CN201548404U - Gasoline engine variable valve timing performance test device - Google Patents

Abstract

The utility model discloses a gasoline engine variable valve timing performance test device, which is used to detect the performance parameters of the automobile gasoline engine variable valve timing under different working conditions, including a test workbench, a hydraulic part and a control part, a hydraulic The part is connected with the pipeline of the test bench, and the control part is connected with the test bench and the hydraulic part. The test bench includes a frame on which the test piece is set, and the drive motor and transmission are also arranged on the frame. A shaft, a torque sensor is arranged between the output shaft of the driving motor and the transmission shaft, the transmission shaft is connected to the test piece, and the drive motor drives the transmission shaft to rotate to realize the rotation of the test piece. The utility model can automatically test the comprehensive performance of the variable valve timing of the gasoline engine according to the test requirements. By optimizing the system structure and rationally selecting components, the accuracy of the test and control can be guaranteed, and the completeness of the test process can be realized according to the predetermined test plan. automation.

Description

Gasoline engine variable valve timing performance test device

technical field

The utility model relates to the technical field of gasoline engines, in particular to a test device for detecting performance parameters of a variable valve timing (VVT) of an automobile gasoline engine under different working conditions.

Background technique

At present, the domestic automobile industry has not made great progress in the research on variable valve timing (VVT) of gasoline engines, mainly due to the performance requirements of key components and test theories and methods, especially the performance near the limit There has been no major breakthrough in simulating the extreme working environment. The research on the performance test of the variable valve timing (VVT) component of the gasoline engine, the variable hydraulic vane wheel and the OCV valve, is mainly based on theory, while for high speed, high temperature and strong torque It is difficult to test the variable valve timing (VVT) performance parameters of gasoline engines under extreme conditions, especially in terms of test control accuracy and test repeatability, which are difficult to fully guarantee. In addition, due to the large number of test parameters, there is a complex test process. , the degree of automation is not high, the labor workload of operators is large, and the accuracy of manual detection operation is low.

Utility model content

The technical problem to be solved by the utility model is: to overcome the deficiencies in the prior art, to provide a gasoline engine variable valve timing performance test device, which can test the variable valve timing (VVT) of automobile gasoline engines according to the test requirements. The comprehensive performance is automatically tested, and by optimizing the system structure and rationally selecting components, the accuracy and repeatability of the test and control are guaranteed, and the test process can be fully automated according to the predetermined test plan.

The technical scheme adopted by the utility model to solve the technical problem is: a gasoline engine variable valve timing performance test device, which is used to detect the performance parameters of the automobile gasoline engine variable valve timing under different working conditions, including test work platform, hydraulic part and control part, the hydraulic part is connected with the test workbench pipeline, the control part is connected with the test workbench and the hydraulic part line, the test workbench includes a frame, and the test piece is set on the frame, and the machine A driving motor and a transmission shaft are also arranged on the frame, a torque sensor is arranged between the output shaft of the driving motor and the transmission shaft, the transmission shaft is connected to the test piece, and the drive motor drives the transmission shaft to rotate to realize the rotation of the test piece.

In order to reduce the influence of the shock vibration generated by the tested piece on the test data, the transmission shaft is connected with the tested piece through a chain drive.

In order to ensure firm installation and reliable connection, the drive motor is fixed on the frame through the motor base, the transmission shaft is fixed on the motor base through the bearing support, the output shaft of the drive motor is connected with the torque sensor, and the torque sensor is connected with the transmission shaft connected.

Further, in order to better control the working speed of the tested piece, the drive motor line is connected to the frequency converter in the control part, the tail end of the drive motor is also connected to a rotary encoder, and the transmission shaft is connected to the torque sensor A shaft encoder is set on the end, thereby realizing double closed-loop control of the working speed of the tested piece.

