Three-fuel control system, three-fuel engine and generator set

Abstract

The utility model discloses a three-fuel control system, a three-fuel engine and a generator set, and the three-fuel control system comprises a fuel selection module, a fuel supply control module, a fuel oil supply system, a first fuel gas supply system, a second fuel gas supply system and a fuel gas injection rail, the fuel gas injection rail is provided with a gas inlet, a first gas outlet, a second gas outlet, a first electromagnetic valve and a second electromagnetic valve, fuel gas outlets of the first fuel gas supply system and the second fuel gas supply system are both communicated with the gas inlet of the fuel gas injection rail, and the first gas outlet and the second gas outlet of the fuel gas injection rail are both communicated with a fuel gas inlet channel of an engine. The fuel selection module, the first electromagnetic valve, the second electromagnetic valve and the fuel supply system are electrically connected with the fuel supply control module. According to the method, the air inflow of different fuel gases of the multi-fuel engine can be better controlled, and the operation stability of the engine is effectively improved.

Description

Technical Field

[0001] The present application belongs to the technical field of multi-fuel engines, and in particular, relates to a three-fuel control system, a three-fuel engine and a generator set. Background Art

[0002] At present, most multi-fuel engines on the market are dual-fuel engines that use fuel oil and a type of gas, and the fuel feed control components of the existing multi-fuel system are mostly carburetors. The fuel channel connected to the carburetors is blocked by a solenoid valve to achieve the purpose of fuel / gas switching. When the engine uses gas, a diaphragm-type pressure reducing valve (secondary pressure reducing valve) uses negative pressure to open the diaphragm during the intake stroke (non-electrical control method) to achieve the effect of gas injection into the cylinder. However, the distance from the secondary pressure reducing valve to the throat of the carburetors is usually more than 1m. In the method of using negative pressure suction to allow gas to enter the engine, the gas has a large pressure loss in the process from the secondary pressure reducing valve to the throat of the carburetors, which makes it difficult to accurately control the gas intake amount, resulting in poor intake effect; and when there are two or more types of gas, because multiple gases in the existing multi-fuel system share a set of gas channels (that is, different fuels share a gas outlet to enter the engine), the characteristics of different gases are very different, which will also bring great difficulties to the matching of the gas intake amount of the engine for different gases.

[0003] In summary, it can be seen that the existing control system that uses a carburetor, a solenoid valve and a diaphragm pressure reducing valve to realize fuel feeding is difficult to accurately control the intake amount of the fuel gas, resulting in poor intake effect, resulting in poor stability of engine operation when using fuel gas as fuel. Utility Model Content

[0004] In view of the defects in the prior art, the purpose of this application is to provide a three-fuel control system, a three-fuel engine and a generator set, which can better control the intake amount of different fuel gases of a multi-fuel engine and effectively improve the stability of engine operation.

[0005] In order to achieve the above objectives, this application provides the following solutions:

[0006] According to a first aspect of the present application, the present application provides a three-fuel control system, including a fuel selection module, a fuel supply control module, a fuel oil supply system, a first fuel gas supply system, a second fuel gas supply system and a fuel injection rail.

[0007] The gas injection rail has an air inlet, a first air outlet, a second air outlet, a first solenoid valve and a second solenoid valve. The gas outlets of the first gas supply system and the second gas supply system are both connected to the air inlet of the gas injection rail. The first air outlet and the second air outlet of the gas injection rail are both connected to the gas intake passage of the engine.

[0008] The fuel selection module, the first solenoid valve, the second solenoid valve and the fuel supply system are electrically connected to the fuel supply control module respectively, wherein:

[0009] The first solenoid valve is used to control the opening and closing of the first air outlet, and the second solenoid valve is used to control the opening and closing of the second air outlet.

[0010] The fuel selection module is used to accept user operations and output a fuel type electrical signal corresponding to the currently selected fuel type.

[0011] The fuel supply control module is used to control the operation of the fuel supply system, the first solenoid valve and the second solenoid valve according to the fuel type electrical signal so that the corresponding fuel enters the engine cylinder, and outputs a PWM pulse signal to the first solenoid valve and / or the second solenoid valve to control the intake amount of the fuel gas by controlling the opening frequency of the first solenoid valve and the second solenoid valve.

[0012] Preferably, the fuel selection module comprises a fuel selection switch and a switch signal conversion circuit, the fuel selection switch is connected to the signal input end of the switch signal conversion circuit, and the signal output end of the switch signal conversion circuit is connected to the first signal input end of the fuel supply control module, wherein:

[0013] The fuel selection switch is used for the user to perform a fuel selection operation, and the switch signal conversion circuit is used to output a voltage signal corresponding to the currently selected fuel type to the fuel supply control module according to the user operation.

