The importance of the controller to the electric car is self-evident. It is like the heart and brain of the electric car, maintaining the basic operation of the electric car. The high-quality controller can guarantee the normal operation of electric vehicles, and can also ensure the safety of users to the greatest extent.
But the inferior quality electric vehicle controller is like burying a time bomb for electric vehicles, which also poses a greater threat to the driver's safety. So, how do we judge the pros and cons of electric vehicle controllers?
Although the controller is not so intuitively displayed in the buyer's line of sight, we can still observe the status of the electric vehicle controller from different angles. Here are a few methods that do not require many devices and are easy to manipulate.
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 products of manual welding are definitely not as good as the products of wave soldering; the controller with exquisite appearance is better than the product that does not pay attention to appearance; the wire is used A thicker controller is better than a wire-cutting controller; a radiator with a heavy controller is better than a radiator with a lighter controller, etc. Companies that have pursued materials and processes are relatively credible, and the comparison can be seen .
2. Contrast temperature rise
Use the newly sent controller and the original controller to conduct the heat transfer test under the same conditions. Both controllers remove the radiator, use a car, prop up the foot, first turn the handle to reach the highest speed, immediately Brake, don't brake to prevent the controller from entering the locked-rotation protection, maintain it at very low speed for 5 seconds, release the brake, quickly reach the highest speed, then brake, repeat the same operation, such as 30 times, detect the maximum temperature of the radiator point.
Comparing the data from 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, and also start the test from the cold car, 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 more loose it is, the worse the temperature resistance of the insulating plastic particles used. In long-term use, this will cause the MOS to be damaged by heat in advance. Then install the heat sink, repeat the above test, and compare the temperature of the heat sink, which can investigate the heat dissipation design of the controller.
3. Observe the back pressure control capability
Choose a car, the power can be a little bigger, unplug the battery, choose a charger to power the electric car, connect the E-ABS enable terminal, and ensure that the brake lever switch is in good contact. Turn the handle slowly, too fast, the charger can not output a large current, it will cause undervoltage, let the motor reach the highest speed, brake quickly, repeat many times, and there should be no MOS damage.
When braking, the voltage at the output of the charger will rise quickly, testing the instantaneous voltage limiting capability of the controller. This test has basically no effect if tested with batteries. This test can also be carried out when going downhill quickly, and braking when the car reaches the highest speed.
4. Current control capability
Connect a fully charged battery, the larger the capacity, the better, let the motor reach the highest speed first, choose 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, use the battery positive and An optional motor line is short-circuited and repeated 30 times, which is more severe than the above test. The internal resistance of a MOS is less in the loop, and the instantaneous short-circuit current is greater, which tests the controller's rapid current control ability.
Many controllers will be ugly in this link. If there is damage, you can compare the number of times the two controllers successfully withstand the short circuit, the less the worse; pull out a motor wire, pull the handle to the maximum, and the motor will not run at this time , Quickly connect another motor cable, the motor should be able to rotate immediately, and one of the motor cables is repeatedly plugged and unplugged while the motor is rotating, 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 overspeed function, if any, test the maximum speed reached by different controllers under the same vehicle without load. The higher the maximum speed, the higher the efficiency and the higher the cruising range.
The above tests were conducted without any special testing equipment, and the operability is strong. The differences in workmanship, temperature rise, voltage and current control and efficiency of the controller are widely compared, which can basically reflect the quality of the controller. Consumers may wish to choose the above experimental method to detect according to the specific situation when purchasing electric vehicles, so as to buy more reliable electric vehicles.
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