An internal combustion engine gearbox oil pump performance test system

Abstract

The present invention provides a performance test system for an internal combustion engine gearbox oil pump, which belongs to the technical field of automobile engine parts performance test. It comprises: a tested oil pump and a control device, the tested oil pump is respectively connected to the control device, the drive motor and the torque speed measuring instrument, the oil outlet of the tested oil pump is connected to the oil outlet pipeline, the oil outlet pipeline is connected to the first pressure transmitter, the oil outlet pipeline is branched into two sub-pipelines, the two sub-pipelines are respectively connected to the main oil tank, the first regulating valve and the mass flow meter are respectively arranged on the two sub-pipelines from the oil outlet direction, the oil inlet of the tested oil pump is connected to the oil inlet pipeline, the oil inlet pipeline is respectively connected to the valve, the second pressure transmitter and the temperature transmitter, the main oil tank is connected to the auxiliary oil tank, and the oil inlet pipeline between the main oil tank and the auxiliary oil tank is connected to the first oil filter and the circulating pump. The system of the present invention is used to improve the test efficiency and save fuel consumption.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile engine component performance testing, and in particular relates to an internal combustion engine gearbox oil pump performance testing system. Background Art

[0002] Before leaving the factory, the internal combustion engine oil pump products must be fully inspected for product quality and performance to determine whether the products comply with JB / T 8413.2-2010 and relevant product enterprise standards. "Internal combustion engine oil pump part 2 assembly test method" JB / T 8413.2-2010 stipulates the assembly performance test device for gear pumps and rotor pumps and other positive displacement oil pumps for internal combustion engines. After long-term testing practice, it was found that the test device has at least one of the following deficiencies:

[0003] (1) The oil outlet pipeline in the test device is a single pipeline, which cannot take into account the accurate measurement of large flow (100L / min) and small flow (2L / min);

[0004] (2) In the test device, there is only an oil suction filter on the inlet pipeline of the oil pump under test. The oil change frequency is basically 3 months / 5000 pieces. The test oil cost is high and the utilization rate is low;

[0005] (3) There is no oil temperature balancing device in the test device, and the temperature is controlled at ±2°C, which is not very accurate;

[0006] (4) The oil pump in the test device is clamped manually, which takes at least 4 minutes per piece and is inefficient.

[0007] In the prior art, patent application document CN102297123A discloses an oil pump test bench, which is used to test the assembly performance of gear pumps and rotor pumps for internal combustion engines and other volumetric oil pumps. It includes a drive motor, a torque-speed measuring instrument, a thermometer, a pressure gauge, a regulating valve, a reversing valve, a gear flowmeter, an oil tank, a heating thermostat, a relief valve, a vacuum pressure gauge and an oil suction filter; the invention also includes a transparent flowmeter, which is connected in series to the oil outlet pipe at the rear side of the pressure gauge and the front side of the regulating valve and the relief valve. The technical solution of the invention is to add a transparent flowmeter to the test device structure disclosed in JB / T8413.2-2010, which is connected in series to the oil outlet pipe at the rear side of the pressure gauge and the front side of the regulating valve and the relief valve, so as to intuitively see whether the tested oil pump is leaking, and the flow rate can be directly read without complicated calculations.

[0008] For another example, patent application document CN104500381A discloses an oil pump performance test device: it includes a workbench, an oil tank, a control module and a data display module, the oil tank is connected to the oil suction port of the oil pump to be tested, the oil outlet of the oil pump to be tested is connected to an oil drain pipe, the outlet end of the oil drain pipe is connected to the main oil pipe and the return oil pipe, and the outlets of the main oil pipe and the return oil pipe are both connected to the oil tank; the oil drain pipe is connected to a flow sensor, a first pressure sensor and a first pressure regulating valve in sequence along the oil discharge direction, the main oil pipe is connected to a second pressure sensor, and the return oil pipe is connected to a second pressure regulating valve. The oil pump performance test device simulates the relationship between the outlet pressure and flow of the oil pump at different temperatures at the same temperature, and the test time is short and the test efficiency is high.

