Multi-fuel generator set control system, control method thereof and generator set

Abstract

The invention discloses a multi-fuel generator set control system, a multi-fuel generator set control method and a generator set, which are applied to the technical field of generator sets. 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. A gas fuel supply pipeline of the multi-fuel engine is connected with a gas inlet of the gas supply electric control valve, and a gas outlet of the gas supply electric control valve is connected with a gas fuel inlet of the carburetor. And the signal input end of the fuel type detection circuit is connected with the fuel change-over switch. And the signal output ends of the oxygen sensors are respectively connected with the signal input end of the control device. The oxygen sensor is used for detecting an oxygen content signal, and the oxygen content signal is used for adjusting the air-fuel ratio. Closed-loop control over the air-fuel ratio can be achieved through oxygen content signals collected by the oxygen sensor so as to adapt to different air oxygen contents caused by different environmental parameters.

Description

Technical Field

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

[0002] Currently, most gas generator sets on the market adjust the air-fuel ratio using diaphragm springs and the size of the air intake. Traditional gas engines, however, have an air-fuel ratio that is not adjustable after factory calibration. When the user's operating environment differs from the calibrated parameters (altitude, temperature, humidity, etc.), it can lead to abnormal combustion, and even engine malfunctions such as stalling. This makes them unsuitable for high-altitude and frigid environments.

[0003] It is evident that how to enable engines to adapt to various environments and prevent abnormal combustion is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a multi-fuel generator set control system and control method and generator set, which solves the technical problem of abnormal engine combustion in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides a multi-fuel generator set control system. The multi-fuel generator set includes a multi-fuel engine and a generator driven and connected to the multi-fuel engine. The control system is characterized by including: 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, 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, and the carburetor, the gas supply electronic control valve, the signal detection module and the ignition device are respectively connected 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; 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 signal detection module includes an engine start signal detection circuit, a fuel type detection circuit, a speed sensor, a power detection circuit, and an oxygen sensor. The signal output terminals of the engine start signal detection circuit, the fuel type detection circuit, the speed sensor, the power detection circuit, and the oxygen sensor are respectively connected to the signal input terminal 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 detects the state of the engine start switch and outputs an engine start signal when the engine start switch is in the open state; the fuel type detection circuit detects the state of the fuel switching switch and outputs a corresponding fuel type signal; the speed sensor detects the speed signal of the fuel engine; the power detection circuit detects the current signal of the main winding of the generator and converts the current signal into a power generation signal; and the oxygen sensor detects the oxygen content signal in the exhaust gas of the fuel engine, and the oxygen content signal is used to adjust the air-fuel ratio.

[0006] Optionally, the control device is integrated into the inverter controller of the multi-fuel generator set.

[0007] Optionally, the signal detection module is used to detect the status signals of the fuel switching switch and the engine start switch, and send the detected operating status signals to the control device.

[0008] Optionally, the gas supply electronic control valve is a high-speed solenoid valve.

[0009] The present invention also provides a control method for a multi-fuel generator set control system, comprising: The operating status signals of the multi-fuel engine are detected by the signal detection module and sent to the control device; wherein, the operating status signals include at least the engine start signal, fuel type signal, engine speed signal, power generation signal, and oxygen content signal; The control device controls 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; wherein, the control device controls the throttle opening to adjust the air-fuel ratio according to the oxygen content signal.

[0010] Optionally, adjusting the air-fuel ratio by controlling the throttle opening based on the oxygen content signal includes: The output voltage signal is determined based on the oxygen content signal; The voltage signal is compared with the ideal voltage value, and a correction coefficient is determined based on the comparison result. The opening time of the gas supply electronic control valve is controlled based on the correction coefficient.

[0011] Optionally, the correction factor is a factor obtained based on the comparison difference and the base injection quantity.

[0012] Optionally, adjusting the air-fuel ratio by controlling the throttle opening based on the oxygen content signal includes: The throttle opening is controlled based on the oxygen content signal to adjust the air-fuel ratio to the theoretically optimal air-fuel ratio.

