Interference injection system for automobile driving test

Abstract

The invention provides an interference injection system for an automobile driving test, which comprises a test platform, an uphill plate, a downhill plate, a light-transmitting plate and an identification arrangement mechanism, and is characterized in that the identification arrangement mechanism comprises a lifting plate, an electric push rod, magnetorheological fluid, an electromagnetic coil, a reserve adjusting mechanism and a main control unit; and the main control unit can control the electromagnetic coils at different positions in the lifting plate to be electrified through the upper part of the light-transmitting plate, and the road sign is formed after the magnetorheological fluid at the upper part is gathered through the generated magnetic field, so that the identification capability of the automobile on the road sign can be tested, and the main control unit can test the identification capability of the automobile on the road sign by regulating and controlling the electrification of the electromagnetic coils. According to the invention, instantaneous switching of road sign interference is realized, and after the storage amount of the magnetorheological fluid is adjusted through the storage amount adjusting mechanism, the color of the road sign can be lightened when the road sign is generated, and the road sign worn by an external environment on a real road can be simulated, so that the performance of an automobile can be tested in an omnibearing manner.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile testing, in particular to an interference injection system for automobile driving test. BACKGROUND

[0002] With the rapid iteration of intelligent networked vehicles and automatic driving technology, the complexity and rigor of automobile driving test have significantly improved, and the functional safety of the automatic driving system directly determines the vehicle driving safety. As one of the core input information of the automatic driving visual perception system, the dynamic change of the road marking poses a key test to the robustness of the system decision logic. Currently, automobile driving test needs to cover multiple scenarios such as urban roads, highways, and complex weather conditions, and it is particularly necessary to simulate various abnormal states of road markings to verify the recognition accuracy and emergency response capability of the automatic driving system under non-ideal road conditions. For example, sudden marking changes, partial damage, or discoloration may all lead to system misjudgment, causing lane deviation, rear-end collision, and other risks. Therefore, the authenticity and flexibility of road marking interference injection are increasingly urgent.

[0003] In existing automobile driving tests, the interference injection means related to road markings has significant limitations. Conventional schemes mostly use fixed physical markings or mechanical marking plate changing devices. The former realizes basic scenario simulation by laying pre-made lane lines, arrows, and other physical markings in the test site, but the marking type and state are fixed, and only single interference can be provided, which cannot dynamically switch the marking function. The latter can change different marking plates through mechanical structures, but the switching process relies on manual operation or complex rotary motor driving, and the switching period is as long as tens of seconds to minutes, which is difficult to reproduce the sudden scenarios of instantaneous marking changes in real roads.

[0004] In addition, the existing technology cannot simulate the aging and damage state of road markings in natural environment. In real roads, markings are affected by factors such as vehicle crushing, rain erosion, and ultraviolet radiation, and are prone to edge wear and blur, overall discoloration, and partial loss. These states pose higher requirements on the recognition ability of automatic driving visual sensors. However, current test schemes can only simulate such scenarios by pre-producing aging marking plates, which not only has high production cost and long cycle, but also cannot accurately control the wear degree and range, resulting in a disconnection between the test scenario and the real road conditions, and the inability to effectively verify the reliability of the automatic driving system under low-quality marking input, which restricts the comprehensiveness and effectiveness of the driving test. SUMMARY

[0005] In view of this, the present application provides an interference injection system for automobile driving test, which can simulate different road markings and different states of the road, realize automatic injection of interference, and improve the accuracy and comprehensiveness of automobile driving test.

[0006] The technical scheme of the present application is implemented as follows: An interference injection system for automobile driving test, comprising a test platform, an uphill plate, a downhill plate, a light-transmitting plate and a sign arrangement mechanism, the test platform is located on the driving path of the automobile, the uphill plate and the downhill plate are arranged on both sides of the test platform, the test platform is provided with an interference cavity, and the light-transmitting plate is located on the top surface of the interference cavity; the sign arrangement mechanism comprises a lifting plate, an electric push rod, a magnetorheological fluid, an electromagnetic coil, a storage adjusting mechanism and a master control unit, the lifting plate is arranged in the interference cavity, the electric push rod is arranged on the bottom surface of the interference cavity, the output shaft of the electric push rod is connected with the bottom surface of the lifting plate, the magnetorheological fluid is located between the lifting plate and the light-transmitting plate, the electromagnetic coil is arranged in the lifting plate in an array mode, the storage adjusting mechanism is arranged in the test platform and is used for adjusting the storage of the magnetorheological fluid in the interference cavity, and the master control unit is arranged on the bottom surface of the lifting plate and is electrically connected with the electric push rod, the electromagnetic coil and the storage adjusting mechanism respectively; the master control unit generates a magnetic field by driving the electromagnetic coils at different positions to make the magnetorheological fluid gather to form a road sign.

