Why Does the Car Horn Sound by Itself for No Reason?
1 Answers
Car horn sounding by itself for no reason may be caused by the horn's power wire being continuously energized. Here are the relevant explanations: 1. There are two factors that can cause the horn's power wire to be continuously energized: The steering wheel button is stuck, remaining in the continuously energized position; the horn relay contacts cannot open normally, maintaining prolonged contact. 2. Composition of the horn: An automotive electric horn produces sound through the vibration of a metal diaphragm. It consists of an iron core, magnetic coil, contacts, armature, diaphragm, etc. 3. Operation of the horn: When the driver presses the horn switch, current flows through the contacts to the coil, generating magnetic force that pulls down the armature, forcing the diaphragm to move. The movement of the armature opens the contacts, interrupting the current and causing the coil's magnetic force to disappear. The diaphragm, with its own elasticity and the help of spring plates, returns to its original position along with the armature, closing the contacts again and allowing current to flow through the coil once more, generating magnetic force and repeating the above actions. This cycle repeats continuously, causing the diaphragm to vibrate and produce sound. The resonator, rigidly connected to the diaphragm, smooths the vibrations, making the sound more pleasant (this is the principle of an electromagnet).