[0013] Optionally, the control device controls 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, including: When the fuel type signal indicates that the currently selected engine fuel is gaseous fuel, the engine control parameter database searches for the corresponding jet pulse width calibration table and ignition advance angle calibration table in the preset engine control parameter database. The engine control parameter database stores multiple jet pulse width calibration tables and ignition advance angle calibration tables for different fuel types. Each jet pulse width calibration table is set with jet pulse widths corresponding to different engine speeds and power generation, and each ignition advance angle calibration table is set with ignition advance angles corresponding to different engine speeds and power generation. Based on the engine speed signal and the generator power signal, the jet pulse width that matches the engine speed signal and the generator power signal is searched in the found jet pulse width calibration table. Based on the engine speed signal and the generator power signal, the ignition advance angle that matches the engine speed signal and the generator power signal is searched in the found ignition advance angle calibration table. Based on the jet pulse width obtained from the search, a corresponding PWM control signal is generated; based on the ignition advance angle obtained from the search, a corresponding ignition control signal is generated. The PWM control signal controls the switching state of the gas supply electronic control valve, and the ignition timing of the ignition device is controlled based on the ignition control signal. The throttle opening is controlled based on the oxygen content signal, and a throttle opening signal is generated using the throttle opening. The throttle opening signal is then used to control the throttle opening of the carburetor.

[0014] The present invention also provides a generator set, the generator set including the above-described multi-fuel generator set control system.

[0015] As can be seen, the multi-fuel generator set of the present invention includes a multi-fuel engine and a generator driven and connected to the multi-fuel engine. The control system comprises: 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 pipeline of the multi-fuel engine is connected to the inlet of the gas supply electronic control valve, 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, and the carburetor, the gas supply electronic control valve, the signal detection module, and the ignition device are respectively connected 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; wherein, 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 signal detection module includes an engine start signal detection circuit, a fuel type detection circuit, a speed sensor, a power detection circuit, and an oxygen sensor. The signal output terminals of the engine start signal detection circuit, the fuel type detection circuit, the speed sensor, the power detection circuit, and the oxygen sensor are respectively connected to the signal input terminal 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. Specifically, the engine start signal detection circuit detects the state of the engine start switch and outputs an engine start signal when the engine start switch is in the open state; the fuel type detection circuit detects the state of the fuel switching switch and outputs a corresponding fuel type signal; the speed sensor detects the speed signal of the fuel engine; the power detection circuit detects the current signal of the main winding of the generator and converts the current signal into a power generation signal; and the oxygen sensor detects the oxygen content signal in the exhaust gas of the fuel engine, and the oxygen content signal is used to adjust the air-fuel ratio. Compared with the current non-adjustable air-fuel ratio, this invention can achieve closed-loop control of the air-fuel ratio through the oxygen content signal collected by the oxygen sensor to adapt to different air oxygen contents caused by different environmental parameters.

[0016] In addition, the present invention also provides a multi-fuel generator set control method and a generator set, which also have the above-mentioned beneficial effects. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 A circuit block diagram of a multi-fuel generator set control system provided in an embodiment of the present invention; Figure 2 This invention provides a control method for a multi-fuel generator set control system. Figure 3 This is a schematic diagram of the control device of a multi-fuel generator set control system provided in an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please refer to Figure 1 , Figure 1 This is a circuit block diagram of a multi-fuel generator set control system provided in an embodiment of the present invention. It may include: 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, 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. 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. 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 operating status signal. The 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. 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 engine start signal detection circuit 51, the fuel type detection circuit 52, the speed sensor 53, the power detection circuit 54, and the oxygen sensor 56 are 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. 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; the fuel type detection circuit 52 is used to detect the state of the fuel switching switch 1 and output the corresponding fuel type signal; the speed sensor 53 is used to detect the speed signal of the fuel engine; 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; the oxygen sensor 56 is used to detect the oxygen content signal in the exhaust gas of the fuel engine, and the oxygen content signal is used to adjust the air-fuel ratio.

