Why Do New Energy Vehicles Require Age Interlocking?
Causes of high-voltage interlocking
From the perspective of system functional safety, every possible risk needs to be configured with corresponding security technology means to monitor it to reduce the probability of risk. From this level, high-voltage interlock is used as a safety measure for the safety of high-voltage systems in electric vehicles and is used in circuit design.
One of the risk points of the high-voltage system of electric vehicles is the sudden power failure and the car loses power. There are several reasons that can cause a car to lose power, one of which is the automatic release of the high-voltage circuit. The high-voltage interlock can detect such signs and provide alarm information to the vehicle controller before the high-voltage power failure, and reserve time for the vehicle system to take countermeasures. Another risk point of electric vehicles is human error operation. During the work of the system, the high-voltage connection point is manually disconnected. If there is no high-voltage interlocking design, at the moment of disconnection, the entire loop voltage is applied across the breakpoint, which is very dangerous for devices such as high-voltage connectors that do not have breaking capability. The voltage breakdown air draws an arc between the two devices. Although the time is short, it can be very high, which may cause damage to people and equipment around the breakpoint.
Purpose of high voltage interlock
Regarding the specific purpose of high-voltage interlocking, there are several different claims. Some people think that the high-voltage interlock mainly plays a role before the vehicle is powered on. If the circuit is detected to be incomplete, the system cannot be powered on to avoid accidents caused by problems such as virtual connections. Others believe that the high-voltage interlock is mainly caused by collision failure It plays a role in the process of electricity. The collision signal triggers the high-voltage interlock signal to power off the system. However, in a more critical situation after a collision, the fewer steps to perform a power outage, the better, and the collision signal is directly passed to the VCU, which is logically more reasonable.
