CN105699011B - Simulated automotive tire rotates and the engine bench test system of air pressure inside variation - Google Patents

Abstract

The invention provides a bench test system for simulating the rotation of automobile tires and the change of internal air pressure, and realizes the laboratory test of various dynamic and static functions of a tire pressure monitoring system (TPMS). The system includes a rotating pressure-bearing device (simulated tire), inflation and deflation device, water/air linkage sealing device, rotation drive device, data acquisition and processing and control system. Adjust the speed of the simulated tire through PLC and frequency converter, and when the simulated tire is running at high speed, use the preset program or manual control method to realize the internal inflation and deflation of the simulated tire through PLC, pressure transmitter and control valve, and accurately control and adjust The internal air pressure simulates and realizes under-inflated tires, over-inflated tires, rapid tire leaks, etc. when the car is driving, and is used to detect tire pressure monitoring and alarm functions of the tire pressure monitoring system. The detection process can be compared repeatedly, which not only improves the detection accuracy, but also improves the work efficiency, and can avoid the safety hazards caused by the actual vehicle test.

Description

Bench test system that simulates car tire rotation and internal air pressure changes

technical field

The invention belongs to the field of automobile passive safety testing and relates to a detection system for dynamic and static functions of a tire pressure monitoring system (TPMS).

Background technique

At present, the detection of automobile tire pressure monitoring system is based on the national standard "Automotive tire pressure monitoring system based on tire pressure monitoring module" (GB/T 26149). When the car is running at high speed, the speed of the highest test point is required to reach 120 km/h, and at this speed, the tire pressure must be continuously deflated to the specified value and then stop deflation. It is a great safety hazard, and it is extremely difficult and dangerous to realize data collection of test components in a car running at high speed. The present invention proposes a system including functions such as dynamic inflation and deflation, dynamic water/air sealing, dynamic speed control, and data scanning frequency reception under simulated driving state of a car, so as to realize full coverage of detection items required by the standard under the state of a real car, and test The results are highly accurate and can be compared repeatedly, and the entire test process is safe and standardized, which can avoid potential safety hazards caused by real vehicle tests.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a bench test system for simulating the rotation of automobile tires and the change of internal air pressure, which can adjust the rotational speed of the simulated tires, simulate the changes of the internal pressure environment of the tires under the driving state of the automobile, and simulate the changes in the high-speed driving. In the event of tire under-inflation, over-inflation, rapid air leakage, etc., the laboratory testing of various functions of the tire pressure monitoring system (TPMS) can be realized.

The bench test system for simulating the rotation of automobile tires and the change of internal air pressure includes: a rotating pressure-bearing device, an inflation and deflation device, a water-air interlocking sealing device, a rotating drive device, a data acquisition and processing and control system, and the rotating pressure-bearing device The main structure of the device is a pressure-bearing container with a detachable cover plate. The rotating pressure-bearing device is driven by the rotating drive device to rotate at high speed and adjust the speed to simulate the rotation of the tire at the corresponding speed;

The inflation and deflation device includes a cantilever rotating shaft, a supporting shell and a pressurization system. Each rotating pressure-bearing device is independently installed on the front end of a cantilever rotating shaft. The air chamber is connected to each other. The air chamber is composed of the outer surface of the cantilever shaft, the inner surface of the supporting shell and two sealing rings installed coaxially and separated by a certain distance. , to realize the inflation or deflation of the rotating pressure-bearing device under high-speed rotation;

The water-air interlocking sealing device includes: a watertight chamber is arranged on both sides of the air chamber, and the watertight chamber is composed of the outer surface of the cantilever shaft, the inner surface of the supporting shell and the sealing ring;

The data acquisition processing and control system includes: a pressure transmitter and an air valve are respectively installed at the inlet and outlet of the air chamber, and the pressure of the inlet and outlet is sensed by the pressure transmitter, and the air pressure is controlled by the PLC to control the opening of the valve; first The rotary drive device is controlled by PLC to adjust the speed of the rotary pressure-bearing device, and when the rotary pressure-bearing device is running at high speed, the preset program or manual control method is adopted to realize the rotary pressure-bearing through PLC, pressure transmitter and air valve The interior of the device is inflated and deflated, and the internal air pressure is accurately controlled and adjusted to simulate the tire rotation and internal pressure environment of the car under high-speed motion. The simulated state includes under-inflated tires, over-inflated tires, and rapid tire leaks when the car is running.