[0009] For another example, patent application document CN111594431A discloses an oil pump test bench having a driving motor connected to the tested oil pump; the oil inlet of the tested oil pump is connected to an oil suction pipe immersed in the oil in the oil tank, and a vacuum pressure gauge is installed on the oil suction pipe; the tested oil pump rotates under the drive of the driving motor; the oil outlet of the tested oil pump is connected to a volume flow meter and a solenoid valve respectively through an oil outlet pipe, and a pressure gauge and a thermometer are installed on the oil outlet pipe; the volume flow meter is connected to an overpressure regulating valve; the volume flow meter is provided with a bypass, a three-way ball valve is provided in front of the volume flow meter, and a one-way valve is provided after the volume flow meter; the solenoid valve is connected to a negative pressure regulating valve through an oil pipe, and a stop valve is connected before and after this route; the negative pressure regulating valve and the overpressure regulating valve are connected to the oil filter together, and the oil filter enters the oil tank through the oil cooler. This invention solves the test requirements of how to conveniently and accurately adjust the pump output pressure and simulate pressure fluctuations.

[0010] The above technical solutions are generally used to solve the flow metering and pressure measurement of oil pumps, etc., and cannot effectively solve one or more of the above-mentioned deficiencies. In view of this, the present invention is proposed. Summary of the invention

[0011] The technical problem to be solved by the present invention is to provide a performance testing system for an internal combustion engine gearbox oil pump in view of the deficiencies in the prior art.

[0012] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0013] A performance test system for an internal combustion engine gearbox oil pump comprises: a tested oil pump and a control device, wherein the tested oil pump is connected to the control device, a drive motor and a torque and speed measuring instrument respectively, an oil outlet of the tested oil pump is connected to an oil outlet pipeline, the oil outlet pipeline is connected to a first pressure transmitter, the oil outlet pipeline is branched into two sub-pipelines, the two sub-pipelines are respectively connected to a main oil tank, a first regulating valve and a mass flow meter are respectively arranged on the two sub-pipelines from the oil outlet direction, an oil inlet of the tested oil pump is connected to an oil inlet pipeline, the oil inlet pipeline is respectively connected to a valve, a second pressure transmitter and a temperature transmitter, the main oil tank is connected to a subsidiary oil tank, a first oil filter and a circulating pump are connected to the oil inlet pipeline between the main oil tank and the subsidiary oil tank, and the drive motor, the torque and speed measuring instrument, the first pressure transmitter, the first regulating valve, the mass flow meter, the valve, the second pressure transmitter, the temperature transmitter, the first oil filter and the circulating pump are respectively connected to the control device.

[0014] Preferably, the two sub-pipelines include an oil outlet pipeline with a diameter of DN20 and an oil outlet pipeline with a diameter of DN10, and the corresponding flow measurement ranges are 6L / min to 100L / min and 0.1L / min to 30L / min, respectively.

[0015] Among them, each sub-pipeline uses a mass flow meter with a flow detection accuracy of ±0.2%, which takes into account the accurate measurement of large flow (100L / min) and small flow (2L / min).

[0016] The mass flow meter is automatically selected by the control device according to the flow rate, or manually selected by the operator on the display page.

[0017] The mass flow meter measures the flow data of the corresponding sub-pipeline and transmits the flow data to the control device. The control device compares the measured flow data with the preset flow value. When the absolute value of the difference between the two is greater than 0.2%, the valve opening of the first regulating valve is adjusted to change the flow of the corresponding sub-pipeline, thereby realizing the control of the oil supply of the tested oil pump.

[0018] The mass flow meter is used in conjunction with a stainless steel high-pressure and high-temperature pneumatic ball valve.

[0019] Preferably, the drive motor drives the front end drive shaft via a synchronous belt, the front end drive shaft drives the main shaft, the main shaft drives the tested oil pump via an elastic connecting piece, the tested oil pump is installed in a horizontal manner with the main shaft, the front end drive shaft and the main shaft are both installed on a bearing seat, the torque and speed measuring instrument is installed horizontally and coaxially between the two bearing seats, and the bearing seat has an oil circuit lubrication system.

[0020] Preferably, the torque and speed measuring instrument is communicatively connected to the control device via a signal line, the drive motor is connected to a frequency converter, and the frequency converter is connected to the control device.

[0021] The torque speed measuring instrument measures the speed of the tested oil pump and transmits the measured speed data to the control device. The control device receives the speed data. When the absolute value of the difference between the measured speed value and the preset speed value is greater than 2rpm, the control device changes the speed of the drive motor through the frequency converter. The drive motor drives the tested oil pump to achieve measurement and control of the speed of the tested oil pump.

[0022] Preferably, the first pressure transmitter measures the pressure at the oil outlet of the tested oil pump and transmits the measured pressure value to the control device, which compares the measured pressure value with a preset pressure value, and controls the valve position sensor and valve motor connected to the first regulating valve based on the difference between the two to change the valve opening of the first regulating valve, thereby achieving measurement and control of the pressure of the tested oil pump.