[0014] Preferably, the fuel selection switch is a three-speed switch.

[0015] Preferably, the switch signal conversion circuit includes a first resistor, the fuel selection switch includes a moving contact and three static contacts, the moving contact of the fuel selection switch is connected to the first signal input end of the fuel selection module, the first static contact of the fuel selection switch is grounded, the second static contact is suspended, and the third static contact is grounded through the first resistor.

[0016] Preferably, the three-fuel control system also includes a throttle body, on which is provided a fuel inlet nozzle, a first air inlet nozzle and a second air inlet nozzle, the fuel inlet nozzle on the throttle body being connected to the fuel outlet of the fuel supply system, the first air inlet nozzle on the throttle body being connected to the gas outlet of the first gas supply system, and the second air inlet nozzle on the throttle body being connected to the gas outlet of the second gas supply system.

[0017] Preferably, the three-fuel control system also includes a first-level pressure reducing valve, the gas outlets of the first gas supply system and the second gas supply system are respectively connected to the air inlet of the first-level pressure reducing valve, and the air outlet of the first-level pressure reducing valve is connected to the air inlet of the gas injection rail.

[0018] Preferably, the three-fuel control system further comprises a control panel, and the fuel selection module is arranged on the control panel.

[0019] Preferably, the fuel supply control module is an ECU.

[0020] According to a second aspect of the present application, the present application provides a three-fuel engine, comprising a three-fuel control system as described in any one of the first aspects above.

[0021] According to a third aspect of the present application, the present application provides a generator set, comprising the three-fuel engine described in the second aspect above.

[0022] Due to the adoption of the above technical solution, this application has the following beneficial effects:

[0023] The present application sets a gas injection rail, and sets an air inlet and two air outlets on the gas injection rail, and sets solenoid valves on the two air outlets to control their opening and closing, so that the fuel supply system, the first solenoid valve and the second solenoid valve can be controlled by the fuel supply control module according to the fuel type electrical signal output by the fuel selection module, so that the corresponding fuel enters the engine cylinder, and the PWM pulse signal is output to the first solenoid valve and / or the second solenoid valve through the fuel supply control module, so as to control the intake amount of the gas by controlling the opening frequency of the first solenoid valve and the second solenoid valve. In summary, the present application can better control the intake amount of different gases of the multi-fuel engine and effectively improve the stability of the engine operation.

[0024] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation of the present application or the technical solution in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation or the prior art description. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without paying creative work.

[0026] Figure 1It is a structural schematic diagram of a third fuel control system in an embodiment of the present application;

[0027] Figure 2 1 is a circuit diagram of a fuel selection module in one embodiment of the present application. DETAILED DESCRIPTION

[0028] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0029] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined.

[0030] In this application, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] like Figure 1-2 As shown, an embodiment of the present application provides a three-fuel control system, including a fuel selection module 1, a fuel supply control module 2, a fuel oil supply system 3, a first gas supply system 4, a second gas supply system 5 and a gas injection rail 6.

[0033] Specifically, the gas injection rail 6 has an air inlet, a first air outlet, a second air outlet, a first solenoid valve 61 and a second solenoid valve 62. The gas outlets of the first gas supply system 4 and the second gas supply system 5 are both connected to the air inlet of the gas injection rail 6. The first air outlet and the second air outlet of the gas injection rail 6 are both connected to the gas intake channel of the engine. The fuel selection module 1, the first solenoid valve 61, the second solenoid valve 62 and the fuel supply system 3 are electrically connected to the fuel supply control module 2 respectively.

[0034] Specifically, the first solenoid valve 61 is used to control the opening and closing of the first air outlet, the second solenoid valve 62 is used to control the opening and closing of the second air outlet, the fuel selection module 1 is used to accept user operations and output a fuel type electrical signal corresponding to the currently selected fuel type, and the fuel supply control module 2 is used to control the fuel supply system 3, the first solenoid valve 61 and the second solenoid valve 62 according to the fuel type electrical signal to allow the corresponding fuel to enter the engine cylinder, and output a PWM pulse signal to the first solenoid valve 61 and / or the second solenoid valve 62 to control the intake amount of the fuel by controlling the opening frequency of the first solenoid valve 61 and the second solenoid valve 62.

