Automobile Transmission Performance Test Oil Injection Hydraulic System

Abstract

The present invention discloses a hydraulic system, in particular, a hydraulic system for oil injection in the performance test of an automotive transmission. Its structure is as follows: The oil temperature control unit is connected to the fuel tank (1). The oil temperature control unit is composed of a heater (19) arranged in the fuel tank (1), a circulation pump (21) communicated with the fuel tank (1) through a pipeline, and a cooler (18). The circulation pump (21) and the cooler (18) are communicated with each other through a pipeline. The fuel tank (1) is communicated with the automotive transmission through an oil delivery pipeline. A power unit, a detection element unit, and a control element unit are arranged on the oil delivery pipeline. The electric control box is electrically connected to the power unit, the detection element unit, and the control element unit. The transmission oil of the oil injection hydraulic system of the present invention can be controlled at a constant temperature and can simulate a high-temperature environment. The oil pressure injected into the transmission can automatically compensate and change with the rotation speed of the transmission. It has the characteristics of providing stable pressure, temperature, and flow rate.

Description

Technical Field

[0001] The present invention relates to a hydraulic system, and particularly to an oil injection hydraulic system for performance testing of an automotive transmission. Background Art

[0002] An automotive transmission mainly consists of a torque converter, a transmission mechanism, a control device, etc. The latter mainly consists of sensors, an electronic control unit, and an actuator unit. After the transmission is produced, the product must be placed on a test bench for a series of corresponding performance tests, and it can only be allowed to leave the factory after strictly meeting the requirements. The tests conducted can effectively diagnose whether the product meets the standards. The steps are as follows: First, basic inspection of the automatic transmission is required, checking whether the automatic transmission oil level is appropriate, injecting high-quality transmission oil, detecting whether the automatic transmission leaks, and whether there are any abnormalities in the transmission linkage mechanism and engine operation. Shifting at different speeds is required to test whether the mechanical hydraulic system meets the requirements. During the test process, there must be a simulated automotive transmission oil supply system that can provide a hydraulic system for the transmission with a flow rate that changes with the rotational speed, and stable pressure and temperature.

[0003] Chinese Patent, Patent Publication No. CN105136452A, discloses a hydraulic loading system for light testing of a transmission test bench; Chinese Patent, Patent Publication No. CN114812970A, discloses a hydraulic test bench system for an automatic transmission; Chinese Patent, Patent Publication No. CN113864289A, discloses a simulation platform for a hydraulic system of a hybrid vehicle and its implementation method; Chinese Patent, Patent Publication No. CN112326237A, discloses a performance detection test bench for a hydro-mechanical continuously variable transmission. The above several patents only provide power for the hydraulic part, and the equipment does not have a constant temperature device; the pressure adjustment is a fixed mechanical adjustment, not a proportional feedback closed-loop adjustment; therefore, the hydraulic parts of the test benches disclosed in the above-mentioned published documents all have the following technical problems: 1. The transmission oil cannot be temperature-controlled and cannot simulate a high-temperature environment; 2. The oil pressure injected into the transmission cannot automatically compensate and change with the rotational speed of the transmission. Summary of the Invention

[0004] The present invention is to solve the above technical problems, and provides an oil injection hydraulic system for performance testing of an automotive transmission. The transmission oil of the oil injection hydraulic system of the present invention can be temperature-controlled and can simulate a high-temperature environment. The oil pressure injected into the transmission can automatically compensate and change with the rotational speed of the transmission, and it has the characteristics of providing stable pressure, temperature, and flow rate.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] Automobile transmission performance test oil injection hydraulic system, which includes an oil tank, an oil filling port, and an oil temperature control unit connected to the oil tank. The oil temperature control unit is composed of a heater arranged in the oil tank, a circulation pump connected to the oil tank through a pipeline, and a cooler. The circulation pump and the cooler are connected through a pipeline. The oil tank is connected to the automobile transmission through an oil pipeline. A power unit, a detection element unit, and a control element unit are arranged on the oil pipeline. The electric control box is electrically connected to the power unit, the detection element unit, and the control element unit.

[0007] Preferably, a visual liquid level gauge is arranged on the oil tank, and a heat preservation layer is arranged on the outer shell of the oil tank.

[0008] Preferably, the oil pipeline is divided into two paths, one is the oil outlet pipeline and the other is the oil return pipeline. A valve block is arranged on the oil outlet pipeline. Two branch pipelines are arranged between the valve block and the automobile transmission. A first high-pressure filter is arranged on the oil outlet pipeline, and a second high-pressure filter is arranged on the oil return pipeline.

