CN104502014A - Rack-based braking force detection device and method capable of automatically adjusting automobile axle load - Google Patents

Abstract

The invention belongs to the technical field of automobile braking performance detection methods, and in particular relates to a braking force detection device and method based on a stand-based automatic adjustment of automobile axle loads; a stand-based braking force detection device for automatic adjustment of automobile axle loads, including Axle load braking test bench, lifting table, data acquisition and processing system and control system, two identical lifting tables are installed, which are evenly distributed on the front and rear sides of the automobile axle load braking test bench; the vehicle axle load is automatically adjusted based on the bench The detection method of the braking force detecting device comprises the following steps: 1, zeroing the equipment in the data acquisition and processing system, collecting axle load and braking force signals; 2, automatically adjusting the height of the non-detecting wheels on the lifting platform; 3, Detect the braking force of the vehicle and measure the axle; the invention automatically adjusts the height of the lifting platform attached to the automobile axle load braking test bench to realize the real simulation of the braking effect of the vehicle on the automobile axle load braking test bench on the actual horizontal road surface, and accurately detect to the braking performance of the vehicle.

Description

Braking force detection device and method for automatic adjustment of automobile axle load based on bench

technical field

The invention belongs to the technical field of automobile braking performance detection methods, and in particular relates to a braking force detection device and method for automatic adjustment of automobile axle loads based on a stand.

Background technique

In the current vehicle braking performance test, the vehicle is weighed on the ground wheel weight platform and then driven onto the vehicle axle load braking test bench for braking testing. According to the national standard GB7258-2012 "Technical Conditions for Safety of Motor Vehicle Operation", the braking force requirements are tested. The percentage of the front axle braking force and the front axle load is required to be greater than or equal to 60%, and the definition: the axis before the center position of the longitudinal centerline of the motor vehicle is the front axle. axle, other axles are the rear axle; all axles of the trailer are calculated as the rear axle; therefore, the dual steering axles are all front axles, and the axle braking ratio is required to be greater than or equal to 60%, and the axle braking ratio of all axles of the trailer is required to be greater than It is equal to 50%, and the braking rate of the whole vehicle is required to be greater than or equal to 60%. However, tests have shown that the second steering shaft of a dual-steering axle vehicle will be partially overhead by the first steering shaft and the third shaft during detection, greatly reducing the attachment weight, and it is difficult to meet the detection requirements of the 60% braking rate of the front axle.

When the trailer is being tested by the tractor, the third axle of the trailer is also partly lifted off by the second axle and the front axle of the tractor. Mobility testing requirements. Even if the braking performance of the vehicle is very good, the reduction of the attached weight will reduce the maximum braking force detected, and the reduction of the axle braking rate compared with the weighing weight on the ground wheel weight platform is difficult to meet the standard, resulting in false detection and misjudgment.

For above problem, existing technology is: 1, by loading method, increase weight or add pressure to vehicle or add the tension to measured axle to increase the adhesion weight of wheel to cylinder, the operability of this method is extremely poor. 2. Using the power mechanism to lift the vehicle axle load brake test bench to detect multi-axle vehicles, the structure is complex, the price is high, and the operation is troublesome. 3. The detection is carried out on the combined platform of weighing and braking, the reduced attachment weight and detection braking force, although it can meet the detection of the axle braking rate of multi-axle vehicles, but due to the greatly reduced axle weight and overall The weight of the vehicle and the braking force virtually greatly reduce the braking performance requirements of the vehicle, which is an irregular test.

Contents of the invention

The main purpose of the present invention is to provide a braking force detection device and method based on a stand-based automatic adjustment of the axle load of an automobile. According to the axle load distribution ratio of each axle of a multi-axle vehicle, the height of the lifting platform of the lifting platform is automatically adjusted. The axle load braking test bench truly simulates the braking effect of the vehicle on the actual horizontal road surface, so as to accurately detect the braking performance of the vehicle.

Above-mentioned purpose of the present invention is realized by following technical scheme, is described as follows in conjunction with accompanying drawing:

A braking force detection device based on a bench-based automatic adjustment of automobile axle loads, comprising an automobile axle load braking test bench 30, a lifting platform 3, a data acquisition and processing system and a control system, and the lifting platform 3 is provided with two identical , the same two platforms are respectively the front side lifting platform 35 and the rear side lifting platform 36, and the front side lifting platform 35 and the rear side lifting platform 36 are evenly distributed on the front and rear sides of the automobile axle load braking test bench 30, each The platform lifting platform includes the lifting platform lifting device and the foundation;

Every elevating platform refers to any one in the front side elevating platform 35 and the rear side elevating platform 36, and the front side elevating platform 35 and the rear side elevating platform 36 are set identically.

