JP2003279107A - Controller for engine drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller for an engine drive device capable of reducing costs by unifying devices to be shipped regardless of fuel types and appropriately determining whether a fuel setting change is acceptable or not. <P>SOLUTION: The engine drive device (air conditioner 10) driven by a gas engine 30 comprises fuel setting means 55 and 58 for setting a fuel to be supplied to the engine, a setting change determination means (CPU 56) for determining whether there is a change in setting by the fuel setting means, and a fuel acceptability determination means (CPU 56) for determining whether the setting change is acceptable when the engine is driven after the setting change determination means determines that there is the change in setting. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an engine driving device such as an air conditioner driven by an engine or a power generator.

[0002]

2. Description of the Related Art For example, in an air conditioner driven by an engine, a gas heat pump type air conditioner in which a compressor is driven by a gas engine is known, and a fuel is supplied from a gas engine fuel supply device to the gas engine. A mixture of gas and air is supplied. The engine fuel supply device includes a fuel adjustment valve, and the fuel adjustment valve changes the amount of fuel supplied to optimally adjust the air-fuel ratio of the air-fuel mixture.

[0003]

By the way, the above fuel regulating valve is used for the type of fuel gas (for example, propane, city gas 1).
3A), a plurality of models corresponding to 3A) are prepared by the time of shipment of the air conditioner, and as the air conditioner, a model corresponding to the type of fuel gas in the area where the air conditioner is installed is shipped.

As described above, since a plurality of types of fuel regulating valves are prepared for each type of fuel gas, the cost is increased.

The object of the present invention was made in consideration of the above circumstances, and it is possible to unify the shipping models regardless of the type of fuel to reduce the cost and to change the setting of the fuel. An object of the present invention is to provide a control device for an engine drive device, which is capable of accurately determining suitability.

[0006]

According to a first aspect of the present invention, in an engine drive device driven by an engine, fuel setting means for setting fuel supplied to the engine, and setting by the fuel setting means. A setting change determination means for determining whether or not there is a change, and a fuel suitability determination means for determining whether or not the setting change has been made by the setting change determination means, and determining whether or not the setting change is appropriate when the engine is driven. It is characterized by that.

According to a second aspect of the present invention, in an engine drive device driven by an engine, fuel setting means for setting fuel supplied to the engine, and whether or not there is a setting change by the fuel setting means is determined. And a fuel suitability determining means for determining whether the setting change is present and also for determining whether the setting change is appropriate when the engine is driven, and the fuel suitability determining means. When it is determined that the fuel setting change is appropriate, the determination as to whether or not the fuel is appropriate is omitted until the next fuel setting change is performed.

The invention described in claim 3 is the invention according to claim 1 or 2.
In the invention described in (3), when the fuel suitability determination means determines that the fuel setting change is inappropriate, an alarm is output and the engine is stopped.

The invention according to claim 4 is the invention according to claims 1 to 3.
In the invention described in any one of (1) to (4) above, the setting change of the fuel corresponds to the type of fuel.

The invention described in claims 1 to 3 has the following effects.

Fuel setting means for setting the fuel to be supplied to the engine, setting change determining means for determining whether or not there is a setting change by the fuel setting means, and this setting change determining means determines whether or not there is a setting change. In addition, since it is equipped with a fuel suitability judging means for judging suitability of setting change when the engine is driven, the fuel setting is changed locally, and when the setting is changed, the suitability of the setting is judged. It is possible to make a distinction, to unify the shipping model according to the type of fuel without individually providing it, to reduce the cost, to avoid an error during the setting, and to accurately judge whether the setting change is appropriate or not. Done. Moreover, when the fuel suitability determination means determines that the fuel setting change is appropriate, the fuel suitability determination is omitted until the next fuel setting change is performed, so the fuel suitability determination is performed more than necessary. I will not be told. Further, when the fuel suitability determination means determines that the fuel setting change is inappropriate, an alarm is output and the engine is stopped, so that the fuel setting is erroneous and the operation is not continued. , Safe.

The invention according to claim 4 has the following operation.

Since the setting change of the fuel corresponds to the type of fuel, it is possible to perform the fuel control according to the type of fuel, and it is most suitable for the control of the engine drive device corresponding to various fuels.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a refrigerant circuit in an air conditioner of standard specifications to which an embodiment of the air conditioner according to the present invention is applied.