[0035] The working principle of the three-fuel control system in this embodiment is as follows:

[0036] Before the engine is started, the user selects the target fuel by operating the fuel selection module 1. The fuel selection module 1 outputs a fuel type electrical signal corresponding to the currently selected fuel type based on the user operation. When and after the engine is started, the fuel supply control module 2 receives the fuel type electrical signal input by the fuel selection module 1, and controls the operation of the corresponding components in the fuel supply system 3, the first solenoid valve 61 and the second solenoid valve 62 according to the fuel type electrical signal, so that the corresponding fuel enters the engine cylinder. At the same time, when the selected fuel is gas, the fuel supply control module 2 outputs a PWM pulse signal to the first solenoid valve 61 and / or the second solenoid valve 62, and controls the gas intake amount by controlling the opening frequency of the first solenoid valve 61 and the second solenoid valve 62, thereby achieving accurate control of the gas intake amount.

[0037] like Figure 1As shown, the three-fuel control system of this embodiment is provided with a gas injection rail 6, and an air inlet and two air outlets are provided on the gas injection rail 6, and solenoid valves are respectively provided on the two air outlets to control their opening and closing, so that the fuel supply system 3, the first solenoid valve 61 and the second solenoid valve 62 can be controlled by the fuel supply control module 2 according to the fuel type electrical signal output by the fuel selection module 1, so that the corresponding fuel enters the engine cylinder, and the PWM pulse signal is output to the first solenoid valve 61 and / or the second solenoid valve 62 through the fuel supply control module 2, so as to control the intake amount of the gas by controlling the opening frequency of the first solenoid valve 61 and the second solenoid valve 62. In summary, the present application can better control the intake amount of different gases of the multi-fuel engine and effectively improve the stability of the engine operation.

[0038] It should be noted that the three-fuel control system of this embodiment is applicable to dual-fuel engines that use fuel oil and one type of gas as fuel, and is also applicable to three-fuel engines that use fuel oil and two different gases (such as LPG (liquefied petroleum gas) and NG (natural gas)) as fuel.

[0039] like Figure 2 As shown, in one embodiment, the fuel selection module 1 includes a fuel selection switch 11 and a switch signal conversion circuit 12, the fuel selection switch 11 is connected to the signal input end of the switch signal conversion circuit 12, and the signal output end of the switch signal conversion circuit 12 is connected to the first signal input end of the fuel supply control module 2, wherein,

[0040] The fuel selection switch 11 is used for the user to perform a fuel selection operation, and the switch signal conversion circuit 12 is used to output a voltage signal corresponding to the currently selected fuel type to the fuel supply control module 2 according to the user operation.

[0041] During use, the user operates the fuel selection switch 11 to switch the fuel currently required to be used. The switch signal conversion circuit 12 outputs a corresponding voltage signal according to the user operation to represent the type of fuel currently selected by the user. The fuel supply control module 2 identifies the fuel currently required to be used by the engine according to the voltage signal output by the switch conversion circuit, thereby selecting the corresponding preset control program to control the operation of the fuel supply system 3, the first solenoid valve 61 and the second solenoid valve 62.

[0042] Specifically, Figure 2 As shown, in this embodiment, the fuel selection switch 11 is a three-speed switch. The three-speed switch has three working positions, each of which represents a fuel selection signal. The user can select the fuel type by operating the three-speed switch to place it in the corresponding working position.

[0043] It should be noted that the three-speed switch can be a three-speed button switch or a three-speed knob switch, or it can be a combination of a single-pole three-throw electronic switch + a fuel selection button. For the three-speed button switch and the three-speed knob switch, the corresponding fuel can be selected by turning or rotating the switch to the corresponding gear position. For the combination of a single-pole three-throw electronic switch + a fuel selection button, the user can control the single-pole three-throw electronic switch to switch to the corresponding working state by pressing the fuel selection button.

[0044] like Figure 2 As shown, in one embodiment, the switch signal conversion circuit 12 includes a first resistor 121, the fuel selection switch 11 includes a moving contact and three static contacts, the moving contact of the fuel selection switch 11 is connected to the first signal input terminal of the fuel selection module 1, the first static contact of the fuel selection switch 11 is grounded, the second static contact is suspended, and the third static contact is grounded through the first resistor 121. In this way, when the fuel selection switch 11 is in different switch states, the voltage signal output by the switch signal conversion circuit 12 to the fuel supply control module 2 is also different, so that the fuel supply control module 2 identifies the type of the current fuel according to different voltage signals.

[0045] like Figure 1 As shown, in one embodiment, the three-fuel control system also includes a throttle body 7, on which is provided a fuel inlet nozzle, a first air inlet nozzle and a second air inlet nozzle, the fuel inlet nozzle on the throttle body 7 is connected to the fuel outlet of the fuel supply system 3, the first air inlet nozzle on the throttle body 7 is connected to the gas outlet of the first gas supply system 4, and the second air inlet nozzle on the throttle body 7 is connected to the gas outlet of the second gas supply system 5.