[0007] Preferably, the sign arrangement mechanism further comprises a sealing rubber ring, the sealing rubber ring is arranged on the side wall of the lifting plate and is tightly arranged with the inner wall of the interference cavity.

[0008] Preferably, the road sign comprises lane lines, turning arrows and text signs.

[0009] Preferably, the master control unit generates magnetic fields with different intensities by driving the electromagnetic coils at different positions to make the magnetorheological fluid gather to form a road sign which appears to gradually change and / or be missing.

[0010] Preferably, the storage adjusting mechanism comprises a transition box, a liquid pump, a feeding pipe, a discharging pipe and a valve, the transition box is arranged in the test platform, the liquid pumps are arranged on both sides of the transition box, the bottom end of the feeding pipe is connected with one of the liquid pumps, the top end of the feeding pipe is connected with the side wall of the interference cavity and is located above the lifting plate, one end of the discharging pipe is connected with the other liquid pump, the other end of the discharging pipe extends into the interference cavity and penetrates through the lifting plate, the valve is arranged on the part of the discharging pipe located in the lifting plate and on the top end of the feeding pipe, and the master control unit is electrically connected with the liquid pumps and the valve respectively.

[0011] Preferably, further comprising a mounting frame, an electrically controlled spray head, an illuminating lamp and a water pipe, the mounting frame is horizontally arranged above the test platform, the electrically controlled spray head and the illuminating lamp are arranged on the mounting frame, the water pipe is connected with the electrically controlled spray head and a water source, and the master control unit is electrically connected with the electrically controlled spray head and the illuminating lamp.

[0012] Preferably, the identification arrangement mechanism further comprises a storage tank, an inert gas, a gas pump and a gas pipe, the storage tank is arranged in the test platform and above the transition tank, the inert gas is filled in the storage tank, the gas pump is arranged on the side wall of the storage tank, one end of the gas pipe is connected with the gas pump and the other end is connected with the top surface of the transition tank, and the main control unit is electrically connected with the gas pump.

[0013] Preferably, the identification arrangement mechanism further comprises a rotary motor, a stirring shaft and stirring blades, the rotary motor is arranged on the inner top surface of the transition tank, the output shaft of the rotary motor is connected with the top end of the stirring shaft, and the stirring blades are arranged on the outer wall of the stirring shaft.

[0014] Preferably, the identification arrangement mechanism further comprises a bearing, the bearing is arranged on the inner bottom surface of the transition tank, and the bottom end of the stirring shaft is connected with the bearing.

[0015] Preferably, the identification arrangement mechanism further comprises a flow guide plate, and the flow guide plates are arranged on the inner wall of the gas pipe in a cross manner.

