JP2000045809A - Apparatus and method for operating a common disaster prevention engine - Google Patents

Abstract

(57) [Summary] [Problem] To improve the exhaust gas level during normal use of gas-ignition gas engine for normal use and disaster prevention, and to improve the fuel consumption and exhaust gas level even in the emergency operation for light oil only, and to switch operation. Make sure. A light oil ignition engine (1) is provided with a common rail injector (10) as a liquid fuel supply device, and a liquid fuel supply control device (16) is connected to the common rail injector (10). 1
6) is provided with a recording means (17), which is operated mainly by gas during normal use and is operated exclusively for light oil during emergency, and records the operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly operates on a gaseous fuel (eg, natural gas) which is a primary fuel in normal use,
The present invention relates to a device and method for operating a common disaster-prevention / gas engine (particularly, a common disaster-prevention / light oil-ignited gas engine) that is operated only with a liquid fuel (eg, light oil) as a secondary fuel in an emergency.

[0002]

2. Description of the Related Art FIG. 3 and FIG. 4 show a conventional ordinary disaster-prevention / light oil ignited gas engine. In FIG. 3, the engine E1 is normally a spark ignition type gas engine, that is, a mixture of gas and air entered from an intake manifold 26 is ignited by a spark plug 28 in a combustion chamber 25 and is operated. ing. In an emergency such as when the supply of gas is cut off, the liquid fuel, usually light oil, stored in the fuel tank 36 is injected into the injection pipe 3 by the fuel injection pump 31.
The compression ignition operation is performed by injecting the fuel from the injection nozzle 33 through the nozzle 3. Reference numeral 23 denotes a cylinder block, and reference numeral 24 denotes a piston.

FIG. 4 shows a compression ignition gas engine E2 capable of switching between (liquid fuel + gas) / liquid fuel. In normal use, the fuel is ignited by a small amount of light oil from the small injection nozzle 63 in the sub chamber 45a, and the main combustion chamber 45 is ignited mainly by gas. The fuel is supplied to the small injection nozzle 63 from the fuel tank 54 by the small fuel injection pump 61 via the injection pipe 62.

[0004] The ratio of adding a small amount of light oil mainly with gas guarantees a level of exhaust gas that is no different from the case of using only gas as a gas-based fuel having a calorific value of 95% or more gas. In an emergency such as when the supply of gas is cut off, the fuel tank is exclusively used for light oil.
4, fuel is supplied from the fuel injection pump 51 via the injection pipe 51a, and the fuel injection pump 51 operates by compression ignition together with pure air entering from the intake manifold 46. Reference numeral 43 in FIG. 4 indicates a cylinder block, and reference numeral 44 indicates a piston.

[0005] As described above, even in a conventional conventional disaster prevention engine, it is possible to improve the exhaust gas level with gas (or gas) during normal use, and to continue without stopping the operation with liquid fuel stored in a fuel tank in an emergency. The purposeful function is fulfilled.

However, the structure of the combustion chamber when gas oil is injected into the combustion chamber to which the spark plug is mounted to perform compression ignition, the complexity of the arrangement of the spark plug and the arrangement of the electrical components, and the injection system are two systems. There were problems such as the difficulty in forming the structure around the combustion chamber due to the fact, and the difficulty in maintaining and maintaining the integrity.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems. In normal use, the operation is mainly performed with a gas fuel having a low exhaust gas level, and an emergency such as shutting off a gas supply line. It is an object of the present invention to provide an operating device and method of a common disaster prevention and gas engine which can sometimes be operated with a liquid fuel such as light oil and can reliably switch the operation.

[0008]

SUMMARY OF THE INVENTION An operating device for a common-use disaster-prevention gas engine according to the present invention mainly operates on a gaseous fuel which is a primary fuel in a normal use, and operates only with a liquid fuel which is a secondary fuel in an emergency. An operating device for a common-use disaster-prevention gas engine is provided with a common rail injector in a liquid fuel supply system.

According to the invention having the above configuration,
High-pressure injection is possible, and a common rail injector with good control accuracy allows accurate injection of a small amount of light fuel of liquid fuel into the mixture of gas and air to improve ignitability when operating mainly on gas. In both cases, the exhaust gas level can be kept low. Further, in the case of the operation using only the liquid fuel, the fuel efficiency is good and the exhaust gas level can be suppressed low as compared with other fuel injection pumps.

Here, it is preferable that a liquid fuel supply control device is provided in the liquid fuel supply system provided with the common rail type injector, and that the liquid fuel supply control device is provided with recording means for recording an operation state.

With this configuration, the above-described operation and effect of the common rail injector can be obtained. further,
The liquid fuel supply control device accurately injects a small amount of ignition for ignition, and in particular, when operating only with light oil, selects the optimal injection timing according to conditions such as intake air temperature, engine load conditions, etc., and injects fuel to reduce fuel consumption and exhaust gas. Can improve the level. In addition, the fuel supply control device is provided with a recording means to record the operation, and for example, confirms the record and manages the fuel consumption so that the light oil operation is not performed in normal use.

