JP4115100B2 - Self-propelled unit for CNG vehicles and production method of CNG vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a CNG vehicle for use in the production of a compressed natural gas vehicle (hereinafter abbreviated as “CNG vehicle”) that uses compressed natural gas (hereinafter abbreviated as “CNG vehicle”) as fuel for the engine. More specifically, a CNG vehicle self-propelled unit and a CNG vehicle production method for supplying CNG as fuel to an engine of an incomplete CNG vehicle and allowing the CNG vehicle to self-propell. It is related to.
[0002]
[Prior art]
A CNG vehicle is a vehicle that uses natural gas as fuel instead of conventional fuel such as gasoline and light oil. This CNG vehicle is characterized by low pollution, such as relatively clean engine exhaust gas and low noise, due to the fuel characteristic of natural gas. Recently, due to this low pollution, CNG vehicles are attracting attention as next-generation vehicles.
[0003]
FIG. 7 shows a conventional production method for such a CNG vehicle. For example, as shown in FIG. 7 (a), assembling is performed as much as possible with respect to a common structural part with a normal diesel vehicle or the like on the assembly line. In this case, at least a wheel, a braking device, a steering device, an engine, and the like are mounted on the vehicle frame to be movable. In this state, an incomplete CNG vehicle cannot run on its own vehicle, so it is towed by a rope on another vehicle and moved to a stationary assembly area where the production of the special vehicle is stationary, and a high-pressure fuel container In addition, additional work will be performed on the dedicated structural parts of CNG vehicles such as high-pressure piping. Thereafter, an airtight test is performed by outsourcing the high-pressure fuel container and the high-pressure pipe line.
[0004]
When the above airtightness test is completed, the vehicle is pulled again by another vehicle and moved to, for example, a CNG stand outside the production factory, and CNG is filled into a fuel container of an incomplete CNG vehicle. After that, the CNG vehicle was driven by the supply of CNG from the fuel container of the CNG vehicle, moved to the completion inspection process, and the CNG vehicle was completed after passing the completion inspection.
[0005]
In the production method shown in FIG. 7B, all the structural parts of the CNG vehicle are assembled on the assembly line. Therefore, in this case, it is difficult to use an assembly line that is common to ordinary diesel vehicles. Also in this case, when the assembly of the CNG vehicle is finished, the vehicle is pulled by another vehicle and moved to the airtight test area, and the airtight test is performed on the high-pressure fuel container and the high-pressure pipe line. After that, as shown in FIG. 7A, the vehicle is pulled by another vehicle and moved to the CNG stand, the fuel container of the CNG vehicle is filled with CNG, and further moved to the completion inspection process. It was.
[0006]
Further, in the production method shown in FIG. 7 (c), all the structural parts of the CNG vehicle are assembled in a stationary assembly area where the production of the special vehicle is stationary, and further, the empty fuel container is mounted. And an airtight test is implemented about a high-pressure fuel container, a high-pressure piping line, etc. After that, as shown in FIG. 7A, the vehicle is pulled by another vehicle and moved to the CNG stand, the fuel container of the CNG vehicle is filled with CNG, and further moved to the completion inspection process. It was.
[0007]
[Problems to be solved by the invention]
In such a conventional CNG vehicle production method, since the CNG vehicle has many dedicated structures and takes time to assemble, production on the assembly line disturbs the flow of production of other mass-produced vehicles. It was difficult to produce mixed-flow production with other mass-produced cars on the line. In addition, since a CNG vehicle is used by filling a fuel container with a high-pressure gas of, for example, 20 MPa, an airtight test is required for the high-pressure fuel container and the high-pressure piping after assembly, and the airtight test takes 30 minutes or more. Therefore, it was not in time for the forced conveyor type production tact (about 7 minutes). Therefore, it was almost difficult to produce using a common assembly line with ordinary diesel vehicles.
