ABS brake test bench and ABS brake test method under dangerous road condition

Abstract

The invention relates to an ABS brake test bench and an ABS brake test method under dangerous road conditions. The test bed comprises a test bed body and a test bed base, a roller assembly on the test bed body is provided with a front roller, a middle roller and a rear roller, and bearings of the rollers are connected to a roller base frame through corresponding vertical sliding rails. A lifting jack used for supporting the test bench body and capable of driving the test bench body to vibrate is arranged between the bottom face of the test bench body and the groove bottom of the base groove, and an ejector rod used for ejecting the test bench body from the front end is arranged between the front side of the test bench body and the front side of the base groove. A push rod used for pushing the test bed body forwards is arranged between the rear side of the test bed body and the rear wall of the base groove. According to the test method, the test bed body is made to be in different postures and motion states through the roller assembly, the ejector rod, the push rod and the lifting jack so as to simulate corresponding road conditions. According to the invention, the working conditions of rolling stones and vibration road surfaces can be simulated so as to realize vehicle ABS braking efficiency detection under corresponding working conditions.

Description

Technical Field

[0001] The present invention relates to an ABS braking test bench and an ABS braking test method under dangerous road conditions, and can be mainly used for testing or experimenting on the ABS braking performance of vehicles under corresponding dangerous working conditions. Background Art

[0002] Existing vehicle ABS braking test benches are equipped with drum assemblies that cooperate with wheels. When the wheels rotate, they drive the drums in the drum assemblies to rotate. Flywheels and other inertial loads are arranged on the drums to simulate the inertia of vehicle driving. Braking is performed when the wheels reach a certain speed, and the braking performance is analyzed or calculated based on experimental data (such as braking time, load inertia, adhesion coefficient / friction coefficient, etc.). For example, Chinese patent document CN210802916U discloses a ramp ABS braking test bench, which includes a mounting groove plate. One end of the top of the mounting groove plate is rotatably installed with a ramp main body, and an adjusting mechanism is arranged at the other end of the mounting groove plate and the ramp main body. Four test components are installed on the ramp main body, and a buffer mechanism is arranged at the top end of the ramp main body. The vehicle driving on the four test components is fixedly clamped by two fixing mechanisms, and at the same time, the adjusting mechanism is used to adjust and support the angle of the ramp main body. Chinese patent document CN106441922 discloses a device for a passenger car ABS braking test bench. The drum rack can move along the direction of the rack-type slide rail. The wheels drive the drums by friction. An automatic sprinkler and a feeding mechanism are installed on the drum rack. A sand and gravel recovery device is installed at the lower end of the drum rack. A transmission device is installed between the feeding mechanism and the sand and gravel recovery device. The transmission device is driven by a motor, and the transmission belt has strip-shaped rubber protrusions. Chinese patent document CN218067038U discloses a ramp ABS braking test bench, which includes a base baffle. One end of the top of the base baffle is rotatably installed with a ramp main body. A buffer baffle is arranged on the inner side wall surface of the ramp main body. A row of buffer springs is movably connected to the side wall surface of the base baffle adjacent to the buffer baffle. A driven groove is opened at the lower end of the top of the base baffle. A first slide rod is horizontally installed on the inner wall surface of the driven groove. A docking groove is opened at the upper opening of the active groove and a baffle assembly is laid on two groups of docking grooves. The upper opening of other active grooves is provided with a baffle assembly through laying. These existing technologies each have their own characteristics and are respectively suitable for their respective occasions and experimental requirements, but still difficult to meet various needs in practice. For example, the test bench body itself is difficult to simulate the rolling stone road surface, bumpy (undulating) road surface, and road surface conditions affected by earthquakes or mountain floods, and the braking performance under these situations cannot be obtained. Summary of the Invention

[0003] The purpose of the present invention is to realize the simulation of the rolling stone (undulating) and vibrating road surface conditions by the test bench body, so as to be able to implement the detection of the ABS braking efficiency of vehicles under the corresponding working conditions.

