I. Introduction

With the increasing attention to renewable energy in the world, new energy vehicles such as electric vehicles and hybrid vehicles have gradually become the mainstream of the market. The power source of these vehicles is mainly battery pack, and its high-voltage electrical system has a vital impact on the performance and safety of vehicles. Among them, High Voltage Interlocking (HVIL) is a key safety measure to prevent accidental contact with high voltage live parts. This paper will discuss the principle and fault analysis of new energy high-voltage interlock.

Second, the principle of new energy high-voltage interlocking

High voltage interlock (HVIL) is a protective measure to prevent accidental contact with high voltage live parts. In new energy vehicles, HVIL judges whether the system is in a safe state by monitoring the voltage and current of the high-voltage system. If the system fails, HVIL will immediately cut off the power supply to avoid possible accidents.

Three, new energy high voltage interlock fault analysis

High-voltage interlock failures are usually caused by the following reasons:

Hardware failure: including the failure of sensors, actuators, connecting wires and other hardware equipment. These failures may cause HVIL system to fail to work normally, and even lead to safety accidents.

Software failure: HVIL system may not work normally due to software error or virus attack. For example, if a virus attacks the control unit of HVIL system, it may lead to misjudgment or failure of the system.

Human factors: due to improper operation or maintenance, HVIL system may also fail. For example, in the process of maintenance, if the staff does not operate according to the regulations, it may lead to safety accidents.

Four. conclusion

New energy high-voltage interlock is an important measure to ensure the safety of new energy vehicles. However, due to various reasons, such as hardware failure, software failure and human factors, high-voltage interlocking system may fail. Therefore, it is necessary to strengthen the maintenance and overhaul of HVIL system and improve the skill level of operators to ensure the safe operation of new energy vehicles. In addition, we need to further strengthen the research and development of HVIL system and improve its reliability and safety to meet the needs of the development of new energy vehicles.

Verb (abbreviation of verb) Suggestions and Prospects

In view of the above problems, we put forward the following suggestions:

Check and maintain HVIL system regularly to ensure the normal operation of hardware equipment and software system.

Strengthen the training and assessment of operators, and improve their skill level and safety awareness.