In order to realize the control and regulation of the oil volume, oil temperature and oil pressure of the tested piece, the hydraulic part is connected with the pipeline of the tested piece, and the hydraulic part includes the main oil tank, the heater located in the main oil tank, and the main oil tank A temperature sensor, a pressure sensor and a proportional relief valve for regulating the pressure are connected in the pipeline.

In order to stabilize the experiment under high temperature conditions, the heater installed in the main oil tank has a sensor that can detect the surface temperature of the heater itself to control the surface temperature of the heater, and the temperature sensor connected to the main oil tank is used to test the hydraulic oil. Temperature, thereby realizing double closed-loop control of hydraulic oil temperature.

The beneficial effects of the utility model are: the utility model adopts the combination of electromechanical and hydraulic methods to realize the performance test of the variable valve timing (VVT) of the gasoline engine for automobiles, and can detect the variable valve timing (VVT) of the gasoline engine. ) Main performance parameters such as initial phase angle, phase angle after OCV action, relationship curve between OCV control PWM modulation duty cycle and phase angle action under different temperatures, different speeds, different torques and different load pressures, with high test accuracy, And it can realize the complete automation of the test process according to the predetermined test plan.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a structural representation of the utility model.

Fig. 2 is a schematic diagram of the hydraulic part of the utility model.

Fig. 3 is a functional block diagram of the control part of the utility model.

Fig. 4 is a schematic diagram of the workflow of the testing process of the utility model.

In the figure 1. Hydraulic part 2. Control part 3. Rack 4. Tested piece 5. Drive motor 6. Transmission shaft 7. Torque sensor 8. Chain 9. Motor seat 10. Bearing support 11. Shaft encoder 12. Anti-vibration mat 13. Main oil tank 14. Heater 15. Temperature sensor 16. Pressure sensor 17. Proportional overflow valve 18. Main oil pump 19. Filter 20. Pressure gauge 21. Upper and lower liquid level relay 22. Auxiliary oil tank 23 .Auxiliary oil pump

Detailed ways.

The utility model is described further in conjunction with accompanying drawing now. These drawings are all simplified schematic diagrams, and only schematically illustrate the basic structure of the utility model, so they only show the configurations related to the utility model.

A gasoline engine variable valve timing performance test device as shown in Figure 1 is used to detect the performance parameters of automobile gasoline engine variable valve timing (VVT) under different working conditions, including a test bench, a hydraulic part 1 And the control part 2, the hydraulic part 1 is connected with the test workbench pipeline, and the control part 2 is connected with the test workbench and the hydraulic part 1 circuit.

The test workbench of the physical part of the test device includes a frame 3, and the test piece 4 (i.e. VVT) is arranged on the top of the frame 3, and the lower part of the frame 3 is fixed with a drive motor 5 through a motor base 9, and the drive motor 5 is connected to a circuit. The frequency converter located in the control part is also connected with a rotary encoder at the end of the drive motor 5. The drive motor 5, the rotary encoder and the frequency converter constitute a motor vector control system. The rotational speed of the drive motor 5 detected by the rotary encoder is directly It is fed back to the frequency converter, and the output frequency is adjusted after comparing with the speed required for the test, so as to realize the high-precision and high-dynamic response control of the driving motor 5 speed, and also realize the double closed-loop control of the working speed of the tested object 4; in the motor The transmission shaft 6 is fixed on the seat 9 through the bearing support 10, a torque sensor 7 is arranged between the output shaft of the driving motor 5 and the transmission shaft 6, and a high-precision, high-precision High-resolution shaft encoder 11, in order to reduce the impact of the impact vibration generated by the test piece 4 on the test data, the transmission shaft 6 and the test piece 4 are connected by a constant speed transmission through the chain 8, and the driving motor 5 drives the transmission shaft 6 to rotate In order to realize the rotation of the tested piece 4, the speed of the transmission shaft 6 is also the actual working speed of the tested piece 4. Through the torque sensor 7 connected to the transmission shaft 6, the speed of the tested piece 4 in the working state can be tested. Torque and actual working speed, anti-vibration mat 12 is arranged between the frame 3 and the installation ground, which can avoid the vibration caused by rigid contact.

