A Rotating Mechanism for a Tire Pressure Monitoring System and an Electromagnetic Compatibility Testing Method

Abstract

The present invention provides a rotating mechanism and an electromagnetic compatibility test method for a tire pressure monitoring system, including an air pump and a support structure; an air motor and a coupling are arranged inside the support structure, a bearing is arranged on the surface of the support structure, a rotating base is arranged above the support structure, and a pressure tank is arranged on the upper surface of the rotating base, and a tire pressure monitoring sensor is arranged inside the pressure tank; the exhaust port of the air pump is connected to the air inlet of the air motor, the output shaft of the air motor is connected to one end of the coupling, and the other end of the coupling is connected to one end of the base rotating shaft. The rotating mechanism and the electromagnetic compatibility test method for the tire pressure monitoring system of the present invention can perform the electromagnetic compatibility test of the tire pressure monitoring system in a simulated driving state, and have the characteristics of accurate test effect, sufficient test and convenient operation.

Description

Technical Field

[0001] The present invention belongs to the field of automotive electronic electromagnetic compatibility testing, and particularly relates to a rotating mechanism and an electromagnetic compatibility testing method for a tire pressure monitoring system. Background Art

[0002] The direct tire pressure monitoring system uses pressure sensors installed inside the tires to measure the tire status, and uses wireless transmitters to send pressure information from the inside of the tires to external receivers. This system can achieve automatic monitoring of tire pressure and temperature during vehicle stationary or driving, and alarm for abnormal tire status, which plays an important role in reducing the traffic accident rate and ensuring driving safety. Under the existing technical conditions, as one of the important in-vehicle systems, the performance assessment of the tire pressure monitoring system has been included in the requirements of automotive product announcements and 3C, and the relevant standard is GB 26149-2017. The electromagnetic compatibility of the tire pressure monitoring system defined in this standard should comply with the requirements for electrical / electronic components in ECE R10, but the operating status of the pressure sensors of the direct tire pressure monitoring system is not clearly specified. Due to the differences in vehicle stationary and driving states, the testing of the direct tire pressure monitoring system should also include stationary state testing and testing of simulated driving states. Among them, the stationary state testing can be carried out with reference to the testing of low-voltage electronic components, but there is no reliable method for the electromagnetic compatibility testing of the tire pressure monitoring system in the simulated driving state. Summary of the Invention

[0003] In view of this, the present invention aims to provide a rotating mechanism and an electromagnetic compatibility testing method for a tire pressure monitoring system, which can perform electromagnetic compatibility testing of the tire pressure monitoring system in a simulated driving state, and has the characteristics of accurate testing effect, sufficient testing and convenient operation.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows:

[0005] A rotating mechanism for a tire pressure monitoring system includes an air pump and a support structure; an air motor and a coupling are arranged inside the support structure, a bearing is arranged on the surface of the support structure, a rotating base is arranged above the support structure, a pressure tank is arranged on the upper surface of the rotating base, and a tire pressure monitoring sensor is arranged inside the pressure tank; the exhaust port of the air pump is connected to the air inlet of the air motor, the output shaft of the air motor is connected to one end of the coupling, the other end of the coupling is connected to one end of the base rotating shaft, the other end of the base rotating shaft passes through the bearing and is fixedly connected to the center of the rotating base, and an air inlet interface and an exhaust interface are arranged on the upper surface of the pressure tank.

[0006] Further, a pressure gauge is arranged on the pressure tank.

[0007] An electromagnetic compatibility testing method for a tire pressure monitoring system uses the above rotating mechanism to perform radiation emission testing of the tire pressure monitoring system:

[0008] Set up a ground plane, an antenna, a receiver and a rotating mechanism in an anechoic chamber. An LISN device and a tire pressure monitoring receiver are provided on the ground plane; gas is injected into the pressure tank of the rotating mechanism to simulate the air pressure in the tire, and the pneumatic motor drives the rotating base to rotate to simulate the driving state of the wheel. Data is transmitted wirelessly between the tire pressure monitoring receiver and the tire pressure monitoring sensor. The low-voltage power supply supplies power to the tire pressure monitoring receiver through the LISN device. The receiver is connected to the antenna to test the radiated emissions of the tire pressure monitoring receiver in the frequency band from 30 MHz to 1000 MHz. The antenna phase center should be directly opposite the middle position of the low-voltage wire harness connecting the LISN device and the tire pressure monitoring receiver.