The lifting device of the lifting platform includes an inclined plate 24, a lifting platform 23, an axle load sensor 27, a lifting support I-beam 18, an air bag 28 and a lifting guide rail 22;

The foundation is composed of a front foundation 20 and a rear foundation 34, the front foundation 20 and the rear foundation 34 are symmetrically arranged, and both are provided with a foundation inclined surface 33;

The lifting platform 23 is connected to the inclined plates 24 on both sides through the hinge shaft 21, and the lower part of the end of the inclined plate 24 close to the inclined surface 33 of the foundation is provided with an inclined plate wheel 29, and the inclined plate 33 of the foundation passes through the inclined plate. Plate wheels 29 support the inclined plate 24;

The lifting platform 23 is fixed on the rectangular steel frame 26, the upper surface of the axle load sensor 27 is fixedly connected with the rectangular steel frame 26, and the lower surface of the axle load sensor 27 is connected with the lifting support I-beam 18 is fixedly connected, the air bag 28 is fixed on the base of each lifting platform, the upper surface of the air bag 28 is in contact with the lifting support I-beam 18, and the lifting guide rail 22 is fixed on both sides of the base of each lifting platform ; The lifting support I-beam 18 moves up and down along the lifting guide rail 22;

The data acquisition and processing system includes a signal conditioning module 8, an analog wiring board 9, an analog acquisition card 14 and an industrial computer 16;

The analog acquisition card 14 is connected to the analog wiring board 9; the analog wiring board 9 is connected to the signal conditioning module 8; the signal conditioning module 8 is respectively connected to the axle load sensor 27, the automobile The axle load sensor on the axle load braking test bench 30 and the braking force sensor on the automobile axle load braking test bench 30 are connected;

The control system includes a digital output card 1 and a solenoid valve 2 ; the digital output card 1 is connected to the solenoid valve 2 , and the solenoid valve 2 is connected to the air bag 28 .

The longitudinal centerline of the front side lifting platform 35, the longitudinal centerline of the rear side lifting platform 36 and the longitudinal centerline of the automobile axle load brake test bench 30 described in the technical solution coincide, the transverse centerline of the front side lifting platform 35, the rear side The transverse centerline of the lifting platform 36 and the transverse centerline of the automobile axle load braking test bench 30 are parallel to each other, and the transverse center line of the automobile axle load braking test bench 30 reaches the front lifting platform 35 and the rear side lifting platform 36 The distance is 1350mm.

In the technical solution, there are 8 inclined plates 24, and there are 4 inclined plates 24 on each lifting platform; the length of the inclined plates 24 is the same as that of the lifting platform 23;

Three inclined plate channel steels 25 are fixed on the lower surface of the inclined plate 24, and the adhesion coefficients between the upper plane of the inclined plate 24 and the upper plane of the lifting platform 23 are all above 0.1.

The lifting platform 23 described in the technical solution is provided with 4 pieces, and each lifting platform is provided with 2 lifting platforms 23;

The length of described lifting platform 23 is identical with the length of the roller on automobile axle load braking test stand 30;

Described axle load sensor 27 is provided with 8, and each lifting platform is provided with 4, and each maximum weighing 4000kg.

There are 8 airbags 28 described in the technical proposal, and 4 are provided on each lifting platform;

Described lifting guide rail 22 is provided with 4, and every lifting platform is provided with 2.

The inclination angle of the inclined surface 33 of the foundation described in the technical solution is 45 degrees, and the height of the vertical surface 32 at the end of the inclined surface of the foundation is 36 to 38 mm.

Lifting and supporting I-beams 18 described in the technical proposal are fixed with lifting limit wings 17; each lifting platform base is fixed with lifting and limiting doors 19, and lifting and supporting I-beams 18 are raised and lowered. Move up and down along the lifting guide rail 22 in the space limited by the limit door 19 .

There are 4 lifting limit fins 17 described in the technical solution, and 2 are set on each lifting platform;

Described lifting limit door 19 is provided with 4, and every lifting platform is provided with 2.