[0008]
Furthermore, if the above airtight test is not completed even after the assembly is completed, the fuel container cannot be filled with CNG. Therefore, the CNG vehicle cannot run on its own vehicle and cannot run off-line from the assembly line. there were. Therefore, it has been necessary to tow the vehicle to another CNG stand and fill the fuel container of the CNG vehicle with CNG. In this case, two or more workers are required for towing, and the CNG vehicle before filling with CNG does not start the engine, the power steering does not operate, and only the side brake works. The reciprocating movement to the CNG stand was a dangerous work requiring human labor.
[0009]
Therefore, the present invention addresses such problems, enables an incomplete CNG vehicle before the airtight test and before filling with CNG to be able to self-run during assembly, and to self-run and go offline from the assembly line. An object of the present invention is to provide a self-propelled unit for a CNG vehicle and a method for producing a CNG vehicle capable of realizing efficient production on a vehicle assembly line.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a self-propelled unit for CNG vehicles according to the present invention includes a base frame for mounting on an incomplete CNG vehicle that has been implemented up to a predetermined production process in a vehicle assembly line, and the base A fuel container that is attached to the frame and accommodates CNG inside, a solenoid valve that is provided in the middle of a piping path from the fuel container to the intake system of the engine of the CNG vehicle, and that is downstream of the solenoid valve A pressure reducing valve for reducing the pressure of CNG from the fuel container, a means for preventing the pressure reducing valve from freezing, and a CNG supply for supplying CNG reduced by the pressure reducing valve to an intake system of an engine of a CNG vehicle A hose, and the assembly on the base frame is mounted on the unfinished CNG vehicle and used for self-propulsion.
[0011]
With such a configuration, a self-propelled unit for CNG vehicles that contains CNG inside the fuel container is mounted on an incomplete CNG vehicle using the base frame, and the fuel container serves as an intake system for the engine of the CNG vehicle. The pipe is opened and closed by an electromagnetic valve provided in the middle of the pipe, and the pressure of the CNG from the fuel container is reduced by a pressure reducing valve arranged on the downstream side of the electromagnetic valve, and the pressure is reduced by an antifreeze means. The freezing of the valve is prevented, and the CNG decompressed by the pressure reducing valve is supplied to the intake system of the engine of the CNG vehicle by the CNG supply hose. Thereby, CNG as fuel is supplied to the engine of the unfinished CNG vehicle so that the unfinished CNG vehicle can be self-propelled.
[0012]
Further, the antifreezing means of the pressure reducing valve comprises a liquid tank and a pump for supplying a liquid for preventing freezing around the pressure reducing valve. As a result, the pressure reducing valve is warmed to prevent freezing, and the function of the pressure reducing valve is ensured.
Furthermore, a filter for filtering CNG supplied to the intake system of the engine of the CNG vehicle is provided on the downstream side of the pressure reducing valve in the middle of the pipe line. Thereby, CNG supplied to the intake system of the engine of the CNG vehicle is filtered and purified.
[0013]
Furthermore, a second electromagnetic valve that opens and closes the CNG piping is provided on the front side of the CNG supply hose. This improves the safety of the CNG low-pressure piping supplied to the intake system of the engine of the CNG vehicle.
The CNG vehicle production method according to the present invention includes a step of carrying out a predetermined production process on a vehicle assembly line and mounting at least a wheel, a braking device, a steering device, and an engine on a vehicle frame so that the vehicle can move. A step of mounting the CNG vehicle self-propelled unit according to claim 1 on the movable CNG vehicle so that CNG can be supplied to the engine of the CNG vehicle, and supply of CNG from the CNG vehicle self-propelled unit The self-propelled CNG vehicle moves to the next production process, performs predetermined assembly, and performs a gas-tight test on the fuel container and piping of the CNG vehicle, and the CNG vehicle using the CNG vehicle self-propelled unit. A step of self-propelled, moving to a CNG stand, filling a fuel container of the CNG vehicle with CNG, and a step of lowering the CNG vehicle self-propelled unit from the CNG vehicle , Then, it is to perform the step of moving the supply of CNG from the fuel container CNG vehicles by driving the CNG vehicles to the completion inspection step.
