KR101620051B1 - Control device for natural gas supply of dual fuel generator engine - Google Patents

Abstract

The present invention relates to a method and apparatus for controlling the amount of natural gas supplied from a different-fuel-use engine, in which natural gas supplied to a combustion chamber through an intake valve is combusted during compression ignition of diesel fuel injected into a combustion chamber, To a natural gas supply control apparatus for a fuel generator engine.

Description

TECHNICAL FIELD [0001] The present invention relates to a natural gas supply control apparatus for a three-

The present invention relates to a natural gas supply control apparatus for a generator engine, and more particularly, to a natural gas supply control apparatus for a generator engine, which uses a diesel engine as a fuel supply source for supplying a natural gas to a combustion chamber through an intake valve, The present invention relates to a natural gas supply control apparatus for a heterogeneous fuel generator engine that can optimally control the amount of natural gas supplied from an engine.

In general, natural gas as an engine fuel is advantageous in that it is less expensive than gasoline or diesel (diesel) and has less harmful components in the exhaust gas.

Refining the existing natural gas reserves and natural gas extraction in the shale has increased production worldwide and the number of derivative projects has been increasing. Reflecting this, the engine that used a single fuel such as light oil and gasoline was modified to make it cheaper and polluted There have been many attempts to use natural gas as fuel. For example, it is possible to improve the fuel supply system of an engine using diesel fuel so that LNG or CNG fuel can be used together.

In order to use the different kind of fuel in the engine as described above, a fuel supply system capable of controlling the mixing ratio of the supplied fuel is required. For example, Korean Patent Publication No. 10-2007-0048684 (2007.05.09) A control system and a control method of a diesel engine are proposed, in which gas fuel is supplied to perform combustion so as to replace diesel fuel.

A hybrid engine using a heterogeneous fuel, which is a mixture of light oil and natural gas, has a mechanism that maximizes the output by causing combustion by supplying a minimum amount of light oil and then by burning natural gas.

In such a mechanism, when the engine is supplied with only light oil and then switched to the heterogeneous fuel mode, the time difference between the supply of the natural gas from the injector and the engine combustion chamber and the imbalance of the mixture ratio of the light oil and the natural gas supplied to the engine There is a problem that the momentary torque is reduced and the combustion performance is lowered.

Korean Patent Publication No. 10-2007-0048684 (2007.05.09)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power generation engine using different types of fuel, which is capable of maintaining an optimized ratio of natural gas through an intake valve, The output of which can be expressed by a natural gas supply control device.

In order to achieve the above object, according to the present invention, there is provided a gas supply control system for a heterogeneous fuel engine for driving a generator, comprising: a regulator unit for reducing a pressure of gas discharged from a tank to a predetermined pressure; A gas injector part for supplying a gas having a reduced pressure through the regulator part to the intake valve side of the engine combustion chamber; A heat exchanger formed at the inlet or outlet of the regulator to heat the gas; An information collecting unit for collecting operation information of the engine including the pressure and temperature of the gas applied to the gas injector, the gas supply amount, the intake air temperature, the exhaust temperature, the engine speed, and the engine temperature; A load calculation unit for calculating a load of the engine through a power load applied to the generator; A first storage section that is programmed and stored such that a change value of a gas supply amount corresponding to a collision mode switching or release step is differentiated according to a load value of the engine; A judging unit for judging whether a signal inputted from the driver or the operation information of the information collecting unit and the calculated value of the load calculating unit is compared with the set reference to switch to the coarse mode; A control unit for controlling an opening timing and a time of the gas injector according to a change value stored in the first storage unit when the determination unit determines that the cooing mode is switched or released; And a control unit.

A vibration measuring unit for sensing a vibration characteristic of the engine and comparing the vibration characteristic with a set value; A second storage unit for storing the operation information collected by the information collecting unit, the measured value of the load calculating unit, and the change of the output value of the vibration measuring unit according to time elapsed time; A communication unit connected to the external terminal and transmitting data stored in the second storage unit to the external terminal; And the control unit may be configured to release the cooing mode by controlling the opening timing and time of the gas injector unit according to the program of the first storage unit when the vibration measured by the vibration measuring unit is equal to or greater than a set value.

