The importance of the controller to electric vehicles is self-evident. It is like the heart and brain of an electric car, maintaining the basic operation of the electric car. The quality of the controller can ensure the normal operation of the electric vehicle, and can also ensure the safety of the user to the utmost extent.
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However, the poor quality electric vehicle controller is like laying a time bomb for the electric vehicle, which poses a greater threat to the safety of the driver. So, how do we judge the pros and cons of the electric vehicle controller?
Although the controller is not so intuitively visible in the buyer's view, we can still observe the condition of the electric vehicle controller from different angles. Here are a few ways that don't require a lot of equipment and are easy to manipulate.
1, carefully observe the work
The workmanship of a controller reflects the strength of a company. Under the same conditions, the controller of the workshop is definitely not as good as that of a large company; the products welded by hand are definitely not as good as the products soldered by the wave solder; the controller with exquisite appearance is better than the product that does not pay attention to the appearance; The controller with the thicker is better than the controller for the wire cut-off; the controller of the radiator is better than the controller of the radiator, etc. The company that pursues the materials and process has high relative credibility, and the comparison can be seen. .
2, contrast temperature rise
Use the newly sent controller and the original controller to perform the blocking heat transfer test under the same conditions. Both controllers remove the radiator, use a car, prop up the foot, and turn the turn to reach the highest speed immediately. Brake, do not brake, lest the controller enter the stall protection, maintain it at very low speed for 5 seconds, release the brake, quickly reach the highest speed, brake again, repeat the same operation, such as 30 times, check the maximum temperature of the radiator point.
Take the data comparison 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, maintaining the same braking force and time. At the end of the test, check the tightness of the screws of the fixed MOS. The more loose the insulation, 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. Then install the heat sink, repeat the above test, compare the heat sink temperature, this can examine the heat dissipation design of the controller.
3. Observe the ability of back pressure control
Select a car, the power can be larger, unplug the battery, use the charger to supply power to the electric car, connect the E-ABS enable terminal to ensure that the brake switch is in good contact. Slowly turn the handle, too fast, the charger can not output a large current, it will cause undervoltage, let the motor reach the highest speed, fast braking, repeated many times, there should be no MOS damage.
When braking, the voltage at the output of the charger will rise rapidly, and the instantaneous voltage limiting capability of the controller will be tested. This test has no effect if it is tested with a battery. This test can also be carried out during a fast downhill trip and brakes when the car reaches its maximum speed.
4, current control capability
Connect the full battery, the larger the better the better, let the motor reach the highest speed first, optionally the two motor output lines are short-circuited, repeated, more than 30 times, there should be no MOS damage; let the motor reach the highest speed, with the battery positive and An optional motor line is short-circuited and repeated 30 times. This is more severe than the above test. There is one internal resistance of the MOS in the loop, and the instantaneous short-circuit current is larger, which tests the controller's current fast control capability.
Many controllers will be ugly in this process. If there is damage, you can compare the number of times the two controllers successfully withstand the short circuit, the less the worse; unplug one motor line, pull the handle to the maximum, the motor will not run. , quickly connect another motor line, the motor should be able to rotate immediately, and one of the motor wires is repeatedly inserted and removed during the motor rotation, and the controller should work normally. This part of the experiment can verify the reliability design of the controller software and hardware.
5, test controller efficiency
Turn off the overspeed function, if any, test the highest speed reached by different controllers under the same load of the same car. The higher the speed, the higher the efficiency and the higher the cruising range. The above tests are carried out without any special equipment, and the operability is strong. The difference between the workmanship, temperature rise, voltage and current control and efficiency of the controller is widely compared, which can basically reflect the advantages and disadvantages of the controller. When consumers purchase electric vehicles, they may wish to choose the above experimental methods according to the situation and purchase more reliable electric vehicles.
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