[0014]
With such a configuration, the CNG vehicle self-propelled unit of the above means is mounted on a CNG vehicle that has been implemented up to a predetermined production process and is movable with at least wheels, a braking device, a steering device, and an engine mounted on the vehicle frame. The CNG vehicle can be supplied to the engine of the CNG vehicle, and the CNG vehicle is self-propelled by the CNG supply from the CNG vehicle self-propelled unit, moves to the next production process, performs predetermined assembly, and Perform airtight test of fuel container and piping, use CNG car self-propelled unit to make CNG car self-propelled, move to CNG stand, fill CNG car fuel container with CNG, and self-propelled for CNG car After the unit is removed from the CNG vehicle, the CNG vehicle is driven by the supply of CNG from the fuel container of the CNG vehicle and moves to the completion inspection process. This allows incomplete CNG vehicles before the airtight test and before filling with CNG to be able to self-run in the middle of assembly, allowing them to self-run and off-line from the assembly line. Try to realize production.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a front view showing an embodiment of a self-propelled unit for CNG vehicles according to the present invention, FIG. 2 is a left side view thereof, and FIG. 3 is a piping system showing an internal configuration of the self-propelled unit for CNG vehicles. FIG. This self-propelled unit 1 for CNG vehicles is used in the production of CNG vehicles that use CNG as the fuel for the engine, and can supply CNG as fuel to the engine of an incomplete CNG vehicle so that the CNG vehicle can be self-propelled To do.
[0016]
In FIG. 1, a base frame 2 serves as a mounting member for mounting the CNG vehicle self-propelled unit 1 on an incomplete CNG vehicle that has been implemented up to a predetermined production process in a vehicle assembly line. For example, it consists of two square bar-like members. In this case, an incomplete CNG vehicle that has been implemented up to a predetermined production process on the assembly line can only be moved with at least a wheel, a braking device, a steering device, and an engine mounted on the vehicle frame. It is.
[0017]
A fuel container 3 is attached to the base frame 2. The fuel container 3 contains CNG as fuel for a CNG vehicle, and is composed of, for example, a pressure-resistant container having a capacity of about 80 liters, and is filled with a high-pressure CNG of about 20 MPa at the maximum. The fuel container 3 is housed in a box-shaped housing 4. Further, as shown in FIG. 3, a CNG filling port 7 for filling the fuel container 3 with CNG is attached to the upstream side of the pipeline 6 extending from the gas outlet 5 of the fuel container 3, A CNG residual pressure gauge 8 for measuring the residual pressure of CNG in the fuel container 3 is attached.
[0018]
The piping 6 is disposed from the fuel container 3 to an intake system of an engine of a CNG vehicle (not shown), and an electromagnetic valve 9 is provided in the middle of the upstream of the piping 6. Yes. This solenoid valve 9 controls the sending of CNG to the intake system of the engine of the CNG car by opening and closing the gas flow path of the pipe line 6 in a state where each wiring coupler 17 described later is connected to the CNG car. The CNG vehicle is "opened" by turning on the power (turning on the key switch).
[0019]
A pressure reducing valve 10 is disposed on the downstream side of the electromagnetic valve 9 in the middle of the piping 6. The pressure reducing valve 10 is for reducing the pressure of CNG supplied from the fuel container 3. For example, the high pressure CNG of about 20 MPa is reduced to about 0.4 MPa and supplied to the engine of the CNG vehicle. . The electromagnetic valve 9 and the pressure reducing valve 10 are housed in a box-like box 4 ′ provided on the upper surface of the housing 4 in FIG. 1.
[0020]
In the vicinity of the pressure reducing valve 10, antifreezing means is provided. This anti-freezing means prevents the freezing because the decompression valve 10 is cooled (about −40 ° C.) by freezing when the high pressure CNG is suddenly decompressed by the decompression valve 10. It consists of a liquid tank 11 and a pump 12 for supplying a liquid for preventing freezing to the surroundings. The liquid tank 11 contains, for example, room-temperature water, and the pump 12 comprises, for example, an electric pump that supplies the water in the liquid tank 11 to a pipe wound around the pressure reducing valve 10. The liquid tank 11 and the pump 12 are housed inside the housing 4 in FIG.
