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

Abstract

The invention discloses a multi-fuel generator set control system, a control method thereof and a generator set, which are applied to the technical field of generator sets, the multi-fuel generator set control system comprises a multi-fuel generator set and a control system, 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. The temperature sensor is used for detecting a cylinder body temperature signal of the fuel engine and compensating the injection amount of the gas fuel according to the cylinder body temperature signal of the engine. The temperature sensor is used for monitoring the temperature of the cylinder body of the engine in real time, the injection amount of the gas fuel is compensated according to the temperature of the cylinder body of the engine, and the combustion condition in the engine heating process of the engine is stabilized.

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 start their engines and then keep the choke closed. At this point, the air intake is very small, only enough to maintain idle speed, and there is no output. If an external load is applied, the engine immediately shuts off. The current solution is to start the engine in low-temperature environments, keep the choke closed for 30 to 60 seconds, then partially open the choke for about 30 seconds, and finally fully open the choke. Only then can the engine operate normally.

[0003] It is evident that current gas engines on the market are unstable during the warm-up process after starting in low-temperature environments. How to improve the stability of engine control 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 engine instability during the heat engine process 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 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 a temperature 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 temperature 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 temperature sensor detects the cylinder temperature signal of the fuel engine to compensate for the amount of gaseous fuel injected based on the cylinder temperature signal.

[0006] Optionally, 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.

[0007] The present invention also provides a control method for the above-mentioned multi-fuel generator set control system, characterized in that it includes: The operating status signals of the multi-fuel engine are detected by the signal detection module and sent to the control device. The operating status signals include at least the engine start signal, fuel type signal, engine speed signal, power generation signal, and cylinder temperature 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 compensates for the injection quantity of gaseous fuel according to the cylinder temperature signal.

[0008] 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 searches the preset engine control parameter database for the corresponding jet pulse width calibration table, ignition advance angle calibration table, and jet compensation calibration table. The engine control parameter database stores multiple jet pulse width calibration tables, ignition advance angle calibration tables, and jet compensation calibration tables for different fuel types. Each jet pulse width calibration table sets the jet pulse width corresponding to different engine speeds, each ignition advance angle calibration table sets the ignition advance angle corresponding to different engine speeds, and each jet compensation calibration table sets the jet pulse width compensation coefficient corresponding to different cylinder block temperature signals. Based on the engine speed signal, the jet pulse width calibration table is used to find the jet pulse width that matches the engine speed signal; based on the engine speed signal, the ignition advance angle calibration table is used to find the ignition advance angle that matches the engine speed signal. Based on the cylinder block temperature signal, the jet compensation calibration table is used to find the jet pulse width compensation coefficient that matches the cylinder block temperature signal. Based on the jet pulse width and the jet pulse width compensation coefficient, the temperature-compensated jet pulse width is obtained; Based on the temperature-compensated jet pulse width, a corresponding PWM control signal is generated; based on the ignition advance angle, 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 control signal controls the ignition timing of the ignition device.

[0009] Optionally, each jet pulse width calibration table is set with jet pulse widths corresponding to different engine speeds and throttle openings, each ignition advance angle calibration table is set with ignition advance angles corresponding to different engine speeds and throttle openings, and each jet compensation calibration table is set with jet pulse width compensation coefficients corresponding to different throttle openings and cylinder block temperatures. Accordingly, based on the engine speed signal, the jet pulse width calibration table is used to find the jet pulse width that matches the engine speed signal; based on the engine speed signal, the ignition advance angle calibration table is used to find the ignition advance angle that matches the engine speed signal; based on the cylinder block temperature signal, the jet compensation amount calibration table is used to find the jet pulse width compensation coefficient that matches the cylinder block temperature signal, including: Based on the engine speed signal and throttle opening, the jet pulse width calibration table is used to find the jet pulse width that matches the engine speed signal and throttle opening; based on the engine speed signal and throttle opening, the ignition advance angle calibration table is used to find the ignition advance angle that matches the engine speed signal and throttle opening; based on the cylinder block temperature signal and throttle opening, the jet pulse width compensation coefficient is used to find the jet pulse width compensation coefficient that matches the cylinder block temperature signal and throttle opening.