As shown in FIG. 1, a heat pump type air conditioner 10 as a refrigerating device has an outdoor unit 11, a plurality (for example, two) of indoor units 12A and 12B, and a controller 13 such as a microcomputer. The outdoor refrigerant pipe 14 of the outdoor unit 11 and the indoor refrigerant pipes 15A and 15B of the indoor units 12A and 12B are connected to each other.

The outdoor unit 11 is installed outdoors, a compressor 16 is provided in the outdoor refrigerant pipe 14, and an accumulator 17 is provided on the suction side of the compressor 16 and a four-way valve 18 is provided on the discharge side. The outdoor heat exchanger 19, the outdoor expansion valve 24, and the dry core 25 are sequentially arranged on the four-way valve 18 side. An outdoor fan 20 that blows air toward the outdoor heat exchanger 19 is arranged adjacent to the outdoor heat exchanger 19. The compressor 16 is connected to the gas engine 30 via a flexible coupling 27 and the like, and is driven by the gas engine 30. Further, a bypass pipe 26 is arranged to bypass the outdoor expansion valve 24.

On the other hand, the indoor units 12A and 12B are installed indoors, respectively, and indoor refrigerant pipes 15A and 1A, respectively.
5B is provided with indoor heat exchangers 21A and 21B, and indoor expansion valves 22A and 21A are provided near the indoor heat exchangers 21A and 21B in the indoor refrigerant pipes 15A and 15B, respectively.
22B is arranged and configured. The indoor heat exchanger 21
A and 21B have these indoor heat exchangers 21A and 21B, respectively.
The indoor fans 23A and 23B that blow the air are arranged adjacent to each other.

Reference numeral 28 in FIG. 1 represents a strainer. Reference numeral 29 is a safety valve that releases the refrigerant pressure on the discharge side of the compressor 16 to the suction side of the compressor 16.

The control device 13 is installed in the outdoor unit 11 and controls the operation of the outdoor unit 11 and the indoor units 12A and 12B. Specifically, the control device 13 controls the gas engine 30 (that is, the compressor 16) and the four-way valve 1 in the outdoor unit 11.
8, the outdoor fan 20 and the outdoor expansion valve 24, and the indoor expansion valves 22A and 22B and the indoor fans 23A and 23B in the indoor units 12A and 12B, respectively. Further, the control device 13 controls a circulation pump 47 of the engine cooling device 41 described later.

By switching the four-way valve 18 by the control device 13, the heat pump type air conditioner 1
0 is set to the cooling operation or the heating operation. That is, when the control device 13 switches the four-way valve 18 to the cooling side,
The refrigerant flows as indicated by the solid arrow, the outdoor heat exchanger 19 serves as a condenser, and the indoor heat exchangers 21A, 21B serve as evaporators to enter a cooling operation state, and the indoor heat exchangers 21A, 21B cool the room. When the control device 13 switches the four-way valve 18 to the heating side, the refrigerant flows as indicated by the broken line arrow, the indoor heat exchangers 21A and 21B serve as condensers, and the outdoor heat exchanger 1
9 becomes an evaporator and enters a heating operation state, and the indoor heat exchangers 21A and 21B heat the interior of the room.

Further, the control device 13 is
The valve opening degree of each of the indoor expansion valves 22A and 22B is controlled according to the air conditioning load. During heating operation, the control device 13
Controls the valve openings of the outdoor expansion valve 24 and the indoor expansion valves 22A and 22B according to the air conditioning load.

On the other hand, an air-fuel mixture is supplied from an engine fuel supply device 31 to a combustion chamber (not shown) of the gas engine 30 which drives the compressor 16. This engine fuel supply device 31 includes two fuel cutoff valves 3 in a fuel supply pipe 32.
3, a zero governor 34, a fuel adjusting valve 35, and an actuator 36 are sequentially arranged, and an end portion of the fuel supply pipe 32 on the actuator 36 side is connected to the combustion chamber of the gas engine 30.

The two fuel cutoff valves 33 are arranged in series to form a two-closed type fuel cutoff valve mechanism, and the two fuel cutoff valves 33 are interlocked to be fully closed or fully opened so that the fuel gas Selectively implement leak-proof shutoff and communication.