[0016] Compared with the prior art, the identification arrangement mechanism has the following beneficial effects: ①The test platform is located on the driving path of the to-be-tested automobile, the to-be-tested automobile can enter or leave the test platform through the uphill plate and the downhill plate, the light-transmitting plate is arranged on the surface of the test platform, and the to-be-tested automobile can identify the identification below the light-transmitting plate to make a decision when the to-be-tested automobile is tested in an automatic driving mode; the electromagnetic coils at different positions can be controlled to be electrified to generate a magnetic field, so that the magnetorheological fluid is gathered at the position of the magnetic field, thereby forming a clear road identification for the to-be-tested automobile to identify; in addition, since the electromagnetic coils are arranged in an array in the lifting plate, the electromagnetic coils at different positions can be controlled to be electrified to form different road identifications, without the need for manual switching, and the switching speed is relatively fast, so that the instantaneous transformation of the road identification can be simulated, thereby evaluating the identification and decision-making performance of the to-be-tested automobile. ②The lifting plate is arranged in the interference cavity, the electric push rod can drive the lifting plate to rise, so as to adjust the space size between the lifting plate and the light-transmitting plate; the storage adjusting mechanism can be used to adjust the storage of the magnetorheological fluid above the lifting plate; when the storage is small, the magnetic field generated by the electromagnetic coils after being electrified can magnetically attract and gather the magnetorheological fluid, and the color of the road identification generated will be lighter, which is used to simulate the road identification that appears to be aged or worn after being affected by the external environment for a long time, so as to evaluate the identification ability of the to-be-tested automobile to this type of road identification; when the to-be-tested automobile passes above the light-transmitting plate, different types and states of road identification interference can be injected by controlling the electromagnetic coils, so as to comprehensively evaluate the automatic driving performance of the to-be-tested automobile. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only the preferred embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0018] Fig. 1 A structural schematic diagram of an interference injection system for automobile driving test according to the present application; Fig. 2 An internal structural schematic diagram of a test platform of an interference injection system for automobile driving test according to the present application; Fig. 3 A structural schematic diagram of an electromagnetic coil of an interference injection system for automobile driving test according to the present application, which is located in a lifting plate; Fig. 4 An internal structural schematic diagram of a gas conveying pipe of an interference injection system for automobile driving test according to the present application; In the drawings, 1 is a test platform, 2 is an uphill plate, 3 is a downhill plate, 4 is a light transmission plate, 5 is an interference cavity, 6 is a lifting plate, 7 is an electric push rod, 8 is a magnetorheological fluid, 9 is an electromagnetic coil, 10 is a main control unit, 11 is a sealing rubber ring, 12 is a transition box, 13 is a liquid pump, 14 is a feeding pipe, 15 is a discharging pipe, 16 is a valve, 17 is a mounting frame body, 18 is an electrically controlled nozzle, 19 is an illuminating lamp, 20 is a water pipe, 21 is a storage box, 22 is an inert gas, 23 is a gas pump, 24 is a gas conveying pipe, 25 is a rotating motor, 26 is a stirring shaft, 27 is a stirring blade, 28 is a bearing, and 29 is a guide plate. DETAILED DESCRIPTION

[0019] In order to better understand the technical content of the present application, a specific embodiment is provided below, and the present application is further described in combination with the drawings.

[0020] Reference Figs. 1 to 4The application provides a disturbance injection system for automobile driving test, which comprises a test platform 1, an uphill plate 2, a downhill plate 3, a light transmission plate 4 and a mark arrangement mechanism, the test platform 1 is located on the driving path of the automobile, the uphill plate 2 and the downhill plate 3 are arranged on the two sides of the test platform 1, the test platform 1 is provided with a disturbance cavity 5, and the light transmission plate 4 is located on the top surface of the disturbance cavity 5; the mark arrangement mechanism comprises a lifting plate 6, an electric push rod 7, a magnetorheological fluid 8, an electromagnetic coil 9, a storage adjusting mechanism and a master control unit 10, the lifting plate 6 is arranged in the disturbance cavity 5, the electric push rod 7 is arranged on the bottom surface of the disturbance cavity 5, the output shaft of the electric push rod 7 is connected with the bottom surface of the lifting plate 6, the magnetorheological fluid 8 is located between the lifting plate 6 and the light transmission plate 4, the electromagnetic coil 9 is arranged in the lifting plate 6 in an array mode, the storage adjusting mechanism is arranged in the test platform 1 and used for adjusting the storage of the magnetorheological fluid 8 in the disturbance cavity 5, and the master control unit 10 is arranged on the bottom surface of the lifting plate 6 and electrically connected with the electric push rod 7, the electromagnetic coil 9 and the storage adjusting mechanism respectively, and the master control unit 10 generates a magnetic field by driving the electromagnetic coil 9 at different positions to make the magnetorheological fluid 8 gather to form a road mark.

