Multi-fuel generator set control system and generator set

Abstract

The utility model discloses a multi-fuel generator set control system and a generator set, the control system comprises a fuel change-over switch, an engine starting switch, a carburetor, a fuel gas supply electric control valve, a signal detection module, an ignition device and a control device, the fuel change-over switch and the engine starting switch are respectively connected with the signal detection module; the carburetor, the fuel gas supply electric control valve, the signal detection module and the ignition device are connected with the control device. The signal detection module is used for detecting working state signals of the multi-fuel engine and sending the detected working state signals to the control device. And the control device is used for controlling the on-off state of the fuel gas supply electric control valve and the ignition time of the ignition device according to the received working state signal. According to the multi-fuel generator set, the engine starting performance and the working stability of the multi-fuel generator set can be effectively improved when the multi-fuel generator set uses gas fuel.

Description

Technical Field

[0001] This utility model relates to the field of generator set technology, and in particular to a multi-fuel generator set control system and generator set. Background Technology

[0002] Multifuel generator sets consist of a multifuel engine and a generator, and are power generation devices that use a multifuel engine to drive a generator to achieve power output. Currently, multifuel generator sets are mainly divided into two types according to fuel type: one is a pure gas multifuel generator set, which uses at least two of the following gaseous fuels as engine fuels: LPG (liquefied petroleum gas), NG (natural gas), hydrogen, coal gas, biogas, etc.; the other is a gas-liquid hybrid multifuel generator set, which uses one or more gaseous fuels (such as LPG, NG, etc.) and one liquid fuel (such as gasoline, etc.) as engine fuel.

[0003] Multifuel generator sets typically have a fuel switching switch. Before engine start-up, this switch is used to switch the type of fuel supplied to the carburetor. During engine operation, only one fuel is selected. Existing multifuel generators have a diaphragm-type pressure reducing valve installed between the gaseous fuel supply line and the carburetor's gaseous fuel inlet. When gaseous fuel is selected, a negative pressure is generated in the engine cylinder during the engine intake stroke. This negative pressure causes the diaphragm-type pressure reducing valve to open, allowing gaseous fuel from the gaseous fuel supply line to enter the carburetor through the diaphragm-type pressure reducing valve, thus ensuring gaseous fuel supply during engine start-up and operation.

[0004] This method of passively opening the diaphragm pressure reducing valve to allow gaseous fuel to enter the engine through negative pressure requires extremely high precision in the fit between the engine and mechanical parts such as the diaphragm pressure reducing valve. Minor differences between parts (such as differences in the sealing of the engine cylinder block, differences in the spring elasticity of the diaphragm pressure reducing valve, etc.) may lead to inconsistencies in the amount of gaseous fuel entering the engine at the same speed, which in turn affects the consistency and stability of the amount of gas entering the engine cylinder block from the carburetor. This makes it difficult to guarantee stable combustion and power generation efficiency, resulting in poor working stability of multi-fuel generator sets.

[0005] When starting an engine with gaseous fuel, this method of passively opening a diaphragm pressure reducing valve to allow gaseous fuel into the engine via negative pressure requires passive fuel injection. During startup, the starter motor rotates, simultaneously controlling the throttle valve to create negative pressure within the carburetor. This causes the diaphragm pressure reducing valve to open, allowing the gaseous fuel supply system to deliver fuel to the carburetor. However, the degree of opening of the diaphragm pressure reducing valve is related to the carburetor negative pressure. Only when the engine reaches a certain speed can the carburetor generate the negative pressure necessary to open the diaphragm pressure reducing valve and allow the gaseous fuel supply system to deliver fuel to the carburetor. Due to the limited starter motor start-up time, the diaphragm pressure reducing valve opens for a short time and to a small degree each time the starter motor operates. This results in less gaseous fuel entering the carburetor with each start. Therefore, this passive fuel injection method typically requires opening and closing the throttle and intermittently starting the starter motor 3 to 6 times to successfully start the generator set, leading to starting difficulties and cumbersome operation.

[0006] Therefore, improving the engine starting performance and operational stability of multi-fuel generator sets when using gaseous fuels is an urgent problem to be solved. Utility Model Content

[0007] This utility model aims to solve at least one of the technical problems existing in the prior art, and innovatively proposes a multi-fuel generator set control system and generator set to improve the engine starting performance and working stability of multi-fuel generator sets when using gaseous fuel.

[0008] To achieve the aforementioned objectives of this utility model, according to a first aspect, this utility model provides a multi-fuel generator set control system, the multi-fuel generator set comprising a multi-fuel engine and a generator driven and connected to the multi-fuel engine.

