CN106404264A - Measuring device and method for the internal resistance of stand based on counterforce roller cylinder brake test console - Google Patents

Abstract

The invention relates to a bench internal resistance measuring device and method based on a reaction force roller brake test bench. The device is mainly composed of a force application and force measuring device (A), a fixing device (B), a counter force roller brake test bench (C), and a tire suspension device (D). The measuring device and method can be applied to bench calibration, by adjusting the force-applying and force-measuring device (A) to apply load to the tire suspension device (D), thereby simulating the wheel load in the actual inspection process of the automobile, and obtaining different The internal resistance value of the bench under the wheel load is used to establish the relationship between the internal resistance of the bench and the axle load. For different vehicle models, the corresponding bench internal resistance F _x is determined according to different axle loads, and the error compensation of the braking force is performed to improve the detection accuracy. The device can be widely used in automobile testing, testing and scientific research institutions.

Description

Bench Internal Resistance Measuring Device and Method Based on Counterforce Roller Brake Test Bench

technical field

The invention relates to a vehicle testing device and method, in particular to a bench internal resistance measuring device and method based on a reaction force roller brake test bench.

Background technique

The braking performance of a car is directly related to the driving safety of the car. It is one of the must-test items for the safety performance of the car. The braking test bench is often used to test the braking performance. At present, most of the braking testing equipment used in domestic vehicle performance testing stations is reaction roller brake test bench. The test principle is: the tested wheel is placed between the main and driven rollers, the third roller is pressed down, and the proximity switch is turned on. The motor is started through the delay circuit, and the wheel is driven to rotate at a low speed through the reducer, the chain drive, and the main and driven rollers. After the wheel speed stabilizes, the driver depresses the brake pedal. The friction torque of the wheel brake is transmitted to the roller through the tire and becomes the force exerted by the tire on the roller. At the same time, the roller has a reaction force to the tangential direction of the periphery of the tire, so as to overcome the brake friction moment and maintain the wheel to continue to rotate. Due to the existence of the force, the reducer housing and the force-measuring lever swing together in the opposite direction of the drum rotation. The force or displacement of the force-measuring lever is converted into an electrical signal proportional to the braking force by the sensor, which is collected and processed by the computer. The detected braking force is output by an indicating device or a printer.

At present, when the car is tested on the reaction roller test bench, the driving motor will drive the roller group and other rotating parts of the test bench to move together. During the movement, the friction between the rotating parts will have energy Loss, including the friction loss between the tire and the roller and the friction loss between the internal transmission system of the test bench. Among them, the friction loss generated inside the test bench is the internal resistance of the bench. The vehicle braking force detected during the detection process also includes this part of the resistance, resulting in errors in the detection results. Therefore, before the reaction roller brake test bench is put into use, its internal resistance should be determined and calibrated to make the test results more accurate. Now the sliding method is usually used to determine the internal resistance of the bench, and the value of the internal resistance of the bench obtained by using the law of conservation of kinetic energy in the sliding method is usually a fixed value, because the internal resistance of the bench is related to the axle load of the vehicle and the vehicle detection Therefore, there is a large error in the sliding method.

Contents of the invention

The purpose of the present invention is to solve the problem of inaccurate braking force results caused by inaccurate internal resistance of the test bench for vehicles with different axle loads during the detection process of the reaction force roller brake test bench. Provided are a device and method for measuring the internal resistance of a bench based on a reaction force roller brake test bench. By measuring the value of the internal resistance of the bench under different axial loads, the relationship between the internal resistance of the bench of the reaction roller brake test bench and the axle load of the vehicle is determined, and the error compensation is performed on the braking force results to make the test results more precise.

In order to solve the problems of the technologies described above, the present invention is achieved by adopting the following technical solutions:

A bench internal resistance measuring device based on a reaction force roller brake test bench, mainly composed of a force and force measurement device A, a fixing device B, a reaction force roller brake test bench C and a tire suspension device D, The tire suspension device D is linked with the force application and force measurement device A through a hinge, the force application and force measurement device A is fixed on the fixing device B through a bolt connection, and the fixing device B is fixed on the reaction force through a bolt connection On the platform of type drum brake test bench C; in the force application and force measurement device A, the force application handle 1 is connected with the lead screw 2 through a key, the lead screw 2 and the base body 3 are threaded, and the lead screw 2 and the connection The component I5 transmits force through the slider 4, the slider 4 is connected with the base 3 through the guide block 7, and moves longitudinally on the base 3 along the guide block 7, and the force sensor 6 is connected with the slider 4 through the connecting piece I5.