[0009] Conduct a large current injection radiated immunity test:

[0010] Set up a ground plane, a current injection probe, a signal source and a rotating mechanism in an anechoic chamber. An LISN device, an insulating support and a tire pressure monitoring receiver are provided on the ground plane; gas is injected into the pressure tank of the rotating mechanism to simulate the air pressure in the tire, and the pneumatic motor drives the rotating base to rotate to simulate the driving state of the wheel. Data is transmitted wirelessly between the tire pressure monitoring receiver and the tire pressure monitoring sensor. The low-voltage power supply supplies power to the tire pressure monitoring receiver through the LISN device. The current injection probe is set on the insulating support, and the distance between the current injection probe and the tire pressure monitoring receiver is 150 mm. The current injection probe is connected to the signal source, and an AM modulation signal of 20 MHz to 200 MHz is applied. The test level is 60 mA to test the radiated immunity performance of the tire pressure monitoring receiver.

[0011] Conduct an anechoic chamber radiated immunity test:

[0012] Set up a ground plane, an antenna, a signal source and a rotating mechanism in an anechoic chamber. An LISN device and a tire pressure monitoring receiver are provided on the ground plane; gas is injected into the pressure tank of the rotating mechanism to simulate the air pressure in the tire, and the pneumatic motor drives the rotating base to rotate to simulate the driving state of the wheel. Data is transmitted wirelessly between the tire pressure monitoring receiver and the tire pressure monitoring sensor. The low-voltage power supply supplies power to the tire pressure monitoring receiver through the LISN device. The signal source conducts a radiated immunity test on the tire pressure monitoring receiver through the antenna. The test frequency band is from 20 MHz to 2000 MHz, and the test field strength is 30 V / m. When the test frequency is not greater than 1000 MHz, the antenna phase center should be directly opposite the middle position of the low-voltage wire harness connecting the LISN device and the tire pressure monitoring receiver. When the test frequency is greater than 1000 MHz, the antenna phase center should be directly opposite the center of the tire pressure monitoring receiver.

[0013] Conduct an electrical transient conducted emission test:

[0014] An insulating support, a LISN device, a power supply and an oscilloscope are arranged on a grounding plate; a tire pressure monitoring receiver is arranged on the insulating support, gas is injected into the pressure tank of the rotating mechanism to simulate the air pressure in the tire, the pneumatic motor drives the rotating base to rotate to simulate the driving state of the wheel, data is transmitted wirelessly between the tire pressure monitoring receiver and the tire pressure monitoring sensor, the power supply supplies power to the tire pressure monitoring receiver through the LISN device, and the oscilloscope is connected to the LISN device for electro-transient conducted emission testing.

[0015] Conduct electro-transient conducted immunity testing:

[0016] An insulating support and an electrical disturbance testing system are arranged on a grounding plate; a tire pressure monitoring receiver is arranged on the insulating support, gas is injected into the pressure tank of the rotating mechanism to simulate the air pressure in the tire, the pneumatic motor drives the rotating base to rotate to simulate the driving state of the wheel, data is transmitted wirelessly between the tire pressure monitoring receiver and the tire pressure monitoring sensor, the output end of the electrical disturbance testing system is connected to the power supply end of the tire pressure monitoring receiver, and pulse waveforms are generated by the electrical disturbance testing system to simulate transient phenomena such as the disconnection of the power supply from the inductive load and current interruption, and electro-transient conducted immunity testing is carried out on the tire pressure monitoring receiver.

