Collision safety detection device for fuel cell bus and control method of collision safety detection device

Abstract

The invention discloses a collision safety detection device for a fuel cell bus, and also discloses a control and use method of the collision safety detection device for the fuel cell bus. According to the invention, a pipeline interlocking detection scheme is adopted, and a simple, economical and high-precision hydrogen pipeline resistance stress detection device is used. Strain gauges are adhered to a hydrogen pipeline and a fuel cell box body to serve as test points, each strain signal is picked up and passes through a bridge balancing circuit and a signal amplifying circuit, and the deformation condition of each test point is judged, so that whether the hydrogen pipeline is damaged can be directly detected. In addition, whether the vehicle is collided or not is judged by integrating electric signals such as triaxial acceleration, an insulation resistance value, a hydrogen leakage value, the liquid level of cooling liquid of a fuel cell system and the like, the hydrogen leakage danger caused by damage of hydrogen management is found in advance, and secondary accidents such as explosion or personnel electric shock caused by hydrogen leakage after vehicle collision can be avoided.

Description

technical field [0001] The invention relates to the field of collision safety of a fuel cell bus, and more specifically relates to a fuel cell bus collision safety detection device and a control method thereof. Background technique [0002] The energy source of the fuel cell bus comes from the fuel cell system and the power battery system. The fuel cell system is a power generation device that generates electric energy through the chemical reaction of hydrogen and oxygen (from the air), and the power battery system is a high-voltage energy storage device. At present, the fuel cell system is expensive, accounting for about 50% of the vehicle cost, and its service life is only tens of thousands of hours. At the same time, hydrogen is a flammable and explosive dangerous gas, and its explosion limit when mixed with air The range is 4.0% to 75.6% (volume concentration). When a fuel cell vehicle collides, it may cause damage to the hydrogen pipeline or hydrogen flow channel, resul...

AI Technical Summary

Problems solved by technology

[0003] However, a fuel cell bus is different from a passenger car because it has a large number of passengers, a large vehicle size, a heavy vehicle weight, and complex working conditions in the suburbs. Obviously, only through the collision sensor to detect the acceleration or acceleration change, sometimes the sensor cannot determine the actual collision. However, at this time, the vehicle collision (especially the side collision of the vehicle) may have damaged the fuel cell system or the hydrogen pipeline and interface, etc., and some may Hydrogen leakage has already occurred, and the fuel cell system is still in normal working condition, which can easily lead to secondary accidents

It is also possible that due to the installation position or quantity of the collision sensor, when the front axle of the vehicle yaws, the collision sensor is installed in the fuel cell system accessory at the rear of the vehicle, and cannot detect the vehicle yaw angular acceleration, even the sensor set The collision threshold is too large, and the collision cannot trigger the alarm

[0004] At present, the collision sensors installed on fuel cell vehicles on the market will shut down the hydrogen gas by controlling the hydrogen supply system when a serious collision is detected, even if the vehicle collision does not endanger the fuel cell system, hydrogen supply system and other high-voltage components of the vehicle. The valve adopts the method of emergency shutdown of the fuel cell system, which can easily lead to fuel cell stack reaction gas starvation, dynamic potential cycle and high potential cause catalyst and its carrier materials to decay, shortening the service life of the fuel cell stack

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