[0009] The control system includes a fuel switching switch, an engine start switch, a carburetor, a gas supply electronic control valve, a signal detection module, an ignition device, and a control device. The gas fuel supply line of the multi-fuel engine is connected to the inlet of the gas supply electronic control valve, and the outlet of the gas supply electronic control valve is connected to the gas fuel inlet of the carburetor. The fuel switching switch and the engine start switch are respectively connected to the signal detection module. The carburetor, the gas supply electronic control valve, the signal detection module, and the ignition device are respectively connected to the control device.

[0010] The signal detection module is used to detect the operating status signal of the multi-fuel engine and send the detected operating status signal to the control device;

[0011] The control device is used to control the on / off state of the gas supply electronic control valve and the ignition timing of the ignition device according to the received operating status signal.

[0012] Preferably, the signal detection module includes an engine start signal detection circuit, a fuel type detection circuit, a speed sensor, and a power detection circuit. The signal output terminals of the engine start signal detection circuit, fuel type detection circuit, speed sensor, and power detection circuit are respectively connected to the signal input terminals of the control device. The signal input terminal of the engine start signal detection circuit is connected to the engine start switch, and the signal input terminal of the fuel type detection circuit is connected to the fuel switching switch.

[0013] The engine start signal detection circuit is used to detect the state of the engine start switch and output an engine start signal when the engine start switch is in the open state.

[0014] The fuel type detection circuit is used to detect the state of the fuel switching switch and output the corresponding fuel type signal;

[0015] The speed sensor is used to detect the speed signal of the fuel engine;

[0016] The power detection circuit is used to detect the current signal of the main winding of the generator and convert the current signal into a power generation signal.

[0017] Preferably, the signal detection module further includes a temperature sensor, the signal output terminal of which is connected to the signal input terminal of the control device, and the temperature sensor is used to detect the cylinder temperature signal of the fuel engine.

[0018] Preferably, the signal detection module further includes an oxygen sensor, the signal output terminal of which is connected to the signal input terminal of the control device, and the oxygen sensor is used to detect the oxygen content signal in the exhaust gas of the fuel engine.

[0019] Preferably, the gas supply electronic control valve is a high-speed solenoid valve.

[0020] Preferably, the ignition device includes an igniter and an ignition coil, wherein the signal input terminal of the igniter is connected to the signal output terminal of the control device, and the signal output terminal of the igniter is connected to the signal input terminal of the ignition coil.

[0021] Preferably, the control device is integrated into the inverter controller of the multi-fuel generator set.

[0022] According to a second aspect of the present invention, the present invention provides a generator set, the generator set including any of the above-described multi-fuel generator set control systems.

[0023] As can be seen from the above solutions, this utility model provides a multi-fuel generator set control system and generator set. By setting a gas supply electronic control valve to replace the pressure reducing valve, the connection between the gas fuel supply pipeline and the carburetor is controlled. A signal detection module is set to detect the working status signal of the multi-fuel engine. The control device controls the opening and closing status of the gas supply electronic control valve and the ignition timing of the ignition device according to the received working status signal. This realizes the active control of the gas fuel supply and engine ignition according to the real-time status of the engine, which can effectively improve the engine starting performance and working stability of the multi-fuel generator set when using gas fuel.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a circuit block diagram of a multi-fuel generator set control system in a preferred embodiment of this utility model. Detailed Implementation

[0027] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0028] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art and should not be interpreted in an idealized or overly formal sense unless specifically defined.

[0029] like Figure 1 As shown, this utility model embodiment provides a multi-fuel generator set control system.

[0030] Specifically, in this embodiment, the multi-fuel generator set includes a multi-fuel engine and a generator connected to the multi-fuel engine. The control system includes a fuel switching switch 1, an engine start switch 2, a carburetor 3, a gas supply electronic control valve 4, a signal detection module 5, an ignition device 6, and a control device 7. The gas fuel supply pipeline of the multi-fuel engine is connected to the inlet of the gas supply electronic control valve 4, and the outlet of the gas supply electronic control valve 4 is connected to the gas fuel inlet of the carburetor 3. The fuel switching switch 1 and the engine start switch 2 are respectively connected to the signal detection module 5, and the carburetor 3, the gas supply electronic control valve 4, the signal detection module 5, and the ignition device 6 are respectively connected to the control device 7.

[0031] Signal detection module 5 is used to detect the operating status signal of the multi-fuel engine and send the detected operating status signal to the control device 7;

[0032] The control device 7 is used to control the on / off state of the gas supply electronic control valve 4 and the ignition timing of the ignition device 6 according to the received working status signal.

