CN106404264B - Device and method for measuring internal resistance of bench based on reaction-force drum brake inspection bench - Google Patents

Abstract

The invention relates to a device and method for measuring the internal resistance of a bench based on a reaction-force drum brake inspection bench. The device is mainly composed of a force application and force measurement device (A), a fixing device (B), a reaction-force drum brake inspection table (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), a load is applied to the tire suspension device (D), so as to simulate the wheel load in the actual vehicle inspection process, and obtain different The internal resistance value of the gantry under the wheel load is used to establish the relationship between the internal resistance of the gantry and the axle load. For different models, the corresponding bench internal resistance F _x is determined according to different axle loads, and the error compensation is performed on the braking force to improve the detection accuracy. The device can be widely used in automobile inspection, testing and scientific research institutions.

Description

A device and method for measuring the internal resistance of a bench based on a reaction-force drum brake inspection bench

technical field

The invention relates to a vehicle detection device and method, in particular to a bench internal resistance measurement device and method based on a reaction-force drum brake inspection bench.

Background technique

The braking performance of a vehicle is directly related to the driving safety of the vehicle, and it is one of the items that must be checked for the safety performance of the vehicle. The brake test bench is often used to test the braking performance. At present, the braking test equipment used in the domestic vehicle performance testing station is mostly reaction force Type roller brake test bench. The test principle is: the wheel to be tested is placed between the main and driven rollers, and the third roller is pressed down to make the proximity switch turn on. The motor is started through the delay circuit, and the wheel is driven to rotate at a low speed through the reducer, chain drive and the main and driven rollers. After the wheel speed is stable, the driver steps on the brake pedal. The friction torque of the wheel brake is transmitted to the drum through the tire and becomes the force of the tire on the drum. At the same time, the roller has a reaction force on the tangential direction of the tire periphery to overcome the friction torque of the brake and maintain the wheel to continue to rotate. Due to the existence of the acting force, the reducer housing and the force measuring lever swing together in the opposite direction of the rotation of the drum. 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 a pointing device or a printer.

At present, in the process of detecting the reaction force on the drum test bench, the drive motor will drive the drum set and other rotating parts of the test bench to move together. During the movement, the friction between the rotating parts will have energy. Losses, including friction losses between the tire and the drum and friction losses between the drive system inside the test bench. Among them, the friction loss generated inside the test bench is the internal resistance of the bench. The braking force of the vehicle detected in the detection process also includes the resistance of this part, resulting in errors in the detection results. Therefore, the internal resistance of the reaction drum brake test bench should be determined and calibrated before it is put into use 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 calculated by the law of kinetic energy conservation in the sliding method is usually a fixed value. Therefore, there is a large error in the sliding method.

SUMMARY 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 bench during the detection process of the reaction-force drum brake test bench for vehicles with different axle loads. Provided are a device and method for measuring the internal resistance of a bench based on a reaction-force drum brake test bench. By measuring the value of the bench internal resistance under different axle loads, the relationship between the bench internal resistance of the reaction-force drum brake test bench and the vehicle axle load is determined, and the error compensation is performed on the braking force results, so that the detection results can be improved. more precise.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions to realize:

A bench internal resistance measurement device based on a reaction-force drum brake test bench is mainly composed of a force application and force measurement device A, a fixing device B, a reaction-force drum 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, and 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 bench C of the type drum brake inspection bench C; in the force application and force measurement device A, the force application handle 1 and the lead screw 2 are connected by a key, the lead screw 2 and the base body 3 are threaded, and the lead screw 2 is connected to the The component I5 transmits the force through the sliding block 4, the sliding block 4 is connected with the base body 3 through the guide block 7, and moves longitudinally on the base body 3 along the guide block 7, and the force sensor 6 is connected with the sliding block 4 through the connecting piece I5.

In the fixing device B, the connecting plate 14 and the base body 3 in the force applying and 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, and the lead screw 17 is connected with the bottom plate 20. Connected by hinges, the bottom plate 20 is fixed on the frame of the reaction drum brake inspection stand C by bolts.

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

During the rotation of the tires by the roller group of the reaction roller brake test bench, the value of the force sensor 6 meter is read to obtain the simulated axle load, and the internal resistance value of the bench is measured in real time according to the data acquisition system of the reaction roller brake test bench F _x , establishes the relationship between the shaft load and the internal resistance of the gantry.

Compared with the 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-type drum brake test bench. The obtained calibration value is a fixed value. In the actual detection process, the internal resistance of the bench will be affected by the shaft load. The measurement device for 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 result of the braking force.

2. The bench internal resistance measuring device based on the reaction-force drum brake test bench according to the present invention has the advantages of simple structure, convenient operation, small occupied space, low cost and high detection accuracy, and can be accurately simulated by adjusting the force applying device The magnitude of different axle loads does not need to be calibrated with a real vehicle. In the calibration process, only the device needs to be used to determine the value of the bench internal resistance of vehicles with different axle loads during the detection process.