[0010] Optionally, each jet pulse width calibration table is set with jet pulse widths corresponding to different engine speeds and power generation, each ignition advance angle calibration table is set with ignition advance angles corresponding to different engine speeds and power generation, and each jet compensation calibration table is set with jet pulse width compensation coefficients corresponding to different power generation and cylinder block temperatures.

[0011] Optionally, based on the jet pulse width and the jet pulse width compensation coefficient, the temperature-compensated jet pulse width is obtained, including: Obtain preset rules; wherein, the preset rules are functions constructed based on the operational relationship between jet pulse width, jet pulse width compensation coefficient and set values; Based on the jet pulse width and the jet pulse width compensation coefficient, the temperature-compensated jet pulse width is obtained using the preset rule.

[0012] Optionally, when the fuel type signal indicates that the currently selected engine fuel is gaseous fuel, before searching the preset engine control parameter database for the corresponding jet pulse width calibration table, ignition advance angle calibration table, and jet compensation calibration table based on the fuel type signal, the following steps are also included: By adjusting the injection pulse width compensation coefficient to ensure the air-fuel ratio is normal at the current cylinder block temperature, the injection pulse width compensation coefficient corresponding to different throttle opening and cylinder block temperature information is determined through multiple tests.

[0013] Optionally, the gaseous fuel is LPG, NG, or hydrogen.

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

[0015] This invention also provides a control device for a multi-fuel generator set control system, comprising: The operating status signal transmission module is used to detect the operating status signal of the multi-fuel engine through the signal detection module and send 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 cylinder temperature signal. The injection quantity compensation module 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 working status signal through the control device; wherein, the control device compensates for the injection quantity of gaseous fuel according to the cylinder temperature signal.

[0016] As can be seen, the multi-fuel generator set control system provided by the present invention includes a multi-fuel generator set comprising a multi-fuel engine and a generator driven and connected to the multi-fuel engine. 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 pipeline 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 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 and a fuel type detection circuit. The system includes a circuit, a speed sensor, a power detection circuit, and a temperature 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 temperature sensor 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. 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 temperature sensor detects the cylinder temperature signal of the fuel engine to compensate for the amount of gaseous fuel injected based on the cylinder temperature signal.

[0017] The beneficial effects of this invention are as follows: Compared with the instability of current gas engines during the warm-up process after starting in low-temperature environments, this invention provides a multi-fuel generator set control system, its control method, and the generator set. It controls the connection between the gas fuel supply pipeline and the carburetor by replacing the pressure reducing valve with a gas supply electronic control valve, and includes a signal detection module to detect the operating status signal of the multi-fuel engine. A control device 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 signal. This achieves proactive control of the gas fuel supply and engine ignition based on the real-time engine status, effectively improving the engine starting performance and operating stability of the multi-fuel generator set when using gas fuel. Furthermore, by incorporating a temperature sensor, this application can further adjust the gas fuel injection quantity based on the engine cylinder temperature. Specifically, the temperature sensor monitors the engine temperature in real time (characterizing the engine's warm-up condition), and different compensation coefficients are preset at different temperatures to enrich the air-fuel mixture concentration during the cold start warm-up process, stabilizing the combustion during the engine warm-up process.

[0018] In addition, the present invention also provides a control method for a multi-fuel generator set control system and a generator set, which also have the above-mentioned beneficial effects. Attached Figure Description

[0019] 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.

[0020] Figure 1 A circuit block diagram of a multi-fuel generator set control system provided in an embodiment of the present invention; Figure 2 A flowchart of a control method for a multi-fuel generator set control system provided in an embodiment of the present invention; Figure 3 This is a flowchart illustrating a jet pulse width compensation method provided in an embodiment of the present invention. Detailed Implementation

[0021] 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.

[0022] 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 temperature sensor 55 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 temperature sensor 55 is used to detect the cylinder temperature signal of the fuel engine so as to compensate the amount of gaseous fuel injection based on the cylinder temperature signal of the engine.

[0023] 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.

[0024] 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.

