1. Carefully observe the workmanship

The workmanship of a controller reflects the strength of a company. Under the same conditions, the workshop controller is definitely not as good as the products of large companies; the hand-soldered product is definitely not as good as the wave soldered product; the exquisite appearance of the controller is worse than the product that does not pay attention to the appearance; A thick controller is better than a controller that cuts corners and materials; a controller with a heavy radiator is better than a controller with a light radiator, etc. Companies that are pursuing materials and processes have relatively high credibility, which can be seen by comparison. 

2. Contrast temperature rise

Use the newly delivered controller and the original controller to conduct a heat blocking and forwarding test under the same conditions. Both controllers remove the radiator, use a car, prop up the foot, and first turn the handle to reach the highest speed. Brake, do not brake to death, lest the controller enters the stall protection, maintain at a very low speed for 5 seconds, release the brake, quickly reach the highest speed, then brake, repeat the same operation, such as 30 times, check the highest temperature of the radiator point.

Compare the data of the two controllers, the lower the temperature the better. The test conditions should ensure the same current limit, the same battery capacity, and the same car, starting the test from a cold car, maintaining the same braking force and time. At the end of the test, check the tightness of the screws that fix the mos. The more loose it is, the worse the temperature resistance of the insulating plastic particles is. In long-term use, this will cause the mos to be damaged due to heat in advance. Then install the radiator, repeat the above test, and compare the radiator temperature, which can investigate the heat dissipation design of the controller.

3. Observe the back pressure control ability

Choose a car with a higher power, unplug the battery, choose a charger to power the electric car, and connect the e-abs enable terminal to ensure that the brake lever switch is in good contact. Rotate the handle slowly. Too fast the charger will not output a large current, which will cause undervoltage, which will allow the motor to reach the highest speed and brake quickly. Repeatedly, there should be no mos damage.

When braking, the voltage at the output terminal of the charger will rise rapidly, which tests the instantaneous voltage-limiting ability of the controller. This test is basically ineffective if it is tested with a battery. This test can also be carried out on a fast downhill, and brakes when the car reaches the highest speed.

4. Current control ability

Connect a fully charged battery. The larger the capacity, the better. First, let the motor reach the highest speed. Select two motor output lines to short-circuit, and repeat it for more than 30 times. There should be no mos damage; then let the motor reach the highest speed. An optional motor wire is short-circuited and repeated 30 times. This is more severe than the above test. The internal resistance of one mos is missing in the loop, and the instantaneous short-circuit current is larger, which tests the rapid current control ability of the controller.

Many controllers will make a fool of yourself in this link. If there is damage, you can compare the number of times the two controllers successfully withstand the short circuit. , Quickly connect another motor wire, the motor should be able to rotate immediately, and one of the motor wires should be plugged and unplugged repeatedly while the motor is rotating, and the controller should work normally. This part of the experiment can verify the reliability design of the controller software and hardware.

5. Check the efficiency of the controller

Turn off the speeding function. If available, test the maximum speeds reached by different controllers in the same car with no load. The higher the maximum speed, the higher the efficiency and the higher the cruising range.