JPH01280640A - Throttle valve adhesion preventing method for gas engine mixer - Google Patents

Abstract

PURPOSE:To prevent adhesion of the end edge of a throttle valve to the internal wall of an inlet pipe by slightly opening the throttle valve from a totally closed position after a gas engine is stopped with the throttle valve driven the totally closed position. CONSTITUTION:A mixer 4 mixes a fuel gas supplied from a fuel tank 10 through a fuel supply pipe 12 with an air supplied from an air cleaner 22 at a venturi part 26 provided in an intake air passage 24. The flow rate of the air fuel mixture is then adjusted by a throttle valve 6, and supplied to a combustion chamber 28 of an gas engine 2. In this instance, the throttle valve 6 is controlled to be opened and closed by a control means 34 through a stepping motor 36. After the gas engine is stopped with the throttle valve 6 driven at a totally closed position, the throttle valve 6 is opened a little from the totally closed position. Adhesion of the end edge of the throttle valve 6 to the internal wall of the air inlet pipe 8 can thus be prevented.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for preventing the throttle valve of a gas engine mixer from sticking, and in particular, the present invention relates to a method for preventing the throttle valve of a gas engine mixer from sticking, particularly when the throttle valve of the gas engine mixer whose opening/closing operation is controlled by a control means is located inside the intake pipe. The present invention relates to a method for preventing a throttle valve of a gas engine mixer from sticking to a wall and improving starting problems.

[Conventional technology]

A gas engine supplied with fuel gas is configured as shown in FIG. 6, for example. In the figure, 2 is a gas engine, 4 is a mixer, 6 is a throttle valve, and 8 is an intake pipe. The gas engine 2 is supplied with a mixture of fuel gas and air generated by the mixer 4 . The mixer 4 supplies the liquid fuel gas stored in the fuel tank 1o to the fuel supply pipe 1.
2. The fuel supply pipe 12 includes a filter 14 for filtering and removing foreign matter in the fuel gas, a solenoid valve 16 for cutting off fuel, and a vaporizer 18 for vaporizing liquid fuel gas.
, a regulator 2 that reduces the pressure of the fuel gas to a predetermined pressure and adjusts the amount.
0 etc. are arranged.

The mixer 4 mixes the fuel gas supplied through the fuel supply pipe 12 and the air taken in from the air cleaner 22 in a venturi section 26 provided in the intake passage 24 in the intake pipe 8 to generate an air-fuel mixture.

The generated air-fuel mixture is supplied to the combustion chamber 28 of the gas engine 2 with the supply amount adjusted by the throttle hull processor,
Burn. Exhaust gas generated by combustion in the combustion chamber 28 passes through an exhaust passage 32 in an exhaust pipe 30 and is discharged to the outside.

The opening/closing operation of the throttle valve 6, which adjusts the supply amount of the mixture of fuel gas and air generated by the mixer 4 to the gas engine 2, is controlled by a control means 34, as shown in FIGS. 3 and 4. For example, if the actual engine speed N2 is smaller than the specified engine speed N1 from the system side (
Nl>N2), the stepping motor 36 is driven by the control means 34 to retire the iron 38 to the position shown by the broken line in FIG. 3, and the throttle valve 6 is opened. On the other hand, if the actual engine speed N2 is larger than the specified engine speed N1 (Nl<N2), the control means 34 drives the stepping motor 36 to push the iron 38 toward the solid line position in FIG. The throttle valve 6 is operated to close. In this way, the control means 34 controls the stepping motor 36 so that the actual rotation speed N2 matches the specified rotation speed N1.
to control the opening/closing operation of the throttle hull pro.

The gas engine 2 in which the opening/closing operation of the throttle hull processor is controlled by the control means 34 is described in Japanese Patent Application Laid-open No. 6
There is one disclosed in Japanese Patent No. 2-170750.

[Problem that the invention seeks to solve]

By the way, when starting the gas engine 2 where the control means 34 controls the opening/closing operation of the throttle hull pro, the control means 34 controls the fuel cutoff provided in the fuel supply pipe 12 when there is an engine start signal. Open the solenoid valve 16 for supplying fuel gas to the mixer 4,
The stepping motor 36 opens the throttle valve 6 from the fully closed position to the set opening position where it can be started, the starter 40 turns on the starter (not shown), and the ignition device 42 starts ignition, thereby starting the gas engine. Start 2. On the other hand, when stopping the driving of the gas engine 2, the ignition device 42 stops ignition in response to the engine stop signal B, and the stepping motor 36
The gas engine 2 Stops driving.