[0025] Existing multi-fuel generator set 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 the engine start signal, fuel type signal, engine speed signal, generator power signal, and cylinder block temperature signal respectively by setting up an engine start signal detection circuit 51, a fuel type detection circuit 52, a speed sensor 53, a power detection circuit 54, and a temperature sensor 55. This allows the control device 7 to output corresponding solenoid valve control signals and ignition control signals based on these signals. The control unit controls the on / off state of the gas supply electronic control valve 4 and the ignition timing of the ignition device 6. Based on the detection of engine speed, it identifies the load by detecting the 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, achieving energy saving and emission reduction. After the engine starts successfully, the control unit detects the engine block temperature in real time and enriches the fuel (increasing the solenoid valve opening time) according to the preset temperature compensation coefficient (i.e., the injection pulse width compensation coefficient) to achieve enrichment (compensating for the amount of gaseous fuel injected) and stabilize combustion. In this embodiment, the signal detection module 5 detects the engine block temperature signal by setting a temperature sensor 55, so that the control device 7 can further adjust the amount of gaseous fuel injected and the throttle opening according to the engine block temperature, thereby improving the engine's cold start performance.

[0026] It should be further noted that, based on any of the above embodiments, the signal detection module 5 also includes an oxygen sensor 56. The signal output terminal of the oxygen sensor 56 is connected to the signal input terminal of the control device 7. The oxygen sensor 56 is used to detect the oxygen content signal in the exhaust gas of the fuel engine.

[0027] It should be further explained that, based on any of the above embodiments, the signal detection module 5 detects the oxygen content in the engine exhaust gas by setting the oxygen sensor 56. The control device 7 can calculate the carbon monoxide content in the exhaust gas accordingly, 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.

[0028] It should be further noted that, based on any of the above embodiments, the gas supply electronic control valve 4 is a high-speed solenoid valve. The high-speed solenoid valve has a very fast response time, capable of completing the valve opening and closing operation within milliseconds. This rapid response characteristic enables the high-speed solenoid valve to achieve high-frequency switching and precise flow control. The control device 7 can control the opening and closing time of the high-speed solenoid valve through a PWM signal, thereby more accurately controlling the timing and amount of gas fuel injection, improving engine combustion efficiency and power output.

[0029] It should be further explained that, based on any of the above embodiments, 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. 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 / off state 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-fuel mixture in the engine.

[0030] It should be further noted that, 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 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. It should also be noted that the control device 7 can also be the engine ECU (electronic control unit) or a separate control device.

[0031] This invention also provides a generator set, which includes the multi-fuel generator set control system described in any of the above embodiments.

[0032] 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.

[0033] Specifically, the generator set in this embodiment is a gas-liquid hybrid three-fuel generator set that uses LPG (liquefied petroleum gas), NG (natural gas) and gasoline as fuel.

[0034] For a clearer understanding of this invention, please refer to the following details. Figure 2 As shown in the figure, an embodiment of the present 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 cylinder temperature signal.

[0035] 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.

[0036] 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 compensates for the injection quantity of gaseous fuel according to the cylinder temperature signal.

[0037] 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. The process of controlling the fuel supply electronic control valve and the ignition timing based on received operating status signals includes the control device compensating for the gas injection quantity based on cylinder block temperature signals. This embodiment does not limit the specific process of controlling the fuel supply electronic control valve and the ignition timing 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 a preset engine control parameter database based on the fuel type signal; this embodiment can search for the jet pulse width that matches the engine speed signal and power generation signal in the found jet pulse width calibration table based on the engine speed signal and power generation signal, and search for the ignition advance angle that matches the engine speed signal and power generation signal in the found ignition advance angle calibration table based on the engine speed signal and power generation signal; this embodiment can search for the jet pulse width compensation coefficient that matches the power generation signal and cylinder block temperature signal in the found jet compensation amount calibration table based on the cylinder block temperature signal.

[0038] It should be further explained that, based on any of the above embodiments, controlling the on / off state of the gas supply electronic control valve and the ignition timing of the ignition device by the control device according to the received working 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 is searched for the corresponding jet pulse width calibration table, ignition advance angle calibration table, and jet compensation calibration table based on the fuel type signal. The engine control parameter database stores multiple jet pulse width calibration tables, ignition advance angle calibration tables, and jet compensation calibration tables for different fuel types. Each jet pulse width calibration table sets the jet pulse width corresponding to different engine speeds, each ignition advance angle calibration table sets the ignition advance angle corresponding to different engine speeds, and each jet compensation calibration table sets the jet pulse width compensation coefficient corresponding to different cylinder block temperature signals.