It is preferable that the program stored in the first storage unit is programmed to set a delay time for maintaining the supply amount of the gas in a predetermined increment or decrement from the change value of the gas supply amount of the gas injector unit over time.

The present invention can stably and precisely control the supply of the natural gas when the mode is switched so that the different kind of fuel is used in the generator engine, so that the output of the engine and the power generation can be made uniform by minimizing the torque drop and the unstable state of the combustion state .

1 is a block diagram illustrating a configuration and a connection relationship according to a preferred embodiment of the present invention;
2 is a block diagram illustrating a configuration and a connection relationship according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a configuration of a natural gas supply control apparatus for a fuel cell engine according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram illustrating a configuration and a connection relationship according to a preferred embodiment of the present invention. FIG. 1 is a block diagram of a hybrid fuel engine E for driving a generator G, A control unit 100 and a control unit 100. The control unit 100 includes a control unit 130, a heat exchanging unit 120, an information collecting unit 140, a load calculating unit 150, a first storing unit 160, a determining unit 170, .

The heterogeneous fuel engine of the present invention is basically a diesel engine using diesel (diesel), and operates in the coma mode, so that natural gas is supplied through the intake valves of the cylinders, .

Particularly, in the present invention, the heterogeneous fuel engine E is connected to the generator G to drive the generator G, and therefore, unlike an engine used in a vehicle, So that it is controlled to maintain the speed.

The regulator unit 110 is configured to reduce the pressure of the gas discharged from the tank T accommodating the liquefied natural gas (LNG) or the compressed natural gas (CNG) to be used as fuel. It is usually stored in the tank T at a very high pressure of 15 bar for liquefied natural gas and 200 bar for compressed natural gas as the fuel for the heterogeneous fuel engine E and can not be supplied directly to the engine. Accordingly, both the liquefied natural gas and the compressed natural gas are reduced to 6 to 7 bar through the regulator unit 110, and then supplied to the heterogeneous fuel engine.

The gas injector unit 130 is configured to supply the decompressed gas through the regulator unit 110 to the intake valve side of the engine combustion chamber. The gas injector unit 130 is opened and closed in an electronic manner to supply the reduced- . In this case, natural gas can be injected directly into the combustion chamber of the engine E, but in order to form a stable mixture of air and natural gas, By injecting the gas, the natural gas mixed with the air is supplied to the combustion chamber through the intake valve, and the output (the number of revolutions) of the engine is adjusted by adjusting the amount of natural gas supplied to the combustion chamber.

The heat exchanging unit 120 is formed at an inlet or an outlet of the regulator unit 110 to heat gas. The heat exchanging unit 120 heats the engine using the cooling water of the engine as a heat source. . The fuel system of the liquefied natural gas and the compressed natural gas differs depending on the physical properties of the liquefied natural gas and the compressed natural gas. Generally, in the case of the liquefied natural gas in a liquid state, the heat exchange portion is located on the inlet side of the regulator portion 110, And is installed at the outlet side of the regulator part 110 in the case of high-pressure compressed natural gas.

The information collecting unit 140 interlocks with various sensors installed in the heterogeneous fuel engine and the gas injector unit 130 to measure the pressure and temperature of the gas applied to the gas injector unit 130, The exhaust temperature, the number of revolutions of the engine, and the engine temperature.

Basically, the temperature, the intake air temperature, the exhaust temperature, and the engine temperature of the gas applied to the gas injector unit 130 are measured through the temperature sensor, and the pressure of the gas applied to the gas injector unit 130 through the pressure sensor is measured .

In the case of the engine speed (RPM), it is obtained through a signal calculation of a sensor that measures the number of revolutions of the camshaft and the crankshaft of the engine. Further, in the case of the natural gas supply amount supplied into the combustion chamber, it is possible to calculate substantially through the opening time of the gas injector 130 and the temperature and pressure information of the gas.

The load calculation unit 150 calculates the load of the engine through the power load applied to the generator G driven through the heterogeneous fuel engine. In the case of the vehicle engine, since the load fluctuation is frequent, The load of the engine is calculated through the sensor signal of the pedal. However, in the case of the engine for the generator of the present invention, since the number of revolutions is constant, the load of the engine is calculated through the power load supplied from the generator G.

