Commercial vehicle CNG supply system and vehicle

Abstract

The utility model discloses a commercial vehicle CNG (compressed natural gas) supply system and a vehicle and belongs to the technical field of automobiles, the gas supply system comprises a gas cylinder group and an engine injection system, and a high-pressure reducing valve and a filter are sequentially arranged between the gas cylinder group and the engine injection system along the gas flow direction. The air outlet end of the filter is integrally provided with a low-pressure stop valve used for cutting off an air path, and the air outlet end of the filter is connected with the air inlet end of an engine injection system through the low-pressure stop valve. The gas supply system is connected or disconnected along with start and stop of the engine, the gas cut-off function of the whole vehicle in the stop non-stop state is achieved, the frequency of frequent opening and closing of the high-pressure reducing valve in the unnecessary operation state is remarkably reduced, the service life of the high-pressure reducing valve is effectively prolonged, and therefore the stability and reliability of the gas supply system of the whole vehicle are greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of automotive technology, and in particular relates to a CNG supply system and vehicle for commercial vehicles. Background Technology

[0002] A CNG supply system for commercial vehicles is a complex system specifically designed for commercial vehicles such as trucks and buses that use compressed natural gas as fuel. Its core function is to safely store high-pressure natural gas and precisely supply the appropriate amount of atmospheric-pressure natural gas according to the engine's needs. When the vehicle is in motion, the high-pressure natural gas stored in the cylinder bank passes through the parallel assembly and related valves and pipelines. First, it passes through a high-pressure filter to remove impurities, then the airflow is controlled by a high-pressure solenoid valve. After the gas volume and pressure parameters are monitored by a gas meter and pressure sensor, it enters a pressure reducing valve for depressurization. The depressurized natural gas is then heated by a heat exchanger before entering the engine to mix with air and burn, providing power to the vehicle.

[0003] However, most common CNG supply modes currently rely on high-pressure pressure reducing valves to control the on / off state of CNG gas. These valves have a limited lifespan, typically only around tens of thousands of cycles, and are prone to failure, which in turn affects the stability and reliability of the vehicle's gas supply. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model provides a CNG supply system and vehicle for commercial vehicles. The supply system is connected or disconnected according to the start and stop of the engine, realizing the gas cut-off function of the whole vehicle in the state of stopping the engine but not stopping. It significantly reduces the number of times the high-pressure pressure reducing valve is opened and closed in the unnecessary operating state, effectively extending its service life, thereby greatly improving the stability and reliability of the vehicle's gas supply system.

[0005] This utility model is implemented as follows: a CNG supply system for commercial vehicles includes a gas cylinder group and an engine injection system. A high-pressure reducing valve and a filter are sequentially arranged between the gas cylinder group and the engine injection system along the gas flow direction. A low-pressure shut-off valve for cutting off the gas path is integrated at the outlet end of the filter. The outlet end of the filter is connected to the inlet end of the engine injection system through the low-pressure shut-off valve.

[0006] Furthermore, it also includes a controller for controlling the operation of the low-pressure shut-off valve. The controller is connected to the engine electrical signal and shuts off according to the engine status. When the engine stops, the controller sends a command to close the shut-off valve, thus disconnecting the gas path.

[0007] This application also provides a vehicle in which a CNG supply system as described above is provided.

[0008] The advantages and technical effects of this utility model are as follows: By adopting the above technical solution, a low-pressure shut-off valve is added to the air supply system. The air supply system is connected or disconnected according to the start and stop of the engine, realizing the air cut-off function of the whole vehicle in the state of stopping the engine without stopping. This significantly reduces the number of times the high-pressure reducing valve is opened and closed in the unnecessary operating state, effectively extending its service life, thereby greatly improving the stability and reliability of the whole vehicle air supply system and ensuring the safe and efficient power supply of the vehicle under various operating conditions. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the gas supply system connection provided in an embodiment of the present invention.

[0010] Figure 2 This is a schematic diagram of the working principle of the low-pressure shut-off valve provided in this embodiment of the utility model.

[0011] Figure 3 This is a schematic diagram of the working principle of the high-pressure pressure reducing valve provided in this embodiment of the utility model.

[0012] In the diagram: 1. Gas cylinder assembly; 2. High-pressure pressure reducing valve; 3. Filter; 4. Low-pressure shut-off valve; 5. Engine injection system. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0014] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0015] like Figure 1 As shown, this application provides a CNG supply system for commercial vehicles, including a gas cylinder group and an engine injection system. A high-pressure reducing valve and a filter are sequentially arranged between the gas cylinder group and the engine injection system along the gas flow direction. A low-pressure shut-off valve for cutting off the gas path is integrated at the outlet end of the filter. The outlet end of the filter is connected to the inlet end of the engine injection system through the low-pressure shut-off valve.

[0016] Furthermore, it also includes a controller for controlling the operation of the low-pressure shut-off valve. The controller is connected to the engine electrical signal and shuts off according to the engine status. When the engine stops, the controller sends a command to close the shut-off valve, thus disconnecting the gas path.

[0017] Gas supply principle: High-pressure gas enters the high-pressure reducing valve through the gas cylinder group. After the pressure is reduced, it enters the filter and enters the engine injection system through the integrated low-pressure shut-off valve.

[0018] like Figure 2 As shown, the working principle of the low-pressure shut-off valve is as follows: When the vehicle is powered on, the low-pressure shut-off valve performs a self-test; when the engine starts, the low-pressure shut-off valve opens; when the engine stops, the low-pressure shut-off valve closes.

[0019] like Figure 3 As shown, the working principle of the high-pressure reducing valve is as follows: when the vehicle is powered on, the high-pressure reducing valve opens; when the vehicle is powered off, the high-pressure reducing valve closes.

[0020] This application also provides a vehicle in which a CNG supply system as described above is provided.

[0021] By adopting the above technical solution, a low-pressure shut-off valve is added to the air supply system. The air supply system is connected or disconnected according to the start and stop of the engine, realizing the air cut-off function of the whole vehicle in the state of stopping the engine without stopping. This significantly reduces the number of times the high-pressure pressure reducing valve is opened and closed in the unnecessary operating state, effectively extending its service life, thereby greatly improving the stability and reliability of the vehicle's air supply system and ensuring the safe and efficient power supply of the vehicle under various operating conditions.

[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A CNG supply system for commercial vehicles, comprising a gas cylinder assembly and an engine injection system, characterized in that, A high-pressure reducing valve and a filter are sequentially arranged between the gas cylinder group and the engine injection system along the gas flow direction. The outlet end of the filter is integrated with a low-pressure shut-off valve for cutting off the gas path. The outlet end of the filter is connected to the inlet end of the engine injection system through the low-pressure shut-off valve.

2. The CNG supply system for commercial vehicles according to claim 1, characterized in that, It also includes a controller for controlling the operation of the low-pressure shut-off valve. The controller is connected to the engine electrical signal and shuts off the valve according to the engine status. When the engine stops, the controller sends a command to close the shut-off valve and disconnect the gas path.

3. A vehicle, characterized in that, The vehicle is equipped with a CNG supply system as described in any one of claims 1 to 2.

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