[0021] In the automatic driving test of the automobile, the automobile needs to test the coping strategy when coping with various emergencies and disturbances, which includes that the automobile identifies the suddenly changed mark or the worn mark on the road, and the traditional identification is mostly to set a mark picture on the ground, and the automobile will repeatedly roll on the mark picture when passing through the mark picture, so that the mark picture is easily displaced and damaged, and needs to be frequently replaced, thereby reducing the test efficiency of the automobile, and the application sets the test platform 1 in the test site of the automobile to be tested, the uphill plate 2 and the downhill plate 3 are arranged on the two sides of the test platform 1, the automobile to be tested can drive to the test platform 1 through the uphill plate 2 and can leave the test platform 1 through the downhill plate 3 on the other side, the light transmission plate 4 is arranged on the top of the test platform 1, different kinds of road marks can be automatically generated below the light transmission plate 4, the kind and form of the road mark are changed, the sudden change of the mark in the automatic driving process and the wear interference are simulated, so that whether the measure taken by the automobile to be tested to cope with different disturbances is correct can be tested, and the comprehensiveness and accuracy of the test of the automobile to be tested are improved.

[0022] The interference cavity 5 is arranged on the top of the test platform 1, the lifting plate 6 in the interference cavity 5 contains the magnetorheological fluid 8, a plurality of electromagnetic coils 9 are arranged in the lifting plate 6 in an array mode, the magnetorheological fluid 8 is in a flowing state in a normal state, is close to a common non-identification road surface, and cannot identify other information when a to-be-tested vehicle drives through; the main control unit 10 can control the electromagnetic coils 9 at different positions to be electrified; the electromagnetic coils 9 generate a magnetic field after being electrified; under the action of the magnetic field, the magnetorheological fluid 8 is gathered to the position of the magnetic field; the magnetorheological fluid 8 can be gathered to form a road identification after the electromagnetic coils 9 at the corresponding positions are selected to be electrified; the road identification can be identified when the to-be-tested vehicle passes above the light transmission plate 4; and different decision measures are taken according to the result of the identified road identification; in the process of testing, the main control unit 10 can instantaneously switch the electrification of the electromagnetic coils 9 at different positions, so that the road identification is switched, the change of the identification on the road is simulated, the rapid injection of the road identification interference is realized, and the comprehensiveness of the test of the to-be-tested vehicle is improved.

[0023] The electric push rod 7 is arranged at the bottom of the lifting plate 6, the electric push rod 7 can drive the lifting plate 6 to ascend and descend, so that the distance between the lifting plate 6 and the light transmission plate 4 is changed, that is, the storage space of the magnetorheological fluid 8 is changed; in the process of vehicle driving test, part of the magnetorheological fluid 8 above the lifting plate 6 can be extracted through the storage adjusting mechanism, so that the storage of the magnetorheological fluid 8 above the lifting plate 6 is reduced; at this time, when the road identification is generated through the electromagnetic coils 9, the color of the generated road identification is lighter due to the reduction of the storage of the magnetorheological fluid 8, the real road identification change after a long-term external environmental influence is simulated, and the identification ability of the automatic test vehicle to the road identification is evaluated; and since the storage of the magnetorheological fluid 8 is reduced, in order to ensure that the to-be-tested vehicle can collect the data of the road identification, the electric push rod 7 can drive the lifting plate 6 to ascend, so that the road identification is close to the light transmission plate 4, and thus the collection equipment of the to-be-tested vehicle can accurately collect the road identification for identification and decision.

[0024] The magnetorheological fluid 8 of the present application is generally composed of a base fluid, magnetic particles and additives; under the action of the base fluid, the magnetorheological fluid 8 as a whole presents a liquid state when not subjected to the action of a magnetic field; after a magnetic field is applied, the magnetic particles are subjected to a magnetic force, the viscosity of the magnetorheological fluid 8 as a whole changes, and gradually changes into a solid state as the magnetic field strength increases; therefore, under the action of the magnetic field, the magnetorheological fluid 8 can be gathered and solidified to form clear road identification.

[0025] Preferably, the identification arrangement mechanism further comprises a sealing rubber ring 11, the sealing rubber ring 11 is arranged on the side wall of the lifting plate 6 and is tightly arranged with the inner wall of the interference cavity 5.