[0009] Preferably, the power unit is composed of a pump group, including a first oil injection pump and a first motor installed at the oil outlet of the oil tank on the oil outlet pipeline, and a third oil injection pump and a third motor arranged at the oil outlet of the automobile transmission on the oil return pipeline.

[0010] Preferably, the power unit is provided with a standby pump group, which is a second oil injection pump and a second motor. The second oil injection pump and the second motor are connected in parallel with the first oil injection pump and the first motor and connected to the oil outlet pipeline.

[0011] Preferably, a first oil suction filter is arranged at the oil inlet of the first oil injection pump in the oil tank, and a second oil suction filter is arranged at the oil inlet of the second oil injection pump in the oil tank.

[0012] Preferably, the detection elements include a pressure gauge, a pressure sensor, a temperature sensor, and a liquid level sensor.

[0013] Preferably, the first pressure gauge is installed on the first pressure gauge switch, and the first pressure gauge switch is arranged at the oil outlet of the first oil injection pump. The second pressure gauge is installed on the second pressure gauge switch, and the second pressure gauge switch is arranged at the oil outlet of the second oil injection pump of the equipment. The first pressure sensor and the second pressure sensor are installed at the front and rear positions of the proportional pressure regulating valve on the oil outlet pipeline. The first temperature sensor, the second temperature sensor, and the liquid level sensor are installed on the oil tank.

[0014] Preferably, the control element unit includes a normally open electromagnetic ball valve, a proportional pressure regulating valve, a speed regulating valve, a check valve, and a normally closed electromagnetic ball valve.

[0015] Preferably, the normally open electromagnetic ball valve is installed at the oil outlet of the oil outlet pipeline. The air source is connected to the normally closed electromagnetic ball valve, and the normally closed electromagnetic ball valve is connected to the oil outlet pipeline between the electromagnetic ball valve and the oil outlet through an air delivery pipeline; the proportional pressure regulating valve is installed at the oil outlet end of the oil injection pump on the oil delivery pipeline. The first speed regulating valve, the second speed regulating valve and the third speed regulating valve are installed on the oil outlet pipeline and the branch pipeline. The oil outlet of the first oil injection pump is provided with a first one-way valve, the oil outlet of the second oil injection pump is provided with a second one-way valve, and the third one-way valve is arranged on the oil delivery pipeline between the module and the automotive transmission.

[0016] Due to the above technical problems, the present invention has the following characteristics and effects:

[0017] The transmission oil of the oil injection hydraulic system for the performance test of the automotive transmission of the present invention can be subjected to constant temperature control, can simulate a high-temperature environment, and the oil pressure injected into the transmission can automatically compensate and change with the rotation speed of the transmission. It has the characteristics of providing stable pressure, temperature and flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the schematic diagram of the hydraulic system of the present invention.

[0019] In the figure, 1, oil tank; 201, first oil suction filter; 202, second oil suction filter; 3, oil filling port; 4, visible liquid level gauge; 501, first oil injection pump; 502, second oil injection pump; 503, third oil injection pump; 601, first motor; 602, second motor; 603, third motor; 7, normally open electromagnetic ball valve; 8, proportional pressure regulating valve; 901, first speed regulating valve; 902, second speed regulating valve; 903, third speed regulating valve; 1001, first high-pressure filter; 1002, second high-pressure filter; 1101, first pressure gauge switch; 1102, second pressure gauge switch; 1201, first pressure gauge; 1202, second pressure gauge; 13, valve block; 1401, first one-way valve; 1402, second one-way valve; 1403, third one-way valve; 1501, first pressure sensor; 1502, second pressure sensor; 1601, first temperature sensor; 1602, second temperature sensor; 17, liquid level sensor; 18, cooler; 19, heater; 20, normally closed electromagnetic ball valve; 21, circulation pump; 22, electric control box. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] As Figure 1 shown, the structure of the oil injection hydraulic system for the performance test of the automotive transmission of the present invention is as follows: A fuel filling port 3 is provided on the fuel tank 1. The oil temperature control unit is connected to the fuel tank 1. The oil temperature control unit is composed of a heater 19 arranged in the fuel tank 1, a circulation pump 21 communicated with the fuel tank 1 through a pipeline, and a cooler 18. The circulation pump 21 and the cooler 18 are communicated through a pipeline; the fuel tank 1 is communicated with the automotive transmission through an oil delivery pipeline. A power unit, a detection element unit, and a control element unit are arranged on the oil delivery pipeline. The electric control box is electrically connected to the power unit, the detection element unit, and the control element unit. A visible liquid level gauge 4 is provided on the fuel tank 1. The outer shell of the fuel tank 1 is provided with a heat preservation layer.