[0023] Preferably, a liquid level sensor is provided in the main oil tank, and the liquid level sensor is connected to the control device.

[0024] Preferably, the liquid level sensor measures the oil level in the main oil tank and transmits the oil level value to the control device, which compares the measured oil level value with a preset height value. When the measured oil level is lower than the preset height value, the circulation pump is turned on to allow the oil to enter the main oil tank through the auxiliary oil tank and the first oil filter. When the measured oil level reaches the preset height value, the circulation pump is turned off to achieve measurement and control of the oil level.

[0025] Preferably, a heater, a first temperature sensor and a second temperature sensor are arranged in the main oil tank, and the heater, the first temperature sensor and the second temperature sensor are respectively connected to the control device.

[0026] Preferably, the first temperature sensor and the second temperature sensor respectively measure the oil temperature in the main oil tank, and transmit the oil temperature data to the control device respectively. The control device compares the two sets of oil temperature data received. When the difference between the two sets of oil temperature data is higher than the preset difference, an early warning prompt is issued to the user to achieve an early warning of oil temperature out of control.

[0027] Preferably, the first temperature sensor or the second temperature sensor measures the oil temperature in the main oil tank and transmits the oil temperature data to the control device, which compares the received oil temperature data. When the measured oil temperature data is lower than the preset oil temperature value, the heater is started to heat the oil in the main oil tank; when the measured oil temperature data is not lower than the preset oil temperature value, the heater is turned off to achieve measurement and control of the oil temperature.

[0028] Preferably, the tested oil pump is connected to the hydraulic station via a hydraulic pipeline, and a second oil filter, an oil pump motor, a second regulating valve and a clamping cylinder are sequentially arranged on the hydraulic pipeline, the clamping cylinder is connected to the tested oil pump, and the second oil filter, the oil pump motor, the second regulating valve and the clamping cylinder are respectively connected to the control device.

[0029] Preferably, the clamping cylinder comprises a first clamping cylinder and a second clamping cylinder, and the first clamping cylinder is connected in parallel with the second clamping cylinder.

[0030] The oil pump is an important part of the lubrication system of the internal combustion engine. Its function is to increase the oil pressure and ensure a certain oil pressure, and continuously force the oil to be supplied to each friction surface, so that the internal combustion engine can be reliably lubricated, thereby reducing the friction and wear of the parts. "If the amount of lubricating oil supplied is insufficient, then the most carefully designed structure, the best bearing material, the most sophisticated processing technology, the most suitable matching and the highest quality oil will still not work. The key to the safe operation of the bearing is the viscosity and quantity of the lubricating medium."

[0031] The oil pump working characteristics can be expressed as , where Q is the oil supply, n is the speed, T is the oil temperature, p s is the pump outlet pressure. Since the pump outlet pressure p s >>Suction pressure p i , available p s Instead of full pressure △p, it is measured through speed characteristics, pressure characteristics, oil temperature characteristics and general characteristics tests. Among them, the general characteristics test combines the results of speed characteristics, pressure characteristics and oil temperature characteristics tests, and can obtain the performance of the oil pump within the allowable operating speed and pump pressure range at the specified test oil temperature. Specifically, the general characteristics test measures and records the relevant parameters such as oil supply, pump pressure, oil temperature and speed under various working conditions under variable speed, variable load and variable oil temperature conditions.

[0032] Professional testing equipment is required to detect the performance of the oil pump. At present, the performance test of the internal combustion engine transmission oil pump is mainly designed and manufactured according to the standard. "Internal Combustion Engine Oil Pump Part 2 Assembly Test Method" JB / T 8413.2-2010 stipulates the test items, test conditions, test equipment and parameter measurement, performance test specifications and test results of the external involute gear pump and internal cycloid gear pump commonly used in internal combustion engine oil pumps and other volumetric oil pumps; This part is applicable to the performance test of gear pumps and rotor pumps and other volumetric oil pump assemblies for internal combustion engines. The test device specified in this standard consists of a drive motor, a torque-speed measuring instrument, a thermometer, a pressure gauge, a regulating valve, a reversing valve, a flow meter, an oil tank, a thermostat, a relief valve, a vacuum pressure gauge and an oil suction filter. Its working principle is as follows: the oil pump under test is installed on the test seat and rotates under the drive of the drive motor, and the speed is read by the torque-speed measuring instrument. During the rotation of the oil pump under test, a local vacuum is formed due to the increase in the sealed volume to generate negative pressure, and the oil enters the oil pump under test through the oil suction filter to achieve oil suction, and the vacuum pressure gauge reads the oil inlet pressure. The temperature and pressure of the oil outlet of the oil pump under test are read by the thermometer and the pressure gauge. The oil outlet is adjusted by the regulating valve to adjust the flow rate, and the flow meter is connected through the reversing valve. The reading of the flow meter can be used to calculate and judge whether the oil pump flow rate is qualified; the relief valve plays a role of overflow and pressure stabilization; the constant temperature of the oil in the oil tank is guaranteed by the thermostat, and the thermometer is used to measure the temperature of the oil. In general, the oil outlet pipeline of the above-mentioned test device is a single pipeline, usually with a diameter of DN20, which cannot take into account the accurate measurement of large and small flows; there is only an oil suction filter on the inlet pipeline of the oil pump under test, the oil change frequency is high, the test oil cost is high, and the utilization rate is low; the temperature of the constant temperature device is controlled at ±2℃, and the accuracy is not high; the oil pump is clamped manually, which is inefficient.