In the fixing device B, the connecting plate 14 and the base body 3 in the force measuring device A are connected by bolts, the lead screw 15 and the lead screw 17 have the same structure and are connected through the connecting sleeve 16, the lead screw 17 is connected to the bottom plate 20 Connected by hinges, the bottom plate 20 is fixed on the frame of the reaction force drum brake test bench C by bolts.

A method for measuring the internal resistance of a bench based on a reaction force roller brake test bench, by rotating the force applying handle 1 to adjust the force applying and force measuring device A, and applying a load to the tire suspension device D, thereby simulating the axle load of the automobile;

When the roller group of the reaction roller brake test bench drives the tire to rotate, read the value of the force sensor 6 instrument to obtain the simulated shaft load, and measure the internal resistance value of the bench in real time according to the data acquisition system of the reaction roller brake test bench F _x , to establish the relationship between the axial load and the internal resistance of the bench.

Compared with prior art, the beneficial effects of the present invention are:

1. At present, the internal resistance of the bench is calibrated before the braking force is detected by the reaction force roller brake test bench. The obtained calibration value is a fixed value, but in the actual testing process, the internal resistance of the bench will vary due to the axial load. The difference of the difference produces changes, and the measuring device of the internal resistance of the bench established by the present invention can measure the internal resistance of the bench under different axial loads, and can perform error compensation on the braking force result.

2. The bench internal resistance measuring device based on the reaction force roller brake test bench of the present invention has the advantages of simple structure, convenient operation, small space occupation, low cost, high detection accuracy, and accurate simulation by adjusting the force applying device The size of different axle loads does not need to be calibrated with a real vehicle. In the calibration process, only this device is needed to determine the value of the internal resistance of the bench during the detection process of vehicles with different axle loads.

Description of drawings

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

Fig. 1 is the shaft of the bench internal resistance measuring device based on the reaction force roller brake test bench of the present invention

measured projection map;

Fig. 2 a is in the bench internal resistance measuring device based on the counterforce type drum brake test bench of the present invention

Axonometric projections of force application and force measurement devices;

Figure 2b is a partially enlarged view of Figure 2a;

Fig. 3 is in the bench internal resistance measuring device based on the reaction force roller brake test bench of the present invention

Axonometric projection of fixtures;

Fig. 4 is in the bench internal resistance measuring device based on the reaction force roller brake test bench of the present invention

Schematic diagram of the simplified model of the reaction roller brake test bench;

Fig. 5 a is in the bench internal resistance measuring device based on the reaction force roller brake test bench of the present invention

Axonometric projection of tire suspension device;

Figure 5b is a partially enlarged view of Figure 5a;

Fig. 6 is in the bench internal resistance measuring device based on the reaction force roller brake test bench of the present invention

Schematic diagram of the data acquisition system.

In the figure: A. Applied force and force measuring device, B. Fixing device, C. Simplified model of counter force roller brake test bench, D. Tire suspension device, 1. Force applying handle, 2. Lead screw Ⅰ, 3 .Basic body, 4. Slider, 5. Connector Ⅰ, 6. Force sensor, 7. Guide block, 8. Connector Ⅱ, 9. Support frame, 10. Hinge, 11. Lower connector, 12. Upper connector , 13. Connecting pin, 14. Connecting plate, 15. Lead screw Ⅱ, 16. Connecting sleeve, 17. Lead screw Ⅲ, 18. Fastening bolt, 19. Bolt hole, 20. Bottom plate, 21. Rack, 22. Chain, 23. driven roller, 24. third roller, 25. driving roller, 26. piston rod, 27. damping spring, 28. support race, 29. shock absorber, 30. lower swing arm, 31. tight Fastening bolt, 32. ball seat, 33. universal steering knuckle, 34. brake disc, 35. tire, 36. brake caliper, 37. ball seat, 38. ball seat, 39. upper swing arm, 40. Fastening nut, 41. Fastening bolt Ⅰ, 42. Fastening bolt Ⅱ, 43. Fastening nut, 44. Ball pin, 45. Analog signal amplification terminal board, 46. Analog acquisition card, 47 . Industrial computer.

detailed description

The present invention is described in detail below in conjunction with accompanying drawing:

The invention provides a device and method for measuring the internal resistance of a bench based on a reaction force roller brake inspection bench, which can improve the accuracy of vehicle braking performance detection. Research on vehicle braking performance has high social value and extensive social significance, and it can promote the safe operation, ride comfort and stability of vehicles, and also have good social and economic benefits.