The digital output card 1 and the analog acquisition card 14 described in the technical solution are all installed in the ISA slot of the industrial computer 16, and the industrial computer 16, the analog wiring board 9 and the signal conditioning module 8 are all arranged in the control cabinet 31 .

A detection method of the brake force detection device based on the automatic adjustment of the vehicle axle load according to claim 1, comprising the following specific steps:

Step 1: Zero-adjust the equipment in the data acquisition and processing system, and collect axle load and braking force signals;

a) Before the vehicle enters the testing site, the data acquisition and processing system sets the axle load of the front lift platform 35, the axle load of the rear lift platform 36, and the axle load and braking force of the automobile axle load braking test bench 30 is zero;

b) After the vehicle enters the testing site, the dot matrix display screen 15 prompts the vehicle detection axle to drive into the vehicle axle load braking test bench 30. Just be on the described rear side lifting platform 36, the non-detection axle adjacent to the front is just on the described front side lifting platform 35, and now the industrial computer 16 will receive the proximity switch on the automobile axle load test stand 30 to detect the vehicle The measured axle reaches the signal of the vehicle axle load braking test bench 30, and then through the data acquisition and processing system, records the non-measured axle load on the front lift platform 35 and the non-measure axle load on the rear lift platform 36. The measured axle load on the heavy and automobile axle load brake test bench 30.

Step 2: Automatically adjust the height of non-detection wheels on the lifting platform;

The multi-axle vehicle enters the automobile axle load braking test bench 30, and the industrial computer 16 detects the non-measurement and measurement axle loads of the vehicle. According to the axle load distribution ratio of each axle of the multi-axle vehicle, the industrial computer 16 controls the solenoid valve 2 through the control system. Realize airbag 28 inflation or deflation, control the height of described front side lifting platform 35 and rear side lifting platform 36; The measuring axle and the axle load of the measuring axle reach the axle load distribution ratio of each axle of the multi-axle vehicle, simulate the braking effect on the actual horizontal road surface, and detect the braking force of the vehicle.

Step 3: Detect vehicle measuring shaft braking force;

a) After automatically adjusting the heights of the front lifting platform 35 and the rear lifting platform 36, the driver is prompted to brake through the dot matrix display 15, and the braking force signal generated by the braking force sensor of the automobile axle load braking test bench 30 is collected, And send it to the data acquisition and processing system to calculate the braking force at this time;

b) The vehicle is completely stationary, and the dot matrix display screen 15 displays the left wheel braking force 12 of the vehicle measuring axis and the left wheel braking force 13 of the measuring axis, and the display interface of the industrial computer 16 presents a curve showing the relationship between the axle load and the braking force signal as a function of time.

Technical effect of the present invention:

1. The lifting device of the lifting platform of the present invention can be well combined with the wheels of the car. After the airbag is inflated, the lifting platform can be raised to make the inclined plate, the lifting platform, the front side foundation and the rear side foundation form a plane, which is convenient for the vehicle Driving; after the airbag is deflated, the lifting platform descends to form a trapezoidal groove on the inclined plate, lifting platform, front side foundation and rear side foundation, which not only saves materials and space, but also contributes to the stability of the wheels.

2. The present invention is based on the axle load and braking force signals collected by the data acquisition and processing system, and according to the axle load distribution ratio of each axle of the multi-axle vehicle, the industrial computer automatically controls the height of the lifting platform through the control system, and realizes the axle load braking test of the vehicle. On the platform, the braking effect of the vehicle on the actual level road surface can be simulated, so as to quickly and accurately detect the braking performance of the vehicle.

3. The present invention starts from the angle of axle load, and solves well the deformation of each axle wheel of a multi-axle vehicle on the ground and on the automobile axle load braking test bench, while various axle wheels are on the ground and on the automobile axle. The error problem caused by the rigid contact of the heavy braking test bench makes the experiment more accurate and the calculation is convenient.

4. The method of the present invention is simple to operate and easy to maintain, can be conveniently applied to automobile inspection lines, and can effectively implement inspection.

