1. Observe the workmanship carefully
The workmanship of a controller reflects the strength of a company. Under the same conditions, workshop controllers are definitely not as good as products from large companies; hand-soldered products are definitely not as good as wave-soldered products; controllers with exquisite appearance are worse than products that do not pay attention to appearance; wires A controller with thick wires is worse than a controller with cut corners; a controller with a heavy radiator is worse than a controller with a light radiator, etc. Companies that pursue materials and processes have relatively high credibility, and you can see this through comparison come out.
2. Comparative temperature rise
Use the newly sent controller and the original controller to conduct a blocked heat test under the same conditions. Remove the radiator of both controllers, use a car to prop up your feet, first turn the handle to reach the highest speed, and immediately Brake, do not brake to prevent the controller from entering stall protection, maintain at extremely low speed for 5 seconds, release the brake, quickly reach the highest speed, brake again, repeat the same operation, such as 30 times, to detect the maximum temperature of the radiator point.
Comparing 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, the same vehicle, the same test starting from a cold car, and maintaining the same braking force and time. At the end of the test, the tightness of the screws fixing the MOS should be checked. The looser the screws, the worse the temperature resistance of the insulating plastic particles used. In long-term use, this will cause the MOS to be damaged due to heat in advance. Install the radiator again, repeat the above test, and compare the radiator temperature. This can examine the heat dissipation design of the controller.
3. Observe the back pressure control ability
Select a car, the power can be higher, unplug the battery, use a charger to power the electric car, connect the E-ABS enable terminal, and ensure that the brake switch is in good contact. Turn the handle slowly. If it is too fast, the charger will not be able to output a large current, which will cause under-voltage and allow the motor to reach the highest speed. Apply the brake quickly and repeat it many times. MOS damage should not occur. When braking, the voltage at the output of the charger will rise rapidly, testing the controller's instantaneous voltage limiting capability. This test is basically ineffective if tested with a battery.
4. Current control capability
Connect a fully charged battery. The larger the capacity, the better. First, let the motor reach the highest speed. Short-circuit any two motor output lines. Repeat this for more than 30 times. There should be no MOS damage. Then let the motor reach the highest speed. Connect the positive and negative terminals of the battery to the battery. Optional - One motor wire is short-circuited, repeated 30 times to test the controller's rapid control capability. Many controllers will make a fool of themselves in this link. If damage occurs, you can compare the number of times the two controllers successfully withstood short circuits. The fewer, the worse. This part of the experiment can verify the reliability design of the controller software and hardware.
5. Check controller efficiency
Turn off the overspeed function, if available, and test the maximum speed reached by different controllers in the same car without load. The higher the speed, the higher the efficiency and the higher the cruising range.
The above tests were all conducted without any special equipment and are highly operable. The extensive comparison of the differences in workmanship, temperature rise, voltage and current control and efficiency of the controller can basically reflect the advantages and disadvantages of the controller. When consumers purchase electric vehicle controllers, they may wish to choose the above experimental methods according to the situation and choose a more reliable electric vehicle controller.