An engine fuel injection pump performance test platform

Abstract

The application discloses an engine fuel injection pump performance test platform and relates to the technical field of fuel injection pump performance test.The application comprises a test table, a test drive is installed on the test table, a mounting seat is installed on the upper surface of the test table, a fuel injection pump with a thermocouple is installed on the mounting seat, a test cover is slidably connected to the upper surface of the test table, electric heating radiators are linearly arranged on the inner wall of the test cover, an independent cold cavity is arranged on the outer side of the test cover, and the cold cavity can be connected with the test cover.Through the double-environment cavity formed by the test cover and the cold cavity, the inside of the test cover simulates a high-temperature environment, the cold cavity simulates high-speed cooling air flow, a heating surface simulates a hot radiation surface close to an engine cabin, and a windward surface simulates a wind surface of a fuel injection pump in the process of vehicle driving, so that the test result is closer to reality, and the extreme transient working condition of high-speed impact of a car into rain or alternating impact of high-temperature and low-temperature air can be accurately simulated.

Description

Technical Field

[0001] This invention relates to the field of fuel injection pump performance testing technology, and more specifically to a fuel injection pump performance testing platform for engines. Background Technology

[0002] As the "heart" of a diesel engine's fuel supply system, the performance of the fuel injection pump (including fuel supply quantity, pressure stability, response speed, efficiency, and thermal load capacity) directly determines the engine's power, economy, emissions levels, and reliability. Therefore, comprehensive and accurate testing of its performance is a necessary step in product development, quality control, and fault diagnosis.

[0003] Patent CN222797678U discloses a high-pressure fuel injection pump testing device, including a machine base with a left-right movable motor mounted on it. An adjustable support plate is located on one side of the motor, and the fuel injection pump is placed on the support plate. A pressure plate is mounted on the support plate, pressing down on the fuel injection pump. A first connector is connected to the motor shaft extension, and a second connector is connected to the camshaft of the fuel injection pump. The first and second connectors are detachably connected. Support baffles are connected to both sides of the support plate, and adjusting seats are connected to the support baffles. A thermal probe and a displacement sensor are mounted on the adjusting seats, facing the plunger position inside the fuel injection pump. Compared with existing technologies, this high-pressure fuel injection pump testing device allows for quick connection between the fuel injection pump and the motor via connectors. The thermal probe and displacement sensor on the support plate measure temperature changes and deformation, providing test data and supporting improvements in the housing material of the high-pressure fuel injection pump.

[0004] The patent and existing technologies have the following technical problems in practical use:

[0005] 1. The aforementioned patent simply measures the heat and deformation of the fuel injection pump housing. These parameters are isolated and not synchronously or correlated with the core hydraulic performance of the fuel injection pump, namely, the decrease in fuel supply, increase in leakage, and changes in pressure fluctuation rate under hot conditions. Therefore, it cannot assess heat-induced performance degradation. The ultimate goal of thermal performance testing is to evaluate the negative impact of high temperatures on functionality. This device lacks the equipment and interface to simultaneously measure fuel supply, efficiency, and sealing performance under high-temperature conditions, thus failing to quantify the crucial indicator of "how much performance decreases due to temperature increase."

[0006] 2. This device only measures the heat generated by the fuel injection pump itself (self-generated heat), and cannot simulate the real thermal environment. In a real engine, the fuel injection pump also experiences external heat loads from high-temperature air convection in the engine compartment and heat radiation from nearby high-temperature components (such as the exhaust manifold). This device cannot simulate this crucial external heating at all, therefore the measured temperature is far lower than the actual operating conditions. Furthermore, it cannot simulate the performance of the fuel injection pump under extreme conditions, such as extreme transient conditions like a car plunging into rain at high speed or alternating high and low temperature air impacts. The test conditions are too mild and lack challenge and realism. Summary of the Invention

[0007] The purpose of this invention is to provide a performance testing platform for an engine fuel injection pump in order to solve the above problems.

[0008] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0009] A performance testing platform for an engine fuel injection pump includes a test bench, a test drive mounted on the test bench, a mounting base mounted on the upper surface of the test bench, a fuel injection pump with a thermocouple attached mounted on the mounting base, a test cover slidably connected to the upper surface of the test bench, an electrothermal radiation plate linearly arrayed on the inner wall of the test cover, and an independent cold chamber provided on the outer side of the test cover, which can communicate with the test cover.

