CN-224214269-U - Commercial car CNG gas supply system and vehicle

CN224214269UCN 224214269 UCN224214269 UCN 224214269UCN-224214269-U

Abstract

The utility model discloses a CNG air supply system of a commercial vehicle and a vehicle, and belongs to the technical field of automobiles, wherein the air supply system comprises an air cylinder group and an engine injection system, a high-pressure reducing valve and a filter are sequentially arranged between the air cylinder group and the engine injection system along the air flow direction, a low-pressure cut-off valve for cutting off an air path is integrally arranged at the air outlet end of the filter, and the air outlet end of the filter is connected with the air inlet end of the engine injection system through the low-pressure cut-off valve. The air supply system is connected or disconnected along with the start and stop of the engine, so that the air-break function of the whole vehicle in a non-stop state is realized, the frequent start and stop times of the high-pressure relief valve in an unnecessary operation state are obviously reduced, the service life of the high-pressure relief valve is effectively prolonged, and the stability and the reliability of the whole vehicle air supply system are greatly improved.

Inventors

SUN YEJUN
GUO CHENGJIE
Xue shuanglong
YU YUNLONG
WANG ZHENKUN
LI YUNPENG
JIANG XIAOHAN
CHEN RONG
ZHAO PIANPIAN

Assignees

北京福田戴姆勒汽车有限公司

Dates

Publication Date: 20260508
Application Date: 20250618

Claims (3)

1. The utility model provides a commercial car CNG gas supply system, includes gas cylinder group and engine injection system, its characterized in that, set gradually high-pressure relief pressure valve and filter along the gas flow direction between gas cylinder group and the engine injection system, the integrated low-pressure trip valve that is used for cutting off the gas circuit that is provided with of the end that gives vent to anger of filter, the end that gives vent to anger of filter is connected with engine injection system's inlet end through low-pressure trip valve.
2. The commercial vehicle CNG gas supply system according to claim 1, further comprising a controller for controlling the operation of the low pressure shut-off valve, the controller being electrically connected to the engine to shut off according to the engine state, the controller sending a command to close the shut-off valve when the engine is shut down, the shut-off valve opening the gas path.
3. A vehicle in which a CNG air supply system according to any one of claims 1 to 2 is provided.

Description

Commercial car CNG gas supply system and vehicle Technical Field The utility model belongs to the technical field of automobiles, and particularly relates to a CNG air supply system of a commercial vehicle and the vehicle. Background The CNG gas supply system of the commercial vehicle is a complex system specially designed for commercial vehicles such as trucks, buses and the like which use compressed natural gas as fuel. The core function of the system is to safely store high-pressure natural gas and accurately supply a proper amount of normal-pressure natural gas according to the requirements of an engine. When the vehicle runs, the high-pressure natural gas stored in the gas cylinder group passes through the parallel assembly and the related valves and pipelines, impurities are removed through the high-pressure filter, then the air flow is controlled through the high-pressure electromagnetic valve, parameters such as the air quantity and the pressure are monitored by the air quantity gauge pressure sensor, the air flow enters the pressure reducing valve for reducing the pressure, and the natural gas after the pressure reduction is heated by the heat exchanger and enters the engine for mixed combustion with air to provide power for the vehicle. However, the current common air supply mode is mostly dependent on a high-pressure relief valve to achieve on-off control of CNG (compressed natural gas), and the high-pressure relief valve has a limited service life, usually only about tens of thousands of times, and is easy to fail, so that the stability and reliability of air supply of the whole vehicle are affected. Disclosure of Invention Aiming at the problems in the prior art, the utility model provides a CNG air supply system of a commercial vehicle and the vehicle, wherein the air supply system is connected or disconnected along with the start and stop of an engine, so that the air-break function of the whole vehicle in a non-stop state is realized, the frequent start and stop times of a high-pressure relief valve in an unnecessary operation state are obviously reduced, the service life of the high-pressure relief valve is effectively prolonged, and the stability and the reliability of the air supply system of the whole vehicle are greatly improved. The CNG air supply system of the commercial vehicle comprises an air cylinder group and an engine injection system, wherein a high-pressure reducing valve and a filter are sequentially arranged between the air cylinder group and the engine injection system along the air flow direction, a low-pressure cut-off valve for cutting off an air path is integrally arranged at the air outlet end of the filter, and the air outlet end of the filter is connected with the air inlet end of the engine injection system through the low-pressure cut-off valve. Further, the engine control system also comprises a controller for controlling the low-pressure cut-off valve to work, wherein the controller is in electric signal connection with the engine and cuts off according to the state of the engine, and when the engine is stopped, the controller sends an instruction to close the cut-off valve, and the cut-off valve cuts off the gas path. Another aspect of the present application provides a vehicle in which any one of the CNG air supply systems described above is provided. The utility model has the advantages and technical effects that by adopting the technical scheme, the low-pressure cut-off valve is added in the air supply system, the air supply system is connected or disconnected along with the start-stop of the engine, the air-break function of the whole vehicle in a non-stop state is realized, the frequent start-stop times of the high-pressure relief valve in an unnecessary operation state are obviously reduced, and the service life of the high-pressure relief valve is effectively prolonged, so that the stability and the reliability of the whole vehicle air supply system are greatly improved, and the safety and the high efficiency of the power supply of the vehicle under various operation working conditions are ensured. Drawings Fig. 1 is a schematic diagram of connection of an air supply system according to an embodiment of the present utility model. Fig. 2 is a schematic diagram of the operation of the low pressure shut-off valve according to an embodiment of the present utility model. Fig. 3 is a schematic diagram of the operation of the high-pressure relief valve according to the embodiment of the present utility model. In the figure, 1, a gas cylinder group, 2, a high-pressure reducing valve, 3, a filter, 4, a low-pressure cut-off valve and 5, an engine injection system. Detailed Description The present utility model will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein ar