of flexible tubing offers good layout flexibility and strong adaptability to the testing environment.

[0028] This utility model has the following advantages compared with the prior art:

[0029] 1. The automotive low-temperature starting test auxiliary device provided by this utility model can directly connect different components of the low-pressure oil circuit of the vehicle fuel supply system through the equipment connector to conduct a sealing test, thereby determining the air intake position.

[0030] 2. The low-temperature starting test auxiliary device for automobiles provided by this utility model can directly bypass the low-pressure oil circuit to conduct low-temperature starting performance tests on other components of the engine fuel supply system. For example, the fuel tank can be directly connected to the engine fuel pump, bypassing the intermediate fuel switching valve and fuel coarse filter, to directly verify the low-temperature starting performance of the engine fuel pump and other modules in the subsequent oil circuit such as the high-pressure fuel pump, common rail fuel system, and fuel injection system.

[0031] 3. The automotive low-temperature starting test auxiliary device provided by this utility model has low manufacturing cost, simple structure, can be quickly connected on site, and is quick and convenient to use.

[0032] 4. The auxiliary device for low-temperature starting test of automobiles provided by this utility model can be replaced and modified with corresponding equipment connectors at any time according to the different fuel supply system structures of various vehicles, and has strong versatility. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Appendix Figure 1 This is a schematic diagram of the structure of the automotive low-temperature starting test auxiliary device described in this utility model;

[0035] Appendix Figure 2 This is a schematic diagram of another embodiment of the automotive low-temperature starting test auxiliary device of this utility model.

[0036] In the picture:

[0037] 1. Oil inlet; 2. First filter screen; 3. Electric handheld oil pump; 4. Second filter screen; 5. Oil outlet; 6. Return pipe; 61. Overflow check valve; 7. Equipment connector; 71. First equipment connector; 72. Second equipment connector; 73. Third equipment connector; 74. Fourth equipment connector; 8. Switching valve; 81. First switching valve; 82. Second switching valve; 9. T-connector; 91. Front t-connector; 92. Rear t-connector; 10. Reserved interface; 11. Pipeline heating device; 12. Universal interface. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0040] It should be understood that the term "and / or" used in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0041] It should be understood that although the terms first, second, third, etc., may be used in the embodiments of this application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, first may also be referred to as second without departing from the scope of the embodiments of this application, and similarly, second may also be referred to as first.

[0042] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0043] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0044] It should be noted that any symbols and / or numbers present in the specification that are not marked in the accompanying drawings are not reference numerals.

[0045] Example 1, please refer to Figure 1 As shown, this embodiment provides an auxiliary device for low-temperature starting tests of automobiles, including an oil inlet 1. The rear end of the oil inlet 1 is connected to a first filter screen 2 via a pipe. The first filter screen 2 is connected to an electric handheld oil pump 3 via a pipe. The rear end of the electric handheld oil pump 3 is connected to a second filter screen 4 via a pipe. The rear end of the second filter screen 4 is connected to an oil outlet 5 via a pipe. A return pipe 6 is also externally connected to the pipes connected to both ends of the electric handheld oil pump 3. An overflow check valve 61 is connected in the middle of the return pipe 6 for one-way return of excess oil. The two ends of the return pipe 6 are respectively connected to the pipes connected to both ends of the electric handheld oil pump 3 via tee connectors 9. The tee connectors 9 include a front tee connector 91 and a rear tee connector 92, which are respectively set on the pipe between the electric handheld oil pump 3 and the first filter screen 2, and on the pipe between the electric handheld oil pump 3 and the second filter screen 4.

[0046] Since the air intake of the negative pressure section of the low-pressure oil circuit may be located in different positions of the fuel supply system, different equipment connectors 7 need to be installed to connect to the oil circuit interfaces of different locations.