[0010] The test bench is equipped with a cooling tank, a return oil pump, a storage tank, and an inlet oil pump. The return oil pump can deliver the cooled fuel in the cooling tank to the storage tank. The upper surface of the test bench is equipped with an inlet pipe, and the inlet oil pump can deliver the fuel in the storage tank to the inlet pipe. A return oil connection pipe is suspended from the top of the inner part of the test cover. The return oil connection pipe is connected to the cooling tank through the return oil main pipe. Several branch pipes are installed on the return oil connection pipe, and flow meters, temperature sensors, and pressure control valves are installed on the branch pipes.

[0011] Furthermore, the test cover consists of a cover frame and a telescopic cover plate. The cover frame has a sliding window inside, and the telescopic cover plate is set in the sliding window. The inner bottom and inner top of the sliding window have grooves. Supporting slide rods are provided at the fold positions on the inner side of the telescopic cover plate. The supporting slide rods are slidably connected in the grooves. The electrothermal radiation plate is fixedly installed on the supporting slide rods. A supporting window plate is provided in the middle of the telescopic cover plate. The cold chamber is fixedly installed on the supporting window plate. The main body of the cold chamber, the main body of the telescopic cover plate, and the supporting window plate are all made of elastic and bendable material.

[0012] Furthermore, elastic sealing gaskets are provided at both the top and bottom of the telescopic cover.

[0013] Furthermore, a heat-insulating plate is inserted into the interior of the cold chamber.

[0014] Furthermore, a cold air fan is fixedly installed on the top of the cover frame, and a cold source main pipe is provided at the outlet of the cold air fan. Several cold source auxiliary pipes are provided on the cold source main pipe, and several cold source connecting holes are provided on the top of the cold chamber. The cold source auxiliary pipes are connected to the cold source connecting holes.

[0015] Furthermore, a water inlet pipe is installed on the main cold source pipe, and the water inlet pipe is connected to an external water source.

[0016] Furthermore, four sets of guide wheels are rotatably mounted on the top of the cover frame, and the main cold source pipe is redirected through the guide wheels.

[0017] Furthermore, the cooling tank has a built-in refrigerator, and there are two sets of cooling tanks. The return oil main is connected to the two sets of cooling tanks through a three-way valve one, and the two sets of cooling tanks are connected to the return oil pump through a three-way valve two.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention can determine whether a fuel injection pump can reach thermal equilibrium under the most severe operating conditions. It determines whether its hot spot temperature exceeds the safety limits of materials, seals, and fuel. It assesses thermally induced performance degradation (such as decreased fuel supply at high temperatures and increased leakage), and the thermal performance testing results are excellent.

[0020] 2. This invention forms a dual-environment chamber by using a test hood and a cold chamber. The test hood simulates a high-temperature environment, the cold chamber simulates a high-speed cooling airflow, the heating surface simulates the heat radiation surface near the engine compartment, and the windward surface simulates the wind-receiving surface of the fuel injection pump during vehicle operation. The test results are closer to reality. Structurally, it achieves physical isolation and controllable interaction between a stable high-temperature environment and a transient high-speed cooling airflow, which can accurately simulate extreme transient conditions such as a car rushing into rain at high speed or alternating impacts of high and low temperature air.

[0021] 3. The present invention, through the setting of the telescopic cover plate, can simultaneously adjust the heating surface and the windward surface of the fuel injection pump according to the needs, and can be applied to the testing of different models of fuel injection pumps, with a wide testing range. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the open structure of the test cover of the present invention;

[0024] Figure 3 This is a schematic diagram of the test cover structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the cover frame structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the telescopic cover structure of the present invention. Figure 1 ;

[0027] Figure 6 This is a schematic diagram of the telescopic cover structure of the present invention. Figure 2 ;

[0028] Figure 7 This is a schematic diagram of the return oil connection pipe structure of the present invention.