The zero governor 34 is a fuel supply pipe 32.
Among the primary side fuel gas pressure (primary pressure a) and the secondary side fuel gas pressure (secondary pressure b) before and after the zero governor 34 in the inside, the secondary pressure b is kept constant by the fluctuation of the primary pressure a. By adjusting the pressure to a predetermined value, the operation of the gas engine 30 is stabilized.

The fuel regulating valve 35 is the actuator 3
The air-fuel ratio of the air-fuel mixture produced by introducing air from the upstream side of 6 is optimally adjusted. Further, the actuator 36 controls the rotation speed of the gas engine 30 by adjusting the supply amount of the air-fuel mixture supplied to the combustion chamber of the gas engine 30.

An engine oil supply device 37 is connected to the gas engine 30. The engine oil supply device 37 has an oil supply pipe 38 provided with an oil cutoff valve 39, an oil supply pump 40, and the like, and appropriately supplies engine oil to the gas engine 30.

Gas engine 30 by the controller 13
Specifically, the control is performed by the fuel cutoff valve 33 of the engine fuel supply device 31, the zero governor 34, the fuel adjustment valve 35 and the actuator 36, and the engine oil supply device 37.
The oil shutoff valve 39 and the oil supply pump 40 are controlled by the control device 13.

The gas engine 30 is cooled by the engine cooling water circulating in the engine cooling device 41. This engine cooling device 41 is connected to the gas engine 30 through an exhaust gas heat exchanger (not shown) attached to the gas engine 30 at one end, and has a substantially closed loop shape in which the other end is directly connected to the gas engine 30. A wax three-way valve 43, a radiator 46, and a circulation pump 47 are sequentially arranged in the water pipe 42.

The circulation pump 47 raises the pressure of the engine cooling water during operation, and the engine cooling water is cooled by the cooling water pipe 4.
Circulate in 2.

The wax three-way valve 43 is used to quickly warm up the gas engine 30. The wax three-way valve 43 has an inlet 43A for the gas engine 30 in the cooling water pipe 42, a low temperature side outlet 43B for the suction side of the circulation pump 47 in the cooling water pipe 42, and a high temperature side outlet 43C for the radiator in the cooling water pipe 42. 46 is connected to each side.

The engine cooling water flows into the exhaust gas heat exchanger of the gas engine 30 from the discharge side of the circulation pump 47 at about 40 ° C., recovers exhaust heat of the gas engine 30 (heat of exhaust gas), and then recovers the gas engine 30. It flows inside to cool the gas engine 30 and heat it to about 80 ° C. The engine cooling water that has flowed into the wax three-way valve 43 from the gas engine 30 has a low temperature side outlet 4 when the temperature is low (for example, 80 ° C. or lower).
The gas engine 30 is quickly warmed up by returning from 3B to the circulation pump 47, and when the temperature is high (for example, 80 ° C. or higher), it flows from the high temperature side outlet 43C to the radiator 46.

The radiator 46 radiates heat from the engine cooling water to cool the engine cooling water to about 40.degree. The engine cooling water cooled by the radiator 46 is returned to the exhaust gas heat exchanger of the gas engine 30 via the suction side of the circulation pump 47 to cool the gas engine 30. Further, this radiator 46 is used in the air conditioner 1
It is arranged adjacent to the outdoor heat exchanger 19 of No. 0.

During the cooling or heating operation of the air conditioner 10, the circulation pump 47 of the engine cooling device 41 is operated to circulate the engine cooling water, and the engine cooling water cools the gas engine 30. The engine cooling water that has cooled the gas engine 30 is radiated and cooled by the radiator 46. In particular, during the heating operation of the air conditioner 10, the heat radiated by the radiator 46 is taken into the outdoor heat exchanger 19 functioning as an evaporator and used as a heat source for the evaporator.

By the way, the engine fuel supply device 31
As shown in FIGS. 2 and 3, the fuel adjustment valve 35 of FIG.
3 is installed, and a valve lid 50 as a switching member is further installed. This valve lid 50 has a surface 50
When A is mounted outside (FIG. 3 (B)) and when the back surface 50B is mounted outside (FIG. 3 (A))
With this, the flow path of the fuel gas flowing in the fuel adjustment valve 35 is switched, and the flow path area can be changed.

