Nowadays, there are more and more electric vehicles on the road. Without warning sounds, it is easy to cause traffic accidents. Moreover, people's safety awareness is increasing. Therefore, for the safety of pedestrians on the road and the safety of vehicle personnel, the installation of low-speed warning sound systems for electric vehicles is very necessary. In order to provide a deeper understanding, this article will analyze the necessity of installing a low-speed warning sound system for electric vehicles.

Firstly, there is the requirement for vehicle speed. According to research, the main components of the noise emitted by vehicles vary at different speeds. The sound emitted when the vehicle speed is below 20 kilometers per hour is mainly the sound of the vehicle's power system, that is, the rapid engine part. At this time, the sound of the vehicle is relatively low. When the vehicle speed exceeds 20 kilometers per hour, the noise generated by the direct contact between the tires and the ground becomes much higher, which is the main component of vehicle noise. Moreover, the noise of electric vehicles at this time is basically close to the noise emitted by traditional vehicles at this speed.
The sound pressure level requirement is mainly affected by environmental background noise. The main purpose of installing an electric vehicle low-speed warning sound system is to enable other pedestrians to clearly identify the low-speed electric vehicle, so the sound pressure level of the sound it emits should be set according to the spectral distribution of the background noise. In our draft, we mainly specify the sound pressure levels on each one-third octave band within the main frequency range of 160 to 5000 Hz, which is convenient for humans to receive sound signals.
Regarding the frequency requirements, the main consideration is that the low-speed warning sound system of electric vehicles should be able to be well recognized by people of all ages. Due to the fact that elderly people may experience a certain degree of hearing loss from high-frequency sounds, the draft clearly specifies requirements for low-frequency aspects.
The frequency shift requirement is made to facilitate pedestrians and other road users to clearly identify the operating status of vehicle speed, and to meet the requirement of sound frequency shift. Its main principle is to simulate the Doppler effect.
As for the pause switch function, it is a switch set by the driver to actively turn off the low-speed warning sound system of electric vehicles when driving to certain areas with few people, or when it is quiet at night, in order to avoid interference from the surrounding environment caused by excessive noise from the low-speed warning sound system of electric vehicles.
In summary, the installation of a low-speed warning sound system for electric vehicles is very necessary. It can effectively ensure the safety of pedestrians, make them alert during the journey, and also prevent drivers from worrying. Therefore, everyone should respond and actively install a low-speed warning sound system.