[0029] Reference numerals: 1. Test bench; 2. Test drive; 3. Cooling tank; 4. Return oil pump; 5. Oil storage tank; 6. Inlet oil pump; 7. Inlet pipe; 8. Main return oil pipe; 9. Mounting base; 10. Cover frame; 101. Slide groove; 11. Return oil connection pipe; 111. Branch pipe; 112. Flow meter; 113. Temperature sensor; 114. Pressure control valve; 12. Air cooler; 13. Main cold source pipe; 131. Secondary cold source pipe; 132. Water supply pipe; 14. Guide wheel; 15. Telescopic cover plate; 151. Support slide rod; 152. Electric heating radiant plate; 16. Support window plate; 17. Cold chamber; 171. Insulation plate; 172. Cold source connecting hole. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0031] Example 1, as Figures 1-7 As shown, a performance testing platform for an engine fuel injection pump includes a test bench 1, a test drive 2 mounted on the test bench 1, a mounting base 9 mounted on the upper surface of the test bench 1, a fuel injection pump with a thermocouple attached mounted on the mounting base 9, a test cover slidably connected to the upper surface of the test bench 1, an electric heating radiation plate 152 linearly arrayed on the inner wall of the test cover, and an independent cold chamber 17 provided on the outer side of the test cover, which can communicate with the test cover.

[0032] The test bench 1 is equipped with a cooling tank 3, a return oil pump 4, an oil storage tank 5, and an inlet oil pump 6. The return oil pump 4 can transport the cooled fuel in the cooling tank 3 to the oil storage tank 5. The upper surface of the test bench 1 is equipped with an inlet pipe 7. The inlet oil pump 6 can transport the fuel in the oil storage tank 5 to the inlet pipe 7. The inner top of the test cover is equipped with a return oil connection pipe 11. The return oil connection pipe 11 is connected to the cooling tank 3 through the return oil main pipe 8. Several branch pipes 111 are provided on the return oil connection pipe 11. A flow meter 112, a temperature sensor 113, and a pressure control valve 114 are provided on the branch pipes 111.

[0033] Test Preparation: Place thermocouples at key locations such as the pump bearing housing, high-pressure area of ​​the pump head, all sealing flange faces, oil return port, and cooling channel inlet and outlet. All temperature, pressure, and flow sensors must be within their valid calibration period. Then, install the pump on mounting base 9, connect all pipelines and wiring harnesses, ensuring a seal. Connect oil inlet pipe 7 to the oil inlet end, branch pipe 111 to the oil outlet end, and connect the fuel injection pump output shaft to test drive 2.

[0034] Test steps: (1) Pre-treatment: Start the fuel system, and the fuel pump 6 delivers fuel to the fuel injection pump. The fuel injection pump runs in a low load cycle to fully preheat and degas until the fuel temperature stabilizes at the standard initial temperature (40±2°C). After reaching the initial standard temperature, control the speed of the test drive 2 and the pressure control valve 114 to make the fuel injection pump run under standard conditions for 10-15 minutes. Measure and record the cold reference data: drive torque, leakage (judged by the difference between the fuel inlet and return flow), inlet and outlet temperature difference (judged by the difference between the value detected by the temperature sensor 113 and the fuel inlet temperature), etc. Record the initial values ​​of each temperature measuring point at this time.

[0035] (2) Thermal performance test: By controlling the speed and pressure of the test drive 2 and the control valve 114, the speed and pressure of the fuel injection pump are set to the defined most stringent operating conditions. Start and run continuously, and then input fuel into the fuel injection pump at a stable flow rate through the fuel inlet pump 6. Then, fuel flows back from the return fuel connection pipe 11 and the return fuel main pipe 8 to the cooling tank 3. The flow meter 112 and the temperature sensor 113 individually detect the fuel injection in each branch pipe 111, and measure the individual fuel injection quantity and the total fuel injection quantity. The hot fuel that flows back is cooled to the initial temperature in the cooling tank 3, and then transported to the fuel storage tank 5 through the return fuel pump 4. When the temperature change rate of all key measuring points is less than 0.5°C / minute for 30 consecutive minutes, the system can be considered to have reached thermal equilibrium. Record the steady-state thermal data. After reaching thermal equilibrium, record the steady-state readings of all sensors.

[0036] Record the stable flow rate of the cooling medium and the inlet and outlet temperature difference. Determine the stable operation of the fuel injection pump under harsh operating conditions.