[0021] The working principle of the multi-fuel generator set control system in this embodiment is as follows: 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; and uses an oxygen sensor to detect the oxygen content in the engine exhaust gas, transmits the voltage signal to the control unit, the control unit calculates the correction coefficient by comparing the input voltage with the preset voltage, and outputs the correction coefficient to the solenoid valve actuator to adjust the engine concentration. The control device controls the throttle opening according to the oxygen content signal to adjust the air-fuel ratio, thereby achieving the purpose of closed-loop control of air-fuel ratio.

[0022] 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 based on 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, effectively avoiding the problem of inconsistent intake volume of gaseous fuel at the same speed. This can effectively improve the engine starting performance and working stability of the multi-fuel generator set when using gaseous fuel. Moreover, compared with the current non-adjustable air-fuel ratio, this application can realize closed-loop control of the air-fuel ratio through the oxygen content signal collected by the oxygen sensor to adapt to the different air oxygen content caused by different environmental parameters.

[0023] Furthermore, based on any of the above embodiments, the control device 7 is integrated into the inverter controller of the multi-fuel generator set. In the multi-fuel generator set, the inverter controller, as the main control component of the generator set, controls the operating 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.

[0024] Furthermore, based on any of the above embodiments, the signal detection module is used to detect the status signals of the fuel switching switch and the engine start switch, and send the detected operating status signals to the control device. Specifically, it detects the fuel type signal and engine start signal of the fuel switching switch and the engine start switch, and also detects engine operating status signals such as engine speed and generator power, sending the detected operating status signals to the control device. The control device then controls the on / off state of the gas supply electronic control valve and the ignition timing of the ignition device based on the received operating status signals, thereby achieving active control of the engine gas supply and precise control of the engine ignition timing.

[0025] Furthermore, based on any of the above embodiments, the signal detection module may further include a temperature sensor 55, the signal output terminal of which is connected to the signal input terminal of the control device 7. The temperature sensor 55 is used to detect the cylinder temperature signal of the fuel engine, so as to compensate for the amount of gaseous fuel injected based on the cylinder temperature signal of the engine.

[0026] This invention also provides a generator set, which includes the multi-fuel generator set control system described in any of the above embodiments.

[0027] 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 described above, 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 based on the real-time status of the engine, thereby effectively improving the engine starting performance and operational stability of the multi-fuel generator set when using gaseous fuel. Specifically, the generator set in this embodiment is a gas-liquid hybrid three-fuel generator set using LPG (liquefied petroleum gas), NG (natural gas), and gasoline as fuel.

[0028] For a clearer understanding of this invention, please refer to the following details. Figure 2 As shown, Figure 2 This invention provides a control method for a multi-fuel generator set control system, which may include the following steps: S101 detects the operating status signal of the multi-fuel engine through the signal detection module and sends it to the control device. The operating status signal includes at least the engine start signal, fuel type signal, engine speed signal, power generation signal, and oxygen content signal.

[0029] The execution subject of this embodiment is a multi-fuel generator set control system. Using the control method of this embodiment's multi-fuel generator set control system, when the multi-fuel generator set starts or operates normally, the signal detection module detects the status signals of the fuel switching switch and the engine start switch, i.e., the fuel type signal and the engine start signal. It also detects engine operating status signals such as engine speed signal, generator power signal, and cylinder block temperature signal, and sends the detected operating status signals to the control device.

[0030] S102, the control device controls the on / off state of the gas supply electronic control valve and the ignition timing of the ignition device according to the received working status signal; wherein, the control device controls the throttle opening to adjust the air-fuel ratio according to the oxygen content signal.

[0031] This embodiment achieves active control of the engine's fuel supply and precise control of the engine's ignition timing by controlling the on / off state of the fuel supply electronic control valve and the ignition timing of the ignition device based on received operating status signals. In this embodiment, the control device adjusts the air-fuel ratio by controlling the throttle opening based on oxygen content signals. This includes adjusting the air-fuel ratio by controlling the throttle opening based on detected oxygen content signals in the exhaust gas of the fuel engine, thereby improving engine efficiency and further achieving energy saving and emission reduction. This embodiment is not limited to the specific process of controlling the on / off state of the fuel supply electronic control valve and the ignition timing of the ignition device based on operating status signals. For example, this embodiment can start a multi-fuel generator set based on an engine start signal. This embodiment can search for the corresponding jet pulse width calibration table and ignition advance angle calibration table in the preset engine control parameter database based on the fuel type signal. It can also search for the jet pulse width matching the engine speed signal and power generation signal (or throttle opening) in the found jet pulse width calibration table, and the ignition advance angle matching the engine speed signal and power generation signal (or throttle opening) in the found ignition advance angle calibration table. 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 engine exhaust gas, improving engine efficiency and further achieving energy saving and emission reduction.