[0022] The above-mentioned oil delivery pipeline is divided into two paths, one is the oil outlet pipeline and the other is the oil return pipeline. A valve block 13 is arranged on the oil outlet pipeline. Two branch pipelines are arranged between the valve block 13 and the automotive transmission. A first high-pressure filter 1001 is arranged on the oil outlet pipeline, and a second high-pressure filter 1002 is arranged on the above-mentioned oil return pipeline.

[0023] The above-mentioned power unit is composed of a pump group, including a first oil injection pump 501 and a first motor 601 installed at the oil outlet of the fuel tank on the oil outlet pipeline, a third oil injection pump 503 and a third motor 603 arranged at the oil outlet of the automotive transmission on the oil return pipeline. In order to ensure the safety of the oil delivery system during the test, a standby pump group is provided. The standby pump group is a second oil injection pump 502 and a second motor 602. The second oil injection pump 502 and the second motor 602 are connected in parallel with the first oil injection pump 501 and the first motor 601 and are connected into the oil outlet pipeline.

[0024] A first oil suction filter 201 is arranged at the oil inlet of the first oil injection pump 501 in the above-mentioned fuel tank 1, and a second oil suction filter 202 is arranged at the oil inlet of the second oil injection pump 502 in the fuel tank 1.

[0025] The above-mentioned detection elements include a pressure gauge, a pressure sensor, a temperature sensor, and a liquid level sensor. Among them, a first pressure gauge 1201 is installed on a first pressure gauge switch 1101, and the first pressure gauge switch 1101 is arranged at the oil outlet of the first oil injection pump 501. A second pressure gauge 1202 is installed on a second pressure gauge switch 1102, and the second pressure gauge switch 1102 is arranged at the oil outlet of the second oil injection pump 502 of the equipment. A first pressure sensor 1501 and a second pressure sensor 1502 are installed at the front and rear positions of the proportional pressure regulating valve 8 on the oil outlet pipeline. A first temperature sensor 1601, a second temperature sensor 1602, and a liquid level sensor 17 are installed on the fuel tank.

[0026] The above control element unit includes a normally open electromagnetic ball valve, a proportional pressure regulating valve, a speed regulating valve, a check valve, and a normally closed electromagnetic ball valve. Among them, the normally open electromagnetic ball valve 7 is installed at the oil outlet of the oil outlet pipeline, the air source is connected to the normally closed electromagnetic ball valve 20, and the normally closed electromagnetic ball valve 20 is connected to the oil outlet pipeline between the electromagnetic ball valve 7 and the oil outlet through an air pipeline. The proportional pressure regulating valve 8 is installed at the oil outlet end of the oil injection pump on the oil pipeline, and the first speed regulating valve 901, the second speed regulating valve 902, and the third speed regulating valve 903 are installed on the oil outlet pipeline and the branch pipeline. The oil outlet of the first oil injection pump 501 is provided with a first check valve 1401, the oil outlet of the second oil injection pump 502 is provided with a second check valve 1402, and the third check valve 1403 is arranged on the oil pipeline between the module 13 and the automotive transmission.

[0027] The above-mentioned electric control box 22 is connected to the first motor 601, the second motor 602, the third motor 603, and the circulation pump 21 of the power unit through cables; the electric control box 22 is connected to the proportional pressure regulating valve 8, the solenoid valve 7, and the solenoid valve 20 of the control unit through cables; the electric control box 22 is connected to the first temperature sensor 1601, the second temperature sensor 1602, the liquid level sensor 17, the first pressure sensor 1501, and the second pressure sensor 1502 of the detection unit through cables.

[0028] The above-mentioned first oil injection pump 501, the second oil injection pump, and the third oil injection pump 503 adopt oil injection pumps of model YCB1.6 - 0.6; the normally open electromagnetic ball valve 7 adopts an electromagnetic ball valve of model ZQDF - 2 - K - DN15; the proportional pressure regulating valve 8 adopts a pressure regulating valve of model ZDLP - DN15; the normally closed electromagnetic ball valve 20 adopts an electromagnetic ball valve of model ZQDF - 2; the circulation pump 21 adopts a circulation pump of model 25WBS 2 - 8 - 0.25.