Description of drawings

Below in conjunction with accompanying drawing, the present invention will be further described:

Fig. 1 is a schematic diagram of automobile braking force detection;

Figure 2a is a longitudinal side view of the lifting platform in a descending state;

Fig. 2b is a transverse front view of the lifting platform in a descending state;

Fig. 3a is a longitudinal side view of the raised state of the lifting platform;

Fig. 3b is a transverse front view of the rising state of the lifting platform;

Figure 4 is a layout diagram of the equipment installation location;

Fig. 5 is a foundation diagram of the lifting platform;

Figure 6a is a front view of the lifting plate;

Figure 6b is a side view of the lifting plate;

Figure 7a is a front view of the inclined plate;

Figure 7b is a side view of the inclined plate;

In the figure: 1——digital output card

2——Solenoid valve

3——Elevator

4——Non-measuring axle right wheel load

5——Non-measuring shaft left wheel load

6——right wheel load of wheel load gauge

7——Left wheel load on wheel loader

8——Signal Conditioning Module

9——Analog terminal board

10—Measuring shaft left wheel load

11——Measuring axle right wheel load

12——Measuring shaft left wheel braking force

13——Measuring shaft right wheel braking force

14——Analog Acquisition Card

15——dot matrix display

16——Industrial Computer

17——Lifting limit fin

18——Lifting support I-beam

19——lift limit door

20—Front foundation

21——hinge shaft

22——Lifting guide rail

23——Lifting platform

24 - inclined plate

25——Inclined plate channel steel

26 - rectangular steel frame

27——Axle load sensor

28 - air bag

29 - tilting board wheels

30——Automobile axle load brake test bench

31——control cabinet

32——The vertical surface at the end of the inclined surface of the foundation

33——Sloped surface of foundation

34——Rear side foundation

35——Front lifting table

36——Rear lifting table

Detailed ways

The specific implementation of the device of the present invention will be further described in detail below in conjunction with the embodiments shown in the accompanying drawings.

The braking force detection device based on the automatic adjustment of the vehicle axle load on the bench, including the vehicle axle load braking test bench 30, and two identical lifting platforms located at the front and rear sides of the automobile axle load braking test bench 30. 3. Data collection Processing system and control system, each lifting platform in the lifting platform 3 includes a lifting platform lifting device and a foundation.

The lifting device of the lifting platform includes an inclined plate 24, a hinge shaft 21, a lifting platform 23, an axle load sensor 27, a rectangular steel frame 26, a lifting support I-beam 18, an air bag 28, a lifting guide rail 22, and a lifting limit Wing 17 and lifting limit door 19. Referring to Figures 2a and 2b and Figures 3a and 3b, the front and rear sides of the lifting platform 23 are connected to the inclined plates 24 on both sides through the hinge shaft 21, and the inclined plate 29 on the other end of the inclined plate 24 passes through the inclined plate of the foundation. Supporting the inclined plate 24, the upper and lower surfaces of the axle load sensor 27 are respectively connected with the rectangular steel frame 26 and the lifting support I-beam 18, the lifting support I-beam 18 is connected with the air bag 28, and the rectangular steel frame 26 is connected with the lifting platform The plates 23 are connected, and the lifting limit wing 17 is fixed on the lifting support I-beam 18 by bolts. Along with the lifting support I-beam 18 moves up and down along the lifting guide rail 22 in the space limited by the lifting limit door 19.

The data acquisition and processing system includes a signal conditioning module 8 , an analog wiring board 9 , an analog acquisition card 14 and an industrial computer 16 . Referring to Fig. 1, the signal conditioning module 8 is connected with the axle load sensor 27 on the lifting platform 3 and the axle load sensor and the braking force sensor on the automobile axle load braking test bench 30, and the analog quantity wiring board 9 is connected with the signal conditioning module 8, and simulates The quantity acquisition card 14 is connected to the analog quantity terminal board 9 through a cable, and the analog quantity acquisition card 14 is installed in the ISA slot of the industrial computer 16, and the industrial computer 16, the analog quantity terminal board 9 and the signal conditioning module 8 are placed in the control cabinet 31 .

The control system includes a digital output card 1 and a solenoid valve 2 . Referring to FIG. 1 , the digital output card 1 is installed in the ISA slot of the industrial computer 16 and connected with the solenoid valve 2 , which is connected with the lifting platform 3 .

There are two lifting platforms 3: the front lifting platform 35 and the rear lifting platform 36, the longitudinal centerline of the front lifting platform 35, the longitudinal centerline of the rear lifting platform 36 and the longitudinal centerline of the automobile axle load braking test bench 30 Coincidentally, the transverse centerline of the front lifting platform 35, the transverse centerline of the rear lifting platform 36 and the transverse centerline of the automobile axle load braking test bench 30 are parallel to each other, and the front lifting platform 35 and the rear lifting platform 36 are evenly distributed. Located on the front and rear sides of the automobile axle load braking test bench 30, the distance from the transverse centerline of the automobile axle load braking test bench 30 to the front lifting platform 35 and the rear lifting platform 36 is 1350mm.