[0032] It should be further explained that, based on any of the above embodiments, the above-mentioned adjustment of the air-fuel ratio by controlling the throttle opening based on the oxygen content signal can include: determining the output voltage signal based on the oxygen content signal; comparing the voltage signal with the ideal voltage value, and determining a correction coefficient based on the comparison result; and controlling the opening time of the gas supply electronic control valve based on the correction coefficient. In this embodiment, the basic working principle of the oxygen sensor is that, after entering the working state, the output voltage signal switches between high and low according to the oxygen concentration (oxygen content signal), so that the air-fuel ratio is maintained at an ideal state. It can be understood that when the mixture is fully combusted, the voltage value is approximately 0.45V, and the voltage output by the oxygen sensor will jump around 0.45V. When the mixture is rich, the voltage value is close to 1V, at which point the injection will be at 0.95 times the current injection pulse width. When the mixture is lean, the voltage value is close to 0V, at which point the injection will be at 1.05 times the current injection pulse width. This process is dynamic. The voltage output signal is also a waveform that continuously cycles between 1 and 0.

[0033] For easier understanding, please refer to Figure 3 , Figure 3 This invention provides a framework diagram for adjusting the air-fuel ratio based on the oxygen content signal from an oxygen sensor. As shown in the diagram, the oxygen sensor collects the oxygen content signal from the engine exhaust gas, generates a voltage signal based on this signal, compares the voltage signal with an ideal voltage value, determines a correction coefficient based on the comparison result, and then controls the opening time of the fuel supply electronic control valve based on the correction coefficient. This embodiment can determine the voltage signal based on the oxygen content signal. The correction coefficient in this embodiment is fixed; the correction coefficients for rich and lean mixtures are determined during calibration and can be fine-tuned according to product characteristics. For example, if the user is concerned about fuel consumption, the coefficients for rich and lean mixtures will be adjusted to 0.9 and 1.05, respectively, so that the overall mixture concentration is on the leaner side of the theoretical air-fuel ratio. If the user is not particularly concerned about the product's fuel consumption, from a product development perspective, the correction coefficients will be adjusted to 0.95 and 1.1 (if the mixture is too lean, the combustion temperature is higher, and the engine's thermal load is greater).

[0034] It should be further explained that, based on any of the above embodiments, the correction coefficient is a coefficient obtained based on the comparison difference and the base injection quantity. In this embodiment, the correction coefficient is the base injection quantity multiplied by a factor. For example, if the injection pulse width is calculated to be 27.135ms from the table, and the oxygen sensor signal is detected as 0V, then it is determined that the air-fuel mixture is too lean, and the injection pulse width is adjusted to 27.135 × 1.05 = 28.492. Subsequently, if the oxygen sensor signal is detected as 1V, then it is determined that the air-fuel mixture is too rich, and the injection pulse width is adjusted again to 28.492 × 0.95 = 27.067. The oxygen sensor voltage signal is only 0V.

[0035] Three voltage signals: 0.45V and 1V.

[0036] It should be further explained that, based on any of the above embodiments, adjusting the air-fuel ratio by controlling the throttle opening according to the oxygen content signal can include: adjusting the air-fuel ratio to the theoretical optimal air-fuel ratio by controlling the throttle opening according to the oxygen content signal. In this embodiment, the theoretical optimal air-fuel ratio is 14.7:1, which may vary slightly depending on the calibration strategy. The optimal power air-fuel ratio range is (12:1 to 13.1:1), and the optimal economic air-fuel ratio range is (15:5 to 16.5:1). Typically, combustion occurs within the theoretical optimal air-fuel ratio range when the engine speed and load are stable. For generator sets, the engine speed only fluctuates during loading and unloading. In these cases, enrichment is required to ensure normal engine operation.