[0039] This embodiment does not limit the specific jet pulse width calibration table. For example, the jet pulse width calibration table in this embodiment can be a table representing the correspondence between different engine speeds and throttle openings and jet pulse widths; or the jet pulse width calibration table in this embodiment can be a table representing the jet pulse widths corresponding to different engine speeds and generator power. This embodiment does not limit the specific ignition advance angle calibration table. For example, the ignition advance angle calibration table in this embodiment can be a table representing the correspondence between different generator speeds and generator power and ignition advance angles; the ignition advance angle calibration table in this embodiment can also be a table representing the correspondence between different generator speeds and throttle openings and ignition advance angles. This embodiment does not limit the specific jet compensation amount calibration table. The jet compensation amount calibration table in this embodiment can be a table representing the correspondence between different cylinder block temperature signals and generator power and jet compensation amount; or the jet compensation amount calibration table in this embodiment can also be a table representing the correspondence between different cylinder block temperature signals and throttle openings and jet compensation amount.

[0040] S1022, based on the engine speed signal, use the jet pulse width calibration table to find the jet pulse width that matches the engine speed signal; based on the engine speed signal, use the ignition advance angle calibration table to find the ignition advance angle that matches the engine speed signal.

[0041] S1023, based on the cylinder block temperature signal, uses the jet compensation calibration table to find the jet pulse width compensation coefficient that matches the cylinder block temperature signal.

[0042] S1024, Based on the jet pulse width and the jet pulse width compensation coefficient, the temperature-compensated jet pulse width is obtained.

[0043] S1025 generates a corresponding PWM control signal based on the temperature-compensated jet pulse width and a corresponding ignition control signal based on the ignition advance angle.

[0044] S1026 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.

[0045] It should be further explained that, based on any of the above embodiments, each jet pulse width calibration table is set with jet pulse width corresponding to different engine speeds and throttle openings, each ignition advance angle calibration table is set with ignition advance angle corresponding to different engine speeds and throttle openings, and each jet compensation calibration table is set with jet pulse width compensation coefficient corresponding to different throttle openings and cylinder block temperatures. Accordingly, based on the engine speed signal, the jet pulse width calibration table is used to find the jet pulse width that matches the engine speed signal; based on the engine speed signal, the ignition advance angle calibration table is used to find the ignition advance angle that matches the engine speed signal; based on the cylinder block temperature signal, the jet compensation amount calibration table is used to find the jet pulse width compensation coefficient that matches the cylinder block temperature signal, which may include: Step 1: Based on the engine speed signal and throttle opening, use the jet pulse width calibration table to find the jet pulse width that matches the engine speed signal and throttle opening; Step 2: Based on the engine speed signal and throttle opening, use the ignition advance angle calibration table to find the ignition advance angle that matches the engine speed signal and throttle opening. Step 3: Based on the cylinder block temperature signal and throttle opening, use the jet compensation calibration table to find the jet pulse width compensation coefficient that matches the cylinder block temperature signal and throttle opening.

[0046] For ease of understanding, please refer to Table 1. Table 1 is a representation of the jet compensation calibration provided by an embodiment of the present invention. It can be understood that the throttle opening of each engine is 0-90°. The throttle opening is used to characterize the load size. The larger the throttle opening, the greater the engine load, so that the table can be universal.

[0047] Table 1. An Interpretation of Jet Compensation Calibration

[0048] It should be further explained that, because the optimal supply of gaseous fuel required for engine start-up and normal operation varies at different temperatures to achieve the best generator set operating efficiency, the optimal amount of gaseous fuel required for engine start-up and normal operation at the same power and speed also varies. When the power and speed are constant, the engine efficiency is lower when running cold. To ensure that the operating efficiency of the multi-fuel engine remains optimal at different temperatures, the control method provided in this embodiment may further include the following steps, please refer to [reference needed]. Figure 3 , Figure 3 A flowchart illustrating a jet pulse width compensation method provided in an embodiment of the present invention is shown below: S1, when the fuel type signal indicates that the currently selected engine fuel is gaseous fuel, the engine control parameter database is searched for the corresponding jet pulse width calibration table, ignition advance angle calibration table, and jet compensation calibration table based on the fuel type signal. The engine control parameter database stores multiple jet pulse width calibration tables, ignition advance angle calibration tables, and jet compensation 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. Each ignition advance angle calibration table is set with ignition advance angles corresponding to different engine speeds and power generation. Each jet compensation calibration table is set with jet pulse width compensation coefficients corresponding to different power generation and cylinder temperature signals.