[0004] The technical solution of the present invention is: an ABS braking test bench, including a test bench body, on which there are a plurality of roller assemblies (measurement and control units) corresponding to the wheels. The roller assembly is provided with a first roller, and the first roller includes a front roller and a rear roller. The roller assembly is further provided with a second roller, and the second roller is a middle roller located between the front roller and the rear roller. The bearings (or bearing brackets) of the front roller, the middle roller, and the rear roller are all connected to a roller base frame (the base frame of the roller assembly) through corresponding vertical (in the direction perpendicular to the top surface of the test bench body) slide rails (vertical linear guiding mechanisms). The vertical slide rails are provided with a vertical driving mechanism for driving the sliding member of the vertical slide rail to move vertically.

[0005] The bearings (bearing outer rings or bearing seats) of each roller (front roller, rear roller, and middle roller) can be set / installed on the sliding members (such as sliders) of the corresponding vertical slide rails, and the fixed members (such as chutes) of the vertical slide rails can be installed on the roller base frame. The vertical driving mechanism can adopt an oil cylinder (or air cylinder), or a lead screw nut mechanism provided with a driving motor, thereby realizing the vertical movement and fixation of the corresponding bearings.

[0006] When the bearings on both sides of the same roller are respectively provided with their own vertical slide rails, the slide rail driving mechanism for driving the same roller can be one, and its driving output member (such as the outer end of the piston rod of the oil cylinder) is connected to the sliding member of the vertical slide rail on either side (including the bearing seat of the corresponding bearing or the driving connecting plate and other members / structures fixedly connected to the sliding member); the slide rail driving mechanism for driving the same roller can also be two, and the driving output members of the two slide rail driving mechanisms are respectively connected to the sliding members of their corresponding vertical slide rails, and the two driving mechanisms move synchronously, thereby driving the sliding members of the slide rails on both sides of the roller to move synchronously.

[0007] Preferably, the first roller is connected to a first inertial load through a first transmission mechanism (such as a bevel gear set with two synchronous input ends). The first transmission mechanism is provided with two synchronous input ends, which are respectively connected to the rotating shafts of the front roller and the rear roller (such as connected through a coupling). The second roller is connected to a second inertial load through a second transmission mechanism.

[0008] Preferably, the transmission ratios of the first transmission mechanism and the second transmission mechanism are the same. When appropriate, they can also be different. A coupling (such as a flange connection structure) used to directly connect the two shaft ends is regarded as a transmission mechanism with a transmission ratio of 1.

[0009] Preferably, the first inertial load and the second inertial load adopt the same form, such as a flywheel.

[0010] The roller data (such as rotational speed, time to stop rotating, etc., for example, by setting corresponding sensors) can be detected according to the existing technology and these data can be analyzed and processed.

[0011] Preferably, such a test device is further provided with a test bench base. The test bench base is in a trough shape and is provided with a base trough capable of accommodating the test bench body (with a gap left to allow the test bench body to perform the required tilting and movement, but generally, the gap should be avoided from being too large to affect the stability of the test bench body). A lifter for supporting the test bench body and capable of driving the test bench body to vibrate is provided between the bottom surface of the test bench body and the bottom of the base trough. A push rod (push rod mechanism, or lifting push rod) for jacking up the test bench body from the front end (and allowing / capable of resetting) is provided between the front side of the test bench body and the front side of the base trough. A push rod (push rod mechanism, or lifting push rod) for pushing the test bench body forward (and allowing / capable of resetting) is provided between the rear side of the test bench body and the rear wall of the base trough.

[0012] Preferably, the upper end and the lower end of the lifter are respectively hinged to the bottom surface (lower surface) of the test bench body and the bottom of the base trough (for example, directly hinged to the bottom of the trough through a suitable hinge / hinged pair, or hinged to other parts fixed or movably connected to the bottom of the trough through a suitable hinge). The upper end and the lower end of the push rod are respectively hinged to the front side of the test bench body (for example, the near-front-end part of the bottom surface of the test bench body) and the front side of the base trough (for example, the front wall of the base trough). The front end and the rear end of the push rod are respectively hinged to the rear end of the test bench body (for example, the rear end face of the test bench body) and the rear wall of the base trough.

