Multi-fuel generator set

Abstract

The utility model discloses a multi-fuel generator set, which comprises a fuel selection switch used for outputting target selection signals of corresponding fuels; the controller is used for receiving a target selection signal output by the fuel selection switch, controlling the electromagnetic valve of the corresponding fuel to perform fuel switching based on the selection signal, and outputting a first fuel signal at the same time; the instrument is used for receiving the fuel signal output by the controller and outputting a second fuel signal at the same time; and the frequency converter is used for receiving a second fuel signal output by the instrument, at least two accelerator rotating speed curves are preset in the frequency converter, the accelerator rotating speed curve corresponding to the target selection signal is selected and obtained based on the second fuel signal, and the rotating speed of the engine is controlled according to the corresponding accelerator rotating speed curve. The problem that the performance of a multi-fuel generator set cannot be brought into full play due to the fact that the multi-fuel generator set sets a single rotating speed curve for different fuels is solved, and the power generation performance and economic benefits can be better considered when the multi-fuel generator set uses different fuels.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of generator sets, and particularly relates to a multi-fuel generator set. BACKGROUND

[0002] In a conventional variable frequency generator, no speed curve is designed for different fuels, so that when a fuel with low combustion value is used, the speed cannot reach the maximum rated speed, thereby failing to exert the designed power. Taking an 8kW generator as an example, the program is set as follows: when the generator outputs 8kW, the speed is 3600r / min; when the generator outputs 6.4kW, the speed is controlled at 3200r / min, so as to save fuel. When the generator uses GAS fuel, the generator can operate normally. However, when the generator uses NG fuel with low combustion value, the generator can only output 6.4kW at 3600r / min. However, the program is set as follows: when the generator outputs 6.4kW, the frequency converter controls the speed at 3200r / min. At this time, the power cannot meet the 6.4kW electric power output, thereby causing the voltage of the whole machine to decrease and even causing the load to collapse. SUMMARY

[0003] In view of the deficiencies of the prior art, the purpose of the present application is to provide a multi-fuel generator set which can make the engine reach the maximum rated speed when different fuels are used, so as to solve the problems in the background.

[0004] To achieve the above purpose, the present application adopts the following technical scheme: a generator set comprises a fuel selection switch for outputting a target selection signal of corresponding fuel; a controller for receiving the target selection signal output by the fuel selection switch and controlling the fuel switching of the electromagnetic valve of the corresponding fuel based on the selection signal, and outputting a first fuel signal; an instrument for receiving the first fuel signal output by the controller and outputting a second fuel signal; and a frequency converter for receiving the second fuel signal output by the instrument, and the frequency converter is provided with at least two throttle speed curves, and the frequency converter selects the throttle speed curve corresponding to the target selection signal based on the second fuel signal and controls the speed of the engine according to the corresponding throttle speed curve.

[0005] Further, the throttle speed curve at least comprises a fuel throttle speed curve and a gas throttle speed curve.

[0006] Further, the instrument displays the fuel state corresponding to the second fuel signal.

[0007] Further, the generator set further comprises a throttle stepping motor, and the frequency converter selects the throttle speed curve corresponding to the target selection signal based on the second fuel signal to control the throttle stepping motor to control the opening degree of the throttle to control the speed of the engine of the multi-fuel generator set.

[0008] In summary, the utility model contains following at least one beneficial effect: through in the frequency converter at least for two kinds of fuel different throttle speed curve, eliminated the multi -fuel generator set to different fuel setting single speed curve leads to cannot give full play to own performance problem, make multi -fuel generator set when using different fuel can better give consideration to power generation performance and economic efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 For the generator set control structure schematic diagram of the application.

[0010] Figure 2 For the speed and fuel, power relationship curve schematic diagram of the application.

[0011] BRIEF DESCRIPTION OF DRAWINGS:

[0012] Fuel selection switch 1 Controller 2 Instrument 3 Frequency converter 4 Throttle stepper motor 5. DETAILED DESCRIPTION

[0013] The following through specific concrete example explains the embodiment of the utility model, and the person skilled in the art can easily understand the other advantages and efficacy of the utility model from the content disclosed in the specification. The utility model can also be implemented or applied by another different specific embodiment, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model.