There are 8 inclined plates 24 in total, and 4 inclined plates 24 are arranged on every lifting platform. Its length is the same as the length of the lifting platform 23. In order to increase the strength of the inclined plate 24, three inclined plate channel steels 25 are welded below each inclined plate 24. For convenience, the inclined plate 24 moves on the foundation inclined surface 33. One end of each inclined plate channel steel 25 near the foundation inclined surface 33 is provided with inclined plate wheels 29, and the adhesion coefficients of the upper plane of the inclined plate 24 and the upper plane of the lifting platform 23 are all above 0.1 respectively.

There are 8 airbags 28 in total, and there are 4 on each lifting platform. The following airbag 28 is fixed on the base by bolts, and the above is in contact with the lifting support I-beam 18, and supports this lifting support I-beam 18.

There are totally 4 lift limit wings 17, and there are 2 on every lifting platform. There are 4 lifting limit doors 19, and there are 2 on every lifting platform. There are 4 lifting guide rails 22, and each lifting platform has 2. The airbag 28 is initially in a contracted state. During the process of inflating the airbag 28, the lifting support I-beam 18 and other components will move upward along the lifting guide rail 22. When it rises to a certain height, the lifting support I-beam 18 will The fixed lifting limit wing 17 will be restricted by the lifting limit door 19, and then rise to the highest state. When the airbag 28 is deflated, the lifting support I-beam 18 and other components will move downward along the lifting guide rail 22 , until the airbag 28 contracted state.

There are 4 lifting platforms 23 in total, and 2 lifting platforms 23 are arranged on each lifting platform. Its length is the same as the length of the roller on the vehicle axle load braking test bench 30. In order to increase the strength of the lifting platform 23, a rectangular steel frame with the same size as the lifting platform 23 is placed on the lower surface of the lifting platform 23. 26. There are 8 axle load sensors 27, 4 on each lifting platform, and each maximum weighing 4000kg.

The front side foundation 20 and the rear side foundation 34 of each lifting platform are the same, and the inclination angle of the foundation inclined surface 33 is 45 degrees, and the height of the vertical surface 32 at the end of the foundation inclined surface is 36 to 38mm.

A detection method for the above-mentioned brake force detection device based on the vehicle axle load automatic adjustment based on the stand, comprising the following specific steps:

The present invention uses LZ-1000 type wheel weight meter to measure the axle load of the vehicle, and further determine the axle load distribution ratio of each axle of the multi-axle vehicle. The present invention also uses the HZ-1302 type automobile axle load braking test bench, which can obtain the signals of the left and right axle load sensors and the left and right braking force sensors, and is used to obtain the left wheel load of the multi-axle vehicle, the load of the right wheel of the measured axle, Measuring shaft left wheel braking force and measuring shaft right wheel braking force.

1. The equipment in the data acquisition and processing system is zeroed, and the axle load and braking force signals are collected

Before the vehicle enters the testing site, the data acquisition and processing system will now compare the axle load of the front lift platform 35, the axle load of the rear lift platform 36, and the axle load and braking force of the automobile axle load braking test bench 30 Set to zero, when the vehicle enters the testing site, the dot-matrix display screen 15 prompts the vehicle detection axle to drive into the vehicle axle load braking test bench 30. When the detection axle is on the automobile axle load braking test bench 30, there The adjacent non-detection shaft is just on the rear side lifting platform 36, and the non-detection shaft adjacent to the front side of the detection axis is just on the front side lifting platform 35. The proximity switch detects the signal that the measured axle of the vehicle arrives at the vehicle axle load braking test bench 30, and then records the non-measured axle load on the front lifting platform 35 and the rear lifting platform 36 through the data acquisition and processing system. The non-measuring axle load and the measuring axle load on the automobile axle load braking test bench 30.

2. Automatically adjust the height of non-detection wheels on the lifting platform

After the multi-axle vehicle enters the automobile axle load braking test bench 30, the industrial computer 16 detects the vehicle non-measurement axle and the measurement axle axle weight, and according to the axle load distribution ratio of each axle of the multi-axle vehicle, the industrial computer 16 is controlled by the control system. Solenoid valve 2 can inflate or deflate the air bag 28, and then control the height of the front lifting platform 35 and the rear lifting platform 36; during this process, the data acquisition and processing system will detect the axle load of the measuring axis and the non-measuring axis in real time , until the axle load of the non-measuring axle and the measuring axle reaches the axle load distribution ratio of each axle of the multi-axle vehicle, so as to truly simulate the braking effect on the actual horizontal road surface and accurately detect the braking force of the vehicle.