[0026] When the storage of the magnetorheological fluid 8 changes, in order to ensure that the vehicle to be tested can accurately identify the road sign, the lifting plate 6 is lifted under the driving of the electric push rod 7. In order to avoid the magnetorheological fluid 8 flowing out from the gap between the lifting plate 6 and the interference cavity 5, a sealing rubber ring 11 is arranged on the side wall of the lifting plate 6. The sealing rubber ring 11 is located on the four side walls of the lifting plate 6 and is connected in one body, can seal the gap, and the number of the sealing rubber ring 11 can be set to two layers, which can avoid the magnetorheological fluid 8 entering the lower part of the lifting plate 6, and ensure that the magnetorheological fluid 8 can stably gather to form the road sign.

[0027] The side wall of the sealing rubber ring 11 is tightly arranged with the inner wall of the interference cavity 5. When the lifting plate 6 is lifted under the driving of the electric push rod 7, the sealing rubber ring 11 can move synchronously with the inner wall of the interference cavity 5 to avoid the magnetorheological fluid 8 overflowing from the gap. In order to avoid corrosion, the sealing rubber ring 11 is made of fluorine rubber, which has no obvious reaction to various substances in the magnetorheological fluid 8. It can not only ensure the sealing function, but also avoid corrosion of the magnetorheological fluid 8 and prolong the service life.

[0028] Preferably, the road sign includes lane lines, turning arrows and text signs.

[0029] When the road sign simulation interference is carried out, the electromagnetic coils 9 at different positions can be controlled to be powered on, so that the magnetorheological fluid 8 gathers to form the road sign. Common road signs include lane lines, turning arrows and text signs. After the two rows of electromagnetic coils 9 are powered on, two lane lines can be formed, so that whether the car can drive straight along the area between the lane lines can be tested, and whether the phenomenon of pressing the line occurs can be determined. When the turning arrow is generated, the electromagnetic coils 9 can be controlled to be powered on according to the composition of the turning arrow, so that the magnetorheological fluid 8 gathers to form the turning arrow. After the turning arrow is formed, the turning decision of the vehicle to be tested after recognizing the turning arrow can be observed. In addition, the specified electromagnetic coils 9 can be controlled to be powered on to generate the speed limit text sign by magnetically attracting the magnetorheological fluid 8. Then, whether the vehicle to be tested will reduce the speed to the speed specified by the text sign when passing through the text sign can be observed, so as to evaluate the performance of the vehicle to be tested under different kinds of road sign interference.

[0030] Preferably, the main control unit 10 generates magnetic fields of different intensities by driving the electromagnetic coils 9 at different positions to be powered on, so that the road sign formed by the magnetorheological fluid 8 appears to gradually change and / or be missing.

[0031] The road surface of the road is subjected to wind and sun for a long time and is rolled by wheels, and road signs are damaged or gradually changed, and the current automobile driving test does not consider this part, and the automatic driving performance of the automobile cannot be evaluated, and the electromagnetic coil 9 at different positions can be driven to generate different intensity magnetic fields, and under the action of different intensity magnetic fields, the aggregation degree of the magnetorheological fluid 8 is different, and the generated road signs are damaged or aggregated into a gradual change state, so that the real road sign interference can be simulated, and the comprehensiveness of the automobile driving test is improved.

[0032] Preferably, the reserve adjusting mechanism comprises a transition tank 12, a liquid pump 13, a feeding pipe 14, a discharging pipe 15 and a valve 16, the transition tank 12 is arranged in the test platform 1, the liquid pump 13 is arranged on both sides of the transition tank 12, the bottom end of the feeding pipe 14 is connected with the liquid pump 13 on one side, the top end is connected with the side wall of the interference cavity 5 and is located above the lifting plate 6, one end of the discharging pipe 15 is connected with the liquid pump 13 on the other side, the other end extends into the interference cavity 5 and passes through the lifting plate 6, the valve 16 is arranged on the part of the discharging pipe 15 located in the lifting plate 6 and the top end of the feeding pipe 14, and the main control unit 10 is electrically connected with the liquid pump 13 and the valve 16 respectively.