[0021]
First and second filters 13 a and 13 b are provided on the downstream side of the pressure reducing valve 10 in the middle of the piping 6. The first and second filters 13a and 13b filter CNG supplied to an intake system of an engine of a CNG vehicle (not shown), and remove impurities mixed in the CNG. . Note that only one filter may be provided or not provided depending on the state of the CNG.
[0022]
A second electromagnetic valve 14 is provided on the downstream side of the first and second filters 13a and 13b in the middle of the piping 6. The second solenoid valve 14 opens and closes the CNG pipe 6 as with the solenoid valve 9 and controls the CNG to be sent to the intake system of the engine of the CNG vehicle on the outlet side of the pipe 6. It is like that. Note that the second electromagnetic valve 14 may not be provided depending on the state of the piping 6 or the like.
[0023]
A CNG supply hose 15 is provided on the downstream side of the second solenoid valve 14 at the end of the piping 6. The CNG supply hose 15 supplies CNG decompressed by the pressure reducing valve 10 to an intake system of an engine of a CNG vehicle (not shown), and is composed of a slightly flexible hose member, and at the tip thereof, the intake system of the engine A base 16 is provided for direct connection.
[0024]
In FIG. 1, reference numeral 17 denotes each wiring coupler for supplying power from the CNG vehicle side to the solenoid valves 9, 14, the pressure reducing valve 10, the pump 12, etc. of the CNG vehicle self-propelled unit 1, and reference numeral 18 denotes the above The eyebolt at the time of lifting with the lifting machine etc. in order to mount the self-propelled unit 1 for CNG vehicles in an incomplete CNG vehicle is shown.
Next, the use of the CNG vehicle self-propelled unit 1 configured as described above will be described. First, the CNG vehicle self-propelled unit 1 is lifted by a lifting machine or the like using the eyebolt 18 and, as shown in FIG. 4, at least a wheel 20, a braking device, a steering device, an engine, and the like are mounted on the vehicle frame 19. It is mounted on the vehicle frame 19 behind the cab 22 of the unfinished CNG vehicle 21 that can be moved, and is fastened and fixed using, for example, U bolts for bodywork. Next, the CNG supply hose 15 shown in FIG. 1 is connected to the intake system of the in-vehicle engine of the CNG vehicle 21, and the electrical wiring on the CNG vehicle 21 side and the electrical wiring on the CNG vehicle self-propelled unit 1 side are connected to each other. Connection is made with a wiring coupler 17.
[0025]
In this state, when the power of the CNG vehicle 21 is turned on (the key switch is turned on), the electromagnetic valve 9 of the CNG vehicle self-propelled unit 1 shown in FIG. 3 is opened, and the fuel container 3 is filled. High-pressure CNG is supplied to the pipeline 6, reduced in pressure by the pressure reducing valve 10, filtered by the filters 13 a and 13 b, and supplied from the CNG supply hose 15 to the in-vehicle engine of the CNG vehicle 21 through the second electromagnetic valve 14. Is done. At the same time, the pump 12 shown in FIG. 3 is operated to supply the water in the liquid tank 11 around the pressure reducing valve 10 to prevent the pressure reducing valve 10 from being frozen due to the sudden pressure reduction of CNG from the fuel container 3. .
[0026]
Thereafter, the key switch of the CNG vehicle 21 is turned on to start the in-vehicle engine. Thereby, the unfinished CNG vehicle 21 can be self-propelled by its own vehicle-mounted engine using CNG supplied from the fuel container 3 of the self-propelled unit 1 for CNG vehicles as fuel. Then, when the CNG vehicle 21 is moved to the CNG stand by using the CNG vehicle self-propelled unit 1 and the fuel container of the CNG vehicle 21 is filled with CNG, the CNG vehicle self-propelled unit 1 is replaced with the CNG vehicle. Remove from 21. Thereafter, the CNG vehicle self-propelled unit 1 is returned to the original assembly line and used repeatedly.