[0033] Since the test requires to be able to simulate the actual situation approximately, and there are many measured parameters and required functions, it is very necessary to build a comprehensive performance test bench as a comprehensive inspection before leaving the factory to improve the one-time pass rate of products leaving the factory. It is hoped that through the design of the oil pump performance test system and the use of the test system to detect the performance, the design can be optimized, the efficiency can be improved, energy can be saved and consumption can be reduced, and the efficient operation of the vehicle can be ensured, while reducing costs and achieving the purpose of safety and reliability.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] Based on the above technical solution, the present invention provides an internal combustion engine gearbox oil pump performance test system, wherein the tested oil pump is respectively connected to a control device, a drive motor and a torque speed measuring instrument, and the drive motor and the torque speed measuring instrument are connected to the control device to form a transmission control part; the oil outlet of the tested oil pump is connected to an oil outlet pipeline, the oil outlet pipeline is connected to a first pressure transmitter, the oil outlet pipeline is branched into two sub-pipelines, the two sub-pipelines are respectively connected to a main oil tank, a first regulating valve and a mass flow meter are respectively arranged on the two sub-pipelines in order from the oil outlet direction, and the oil inlet of the tested oil pump is connected to The oil inlet pipeline is connected to the valve, the second pressure transmitter and the temperature transmitter respectively. The main oil tank is connected to the auxiliary oil tank. The oil inlet pipeline between the main oil tank and the auxiliary oil tank is connected to the first oil filter and the circulating pump. The first pressure transmitter, the first regulating valve, the mass flow meter, the valve, the second pressure transmitter, the temperature transmitter, the first oil filter and the circulating pump are respectively connected to the control device to form a measurement and control part. The above parts are interrelated and interact with each other to coordinate and complete the performance test of the tested oil pump and the control and measurement of the speed, torque, flow, oil temperature, pressure and liquid level.

[0036] The oil outlet pipeline in the system of the present invention is a double pipeline, including an oil outlet pipeline with a diameter of DN20, a measurement range of 6L / min to 100L / min, and an oil outlet pipeline with a diameter of DN10, a measurement range of 0.1L / min to 30L / min. The two pipelines each use a mass flow meter with a flow detection accuracy of ±0.2%, taking into account the accurate measurement of large flow (100L / min) and small flow (2L / min).

[0037] The system of the present invention comprises a main oil tank and a subsidiary oil tank, the main oil tank is connected to the subsidiary oil tank, the oil inlet pipeline between the main oil tank and the subsidiary oil tank is connected to the first oil filter and the circulation pump, a liquid level sensor is arranged in the main oil tank, the liquid level sensor measures the oil level in the main oil tank, and transmits the oil level value to the control device, the control device compares the measured oil level value with the preset height value, when the measured oil level is lower than the preset height value, the circulation pump is turned on, so that the oil enters the main oil tank through the subsidiary oil tank and the first oil filter, when the measured oil level reaches the preset height value, the circulation pump is turned off, and the oil level is measured and controlled. In this way, the oil is filtered when it enters the main oil tank, and the oil quality of the whole system is guaranteed. The first oil filter selects a high-precision filter, the filter element is easy to clean and replace, the filter pressure loss is less than 10kPa, the filtration accuracy is 20ηm, the system oil change frequency is 12 months or 20,000 pieces are tested, and the utilization rate of the test oil is significantly improved.