[0013] Generally, the push rod extends horizontally in the longitudinal direction (front-rear direction) to facilitate horizontally pushing the test bench body. In the case where the test bench body tilts forward and backward, the push rod can tilt slightly with the test bench body.

[0014] Preferably, both the push rod and the push rod adopt oil cylinders (including the so-called oil cylinders and air cylinders commonly referred to). The overall telescoping of the push rod and the push rod is achieved through the action of the oil cylinder. The stroke of the piston rod of the oil cylinder and the length of the piston rod are set according to actual needs. For example, the length of the piston rod can be increased on the basis of the original piston rod of a commercially available standard oil cylinder (for example, by connecting a section of rod) to meet the length requirements of the push rod. During installation, the bottom of the cylinder body (rodless end) of the oil cylinder can be used as the lower end of the push rod or the rear end of the push rod to be connected to the base trough, and the front end of the piston rod can be used as the upper end of the push rod or the front end of the push rod to be connected to the test bench body.

[0015] Preferably, an elastic spherical hinge is used for hinging between the upper end of the push rod and the front side of the test bench body. The upper end of the push rod is connected to the ball head of the elastic spherical hinge, and the front side of the test bench body is connected to the ball socket (sliding shoe) of the corresponding elastic spherical hinge. An elastic spherical hinge is used for hinging between the front end of the push rod and the rear end of the test bench body. The front end of the rear push rod is connected to the ball head of the corresponding elastic spherical hinge, and the rear end of the test bench body is connected to the ball socket of the corresponding elastic spherical hinge.

[0016] Furthermore, an elastic pad is provided between the ball head and the ball socket of the elastic ball hinge. Thus, relative displacement between the ball head and the ball socket can be achieved by relying on the deformation of the elastic pad. The elastic pad conforms to the shape of the ball socket and fills the space between the ball head and the ball socket.

[0017] The number of the ejector rods is usually multiple and distributed at different positions in the transverse direction (for example, at least including both ends in the transverse direction) to achieve balanced / stable support for the test bench body.

[0018] The number of the push rods can be one or more. When there are multiple push rods, they are usually symmetrically arranged left and right. When there is one push rod, it can be arranged in the center in the transverse direction to achieve balanced thrust.

[0019] Preferably, the lifter adopts an oil cylinder. The overall telescoping of the lifter is achieved through the action of the oil cylinder. The stroke of the piston rod of the oil cylinder and the length of the piston rod are set according to actual needs. The bottom (rodless end) of the cylinder block of the oil cylinder can be connected to the bottom of the base groove (or the sliding member of the longitudinal slide rail provided at the bottom of the groove) as the lower end of the lifter, and the front end of the piston rod can be connected to the bottom surface of the test bench body as the upper end of the lifter.

[0020] Preferably, a longitudinal slide rail (longitudinal linear guiding mechanism, or lifter slide rail) is provided on the bottom of the base groove. The lower end of the lifter is hinged to the sliding member of the corresponding longitudinal slide rail, thereby realizing the hinge connection with the bottom of the groove.

[0021] The upper end of the lifter (for example, the upper end of the corresponding piston rod of the oil cylinder) can be connected to the hinge member (for example, the ball head of the ball hinge) through an elastic connecting member (for example, a leaf spring or a helical spring).

[0022] The number of lifters is usually multiple, preferably symmetrically distributed left and right and front and back. Generally, lifters should be provided at both lateral sides and both longitudinal ends. Through the cooperation of the lifters with the ejector rods and the push rods, balanced / stable support for the test bench body is achieved. For example, in the horizontal state of the test bench body, the test bench body can be supported by each lifter.