[0033] The working principle of the multi-fuel generator set control system in this embodiment is as follows:

[0034] When the multi-fuel generator set starts or operates normally, the signal detection module 5 is used to detect the status signals of the fuel switching switch 1 and the engine start switch 2, thereby realizing the detection of engine operating status signals such as fuel type signal and engine start signal of the multi-fuel engine, and sending the detected operating status signals to the control device 7. The control device 7 controls the on / off state of the gas supply electronic control valve 4 and the ignition timing of the ignition device 6 according to the received operating status signals, thereby realizing active control of engine gas supply and precise control of engine ignition timing.

[0035] The multi-fuel generator set control system of this embodiment can actively control the supply of gaseous fuel and precisely control the ignition timing of the engine according to the real-time status of the engine. When the engine starts, the intake volume of gaseous fuel is no longer determined by the engine negative pressure, which effectively avoids the problem of inconsistent intake volume of gaseous fuel at the same speed. It can effectively improve the engine starting performance and working stability of the multi-fuel generator set when using gaseous fuel, and achieve the effect of energy saving and emission reduction.

[0036] In one embodiment, the signal detection module 5 includes an engine start signal detection circuit 51, a fuel type detection circuit 52, a speed sensor 53, and a power detection circuit 54. The signal output terminals of the engine start signal detection circuit 51, fuel type detection circuit 52, speed sensor 53, and power detection circuit 54 are respectively connected to the signal input terminals of the control device 7. The signal input terminal of the engine start signal detection circuit 51 is connected to the engine start switch 2, and the signal input terminal of the fuel type detection circuit 52 is connected to the fuel switching switch 1.

[0037] The engine start signal detection circuit 51 is used to detect the state of the engine start switch 2 and output an engine start signal when the engine start switch 2 is in the open state.

[0038] Fuel type detection circuit 52 is used to detect the state of fuel switching switch 1 and output the corresponding fuel type signal;

[0039] The speed sensor 53 is used to detect the speed signal of the fuel engine;

[0040] The power detection circuit 54 is used to detect the current signal of the main winding of the generator and convert the current signal into a power generation signal.

[0041] Existing multi-fuel generator control systems only detect engine speed and control the ignition timing of the ignition device 6 based on engine speed. In this embodiment, the signal detection module 5 detects engine start signal, fuel type signal, speed signal, and power generation signal by setting up engine start signal detection circuit 51, fuel type detection circuit 52, speed sensor 53, and power detection circuit 54, respectively. This allows the control device 7 to output corresponding solenoid valve control signals and ignition control signals based on the engine start signal, fuel type signal, speed signal, and power generation signal to control the on / off state of the gas supply electronic control valve 4 and the ignition timing of the ignition device 6, respectively. Based on detecting engine speed, the load is identified by detecting power generation, thereby achieving ignition angle control at different speeds and loads. This allows the engine to operate at its optimal condition at each load point, effectively improving the working efficiency of the multi-fuel generator and achieving energy saving and emission reduction.

[0042] In one embodiment, the signal detection module 5 further includes a temperature sensor 55, the signal output terminal of which is connected to the signal input terminal of the control device 7, and the temperature sensor 55 is used to detect the cylinder temperature signal of the fuel engine.

[0043] In this embodiment, the signal detection module 5 detects the cylinder block temperature signal of the engine by setting a temperature sensor 55, so that the control device 7 can further adjust the amount of gas fuel injection and the throttle opening according to the cylinder block temperature of the engine, thereby improving the starting performance of the engine when it is cold.

[0044] In one embodiment, the signal detection module 5 further includes an oxygen sensor 56, the signal output terminal of which is connected to the signal input terminal of the control device 7, and the oxygen sensor 56 is used to detect the oxygen content signal in the exhaust gas of the fuel engine.

[0045] In this embodiment, the signal detection module 5 detects the oxygen content in the engine exhaust gas by setting an oxygen sensor 56. The control device 7 can calculate the carbon monoxide content in the exhaust gas based on this, thereby determining the combustion status of the fuel in the engine. The control device 7 can control the throttle opening to adjust the air-fuel ratio based on the detected oxygen content signal in the fuel engine exhaust gas, thereby improving the engine's working efficiency and further achieving energy saving and emission reduction.

[0046] In one embodiment, the gas supply electronic control valve 4 is a high-speed solenoid valve.

[0047] High-speed solenoid valves have extremely fast response times, capable of opening and closing within milliseconds. This rapid response characteristic enables high-frequency switching and precise flow control. The control device 7 can control the opening and closing time of the high-speed solenoid valve via a PWM signal, thereby more accurately controlling the timing and amount of gaseous fuel injection, improving engine combustion efficiency and power output.