When the equipment is running, the watertight chamber is filled with water first, and then the air chamber is inflated and deflated after the watertight chamber is filled with water.

The water in the watertight chamber is circulated for use through a circulating cooling system.

The rotational speed of the simulated tires can be scanned according to the Lop data of different models.

The rotary driving device includes a motor and a frequency converter connected to each other. The frequency converter is connected to a PLC. The cantilever shaft is driven by the motor. The speed of the motor is controlled by the PLC and the frequency converter to realize the stepless speed change of the rotating pressure-bearing device. According to the preset program, different Vehicle models and corresponding tire speeds at different driving speeds; the cantilever shafts corresponding to each rotating pressure-bearing device are driven and controlled by independent motors and frequency converters, which can simulate the speed difference effect of real vehicles when individual tire pressure changes, Realize the detection of the function of the indirect tire pressure monitoring system.

A quick-loading fixture is also provided inside the pressure-bearing container for installing and fixing the sample to be inspected.

The advantages of the present invention are: the rotating speed of the simulated tire is adjusted by PLC and frequency converter, and when the simulated tire is running at high speed, the preset program or manual control mode is adopted to realize the internal filling and discharging of the simulated tire through PLC, pressure transmitter and control valve Accurately control and adjust the internal air pressure, simulate and realize the tire under-inflation, over-inflation, rapid tire leakage and other situations when the car is driving, and it is used to detect the tire pressure monitoring and alarm functions of the tire pressure monitoring system. The detection process can be compared repeatedly, which not only improves the detection accuracy, but also improves the work efficiency, and can avoid the safety hazards caused by the actual vehicle test.

Description of drawings

Fig. 1 is a schematic diagram of the overall frame structure of the present invention.

Fig. 2 is a mechanical structure diagram of the rotary pressure-bearing device and the water/air interlocking sealing device of the present invention.

Fig. 3 is a schematic diagram of the control structure of the present invention.

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

The present invention simulates four tires of a car by four independently controlled rotating pressure-bearing devices, through a dynamic inflation and deflation device, a dynamic water/air linkage sealing device, a rotary drive device 20, a safety protection device, and a data acquisition and processing and control system Realize the simulation of the internal pressure environment of the tire when the car is running, and simulate the situation of under-inflation, over-inflation, and rapid air leakage when driving at high speed. As shown in FIG. 1 , the pressure-bearing container 1 of the pressure-bearing device is rotated by a dynamic inflation and deflation device, a dynamic water/air interlocking sealing device, and a rotary drive device 20 .

1. Rotating pressure-bearing device (simulated tire).

As shown in the left part of Figure 2, the main structure of the rotary pressure bearing device is a pressure vessel 1 with a detachable cover plate, which is forged from 42crmo at one time to ensure a sufficient pressure bearing level. The pressure-bearing device is driven by the motor to rotate at high speed, and the speed can be adjusted through the frequency converter to simulate the rotation of the tire at the corresponding speed. A quick-install fixture structure is arranged inside the pressure container 1, which is convenient for installing and fixing the tested sample. All components of the device are calibrated through dynamic balance to ensure smooth and reliable operation at high speed.