Further, in the operating device for a common disaster prevention engine according to the present invention, the liquid fuel supply control device restricts the liquid fuel supply amount to a certain value or less in normal use, releases the restriction of the liquid fuel supply amount in emergency, and It is preferable that the system is configured to record the fact that the vehicle has been operated in a state where the restriction has been released by the recording unit.

The operating method of the gas engine which is also used for emergency and disaster prevention according to the present invention operates mainly on the gaseous fuel which is the primary fuel at the time of normal use, and operates only with the liquid fuel which is the secondary fuel at the time of emergency. In a method for operating a common-use disaster-prevention / gas engine having a common-rail injector and a liquid fuel supply control device provided with a recording means for recording an operation state, a step of determining whether the service is normal or emergency, If it is time, the liquid fuel supply amount is limited to a certain value or less, and if it is an emergency, the restriction of the liquid fuel supply amount is released and the fact that the operation is performed with the restriction released is recorded by the recording means. And a process.

According to the method for operating the common disaster-prevention and gas engine of the present invention having such a configuration, the ignitability and the exhaust gas level in the case of gas-based operation are improved by the common rail type injector, and the operation of only the gas oil of the liquid fuel is performed. In this case, the fuel consumption is better than other fuel injection pumps, and the exhaust gas level is kept low. Further, the switching from the gas main operation to the light oil operation is performed by the liquid fuel supply control device by confirming specific conditions, so that the light oil operation is not performed in normal use. In addition, the liquid fuel supply control device injects a small amount of ignition injection with high accuracy, and in particular, when operating only with light oil, selects the optimal injection timing according to conditions such as intake air temperature, engine load conditions, etc. Exhaust gas level can be improved. Further, a recording means is provided in the liquid fuel supply control device, for example, to confirm the record so that the light oil operation is not performed in normal use, and to manage the fuel consumption.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, an intake manifold 6 for collecting pure air from an air cleaner (not shown) or a mixture of air and a gas from a gas supply device (not shown) of the light oil-ignited gas engine 1 is mounted on the cylinder head 2 and a combustion chamber 5 is provided. It is connected to the. Combustion chamber 5
Is formed by a cylinder head 2, a cylinder block 3, and a piston 4. The combustion chamber 5 is connected to an exhaust manifold 7 mounted on the cylinder head 2 for collecting and discharging exhaust gas. The combustion chamber 5 has a simple structure for improving combustion in a wide area spray by high-pressure injection, which is an advantage of a common rail injector described later.

The common rail type injector 10 as a liquid fuel supply device is mainly composed of a common rail 11 which is a booster pump and / or a pressure accumulator for high pressure fuel, and an injector 12 which injects high pressure fuel from the common rail 11. The common rail type injector 10 is capable of performing an accurate adjustment of an injection amount in consideration of an accurate injection timing by a high-pressure injection and an operation condition together with a fuel supply control device 16 described later.

A fuel tank 14 is connected to the common rail 11 via a fuel tube 15. The injector 12 is mounted on the cylinder head 2 for each cylinder. In addition, the common rail type injector 10
The fuel supply control device 16 is connected to the fuel supply control device 16, and a recording device 17 for recording an operation record such as a record of fuel use is connected to the fuel supply control device 16.

Next, an operation method involving fuel supply switching will be described with reference to the flowchart of FIG.
In the engine operation, the intake air from an air cleaner (not shown) is mixed with gas from a gas supply device (not shown) and sucked into the combustion chamber 5 via an intake manifold 6 and an intake valve 8 in a normal gas-based operation. . On the other hand, the light oil for ignition is supplied from the fuel tank 14 to the common rail type injector 10 by the fuel tube 15, and the high pressure light oil in the common rail 11 is injected as a spray into the combustion chamber 5 by the injector 12. In the gas-based operation in this case, the calorific value ratio, which is regarded as an allowable range in order to avoid a decrease in the exhaust gas level while promoting the ignition, that is, the calorific value of the gas oil / (the calorific value of the gas + the calorific value of the gas oil) ≦ 5/100 is 2 / Drive with 100 locked. In this way (gas + small amount of light oil)
Is generated, burned and discharged through the exhaust valve 9 and the exhaust manifold 7.

On the other hand, in an emergency when the gas cannot be used due to the stop of the gas supply or the like, the air from the air cleaner is sucked into the combustion chamber 5 as pure air. Then, a required amount of light oil is injected from the injector 12, and the diesel operation is performed by the light oil.

