LNG vehicle-mounted intelligent fuel gas control system and control method thereof

Abstract

The invention discloses an LNG (Liquefied Natural Gas) vehicle-mounted intelligent fuel gas control system and a control method thereof. The control system comprises an LNG cylinder, a vaporizer, a buffer tank, a fuel gas system controller, a sensor, an actuator and a control panel, the fuel gas system controller is connected with the sensor, the actuator and the control panel. The sensor is respectively connected with the LNG cylinder, the vaporizer and the buffer tank; the sensor transmits a monitored signal to the fuel gas system controller, and the fuel gas system controller controls the actuator to act according to a signal of the sensor or an instruction of the control panel; the control method comprises a liquid adding control method, an emptying control method, a liquid outlet control method, a pressurization control method, a current limiting control method, a safety control method and an actuator heating control method. The method is safe, environment-friendly, intelligent and easy to operate.

Description

technical field [0001] The invention relates to the technical field of vehicle-mounted LNG, in particular to a vehicle-mounted LNG intelligent gas control system and a control method thereof. Background technique [0002] At present, the homogeneity of LNG vehicles in the industry is serious. All valve bodies in the gas system are purely mechanical structures. Except for liquid level gauges and gas leakage sensors, there are basically no sensors and actuators. It is impossible to monitor and adjust the working status of the gas system in real time, that is, it is impossible Realize intelligent control; in addition, the operation of the current gas system is too complicated, and it is easy to cause human error to cause vehicle failure; in addition, some side-mounted gas cylinders are too close to the tires and there is insufficient space, so it is relatively difficult to operate the valve bodies. [0003] The deficiencies of the current gas system in the industry are mainly r...

AI Technical Summary

Problems solved by technology

[0004] 1. The current gas system cannot output natural gas with relatively accurate and stable temperature, flow and pressure in real time. Due to the characteristics of purely mechanical structure, precise and closed-loop control cannot be realized, which is not conducive to the stability of engine work, the economy of gas consumption and Control of exhaust emissions;

[0005] 2. In the event of a collision, the current gas system cannot completely cut off the gas output, and it is prone to spontaneous combustion accidents caused by gas leakage after the collision, which is not conducive to vehicle safety and environmental protection;

[0006] 3. The current gas system cannot accurately control the flow of coolant in the water-bath carburetor, and cannot sense the temperature of the coolant. It is prone to abnormal low temperature of the carburetor, which will cause the carburetor to freeze and expand, and eventually gas leakage accidents will occur, which is not conducive to driving safety and environmental protection;

[0007] 4. The current gas system cannot actively end the filling function, and it is prone to overcharging, which is not conducive to vehicle safety and environmental protection;

[0008] 5. The current gas system cannot realize the control of the cylinder pressure when adding liquid, which is not conducive to vehicle power, economy and exhaust emission control;

[0009] 6. The current gas system cannot realize the active intelligent supercharging function, and cannot realize the closed-loop control and real-time adjustment of the supercharging system, which is not conducive to vehicle power, economy and exhaust emission control;

[0010] 7. The current gas system cannot realize human-vehicle interaction, and the driver cannot view and control the gas system through the mobile APP;

[0013] 10. The operation of the current gas system valve body is too complicated, and it is prone to system failure and vehicle safety problems caused by human error;

[0014] 11. At present, some side-mounted gas cylinder models have a relatively compact gas cylinder layout, and the distance between the gas cylinder protection ring and the tire and fender is relatively close, which makes it extremely difficult to manually operate the valve body

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