Fire prevention device of motor vehicle

Abstract

The invention discloses a fire prevention device of a motor vehicle, which comprises a detection circuit, a comparison circuit, a time-delay circuit, a control circuit, a master control circuit and a reset switch, wherein the detection circuit is used for amplifying a current signal in a line and transmitting the current signal to the comparison circuit; the comparison circuit is used for transmitting the signal to the control circuit through the time-delay circuit through comparing with a set value; the detection circuit, the comparison circuit and the time-delay circuit are integrated by a quad operational amplifier; and the master control switch is a normally closed relay. The fire prevention device of the motor vehicle is completely compatible with the traditional vehicle electrical equipment and line system, and the quad operational amplifier is selected, thereby, the volume is reduced, the installation is convenient and the reliability of the circuits is also improved; electric sparks, which reach as high as ten thousands of volts, and are generated when the motor vehicle generates faults, can be borne by adopting the normally closed relay, thereby, the ablation caused by the actuating of relay is reduced, and further the system stability is improved.

Description

technical field [0001] The invention belongs to an overcurrent protection device, in particular to a motor vehicle fire protection device. Background technique [0002] At present, the spontaneous combustion of most motor vehicles is mainly caused by electrical and circuit failures. Because there is no superconductor at room temperature, heat will be generated when the current passes. The ignition point of the substance, thus causing the vehicle to spontaneously ignite. The fire department once analyzed the spontaneous combustion accidents of vehicles, and the majority of fires occurred under the driving state of motor vehicles, accounting for about 70%; the cause of the fires was mostly short circuit of vehicle lines, accounting for more than 60%. Spontaneous combustion of motor vehicles is caused by damage to oil circuits, circuits and modified parts of motor vehicles, and has no direct relationship with the age of the vehicle. The occurrence of motor vehicle electrical ...

AI Technical Summary

Problems solved by technology

The occurrence of motor vehicle electrical faults is mainly caused by the following three aspects: 1. The owner will equip the vehicle with an anti-theft device, replace it with high-end audio, improve the shape, add other electrical devices, etc., without analyzing the wiring layout and specific structure of the vehicle, nor Considering the calculation of the power of different lines and casually lead the wires, there is no insurance in places with heavy loads, and the places that are prone to friction are not effectively fixed, etc. Spontaneous combustion accidents are inevitable

2. High temperature weather, long-distance driving of motor vehicles, overloaded loading, transportation, etc., make the engine components and lines run continuously for a long time, resulting in temperature rise, coupled with poor ventilation conditions of the engine, collide with each other and generate sparks , will also cause a short circuit in the power line, causing spontaneous combustion and fire

3. For unmodified qualified vehicles, each branch circuit from the battery has a fuse (fuse), which will automatically fuse and cut off the current if the current exceeds the design

However, there is no automatic fuse in the starting system circuit of all vehicles. This is because the instantaneous stall current of the starting motor in this circuit is relatively large (the maximum instant stall current of a car is 550~600A, and the maximum instant stall current of a light moped or motorcycle is The current is 200~400A), the existing fuse cannot withstand such a large current impact, if the starter motor, starter system circuit, switch and other components are damaged, it will inevitably cause the vehicle to spontaneously ignite

Images