Oil inlet pressure and oil return pressure control device for engine bench test

Abstract

The utility model relates to the field of engine bench test equipment, and discloses an oil inlet and return pressure control device for an engine bench test, which ensures the performance test accuracy of an engine under different working conditions through a system formed by an oil tank, an oil inlet and return control unit and an oil pipe. The key component comprises a pressure reducing valve used for actively controlling oil inlet pressure and preventing oil return resistance increase and engine power abnormity caused by too high pressure. The one-way valve enables return oil to be directly guided into the engine, oil return resistance is reduced, and oil supply circulation and combustion stability are guaranteed; reasonable diversion and convergence of an oil inlet and return system are achieved through the three-way design, the operation efficiency and flexibility of an oil supply system are improved, the oil inlet and return proportion can be conveniently adjusted according to test requirements, and therefore accurate and real engine performance data are obtained.

Description

Technical Field

[0001] The utility model relates to the field of engine bench test equipment, in particular to an oil inlet pressure and oil return pressure control device for an engine bench test. Background Art

[0002] In the development and industrial production of modern engine technology, engine bench testing plays a vital role, running through all aspects of engine design, optimization and improvement, and even certification. The bench test aims to comprehensively monitor and analyze the performance parameters and dynamic response characteristics of the engine under various working conditions, providing detailed data support for designers. It is also an important reference for users to evaluate the performance, economy and environmental protection attributes of engine products when purchasing them. Among them, the engine inlet and return oil pressures are the core factors affecting engine performance, combustion efficiency and pollutant emissions, and their precise control is particularly important. At present, engine bench laboratories are generally equipped with a complete oil supply system, which connects the oil tank to the engine's inlet and return oil ports through oil pipes to ensure the normal operation of the engine. However, in actual operation, due to unreasonable layout of the oil tank position or improper setting of the oil pump supply pressure, the engine inlet pressure may exceed the standard and exceed the original design parameter range. At the same time, the excessively high position of the oil tank will also increase the oil return resistance, resulting in poor oil return to the engine.

[0003] The fuel supply system directly affects the engine power performance and is more sensitive to the fuel inlet pressure, such as non-road mechanical pump diesel engines below 37kW. Excessive fuel inlet pressure will cause the power of such diesel engines to increase significantly, while excessive oil return resistance will lead to poor engine fuel supply and abnormal combustion. Therefore, it is particularly important to control the engine fuel inlet pressure and oil return pressure during engine bench tests. It is a necessary condition for obtaining reliable and effective engine performance parameters, response characteristics, combustion efficiency, pollutant emissions and other results in engine bench tests. Utility Model Content

[0004] The utility model aims to provide an oil inlet pressure and oil return pressure control device for an engine bench test, so as to control the oil inlet pressure during the test, thereby reducing the oil return resistance of the engine and improving the reliability of the test data.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an oil inlet pressure and oil return pressure control device for an engine bench test, which is used to detect the performance parameters and response characteristics of the engine under different working conditions. The engine is provided with an oil inlet and an oil return port, including an oil supply port for providing high-pressure oil, an oil inlet and return oil control unit and a plurality of oil pipes. The oil inlet and return oil control unit includes an oil inlet interface, an oil return interface and a pressure reducing valve connected by an oil pipe. The oil inlet interface is connected to the oil supply port through an oil pipe and is connected to the oil inlet of the engine. The pressure reducing valve is arranged on the oil pipe between the oil supply port and the oil inlet. A tee is connected on the oil pipe between the pressure reducing valve and the oil inlet interface, and the tee is connected to the oil return interface. A one-way valve is arranged between the oil return interface and the tee.

[0006] The beneficial effects of this solution are: 1. By setting a pressure reducing valve, the fuel pressure entering the engine is actively controlled to avoid excessive oil inlet pressure, which leads to a series of problems such as increased engine power; 2. The return oil interface is directly connected to the oil inlet interface, and a one-way valve is set to directly guide the return oil into the engine, reducing the return oil resistance and ensuring the normal oil supply cycle of the engine. At the same time, it prevents the return oil from flowing back, ensuring the stability and efficiency of the engine combustion. 3. The three-way design allows the oil inlet and return oil systems to be reasonably diverted and merged, improving the operating efficiency and flexibility of the entire oil supply system. The oil inlet and return oil ratio can be adjusted in time according to actual test needs, so as to obtain more accurate and true engine performance parameters. 4. The oil supply port provides high-pressure oil, which can effectively ensure that the engine is adequately supplied with oil and avoid engine oil absorption due to insufficient oil supply.

[0007] Furthermore, it also includes a filter, which is arranged between the oil supply port and the pressure reducing valve.