[0038] In the system of the present invention, a heater, a first temperature sensor and a second temperature sensor are arranged in the main oil tank. On the one hand, the first temperature sensor and the second temperature sensor respectively measure the oil temperature in the main oil tank, and transmit the oil temperature data to the control device respectively. The control device compares the two sets of oil temperature data received. When the difference between the two sets of oil temperature data is higher than the preset difference, an early warning prompt is issued to the user to realize the early warning of oil temperature out of control; on the other hand, the first temperature sensor or the second temperature sensor measures the oil temperature in the main oil tank, and transmits the oil temperature data to the control device. The control device compares the received oil temperature data. When the measured oil temperature data is lower than the preset oil temperature value, the heater is started to heat the oil in the main oil tank; when the measured oil temperature data is not lower than the preset oil temperature value, the heater is turned off to realize the measurement and control of the oil temperature; based on the coordinated operation of the above components, the constant oil temperature of the oil pump inlet is guaranteed, and the temperature can be controlled at ±0.5°C, which significantly improves the temperature control accuracy.

[0039] The system of the present invention further adds a hydraulic system, which includes a hydraulic station, a second oil filter, an oil pump motor, a second regulating valve and a clamping cylinder. The above components are connected in sequence. The hydraulic station synchronously drives the clamping cylinder through the oil pump motor to ensure the installation of the tested oil pump, so that the installation time is shortened to about 1.5 minutes per piece, which significantly improves the installation efficiency and saves labor and time.

[0040] The internal combustion engine gearbox oil pump performance test system proposed by the present invention is easy to manufacture. Since it was put into operation, a large number of tests have been carried out with good results. The oil pump test efficiency is less than 3 minutes / piece, the oil change frequency is about 1 year or the test volume is 20,000 pieces, and the temperature balance is ±0.5℃. The test results show that the system runs stably, the data is reliable, and the operation is convenient. It provides convenience for the quality inspection of the oil pump, and the level of oil pump performance testing has been further improved, laying a good foundation for the company's oil pump products to further open up the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0042] Figure 1 : A structural schematic diagram of an internal combustion engine gearbox oil pump performance test system of the present invention;

[0043] Among them, 1-drive motor, 2-torque speed measuring instrument, 3-clamping cylinder, 4-tested oil pump, 5-first pressure transmitter, 6, 8-first regulating valve, 7, 9-mass flow meter, 10-main oil tank, 11-first oil filter, 12-circulating pump, 13-auxiliary oil tank, 14-hydraulic station, 15-second oil filter, 16-oil pump motor, 17-second regulating valve, 18-temperature transmitter, 19-second pressure transmitter, 20-valve. DETAILED DESCRIPTION

[0044] In order to better understand the present invention, the content of the present invention is further clearly set forth in conjunction with the embodiments below, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are provided in order to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0045] Unless otherwise specifically stated, the relative arrangement of the components and steps, numerical expressions and numerical values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and devices known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and devices should be considered as part of the authorized specification.

[0046] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0047] It should be noted that the use of terms such as "first" and "second" to limit components is only to facilitate the distinction between corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0048] like Figure 1As shown, a performance test system for an internal combustion engine gearbox oil pump comprises: a tested oil pump 4 and a control device, the tested oil pump 4 is connected to the control device, a drive motor 1 and a torque speed measuring instrument 2 respectively, the oil outlet of the tested oil pump 4 is connected to an oil outlet pipeline, the oil outlet pipeline is connected to a first pressure transmitter 5, the oil outlet pipeline is branched into two sub-pipelines, the two sub-pipelines are respectively connected to a main oil tank 10, first regulating valves 6, 8 and mass flow meters 7, 9 are respectively arranged on the two sub-pipelines in order from the oil outlet direction, the oil inlet of the tested oil pump 4 is connected to an inlet The oil pipeline, the oil inlet pipeline is respectively connected to the valve 20, the second pressure transmitter 19 and the temperature transmitter 18, the main oil tank 10 is connected to the auxiliary oil tank 13, the oil inlet pipeline between the main oil tank 10 and the auxiliary oil tank 13 is connected to the first oil filter 11 and the circulating pump 12, the drive motor 1, the torque speed measuring instrument 2, the first pressure transmitter 5, the first regulating valve 6, 8, the mass flow meter 7, 9, the valve 20, the second pressure transmitter 19, the temperature transmitter 18, the first oil filter 11 and the circulating pump 12 are respectively connected to the control device.

[0049] The two sub-pipelines include an oil outlet pipeline with a diameter of DN20 and an oil outlet pipeline with a diameter of DN10, and the corresponding flow measurement ranges are 6L / min to 100L / min and 0.1L / min to 30L / min respectively.