[0027]
Next, an outline of a CNG vehicle production method using the CNG vehicle self-propelled unit 1 will be described with reference to FIG. First, as shown in FIG. 5A, assembling is performed as much as possible with respect to a common structural part with a normal diesel vehicle or the like on an assembly line. In this case, at least a wheel, a braking device, a steering device, an engine, and the like are mounted on the vehicle frame to be movable. In this state, an incomplete CNG vehicle cannot run on the host vehicle.
[0028]
Therefore, as shown in FIG. 4, the CNG vehicle self-propelled unit 1 is mounted on the vehicle frame 19 of the incomplete CNG vehicle 21. Then, the CNG supply hose 15 shown in FIG. 1 is connected to the intake system of the in-vehicle engine of the CNG vehicle 21, and the electrical wiring on the CNG vehicle 21 side and the electrical wiring on the CNG vehicle self-propelled unit 1 side are connected to each wiring coupler. Connect at -17. As a result, CNG as fuel is supplied from the CNG vehicle self-propelled unit 1 to the vehicle-mounted engine of the CNG vehicle 21, so that the CNG vehicle 21 can be self-propelled by its own vehicle-mounted engine.
[0029]
In this state, the unfinished CNG vehicle 21 is self-propelled and moves to a stationary assembly area where the production of the special vehicle is stationary, and the dedicated structure portion of the CNG vehicle such as a high-pressure fuel container and a high-pressure pipe line Do additional work. Thereafter, an airtight test is performed on the high-pressure fuel container and the high-pressure pipe line.
When the airtight test is completed, the unfinished CNG vehicle 21 is self-propelled again, moves to, for example, a CNG stand outside the production factory, and fills the fuel container of the CNG vehicle 21 with CNG. Thereafter, the CNG vehicle 21 is driven by the supply of the CNG from the fuel container of the CNG vehicle 21 to move to the completion inspection process, and the CNG vehicle 21 is completed after passing the completion inspection.
[0030]
In the production method shown in FIG. 5B, all the structural parts of the CNG vehicle are assembled on the assembly line. In this state, an incomplete CNG vehicle cannot run on the host vehicle. Therefore, as shown in FIG. 4, the CNG vehicle self-propelled unit 1 is mounted on the vehicle frame 19 of the incomplete CNG vehicle 21, and the CNG supply hose 15 shown in FIG. In addition, the electrical wiring on the CNG vehicle 21 side and the electrical wiring on the CNG vehicle self-propelled unit 1 side are connected by each wiring coupler 17. As a result, CNG as fuel is supplied from the CNG vehicle self-propelled unit 1 to the vehicle-mounted engine of the CNG vehicle 21, so that the CNG vehicle 21 can be self-propelled by its own vehicle-mounted engine.
[0031]
In this state, the unfinished CNG vehicle 21 is self-propelled, moves to the airtight test area, and performs the airtight test on the high-pressure fuel container and the high-pressure pipe line. After that, as shown in FIG. 5A described above, the CNG vehicle 21 self-runs again and moves to the CNG stand, and fills the fuel container of the CNG vehicle 21 with CNG. Then, the CNG vehicle 21 is driven by the supply of CNG from the fuel container of the CNG vehicle 21 to move to the completion inspection process, and the CNG vehicle 21 is completed after passing the completion inspection.
[0032]
Next, a specific procedure of the CNG vehicle production method shown in FIG. 5A will be described with reference to the flowchart shown in FIG. First, a vehicle is assembled by carrying out a predetermined production process in a vehicle assembly line (tact assembly line) (step S1). In this case, as shown in FIG. 4, at least the vehicle 20 is equipped with wheels 20, a braking device, a steering device, an engine, and the like so as to be movable.
[0033]
Next, the CNG vehicle self-propelled unit 1 shown in FIGS. 1 and 2 is mounted on the incomplete CNG vehicle 21 that is made movable as shown in FIG. 4 (step S2). At this time, the CNG supply hose 15 shown in FIG. 1 is connected to the intake system of the in-vehicle engine of the CNG vehicle 21, and the electrical wiring on the CNG vehicle 21 side and the electrical wiring on the CNG vehicle self-propelled unit 1 side are connected to each other. Connect with coupler-17. As a result, CNG as fuel can be supplied from the CNG vehicle self-propelled unit 1 to the in-vehicle engine of the CNG vehicle 21. The CNG vehicle 21 can be driven by its own vehicle-mounted engine.
