QC/T 788-2018Performance requirements and bench test methods for automobile pedal assemblies (English PDF)

3.1 Pedal device

A control mechanism, which is operated by the driver's feet.

3.2 Longitudinal displacement Lp1

The vertical displacement of the pedal, under the action of longitudinal force P1, in both positive and negative directions, perpendicular to the pedal surface and passing respectively.

4.3 Torsion resistance

Pedals and welds shall not be cracked or damaged.

4.4 Strength

The permanent deformation of the pedal device shall not be greater than 5.0 mm, meanwhile there shall be no cracks or damage.

4.5 Working durability

4.5.1 During the working durability test, the pedal device shall not be deformed to affect its function; it shall not have cracks or other abnormal conditions.

4.5.2 After the working durability test, the measured value of the longitudinal displacement of the pedal device shall not be greater than 4.0 mm; the measured value of the lateral displacement shall not be greater than 6.0 mm.

4.6 Vibration durability

4.6.1 After the vibration resistance test, there shall be no deformation affecting the function of the pedal device; there shall be no cracks or other abnormal conditions.

4.6.2 After the vibration resistance test, the measured values of longitudinal displacement and lateral displacement of the pedal device shall meet the requirements of 4.1.1 and 4.1.2, respectively.

4.6.3 For the pedal device with brake light switch or clutch light switch, during the vibration resistance test, the brake light switch or clutch light switch shall not be triggered.

4.7 Corrosion resistance

After the corrosion resistance test, there shall not be more than one corrosion point, which has a diameter greater than 2 mm within any 100 cm² of the outer surface of the sample. Small and scattered corrosion points are allowed, BUT the total area of corrosion shall not exceed 5 cm². Corrosion at weld and thread may not be considered.

5.1 Test equipment

5.1.1 The instrumentation and equipment, which are used in the test, shall meet the requirements of the test conditions of the relevant items; it shall not have an adverse effect on the function of the test sample.

5.1.2 The accuracy grade of the measuring device, which is used for performance test, shall not be lower than 0.5; the accuracy grade of the measuring device, which is used for life test, shall not be lower than 1.5.

5.2 Test conditions

5.2.1 Before the test, the sample shall be preliminarily operated 5 times.

5.2.2 Unless otherwise specified, the test environment temperature is 8 ~ 38 °C.

5.3 Test samples

The number of samples for each test should not be less than 3. Except for the work durability, vibration durability, corrosion resistance tests, the return springs must be removed before the other samples are tested.

6.1 Basic performance

6.1.1 Longitudinal displacement

6.1.1.1 See Figure 4 for the schematic diagram of measuring the longitudinal displacement of the pedal device.

6.1.1.2 Fix the sample to be tested on the test device, according to the state of the real vehicle. The pedal arm is rigidly fixed at the mid-stroke position of the full stroke of the pedal design.

6.1.1.3 Apply a longitudinal force of 20 N ± 2 N, which is perpendicular to the surface of the pedal and passing through the geometric center of the pedal. Keep it for 5 s. Take this position as the zero point of the measurement of the longitudinal displacement of the pedal. Then release the longitudinal force. Reversely apply a longitudinal force of 20 N ± 2 N. After holding for 5 s, measure the longitudinal displacement of the pedal, as relative to the measurement zero point.

6.1.3

6.1.3.2 Pre-apply a longitudinal force of 10 ~ 20 N, at a position perpendicular to the pedal surface and passing the geometric center point of the pedal. Take this position as the zero point of the longitudinal displacement of the pedal.

6.1.3.3 Apply the longitudinal force, which is specified in Table 1, to the pedal device. Hold it for 5 s. Then release the longitudinal force. Carry out 5 cycles in total. Measure and record the longitudinal displacement of the pedal, when the longitudinal force is applied for the fifth time.

6.2 Temperature adaptability

6.2.1 High temperature adaptability

6.2.1.1 Place the tested sample, at an ambient temperature of 80 °C ± 2 °C for 4 hours. Then make the pedal device operate 5 times, under the full stroke at this ambient temperature. Observe whether the pedal has interference, jamming, abnormal noises, in the movement process.

6.2.1.2 After cooling the tested sample to room temperature, measure the longitudinal displacement and lateral displacement, according to 6.1.1 and 6.1.2.

6.2.2 Low temperature adaptability

Except that the ambient temperature is -40 °C ± 2 °C, the rest are the same as 6.2.1.

6.3 Torsional performance

Install the sample to be tested on the test device, according to the state of the actual vehicle. Then, as shown in Figure 6, take the center line of the main welding seam, between the pedal and the pedal lever, as the axis. Apply a rotational torque in both positive and negative directions, which is equivalent to 15 N·m ± 1 N·m, on the pedal.

Then check the welds and the pedal device, for any abnormalities such as cracks or damage.