Next, the operation method including the above will be described with reference to the flowchart of FIG. In step S1, it is confirmed by another means whether the gas supply is cut off or other abnormalities, that is, whether the emergency sequence is ON and the main gas operation cannot be performed. If there is no abnormality and gas-based operation is possible, go to step 2. When the emergency sequence is ON, the operation proceeds to the emergency operation of step 4. In step S2, it is checked whether the emergency button has been pressed. An emergency signal indication or the like by an operator or the like, which is not included in the emergency sequence, is confirmed. If the emergency button is not ON and there is no problem, go to step S3. If the emergency button is ON, go to step S4. In step S3, a normal operation state is set. That is, the light oil injection for ignition is fixedly locked at 2% in terms of the calorific value in the gas-main operation. In this case, the injection amount from the injector 12 is within 5% of the maximum injection amount, and the injection with the low injection rate can be accurately performed by the common rail type injector 10. In step S4, an emergency operation, that is, a light oil operation is performed. The interlock, which is the constraint of steps S1 and S2, which is set to the light oil operation only in an emergency, is released. Substantially, the light oil injection amount fixed at 2% is released in step S3. In step S5, a record of the emergency operation, that is, the light oil operation, for example, the start and end of the operation, the light oil consumption, and the like are recorded. Next, the procedure goes to step S6. In step S6, it is determined whether the emergency state has been released, that is, whether the normal operation has become possible.
Then, it is confirmed whether or not the reset has been performed. If not reset, the process returns to step S4 to continue the emergency operation. If reset to the normal operation operable state, step S
At 7, the recording of the emergency operation is completed, and the process returns to step S3 to perform the gas-based operation of the normal operation.

As described above, in normal use, the operation is performed mainly with gas and the emission gas level is suppressed, and light oil operation in emergency is strictly checked. It contributes to the driving without any.

[0022]

The effects of the present invention are listed below. (1) Since a common rail type injector is provided as a fuel supply device for a light oil ignition gas engine, high-pressure injection provides good control of minute injection, accurate ignition injection quantity to improve ignitability and exhaust gas level, and The fuel efficiency and emission levels are also improved in light oil operation. (2) Since a liquid fuel supply control device is connected as the liquid fuel supply device in addition to the common rail injector, it is possible to prevent accidental light oil operation during normal use. In addition, since a recording device is attached to the fuel supply control device to record the emergency operation, it is possible to check for malfunction and manage fuel consumption.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an operating device and method for a common disaster-prevention / light oil-ignition gas engine according to the present invention.

FIG. 2 is a flowchart for explaining the operation of FIG. 1;

FIG. 3 is a block diagram showing a conventional light oil ignition gas engine.

FIG. 4 is a block diagram showing another conventional light oil ignition gas engine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Gas engine 2 ... Cylinder head 3 ... Cylinder block 4 ... Piston 5 ... Combustion chamber 6 ... Intake manifold 7 ... Exhaust manifold 8 ... Intake valve 9 ...・ Exhaust valve 10 ・ ・ Liquid fuel supply device, common rail type injector 11 ・ ・ Common rail 12 ・ ・ Injector 14 ・ ・ Fuel tank 15 ・ ・ Fuel tube 16 ・ ・ Liquid fuel supply control device 17 ・ ・ Recording device

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 3E038 AA03 BA09 CA02 GA01 HA04 3G066 AA01 AA07 AB02 AB05 AC09 AD13 BA17 BA28 3G084 AA01 AA05 BA13 DA26 DA27 3G092 AA01 AA02 AA07 AB03 AB06 AB12 AC00 EA09 EA13 EA15 FA15 FA15

Claims (4)

[Claims] 1. An operating device for a common disaster-prevention / gas engine that mainly operates on a gaseous fuel as a primary fuel during normal use, and operates only with a liquid fuel as a secondary fuel during an emergency. An operating device for a common-use disaster-prevention gas engine, comprising an injector. 2. A liquid fuel supply control device is provided in a liquid fuel supply system provided with the common rail type injector, and the liquid fuel supply control device is provided with a recording means for recording an operation state. Item 2. An operating device for a common-use disaster-prevention gas engine according to item 1. 3. The liquid fuel supply control device limits the liquid fuel supply amount to a fixed value or less during normal use, releases the restriction on the liquid fuel supply amount in an emergency, and informs that the operation has been performed with the restriction removed. 3. The operating device for a gas engine also used for normal and disaster prevention according to claim 2, wherein said operating means is configured to record by said recording means. 4. In normal operation, the fuel cell is operated mainly with gas fuel as primary fuel, and in emergency, it is operated only with liquid fuel as secondary fuel, and a common rail type injector and an operation state are recorded in a liquid fuel supply system. In a method for operating a common-use disaster-prevention / gas engine having a liquid-fuel supply control device provided with a recording means, a step of judging between a normal use and an emergency; And a step of releasing the restriction on the liquid fuel supply amount in an emergency and recording the fact that the operation has been performed with the restriction released by the recording unit. How to operate a common-use disaster-prevention light oil-ignited gas engine.