[0037] (3) Extreme driving environment performance test: The electrothermal radiation plate 152 of the fuel injection pump, which needs to be close to the heat source such as the engine, is opened to simulate the heat source heating the fuel injection pump during driving. Then, the cold chamber 17 is oriented towards the windward side of the fuel injection pump, and cold air is blown out of the cold chamber 17. It can run continuously for a period of time to simulate the long-term working conditions of the vehicle driving in extreme environments. It can also be intermittently connected to the test cover. The inside of the test cover simulates a high-temperature environment, and the cold chamber 17 simulates a high-speed cooling airflow. The structure realizes physical isolation and controllable interaction between the stable high-temperature environment and the transient high-speed cooling airflow, which can accurately simulate the extreme transient working conditions of the car rushing into the rain at high speed or the alternating impact of high and low temperature air. The operation of the fuel injection pump in extreme environments is judged by detecting the fuel injection quantity, fuel injection pressure and fuel injection temperature.

[0038] Example 2, based on the above examples, further includes a test cover consisting of a cover frame 10 and a telescopic cover plate 15. The cover frame 10 has a sliding window inside, and the telescopic cover plate 15 is set in the sliding window. The inner bottom and inner top of the sliding window are provided with grooves 101. Supporting slide rods 151 are provided at the fold positions on the inner side of the telescopic cover plate 15. The supporting slide rods 151 are slidably connected in the grooves 101. The electric heating radiation plate 152 is fixedly installed on the supporting slide rods 151. A supporting window plate 16 is provided in the middle of the telescopic cover plate 15. The cold chamber 17 is fixedly installed on the supporting window plate 16. The main body of the cold chamber 17, the main body of the telescopic cover plate 15, and the supporting window plate 16 are all made of elastic and bendable materials. The outer layer is made of stainless steel sheet, and the inner layer is made of aerogel felt as a heat insulation lining.

[0039] Preferably, elastic sealing gaskets are provided at both the top and bottom of the telescopic cover plate 15. The sealing performance of the test cover can be improved by providing elastic sealing gaskets.

[0040] Preferably, a heat insulation plate 171 is inserted into the interior of the cold chamber 17, and the test cover is separated from the cold chamber 17 by inserting or removing the heat insulation plate 171.

[0041] This embodiment provides a novel test cover structure that eliminates the need for multiple cold chambers 17 on the test cover. The cold chambers 17 can be pulled open like a curtain to accommodate different vehicle models. Since the actual installation positions of the fuel injection pumps vary across different vehicles, resulting in different airflow positions, the freely adjustable cold chambers 17 are better suited for various vehicles. The front or rear telescopic cover 15 can be folded, with the supporting slide rod 151 of the folded portion driving the electric heating radiation plates 152 on it to fold together. When unfolded, the electric heating radiation plates 152 on the supporting slide rod 151 are evenly spaced and positioned on the heating surface to heat the fuel injection pump. Furthermore, the heating position of the electric heating radiation plates 152 can be adjusted by changing the degree of unfolding of the telescopic cover 15, making it suitable for testing different models of fuel injection pumps.

[0042] In embodiment three, based on the above embodiments, a cold air blower 12 is fixedly installed on the top of the cover frame 10, a cold source main pipe 13 is provided at the outlet of the cold air blower 12, a plurality of cold source secondary pipes 131 are provided on the cold source main pipe 13, a plurality of cold source connecting holes 172 are provided on the top of the cold chamber 17, and the cold source secondary pipes 131 are connected to the cold source connecting holes 172.

[0043] Preferably, a water supply pipe 132 is provided on the main cold source pipe 13, and the water supply pipe 132 is connected to an external water source.

[0044] Preferably, four sets of guide wheels 14 are rotatably mounted on the top of the cover frame 10, and the cold source main pipe 13 is reversed through the guide wheels 14.

[0045] By activating the air cooler 12, low-temperature cold air is delivered into the cold chamber 17 through the main cold source pipe 13 and several auxiliary cold source pipes 131. Water can also be added during the process to mix water droplets into the low-temperature gas, simulating a rainy environment. With the guide wheels 14, the main cold source pipe 13 is guided when the cold chamber 17 moves to different positions, preventing excessive bending of the main cold source pipe 13 and making the movement more stable.