[0029] The above-mentioned power unit part: The method of driving the oil injection pump with a 750W motor is adopted. Since long-term tests need to be carried out, the oil injection pump and the motor are used in a one-for-one standby mode; the oil injection pump adopts a high-performance metal-sealed gear pump that can withstand high temperatures; Control element unit part: The safety pressure switch of the pump sets the maximum pressure of the pump, the proportional pressure regulating valve can set the pressure according to the speed of the gearbox, the flow valve can set the size of the flow, and the solenoid valve can control the on-off of the oil supply; Oil temperature control unit: The high-temperature gearbox oil is pumped from the fuel tank to the air cooler by the circulating pump, cooled, filtered through the filter, and then returned to the fuel tank; The gearbox oil is heated by the heater; The fuel tank and the oil pipe are heat-insulated through the heat-insulation layer structure; Detection element unit: The pressure transmitter and the pressure gauge set at the pipeline outlet can realize pressure detection, the temperature sensor can realize temperature detection, and the liquid level sensor can realize liquid level detection; The electric control box set on the hydraulic system can realize the start and stop of each motor manually and automatically, and control the output pressure size through each sensor and program command; The pressure and temperature parameters can be digitally displayed; This system can accurately control the pressure, flow and temperature of the gearbox oil input into the gearbox.

[0030] The working process and working principle of the present invention are as follows:

[0031] Before use, first inject the gearbox oil into the fuel tank 1 with heat-insulation function. The liquid level in the fuel tank 1 can be detected in real time through the liquid level sensor 17. Connect the power supply, set the temperature point start button on the electric control box, and the system enters the automatic heating and constant temperature state. When the temperature reaches the set temperature, the fuel tank stops heating. When the temperature is higher than the set temperature, the system automatically starts the circulating pump 21 to pump the hot oil out of the fuel tank 1, cool it through the cooler 18, and then return it to the fuel tank 1. The constant temperature control of the temperature is realized through this function. The temperature detection is realized through the temperature sensor set on the fuel tank; The heating is realized through the heater 19; The cooling is realized through the circulating pump 21 and the cooler 18.

[0032] After the temperature reaches the set temperature, the first motor 601 is started to drive the first oil injection pump 501. The variable speed oil in the fuel tank passes through the following components in sequence and is first injected into the first one-way valve 1401. The first one-way valve is a component to protect the pump from the backflow of the transmission oil; the first oil injection pump 501 itself has a pressure regulating function, and the set pressure is detected and displayed by the first pressure gauge 1201 installed on the first pressure gauge switch 1101; then the variable speed oil is divided into two paths by the valve block. One path passes through the proportional pressure regulating valve 8, the first pressure sensor 1501, the first speed regulating valve 901 (adjusting the maximum required flow rate), the first high-pressure filter 1001, and the normally open electromagnetic ball valve 7 and enters the transmission oil injection port; here, the proportional pressure regulating valve 8 and the first pressure sensor 1501 form a closed-loop control. After setting the required pressure on the electric control box, the PLC will give the proportional valve an analog value of 4 - 20 mA. The proportional pressure regulating valve 8 adjusts the opening degree according to the size of the analog value, thereby adjusting the pressure. The outlet pressure is transmitted to the PLC through the sensor, and the set value is compared with the detected value. If the pressure is greater than the set value, the output is reduced; if it is less than the set value, the output is increased; after the transmission oil enters the transmission test bench, as the speed of the transmission system continuously increases, the required oil pressure is different. According to the pre-planned speed-pressure data table, we can flexibly set different pressures during different speed tests and achieve stable pressure output through the above-mentioned pressure closed-loop; since the first speed regulating valve 901 is a mechanical speed regulating valve and has a pressure compensation function, the flow rate will not change with the pressure after it is set, thus realizing the stable flow output function. When the first oil injection pump fails, the second oil injection pump can be started, and the working principle is the same as described above and will not be repeated. The oil return pipeline is used to pump the oil in the transmission back to the fuel tank.