However, when stopping the drive of the gas engine 2, by closing the throttle hull pro to the fully closed position as described above, the end edge 6a of the throttle hull pro and the intake pipe 8 as shown in FIG. is in contact with the inner wall 8a over substantially the entire circumference. Therefore, especially when the gas engine 2 is stopped for a long period of time, there is a problem that the end edge 6a of the throttle valve 6 becomes stuck to the inner wall 8a of the intake pipe 8 due to moisture, dust, impurities, etc.

In this case, if the sticking force that fixes the throttle valve 6 is greater than the operating torque of the stepping motor 36 that opens and closes the throttle valve 6, the throttle valve 6 cannot be opened from the fully closed position. As a result, there was an inconvenience that the engine failed to start. Also,
If it becomes stuck, there is an inconvenience in that maintainability is reduced due to the need for costly maintenance and inspection.

[I-purpose of invention]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a throttle valve for a gas engine mixer that can prevent the throttle valve of the gas engine mixer, which controls the opening and closing operations of the throttle valve by a control means, from sticking to the inner wall of the intake pipe, thereby improving starting problems. The object of the present invention is to realize a method for preventing valve sticking.

[Means for solving problems]

In order to achieve this object, the present invention provides a throttle valve for a gas engine mixer whose opening/closing operation is controlled by a control means to adjust the supply amount of a mixture of fuel gas and air generated by the mixer. The present invention is characterized in that after the throttle valve is closed to the throttle valve (3) to stop the driving of the gas engine, the throttle valve is slightly opened from the fully closed position to a predetermined opening position.

[Effect]

According to the method of this invention, after the throttle valve of the gas engine mixer, which controls the opening and closing operation of the throttle valve, is closed to the fully closed position and the gas engine is stopped, the throttle valve is moved to the fully closed position. By slightly opening the throttle valve from the closed opening position to the predetermined opening position, a gap is formed between the edge of the throttle valve and the inner wall of the intake pipe, and the amount of contact can be reduced.

〔Example〕

Next, embodiments of the present invention will be described in detail based on the drawings.

The gas engine 2 is supplied with a mixture of fuel gas and air generated by a mixer 4, as shown in FIGS. 3 to 6. The mixer 4 is supplied with liquid fuel gas stored in a fuel tank 10 through a fuel supply pipe 12 . Fuel supply pipe 1
2 includes a filter 14 for filtering and removing foreign matter in the fuel gas;
, a solenoid valve 16 for fuel cutoff, a heparizer 18 for vaporizing liquid fuel gas, a regulator 20 for reducing the pressure of the fuel gas to a predetermined pressure and metering it, and the like are provided.

The mixer 4 mixes the fuel gas supplied through the fuel supply pipe 12 and the air taken in from the air cleaner 22 in a henchuri section 26 provided in the intake passage 24 in the intake pipe 8 to generate an air-fuel mixture.

The generated air-fuel mixture is supplied to the combustion chamber 28 of the gas engine 2 with the supply amount adjusted by the throttle hull processor,
Burn. Exhaust gas generated by combustion in the combustion chamber 28 passes through an exhaust passage 32 in the exhaust pipe 3o and is discharged to the outside.

The opening/closing operation of the throttle valve, which adjusts the supply amount of the mixture of fuel gas and air generated by the mixer 4 to the gas engine 2, is controlled by a control means 34, as shown in FIGS. 3 and 4. The control means 34 drives the stepping motor 12 and controls the throttle valve 6 in order to make the actual rotational speed N2 of the gas engine 2 match the specified rotational speed N,1.
Controls the opening/closing operation of the

As described above, regarding the throttle valve 6 of the mixer 4 of the gas engine 2 whose opening/closing operation is controlled by the control means 34 in order to adjust the supply amount of the mixture of fuel gas and air generated by the mixer 4, this throttle valve 6 to a fully closed opening position θ1 to stop driving the gas engine 2, and then slightly opening the throttle hull pro from the fully closed opening position θ1 to a predetermined opening position θ2. Particularly when the gas engine 2 is stopped for a long period of time, as shown in FIG. 5, this prevents the inconvenience of the end edge 6a of the throttle valve 6 sticking to the inner wall 8a of the intake pipe 8 due to moisture, dust, impurities, etc. .

Next, the operation will be explained according to FIGS. 1 and 2.

As shown in FIG. 2, when starting the gas engine 2,
The presence or absence of engine start signal A is determined. When there is an engine start signal A, the solenoid valve 16 for fuel cutoff provided in the fuel supply pipe 12 is opened to supply fuel gas to the mixer 4, and the stepping motor 36 is operated to the fully closed opening position θ.
The throttle valve 6 at 1 is opened to the set opening position θ3 that allows starting, the starter device 40 turns on a starter (not shown), the ignition device 42 starts ignition, and a timer is started.