[0017] Compared with the prior art, a rotating mechanism and an electromagnetic compatibility testing method for a tire pressure monitoring system according to the present invention have the following advantages:

[0018] A rotating mechanism and an electromagnetic compatibility testing method for a tire pressure monitoring system according to the present invention can carry out electromagnetic compatibility testing on a tire pressure monitoring system in a simulated driving state, and have the characteristics of accurate testing effect, sufficient testing and convenient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0020] In the drawings:

[0021] Figure 1 is a schematic diagram of a rotating mechanism for a tire pressure monitoring system according to an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of a tire pressure monitoring system radiation emission test in an electromagnetic compatibility testing method for a tire pressure monitoring system according to an embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a large current injection radiation immunity test in an electromagnetic compatibility testing method for a tire pressure monitoring system according to an embodiment of the present invention;

[0024] Figure 4Schematic diagram of radiated immunity test in an anechoic chamber for an electromagnetic compatibility test method for a tire pressure monitoring system according to an embodiment of the present invention;

[0025] Figure 5 Schematic diagram of conducted emission test of electrical transients for an electromagnetic compatibility test method for a tire pressure monitoring system according to an embodiment of the present invention;

[0026] Figure 6 Schematic diagram of conducted immunity test of electrical transients for an electromagnetic compatibility test method for a tire pressure monitoring system according to an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1 - air pump; 2 - support structure; 3 - pneumatic motor; 4 - coupling; 5 - bearing; 6 - rotating base; 7 - tire pressure monitoring sensor; 8 - pressure tank; 9 - pressure gauge; 10 - air inlet interface; 11 - exhaust interface; 12 - anechoic chamber; 13 - ground plane; 14 - LISN device; 15 - tire pressure monitoring receiver; 16 - antenna; 17 - receiver; 18 - current injection probe; 19 - insulating support; 20 - signal source; 21 - power supply; 22 - oscilloscope; 23 - electrical disturbance test system. Detailed implementation manners

[0029] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0031] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0033] As Figure 1 shown, a rotating mechanism for a tire pressure monitoring system includes an air pump 1 and a support structure 2; an air motor 3 and a coupling 4 are provided inside the support structure 2, a bearing 5 is provided on the surface of the support structure 2, a rotating base 6 is provided above the support structure 2, a pressure tank 8 is provided on the upper surface of the rotating base 6, and a tire pressure monitoring sensor 7 is provided inside the pressure tank 8; the exhaust port of the air pump 1 is connected to the intake port of the air motor 3, the output shaft of the air motor 3 is connected to one end of the coupling 4, the other end of the coupling 4 is connected to one end of the base rotating shaft, and the other end of the base rotating shaft passes through the bearing 5 and is fixedly connected to the center of the rotating base 6. An intake interface 10 and an exhaust interface 11 are provided on the upper surface of the pressure tank 8.

[0034] As Figure 1 shown, a pressure gauge 9 is provided on the pressure tank 8.

[0035] An electromagnetic compatibility test method for a tire pressure monitoring system uses the above rotating mechanism.

[0036] As Figure 1 and Figure 2 shown, a radiation emission test of the tire pressure monitoring system is carried out:

[0037] A ground plane 13, an antenna 16, a receiver 17, and a rotating mechanism are arranged in an anechoic chamber 12. An LISN device 14 and a tire pressure monitoring receiver 15 are provided on the ground plane 13; gas is injected into the pressure tank 8 of the rotating mechanism to simulate the air pressure in the tire, the air motor 3 drives the rotating base 6 to rotate to simulate the driving state of the wheel, data is transmitted wirelessly between the tire pressure monitoring receiver 15 and the tire pressure monitoring sensor 7, a low-voltage power supply supplies power to the tire pressure monitoring receiver 15 through the LISN device 14, and the receiver 17 is connected to the antenna 16 to test the radiation emission of the tire pressure monitoring receiver 15 in the frequency band of 30 MHz to 1000 MHz. The phase center of the antenna 16 should be directly opposite to the middle position of the low-voltage wire harness connecting the LISN device 14 and the tire pressure monitoring receiver 15.