That is, the valve lid 50 has a front surface 50A formed as a flat surface and a recess 52 formed on the back surface 50B. Therefore, as shown in FIG.
When the valve lid 50 is attached to the valve body 51 with the surface 50A facing inward and the surface 50A facing inward, the fuel gas from the zero governor 34 flows only to the electric valve 53 to the actuator 36, and the electric valve 53 moves. The flow rate is adjusted by the valve opening of the. Thus, the selection of the flow path in the fuel adjustment valve 35 that allows the fuel gas to pass only through the motor-operated valve 53 has a large calorific value (about 24,000 kcal / m ³ ), and does not require a large amount of fuel gas. , For example in the case of propane.

As shown in FIG. 3B, the surface 50
When the valve lid 50 is attached to the valve body 51 with A facing outward and the back surface 50B facing inward, the fuel gas from the zero governor 34 not only passes through the electric valve 53, but also the central portion of the valve body 51. The flow rate of a part of the electric current flowing through the flow path formed by the concave portion 52 of the valve lid 50 to the actuator 36 and flowing through the electric valve 53 is adjusted by the valve opening degree of the electric valve 53. In this way, the fuel gas is supplied to the motor-operated valve 53 and the recess 52.
Fuel adjustment valve 35 that passes together with a flow path formed by
The flow path is selected to generate less heat (11,000 kcal
/ M ³ ), a fuel gas type that requires a large amount of fuel gas, for example, 13A.

As shown in FIG. 2B, a protrusion 54 as a switch operating member is provided on the side surface of the valve lid 50. The protrusion 54 presses the valve lid switch 55 shown in FIG. 4 installed in the valve body 51 of the fuel adjustment valve 35, and turns the valve lid switch 55 ON or OFF. As shown in FIG. 3 (A), when the valve lid 50 is attached to the valve body 51 with the back surface 50B facing outward (propane specification), the protrusion 54 does not press the valve lid switch 55. The valve lid switch 55 is turned off. Further, as shown in FIG. 3B, when the valve lid 50 is attached to the valve body 51 with the surface 50A facing outward (13A specification), the protrusion 54 presses the valve lid 50. The valve cover switch 55 is turned on.

When the valve lid switch 55 is turned on and off, the valve lid 50 is attached to the controller 1 shown in FIG.
3 is notified to the CPU 56. That is, the valve lid switch 5
When the OFF signal is transmitted from 5 to the CPU 56,
It is announced that the valve lid 50 is attached with propane specifications, and when the ON signal is transmitted from the valve lid switch 55 to the CPU 56, it is announced that the valve lid 50 is attached with 13A specifications.

On the other hand, the control device 13 includes a plurality of types of control data for controlling the valve opening degree of the motor-operated valve 53 in the fuel regulating valve 35 differently according to the type of fuel gas, for example, propane specification and 13A. A memory 57 (EEPROM or the like) for storing two types of control data of specifications is provided. A plurality of types (two types) of control data in the memory 57 are stored in the DIP switch 58 equipped in the control device 13.
And the like are selected and set according to the type of fuel gas.

When the power is turned on, the CPU 56 of the control device 13 controls the mounting state of the valve lid 50 (that is, the reception of the ON or OFF signal of the valve lid switch 55 serving as the fuel setting means) and the dip switch serving as the fuel setting means. Based on the type of control data in the memory 57 selected and set by 58 or the like, as shown in FIG. 5, it is determined whether or not the fuel setting is changed as the first step (fuel setting mode M1). Since the dip switch 58 is always set at the time of initial installation, it is determined in the determination step S1 that there is a change, and the fuel determination incomplete flag is set in the processing step S2.

Next, the engine starting mode M2 shown in FIG.
Then, in the determination step S3, the presence / absence of the fuel determination flag is determined. Since the fuel determination incomplete flag is set here, the fuel adjustment valve 3 is determined in the determination step S4.
5 determines the second stage of whether or not the type of fuel gas is suitable, and if not, the processing step
In S5, an error stop process is performed, an alarm signal is transmitted to the alarm output unit 59 of the control device 13, and an alarm is output by the alarm output unit 59, and the gas engine 3
Prevent 0 from starting.

