1, carefully observe the work
The workmanship of a controller reflects the strength of a company, under the same conditions, the workshop controller is certainly not as good as the products of large companies; Hand-welded products are certainly not as good as the products of wave soldering; A well-looking controller is better than a product that doesn't pay attention to appearance; A controller with thick wires is better than a controller with jerry-built wires; A controller with a heavy radiator is better than a controller with a light radiator, etc., and companies that pursue materials and processes have relatively high credibility, and the comparison can be seen.
2. Compare temperature rise
Use the new controller and the original controller to carry out the same conditions of lock-forward heat test, both controllers remove the radiator, use a car, support the foot, first turn the handle to reach the highest speed, immediately brake, do not brake dead, so that the controller into the gridlock protection, maintain at a very low speed for 5 seconds, release the brake, quickly reach the highest speed, and then brake, Repeat the same operation, say 30 times, to detect the highest temperature point of the radiator.
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, the same car, the same test from the cold car, and maintain the same braking force and time. At the end of the test, the degree of tightness of the screws fixing the mos should be checked. The more loose, the worse the temperature resistance of the insulating plastic particles used is indicated. In long-term use, this will cause the mos to be damaged by heat in advance. Then install the radiator, repeat the above test, and compare the temperature of the radiator, which can examine the heat dissipation design of the controller.
3. Observe the reverse pressure control ability
Choose a car, the power can be larger, unplug the battery, choose the charger to power the electric vehicle, connect the e-abs enable terminal, and ensure that the brake switch is in good contact. Slowly turn the handle, too fast the charger can not output a large current, will cause undervoltage, let the motor reach the highest speed, rapid braking, repeated times, there should be no mos damage phenomenon.
When braking, the voltage at the output end of the charger will rise rapidly, testing the instantaneous voltage limiting ability of the controller, and this test has no effect if the battery test is used. This test can also be performed on a fast downhill, when the car reaches the maximum speed and brakes.
4, current control ability
Connect the full battery, the larger the capacity, the better, let the motor reach the highest speed, choose two motor output line short circuit, repeated, more than 30 times, should not appear mos damage; Then let the motor reach the highest speed, short circuit with the positive electrode of the battery and an optional motor line, repeated 30 times, which is more severe than the above test, there is less internal resistance of a mos in the loop, and the instantaneous short circuit current is larger, testing the current fast control ability of the controller.
Many controllers will make a fool of themselves in this link, if there is damage, you can compare the number of successful short-circuit withstand the two controllers, the less the worse; Unplug a motor line, turn the handle to the maximum, at this time the motor will not run, quickly connect another motor line, the motor should be able to rotate immediately, the motor rotation repeatedly plug and unplug one of the motor lines, the controller should work normally. This part of the experiment can verify the reliability design of the controller software and hardware.
5, check the controller efficiency
Turn off the overspeed function, if any, and test the maximum speed achieved by different controllers in the same car with no load, the higher the maximum speed, the more efficient and relatively high mileage.