[0038] As Figure 1 and Figure 3As shown, a high-current injection radiation immunity test is carried out:

[0039] In the anechoic chamber 12, a ground plane 13, a current injection probe 18, a signal source 20 and a rotating mechanism are arranged. An LISN device 14, an insulating support 19 and a tire pressure monitoring receiver 15 are provided on the ground plane 13. Gas is injected into the pressure tank 8 of the rotating mechanism to simulate the air pressure in the tire. The pneumatic motor 3 drives the rotating base 6 to rotate to simulate the driving state of the wheel. Data is wirelessly transmitted between the tire pressure monitoring receiver 15 and the tire pressure monitoring sensor 7. The low-voltage power supply supplies power to the tire pressure monitoring receiver 15 through the LISN device 14. The current injection probe 18 is arranged on the insulating support 19. The distance between the current injection probe 18 and the tire pressure monitoring receiver 15 is 150 mm. The current injection probe 18 is connected to the signal source 20. An AM modulation signal of 20 MHz to 200 MHz is applied. The test level is 60 mA. The radiation immunity performance of the tire pressure monitoring receiver 15 is tested.

[0040] As Figure 1 and Figure 4 As shown, an anechoic chamber radiation immunity test is carried out:

[0041] In the anechoic chamber 12, a ground plane 13, an antenna 16, a signal source 20 and a rotating mechanism are arranged. An LISN device 14 and a tire pressure monitoring receiver 15 are provided on the ground plane 13. Gas is injected into the pressure tank 8 of the rotating mechanism to simulate the air pressure in the tire. The pneumatic motor 3 drives the rotating base 6 to rotate to simulate the driving state of the wheel. Data is wirelessly transmitted between the tire pressure monitoring receiver 15 and the tire pressure monitoring sensor 7. The low-voltage power supply supplies power to the tire pressure monitoring receiver 15 through the LISN device 14. The signal source 20 performs an immunity test on the tire pressure monitoring receiver 15 through the antenna 16. The test frequency band is 20 MHz to 2000 MHz. The test field strength is 30 V / m. When the test frequency is not greater than 1000 MHz, the phase center of the antenna 16 should be directly opposite the middle position of the low-voltage wire harness connecting the LISN device 14 and the tire pressure monitoring receiver 15. When the test frequency is greater than 1000 MHz, the phase center of the antenna 16 should be directly opposite the center of the tire pressure monitoring receiver 15.

[0042] As Figure 1 and Figure 5 As shown, an electrical transient conduction emission test is carried out:

[0043] An insulating support 19, a LISN device 14, a power supply 21 and an oscilloscope are arranged on a grounding plate 13; a tire pressure monitoring receiver 15 is arranged on the insulating support 19, a gas is injected into a pressure tank 8 of a rotating mechanism to simulate the air pressure in a tire, a pneumatic motor 3 drives a rotating base 6 to rotate to simulate the running state of a wheel, data is transmitted wirelessly between the tire pressure monitoring receiver 15 and a tire pressure monitoring sensor 7, the power supply 21 supplies power to the tire pressure monitoring receiver 15 through the LISN device 14, and the oscilloscope is connected to the LISN device 14 to conduct an electrical transient conduction emission test.

[0044] As Figure 1 and Figure 6 shown, an electrical transient conduction immunity test is carried out:

[0045] An insulating support 19 and an electrical disturbance test system are arranged on the grounding plate 13; a tire pressure monitoring receiver 15 is arranged on the insulating support 19, a gas is injected into a pressure tank 8 of a rotating mechanism to simulate the air pressure in a tire, a pneumatic motor 3 drives a rotating base 6 to rotate to simulate the running state of a wheel, data is transmitted wirelessly between the tire pressure monitoring receiver 15 and a tire pressure monitoring sensor 7, the output end of the electrical disturbance test system is connected to the power supply end of the tire pressure monitoring receiver 15, and a pulse waveform is generated by the electrical disturbance test system to simulate transient phenomena such as the disconnection of a power supply from an inductive load and the interruption of current, so as to conduct an electrical transient conduction immunity test on the tire pressure monitoring receiver 15.