[0050] The two sub-pipelines use a mass flow meter 7 and 9 respectively, with a flow detection accuracy of ±0.2%, which takes into account the accurate measurement of large flow (100L / min) and small flow (2L / min).

[0051] The mass flow meters 7, 9 are automatically selected by the control device according to the flow rate, or are manually selected by the operator on the display page.

[0052] The mass flow meters 7, 9 measure the flow data of the corresponding sub-pipelines and transmit the flow data to the control device, which compares the measured flow data with the preset flow value. When the absolute value of the difference between the two is greater than 0.2%, the opening of the valve 20 of the first regulating valve 6, 8 is adjusted to change the flow of the corresponding sub-pipelines, thereby realizing the control of the oil supply of the tested oil pump 4.

[0053] For mass flow meters 7 and 9, stainless steel high-pressure and high-temperature pneumatic ball valves are used.

[0054] In some specific embodiments of the present invention, the driving motor 1 drives the front end driving shaft via a synchronous belt, the front end driving shaft drives the main shaft, the main shaft drives the tested oil pump 4 via an elastic connecting piece, the tested oil pump 4 is installed in a horizontal manner with the main shaft, the front end driving shaft and the main shaft are both installed on the bearing seat, the torque and speed measuring instrument 2 is horizontally coaxially installed between the two bearing seats, and the bearing seat has an oil circuit lubrication system to ensure bearing lubrication and prevent the bearing seat and bearing from overheating.

[0055] In some specific embodiments of the present invention, the torque and speed measuring instrument 2 is communicatively connected to the control device via a signal line, the drive motor 1 is connected to the frequency converter, and the frequency converter is connected to the control device.

[0056] The torque speed measuring instrument 2 measures the speed of the tested oil pump 4, and transmits the measured speed data to the control device. The control device receives the speed data. When the absolute value of the difference between the measured speed value and the preset speed value is greater than 2rpm, the control device changes the speed of the drive motor 1 through the frequency converter. The drive motor 1 drives the tested oil pump 4, thereby realizing the measurement and control of the speed of the tested oil pump 4.

[0057] Based on this, the oil pump speed is controlled in a closed loop as follows: torque speed measuring instrument 2 → control device (asynchronous communication) → frequency converter → drive motor 1 → torque speed measuring instrument 2, with a control accuracy of ±2rpm.

[0058] Among them, the frequency converter selects Fuji digital frequency converter.

[0059] The control mode can be switched between automatic and manual; the rotation direction can be switched between clockwise and counterclockwise in the non-operating state.

[0060] The torque is directly measured by a torque-speed meter 2 .

[0061] In some specific embodiments of the present invention, the first pressure transmitter 5 measures the pressure at the oil outlet of the tested oil pump 4, and transmits the measured pressure value to the control device, which compares the measured pressure value with the preset pressure value, and controls the valve 20 position sensor and the valve 20 motor connected to the first regulating valve 6, 8 according to the difference between the two, so as to change the valve 20 opening of the first regulating valve 6, 8, thereby realizing the measurement and control of the pressure of the tested oil pump 4.

[0062] Among them, the first regulating valve 6, 8 is an electric regulating valve, and a pneumatic stop valve is installed behind each electric regulating valve. During the test, the control device automatically controls the oil circuit electric regulating valve in an orderly manner according to the pressure setting value and the oil outlet pressure detection value to complete the accurate adjustment of the oil outlet pressure. In order to ensure the accurate control of the oil pressure, the diameter of the single valve 20 is all 8mm (maximum flow capacity 510L / min). The control principle is: first pressure transmitter 5 → valve 20 position sensor → control device → valve 20 motor → valve 20 opening. There are two control methods in the program: (1) manual control: the operator drags the valve 20 setter on the display with the mouse or directly enters the valve 20 setting opening; the system will automatically control the electric forward and reverse operation according to the setting requirements of the valve 20, and the opening of the valve 20 reaches the setting requirements; (2) automatic mode: the control device automatically controls the electric forward and reverse operation of the valve 20 according to the difference between the set pressure and the measured pressure, so that the valve 20 opening changes to achieve the pressure adjustment.

[0063] In some specific embodiments of the present invention, a liquid level sensor is provided in the main oil tank 10, and the liquid level sensor is connected to the control device.

[0064] In some specific embodiments of the present invention, the liquid level sensor measures the oil level in the main oil tank 10 and transmits the oil level value to the control device, which compares the measured oil level value with a preset height value. When the measured oil level is lower than the preset height value, the circulation pump 12 is turned on to allow the oil to enter the main oil tank 10 through the auxiliary oil tank 13 and the first oil filter 11. When the measured oil level reaches the preset height value, the circulation pump 12 is turned off to achieve measurement and control of the oil level.