[0037] It should be further noted that, based on any of the above embodiments, the control device controlling 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 may include: S1021, when the fuel type signal indicates that the currently selected engine fuel is gaseous fuel, the engine control parameter database searches for the jet pulse width calibration table and ignition advance angle calibration table corresponding to the fuel type signal according to the fuel type signal. The engine control parameter database stores multiple jet pulse width calibration tables and ignition advance angle calibration tables for different fuel types. Each jet pulse width calibration table is set with jet pulse width corresponding to different engine speeds and power generation, and each ignition advance angle calibration table is set with ignition advance angle corresponding to different engine speeds and power generation. In this embodiment, the jet pulse width calibration table and ignition advance angle calibration table can be calibrated experimentally before the generator set leaves the factory and stored in the engine control parameter database in the engine control unit. In the engine control parameter database, for each gaseous fuel used by the generator set, there is one jet pulse width calibration table and one ignition advance angle calibration table. The first row of the jet pulse width calibration table represents the engine speed (in r / min), the first column represents the generator set's power output (in W), and the remaining cells represent the jet pulse width (in ms) corresponding to each speed and power (i.e., the pulse width of the PWM signal output by the control device to control the gas supply electronic control valve). The first row of the ignition advance angle calibration table represents the engine speed, the first column represents the generator set's power output, and the remaining cells represent the ignition advance angle (in °) of the ignition device corresponding to each speed and power. Furthermore, by setting up a corresponding jet pulse width calibration table and ignition advance angle calibration table for each type of gaseous fuel, the engine control parameters for various gaseous fuels have significant independence. In subsequent use or for different engine products, when it is necessary to add engine control parameters for different fuels, the cost increase involved in adding separate jet pulse width calibration tables and ignition advance angle calibration tables is relatively small. In addition, when upgrading the control program during engine start-up and operation by modifying the control parameters in the corresponding jet pulse width calibration tables and ignition advance angle calibration tables, each jet pulse width calibration table and ignition advance angle calibration table can be optimized separately without affecting the normal use of other jet pulse width calibration tables and ignition advance angle calibration tables.

[0038] S1022: Based on the engine speed signal and the generator power signal, search the obtained jet pulse width calibration table for a jet pulse width that matches the engine speed signal and the generator power signal. Based on the engine speed signal and the generator power signal, search the obtained ignition advance angle calibration table for an ignition advance angle that matches the engine speed signal and the generator power signal.

[0039] S1023 generates a corresponding PWM control signal based on the found jet pulse width and a corresponding ignition control signal based on the found ignition advance angle.

[0040] In this embodiment, the duty cycle of the PWM signal can be calculated using the jet pulse width, and the ignition timing of the ignition device can be calculated using the ignition advance angle. Therefore, after finding the jet pulse width and ignition advance angle corresponding to the current fuel, current speed, and current power generation, a corresponding PWM control signal can be generated based on the found jet pulse width, and a corresponding ignition control signal can be generated based on the found ignition advance angle.

[0041] S1024 controls the on / off state of the gas supply electronic control valve based on the PWM control signal, and controls the ignition timing of the ignition device based on the ignition control signal.

[0042] This embodiment can control the on / off state of the gas supply electronic control valve according to the generated PWM control signal, thereby controlling the intake amount of gaseous fuel. It can also control the ignition timing of the ignition device according to the generated ignition control signal, thereby accurately controlling the ignition timing. The combination of the two can effectively ensure that the engine operates under the best conditions.

[0043] S1025 controls the throttle opening based on the oxygen content signal, generates a throttle opening signal using the throttle opening, and controls the carburetor throttle opening based on the throttle opening signal.

[0044] In this embodiment, the optimal operating parameters of the engine are matched by looking up a table, which simplifies the internal operation process of the program when the engine starts and during engine operation, and improves the matching efficiency and accuracy between the engine's current operating status parameters and the engine's control parameters.