Referring to Fig. 1, the device for measuring the internal resistance of the bench based on the reaction force roller brake test bench according to the present invention includes: force and force measurement device A, fixing device B, reaction force roller brake test bench C, Tire suspension device D. Among them, the tire suspension device D is linked with the force application and force measurement device A through a hinge, and the force application and force measurement device A is fixed on the fixing device B through bolt connection, and the fixing device B is fixed on the reaction roller brake test through bolt connection. On stage C.

Referring to Fig. 2, the force application and force measurement device A in the device for measuring the internal resistance of the bench based on the reaction force roller brake test bench according to the present invention includes: a force application handle 1, a lead screw 2, a base 3, a slide Block 4, connecting piece 5, force sensor 6, guide block 7, connecting piece 8, support frame 9, hinge 10, lower connecting piece 11, upper connecting piece 12, connecting pin 13. The force-applying handle 1 is connected with the lead screw 2 through a key, and the lead screw 2 and the base body 3 are threaded. The connecting piece 5 and the connecting piece 8 have the same structure, and the force sensor 6 is connected to the slider 4 through the connecting piece 5, wherein the specification of the force sensor 6 is an S-type tension pressure sensor, and the magnitude of each applied force can be determined by the S-type standard tension pressure sensor. The measuring instrument of the sensor measures directly. The lead screw 2 and the connecting piece 5 transmit force through the slider 4, the slider is connected with the substrate through the guide block 7, and the slider moves on the substrate longitudinally along the guide block. Turning the force application handle 1 drives the lead screw 2 to move, causing the slider 4 to be displaced, and the force is transmitted to the force sensor 6 through the connecting piece 5, and the force application can be measured.

Referring to Fig. 3, the fixing device B in the device for measuring the internal resistance of the bench based on the reaction force roller brake test bench according to the present invention includes: a connecting plate 14, a screw 15, a connecting sleeve 16, a screw 17, a tight Fixed bolt 18, bolt hole 19, base plate 20. The connection plate 14 is connected with the base body 3 in the force application and force measuring device A through bolts, and the lead screw 15 and the lead screw 17 have the same structure and are connected through the connection sleeve 16 . The distance between the lead screw 15 and the lead screw 17 can be shortened or increased by rotating the connecting sleeve 16, so that the angle of force application and force measurement can be changed. The leading screw 15 is connected with the connecting plate 14 by a hinge, and the bottom plate 20 is fixed on the frame of the reaction force drum brake test stand C by bolts. The main function of the fixing device B is to strengthen the suspension tire model D and the counter force roller brake test bench C, so as to prevent the deviation of mechanical fit during the calibration process.

Referring to Fig. 4, the reaction force roller brake test stand C in the device for measuring the internal resistance of the bench based on the reaction force roller brake test stand according to the present invention is a reaction force type produced by Chengdu Chengbao Development Co., Ltd. Roller brake test bench, model is FZ-10C. The present invention adopts the simplified model of the counterforce type drum brake test bench and mainly includes: a frame 21 , a sprocket 22 , a driven drum 23 , a third drum 24 , and a driving drum 25 . The driven roller 23 and the driving roller 25 are fixed on the frame through bearings, and are connected through the sprocket 22 .

Referring to Fig. 5, the tire suspension device D in the device for measuring the internal resistance of the bench based on the reaction force roller brake test bench according to the present invention includes: a piston rod 26, a damping spring 27, a supporting seat ring 28, a damping Vibrator 29, lower arm 30, fastening bolt 31, ball seat 32, universal steering knuckle 33, brake disc 34, tire 35, brake caliper 36, ball seat 37, ball seat 38, upper swing arm 39, fastening nut 40, fastening nut 41, fastening bolt 42, fastening bolt 43, ball stud 44.

Wherein piston rod 26, damping spring 27, support seat ring 28 and shock absorber 29 have constituted damping system, and the top of piston rod 26 is the cylinder of height 40mm, wall thickness 5mm, internal diameter 30mm, and this cylinder and implement The force and the connecting piece 8 in the force measuring device A are coaxially matched. When pressure is applied, the pressure acts on the lower swing arm 30 through the piston rod 26 to truly simulate the real wheel weight of the car. The shock absorber 29 is hingedly connected with the lower swing arm 30, and the inner ends of the lower swing arm 30 and the upper swing arm 39 are hingedly connected with the base body 3 in the force application and force measuring device A, and the outer ends of the two are connected to each other through ball studs 44 and The universal steering knuckle 33 is connected. The lower swing arm 30 is fixedly connected to the ball socket 32 through the fastening bolt I41 and the fastening bolt II42. The ball socket 32 is connected to the universal steering knuckle 33 through the ball stud 44. The connection method of the upper swing arm 39 is the same as that of the lower swing arm. 30 are connected in the same way.