Next, it is determined whether it is OK to start the gas engine 2,
When the starting of the gas engine 2 has been completed, a starter (not shown) is turned off and starting completion processing is performed. When determining whether or not it is OK to start the gas engine 2, if the start of the gas engine 2 is not completed, a predetermined time by a timer,
For example, after 10 seconds have elapsed, starting failure processing is performed.

When stopping the gas engine 2 which has been started and is being driven, the presence or absence of an engine stop signal B is determined as shown in FIG. When there is a signal B to the engine star 1, the ignition device 42 stops ignition, the stepping motor 36 closes the throttle hull pro to the fully closed opening position θ1, and the fuel cutoff device installed in the fuel supply pipe 12 By closing the electromagnetic valve 16 and stopping the supply of fuel gas to the mixer 4, the driving of the gas engine 2 is stopped.

After the engine speed of the gas engine 2 reaches Orpm and the drive is completely stopped, the throttle valve 6 is slightly opened from the fully closed opening position θ1 to a predetermined opening position θ2.

As a result, the edge 6a of the throttle valve 6 and the intake pipe 8
By forming a gap between the inner wall 8a of the throttle valve 6 and the inner wall 8a of the intake pipe 8, the amount of contact between the end edge 6a of the throttle valve 6 and the inner wall 8a of the intake pipe 8 can be reduced.

Therefore, even if the gas engine 2 is stopped for a long period of time, there is no risk that the throttle valve 6 will stick to the inner wall 8a of the intake pipe 8 due to moisture, dust, impurities, etc., and starting problems due to the throttle valve sticking will not occur. can be improved. Further, since the improvement can be carried out by improving only the software part of the control means 34, it is possible to avoid an increase in cost, and it is possible to avoid costly maintenance and inspection in the case of the same failure, thereby improving maintainability.

In this embodiment, the explanation has been given on preventing the throttle valve of a gas engine from sticking, but it is clear that this method can also be applied to preventing the throttle valve of a gasoline engine or a diesel engine from sticking.

〔Effect of the invention〕

As described above, according to the method of the present invention, after the throttle valve of the gas engine mixer, which controls the opening/closing operation of the throttle valve, is closed to the fully closed position and the driving of the gas engine is stopped, the throttle valve is closed. By slightly opening the valve from the fully closed position to the predetermined opening position, a gap is formed between the edge of the throttle valve and the inner wall of the intake pipe, and the amount of contact can be reduced.

Therefore, according to the method of the present invention, even if the gas engine is stopped for a long period of time, there is no risk that the throttle valve will become stuck to the inner wall of the intake pipe due to moisture, dust, impurities, etc. Thereby, it is possible to improve starting failures caused by sticking of the throttle valve. Furthermore, since it can be implemented by improving only the software part of the control means, it is possible to avoid an increase in cost, and it is possible to avoid costly maintenance and inspection in the event of sticking, thereby improving maintainability. The method of the present invention can be applied not only to preventing the throttle valves of gas engines from sticking, but also to preventing the throttle valves of gasoline engines and diesel engines from sticking.

[Brief explanation of the drawing]

Figure 1 shows flowcharts 1 and 2 when the gas engine is stopped.
Figure 3 is a side view of the gas engine mixer, Figure 4 is a sectional view of the gas engine mixer, Figure 5 is a sectional view of the main part of the throttle valve of the gas engine mixer, Figure 6 is a flowchart when starting a gas engine, The figure is a schematic configuration diagram of a gas engine. In the figure, 2 is a gas engine, 4 is a mixer, 6 is a throttle valve, 6a is an edge, 8 is an intake pipe, 8a is an inner wall,
10 is a fuel tank, 12 is a fuel supply pipe, 16 is a solenoid valve,
24 is an intake passage, 30 is an exhaust pipe, 32 is an exhaust passage, 34
36 is a stepping motor, 40 is a starter device, and 42 is an ignition device. Patent applicant: Suzuki Motor Co., Ltd. Agent: Yoshimi Nishigo, patent attorney

Claims (1)

[Claims] 1. In a throttle valve of a gas engine mixer whose opening/closing operation is controlled by a control means to adjust the supply amount of a mixture of fuel gas and air generated by the mixer,
After the throttle valve is closed to a fully closed position to stop driving the gas engine, the throttle valve is slightly opened from the fully closed position to a predetermined opening position. How to prevent engine mixer throttle valve from sticking.