[0023] ABS braking test method under dangerous road conditions. An ABS braking test is carried out using any one of the ABS braking test benches disclosed in the present invention, including the ABS braking test under normal road conditions and / or the ABS braking test under abnormal road conditions / dangerous road conditions. The following methods are used to simulate a rolling stone and / or a bumpy (undulating) road surface: controlling the relative movement of the first roller and the second roller in the vertical direction (the direction perpendicular to the top surface of the test bench body), simulating a road surface protrusion or a road rolling stone by making the second roller higher than the first roller, and simulating a road surface depression by making the second roller lower than the first roller; and / or, the following method is used to simulate a flat road surface: controlling the second roller to be lower than the first roller so that the wheel does not contact the second roller (when the wheel rotates, it does not drive the middle roller to rotate or the influence of the middle roller rotation can be ignored), and maintaining this state unchanged. In this case, the height of the first roller in each roller assembly (relative to the top surface of the test bench body) can generally be kept consistent.

[0024] The relative vertical movement (including relative position and relative position change) of the first roller and the second roller can be controlled respectively according to the preset road surface unevenness change or rolling stone condition, and the moving speeds (including directions) of the first roller and the second roller can be controlled respectively based on the vehicle driving speed (which can be converted from the wheel rotation speed) and the preset road surface unevenness change or rolling stone condition, so that the relative positions of the first roller and the second roller in the roller assembly corresponding to any wheel at any moment exactly conform to the road surface condition corresponding to that wheel at that moment.

[0025] Independent control can be implemented for each roller assembly to simulate the road surface conditions involved (should be in) for each wheel, and to achieve the simulation of the road surface undulation conditions (overall undulation and local undulation conditions) and / or rolling stone conditions.

[0026] Preferably, the ABS braking test bench is further provided with a test bench base. The test bench base is in a groove shape and is provided with a base groove capable of accommodating the test bench body. A lifter for supporting the test bench body and capable of driving the test bench body to vibrate is provided between the bottom surface of the test bench body and the bottom of the base groove. A jack for jacking up the test bench body from the front end is provided between the front side of the test bench body and the front side of the base groove. A push rod for pushing the test bench body forward is provided between the rear side of the test bench body and the rear wall of the base groove.

[0027] In the above situation, any one or more of the following road surface simulation methods can be adopted: 1) Simulating a ramp: Using the jack to jack up the front end of the test bench body so that the top surface of the test bench body is at a set slope; 2) Simulate vertical vibration: When the test bench body is in a horizontal or inclined (with a slope) state, adjust or set the position of the lower end of the lifter so that the extension direction (axis direction) of the lifter is perpendicular to the top surface of the test bench body, and control the lifter to perform telescopic movements at a set frequency and amplitude, thereby driving the test bench body to vibrate; 3) Simulate longitudinal vibration: When the test bench body is in a horizontal or inclined (with a slope) state, control the push rod to perform telescopic movements at a set frequency and amplitude, thereby driving the test bench body to vibrate; 4) Simulate road surface roll: When the test bench body is in a horizontal or inclined (with a slope) state, control the roller assemblies on both sides (transverse sides) of the test bench body to be at different heights (relative to the top surface of the test bench body), thereby causing the vehicle located on the test bench body to be in a roll state.

[0028] Through the combination of various simulation methods, several complex and / or dangerous road conditions can be formed.