[0033] When it is necessary to change the reserve of the magnetorheological fluid 8 above the lifting plate 6, the liquid pump 13 can be started, and the valve 16 is opened, the liquid pump 13 can extract the magnetorheological fluid 8 from the bottom of the magnetorheological fluid 8 to the transition tank 12 through the discharging pipe 15 for transition storage, the setting of the liquid pump 13 can realize the adjustment of the flow of the magnetorheological fluid 8, so as to change the reserve of the magnetorheological fluid 8 above the lifting plate 6, so as to simulate road signs of different colors, and because the reserve of the magnetorheological fluid 8 is reduced, it is necessary to adjust the height of the lifting plate 6, so that the magnetorheological fluid 8 can be close to the light-transmitting plate 4, in order to avoid affecting the movement of the lifting plate 6, the discharging pipe 15 is selected as a telescopic bellows, which can follow the lifting plate 6 to lift.

[0034] When it is necessary to re-deliver the magnetorheological fluid 8 in the transition tank 12 back to the interference cavity 5, the liquid pump 13 on the other side can be started, the liquid pump 13 re-delivers the magnetorheological fluid 8 in the transition tank 12 back to above the lifting plate 6 through the feeding pipe 14, so that the reserve of the magnetorheological fluid 8 is increased, so that normal road signs can be simulated.

[0035] The top end of the discharge pipe 15 is arranged on the bottom surface of the lifting plate 6, so that the magnetorheological fluid 8 above the lifting plate 6 at different heights can be conveyed into the transition box 12 through the discharge pipe 15, and the feeding pipe 14 is arranged on the side wall of the interference cavity 5 and has a height greater than the lifting plate 6, so that the magnetorheological fluid 8 in the transition box 12 can be directly discharged onto the lifting plate 6 through the feeding pipe 14 under the action of the liquid pump 13. In addition, a valve 16 is arranged on the part of the discharge pipe 15 located in the lifting plate 6, so that the opening and closing control of the discharge pipe 15 can be realized through the valve 16, the magnetorheological fluid 8 can be prevented from entering the discharge pipe 15 to reduce the storage of the magnetorheological fluid 8, and the normal gathering of the road sign is ensured.

[0036] Preferably, the installation frame body 17, the electric control spray head 18, the illuminating lamp 19 and the water pipe 20 are further included, the installation frame body 17 is arranged above the test platform 1, the electric control spray head 18 and the illuminating lamp 19 are arranged on the installation frame body 17, the water pipe 20 is connected with the electric control spray head 18 and a water source, and the main control unit 10 is electrically connected with the electric control spray head 18 and the illuminating lamp 19.

[0037] When the automobile normally drives on the road, the road sign needs to be recognized, and the recognition accuracy of the automobile is relatively high in the case that the weather condition is good, but the recognition rate of the road sign is reduced in the rain or strong light. In order to test the automobile in different environments, a plurality of installation frame bodies 17 are arranged above the test platform 1, the automobile to be tested drives through the lower part of the installation frame body 17 when driving on the test platform 1, a plurality of electric control spray heads 18 are arranged on the installation frame body 17, an external water source can be conveyed to the electric control spray head 18, the test platform 1 can be simulated to rain through the electric control spray head 18, and the recognition of the road sign by the automobile to be tested under the interference of rain can be simulated after the road sign is generated below the light transmission plate 4, so that the comprehensiveness of the automobile driving test is improved.

[0038] In addition to simulating the rain, the recognition of the road sign in the strong light environment is also simulated, and the illuminating lamp 19 is also arranged on the installation frame body 17 to illuminate the lower part of the installation frame body 17 and provide strong light, so that the automobile to be tested can be simulated to recognize the road sign under the interference of strong light when driving.

[0039] The interval of the installation frame body 17 can be dynamically adjusted according to the water amount sprayed by the electric control spray head 18, if the water amount is too much, the simulated rain is too dense, the influence on the detection and recognition is too great, and the test result has no reference value, so that the installation frame body 17 can be arranged to be movable and the interval can be adjusted, so as to be suitable for various complex environments, and the overall size of the test platform 1 is relatively large, so that the automobile to be tested can perform various operations on the test platform 1, such as maintaining uniform speed, turning and stopping, etc.

[0040] Preferably, the sign arrangement mechanism further comprises a storage tank 21, an inert gas 22, a gas pump 23 and a gas pipe 24, the storage tank 21 is arranged in the test platform 1 and located above the transition tank 12, the inert gas 22 is filled in the storage tank 21, the gas pump 23 is arranged on the side wall of the storage tank 21, one end of the gas pipe 24 is connected with the gas pump 23, and the other end is connected with the top surface of the transition tank 12, and the main control unit 10 is electrically connected with the gas pump 23.