[0046] Example 4, based on the above examples, further includes a built-in cooler in the cooling tank 3, and two sets of cooling tank 3 are provided. The return oil main pipe 8 is connected to the two sets of cooling tank 3 through a three-way valve one, and the two sets of cooling tank 3 are connected to the return oil pump 4 through a three-way valve two.

[0047] By setting up two sets of cooling tanks 3, one set recovers and stores fuel, and the other set controls the temperature. After temperature control, the fuel is directly transported to the oil storage tank 5 for recycling, so that the temperature of the imported fuel remains consistent.

[0048] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A performance testing platform for an engine fuel injection pump, comprising a test bench (1), characterized in that, The test bench (1) is equipped with a test drive (2), and the upper surface of the test bench (1) is equipped with a mounting base (9). The mounting base (9) is equipped with an oil injection pump with a thermocouple attached. The upper surface of the test bench (1) is slidably connected to a test cover. The inner wall of the test cover is linearly arrayed with electrothermal radiation plates (152). The outer side of the test cover is provided with an independent cold chamber (17). The cold chamber (17) can be connected to the test cover. The test bench (1) is equipped with a cooling tank (3), a return oil pump (4), an oil storage tank (5), and an inlet oil pump (6). The return oil pump (4) can transport the cooled fuel in the cooling tank (3) to the oil storage tank (5). The upper surface of the test bench (1) is equipped with an inlet pipe (7). The inlet oil pump (6) can transport the fuel in the oil storage tank (5) to the inlet pipe (7). The top of the test cover is equipped with a return oil connection pipe (11). The return oil connection pipe (11) is connected to the cooling tank (3) through the return oil main pipe (8). Several branch pipes (111) are provided on the return oil connection pipe (11). A flow meter (112), a temperature sensor (113), and a pressure control valve (114) are provided on the branch pipes (111). The test cover consists of a cover frame (10) and a telescopic cover plate (15). The cover frame (10) has a sliding window inside, and the telescopic cover plate (15) is set in the sliding window. The bottom and top of the sliding window are provided with grooves (101). The creases on the inner side of the telescopic cover plate (15) are provided with support rods (151). The support rods (151) are slidably connected in the grooves (101). The electric heating radiation plate (152) is fixedly installed on the support rods (151). The telescopic cover plate (15) has a support window plate (16) in the middle. The cold chamber (17) is fixedly installed on the support window plate (16). The main body of the cold chamber (17), the main body of the telescopic cover plate (15), and the support window plate (16) are all made of elastic and bendable material.

2. The performance testing platform for an engine fuel injection pump according to claim 1, characterized in that, The top and bottom of the telescopic cover (15) are provided with elastic sealing gaskets.

3. The performance testing platform for an engine fuel injection pump according to claim 2, characterized in that, The interior of the cold chamber (17) is fitted with a heat-insulating plate (171).

4. The performance testing platform for an engine fuel injection pump according to claim 3, characterized in that, A cold air blower (12) is fixedly installed on the top of the cover frame (10). A cold source main pipe (13) is provided at the outlet of the cold air blower (12). Several cold source auxiliary pipes (131) are provided on the cold source main pipe (13). Several cold source connecting holes (172) are provided on the top of the cold chamber (17). The cold source auxiliary pipes (131) are connected to the cold source connecting holes (172).

5. The performance testing platform for an engine fuel injection pump according to claim 4, characterized in that, The main cold source pipe (13) is equipped with a water supply pipe (132), which is connected to an external water source.

6. The performance testing platform for an engine fuel injection pump according to claim 5, characterized in that, The top of the cover frame (10) is rotatably mounted with four sets of guide wheels (14), and the cold source main pipe (13) is reversed through the guide wheels (14).

7. The performance testing platform for an engine fuel injection pump according to claim 6, characterized in that, The cooling tank (3) has a built-in refrigerator and two sets of cooling tanks (3) are provided. The return oil main pipe (8) is connected to the two sets of cooling tanks (3) through a three-way valve one, and the two sets of cooling tanks (3) are connected to the return oil pump (4) through a three-way valve two.

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