Description of drawings

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

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

projection map;

Fig. 2a is the bench internal resistance measurement device based on the reaction-force drum brake test bench according to the present invention

Axonometric projections of force application and force measurement devices;

Fig. 2b is a partial enlarged view of Fig. 2a;

Fig. 3 is the bench internal resistance measuring device based on the reaction-force drum brake test bench according to the present invention

Axonometric projection of the fixture;

Fig. 4 is in the bench internal resistance measuring device based on the reaction-force drum brake test bench according to the present invention

Schematic diagram of the simplified model of the reaction drum brake inspection bench;

Fig. 5a is the bench internal resistance measurement device based on the reaction-force drum brake test bench according to the present invention

Axonometric projection of tire suspension device;

Fig. 5b is a partial enlarged view of Fig. 5a;

Fig. 6 is in the bench internal resistance measuring device based on the reaction-force drum brake test bench according to the present invention

Schematic diagram of the data acquisition system.

In the picture: A. Force application and force measurement device, B. Fixing device, C. Simplified model of reaction drum brake test bench, D. Tire suspension device, 1. Force application handle, 2. Lead screw I, 3 .Base 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. Frame, 22. Chain, 23. Driven Roller, 24. Third Roller, 25. Drive Roller, 26. Piston Rod, 27. Shock Spring, 28. Support Race, 29. Shock Absorber, 30. Lower Swing Arm, 31. Tight 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 stud, 45. Analog signal amplification terminal board, 46. Analog acquisition card, 47 . Industrial computer.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in detail:

The invention provides a device and method for measuring the internal resistance of a bench based on a reaction-force drum brake test stand, which can improve the accuracy of vehicle braking performance detection. The study of vehicle braking performance has high social value and extensive social significance. It has a good promotion effect on the safe operation, riding comfort and stability of the vehicle, as well as good social and economic benefits.

Referring to Fig. 1, the device for measuring the internal resistance of the bench based on the reaction-force drum brake test bench according to the present invention includes: a force application and force measurement device A, a fixing device B, a reaction-force drum brake test bench C, 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 bolts, and the fixing device B is fixed on the reaction-force drum brake test by bolting. 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 drum brake inspection bench according to the present invention includes: a force application handle 1, a lead screw 2, a base body 3, a sliding 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 and the lead screw 2 are connected by a key, and the lead screw 2 and the base body 3 are threaded. The structure of the connector 5 and the connector 8 is the same. The force sensor 6 is connected to the slider 4 through the connector 5. The specification of the force sensor 6 is an S-type tension pressure sensor, and the size of each applied force can be determined by the S-type standard tension pressure The measuring instrument of the sensor measures directly. The lead screw 2 and the connecting piece 5 transmit force through the sliding block 4, the sliding block is connected with the base body through the guide block 7, and the sliding block moves on the base body along the longitudinal direction of the guide block. Rotate the force application handle 1 to drive the lead screw 2 to move, so that the slider 4 is displaced, and the force is transmitted to the force sensor 6 through the connector 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 drum brake inspection bench according to the present invention includes: a connecting plate 14, a lead screw 15, a connecting sleeve 16, a lead screw 17, a tightening Fastening bolts 18, bolt holes 19, bottom plate 20. The connecting plate 14 and the base body 3 in the force applying and force measuring device A are connected by bolts, and the lead screw 15 and the lead screw 17 have the same structure and are connected by a connecting sleeve 16 . By rotating the connecting sleeve 16, the distance between the lead screw 15 and the lead screw 17 can be shortened or increased, so that the angle of force application and force measurement can be changed. The lead screw 15 and the connecting plate 14 are connected by hinges, and the bottom plate 20 is fixed on the frame of the reaction-force drum brake inspection stand C by bolts. The main function of the fixing device B is to strengthen the suspension tire model D and the reaction drum brake test bench C, and prevent the deviation of mechanical coordination during the calibration process.

Referring to Fig. 4, the reaction-force drum brake inspection bench C in the device for measuring the internal resistance of the bench based on the reaction-force drum brake inspection bench of the present invention is the reaction-force type drum produced by Chengdu Chengbao Development Co., Ltd. Drum brake inspection bench, model FZ-10C. The present invention adopts the simplified model of the reaction-force drum brake inspection table, which mainly includes: a frame 21 , a sprocket 22 , a driven drum 23 , a third drum 24 , and a driving drum 25 . The driven drum 23 and the driving drum 25 are fixed on the frame through bearings and 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 drum brake test bench according to the present invention includes: a piston rod 26, a damping spring 27, a support seat 28, a reducing Shock 29, Lower Swing 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. Tighten the nut 40, tighten the nut 41, tighten the bolt 42, tighten the bolt 43, and the ball stud 44.