[0034]
Next, the CNG vehicle 21 is self-propelled by the supply of CNG from the CNG vehicle self-propelled unit 1, moves to the next production process, performs predetermined assembly, and the fuel container and piping of the CNG vehicle 21 An airtight test is performed (step S3). The next production process is performed, for example, in a special vehicle assembly area, and an attachment operation is performed on dedicated structures such as a high-pressure fuel container and a high-pressure pipe line that could not be attached on the assembly line in step S1. And an airtight test is implemented about the said fuel container, a piping path, etc. in an airtight test area.
[0035]
Next, the CNG vehicle 21 is self-propelled using the CNG vehicle self-propelled unit 1 and moved to the CNG stand, and the fuel container of the CNG vehicle 21 is filled with CNG (step S4). In this state, the CNG vehicle 21 can travel on the vehicle using its own fuel container. Thereafter, the CNG vehicle 21 is self-propelled using the CNG vehicle self-propelled unit 1 to return to the vehicle assembly line, and the CNG vehicle self-propelled unit 1 is lowered from the CNG vehicle 21 (step S5).
[0036]
At this time, the residual pressure of CNG in the fuel container 3 of the CNG vehicle self-propelled unit 1 is measured by the CNG residual pressure gauge 8 (see FIG. 3). If the residual pressure is small, the small pressure booster installed in the factory is used. Using the filling machine, CNG is filled into the fuel container 3 of the CNG vehicle self-propelled unit 1 (step S6). The lowered CNG vehicle self-propelled unit 1 is returned to and stored in the assembly line in step S1, and is used by being mounted on the next incomplete CNG vehicle 21 (step S2).
[0037]
Thereafter, the CNG vehicle 21 is driven by the supply of the CNG from the fuel container of the CNG vehicle 21 and moves to the completion inspection process (step S7). The CNG vehicle 21 is completed after passing the completion inspection. As described above, the CNG vehicle self-propelled unit 1 is mounted on the CNG vehicle 21 so that the incomplete CNG vehicle 21 before the airtight test and before filling with the CNG can be self-propelled during the assembly. It is possible to go offline from the assembly line, and to realize efficient production in the vehicle assembly line.
[0038]
【The invention's effect】
Since the present invention is configured as described above, the CNG vehicle self-propelled unit according to claim 1 supplies CNG as fuel to the engine of an unfinished CNG vehicle, thereby making the unfinished CNG vehicle self-contained. It can be runnable. Therefore, in the production of a CNG vehicle, an unfinished CNG vehicle before the airtight test and before filling with CNG can be self-propelled even during the assembly, and can be self-propelled and taken off-line from the assembly line. From this, it is possible to make time-consuming work off-line from the assembly line to meet the forced conveyor type production tact, and it is also possible to produce using a common assembly line with ordinary diesel vehicles, etc. It becomes. Therefore, CNG vehicles can be produced both in the tact assembly line and in the main mass production line, and a flexible production system can be realized, and efficient production in the production line of CNG vehicles can be realized.
[0039]
According to the second aspect of the present invention, the anti-freezing means for the pressure reducing valve comprises a liquid tank and a pump for supplying the anti-freezing liquid around the pressure reducing valve. It can be warmed to prevent freezing, and the function of the pressure reducing valve can be ensured.
According to the third aspect of the present invention, the CNG vehicle is provided with a filter for filtering CNG supplied to the intake system of the engine of the CNG vehicle on the downstream side of the pressure reducing valve in the middle of the pipeline. CNG supplied to the intake system of the engine can be filtered and purified.
[0040]
Furthermore, according to the fourth aspect of the present invention, the second solenoid valve that opens and closes the CNG pipe line is provided on the front side of the CNG supply hose to supply the intake system of the engine of the CNG vehicle. The safety of the CNG low-pressure piping can be improved.