In order to realize the control and adjustment of the oil volume, oil temperature and oil pressure of the tested piece, the tested piece 4 is connected with the hydraulic part 1 pipeline.

As shown in Figure 2 is the schematic diagram of the hydraulic part 1 of the utility model, the hydraulic oil input by the test piece 4 is extracted from the main oil tank 13 by the main oil pump 18, and filtered by a high-density filter 19 to ensure that no impurities enter the hydraulic pressure. system, the precision components are damaged, the temperature and pressure of the hydraulic oil input to the test piece 4 are detected by the temperature sensor 15 and the pressure sensor 16 and sent to the computer control system of the control part 2, and the pressure gauge 20 is directly displayed, which is convenient for automatic Observed by the operator during the test. The high-precision proportional relief valve 17 dynamically adjusts the load pressure of the test piece 4 according to the value of the pressure sensor 16. The control of the proportional relief valve 17 is realized by the PLC output current signal of the computer control system through the valve body controller; the main oil tank 13 There is a liquid level indication mark on the outer surface of the tank, and there are upper and lower liquid level relays 21, which output an alarm signal when the liquid level is lower or higher than the set level; the heater 14 in the main oil tank 13 has a detectable heating function The sensor of the surface temperature of the heater 14 itself is used to control the surface temperature of the heater 14, monitor its surface temperature in real time, and prevent the oil from deteriorating after the surface temperature exceeds the ignition point of the test oil. The temperature sensor 15 connected to the main oil tank 13 is used to test the hydraulic pressure. The temperature of the oil is compared with the set temperature, and the intelligent thyristor is controlled by the PLC output current signal of the control part 2 to realize the double closed-loop control of the experimental oil temperature; the hydraulic return oil after the test enters the auxiliary oil tank 22, and the auxiliary oil tank 22 has upper and lower Liquid level relay 21, when the oil level in the auxiliary oil tank 22 exceeds the set oil level, the PLC outputs a switch signal, starts the auxiliary oil pump 23 to pump the hydraulic oil into the main oil tank 13, and when the hydraulic oil level in the auxiliary oil tank 22 is lower than the set value The rear auxiliary oil pump 23 stops.

As shown in Figure 3 is the functional block diagram of the control part 2 of the present utility model, the arrow represents the direction of signal transmission, the same type of signal or the unit of the same control mode are represented in the same dotted line frame, the computer control system has a machine-machine exchange interface, Performance testing program and intelligent communication card, the performance testing program includes various subroutines, responsible for the intelligent control of the test process and the preprocessing and recording of test data, the communication module is connected with the PLC communication module, which plays the role of signal transmission, computer control system There are mains power supply and uninterruptible power supply to ensure smooth communication between people after the system is powered off. According to the program setting, the tested object 4 has different load gears under different temperature conditions, and has different speeds under different loads, and completes the corresponding control in a logical order. The PLC analog output module according to the set temperature and The analog input module detects the surface temperature of the heater 14, outputs the corresponding current signal, controls the heater 14 to work through the intelligent thyristor, and when the temperature reaches the set value, the PLC analog output module outputs the current signal through the overflow valve The controller controls the proportional relief valve 17 to achieve a set load pressure, and then the PLC controls the drive motor 5 through the frequency converter, and drives the test piece 4 to work through the drive motor 5, and the speed of the drive motor 5 varies from small to large. It is implemented sequentially. After reaching a certain set value, the program comprehensively detects all control parameters, and records all parameters after meeting the set conditions. Among them, the detected analog signals include the working pressure of the test piece 4, the inlet pressure, the temperature of the main oil tank 13, pipeline temperature and the surface temperature of the heater 14; the pulse signal detected by the high-speed counting module includes the output flow rate of the test piece 4, the leakage flow rate, the working torque signal and the working speed signal detected by the torque sensor 7; the switching signal detected by the PLC is mainly There are the upper and lower liquid level relays 21 of the main oil tank 13 and the auxiliary oil tank 22, the oil suction port filter 19, the filter blockage alarm signal and the safety pressure valve signal, etc.; the switch control signal output by the PLC mainly includes detection of the oil level of the auxiliary oil tank 22 exceeding the limit Start or stop auxiliary oil pump 23 afterward, active protection and sound and light alarm signal after various signals exceed limit.