That is, in the determination of the second step, the CPU 56 first determines whether the type of control data set in the memory 57 is propane specification or city gas 13A specification, as shown in FIG. To confirm. Next, the CPU 56 turns on the valve lid switch 55 so that the front surface 50A of the valve lid 50 is attached to the outside so as to have the 13A specification (FIG. 3 (B)), or the valve lid switch 55 is turned off. It is operated to confirm whether the back surface 50B of the valve lid 50 is attached to the outside and has a propane specification (FIG. 3 (A)). The CPU 56 determines that there is an error when the type of control data set in the memory 57 and the mounting state of the valve lid 50 do not correspond to the same type of fuel gas (errors in FIG. 8).
), The alarm output unit 59 is caused to output an alarm. in this case,
Returning to the fuel setting mode M1, the fuel setting is changed again.

In the judgment step S4, the fuel adjusting valve 3
5 is suitable for the type of fuel gas, that is, it is determined that the type of control data set in the memory 57 and the mounting state of the valve lid 50 correspond to the same type of fuel gas. In this case, the CPU 56 continues to perform the processing steps.
The gas engine 30 is started in S6, and then the third
Perform stage determination. That is, in the determination step S7 of the engine operating mode M3 shown in FIG. 7, the fuel determination flag is not set yet, so the processing step S7
8, the operation of determining the compatibility of the type of fuel gas with the fuel regulating valve 35 while operating the gas engine 30,
In the determination step S9, it is determined whether the combustion state is possible.

That is, when the CPU 56 determines from the operation data of the gas engine 30 at this time that the gas engine 30 is abnormally burning due to knocking or the like, the air-fuel mixture supplied to the gas engine 30 It is judged that the fuel gas is rich, because the fuel adjustment valve 35 in which the mounting state of the valve lid 50 and the type of control data set in the memory 57 are 13A specifications is used in the propane area. And the type of the fuel gas in the area where the air conditioner 10 is installed and the specifications of the fuel adjustment valve 35 do not match (error in FIG. 8), and in step S10. An alarm is output to the alarm output unit 59 and the engine 30 is stopped.

Further, when the CPU 56 determines from the operation data of the gas engine 30 that the gas engine 30 does not rotate or the rotation speed of the gas engine 30 is insufficient, the mixing is supplied to the gas engine 30. It is judged that the fuel gas in the air is thin, and this is because the fuel adjustment valve 35 in which the mounting state of the valve lid 50 and the type of control data set in the memory 57 are propane specifications is set in the 13A region. It is determined that the air conditioner 10 is used, and the type of fuel gas and the fuel adjustment valve 35 in the area where the air conditioner 10 is installed.
It is judged that there is an error because it does not meet the specifications of (the error in FIG. 8), and an alarm is output to the alarm output unit 59, and the engine 3
Stop 0.

If the CPU 56 determines from the operation data of the gas engine 30 that the gas engine 30 is rotating normally in the determination step S9, the specification of the fuel adjusting valve 35 is determined to be the air conditioner. Determined to be compatible with the type of fuel gas in 10 installed areas,
In process step S11, the fuel determination flag is set and the fuel determination incomplete flag is turned off, and the alarm output unit 59
Does not output an alarm. Then, thereafter, normal control (processing step S12) is performed, and air conditioning operation control by engine control is performed. In this way, once the fuel determination flag is set, until the next fuel setting change in the fuel setting mode M1, the fuel type matching determination in the engine starting mode M2 and the fuel suitability determination in the engine operating mode M3 are performed. It will not be performed, and the engine start and normal control will be performed smoothly. Of course, if the fuel setting is changed for any reason, the fuel setting mode
In the processing step S2 of M1, the fuel determination incomplete flag is set, and the above-mentioned operation is repeated.

Specifically, in the air conditioner 10,
All fuel adjustment valves 35 were shipped from the factory as 13A specifications,
When the type of fuel gas in the area where the air conditioner 10 is installed is propane, the operator who installs the air conditioner 10
The valve lid 50 of the fuel adjusting valve 35 is reattached so that the back surface 50B faces outward and changed to the propane specification, and the dip switch 58 is operated to change the control data of the memory 57 to the propane specification. Then, the air conditioner 10
When the power is turned on, the CPU 56 of the control device 13
Performs the above-described first-stage, second-stage, and third-stage determinations in sequence, determines the compatibility between the fuel adjustment valve 35 and the type of fuel gas and the combustion state, and determines the fuel suitability based on the fuel setting change. I do.