[0033] The other path of oil enters the second speed regulating valve 901 and the third speed regulating valve 903 through the second one-way valve 1402, and these two paths are used for lubricating the test equipment; the second pressure sensor 1502 can detect the pressure output by the pump; when the test is completed, press the stop button, the normally closed electromagnetic ball valve 20 is energized, and the normally open electromagnetic ball valve 7 is energized. Compressed air enters the transmission through the normally closed electromagnetic ball valve 20 to clean the transmission oil in the transmission box.

Claims

1. The oil injection hydraulic system for the performance test of an automotive transmission, which comprises an oil tank (1) and an oil filling port (3), is characterized in that The oil temperature control unit is connected to the fuel tank (1). The oil temperature control unit consists of a heater (19) arranged in the fuel tank (1), a circulation pump (21) communicated with the fuel tank (1) through a pipeline, and a cooler (18). The circulation pump (21) is communicated with the cooler (18) through a pipeline. The fuel tank (1) is communicated with the vehicle transmission through an oil pipeline. A power unit, a detection element unit, and a control element unit are arranged on the oil pipeline. The electric control box is electrically connected to the power unit, the detection element unit, and the control element unit; The oil pipeline is divided into two paths, one is the oil outlet pipeline and the other is the oil return pipeline. A valve block (13) is arranged on the oil outlet pipeline. There are two branch pipelines between the valve block (13) and the vehicle transmission. A first high-pressure filter (1001) is arranged on the oil outlet pipeline, and a second high-pressure filter (1002) is arranged on the oil return pipeline; The power unit consists of a pump set, including a first oil injection pump (501) and a first motor (601) installed at the oil outlet of the fuel tank on the oil outlet pipeline, and a third oil injection pump (503) and a third motor (603) arranged at the oil outlet of the vehicle transmission on the oil return pipeline; The power unit is provided with a standby pump set, which is a second oil injection pump (502) and a second motor (602). The second oil injection pump (502) and the second motor (602) are connected in parallel with the first oil injection pump (501) and the first motor (601) and connected into the oil outlet pipeline; The control element unit includes a normally open electromagnetic ball valve (7), a proportional pressure regulating valve (8), a speed regulating valve, a one-way valve, and a normally closed electromagnetic ball valve (20); The normally open electromagnetic ball valve (7) is installed at the oil outlet of the oil outlet pipeline. The air source is connected to the normally closed electromagnetic ball valve (20). The normally closed electromagnetic ball valve (20) is connected to the oil outlet pipeline between the electromagnetic ball valve (7) and the oil outlet through an air pipeline. The proportional pressure regulating valve (8) is installed at the oil outlet end of the oil injection pump on the oil pipeline. A first speed regulating valve (901), a second speed regulating valve (902), and a third speed regulating valve (903) are installed on the oil outlet pipeline and the branch pipelines. A first one-way valve (1401) is arranged at the oil outlet of the first oil injection pump (501), a second one-way valve (1402) is arranged at the oil outlet of the second oil injection pump (502), and a third one-way valve is arranged on the oil pipeline between the valve block (13) and the vehicle transmission.

2. The oil injection hydraulic system for the performance test of an automotive transmission according to claim 1, is characterized in that A visible liquid level gauge (4) is arranged on the fuel tank (1), and the outer shell of the fuel tank (1) is provided with a heat preservation layer.

3. The oil injection hydraulic system for the performance test of an automotive transmission according to claim 1, is characterized in that A first oil suction filter (201) is arranged at the oil inlet of the first oil injection pump (501) in the fuel tank (1), and a second oil suction filter (202) is arranged at the oil inlet of the second oil injection pump (502) in the fuel tank (1).

4. The oil injection hydraulic system for the performance test of an automotive transmission according to claim 1, is characterized in that The detection elements include a pressure gauge, a pressure sensor, a temperature sensor, and a liquid level sensor.

5. The oil injection hydraulic system for the performance test of an automotive transmission according to claim 4, is characterized in that The first pressure gauge (1201) is installed on the first pressure gauge switch (1101), and the first pressure gauge switch (1101) is set at the oil outlet of the first oil injection pump (501). The second pressure gauge (1202) is installed on the second pressure gauge switch (1102), and the second pressure gauge switch (1102) is set at the oil outlet of the second oil injection pump (502) of the equipment. The first pressure sensor (1501) and the second pressure sensor (1502) are installed at the front and rear positions of the proportional pressure regulating valve (8) on the oil outlet pipeline. The first temperature sensor (1601), the second temperature sensor (1602) and the liquid level sensor (17) are installed on the fuel tank.

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