[0041] In order to improve the accuracy of automobile driving test, the storage tank 21 is arranged in the test platform 1, and the inert gas 22 such as nitrogen is stored in the storage tank 21. When the magnetorheological fluid 8 enters the transition tank 12, the gas pump 23 can inject the inert gas 22 into the transition tank 12, so that the flowing magnetorheological fluid 8 is mixed with the inert gas 22. The magnetorheological fluid 8 containing the inert gas 22 returns to the interference cavity 5, and when it is gathered under the action of the magnetic field of the electromagnetic coil 9, a porous structure can be formed, the reflectivity is improved, and it is suitable for different test scenes.

[0042] In addition, if the recognition rate of the road sign is low under strong light or rain environment, a part of the inert gas 22 can be appropriately introduced into the magnetorheological fluid 8 to improve the reflectivity, so as to avoid that the road sign cannot be recognized under special environment, resulting in that the test result has no reference value.

[0043] Preferably, the sign arrangement mechanism further comprises a rotary motor 25, a stirring shaft 26 and stirring blades 27, the rotary motor 25 is arranged on the top surface of the transition tank 12, the output shaft of the rotary motor 25 is connected with the top end of the stirring shaft 26, and the stirring blades 27 are arranged on the outer wall of the stirring shaft 26. The main control unit 10 is electrically connected with the rotary motor 25.

[0044] When the inert gas 22 is injected into the storage tank 21, the rotary motor 25 can be started, the rotary motor 25 drives the stirring blades 27 to rotate through the stirring shaft 26, the stirring blades 27 stir the magnetorheological fluid 8, so that the inert gas 22 fully contacts with the magnetorheological fluid 8, the reflectivity is improved, and when the inert gas 22 needs to be precipitated, the magnetorheological fluid 8 containing the inert gas 22 is transported into the transition tank 12, the rotary motor 25 stirs the magnetorheological fluid 8, so that the inert gas 22 is precipitated from the magnetorheological fluid 8. At this time, the reverse extraction function of the gas pump 23 can be started, the inert gas 22 precipitated above the transition tank 12 is extracted from the gas pipe 24 and returns to the storage tank 21, so as to avoid waste of the inert gas 22. Different reflectivity of the road sign can be simulated according to the demand, and the comprehensiveness and accuracy of the automobile driving test are improved.

[0045] In order to further improve the contact between the inert gas 22 and the magnetorheological fluid 8, a plurality of through holes can be arranged on the stirring blade 27, and in the stirring process, part of the magnetorheological fluid 8 can flow through the through holes to change the position of the magnetorheological fluid 8, so as to facilitate the full mixing contact between the inert gas 22 and the magnetorheological fluid 8.

[0046] Preferably, the identification arrangement mechanism further comprises a bearing 28 arranged on the bottom surface of the transition box 12, and the bottom end of the stirring shaft 26 is connected with the bearing 28.

[0047] When the stirring shaft 26 is driven to rotate by the rotating motor 25, the bottom end of the stirring shaft 26 can rotate under the support of the bearing 28, so as to ensure that the stirring blade 27 can stably stir the magnetorheological fluid 8, thereby accelerating the combination or precipitation of the inert gas 22 and the magnetorheological fluid 8.

[0048] Preferably, the identification arrangement mechanism further comprises a flow guide plate 29 arranged on the inner wall of the gas conveying pipe 24 in a cross manner.

[0049] When the precipitated inert gas 22 enters the gas conveying pipe 24 under the action of the gas pump 23, the inert gas 22 will contact the flow guide plate 29 arranged in a cross manner, the flow guide plate 29 changes the conveying track of the inert gas 22, so that the liquid droplets possibly contained in the inert gas 22 are intercepted by the flow guide plate 29 and flow downward to the transition box 12 under the action of gravity, thereby avoiding that the inert gas 22 in the storage box 21 contains too much moisture, and the flow guide plate 29 is arranged in a downward inclined state, so as to ensure that the intercepted liquid droplets slide downward.