[0049] In this embodiment, the liquid fuel supply method is consistent with that of a traditional carburetor, and this invention remains unchanged. This gas valve only controls the fuel gas. Different fuel types in this embodiment include LPG, NG, and hydrogen, with each fuel differing only in the value in the corresponding calibration table (this value needs to be determined by dynamometer calibration). The control method is the same for all fuels. It is understandable that the ignition advance angle is only related to engine speed and load. The ignition advance time relative to top dead center is fixed. The higher the engine speed, the faster the piston linear velocity, and the shorter the time required from ignition to top dead center. Therefore, generally, the faster the engine speed, the larger the ignition advance angle value. Typically, at low loads, there is more residual exhaust gas in the cylinder, resulting in slower combustion and requiring a larger ignition advance angle. At low loads, combustion is faster, and to reduce the risk of knocking, the ignition advance angle is usually reduced. The injection compensation amount is mainly related to the engine block temperature.

[0050] S2, based on the engine speed signal and the generator power signal, search the obtained jet pulse width calibration table to find the 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 to find the ignition advance angle that matches the engine speed signal and the generator power signal. For ease of understanding, please refer to Tables 2 and 3. Table 2 is a jet pulse width calibration table provided by an embodiment of the present invention, and Table 3 is an ignition advance angle calibration table provided by an embodiment of the present invention. In Table 2, when the engine speed is 2000 r / min and the power generation is 4500 W, the corresponding jet pulse width is 20.125 ms; in Table 3, when the engine speed is 2000 r / min and the power generation is 4500 W, the corresponding ignition advance angle is 22.00°.

[0051] Table 2. Schematic diagram of a jet pulse width calibration table.

[0052] Table 3 Ignition Advance Angle Calibration Table

[0053] S3, based on the generator power signal and cylinder block temperature signal, searches the obtained jet compensation calibration table for the jet pulse width compensation coefficient that matches the generator power signal and cylinder block temperature signal.

[0054] Please refer to Table 4, which is a jet compensation calibration table for an NG engine provided in an embodiment of the present invention. The data in the first row of this table represents the engine block temperature (in °C), the data in the first column represents the generator set's power output, and the data in the remaining cells represent the jet pulse width compensation coefficient corresponding to each temperature and power output. For example, in Table 4, when the engine block temperature is -20 °C and the generator output is 4500 W, the corresponding jet pulse width compensation coefficient is 11.00.

[0055] Table 4. Calibration table for jet compensation in an NG

[0056] When the fuel type signal indicates that the currently selected engine fuel is NG, the corresponding jet pulse width calibration table, ignition advance angle calibration table, and jet compensation amount calibration table are searched in the preset engine control parameter database according to the fuel type signal, which are Table 2, Table 3, and Table 4, respectively. It should be noted that, due to space limitations, the jet compensation calibration tables shown in Table 1, 2, 3, and 4 (NG) only display partial data, such as the jet pulse width and ignition advance angle data corresponding to engine speed and generator power. In practical applications, the data points for engine speed and generator power can be more densely packed. For example, one data point can be set for engine speed every 100 r / min, and one data point for generator power every 100 W. When there is a deviation between the actual measured engine speed and generator power data and the data points in the table, the data corresponding to the data point closest to the calibrated data point in the table is used. For example, when the measured engine speed is 2465 r / min and the generator power is 2123 W, the jet pulse width corresponding to an engine speed of 2500 r / min and a generator power of 2100 W is selected from the jet pulse width calibration table. It can be understood that the denser the data points, the more accurate the data obtained by looking up the table.

[0057] S4, the jet pulse width that matches the engine speed signal and the generator power signal is obtained by looking up the table, and the jet pulse width compensation coefficient that matches the generator power signal and the cylinder block temperature signal is obtained by looking up the table, and the temperature-compensated jet pulse width is obtained.