[0047] Specifically, the front end of the fuel inlet 1 is connected to a first switching valve 81, and the front end of the first switching valve 81 is connected to a first equipment connector 71 and a second equipment connector 72 via pipes. The first equipment connector 71 can be connected to the fuel tank outlet port, and the second equipment connector 72 can be connected to the fuel switching valve outlet port. The fuel switching valve is a key component used to control the switching of different fuel lines in the fuel system, commonly found in dual-fuel vehicles, dual-fuel tank systems, or scenarios requiring switching between high and low octane fuels; its core function is to ensure the stability and safety of fuel supply and prevent the mixing and combustion of different fuel types. The switching valve 8 can control the switching of different equipment connectors 7, connecting different equipment connectors 7 to the pipelines of auxiliary devices, thereby verifying the airtightness of different parts.

[0048] Similarly, the rear end of the oil outlet 5 is connected to a second switching valve 82, and the rear end of the second switching valve 82 is connected to a third equipment connector 73 and a fourth equipment connector 74 via pipes. The third equipment connector 73 can be connected to the oil inlet port of the fuel pre-filter, and the fourth equipment connector 74 can be connected to the oil inlet port of the engine fuel pump. The fuel pre-filter is connected in series at the front end of the engine fuel pump and is one of the core components of the fuel filtration system. It is mainly used to intercept large particulate impurities in the fuel and separate water, protecting the subsequent fuel pump and precision engine components. The main function of the engine fuel pump is to ensure that the fuel circulates in the low-pressure fuel circuit and to provide sufficient pressure and flow of fuel to the fuel injection pump. Negative pressure intake is also more likely to occur in these two parts.

[0049] The rear end of the second switching valve 82 is also connected to a reserved interface 10 via a pipeline, which is used to connect to equipment connectors 7 of other oil circuit parts, such as fuel filter, return valve, etc.

[0050] In use, first connect each device connector 7 to the corresponding part of the pipeline. In this embodiment, quick-connect connectors are used for plugging and unplugging. Then, adjust the switching valve 8 to connect the pipeline to be verified to the auxiliary device. After that, turn on the electric hand-held fuel pump 3 to fill the fuel line with fuel and then turn it off and start the engine. If it can start normally, it means that there is no air intake in this part of the pipeline and the air tightness is good. If it cannot start normally, it means that there is air intake in this part of the pipeline and the air tightness is poor. For example, connect the first device connector 71 connected to the fuel tank outlet and the third device connector connected to the fuel pre-filter. 73. After opening the electric hand-operated fuel pump to fill the fuel line with fuel, close it and start the engine. This allows you to bypass the intermediate fuel switching valve and directly verify the airtightness of the fuel pre-filter. Connect the first equipment connector 71, which is connected to the fuel tank outlet, and the fourth equipment connector 74, which is connected to the engine fuel pump. After opening the electric hand-operated fuel pump to fill the fuel line with fuel, close it and start the engine. This allows you to bypass the intermediate fuel switching valve and the fuel pre-filter and directly verify the low-temperature starting performance of the engine fuel pump and other modules in the subsequent fuel line, such as the fuel high-pressure pump, common rail system, and fuel injection system.

[0051] Example 2, please refer to Figure 2 As shown, this embodiment provides an auxiliary device for low-temperature starting test of automobiles, and provides another connection method for the device connector 7 based on embodiment 1.

[0052] Specifically, the front end of the oil inlet 1 and the rear end of the oil outlet 5 are respectively connected to a universal interface 12. The universal interface 12 can be used to detachably connect with the various equipment connectors 7 mentioned above. For example, the universal interface 12 in this embodiment is a universal internal thread interface. The various equipment connectors 7, including the first equipment connector 71, the second equipment connector 72, the third equipment connector 73, the fourth equipment connector 74, and the equipment connectors 7 used to connect to other oil circuit parts, are all provided with external thread interfaces that match the universal internal thread interface. They can all be connected and communicated with the front end of the oil inlet 1 or the rear end of the oil outlet 5 through the universal internal thread interface and the external thread interface. When using, you only need to replace the corresponding equipment connector 7 as needed.