[0046] The fuel selection module 1 can control the opening and closing of the corresponding solenoid valve according to the fuel type electrical signal output by the fuel selection module 1, thereby controlling the opening of the corresponding air outlet on the gas injection rail 6, so that the corresponding air outlet on the gas injection rail 6 is connected to the corresponding air intake nozzle connected to the throttle body 7, so that the corresponding gas enters the intake valve body through the corresponding air outlet on the gas injection rail 6 and finally enters the engine intake duct.

[0047] like Figure 1 As shown, in one embodiment, the three-fuel control system also includes a first-stage pressure reducing valve 8, and the gas outlets of the first gas supply system 4 and the second gas supply system 5 are respectively connected to the air inlet of the first-stage pressure reducing valve 8, and the air outlet of the first-stage pressure reducing valve 8 is connected to the air inlet of the gas injection rail 6.

[0048] The first-stage pressure reducing valve 8 is also called a gas pressure reducing valve (gas pressure regulator), commonly known as a pressure regulator. It can keep the outlet gas at a specified pressure by automatically changing the gas flow through the pressure reducing valve, so that no matter how the gas flow and upstream pressure change, the downstream pressure (the gas pressure entering the engine) can be kept stable, thereby improving the stability of the intake volume and further improving the stability of the engine operation.

[0049] Specifically, in this embodiment, the first resistor 121 selects a resistor with a relatively large resistance (for example, 10KΩ); the first solenoid valve 61 and the second solenoid valve 62 can specifically adopt normally closed solenoid valves; the fuel supply control module 2 is the ECU of the engine; the first fuel supply system 4 supplies LPG (liquefied petroleum gas), and the second fuel supply system supplies NG (natural gas).

[0050] In this way, when the ECU recognizes the suspended signal, the fuel supply control module 2 does not output, so that the first solenoid valve 61 and the second solenoid valve 62 are in a closed state. At this time, the fuel supply system 3 works, and the fuel enters the fuel injection nozzle on the throttle body 7 through the high-pressure oil pipe under the action of the oil pump, and finally sprays into the engine intake duct;

[0051] When the ECU recognizes the ground signal, the injector is closed, and the ECU controls the first solenoid valve 61 to be powered on and opened, so that the first outlet of the gas injection rail 6 is connected with the air inlet of the gas injection rail 6, and the LPG enters the gas injection rail 6 through the first-stage pressure reducing valve 8, and enters the first air inlet nozzle of the throttle body 7 through the first air outlet of the gas injection rail 6, and finally enters the engine intake passage. At this time, the ECU controls the opening and closing of the first solenoid valve 61 by outputting a PWM pulse signal to the first solenoid valve 61, thereby controlling the intake amount of the LPG gas by controlling the opening frequency of the first solenoid valve 61;

[0052] When the ECU recognizes the 10K resistance signal, the injector is closed, and the ECU controls the first solenoid valve 61 and the second solenoid valve 62 to be powered on and opened, and the NG enters the gas injection rail 6 through the first-stage pressure reducing valve 8, so that the first air outlet and the second air outlet of the gas injection rail 6 are connected to the air inlet of the gas injection rail 6, and the NG enters the gas injection rail 6 through the first-stage pressure reducing valve 8, and enters the first air intake nozzle and the second air intake nozzle of the throttle body 7 through the first air outlet and the second air outlet of the gas injection rail 6 respectively, and finally all enters the engine intake duct. At this time, the ECU controls the opening and closing of the first solenoid valve 61 and the second solenoid valve 62 by outputting PWM pulse signals to the first solenoid valve 61 and the second solenoid valve 62, thereby controlling the intake amount of the NG gas by controlling the opening frequency of the first solenoid valve 61 and the second solenoid valve 62.

[0053] It should be noted that, in the present embodiment, the gas intake amount can be controlled by selectively controlling the first gas outlet and the second gas outlet of the gas injection rail 6 to be opened separately or simultaneously according to the properties of the gas fuel. Since the LPG intake pressure is relatively large and the NG intake pressure is relatively small, in order to ensure the intake amount of NG, in the present embodiment, when LPG is used as the engine fuel, only the first gas outlet of the gas injection rail 6 is controlled to discharge gas, and when NG is used as the engine fuel, both the first gas outlet and the second gas outlet of the gas injection rail 6 are controlled to discharge gas, thereby better ensuring that the intake amount of NG meets the use requirements of the engine.