[0008] Beneficial effects: The filter can effectively intercept and remove fine particles, sediment or other impurities that may exist in the fuel tank, ensuring that the fuel entering the engine is of higher purity, preventing these impurities from entering the fuel system and causing wear or blockage to the precision components inside the engine, thereby maximizing the protection of the normal operation and service life of the engine; the fuel purified by the filter can enter the engine more smoothly, reducing problems such as poor fuel supply or reduced combustion efficiency caused by impurities, and helping to improve the overall performance of the engine; pre-filtering the fuel can significantly reduce the probability of various faults caused by fuel impurities, such as blockage of the fuel injection system, increased wear of the piston ring, accelerated oil contamination, etc., thereby indirectly improving the reliability and effectiveness of the engine bench test.

[0009] Furthermore, it also includes a flow meter, which is arranged between the filter and the pressure reducing valve.

[0010] Beneficial effects: 1. The flow meter can measure the filtered fuel flow in real time and accurately, providing researchers with intuitive data references to accurately control the fuel supply and ensure that the engine obtains the appropriate fuel supply under different operating conditions; 2. The flow meter readings can directly reflect the fuel consumption of the engine under different loads and speeds, thereby helping researchers analyze and quantify the relationship between the engine's power output and fuel flow, providing a scientific basis for optimizing engine performance and improving fuel efficiency; 3. Quickly understanding the actual fuel consumption of the engine during transient changes or steady-state operation helps to adjust the test conditions in a timely manner and optimize the test process, thereby obtaining more reliable and valuable test data.

[0011] Furthermore, it also includes a pressure gauge, which is arranged between the tee and the oil inlet interface.

[0012] Beneficial effects: 1. Through the pressure gauge, the test personnel can read and monitor the fuel pressure at the fuel inlet in real time and intuitively, and timely grasp the changes in the fuel inlet pressure of the engine under different working conditions, ensuring that the fuel inlet pressure is always within the ideal range; 2. The fuel inlet pressure data displayed by the pressure gauge provides an accurate reference basis for the operator. According to the test requirements and engine working conditions, the set value of the pressure reducing valve can be adjusted in a timely and accurate manner to ensure the stability and precise control of the engine fuel inlet pressure; 3. By real-time monitoring of the fuel inlet pressure, it can effectively avoid problems such as engine performance degradation, accelerated wear of parts, and reduced fuel efficiency caused by excessively high or low fuel inlet pressure, thereby effectively preventing the occurrence of related faults and extending the service life of the engine; 4. With the assistance of the pressure gauge, the engine fuel supply system can be debugged and optimized quickly and accurately, which greatly improves the accuracy and efficiency of the engine bench test, and provides more accurate and effective data support for engine research and development, improvement and performance verification.

[0013] Further, when the return oil pressure is greater than the sum of the set pressure of the pressure reducing valve and the pressure of the one-way valve, the one-way valve is opened, and the return oil interface is connected to the oil inlet interface.

[0014] Beneficial effect: When the return oil pressure, that is, the pressure at the engine's oil return port, is greater than the sum of the pressure of the pressure reducing valve set pressure and the pressure of the one-way valve, the one-way valve is pushed open, and the return oil directly returns to the oil inlet interface through the tee, and then returns to the engine through the oil inlet interface to be used again by the engine, thereby reducing the movement path of the return oil. The timely and appropriate re-injection of the return oil helps to maintain the continuity and stability of the fuel supply when the engine is working, thereby improving the combustion efficiency, especially under certain special working conditions, such as sudden changes in load.

[0015] Furthermore, the engine is a diesel engine.

[0016] Beneficial effects: Compared with gasoline engines, diesel engines have greater torque and are more sensitive to changes in the oil inlet pressure and return oil pressure in the fuel supply system. At the same time, diesel vehicles do not require an ignition system, have a relatively low failure rate, and have better fuel economy and lower testing costs.

[0017] Furthermore, it also includes an oil tank and a booster pump, and the oil tank is connected to the oil supply port through the booster pump.

[0018] Beneficial effects: The fuel pressure in the fuel tank is increased by a booster pump, the structure is simple and the maintenance cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0020] The following is further described in detail through specific implementation methods:

[0021] The reference numerals in the drawings of the specification include: oil tank 1, oil supply port 11, filter 21, flow meter 22, pressure reducing valve 23, tee 24, pressure gauge 25, engine 26, oil inlet interface 261, oil return interface 262, check valve 27, oil pipe 3.