3. Detection of the braking force of the vehicle measuring shaft

After the height automatic adjustment on the lifting platform 3 is completed, the driver is prompted to brake through the dot matrix display screen 15. At this time, the braking force sensor of the automobile axle load braking test bench 30 is transmitted to the data acquisition and processing system, and the braking force at this time is calculated. After the vehicle is completely still, the dot matrix display screen 15 will display the vehicle measurement shaft left wheel braking force 12 and the measurement shaft left wheel braking force 13, and the display interface of the industrial computer 16 appears the curve of the axle load and the braking force signal as a function of time.

The present invention takes a four-axle trailer as a specific example to analyze and illustrate the detection of the third axle of the vehicle. The present invention uses the LZ-1000 type wheel load meter to measure the axle load of the vehicle, and further determine the axle load distribution ratio of each axle of the multi-axle vehicle. The present invention also uses the HZ-1302 model automobile axle load brake test bench 30, which can obtain the signals of the left and right axle load sensors and the left and right braking force sensors, and is used to obtain the load of the left wheel of the measuring axle and the load of the right wheel of the measuring axle of the multi-axle vehicle. , Measuring axis left wheel braking force and measuring axis right wheel braking force.

Since the distribution ratio of each axle load of a four-axle trailer is different due to different models, the specific distribution ratio of the axle load is also different. Generally, the first axle and the second axle are non-floating axles, and the axle loads of the two axles are different. The third axle and the fourth axle It is a floating bridge axle, and the axle loads of the two axles are the same.

A braking force detection device for automatic adjustment of automobile axle load based on a bench, including a lifting platform lifting device, a data acquisition and processing system and a control system. The driver of the vehicle operates according to the prompt of the dot matrix display 15, and the dot matrix display 15 prompts the third axle of the vehicle to enter the vehicle axle load braking test bench 30. Non-measuring axle right wheel load 4, non-measuring axle left wheel load 5 and measuring axle left wheel load 10 on the automobile axle load brake test bench 30, measuring axle right wheel load 11, measuring axle left wheel braking force 12 and measuring axle right wheel brake force Power 13 is set to zero, and this moment front side elevating platform 35 is rising state, facilitates vehicle to pass through. When the third axle of the vehicle arrived at the vehicle axle load braking test bench 30, the fourth axle at this moment would stop on the rear lift platform 36, and the industrial computer 16 would receive the approaching test on the automobile axle load braking test bench 30. The switch detects the signal that the measured axle of the vehicle arrives at the vehicle axle load braking test bench 30. At this moment, the data acquisition and processing system will record the fourth axis on the rear lifting platform 36 and the third axle on the automobile axle load braking test bench 30. The axle load of the axle, according to the axle load distribution ratio of the third axle and the fourth axle of the trailer, if the axle load of the third axle is greater than the axle load of the third axle on the horizontal road surface and the axle load of the fourth axle is less than the axle load of the fourth axle on the horizontal road surface , the industrial computer 16 will control the solenoid valve 2 through the control system to deflate the airbag 28 and lower the rear lifting platform 36; The fourth axle load on the horizontal road surface, the industrial computer 16 controls the solenoid valve 2 through the control system to inflate the airbag 28 and raise the rear lifting platform 36; during this process, the data acquisition and processing system will detect the third axle in real time. The axle loads of the third and fourth axles until the axle loads of the third and fourth axles reach the axle load distribution ratio of the third and fourth axles of the trailer. Realize the real simulation of the braking effect of the vehicle on the vehicle axle load braking test bench 30 on the actual road surface, so as to accurately detect the braking performance of the vehicle. Through the continuous prompting of the dot matrix display screen 15, until the brake is prompted, the driver will step on the brake, and the vehicle axle load braking test bench 30 braking force sensor detects that the signal is sent to the data acquisition and processing system, and the braking force at this time is calculated. When the vehicle is completely stationary, the dot matrix display screen 15 will display the braking force of the left and right wheels of the third axis of the vehicle, and the display interface of the industrial computer 16 will show the curve of the relationship between the axle load and the braking force signal as a function of time, and the detection of the third axis braking force will be completed. .