In the present invention, only the light oil is supplied to the combustion chamber of the engine from the starting time of the first engine, and then natural gas is supplied through the gas injector 130 at the time when the number of revolutions of the engine is stabilized, ), And fuel control is performed in such a manner that the supply amount of the natural gas is gradually increased and the supply amount of the light oil is decreased. In this case, when the load fluctuation of the engine is heavy, it can not be smoothly mixed. Since it shows stable characteristics at high load under diesel operation rather than natural gas, even if the load of the engine is stable, .

Therefore, the load of the engine is calculated in real time through the load calculating unit 150, and the mixture ratio of the light oil and the natural gas is calculated on the basis of the calculated load.

The first storage unit 160 is configured such that the change value of the supply amount of natural gas in stepwise manner according to the switching of the engine to the disconnection mode or the disconnection mode is programmed and stored according to the load value of the engine, The supply amount of the natural gas supplied to the combustion chamber through the gas injector 130 is sequentially increased.

At the same time, when the rotational speed of the engine fluctuates due to the load variation due to the supply of the natural gas, the gasoline injection amount is automatically controlled through the governor provided in the engine, and the supply amount of the light oil supplied to the combustion chamber is sequentially decreased. The change value of the diesel supply amount with respect to the supply amount of the natural gas is preliminarily programmed based on the experimental data according to the load condition of the engine and is stored in the first storage unit 160. [

The amount of natural gas supplied through the gas injector 130 is sequentially reduced in the case where the collusion mode is canceled, so that the amount of natural gas injected through the gas injector 130 is automatically reduced through a governor provided in the engine, And the supply amount of the light oil supplied to the combustion chamber is sequentially increased.

The determination unit 170 may determine whether the signal input from the driver or the information collected by the information collecting unit 140 is a manual mode or a manual mode, And the calculated value of the load calculating unit 150 are compared with the set reference to judge the switching to the failure mode.

The switching of the coma mode under severe load fluctuation conditions may lead to a reduction in instantaneous torque and a decrease in the combustion performance, which is very difficult to apply. Therefore, in the present invention, The judgment of the condition is made, and if necessary, the driver may directly switch and cancel the coma mode. These criteria can be varied according to the type of engine, the standard, and the power usage environment, and standards are created based on test data for each situation.

The control unit 100 substantially controls the engine and includes the gas injector unit 130, the information collecting unit 140, the load calculating unit 150, the first storage unit 160, the determination unit 170, And the regulator unit 110 and the heat exchanging unit 120 can be controlled through electronic means. In particular, the determination unit 170 reads the program stored in the first storage unit 160 to control the opening time and the time of the gas injector unit 130 as the judgment of switching or disabling the collision mode is made.

In accordance with the present invention, the supply of natural gas to the combustion chamber is increased, the amount of the diesel oil is sequentially decreased, and then the normal diesel The mode is maintained.

In this case, unlike the light oil which is supplied to the combustion chamber and burned, the natural gas is supplied through the intake valve. Therefore, before the combustion mode is stabilized due to the time difference from the point of time when the natural gas is supplied to the point of time when the natural gas is combusted The engine output may be deteriorated instantaneously.

The program stored in the first storage unit 160 is stored in the first storage unit 160 so that the natural gas supply amount of the gas injector unit 130 changes over time, It is preferable to program such that a delay time for maintaining the supply amount of the constant increase / decrease value is set.

That is, the delay time in which the injection increase amount (or the decrease amount) is maintained for a predetermined time through the opening time control of the gas injector 130 is not continuous but the increase and increase of the natural gas supply amount and accordingly, So that a reduction and an increase are achieved in a stepwise manner. This delay time allows stable torque (output) control during mixed combustion compared to continuous diesel and natural gas injection rate control.

FIG. 2 is a block diagram illustrating a configuration and a connection relationship according to another embodiment of the present invention. In FIG. 2, a state due to combustion instability such as knocking is grasped to release a collision mode when an unexpected unstable combustion occurs. A function for extracting data and a structure for this are added.