[0054] Specifically, in actual use, the ECU can also be used to calibrate the MAP diagrams of different fuels separately, and each fuel does not affect each other, so that the gas injection timing can be adjusted more accurately so that the gas pulse width just falls into the intake stroke and the fuel can be fully burned.

[0055] Specifically, in one embodiment, the three-fuel control system further includes a control panel 9, and the fuel selection module 1 is disposed on the control panel 9. In this way, the user can operate the fuel selection module 1 on the control panel 9, thereby improving the convenience of operation.

[0056] The embodiment of the present application also provides a three-fuel engine, including the three-fuel control system in any of the above embodiments. The working principle of the three-fuel engine in terms of fuel control is the same as that of the above three-fuel control system, and has the same effective effect as the above three-fuel control system, which will not be repeated here.

[0057] The present application also provides a generator set, including the three-fuel engine in the above embodiment. The working principle of the generator set in terms of fuel control is the same as that of the three-fuel engine, and has the same effective effect as the three-fuel engine, which will not be repeated here.

[0058] Specifically, the generator set in this embodiment may be a general generator set, which can be applied to vehicles, lawn mowers, mobile power supply systems and other fields.

[0059] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application.

Claims

1. A three-fuel control system, characterized in that: It includes a fuel selection module, a fuel supply control module, a fuel supply system, a first fuel gas supply system, a second fuel gas supply system and a fuel injection rail. The gas injection rail has an air inlet, a first air outlet, a second air outlet, a first solenoid valve and a second solenoid valve. The gas outlets of the first gas supply system and the second gas supply system are both connected to the air inlet of the gas injection rail. The first air outlet and the second air outlet of the gas injection rail are both connected to the gas intake passage of the engine. The fuel selection module, the first solenoid valve, the second solenoid valve and the fuel supply system are electrically connected to the fuel supply control module respectively, wherein: The first solenoid valve is used to control the opening and closing of the first air outlet, and the second solenoid valve is used to control the opening and closing of the second air outlet. The fuel selection module is used to accept user operations and output a fuel type electrical signal corresponding to the currently selected fuel type. The fuel supply control module is used to control the operation of the fuel supply system, the first solenoid valve and the second solenoid valve according to the fuel type electrical signal so that the corresponding fuel enters the engine cylinder, and outputs a PWM pulse signal to the first solenoid valve and / or the second solenoid valve to control the intake amount of the fuel gas by controlling the opening frequency of the first solenoid valve and the second solenoid valve.

2. The three-fuel control system according to claim 1, characterized in that: The fuel selection module includes a fuel selection switch and a switch signal conversion circuit, wherein the fuel selection switch is connected to the signal input end of the switch signal conversion circuit, and the signal output end of the switch signal conversion circuit is connected to the first signal input end of the fuel supply control module, wherein: The fuel selection switch is used for the user to perform a fuel selection operation, and the switch signal conversion circuit is used to output a voltage signal corresponding to the currently selected fuel type to the fuel supply control module according to the user operation.

3. The three-fuel control system according to claim 2, characterized in that: The fuel selection switch is a three-speed switch.

4. The three-fuel control system according to claim 3, characterized in that: The switch signal conversion circuit includes a first resistor, and the fuel selection switch includes a moving contact and three static contacts. The moving contact of the fuel selection switch is connected to the first signal input end of the fuel selection module, the first static contact of the fuel selection switch is grounded, the second static contact is suspended, and the third static contact is grounded through the first resistor.

5. The three-fuel control system according to claim 1, characterized in that: It also includes a throttle body, on which is provided an oil inlet nozzle, a first air inlet nozzle and a second air inlet nozzle, the oil inlet nozzle on the throttle body is connected to the fuel outlet of the fuel supply system, the first air inlet nozzle on the throttle body is connected to the gas outlet of the first gas supply system, and the second air inlet nozzle on the throttle body is connected to the gas outlet of the second gas supply system.

6. The three-fuel control system according to claim 1, characterized in that: It also includes a first-stage pressure reducing valve, wherein the gas outlets of the first gas supply system and the second gas supply system are respectively connected to the air inlet of the first-stage pressure reducing valve, and the air outlet of the first-stage pressure reducing valve is connected to the air inlet of the gas injection rail.

7. The three-fuel control system according to claim 1, characterized in that: A control panel is also included, and the fuel selection module is arranged on the control panel.

8. The three-fuel control system according to any one of claims 1 to 7, characterized in that: The fuel supply control module is an ECU.

9. A three-fuel engine, characterized in that: Includes the three-fuel control system as described in any one of claims 1-8.

10. A generator set, characterized in that: Including the three-fuel engine as described in claim 9.

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