[0014] As Figures 1-2 The application discloses a kind of multi-fuel generator sets, including fuel selection switch 1, for output corresponding fuel target selection signal;Controller 2, for receiving the target selection signal of fuel selection switch 1 output, and based on selection signal control corresponding fuel solenoid valve carries out fuel switching, simultaneously output first fuel signal;Instrument 3, for receiving the first fuel signal of controller 2 output, and display fuel state at this time, simultaneously output second fuel signal;Frequency converter 4, for receiving the second fuel signal of instrument 3 output, and frequency converter 4 at least pre-set has two throttle speed curves, based on second fuel signal selection acquisition target selection signal corresponding throttle speed curve and set the speed of engine according to corresponding throttle speed curve.This embodiment, eliminated the multi -fuel generator set to different fuel setting single speed curve leads to cannot give full play to own performance problem, make multi -fuel generator set when using different fuel can better give consideration to power generation performance and economic efficiency.

[0015] As Figure 1As shown, taking a three-fuel generator set as an example, the three-fuel generator set is provided with an LPG electromagnetic valve, a GAS electromagnetic valve and an NG electromagnetic valve, the controller 2 is in communication connection with the LPG electromagnetic valve, the GAS electromagnetic valve and the NG electromagnetic valve respectively, and the frequency converter 4 of the generator set respectively presets different speed curves, i.e. LPG throttle speed curve, GAS throttle speed curve and NG throttle speed curve, for different fuels. When a user selects LPG fuel through the fuel selection switch 1 arranged on the panel of the multi-fuel generator set, the fuel selection switch 1 outputs a target selection signal as an LPG fuel signal to the controller 2; after receiving the LPG fuel signal, the controller 2 controls the LPG electromagnetic valve to open for fuel switching, and at the same time, the controller 2 outputs an LPG fuel signal (a first fuel signal) to the instrument 3; after receiving the LPG fuel signal (the first fuel signal), the instrument 3 displays the selected LPG fuel state at this time and delivers an actual state LPG fuel signal (a second fuel signal) to the frequency converter 4; the frequency converter 4 determines the LPG fuel throttle speed curve according to the received actual state LPG fuel signal (the second fuel signal), and at the same time, controls the throttle stepper motor 5 to make the engine of the three-fuel generator set reach the maximum speed as required, so as to fully exert the combustion capacity of the engine. In other embodiments, a dual-fuel generator set can be provided, and after the generator set determines the fuel type, different throttle speed curves for two fuels are preset in the frequency converter 4, so that under the selection of different fuels, the engine can better exert its own performance according to the throttle speed curve set by the frequency conversion, i.e. the multi-fuel generator set can make the engine reach the maximum rated speed when different fuels are used.

[0016] In this embodiment, as shown, Figure 2 the throttle speed curve at least includes fuel throttle speed curve and gas speed curve. Taking an 8kW generator as an example, when using GAS fuel, the frequency converter 4 controls the speed at 3600r / min when the generator outputs 8kw power; when switching to NG fuel, the frequency converter 4 controls the speed at 3600r / min when the generator outputs 6.4kw power, fully exerting the designed performance of the engine.

[0017] Finally, it should be explained that the above embodiments are only used to illustrate the technical solutions of the utility model and not to limit, although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the utility model, and all of them should be covered in the claim scope of the utility model.

Claims

1. A multi-fuel generator set, characterized by: The utility model relates to a multi-fuel generator set, comprising a fuel selection switch for outputting a target selection signal of corresponding fuel; a controller for receiving the target selection signal outputted by the fuel selection switch and controlling the fuel switching of the electromagnetic valve of corresponding fuel based on the selection signal while outputting a first fuel signal; an instrument for receiving the first fuel signal outputted by the controller while outputting a second fuel signal; a frequency converter for receiving the second fuel signal outputted by the instrument, and the frequency converter is preset with at least two throttle speed curves, and based on the second fuel signal, the throttle speed curve corresponding to the target selection signal is selected and obtained, and the speed of the engine is controlled according to the corresponding throttle speed curve.

2. The multi-fuel generator set of claim 1, wherein, The throttle speed curve at least contains a fuel throttle speed curve and a gas throttle speed curve.

3. The multi-fuel generator set of claim 1, wherein, The instrument displays the fuel state corresponding to the second fuel signal.

4. The multi-fuel generator set of claim 1, wherein, The utility model further comprises a throttle step motor, and the frequency converter selects and obtains the throttle speed curve corresponding to the target selection signal based on the second fuel signal to control the throttle opening degree of the throttle step motor to control the engine speed of the multi-fuel generator set.

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