To this end, a vibration measuring unit 180, which is a three-dimensional sensor for detecting the vibration characteristic of the engine and comparing the vibration characteristic with the set value, is installed outside the heterogeneous fuel using engine E. This is because the unstable combustion of the engine leads to unstable output of the engine and eventually it appears as an abnormal vibration of the engine. The vibration measuring unit 180 measures and monitors the vibration occurring during the operation of the engine.

In another embodiment of the present invention, a second storage unit 190 capable of storing data as shown in FIG. 2 and a communication unit 200 capable of performing data communication with the external terminal 300 are further configured.

The second storage unit 190 stores the operation information collected by the information collecting unit 140, the measurement value measured by the load calculating unit 150, and the change of the output value of the vibration measuring unit 180, And the communication unit 200 is connected to the external terminal 300 and transmits the data stored in the second storage unit 190 to the external terminal 300. In this case,

The external terminal 300 may be a portable computer such as a smart phone, a smart pad, or a laptop. The communication unit 200 may be a module capable of wired or wireless data communication and may acquire and analyze data stored in the second storage unit 190 through the communication unit 200, And reflects the program stored in the memory 160 so as to stably maintain the performance according to the coexistence.

At this time, when the vibration measured by the vibration measuring unit 180 is equal to or higher than the set value, the control unit 100 controls the opening timing and time of the gas injector unit 130 according to the program of the first storage unit 160, Mode, so that the collision mode is forcibly released in an unexpected collision instability situation, so that the engine can be stably operated.

It is to be understood that the invention is not limited to the disclosed embodiment, but is capable of many modifications and variations within the scope of the appended claims. It is self-evident.

100: control unit 110: regulator unit
120: heat exchanger 130: gas injector
140: Information collecting unit 150: Load calculating unit
160: First storage unit 170:
180: vibration measurement unit 190: second storage unit
200: communication unit 300:
E: heterogeneous fuel engine G: generator
T: tank

Claims (3)

A gas supply control system for a heterogeneous fuel engine (E) for driving a generator (G)
A regulator 110 for reducing the pressure of the gas discharged from the tank T to a pressure of 6 to 7 bar;
A gas injector part 130 which supplies gas decompressed through the regulator part 110 to the engine combustion chamber intake valve side and is opened / closed electronically;
A heat exchange unit 120 formed at an inlet or an outlet of the regulator unit 110 and heating the gas using the cooling water of the engine as a heat source while controlling a heating temperature condition by operating a cooling water valve;
The operation information of the engine including the pressure and temperature of the gas applied to the gas injector 130, the gas supply amount, the intake air temperature, the exhaust temperature, the engine speed, and the engine temperature, An information collecting unit 140 for calculating a natural gas supply amount to be supplied into the combustion chamber through the opening time and the temperature and pressure information of the gas;
A load calculation unit 150 for calculating a load of the engine through a power load applied to the generator G;
A first storage section (160) which is programmed and stored in such a manner that a change value of the gas supply amount corresponding to the cooing mode switching or release step is differentiated according to the load value of the engine;
A determination unit 170 for comparing a signal input from the driver or the operation information of the information collecting unit 140 and the calculated value of the load calculating unit 150 with a set reference to determine whether the mode is a failure mode;
The control unit 100 controls the opening timing and time of the gas injector 130 according to the change value stored in the first storage unit 160 when the determination unit 170 determines that the collision mode is switched or released. ;
A vibration measuring unit 180 which is composed of a three-dimensional sensor and detects a vibration characteristic of the engine E and compares the vibration characteristic with a set value;
A second storage unit for storing the operation information collected by the information collecting unit 140, the measured values of the load calculating unit 150 and the output values of the vibration measuring unit 180 in order of time lapse 190);
A communication unit 200 connected to the external terminal 300 to transmit data stored in the second storage unit 190 to the external terminal 300; Respectively,
When the vibration measured by the vibration measuring unit 180 is equal to or higher than the set value, the control unit 100 controls the opening timing and time of the gas injector unit 130 according to the program of the first storage unit 160, , ≪ / RTI >
The program stored in the first storage unit 160 is programmed to set a delay time for maintaining the supply amount of the gas at a predetermined increment or decrement from the change value of the gas supply amount of the gas injector unit 130 over time Fuel generator Generator control system for natural gas supply. delete delete

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