[0065] The oil level in the oil tank is measured by a liquid level sensor. According to the measurement status, the control device automatically and accurately controls the oil level. The total volume of the main oil tank 10 is 50L. The oil suction port and the oil return port are relatively isolated.

[0066] In some specific embodiments of the present invention, a heater, a first temperature sensor and a second temperature sensor are arranged in the main oil tank 10, and the heater, the first temperature sensor and the second temperature sensor are respectively connected to the control device.

[0067] In some specific embodiments of the present invention, the first temperature sensor and the second temperature sensor respectively measure the oil temperature in the main oil tank 10, and transmit the oil temperature data to the control device respectively. The control device compares the two sets of oil temperature data received. When the difference between the two sets of oil temperature data is higher than the preset difference, an early warning prompt is issued to the user to achieve an early warning of oil temperature out of control.

[0068] In some specific embodiments of the present invention, the first temperature sensor or the second temperature sensor measures the oil temperature in the main oil tank 10 and transmits the oil temperature data to the control device. The control device compares the received oil temperature data. When the measured oil temperature data is lower than the preset oil temperature value, the heater is started to heat the oil in the main oil tank 10; when the measured oil temperature data is not lower than the preset oil temperature value, the heater is turned off to achieve measurement and control of the oil temperature.

[0069] The main oil tank 10 is equipped with a built-in heater and two temperature sensors to prevent the temperature from getting out of control, control the oil tank temperature, and ensure that the inlet oil temperature is constant.

[0070] The main oil tank 10 and the auxiliary oil tank 13 are of sandwich structure, with a glass fiber insulation layer in the middle.

[0071] In some specific embodiments of the present invention, the tested oil pump 4 is connected to the hydraulic station 14 through a hydraulic pipeline, and the second oil filter 15, the oil pump motor 16, the second regulating valve 17 and the clamping cylinder 3 are sequentially arranged on the hydraulic pipeline, the clamping cylinder 3 is connected to the tested oil pump 4, and the second oil filter 15, the oil pump motor 16, the second regulating valve 17 and the clamping cylinder 3 are respectively connected to the control device.

[0072] The pressing cylinder 3 includes a first pressing cylinder 3 and a second pressing cylinder 3 , and the first pressing cylinder 3 and the second pressing cylinder 3 are connected in parallel.

[0073] In some specific embodiments of the present invention, both the first oil filter 11 and the second oil filter 15 are high-precision filters with a pressure loss of less than 10 kPa and a filtration accuracy of 20 μm.

[0074] The control device in the present invention includes a PLC editable controller, which is connected to a drive motor 1, a torque and speed measuring instrument 2, a first pressure transmitter 5, a first regulating valve 6, 8, a mass flow meter 7, 9, a valve 20, a second pressure transmitter 19, a temperature transmitter 18, a first oil filter 11, a circulating pump 12, a liquid level sensor, a heater, a first temperature sensor and a second temperature sensor respectively, and automatically completes the oil pump performance test and the control and measurement of the speed, torque, flow, oil temperature, pressure and liquid level.

[0075] Next, the main test indicators of the test system of the present invention and the test device disclosed in JB / T 8413.2-2010 are compared, as shown in the following table:

[0076]