[0058] This embodiment can perform a preset rule calculation on the jet pulse width that matches the engine speed signal and the power generation signal obtained from the lookup table and the jet pulse width compensation coefficient that matches the power generation signal and the cylinder block temperature signal obtained from the lookup table (in this embodiment, the product of the jet pulse width and the jet pulse width compensation coefficient is divided by 10) to obtain the temperature-compensated jet pulse width.

[0059] S5 generates a corresponding PWM control signal based on the temperature-compensated jet pulse width obtained from the calculation, and generates a corresponding ignition control signal based on the ignition advance angle obtained from the lookup; the duty cycle of the PWM signal can be calculated through the temperature-compensated jet pulse width, and the ignition timing of the ignition device can be calculated through the ignition advance angle.

[0060] It is understandable that the duty cycle of the PWM signal can be calculated from the jet pulse width, and the ignition timing of the ignition device can be calculated from 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, the corresponding PWM control signal can be generated based on the found jet pulse width, and the corresponding ignition control signal can be generated based on the found ignition advance angle.

[0061] S6 controls the switching state of the gas supply electronic control valve based on the generated PWM control signal, and controls the ignition timing of the ignition device based on the generated ignition control signal.

[0062] This embodiment controls the on / off state of the gas supply electronic control valve based on the generated PWM control signal, thereby controlling the intake volume of gaseous fuel. It also controls the ignition timing of the ignition device based on the generated ignition control signal, thus precisely controlling the ignition timing. The combination of these two methods effectively ensures that the engine operates under optimal conditions. In this embodiment, the jet pulse width is ultimately reflected in the solenoid valve opening time, thereby accurately increasing the solenoid valve opening time to achieve enrichment and stable combustion.

[0063] It should be further explained that obtaining the temperature-compensated jet pulse width based on the jet pulse width and the jet pulse width compensation coefficient can include: acquiring a preset rule; wherein, the preset rule is a function constructed based on the operational relationship between the jet pulse width, the jet pulse width compensation coefficient, and a set value; and obtaining the temperature-compensated jet pulse width based on the jet pulse width and the jet pulse width compensation coefficient using the preset rule. This embodiment does not limit the specific preset rule. For example, the preset rule in this embodiment can be the product of the jet pulse width and the jet pulse width compensation coefficient divided by 10; or the preset rule in this embodiment can also be the product of the jet pulse width and the jet pulse width compensation coefficient divided by 11, etc.

[0064] It should be further explained that, based on any of the above embodiments, when the fuel type signal indicates that the currently selected engine fuel is gaseous fuel, before searching the preset engine control parameter database for the corresponding jet pulse width calibration table, ignition advance angle calibration table, and jet compensation calibration table according to the fuel type signal, the method may further include: adjusting the jet pulse width compensation coefficient to ensure the air-fuel ratio is normal at the current cylinder block temperature, and determining the jet pulse width compensation coefficient corresponding to different throttle opening and cylinder block temperature information through multiple experiments. This embodiment can construct the jet pulse width calibration table by repeatedly determining the jet pulse width compensation coefficient corresponding to the throttle opening and cylinder block temperature information, thereby improving the accuracy of the jet pulse width calibration table construction.

[0065] Understandably, by constructing tables and matching data through table lookups, the internal operation flow of the program during engine startup and operation becomes simpler, and the matching efficiency and accuracy between the engine's current operating parameters and its control parameters are higher. 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 minimal. Additionally, when upgrading the control program during engine startup 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 individually without affecting the normal use of other jet pulse width calibration tables and ignition advance angle calibration tables.

[0066] In summary, the beneficial effects of the embodiments of the present invention may include: 1. Users no longer need a series of cumbersome warm-up procedures, greatly improving the user experience; 2. By compensating for the jet concentration during the heat engine process, engine combustion is stabilized.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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 a temperature 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 temperature 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 temperature sensor detects the cylinder temperature signal of the fuel engine to compensate for the amount of gaseous fuel injected based on the cylinder temperature signal.

2. The multi-fuel generator set control system according to claim 1, 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.

3. A control method for a multi-fuel generator set control system according to any one of claims 1 to 2, 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. The operating status signals include at least the engine start signal, fuel type signal, engine speed signal, power generation signal, and cylinder temperature 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 compensates for the injection quantity of gaseous fuel according to the cylinder temperature signal.