[0022] Example

[0023] The embodiment is basically as shown in the attached Figure 1 As shown, Figure 1 The oil inlet pressure and oil return pressure control device of an engine bench test is used to detect the performance parameters and response characteristics of the engine 26 under different working conditions, such as Figure 1 As shown, the oil inlet and return control unit includes an oil tank 1 and a plurality of oil pipes 3. The oil inlet and return control unit includes the oil pipes 3 as shown in FIG. Figure 1 The connected filter 21, flow meter 22, pressure reducing valve 23, tee 24, pressure gauge 25, oil inlet interface 261, check valve 27 and oil return interface 262, the engine includes an oil inlet and an oil return port, the oil inlet interface 261 is connected to the oil inlet, and the oil return interface 262 is connected to the oil return port, the fuel tank 1 includes a fuel supply port 11, the fuel tank 1 is filled with diesel, a boost pump is arranged between the fuel tank 1 and the fuel supply port 11, so as to increase the pressure of the diesel at the fuel supply port 11 to avoid insufficient diesel pressure in the fuel tank 1, the diesel is pressurized by the boost pump and flows out through the fuel supply port 11, the fuel supply port 11 is connected to the filter 21, the engine 26 is preferably a non-road mechanical pump diesel engine below 37kW with an oil inlet and an oil return port, the oil inlet is connected to the oil inlet interface, and the oil return port is connected to the oil return interface.

[0024] The specific implementation process is as follows:

[0025] First, the oil return control unit is connected through the oil pipe 3. Figure 1As shown, the filter 21 is connected with the fuel tank 1 in turn, the fuel inlet of the engine 26 is connected with the fuel inlet interface 261, and the return oil port is connected with the return oil interface 262. Subsequently, the diesel in the fuel tank 1 is pressurized by the boost pump and flows into the return oil control unit through the fuel supply port 11, and is filtered by the filter 21 and enters the flow meter 22 and the pressure reducing valve 23, so that the diesel flow entering the pressure reducing valve 23 is observed through the flow meter 22, and the diesel enters the engine 26 after being reduced in pressure by the pressure reducing valve 23. Since a pressure gauge 25 is connected in series between the engine 26 and the pressure reducing valve 23, the operator can check the oil inlet pressure in real time through the pressure gauge 25, thereby adjusting the set pressure of the pressure reducing valve 23, and counting the fuel consumption through the flow meter 22. The incompletely burned diesel reaches the one-way valve through the return oil port. When the pressure of the return oil port is greater than the sum of the set pressure of the pressure reducing valve 23 and the pressure of the one-way valve, the one-way valve is pushed open, the return oil interface is connected with the oil inlet interface, and the return oil enters the oil inlet interface 261 through the three-way joint, enters the engine, and is reused by the engine.

[0026] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that the technical means for solving the problems in the above-mentioned embodiments of the utility model can be used in combination to solve multiple technical problems at the same time. For those skilled in the art, several deformations and improvements can be made without departing from the technical solution of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An oil inlet pressure and oil return pressure control device for an engine bench test, used to detect the performance parameters and response characteristics of the engine under different working conditions, the engine is provided with an oil inlet and an oil return port, characterized in that: It includes an oil supply port for providing high-pressure oil, an oil inlet and return control unit and a plurality of oil pipes. The oil inlet and return control unit includes an oil inlet interface, an oil return interface and a pressure reducing valve connected by an oil pipe. The oil inlet interface is connected to the oil supply port through an oil pipe and is connected to the oil inlet of the engine. The pressure reducing valve is arranged on the oil pipe between the oil supply port and the oil inlet. A tee is connected on the oil pipe between the pressure reducing valve and the oil inlet interface. The tee is connected to the oil return interface. A one-way valve is arranged between the oil return interface and the tee.

2. The oil inlet pressure and oil return pressure control device for engine bench test according to claim 1, characterized in that: The utility model also comprises a filter, which is arranged between the oil supply port and the pressure reducing valve.

3. The oil inlet pressure and oil return pressure control device for engine bench test according to claim 2, characterized in that: The device also includes a flow meter, which is arranged between the filter and the pressure reducing valve.

4. The oil inlet pressure and oil return pressure control device for engine bench test according to claim 3, characterized in that: It also includes a pressure gauge, which is arranged between the tee and the oil inlet interface.

5. The oil inlet pressure and oil return pressure control device for engine bench test according to claim 1, characterized in that: When the return oil pressure is greater than the sum of the set pressure of the pressure reducing valve and the pressure of the one-way valve, the one-way valve is pushed open and the return oil interface is connected to the oil inlet interface.

6. The oil inlet pressure and oil return pressure control device for engine bench test according to claim 1, characterized in that: The engine is a diesel engine.

7. The oil inlet pressure and oil return pressure control device for engine bench test according to claim 1, characterized in that: It also includes an oil tank and a booster pump, and the oil tank is connected to the oil supply port through the booster pump.

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