2. Dynamic inflation and deflation device.

As shown in Figure 2, each simulated tire is independently installed on the front end of a cantilever shaft 7, and through the design of the through hole in the shaft center, the interior of the simulated tire is connected with the air chamber 4 located in the middle section of the cantilever shaft 7, and the air chamber 4 is formed by the cantilever shaft. 7 The outer surface, the inner surface of the supporting shell 5 and two sealing rings 3 installed coaxially and separated by a certain distance, are provided with air inlet and outlet ports, connected with the pressurization system, and realize the inflation or inflation of simulated tires under high-speed rotation. Deflation. Pressure transmitters and air valves are respectively installed at the air inlet and outlet of the air chamber 4. The pressure of the air inlet and outlet is sensed by the pressure transmitter, and the air pressure is controlled by the PLC to control the opening of the air valve to realize the precise control of the internal pressure of the simulated tire and the pressure adjustment accuracy. up to 1kPa. The support housing 5 is fixed in the bracket 8 , and the bracket 8 and the cantilever rotating shaft 7 are connected through a bearing 6 .

3. Dynamic water/air linkage sealing device.

As shown in Figure 2, since the maximum air pressure inside the simulated tire needs to reach 2.0MPa, and it needs to be inflated and deflated under high-speed operation, a very high dynamic air sealing effect is required. In order to prevent the high-pressure sealing device from generating a large amount of heat during high-speed operation, burning the sealing device or even the main shaft, this system designs a coaxial water/air sealing structure, that is, the outer parts of the left and right sealing rings 3 of the air chamber 4 of the rotating shaft A water-tight ring is provided to add a water-tight chamber 2 to the outside of the air chamber 4. On the one hand, it plays the role of cooling, and on the other hand, it also balances the force on both sides of the air-pressure sealing ring, greatly improving the sealing effect of the air chamber. When the equipment is in operation, the watertight chamber 2 is firstly filled with water by the water pump, so that the watertight chamber 2 is filled with water to achieve sealing and cooling, and then the air chamber 4 is inflated and deflated. The water in the watertight chamber 2 is circulated through the circulating cooling system.

4. Rotary drive device.

The rotating shaft of the simulated tire is driven by the motor, and the motor speed is controlled by PLC and frequency converter to realize the infinitely variable speed of the tire. According to the preset program, the corresponding tire speed of different models and different driving speeds is simulated. The rotating shaft of each tire is driven and controlled by an independent motor and frequency converter, which can simulate the speed difference effect of a real vehicle when a certain tire pressure changes, and realize the detection of the indirect TPMS function.

5. Data acquisition processing and control system, including the above-mentioned pressure transmitter and air valve, as well as PC and PLC control system, as shown in Figure 3, the PC and PLC control system are respectively connected to the pressure transmitter, air valve, frequency converter and The display screen outputs level signals to the upper computer.

The PC and PLC control system consists of operation monitoring software, operation controller, data acquisition system and servo controller, which can realize dynamic control of actuators.

(1) Operation monitoring software: The operation monitoring software can run in wplsoft3.06 or above, has a friendly man-machine interface, can choose to monitor the dynamic operation of the pressure plate and brake parts, and can adjust the test conditions and operating parameters according to the needs. A self-programming run window is reserved.

(2) The response speed of the operation controller is 20m/s, the high-speed pulse is not less than 200k, the host has 24 digital points, and built-in 12bit.

(3) The data acquisition system has two channels and is equipped with an RS 485 interface to realize redundant control of the system and increase the reliability of system communication; the communication protocol adopts TCP/IP protocol, and the system has a self-recovery diagnosis function when the communication is interrupted .

6. Safety protection device.

In order to ensure the stability and reliability of the system, high-reliability devices are selected for the electrical part, and low-voltage soft start is adopted; the system is equipped with an on-site control box for manual intervention, including alarm and emergency stop. Due to the high gas pressure, the system has set up an automatic protection program for water/gas linkage sealing, and the air chamber can only be pressurized after the water-tight chamber is filled with water to ensure the safety of the sealing structure; the pneumatic circuit adopts copper pipes, stainless steel joints, etc. The pressure material is connected with the solenoid valve, and equipped with a safety valve to control the pressure of the gas outflow, so as to achieve the purpose of safety.