4. The control method for the multi-fuel generator set control system according to claim 3, 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 searches the preset engine control parameter database for the corresponding jet pulse width calibration table, ignition advance angle calibration table, and jet compensation calibration table. The engine control parameter database stores multiple jet pulse width calibration tables, ignition advance angle calibration tables, and jet compensation calibration tables for different fuel types. Each jet pulse width calibration table sets the jet pulse width corresponding to different engine speeds, each ignition advance angle calibration table sets the ignition advance angle corresponding to different engine speeds, and each jet compensation calibration table sets the jet pulse width compensation coefficient corresponding to different cylinder block temperature signals. Based on the engine speed signal, the jet pulse width calibration table is used to find the jet pulse width that matches the engine speed signal; based on the engine speed signal, the ignition advance angle calibration table is used to find the ignition advance angle that matches the engine speed signal. Based on the cylinder block temperature signal, the jet compensation calibration table is used to find the jet pulse width compensation coefficient that matches the cylinder block temperature signal. Based on the jet pulse width and the jet pulse width compensation coefficient, the temperature-compensated jet pulse width is obtained; Based on the temperature-compensated jet pulse width, a corresponding PWM control signal is generated; based on the ignition advance angle, 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 control signal controls the ignition timing of the ignition device.

5. The control method for the multi-fuel generator set control system according to claim 4, characterized in that, Each jet pulse width calibration table is set with jet pulse width corresponding to different engine speeds and throttle openings; each ignition advance angle calibration table is set with ignition advance angle corresponding to different engine speeds and throttle openings; and each jet compensation calibration table is set with jet pulse width compensation coefficient corresponding to different throttle openings and cylinder block temperatures. Accordingly, based on the engine speed signal, the jet pulse width calibration table is used to find the jet pulse width that matches the engine speed signal; based on the engine speed signal, the ignition advance angle calibration table is used to find the ignition advance angle that matches the engine speed signal. Based on the cylinder block temperature signal, the jet compensation calibration table is used to find the jet pulse width compensation coefficient that matches the cylinder block temperature signal, including: Based on the engine speed signal and throttle opening, the jet pulse width calibration table is used to find the jet pulse width that matches the engine speed signal and throttle opening; based on the engine speed signal and throttle opening, the ignition advance angle calibration table is used to find the ignition advance angle that matches the engine speed signal and throttle opening; based on the cylinder block temperature signal and throttle opening, the jet pulse width compensation coefficient is used to find the jet pulse width compensation coefficient that matches the cylinder block temperature signal and throttle opening.

6. The control method for the multi-fuel generator set control system according to claim 4, characterized in that, Each jet pulse width calibration table is set with jet pulse width corresponding to different engine speeds and power generation, each ignition advance angle calibration table is set with ignition advance angle corresponding to different engine speeds and power generation, and each jet compensation calibration table is set with jet pulse width compensation coefficient corresponding to different power generation and cylinder block temperature.

7. The control method for the multi-fuel generator set control system according to claim 4, characterized in that, Based on the jet pulse width and the jet pulse width compensation coefficient, the temperature-compensated jet pulse width is obtained, including: Obtain preset rules; wherein, the preset rules are functions constructed based on the operational relationship between jet pulse width, jet pulse width compensation coefficient and set values; Based on the jet pulse width and the jet pulse width compensation coefficient, the temperature-compensated jet pulse width is obtained using the preset rule.

8. The control method for the multi-fuel generator set control system according to claim 4, characterized in that, When the fuel type signal indicates that the currently selected engine fuel is gaseous fuel, before searching the preset engine control parameter database for the corresponding jet pulse width calibration table, ignition advance angle calibration table, and jet compensation calibration table based on the fuel type signal, the following steps are also included: By adjusting the injection pulse width compensation coefficient to ensure the air-fuel ratio is normal at the current cylinder block temperature, the injection pulse width compensation coefficient corresponding to different throttle opening and cylinder block temperature information is determined through multiple tests.

9. The control method for the multi-fuel generator set control system according to claim 4, characterized in that, The gaseous fuel is LPG, NG, or hydrogen.

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 or 2.

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