[0053] Although replacing the equipment connector 7 in this embodiment is not as convenient as in embodiment 1, the structure is simpler and the cost is lower.

[0054] Example 3, please refer to Figure 2 As shown, this embodiment provides an auxiliary device for low-temperature starting test of automobiles, which adds a pipeline heating device 11 based on embodiment 1 or 2.

[0055] Specifically, a pipe heating tape is wrapped around the outer wall of the pipe between the electric hand-held oil pump 3 and the front or rear tee connector 9 to heat the oil entering the auxiliary device pipe, making the oil flow more smoothly and preventing negative pressure air intake in the auxiliary device due to low temperature; other pipe heating devices 11 can also be added to the above-mentioned parts.

[0056] All pipes described in this embodiment of the utility model are flexible hoses, and proper sealing is required at the connection points with each component.

[0057] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An auxiliary device for automobile low-temperature starting test, characterized in that, It includes an oil inlet (1), and the rear end of the oil inlet (1) is connected in sequence to a first filter screen (2), an electric hand-held oil pump (3), a second filter screen (4) and an oil outlet (5) via a pipe; the pipes connected to the front and rear ends of the electric hand-held oil pump (3) are also connected to external return pipes (6), and the middle of the return pipes (6) is connected to an overflow check valve (61); the front end of the oil inlet (1) and the rear end of the oil outlet (5) are respectively connected to equipment connectors (7).

2. The auxiliary device for low-temperature starting test of automobiles according to claim 1, characterized in that, The front end of the oil inlet (1) and the rear end of the oil outlet (5) are respectively connected to a switching valve (8), and the switching valve (8) is connected to multiple different equipment connectors (7).

3. The auxiliary device for low-temperature starting test of automobiles according to claim 2, characterized in that, The front end of the oil inlet (1) is connected to a first switching valve (81), and the front end of the first switching valve (81) is connected to a first equipment connector (71) that can be connected to the oil outlet port of the oil tank and a second equipment connector (72) that can be connected to the oil outlet port of the fuel switching valve.

4. The auxiliary device for low-temperature starting test of automobiles according to claim 2, characterized in that, The rear end of the oil outlet (5) is connected to a second switching valve (82), and the rear end of the second switching valve (82) is connected to a third equipment connector (73) that can be connected to the oil inlet port of the fuel coarse filter and a fourth equipment connector (74) that can be connected to the oil inlet port of the engine fuel pump.

5. The auxiliary device for low-temperature starting test of automobiles according to claim 4, characterized in that, The rear end of the second switching valve (82) is also connected to a reserved interface (10).

6. The auxiliary device for low-temperature starting test of automobiles according to claim 1, characterized in that, The front end of the oil inlet (1) and the rear end of the oil outlet (5) are respectively connected to a universal interface (12), which can be detachably connected to and communicated with different equipment connectors (7).

7. The auxiliary device for low-temperature starting test of automobiles according to claim 1, characterized in that, The two ends of the return pipe (6) are connected to the pipes connected to both ends of the electric hand pump (3) via tee connectors (9); the tee connectors (9) include a front tee connector (91) on the pipe between the electric hand pump (3) and the first filter screen (2), and a rear tee connector (92) on the pipe between the electric hand pump (3) and the second filter screen (4).

8. The auxiliary device for low-temperature starting test of automobiles according to claim 7, characterized in that, A pipe heating device (11) is provided on the pipe between the electric hand-held oil pump (3) and the front tee connector (91) or between the electric hand-held oil pump (3) and the rear tee connector (92).

9. The auxiliary device for low-temperature starting test of automobiles according to claim 8, characterized in that, The pipe heating device (11) is a pipe heating belt, which is wrapped around the outer wall of the pipe.

10. The auxiliary device for low-temperature starting test of automobiles according to any one of claims 1-9, characterized in that, All the pipes are flexible hoses.

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