Why is the reversing sound of hybrid vehicles particularly loud?
2 Answers
Hybrid vehicles have particularly loud reversing sounds due to engine-related reasons. Traditional Ignition: The working process of a mechanical ignition system involves the crankshaft driving the distributor shaft to rotate. The cam on the distributor shaft rotates, causing the primary contacts of the ignition coil to open and close, thereby generating high voltage. This high-voltage ignition current is then distributed by the rotor on the distributor shaft to the spark plugs of each cylinder in the required sequence, where the spark plugs generate sparks to ignite the gas in the combustion chamber. Electronic Ignition: Electronic ignition systems are entirely different from mechanical ignition systems. They include an electronic control device for ignition, which contains ignition control curves (MAP graphs) required for various engine operating conditions. A series of sensors, such as engine speed sensors, intake manifold vacuum sensors (engine load sensors), throttle position sensors, and crankshaft position sensors, are used to determine the engine's operating state.
The beeping sound of hybrid vehicles when reversing is actually specifically designed for pedestrian safety. I've researched new energy vehicle safety standards and found that regulations require electric vehicles to be equipped with a low-speed warning sound system because electric motors operate too quietly. When you shift into reverse gear, the vehicle automatically activates this warning sound, with the decibel level controlled around 65 dB - loud enough to alert pedestrians of a moving vehicle without being excessively harsh. This high-frequency beeping is easier for pedestrians to locate directionally compared to traditional engine sounds from fuel-powered vehicles, especially being more friendly for visually impaired individuals. Some premium models even support customizable warning tones.