Fig. 4 is a schematic diagram of the main workflow of the testing process of the utility model. In terms of test item setting, it mainly includes temperature setting, load pressure setting and the setting of the 4 speeds of the test piece. Control the corresponding execution unit, record various parameters after the conditions are met, and detect the operating status of the system in a timely manner until the control status reaches the maximum load pressure under the set maximum temperature condition and the maximum speed of the tested piece 4, and record all parameters. Complete the test work, and sound and light alarm prompts.

The workflow that the test device described in the utility model carries out automated testing is:

1. The experimenter installs the test piece 4 (VVT), checks and runs the test device;

2. Open the program to set the test environment one by one, such as different temperatures, different motor speeds and different load pressures.

3. After the setting is completed, the drive motor 5 is powered on, and the zero position automatic calibration program of the tested object 4 (VVT) is first run to calibrate the initial phase of the tested object 4 (VVT).

4. Start the test. There are many items in the whole test process. The automatic test follows the logic sequence from low temperature to high temperature, from low speed to high speed, and the load pressure from low pressure to high pressure.

5. After the project test is completed, it will output sound and light signal prompts, and intelligent power-off protection.

6. Take out the data analysis, manually power off, complete the test, and unload the test piece 4.

Claims (6)

1. variable valve timing performance test device of gasoline engine, comprise test bench, hydraulic part (1) and control section (2), hydraulic part (1) is connected with the test bench pipeline, control section (2) is connected with hydraulic part (1) circuit with test bench respectively, it is characterized in that: described test bench comprises frame (3), test specimen (4) is arranged on the frame (3), also be provided with drive motor (5) and transmission shaft (6) on the frame (3), between drive motor (5) output shaft and transmission shaft (6), be provided with torque sensor (7), transmission shaft (6) is in transmission connection with test specimen (4), and drive motor (5) drives transmission shaft (6) and rotates to realize the rotation of test specimen (4).

2. variable valve timing performance test device of gasoline engine according to claim 1 is characterized in that: described transmission shaft (6) is in transmission connection by chain (8) with test specimen (4).

3. variable valve timing performance test device of gasoline engine according to claim 1, it is characterized in that: described drive motor (5) is fixed on the frame (3) by motor cabinet (9), transmission shaft (6) is fixed on the motor cabinet (9) by bearing spider (10), the output shaft of drive motor (5) is connected with torque sensor (7), and torque sensor (7) is connected with transmission shaft (6).

4. variable valve timing performance test device of gasoline engine according to claim 1, it is characterized in that: described drive motor (5) circuit connects the frequency converter that is located at control section (2), the tail end of drive motor (5) also is connected with rotary encoder, and transmission shaft (6) is held with being connected of torque sensor (7) and is set with shaft encoder (11).

5. variable valve timing performance test device of gasoline engine according to claim 1, it is characterized in that: described hydraulic part (1) is connected with test specimen (4) pipeline, and hydraulic part (1) comprises main fuel tank (13), is located at well heater (14), the temperature sensor (15), the pressure transducer (16) that are connected with main fuel tank (13) pipeline in the main fuel tank (13) and the proportional pressure control valve (17) that is used to regulate pressure.

6. variable valve timing performance test device of gasoline engine according to claim 5 is characterized in that: described well heater (14) has the sensor that can detect self surface temperature.

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