With the above-mentioned configuration, the following effects (1) and (2) are obtained according to the above-described embodiment.

(1) Fuel setting means (valve lid switch 55 and dip switch 58) for setting the fuel supplied to the engine 30, and setting change determination for determining whether or not the setting is changed by this fuel setting means. Means (CPU
56) and a fuel suitability judging means (CPU 56) for judging whether there is a setting change by the setting change judging means and judging whether the setting change is suitable when the engine 30 is driven. The fuel settings can be changed, and when the settings are changed, the suitability of the settings can be determined, and the shipping models can be unified according to the type of fuel without providing them individually. There is no error on the way, and the appropriateness of the setting change can be accurately determined. Moreover, when the fuel suitability determination means determines that the fuel setting change is appropriate, the fuel suitability determination is omitted until the next fuel setting change is performed, so the fuel suitability determination is performed more than necessary. It is possible to prevent it from being broken and to smoothly shift to normal control.
Furthermore, when the fuel suitability determination means determines that the fuel setting change is inappropriate, an alarm is output and the engine 30 is stopped, so that the operation may be continued while the fuel setting is incorrect. Not safe.

(2) Change of fuel setting is propane, 13
Since it corresponds to the type of fuel such as A, it is possible to perform fuel control according to the type of fuel, and it is most suitable for the control of engine drive equipment corresponding to various fuels.

Although the present invention has been described based on the above embodiment, the present invention is not limited to this.
The present invention can be applied not only to a gas engine but also to a liquid fuel engine, and can be applied to a control device for an engine driving device such as an engine driving power generator in addition to an air conditioner.

[0052]

As described above, according to the control device of the engine drive device of the present invention, the shipping models can be unified regardless of the type of fuel, and the cost can be reduced, and the setting of the fuel can be changed. It is possible to accurately determine the suitability of.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of an air conditioner according to the present invention.

FIG. 2 is a perspective view showing a fuel adjusting valve and the like of FIG.

FIG. 3 is a front view schematically showing the fuel control valve of FIG.

FIG. 4 is a block diagram showing the control device of FIG. 1 together with a valve lid of a fuel regulating valve.

5 is a flowchart for explaining the operation of the control device of FIG. 1 in a fuel setting mode.

FIG. 6 is a flowchart for explaining an operation of the control device of FIG. 1 in an engine start mode.

7 is a flowchart for explaining the operation of the control device of FIG. 1 in an engine operation mode.

FIG. 8 is a chart showing the compatibility relationship between the type of fuel gas, the setting in the memory of the control device, and the mounting state of the valve lid of the fuel adjustment valve.

[Explanation of symbols]

10 Air conditioner (engine drive) 13 Control device 30 gas engine 55 Valve lid switch (fuel setting means) 56 CPU (setting change judging means, fuel suitability judging means) 58 DIP switch (fuel setting means) 59 Alarm output section

Claims (4)

[Claims] 1. An engine drive device driven by an engine, comprising: a fuel setting means for setting a fuel supplied to the engine; and a setting change determining means for determining whether or not the setting is changed by the fuel setting means. A control device for an engine drive device, comprising: a fuel suitability judging means for judging whether or not the setting change has been made by the setting change judging means, and for judging whether the setting change is suitable when the engine is driven. 2. In an engine drive device driven by an engine, fuel setting means for setting fuel supplied to the engine, and setting change determining means for determining whether or not the setting is changed by the fuel setting means. And a fuel suitability judging means for judging whether the setting change has been made by the setting change judging means and for judging whether the setting change is suitable when the engine is driven. The fuel suitability judging means appropriately changes the fuel setting. The control device for the engine drive device is characterized in that when it is determined that the fuel is appropriate, the determination as to whether or not the fuel is appropriate is omitted until the next fuel setting is changed. 3. When the fuel suitability determination means determines that the fuel setting change is inappropriate, an alarm is output and the engine is stopped. Alternatively, the control device for the engine drive device according to claim 2. 4. The control device for an engine drive device according to claim 1, wherein the setting change of the fuel corresponds to the type of the fuel.