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electromagnetic compatibility test method for a tire pressure monitoring system, characterized in that, the tire pressure monitoring system includes a rotating mechanism, and the rotating mechanism includes: an air pump (1) and a support structure (2); an air motor (3) and a coupling (4) are arranged inside the support structure (2), a bearing (5) is arranged on the surface of the support structure (2), a rotating base (6) is arranged above the support structure (2), a pressure tank (8) is arranged on the upper surface of the rotating base (6), and a tire pressure monitoring sensor (7) is arranged inside the pressure tank (8); the exhaust port of the air pump (1) is connected to the air inlet of the air motor (3), the output shaft of the air motor (3) is connected to one end of the coupling (4), the other end of the coupling (4) is connected to one end of the base rotating shaft, the other end of the base rotating shaft passes through the bearing (5) and is fixedly connected to the center of the rotating base (6), and an air inlet interface (10) and an exhaust interface (11) are arranged on the upper surface of the pressure tank (8); the electromagnetic compatibility test for the tire pressure monitoring system includes the radiation emission test of the tire pressure monitoring system, and the radiation emission test of the tire pressure monitoring system includes: setting a ground plane (13), an antenna (16), a receiver (17) and a rotating mechanism in an anechoic chamber (12), and arranging an LISN device (14) and a tire pressure monitoring receiver (15) on the ground plane (13); injecting gas into the pressure tank (8) of the rotating mechanism to simulate the air pressure in the tire, driving the rotating base (6) to rotate by the air motor (3) to simulate the driving state of the wheel, transmitting data wirelessly between the tire pressure monitoring receiver (15) and the tire pressure monitoring sensor (7), supplying power to the tire pressure monitoring receiver (15) by a low-voltage power supply through the LISN device (14), connecting the receiver (17) to the antenna (16) to test the radiation emission of the tire pressure monitoring receiver (15) in the frequency band of 30 MHz to 1000 MHz, and the phase center of the antenna (16) should be directly opposite to the middle position of the low-voltage wire harness connecting the LISN device (14) and the tire pressure monitoring receiver (15); the electromagnetic compatibility test for the tire pressure monitoring system includes the large current injection radiation immunity test, and the large current injection radiation immunity test includes: setting a ground plane (13), a current injection probe (18), a signal source (20) and a rotating mechanism in an anechoic chamber (12), and arranging an LISN device (14), an insulating support (19) and a tire pressure monitoring receiver (15) on the ground plane (13); injecting gas into the pressure tank (8) of the rotating mechanism to simulate the air pressure in the tire, driving the rotating base (6) to rotate by the air motor (3) to simulate the driving state of the wheel, transmitting data wirelessly between the tire pressure monitoring receiver (15) and the tire pressure monitoring sensor (7), supplying power to the tire pressure monitoring receiver (15) by a low-voltage power supply through the LISN device (14), arranging the current injection probe (18) on the insulating support (19), connecting the current injection probe (18) to the signal source (20), applying an AM modulation signal, and testing the radiation immunity performance of the tire pressure monitoring receiver (15); The electromagnetic compatibility test for the tire pressure monitoring system includes the radiated immunity test in an anechoic chamber, and the radiated immunity test in the anechoic chamber includes: An earth plate (13), an antenna (16), a signal source (20) and a rotating mechanism are arranged in an anechoic chamber (12). An LISN device (14) and a tire pressure monitoring receiver (15) are arranged on the earth plate (13); gas is injected into a pressure tank (8) of the rotating mechanism to simulate the air pressure in a tire, and a pneumatic motor (3) drives a rotating base (6) to rotate to simulate the driving state of a wheel. Data is wirelessly transmitted between the tire pressure monitoring receiver (15) and a tire pressure monitoring sensor (7). A low-voltage power supply supplies power to the tire pressure monitoring receiver (15) through the LISN device (14), and the signal source (20) performs a radiated immunity test on the tire pressure monitoring receiver (15) through the antenna (16).

2. The electromagnetic compatibility test method for a tire pressure monitoring system according to claim 1, characterized in that: A pressure gauge (9) is arranged on the pressure tank (8).

Images