Vehicle for hydrogen system working principle of the solenoid valve

Onboard for hydrogen system the working principle of the solenoid valve in the electronic engineering gao times in order to guarantee the safe and stable operation of the fuel cell car, need to design a safe and effective for hydrogen system. On the fuel cell car for hydrogen system generally includes electromagnetic valve, safety valve, relief valve, hot melt bolt, manual stop valve, temperature sensor and pressure sensor, auxiliary safety device. Onboard for hydrogen system security measures from the two sides of prevention and control. From the point of view of prevention, based on domestic research and development of fuel cell minibuses, for example, car for hydrogen safety instance is given. Hydrogen fuel cell minibuses are accompanied by a high pressure tank, the temperature sensor installed on the hydrogen tank used to detect temperature, the gas inside the tank by the sensor, the temperature of air tank gas signal is sent to the wheelhouse dashboard, through the change of the temperature of the gas to the outside world if there were any unusual. The gas temperature suddenly rise sharply, for example, such as excluded from the temperature sensor fault, there may be fire happening around the hydrogen tank. Pressure sensor is mainly used to determine residual amount of hydrogen in the tank, to ensure the normal driving of vehicles, when the pressure is lower than a certain value can prompt the pilot charging hydrogen. Second, the driver according to the dashboard's pressure readings to determine whether a hydrogen gas leak. Tank safety valve also provides security for hydrogen system, when the hydrogen pressure in the tank more than set value, can pass holder automatic pressure relief valve, such as sudden high body temperature, for some reason cause the gas inside the tank pressure rise, when pressure exceeds the relief valve setting, the relief valve pressure relief automatically, guarantee the safe working pressure range. Gas solenoid valve is usually associated with manual stop valve, when the electromagnetic valve can work normally, manual stop valve in a normally open state, when the solenoid valve driven by dc power supply, no power supply in a normally closed state, when the main switch the role of the cylinder, and hydrogen leakage alarm system, when the concentration of hydrogen leakage protect value can be automatically shut down, so as to achieve the aim of cutting off hydrogen source. When gas solenoid valve failure using manual valve to cut off the source of hydrogen, effectively avoid hydrogen gas leak. Plus intake of refill with jet and air gun is linked together, to achieve the purpose of filling, and at the same time port should be one-way valve and particle filtering, and does not cover the electrical connectors, electrical switches and other ignition source to keep a distance of at least the mm. Check valve in the port or for hydrogen pipeline damage outward circumstances prevent gas leakage and improve the service life of the add port. Electromagnetic valve to tank filling, which can effectively prevent gas into the battery. Pressure reducing valve can be hydrogen pressure adjustment to the battery needed. When there is a danger clockwise valve can be hydrogen residual hydrogen safety vent in the jar. Due to the hydrogen for the hydrogen pressure flow in the pipeline, so the material selection of stainless steel tube, pressure than MPa. The overflow valve in the system to work normally, the valve closed. Only load in excess of the prescribed limit, The system pressure more than the setting pressure) When open the overflow valve, overload protection, no longer increases the system pressure ( Usually make the relief valve setting pressure higher than the system maximum working pressure % ~ %) Filtering valve can prevent the impurity in the pipe into the fuel cell, in order to avoid damage to the battery.