[0048] In one embodiment, the ignition device 6 includes an igniter 61 and an ignition coil 62. The signal input terminal of the igniter 61 is connected to the signal output terminal of the control device 7, and the signal output terminal of the igniter 61 is connected to the signal input terminal of the ignition coil 62.

[0049] In this embodiment, the igniter 61 is responsible for controlling the working state of the ignition coil 62. It determines when to generate high voltage by controlling the on and off of the current, thereby controlling the ignition timing of the spark plug. The main function of the ignition coil 62 is to convert the low voltage provided by the power supply into a high voltage. This high voltage is guided to the spark plug to generate a spark to ignite the air and fuel mixture of the engine.

[0050] In one embodiment, the control device 7 is integrated into the inverter controller of the multi-fuel generator set.

[0051] In multi-fuel generator sets, the inverter controller is the main control component of the generator set, controlling the working status of the engine and the generator. In this embodiment, by integrating the control device 7 into the inverter controller of the multi-fuel generator set, centralized control is achieved while effectively reducing the wiring of the control system.

[0052] In some other embodiments, the control device 7 may also be an engine ECU or a separate control device (such as an MCU controller).

[0053] This utility model embodiment also provides a generator set, which includes the multi-fuel generator set control system of any of the above embodiments.

[0054] The working principle of the generator set in this embodiment is the same as that of the multi-fuel generator set control system in the above embodiments, and will not be repeated here. Since the generator set in this embodiment adopts the multi-fuel generator set control system in the above embodiments, it has the same beneficial effects as the multi-fuel generator set control system. It can also actively control the supply of gaseous fuel and the ignition of the engine according to the real-time status of the engine, thereby effectively improving the engine starting performance and the working stability of the multi-fuel generator set when using gaseous fuel.

[0055] Specifically, the generator set in this embodiment is a gas-liquid hybrid three-fuel generator set that uses LPG, NG and gasoline as fuels.

[0056] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A control system for a multi-fuel generator set, the multi-fuel generator set comprising a multi-fuel engine and a generator driven and connected to the multi-fuel engine, characterized in that, The control system includes a fuel switching switch, an engine start switch, a carburetor, a gas supply electronic control valve, a signal detection module, an ignition device, and a control device. The gas fuel supply line of the multi-fuel engine is connected to the inlet of the gas supply electronic control valve, and the outlet of the gas supply electronic control valve is connected to the gas fuel inlet of the carburetor. The fuel switching switch and the engine start switch are respectively connected to the signal detection module. The carburetor, the gas supply electronic control valve, the signal detection module, and the ignition device are respectively connected to the control device. The signal detection module is used to detect the operating status signal of the multi-fuel engine and send the detected operating status signal to the control device; The control device is used to control the on / off state of the gas supply electronic control valve and the ignition timing of the ignition device according to the received operating status signal.

2. The multi-fuel generator set control system according to claim 1, characterized in that, The signal detection module includes an engine start signal detection circuit, a fuel type detection circuit, a speed sensor, and a power detection circuit. The signal output terminals of these circuits are respectively connected to the signal input terminals of the control device. The signal input terminal of the engine start signal detection circuit is connected to the engine start switch, and the signal input terminal of the fuel type detection circuit is connected to the fuel switching switch. The engine start signal detection circuit is used to detect the state of the engine start switch and output an engine start signal when the engine start switch is in the open state. The fuel type detection circuit is used to detect the state of the fuel switching switch and output the corresponding fuel type signal; The speed sensor is used to detect the speed signal of the fuel engine; The power detection circuit is used to detect the current signal of the main winding of the generator and convert the current signal into a power generation signal.

3. The multi-fuel generator set control system according to claim 2, characterized in that, The signal detection module also includes a temperature sensor, the signal output terminal of which is connected to the signal input terminal of the control device, and the temperature sensor is used to detect the cylinder temperature signal of the fuel engine.

4. The multi-fuel generator set control system according to claim 2, characterized in that, The signal detection module also includes an oxygen sensor, the signal output terminal of which is connected to the signal input terminal of the control device. The oxygen sensor is used to detect the oxygen content signal in the exhaust gas of the fuel engine.

5. The multi-fuel generator set control system according to claim 1, characterized in that, The gas supply electronic control valve is a high-speed solenoid valve.

6. The multi-fuel generator set control system according to claim 1, characterized in that, The ignition device includes an igniter and an ignition coil. The signal input terminal of the igniter is connected to the signal output terminal of the control device, and the signal output terminal of the igniter is connected to the signal input terminal of the ignition coil.

7. The multi-fuel generator set control system according to any one of claims 1-6, characterized in that, The control device is integrated into the inverter controller of the multi-fuel generator set.

8. A generator set, characterized in that, The generator set includes the multi-fuel generator set control system as described in any one of claims 1-7.

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