Claims (7)

1. A bench test system for simulating the rotation of automobile tires and the change of internal air pressure, which is characterized in that it includes: a rotating pressure-bearing device, an inflation and deflation device, a water-air linkage sealing device, a rotating drive device, a data acquisition and processing and control system, The main structure of the rotating pressure-bearing device is a pressure-bearing container (1) with a detachable cover plate. The rotating pressure-bearing device is driven by a rotating drive device to rotate at a high speed and adjust the speed to simulate the rotation of the tire at the corresponding vehicle speed; The inflation and deflation device includes a cantilever shaft (7), a support housing (5) and a pressurization system. Each rotating pressure-bearing device is independently installed on the front end of a cantilever shaft (7), and rotates through the through hole of the shaft center. The interior of the pressure-bearing device is connected to the air chamber (4) located in the middle section of the cantilever shaft (7). It is composed of sealing rings (3) separated by a certain distance, and the air chamber (4) is provided with air inlet and outlet ports, which are connected with the pressurization system to realize the inflation or deflation of the rotating pressure-bearing device under high-speed rotation; The water-air interlocking sealing device includes: a watertight chamber (2) is arranged on both sides of the air chamber (4), and the watertight chamber (2) is composed of the outer surface of the cantilever shaft (7), the inner surface of the supporting shell (5) and The sealing ring (3) constitutes; The data collection, processing and control system includes: a pressure transmitter and an air valve are respectively installed at the inlet and outlet of the air chamber (4), and the pressure of the inlet and outlet is sensed by the pressure transmitter, and the opening of the air valve is controlled by PLC to adjust Air pressure: first, the rotary drive device is controlled by the PLC to adjust the speed of the rotary pressure-bearing device, and when the rotary pressure-bearing device is running at high speed, the preset program or manual control method is used to realize the pressure through PLC, pressure transmitter and air valve. The internal inflation and deflation of the rotating pressure-bearing device can accurately control and adjust the internal air pressure, and simulate the tire rotation and internal pressure environment of the car under high-speed motion. 2. The bench test system for simulating the rotation of automobile tires and the variation of internal air pressure according to claim 1, wherein the simulated state includes situations where the automobile is under-inflated, the tire pressure is too high, and the tire leaks rapidly . 3. The bench test system for simulating the rotation of automobile tires and the change of internal air pressure according to claim 1, characterized in that, when the equipment is running, the watertight chamber (2) is first filled with water so that the watertight chamber (2) is filled with water Carry out inflation and deflation again to air chamber (4) afterwards. 4. The bench test system for simulating the rotation of automobile tires and the change of internal air pressure according to claim 1, characterized in that the water in the watertight chamber (2) is circulated through a circulating cooling system. 5. The bench test system for simulating the rotation of automobile tires and the variation of internal air pressure according to claim 1, characterized in that the rotational speed of the simulated tires is swept according to the road data of different models. 6. The bench test system for simulating the rotation of automobile tires and the change of internal air pressure according to claim 1, characterized in that, the rotary drive device includes a motor and a frequency converter connected to each other, the frequency converter is connected to a PLC, and the cantilever shaft (7) Driven by the motor, the motor speed is controlled by PLC and frequency converter to realize the stepless speed change of the rotating pressure-bearing device. According to the preset program, the corresponding tire speed of different models and different driving speeds is simulated; the cantilever corresponding to each rotating pressure-bearing device The rotating shafts (7) are driven and controlled by independent motors and frequency converters, which can simulate the speed difference effect of real vehicles when individual tire pressure changes, and realize the function detection of the indirect tire pressure monitoring system. 7. The bench test system for simulating the rotation of automobile tires and the change of internal air pressure according to claim 1, characterized in that, a quick-installation fixture is arranged inside the pressure-bearing container (1) for installing and fixing the tested sample.