Further, according to the method for producing a CNG vehicle according to claim 5, in the production of the CNG vehicle, the incomplete CNG vehicle before the airtight test and before the filling of the CNG can be self-propelled during the assembly, It is possible to go off-line from the assembly line, and to realize efficient production on the vehicle assembly line. Therefore, by taking the time-consuming work off-line from the assembly line, it is possible to make it in time for a forced conveyor type production tact, and it is also possible to produce using a common assembly line with a normal diesel vehicle or the like. . Therefore, CNG vehicles can be produced both in the tact assembly line and the main mass production line, and a flexible production system can be realized.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a self-propelled unit for a CNG vehicle according to the present invention.
FIG. 2 is a left side view of FIG.
FIG. 3 is a piping system diagram showing an internal configuration of the CNG vehicle self-propelled unit.
FIG. 4 is a plan view showing a state in which the CNG vehicle self-propelled unit is mounted on an incomplete CNG vehicle.
FIG. 5 is an explanatory diagram showing an outline of a method for producing a CNG vehicle according to the present invention.
FIG. 6 is a flowchart for explaining a specific procedure of the production method of the CNG vehicle.
FIG. 7 is an explanatory diagram showing an outline of a conventional method for producing a CNG vehicle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Self-propelled unit 2 for CNG vehicles ... Base frame 3 ... Fuel container 4 ... Housing 4 '... Box 6 ... Pipe lines 9, 14 ... Solenoid valve 10 ... Pressure reducing valve 11 ... Liquid tank 12 ... Pumps 13a, 13b ... Filter 15 ... CNG supply hose 16 ... Base 17 ... Each wiring coupler 19 ... Vehicle frame 20 ... Wheel 21 ... CNG vehicle

Claims (5)

A base frame for mounting on an incomplete CNG vehicle that has been implemented up to a predetermined production process in the vehicle assembly line;
A fuel container attached to the base frame and containing CNG inside;
An electromagnetic valve that is provided in the middle of a pipe line leading from the fuel container to the intake system of the engine of the CNG vehicle;
A pressure reducing valve disposed on the downstream side of the electromagnetic valve for reducing the pressure of CNG from the fuel container;
Means for preventing the pressure reducing valve from freezing;
A CNG supply hose for supplying CNG decompressed by the pressure reducing valve to an intake system of an engine of a CNG vehicle,
A self-propelled unit for a CNG vehicle, wherein the assembly on the base frame is mounted on the incomplete CNG vehicle and used for self-propelled operation. 2. The self-propelled unit for a CNG vehicle according to claim 1, wherein the freeze prevention means of the pressure reducing valve comprises a liquid tank and a pump for supplying a liquid for preventing freezing around the pressure reducing valve. 3. A self-contained vehicle for a CNG vehicle according to claim 1 or 2, wherein a filter for filtering CNG supplied to an intake system of an engine of the CNG vehicle is provided on the downstream side of the pressure reducing valve in the middle of the pipe line. Running unit. The self-propelled unit for a CNG vehicle according to any one of claims 1 to 3, wherein a second electromagnetic valve that opens and closes a CNG pipe line is provided on the front side of the CNG supply hose. Carrying out a predetermined production process in a vehicle assembly line and mounting at least a wheel, a braking device, a steering device, and an engine on a vehicle frame to be movable;
Mounting the CNG vehicle self-propelled unit according to claim 1 to the movable CNG vehicle so as to be able to supply CNG to the engine of the CNG vehicle;
A step of self-propelling the CNG vehicle by supplying CNG from the CNG vehicle self-propelling unit, moving to the next production process, performing predetermined assembly, and performing an airtight test of the fuel container and the piping of the CNG vehicle;
Using the above-mentioned self-propelled unit for CNG vehicles to make the CNG vehicle self-propelled, move to a CNG stand, and fill CNG vehicle fuel containers with CNG;
Lowering the CNG vehicle self-propelled unit from the CNG vehicle;
Thereafter, the CNG vehicle is driven by the supply of CNG from the fuel container of the CNG vehicle and moved to a completion inspection process;
A method for producing a CNG vehicle, characterized in that

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