[0045] The present invention implements all or part of the control methods in the multi-fuel generator set control system of the above embodiments. This can be accomplished by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0046] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0047] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0048] Finally, it should be noted that in this document, relationships such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] The above provides a detailed description of a multi-fuel generator set control system, its control method, and the generator set provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

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, 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, and the carburetor, the gas supply electronic control valve, the signal detection module and the ignition device are respectively connected 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; 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 signal detection module includes an engine start signal detection circuit, a fuel type detection circuit, a speed sensor, a power detection circuit, and an oxygen sensor. The signal output terminals of the engine start signal detection circuit, the fuel type detection circuit, the speed sensor, the power detection circuit, and the oxygen sensor are respectively connected to the signal input terminal 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 detects the state of the engine start switch and outputs an engine start signal when the engine start switch is in the open state; the fuel type detection circuit detects the state of the fuel switching switch and outputs a corresponding fuel type signal; the speed sensor detects the speed signal of the fuel engine; the power detection circuit detects the current signal of the main winding of the generator and converts the current signal into a power generation signal; and the oxygen sensor detects the oxygen content signal in the exhaust gas of the fuel engine, and the oxygen content signal is used to adjust the air-fuel ratio.

2. The multi-fuel generator set control system according to claim 1, characterized in that, The control device is integrated into the inverter controller of the multi-fuel generator set.

3. The multi-fuel generator set control system according to claim 1, characterized in that, The signal detection module is used to detect the status signals of the fuel switching switch and the engine start switch, and sends the detected operating status signals to the control device.

4. 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.

5. A control method for a multi-fuel generator set control system according to any one of claims 1 to 4, characterized in that, include: The operating status signals of the multi-fuel engine are detected by the signal detection module and sent to the control device; wherein, the operating status signals include at least the engine start signal, fuel type signal, engine speed signal, power generation signal, and oxygen content signal; The control device controls 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; wherein, the control device controls the throttle opening to adjust the air-fuel ratio according to the oxygen content signal.

6. The control method for the multi-fuel generator set control system according to claim 5, characterized in that, Adjusting the air-fuel ratio by controlling the throttle opening based on the oxygen content signal includes: The output voltage signal is determined based on the oxygen content signal; The voltage signal is compared with the ideal voltage value, and a correction coefficient is determined based on the comparison result. The opening time of the gas supply electronic control valve is controlled based on the correction coefficient.

7. The control method for the multi-fuel generator set control system according to claim 6, characterized in that, The correction factor is a factor obtained based on the comparison difference and the base injection quantity.

8. The control method for the multi-fuel generator set control system according to claim 5, characterized in that, Adjusting the air-fuel ratio by controlling the throttle opening based on the oxygen content signal includes: The throttle opening is controlled based on the oxygen content signal to adjust the air-fuel ratio to the theoretically optimal air-fuel ratio.

9. The control method for the multi-fuel generator set control system according to claim 5, characterized in that, The control device controls 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, including: When the fuel type signal indicates that the currently selected engine fuel is gaseous fuel, the engine control parameter database searches for the corresponding jet pulse width calibration table and ignition advance angle calibration table in the preset engine control parameter database. The engine control parameter database stores multiple jet pulse width calibration tables and ignition advance angle calibration tables for different fuel types. Each jet pulse width calibration table is set with jet pulse widths corresponding to different engine speeds and power generation, and each ignition advance angle calibration table is set with ignition advance angles corresponding to different engine speeds and power generation. Based on the engine speed signal and the generator power signal, the jet pulse width that matches the engine speed signal and the generator power signal is searched in the found jet pulse width calibration table. Based on the engine speed signal and the generator power signal, the ignition advance angle that matches the engine speed signal and the generator power signal is searched in the found ignition advance angle calibration table. Based on the jet pulse width obtained from the search, a corresponding PWM control signal is generated; based on the ignition advance angle obtained from the search, a corresponding ignition control signal is generated. The PWM control signal controls the switching state of the gas supply electronic control valve, and the ignition timing of the ignition device is controlled based on the ignition control signal. The throttle opening is controlled based on the oxygen content signal, and a throttle opening signal is generated using the throttle opening. The throttle opening signal is then used to control the throttle opening of the carburetor.

10. A generator set, characterized in that, The generator set includes the multi-fuel generator set control system as described in any one of claims 1-4.

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