[0077] From the above comparison results, it can be seen that the test system of the present invention can not only improve the test efficiency but also significantly save fuel consumption when testing a large number of oil pumps, and has higher temperature balance accuracy, and has significant promotion and application value.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. An internal combustion engine gearbox oil pump performance test system, comprising: A tested oil pump and a control device, wherein the tested oil pump is connected to the control device, the driving motor and the torque and speed measuring instrument respectively, the oil outlet of the tested oil pump is connected to the oil outlet pipeline, and the oil outlet pipeline is connected to the first pressure transmitter, characterized in that: the oil outlet pipeline is branched into two sub-pipelines, the two sub-pipelines are respectively connected to the main oil tank, and the first regulating valve and the mass flow meter are respectively arranged on the two sub-pipelines from the oil outlet direction, the oil inlet of the tested oil pump is connected to the oil inlet pipeline, and the oil inlet pipeline is respectively connected to the valve, the second pressure transmitter and the temperature transmitter, the main oil tank is connected to the auxiliary oil tank, the oil inlet pipeline between the main oil tank and the auxiliary oil tank is connected to the first oil filter and the circulating pump, and the driving motor, the torque and speed measuring instrument, the first pressure transmitter, the first regulating valve, the mass flow meter, the valve, the second pressure transmitter, the temperature transmitter, the first oil filter and the circulating pump are respectively connected to the control device; The two sub-pipelines include an oil outlet pipeline with a diameter of DN20 and an oil outlet pipeline with a diameter of DN10, and the corresponding flow measurement ranges are 6L / min to 100L / min and 0.1L / min to 30L / min respectively; The two sub-pipelines are respectively provided with a mass flow meter, which measures the flow data of the corresponding sub-pipeline and transmits the flow data to the control device, which compares the measured flow data with the preset flow value. When the absolute value of the difference between the two is greater than 0.2%, the valve opening of the first regulating valve is adjusted to change the flow of the corresponding sub-pipeline, thereby realizing the measurement and control of the oil supply of the tested oil pump; The driving motor drives the front-end driving shaft via a synchronous belt, the front-end driving shaft drives the main shaft, the main shaft drives the tested oil pump via an elastic connecting piece, the tested oil pump is installed in a horizontal manner with the main shaft, the front-end driving shaft and the main shaft are both installed on a bearing seat, the torque and speed measuring instrument is horizontally coaxially installed between the two bearing seats, and the bearing seat has an oil circuit lubrication system; The torque and speed measuring instrument is connected to the control device through a signal line, the drive motor is connected to the frequency converter, and the frequency converter is connected to the control device; The torque speed measuring instrument measures the speed of the tested oil pump and transmits the measured speed data to the control device. The control device receives the speed data. When the absolute value of the difference between the measured speed value and the preset speed value is greater than 2rpm, the control device changes the speed of the drive motor through the frequency converter, and the drive motor drives the tested oil pump to achieve measurement and control of the speed of the tested oil pump.

2. An internal combustion engine transmission oil pump performance test system as claimed in claim 1, characterized in that: The first pressure transmitter measures the pressure at the oil outlet of the tested oil pump and transmits the measured pressure value to the control device. The control device compares the measured pressure value with the preset pressure value, and controls the valve position sensor and valve motor connected to the first regulating valve according to the difference between the two to change the valve opening of the first regulating valve, thereby realizing the measurement and control of the pressure of the tested oil pump.

3. An internal combustion engine transmission oil pump performance test system as claimed in claim 1, characterized in that: A liquid level sensor is arranged in the main oil tank, and the liquid level sensor is connected to the control device; The liquid level sensor measures the oil level in the main oil tank and transmits the oil level value to the control device, which compares the measured oil level value with a preset height value. When the measured oil level is lower than the preset height value, the circulation pump is turned on to allow the oil to enter the main oil tank through the auxiliary oil tank and the first oil filter. When the measured oil level reaches the preset height value, the circulation pump is turned off to achieve measurement and control of the oil level.

4. The internal combustion engine transmission oil pump performance test system according to claim 1, characterized in that: A heater, a first temperature sensor and a second temperature sensor are arranged in the main oil tank, and the heater, the first temperature sensor and the second temperature sensor are connected to the control device respectively.

5. An internal combustion engine transmission oil pump performance test system as claimed in claim 4, characterized in that: The first temperature sensor and the second temperature sensor respectively measure the oil temperature in the main oil tank and transmit the oil temperature data to the control device respectively. The control device compares the two sets of oil temperature data received. When the difference between the two sets of oil temperature data is higher than the preset difference, an early warning prompt is issued to the user to achieve an early warning of oil temperature out of control.

6. An internal combustion engine transmission oil pump performance test system as claimed in claim 4 or 5, characterized in that: The first temperature sensor or the second temperature sensor measures the oil temperature in the main oil tank and transmits the oil temperature data to the control device, which compares the received oil temperature data. When the measured oil temperature data is lower than the preset oil temperature value, the heater is started to heat the oil in the main oil tank; when the measured oil temperature data is not lower than the preset oil temperature value, the heater is turned off to achieve measurement and control of the oil temperature.

7. An internal combustion engine transmission oil pump performance test system as claimed in claim 1, characterized in that: The tested oil pump is connected to the hydraulic station through a hydraulic pipeline, and a second oil filter, an oil pump motor, a second regulating valve and a clamping cylinder are sequentially arranged on the hydraulic pipeline. The clamping cylinder is connected to the tested oil pump, and the second oil filter, the oil pump motor, the second regulating valve and the clamping cylinder are respectively connected to a control device; the clamping cylinder includes a first clamping cylinder and a second clamping cylinder, and the first clamping cylinder and the second clamping cylinder are connected in parallel.

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