[0029] The beneficial effects of the present invention are as follows: Since a middle roller is provided in the roller assembly and the up-and-down movement of each roller can be achieved through each vertical slide rail, the middle roller can be higher than the front and rear rollers to form a convex shape in the middle, or the middle roller can be lower than the front and rear rollers to form a concave shape in the middle. Through the alternating transformation of convexity and concavity, it can better simulate the rolling stones on the road surface and bumpy road surfaces as well as the rolling stones and bumps on the road surface caused by harsh environments such as earthquakes and floods; Since a lifter capable of driving the vibration of the test bench body is provided, it can better simulate the road surface vibration or a vibration-like effect caused by harsh environments such as earthquakes or floods; Since a push rod and a top rod are provided, the inclination of the test bench body can be achieved under the coordinated action of the push rod and the top rod, and it can better simulate an inclined road surface; Since the lifter and the test bench body are hinged, and a longitudinal slide rail is provided between the lifter and the test bench base, allowing the lifter to appropriately change its position and attitude as the test bench body inclines, ensuring that the lifter can still effectively vibrate the test bench body when the test bench body is in an inclined state; Since an elastic connecting member can be provided at the upper end of the lifter, buffering near the highest point and the lowest point (the highest point and the lowest point during the vibration of the lifter) can be achieved, reducing the load capacity requirements of the lifter, and it can better simulate the ground vibration state; Since the connection between the push rod and the top rod and the test bench body can adopt an elastic spherical hinge, on the basis of ensuring the action of the push rod and the top rod on the test bench body, it is beneficial to realize the vibration of the test bench body, and it is beneficial to reduce the impact of the vibration on the push rod, the top rod and the connection structure between them and the test bench body, and it is beneficial to extend the service life; Since the number of top rods can be multiple, it is not only beneficial to balance and stability, but also allows different top rods to adopt different lengths, and it can better simulate the roll of the road surface; Since the number of rear top rods can be one or more, and the rear top rods are connected to the test bench body and the test bench base by spherical hinges, it can cooperate with the top rod to realize a certain degree of roll of the test bench body; Since the front roller and the rear roller are connected to the same bevel gear set, it is beneficial to ensure the synchronous and constant-speed rotation of the front and rear rollers through the bevel gear set. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the state change of the test bench related to the present invention; Figure 2 It is a schematic diagram of the plane (retracted) state of the test bench related to the present invention; Figure 3 It is a schematic diagram of the horizontal lifting state of the test bench related to the present invention; Figure 4 It is a schematic diagram of the inclined state of the test bench related to the present invention; Figure 5 It is a schematic diagram (top view) of the test bench body related to the present invention; Figure 6 It is a schematic diagram (top view) of the roller assembly related to the present invention; Figure 7 Schematic diagram (side view) of the vertical relative position between the first drum and the second drum in the drum assembly related to the present invention; Figure 8 Schematic diagram (end face) of the drum assembly related to the present invention; Figure 9 Schematic diagram of the convexity / undulation (the middle drum is relatively convex) formed based on the drum assembly; Figure 10 Schematic diagram of the convexity / undulation (the middle drum is relatively concave) formed based on the drum assembly; Figure 11 Schematic diagram of the elastic ball hinge related to the present invention.

[0031] Markings in the figure: 1. Test bench base; 2. Test bench body; 201. Drum base frame; 202. Front drum; 203. Middle drum; 204. Rear drum; 205. First bearing; 206. Second bearing; 207. Second inertia load; 208. First inertia load; 209. First transmission mechanism; 210. Vertical slide rail; 211. Ball head; 212. Ball socket; 213. Elastic pad; 214. Elastic connecting piece; 3. Locking device; 4. Lifting device; 5. Longitudinal slide rail; 6. Jack rod; 7. Push rod. Detailed implementation manners

[0032] Refer to Figures 1 to 11 , this detection device is provided with a trough-shaped test bench base 1 and a test bench body 2. The base trough on the test bench base and the test bench body are both rectangular parallelepipeds. The width and length of the base trough are slightly larger than the test bench body to allow the test bench body to move and flip relative to the test bench base, and there is a clearance allowing flipping.

[0033] The test bench body can adopt a structure roughly the same as that of the existing related test bench body. Usually, four drum assemblies (or called test assemblies, or test units) are provided, corresponding to the four wheels of the vehicle. During detection, the vehicle is placed on the test bench body, and the four wheels are respectively pressed on the four drum assemblies. When the wheels rotate, they drive the drums to rotate. By detecting the drum data during the braking process, the braking performance of the vehicle can be analyzed / operated.

[0034] The drum assembly is provided with a first drum, and the first drum includes a front drum 202 and a rear drum 204. A second drum is added on the basis of the first drum, and the second drum is a middle drum 203 located between the front drum and the rear drum. Bearings of each drum (including a first bearing 205 of the first drum and a second bearing 206 of the second drum) are respectively connected to a drum base frame (the base frame of the drum assembly) 201 through respective corresponding vertical slide rails (longitudinal linear guiding mechanisms) 210. The vertical slide rails are provided with vertical driving mechanisms for driving the sliding members of the vertical slide rails to move vertically.