The braking force detection device based on the bench-based automatic adjustment of the vehicle axle load has the advantages of simple, convenient and fast transformation of the existing vehicle axle load braking test bench, and greatly improves the accuracy of multi-axle vehicle braking detection. In order to overcome the deficiencies in the prior art, this method automatically adjusts the height of the lifting platform attached to the axle load braking test bench of the vehicle according to the axle load distribution ratio of each axle of the multi-axle vehicle, so as to realize the real adjustment of the vehicle on the axle load braking test bench of the vehicle. Simulate the braking effect on the actual level road surface, and then accurately detect the braking performance of the vehicle.

Claims (10)

1. a braking force detection device based on the automatic adjustment of the automobile axle load of bench, comprising automobile axle load braking test bench (30), lifting platform (3), data acquisition and processing system and control system, is characterized in that: Described elevating platform (3) is provided with identical two, and described identical two are respectively front side elevating platform 35 and rear side elevating platform 36, and described front side elevating platform (35) and rear side elevating platform (36 ) are evenly distributed on the front and rear sides of the automobile axle load braking test bench (30), and each lifting platform includes a lifting platform lifting device and a foundation; The lifting device of the lifting platform includes an inclined plate (24), a lifting platform (23), an axle load sensor (27), a lifting support I-beam (18), an air bag (28) and a lifting guide rail (22); The foundation is composed of a front foundation (20) and a rear foundation (34), the front foundation (20) and the rear foundation (34) are arranged symmetrically, and both are provided with a foundation inclined surface (33); The lifting platform (23) is connected to the inclined plates (24) on both sides through the hinge shaft (21), and the lower part of the inclined plate (24) near the foundation inclined surface (33) is provided with inclined plate wheels ( 29), the inclined surface of the foundation (33) supports the inclined plate (24) through the inclined plate wheel (29); The lifting platform (23) is fixed on the rectangular steel frame (26), the upper surface of the axle load sensor (27) is fixedly connected with the rectangular steel frame (26), and the lower surface of the axle load sensor (27) The surface is fixedly connected with the lifting support I-beam (18), the air bag (28) is fixed on the base of each lifting platform, and the upper surface of the air bag (28) is connected with the lifting support I-beam (18). ) contact, the lifting guide rail (22) is fixed on both sides of the base of each lifting platform; the lifting support I-beam (18) moves up and down along the lifting guide rail (22); The data acquisition and processing system includes a signal conditioning module (8), an analog wiring board (9), an analog acquisition card (14) and an industrial computer (16); The analog acquisition card (14) is connected to the analog wiring board (9); the analog wiring board (9) is connected to the signal conditioning module (8); the signal conditioning module (8) is respectively connected to the lifting The axle load sensor (27) on the platform (3), the axle load sensor on the automobile axle load braking test bench (30), and the braking force sensor on the automobile axle load braking test bench (30) are connected; The control system includes a digital output card (1) and a solenoid valve (2); the digital output card (1) is connected to the solenoid valve (2), and the solenoid valve (2) is connected to the air bag (28). 2. A kind of braking force detection device based on the automatic adjustment of the vehicle axle load of the stand according to claim 1, characterized in that: The longitudinal centerline of the front side lifting platform 35, the longitudinal centerline of the rear side lifting platform 36 coincide with the longitudinal centerline of the automobile axle load brake test bench 30, the transverse centerline of the front side lifting platform 35, the rear side lifting platform 36 The transverse centerline of the automobile axle load braking test bench 30 is parallel to each other, and the distance from the transverse center line of the automobile axle load braking test bench 30 to the front side lifting platform 35 and the rear side lifting platform 36 is equal to It is 1350mm. 3. A kind of braking force detection device based on the automatic adjustment of the vehicle axle load of the stand according to claim 1, characterized in that: Described slanting plate (24) is provided with 8 pieces, and there are 4 slanting plates (24) on each lifting platform; The length of described sloping plate (24) is identical with the length of lifting platform (23); Three inclined plate channel steels (25) are fixed on the lower surface of the inclined plate (24), and the adhesion coefficients between the upper plane of the inclined plate (24) and the upper plane of the lifting platform (23) are all above 0.1. 