Bicycle braking performance testing machine

Pc-controlled bicycle braking performance comprehensive testing machine WSD-8717C

First, the machine is used to simulate the riding environment test of electric vehicles, the assembled finished car is placed on the machine, set the load weight, adjust the safety device, set the relevant parameters on the computer (such as: riding speed, braking mode, load, etc.), the computer automatically performs the test.

Second, the test principle:

1. EN15194-20174.3.5.9 Brake performance

2. Brake performance of GB3565-2022

3. ISO4210-2015(E) Brake performance

(a) Front brake test (b) rear brake test

Iii. Test method:

1. Brake surface running-in test: fix the electric vehicle on a special machine and increase the weight, drive the bicycle to the specified speed, apply the operating force on the brake handle or pedal, until the operating force can make the braking force reach 200N±10%. Maintain this force for at least 2.5s and record, repeat this procedure (applying the above measured operating force ±5%) 10 times, or more times if necessary, until the average brake force in any of the last 3 tests deviates from the average brake force in these 3 tests by no more than ±10%

2. Dry braking performance test:

1) For hand-operated brakes, apply a vertical force on the electric vehicle sufficient to prevent the tire from slipping on the roller, accelerate the drive mechanism to the specified speed, apply a series of operating forces in 20N increments from 40N to 180N or reach the required operating force of at least 700N braking force, which is the smaller of the two. However, if the wheel is locked, any possible brake overload device is activated, or the brake handle is in contact with the handlebars, the operating force is not increased. For each operating force, three tests should be performed within 1 minute. Allow the brakes to cool for 1min before applying the next operating force.

2) For each incremental operating force, the braking force F shall be recorded from 0.5s to 1.0s from the braking starting point for a period of 2.0s to 2.5s. To record the average braking force during this measurement

3) The time to start measuring the braking force is related to the speed at which the operating force is applied. If the operating force reaches the specified value within 0.5s after the braking starting point, the braking force will be measured after 0.5s from the braking starting point. However, if the operating force reaches the specified value between 0.5s and 1.0s after the start of the braking point, the measurement begins after the operating force reaches the specified value

3. Wet braking performance test: The test method is the same as dry braking performance test. In addition, the sprinkler system should be started no less than 5S before braking to spray the brake system, and continue to spray water until the end of the test cycle.

4. Brake force correction: Each recorded brake force F should be corrected due to the difference between the recorded operating force and the predetermined operating force. The corrected brake force is equal to the recorded brake force F multiplied by a correction factor, which is the ratio of the predetermined operating force to the recorded operating force. Such as:

Record the braking force FBr rec=225N

Fop intend=180N

Record operating force Fop rec=184N

Correction factor =180/184

Revised braking force FBrcorr=225× (180/184)

Test results: The maximum output braking force FBr max for each set of wheels (front or rear) and each test condition (wet or dry) is selected from the records

Braking performance is calculated according to the following formula: =×

Formula:

Bp: Brake performance value (N)

FBr max: Maximum FBr average (N)

m: EPAC standard quality, adult car 100kg

M: Maximum allowable total mass (kg) specified by the manufacturer

5. Linearity: Use (the arithmetic average of the brake force after 3 corrections for each operating force) and the corresponding predetermined operating force to plot, and use linear regression to find the best fitting line, and refer to the minimum square method to get the upper and lower limits of ±20% to evaluate the linearity requirements.

6. Heat resistance test:

1) Drive the wheel and tire group with brakes back to 12.5km/h±5%, plus 12.5km/h±10% of the cold air blowing back, so that the total brake can reach the specified power hour E (Wh) 5%, this test should be continued for (15±2) min. Allow the brake to cool to room temperature and repeat its test cycle.

2) A maximum of 10 discontinuities are allowed in each test cycle, and the maximum duration of each discontinuance is 10s

3) When the test is performed, apply the brake to dry and wet brake performance etc. on the components tested. Braking energy is calculated according to the following formula.

= x (ℎ)

Where, FBr: Braking force (N)

VBr: Tire circumferential speed (m/s) (12.5km/h=3.472m/s)

T: Duration of each test cycle (h) (without interruption) (15min=0.25h)

Total braking performance, E=75Wh

7. All test results can be freely saved, independent report format, free to print reports.

8. Standard linear reference:

Fourth, computer: brand computer DELL or Lenovo equivalent products

OPERATINGSYSTEM: The latest dedicated bicycle brake performance test software under WINDOWS XP, the software itself contains detailed operating instructions, and a set of detailed operating instructions are attached. The computer can be compatible with OS/2, NOVELL, UNIX, WINDOWS NT and other networks and multi-users, and the operating system is suitable for various software packages compatible with the PC.

List machine: HP list machine, can automatically print a variety of reports, can automatically print the following curves and reports:

(1) Speed-time test curve

⑵ Braking distance - time curve

(3) Braking force - time test curve

⑷ Acceleration/deceleration - time test curve

(5) Brake work-time test curve

V. Technical parameters:

1) Force sensor: 500N

2) Force accuracy: ≤1%

3) Sensor resolution: 1/100,000

4) Riding speed: 0-15km /Hr adjustable

5) Speed measurement accuracy: ≤1%

6) Distance measurement accuracy: ≤1%

7) Adjustable distance between the front and rear axes of the machine: 600-1200mm

8) Grip force: 40N, 60,...... 180N can be set

9) Brake force control: closed-loop control

10) Brake grip time: 0-300s can be set

11) Brake grip release time: 0-60 minutes 60 seconds can be set

12) Braking times: 0-999,999 can be set

13) Spray system: flow control ≥4ml/s, front and rear brake independent distribution

14) Tire burst: automatic detection

15) Overload shutdown: automatic detection

16) Drum diameter: ≥Φ260MM

17) Load loading mode: cushion loading

18) Brake mode: pneumatic automatic loading

19) Grip force display mode: computer digital display

20) Brake force display mode: computer digital display

21) Brake force control mode: computer servo control

22) Brake: single wheel

23) Brake work: computer automatic display

24) Power supply: 5KW 380V 50Hz

Six, equipment details:

1) One host

2) Computer host and a printer

3) One control cabinet

5) Other accessories: several pneumatic components.

6) A copy of the manual

7) One certificate of qualification