[0035] A jack 6, a push rod 7 and a lifter 4 are arranged between the test bench base and the test bench body. The jack is used to lift the front end of the test bench body. The push rod is used to push and pull the test bench body forward and backward, cooperate with the jack to make the test bench body in a suitable inclined state, and can drive the test bench body to reciprocate back and forth (longitudinal vibration) to simulate or cooperate with simulating dangerous working conditions such as earthquakes. The lifter cooperates with the jack and the push rod to realize the support of the test bench body and drive the test bench body to vibrate up and down. A longitudinal slide rail 5 is arranged at the lower end of the lifter, allowing the lifter to adjust its posture through the longitudinal movement at the lower end to facilitate ensuring the vibration direction. When necessary, an electromagnetic locking device between the sliding member and the fixed member can be arranged on the longitudinal slide rail through the prior art. After the posture of the lifter is adjusted, the position of the sliding member is locked, and then the longitudinal position of the lower end of the lifter and the posture of the lifter are locked.

[0036] An appropriate hinged structure (hinged pair) can be adopted to realize the hinging between relevant components. For example, an elastic ball hinge is used for hinging between the upper end of the jack and the front side of the test bench body. The upper end of the jack is connected to the ball head of the elastic ball hinge, and the front side of the test bench body is connected to the ball socket (slider) of the corresponding elastic ball hinge. An elastic ball hinge is used for hinging between the front end of the push rod and the rear end of the test bench body. The front end of the rear jack is connected to the ball head of the corresponding elastic ball hinge, and the rear end of the test bench body is connected to the ball socket of the corresponding elastic ball hinge. An elastic pad 213 is arranged between the ball head 211 and the ball socket 212 of the elastic ball hinge.

[0037] The upper end of the lifter (for example, the upper end of the piston rod of the corresponding oil cylinder) can be connected to a hinged member (for example, the ball head of a ball hinge) through an elastic connecting member (for example, a leaf spring or a helical spring) 214. The inertial load of the drum can be set according to actual needs. For example, a flywheel can be used. The inertial load is used to simulate the inertial effect of the vehicle during the braking process. For example, the first drum is connected to the first inertial load 208 through a first transmission mechanism (for example, a bevel gear set with two synchronous input ends) 209. The first transmission mechanism has two synchronous input ends, which are respectively connected to the rotating shafts of the front drum and the rear drum (for example, connected through a coupling). The second drum is connected to the second inertial load 207 through a second transmission mechanism. Generally, the transmission ratios of the first transmission mechanism and the second transmission mechanism are the same. When appropriate, they can also be different.

[0038] A lock 3 can be provided between the test bench body and the test bench base. The lock can adopt a folding rod structure formed by sequentially connecting the ends of multiple rods. One end is connected (for example, connected through bolts and connection structures matching the bolts) to the rear part of the test bench body, and the other end is connected to the rear part of the test bench base to limit the maximum forward movement amplitude of the test bench body.

[0039] The present invention can be used for the following detections: 1) Flat road braking detection: It includes two situations: complete flat road detection and flat road bump detection.

[0040] The test bench body is in a horizontal state. The top surface of the test bench body is aligned with or higher than the top surface of the test bench base (corresponding to complete flat road detection and flat road bump detection respectively). The top rod and the push rod are retracted or removed (disconnected). The lifter is in a vertical state to support the test bench body. Vertical vibration and front-back vibration are not implemented. Road surface bumps (the middle drum moves up to contact the wheel or jacks up the wheel) or convex-concave transformation are implemented or not implemented. Different types of vehicles are coordinated to drive into and out of the test bench body to perform detections under corresponding working conditions.

[0041] 2) Ramp braking detection: It includes three situations: simple ramp road detection, ramp road bump detection, and ramp vibration detection.