4. A kind of braking force detection device based on the automatic adjustment of the vehicle axle load of the stand according to claim 1, characterized in that: The lifting platform (23) is provided with 4 pieces, and each lifting platform is provided with 2 lifting platforms (23); The length of described lifting platform (23) is identical with the length of the cylinder above automobile axle load braking test stand (30); Described axle load sensor (27) is provided with 8, and each lifting platform is provided with 4, and each maximum weighing 4000kg. 5. A kind of braking force detection device based on the automatic adjustment of the vehicle axle load of the stand according to claim 1, characterized in that: Described air bag (28) is provided with 8, and each lifting platform is provided with 4; Described lifting guide rail (22) is provided with 4, and every lifting platform is provided with 2. 6. A kind of braking force detection device based on the automatic adjustment of the vehicle axle load of the stand according to claim 1, characterized in that: The inclination angle of the inclined surface of the foundation (33) is 45 degrees, and the height of the vertical surface (32) at the end of the inclined surface of the foundation is 36 to 38 mm. 7. A kind of braking force detection device based on the automatic adjustment of the vehicle axle load of the stand according to claim 1, characterized in that: The lifting and supporting I-beam (18) is fixed with a lifting limit wing (17); each lifting platform base is fixed with a lifting and limiting door (19), and the lifting and supporting wings (17) are fixed with the lifting and supporting workers. Word steel (18) moves up and down along the lifting guide rail (22) in the space limited by the lifting limit door (19). 8. A kind of braking force detection device based on the automatic adjustment of the vehicle axle load of the stand according to claim 7, characterized in that: The lifting limit wings (17) are provided with 4, and each lifting platform is provided with 2; Described lift limit door (19) is provided with 4, and every lifting platform is provided with 2. 9. A kind of braking force detection device based on the automatic adjustment of the vehicle axle load of the stand according to claim 1, characterized in that: Described digital quantity output card (1), analog quantity acquisition card (14) are all installed in industrial computer (16) ISA slot, described industrial computer (16), analog quantity wiring board (9) and signal conditioning module ( 8) are all located in the control cabinet (31). 10. a kind of detection method of the braking force detection device based on the automobile axle load automatic adjustment of stand according to claim 1, is characterized in that, comprises the following concrete steps: Step 1: Zero-adjust the equipment in the data acquisition and processing system, and collect axle load and braking force signals; a) Before the vehicle enters the testing site, the data acquisition and processing system will compare the axle load of the front lift platform (35), the axle load of the rear lift platform (36) and the axle load of the automobile axle load braking test bench (30) Axle load and braking force are set to zero; b) After the vehicle enters the testing site, the dot-matrix display screen (15) prompts the vehicle testing axle to drive into the vehicle axle load braking test stand (30). Adjacent non-detection shafts are just on the rear side lifting platform (36), and front adjacent non-detection shafts are just on the described front side lifting platform (35). The proximity switch on the test bench 30 detects the signal that the measured axle of the vehicle arrives at the vehicle axle load brake test bench 30, and then records the non-measured axle load and rear axle load on the front lifting platform 35 through the data acquisition and processing system. The non-measuring axle load on the side lifting platform 36 and the measuring axle load on the automobile axle load braking test bench 30. Step 2: Automatically adjust the height of non-detection wheels on the lifting platform; The multi-axle vehicle enters the automobile axle load braking test bench (30), and the industrial computer (16) detects the axle loads of the non-measured and measured axles of the vehicle. According to the axle load distribution ratio of each axle of the multi-axle vehicle, the industrial computer (16) passes The control system controls the solenoid valve (2) to inflate or deflate the air bag (28), and controls the height of the front lifting platform (35) and the rear lifting platform (36); during this process, the data acquisition and processing system real-time Accurately detect the axle load of the measuring axle and non-measuring axle until the axle load of the non-measuring axle and measuring axle reaches the axle load distribution ratio of each axle of the multi-axle vehicle, simulate the braking effect on the actual horizontal road surface, and detect the braking force of the vehicle . Step 3: Detect vehicle measuring shaft braking force; a) After automatically adjusting the heights of the front lifting platform (35) and the rear lifting platform (36), the driver is prompted to brake through the dot matrix display (15), and the vehicle axle load braking test bench (30) is collected. The braking force signal generated by the power sensor is sent to the data acquisition and processing system to calculate the braking force at this time; b) The vehicle is completely stationary, the dot matrix display screen (15) displays the left wheel braking force (12) of the vehicle measuring axis and the left wheel braking force (13) of the measuring axis, and the axle load and braking force signals appear over time on the display interface of the industrial computer (16). Variation curve.