The piston rod 26, the shock-absorbing spring 27, the support seat ring 28 and the shock absorber 29 constitute a shock-absorbing system. The top of the piston rod 26 is a cylinder with a height of 40mm, a wall thickness of 5mm and an inner diameter of 30mm. The connecting piece 8 in the force and force measuring device A is coaxially matched, and when pressure is applied, the pressure acts on the lower swing arm 30 through the piston rod 26, which truly simulates the real wheel weight of the car. The shock absorber 29 is hingedly connected with the lower swing arm 30, 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 measurement device A, and the outer ends of the two are respectively connected with the ball stud 44. The universal steering knuckle 33 is connected. The lower swing arm 30 and the ball joint seat 32 are fixedly connected by fastening bolts I41 and II42, the ball joint seat 32 and the universal steering knuckle 33 are connected by ball joint pins 44, and the connection method of the upper swing arm 39 is the same as that of the lower swing arm. 30 is connected in the same way.

Referring to FIG. 6, the principle diagram of the data acquisition system in the bench internal resistance measurement device based on the reaction-force drum brake test bench according to 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 gantry are first amplified and processed by the amplifying wiring board 45 , and then the processed signals are collected by the analog acquisition card 46 , and finally the corresponding internal resistance value of the gantry is obtained in the industrial computer 46 .

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

For cars with different axle loads, the corresponding axle loads are applied by adjusting the force application 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 during the actual inspection process of the car. In the fixing device B, the length of the lead screw can be adjusted by adjusting the connecting sleeve between the two lead screws, and by adjusting the angle of the lead screw, the tire in the tire suspension device D and the reaction drum brake test bench C can be adjusted. The roller groups are in vertical contact.

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

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

The bench internal resistance measurement method of the present invention includes the following specific steps:

(1) Fix and assemble the adjusting force application and force measuring device A, the fixing device B, the reaction-force drum 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 tire surface is in vertical contact with the surface of the roller group of the brake inspection table, 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 of the force sensor 6 is zero;

(2) Rotate the force application handle 1, read the indication of the force sensor 6, gradually increase the axle load with a unit amount, start the driving motor, drive the roller group and the tire to rotate, and obtain the value of the blocking force through the data acquisition system, that is, is the value of the internal resistance of the gantry under the load of the shaft (denoted as F _x ).

Collect the data of the internal resistance of the bench and the axle load, and use the least squares method to fit the obtained data 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 recorded as F, then (FF _x ) is the removal of the internal resistance of the bench. The actual braking force can be compensated for the error of the braking force result, so that the detection result is more accurate.

Claims (2)

1. The utility model provides a rack internal resistance measuring device based on counter-force formula cylinder braking checkout stand, mainly comprises application of force and power measuring device (A), fixing device (B), counter-force formula cylinder braking checkout stand (C) and tire suspension device (D), its characterized in that:

the tire suspension device (D) is connected with the force application and force measurement device (A) through a hinge, the force application and force measurement device (A) is fixedly connected onto the fixing device (B) through a bolt, and the fixing device (B) is fixedly connected onto a rack of the counter-force roller braking inspection bench (C) through a bolt; in the force application and force measurement device (A), a force application handle (1) is connected with a lead screw I (2) through a key, the lead screw I (2) is in threaded fit with a base body (3), the lead screw I (2) and a connecting piece I (5) transmit force through a sliding block (4), the sliding block (4) is connected with the base body (3) through a guide block (7) and moves longitudinally on the base body (3) along the guide block (7), and a force sensor (6) is connected with the sliding block (4) through the connecting piece I (5);

the tire suspension device (D) is hinged with the base body (3) in the force application and force measurement device (A) through the inner ends of the upper swing arm (39) and the lower swing arm (30), a piston rod (26), a damping spring (27), a support seat ring (28) and a damper (29) in the tire suspension device (D) form a damping system, the damper (29) is hinged with the lower swing arm (30), and when pressure is applied, the pressure acts on the lower swing arm (30) through the piston rod (26), so that the real wheel weight of an automobile is truly simulated;

in the fixing device (B), the connecting plate (14) is connected with the base body (3) in the force application and force measurement device (A) through bolts, the lead screw II (15) and the lead screw III (17) are identical in structure and are connected through a connecting sleeve (16), the lead screw III (17) is connected with the bottom plate (20) through a hinge, and the bottom plate (20) is fixed on a rack of a counter-force type roller braking inspection table (C) through bolts.

2. The measurement method of the rack internal resistance measurement device based on the counter-force type roller brake inspection bench is characterized in that:

the force application and force measurement device (A) is adjusted by rotating the force application handle (1), and load is applied to the tire suspension device (D), so that the axle load of the automobile is simulated;

and in the process that the counter-force roller braking test bed roller group drives the tire to rotate, the value of the instrument of the force sensor (6) is read to obtain the simulated axle load, the internal resistance value of the rack is measured in real time according to the counter-force roller braking test bed data acquisition system, and the incidence relation between the axle load and the internal resistance of the rack is established.

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