[0042] The test bench body is pushed by the top rod to the required ramp angle and is separately and independently connected to the measurement and control unit. The top rod acts as a support to lift the test bench body. The positions of the corresponding sliding parts in the longitudinal slide rail are controlled (a longitudinal drive mechanism for driving the movement of the sliding parts of the longitudinal slide rail can be provided, for example, a longitudinal drive oil cylinder, or a longitudinal lead screw nut mechanism with a drive motor), and the length of the lifter is adjusted so that the lower end of the lifter slides to the corresponding position of the longitudinal slide rail. According to requirements, vertical vibration and / or longitudinal vibration are implemented or not implemented through the lifter and / or the push rod to respectively simulate the corresponding ramp vibration or static state, and detections under corresponding working conditions are performed.

[0043] 3) Flat road vibration detection It includes two working conditions: simple vibration on flat road and vibration on flat road with bumps.

[0044] The test bench body is horizontal (the top surface is aligned with or higher than the top surface of the test bench base), the ejector rod and the push rod are in the retracted or removed (disconnected) state, and vertical vibration and / or longitudinal vibration are implemented through the lifter and / or the push rod according to requirements to perform the detection under the corresponding working conditions.

[0045] The test working conditions can be set according to actual needs.

[0046] For example, in one embodiment, based on the situation that a driver in a hilly city encounters a slight landslide on the road, the braking performance of the vehicle in the case of the driver's subconscious braking is detected. The specific working conditions are: the road slope is 5°, the earthquake frequency is 5 - 20 Hz, and there are occasional rolling stones on the road surface.

[0047] Set the adhesion coefficient of each wheel, that is, different materials of the rollers, according to the test requirements. The vehicle drives onto the test bench body, makes the wheels contact with the corresponding front and rear rollers, starts the vehicle to run at a low speed to straighten the wheels, and fixes the body to prevent it from running out. Control the ejector rod to lift the front end of the test bench body to a 5° tilt, and the lower end of the lifter slides to the corresponding position on the longitudinal slide rail, so that the extension direction (or axial direction) of the lifter is perpendicular (basically perpendicular) to the test bench body (top surface).

[0048] During the test, the lifter performs telescopic actions at a frequency of 5 Hz to simulate ground vibration, and the front and rear rollers and the middle roller move up and down (in the direction perpendicular to the road surface) with a 30 mm difference based on the vertical slide rail (and its driving mechanism) to simulate the obstruction of rolling stones to the wheels.

[0049] During the detection, start the vehicle, the wheels drive the rollers to rotate. When the vehicle slides at a speed of 40 km / h, it can be emergently braked until the vehicle speed is zero. Based on the roller speed (speed change), driving distance (the vehicle driving distance calculated based on the wheel rotation), braking time during the braking process, and the dynamic friction coefficient of the selected roller material and other vehicle and roller data, calculate the adhesion coefficient utilization rate of the vehicle, the slip rate of the vehicle relative to the ground, and the braking performance, and evaluate the performance of the vehicle ABS system.

[0050] The present invention can be widely used for simulating the detection of the ABS effectiveness of vehicles under the conditions of various geological disaster-prone areas (such as vehicle detection in areas with heavy rainstorms, mountain flood disasters, etc. and vehicle detection under various dangerous working conditions in rescue and disaster relief work), to detect the braking performance of the vehicle when the driver performs emergency braking on special dangerous road surfaces in different cities and different regions. It can not only detect the influence of external forces on the whole test as much as possible, but also is beneficial to the research and development of ABS, the inspection of rally cars, and the teaching of vehicle-related majors.

[0051] Each of the preferred and optional technical means disclosed in the present invention can be arbitrarily combined to form several different specific embodiments, unless otherwise specified or one preferred or optional technical means is a further limitation of another technical means.

Claims

1. An ABS braking test bench, comprising a test bench body, on which a plurality of roller assemblies corresponding to wheels are provided, each roller assembly is provided with a first roller, and the first roller includes a front roller and a rear roller, characterized in that The drum assembly further includes a second drum, which is a middle drum located between the front drum and the rear drum. The bearings of the front drum, the middle drum, and the rear drum are all connected to the drum base frame through corresponding vertical slide rails, and the vertical slide rails are provided with a vertical driving mechanism for driving the sliding member of the vertical slide rail to move vertically.