Referring to Fig. 6, the schematic diagram of the data acquisition system in the bench internal resistance measuring device based on the reaction force roller brake test bench of the present invention includes: an analog signal amplification terminal board 45, an analog acquisition card 46, an industrial computer 47. The analog signals of the left and right internal resistances of the bench are first amplified through the amplifying wiring board 45 , and then the processed signals are collected through the analog acquisition card 46 , and finally the corresponding bench internal resistance value is obtained in the industrial computer 46 .

The working principle of the experimental device of the present invention:

For vehicles with different axle loads, the corresponding axle load is applied by adjusting the force and force measuring device A, and then the force is transmitted to the tire suspension device D through the connecting device to simulate the axle load in the actual inspection process of the car. The length of the lead screw can be adjusted by adjusting the connecting sleeve between the two lead screws in the fixing device B, and the tire in the tire suspension device D can be connected to the reaction force roller brake test bench C by adjusting the angle of the lead screw. The roller sets are in vertical contact.

Based on the test bench internal resistance measurement method based on the reaction force roller brake test bench:

Before the reaction roller brake test bench is put into use, it is necessary to calibrate the internal resistance of the test bench. The obtained calibration value is a fixed value, but in the actual testing process, the internal resistance of the bench will be different due to the difference in the axial load. Changes, the measuring device for the internal resistance of the bench established in the present invention can calibrate the internal resistance of the bench under different axial loads, and perform error compensation on the braking force results, so that the detected braking force value is more accurate.

Bench internal resistance measuring method of the present invention comprises following several specific steps:

(1) Fix and assemble the adjusting force applying and force measuring device A, the fixing device B, the counter force roller brake test stand C and the tire suspension device D according to the connection relationship described in Fig. 1 according to the present invention, Make sure that the surface of the tire is in vertical contact with the surface of the roller group of the brake test bench, zero-adjust the force sensor 6, and adjust the force-applying handle 1 in the force-applying and force-measuring device A, so that the force on the force sensor 6 is zero;

(2) Rotate the force application handle 1, read the indication of the force sensor 6, gradually increase the axial load in units, start the drive motor, drive the roller group and the tire to rotate, and obtain the value of the retarding force through the data acquisition system, that is, is the value of the internal resistance of the bench under the axial load (denoted as F _x ).

The data of the internal resistance of the bench and the axle load are collected, and the data obtained are fitted by the least square method to determine the correlation between the internal resistance of the bench and the axle load of the vehicle. Through this relationship, the internal resistance value F _x of the bench during the detection process of vehicles with different axle loads can be obtained, and the measured braking force value during the detection process is F, then (FF _x ) is the internal resistance of the bench removed The actual braking force can be used to compensate the error of the braking force result to make the detection result more accurate.

Claims (3)

1. a kind of stand internal resistance measurement device based on anti-force type drum braking check-out console, mainly by force and force measuring device (A), fixing device (B), anti-force type drum braking check-out console (C) and tire draft hitch (D) composition it is characterised in that：

Described tire draft hitch (D) is passed through hinge and is linked with force and force measuring device (A), exerts a force and force measuring device (A) it is bolted and is fixed in fixing device (B), described fixing device (B) is bolted and is fixed on anti-force type On the stand of drum braking check-out console (C)；In described force and force measuring device (A), force handle (1) is passed through with leading screw (2) Bonded, leading screw (2) and matrix (3) adopt screw thread to coordinate, and leading screw (2) and connector I (5) carry out the biography of power by slide block (4) Pass, slide block (4) is connected with matrix (3) by guide pad (7), and is vertically moved on matrix (3) along guide pad (7), Force transducer (6) is connected with slide block (4) by connector I (5).

2. the stand internal resistance measurement device based on anti-force type drum braking check-out console according to claim 1, its feature exists In：

In described fixing device (B), the matrix (3) in connecting plate (14) and force and force measuring device (A) is by bolt even Connect, leading screw (15) is identical with leading screw (17) structure and is attached by adapter sleeve (16), and leading screw (17) is passed through with base plate (20) Chain connection, in base plate (20) and the frame being bolted on anti-force type drum braking check-out console (C).

3. a kind of measuring method of the stand internal resistance based on anti-force type drum braking check-out console it is characterised in that：

Force and device for measuring force (A) are adjusted by rotation urging handle (1), imposed load is in tire draft hitch (D), thus mould Intend automobile axle load；

Counter-force Roller brake tester cylinder group drives the value reading force transducer (6) instrument in tire rotation process, obtains mould Intend axle load, and record the internal resistance value F of stand according to counter-force Roller brake tester data collecting system in real time_x, set up axle and carry Lotus and stand internal resistance incidence relation.