[0050] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An interference injection system for automobile driving testing, characterized in that, The system includes a testing platform, an uphill ramp, a downhill ramp, a light-transmitting plate, and a marking arrangement mechanism. The testing platform is located on the vehicle's driving path. The uphill and downhill ramps are located on both sides of the testing platform. An interference cavity is provided on the testing platform, and the light-transmitting plate is located on the top surface of the interference cavity. The marking arrangement mechanism includes a lifting plate, an electric actuator, a magnetorheological fluid, an electromagnetic coil, a storage adjustment mechanism, and a main control unit. The lifting plate is located inside the interference cavity. The electric actuator is located on the bottom surface of the interference cavity, and its output shaft is connected to the bottom surface of the lifting plate. The magnetorheological fluid is located between the lifting plate and the light-transmitting plate. The electromagnetic coils are arranged in an array inside the lifting plate. The storage adjustment mechanism is located inside the testing platform and is used to adjust the storage volume of the magnetorheological fluid in the interference cavity. The main control unit is located on the bottom surface of the lifting plate and is electrically connected to the electric actuator, the electromagnetic coils, and the storage adjustment mechanism. The main control unit generates a magnetic field by driving the electromagnetic coils at different positions to cause the magnetorheological fluid to accumulate and form road markings.

2. The interference injection system for vehicle driving testing according to claim 1, characterized in that, The marking arrangement mechanism also includes a sealing ring, which is disposed on the side wall of the lifting plate and is tightly fitted against the inner wall of the interference cavity.

3. The interference injection system for automobile driving testing according to claim 1, characterized in that, The road markings include lane lines, turn arrows, and text markings.

4. The interference injection system for automobile driving testing according to claim 1, characterized in that, The main control unit generates magnetic fields of different intensities by driving electromagnetic coils at different positions to energize them, causing the road markings formed by the accumulation of magnetorheological fluid to gradually change and / or disappear.

5. The interference injection system for automobile driving testing according to claim 1, characterized in that, The storage adjustment mechanism includes a transition box, a liquid pump, a feed pipe, a discharge pipe, and valves. The transition box is located inside the test platform. The liquid pumps are located on both sides of the transition box. The bottom end of the feed pipe is connected to the liquid pump on one side, and its top end is connected to the side wall of the interference chamber and located above the lifting plate. One end of the discharge pipe is connected to the liquid pump on the other side, and the other end extends into the interference chamber and passes through the lifting plate. The valves are located on the part of the discharge pipe inside the lifting plate and on the top of the feed pipe. The main control unit is electrically connected to the liquid pumps and valves respectively.

6. The interference injection system for vehicle driving testing according to claim 5, characterized in that, It also includes a mounting frame, an electronically controlled nozzle, a lighting fixture, and a water pipe. The mounting frame spans across the test platform, the electronically controlled nozzle and the lighting fixture are mounted on the mounting frame, the water pipe connects the electronically controlled nozzle and the water source, and the main control unit is electrically connected to the electronically controlled nozzle and the lighting fixture.

7. The interference injection system for vehicle driving testing according to claim 6, characterized in that, The marking arrangement mechanism also includes a storage tank, an inert gas, a gas pump, and a gas delivery pipe. The storage tank is set inside the test platform and above the transition box. The inert gas fills the storage tank. The gas pump is set on the side wall of the storage tank. One end of the gas delivery pipe is connected to the gas pump, and the other end is connected to the top surface of the transition box. The main control unit is electrically connected to the gas pump.

8. The interference injection system for automobile driving testing according to claim 7, characterized in that, The marking arrangement mechanism also includes a rotary motor, a stirring shaft, and stirring blades. The rotary motor is located on the top surface inside the transition box, and its output shaft is connected to the top of the stirring shaft. The stirring blades are located on the outer wall of the stirring shaft. The main control unit is electrically connected to the rotary motor.

9. The interference injection system for automobile driving testing according to claim 8, characterized in that, The marking arrangement mechanism also includes a bearing, which is disposed on the bottom surface of the transition box, and the bottom end of the stirring shaft is connected to the bearing.

10. An interference injection system for vehicle driving testing according to claim 7, characterized in that, The marking arrangement mechanism also includes guide plates, which are arranged crosswise on the inner wall of the gas pipeline.

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