2. The test device according to claim 1, characterized in that There is also a test bench base. The test bench base is in a trough shape and is provided with a base trough capable of accommodating the test bench body. Between the bottom surface of the test bench body and the trough bottom of the base trough, there is a lifter for supporting the test bench body and capable of driving the test bench body to vibrate. Between the front side of the test bench body and the front side of the base trough, there is a jack for jacking up the test bench body from the front end. Between the rear side of the test bench body and the rear wall of the base trough, there is a push rod for pushing the test bench body forward.

3. The test device according to claim 1, characterized in that The upper end and the lower end of the lifter are respectively hinged to the bottom surface of the test bench body and the trough bottom of the base trough. The upper end and the lower end of the jack are respectively hinged to the front side of the test bench body and the front side of the base trough. The front end and the rear end of the push rod are respectively hinged to the rear end of the test bench body and the rear wall of the base trough.

4. The test device according to claim 1, wherein Both the jack and the push rod are hydraulic cylinders.

5. The test device according to claim 1, characterized in that Between the upper end of the jack and the front side of the test bench body, it is hinged by an elastic spherical hinge. The upper end of the jack is connected to the ball head of the elastic spherical hinge, and the front side of the test bench body is connected to the ball socket of the corresponding elastic spherical hinge. Between the front end of the push rod and the rear end of the test bench body, it is hinged by a corresponding elastic spherical hinge. The front end of the rear jack is connected to the ball head of the corresponding elastic spherical hinge, and the rear end of the test bench body is connected to the ball socket of the corresponding elastic spherical hinge.

6. The test device according to claim 1, wherein The lifter is a hydraulic cylinder.

7. The test device according to claim 1, wherein There is a longitudinal slide rail on the trough bottom of the base trough, and the lower end of the lifter is hinged to the sliding member of the corresponding longitudinal slide rail, thereby realizing the hinge with the trough bottom.

8. ABS braking test method under dangerous road conditions, characterized in that When conducting an ABS braking test using the ABS braking test bench described in claim 1, the following methods are used to simulate rolling stones and / or undulating roads: control the relative vertical movement between the first drum and the second drum. Simulate road bumps or rolling stones by making the second drum higher than the first drum, and simulate road depressions by making the second drum lower than the first drum; and / or, use the following method to simulate a flat road: control the second drum to be lower than the first drum so that the wheel does not contact the second drum and maintain this state unchanged.

9. The ABS braking test method according to claim 8, characterized in that The ABS braking test bench further includes a test bench base. The test bench base is in a trough shape and is provided with a base trough capable of accommodating the test bench body. Between the bottom surface of the test bench body and the trough bottom of the base trough, there is a lifter for supporting the test bench body and capable of driving the test bench body to vibrate. Between the front side of the test bench body and the front side of the base trough, there is a jack for jacking up the test bench body from the front end. Between the rear side of the test bench body and the rear wall of the base trough, there is a push rod for pushing the test bench body forward.

10. The ABS braking test method according to claim 8, characterized in that Use any one or more of the following road surface simulation methods: Simulate a ramp: Use a jack to jack up the front end of the test bench body so that the top surface of the test bench body is at a set slope; Simulate vertical vibration: When the test bench body is in a horizontal or inclined state, adjust or set the position of the lower end of the lifter so that the extension direction of the lifter is perpendicular to the top surface of the test bench body, and control the lifter to perform telescopic movements at a set frequency and amplitude, thereby driving the test bench body to vibrate; Simulate longitudinal vibration: When the test bench body is in a horizontal or inclined state, control the push rod to perform telescopic movements at a set frequency and amplitude, thereby driving the test bench body to vibrate; Simulate road surface roll: When the test bench body is in a horizontal or inclined state, control the roller assemblies on both sides of the test bench body to be at different heights, thereby causing the vehicle located on the test bench body to be in a rolled state.

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