Safety control system and control method for multi-fuel electronic injection generator set

Abstract

The present invention relates to the technical field of multi-fuel generator sets, relates to a safety control system and control method for a multi-fuel electronic injection generator set, and solves the problems that the consistency between selected fuels and actually supplied fuels cannot be determined and efficient exhaust treatment cannot be guaranteed. The safety control system for a multi-fuel electronic injection generator set comprises an ECU, and a fuel oil electronic injection system and a fuel gas electronic injection system which are electrically connected to the ECU; an electronic fuel selection switch is arranged between the fuel oil electronic injection system and the fuel gas electronic injection system and the ECU; the electronic fuel selection switch is used for selecting, by means of an electronic button, the type of a fuel to be supplied and determining the consistency between the type of the selected fuel and the type of the actually supplied fuel; an exhaust emission control mechanism is arranged between the ECU and an engine; the exhaust emission control mechanism comprises a first oxygen sensor and a catalytic converter; the ECU comprises a correction unit used for improving the catalytic efficiency of the catalytic converter and having a temperature control protection function. The effects of effectively determining the consistency between selected fuels and supplied fuels and realizing high exhaust emission quality are achieved.

Description

Safety control system and control method for multi-fuel electronic fuel injection generator set Technical Field

[0001] The present invention belongs to the technical field of multi-fuel generator sets, and in particular relates to a safety control system and a control method for a multi-fuel electronic fuel injection generator set. Background Art

[0002] A multi-fuel generator set is a type of generator set that can use a variety of fuels as a power source, allowing it to select different fuels for power generation based on the needs. Common fuels include natural gas, liquefied petroleum gas, diesel, gasoline, ethanol, and biodiesel. The advantage of a multi-fuel generator set is that it allows for flexible fuel selection based on fuel prices and availability, reducing power generation costs.

[0003] In the existing technology, some multi-fuel generator sets use a knob-type multi-speed switch to allow the administrator to select the fuel mode, and this may require occupying more ports of the ECU. In addition, some existing technologies lack a simple and effective fuel judgment unit, and are unable to determine whether the actual input fuel type is consistent with the fuel type selected by the administrator. Inconsistency may cause certain safety issues and may also damage the generator set. In addition, some existing technologies lack a catalytic treatment mechanism for exhaust gas treatment, resulting in low exhaust emission quality and greater environmental pollution. Some existing technologies, although equipped with a catalytic treatment mechanism, often lack control over the air excess coefficient, that is, the air-fuel ratio. The catalytic converter cannot achieve maximum efficiency, and the exhaust emission quality is not high. At the same time, there is a lack of temperature protection function for the catalyst. When operating at full load, excessive temperature may affect the effectiveness of the catalyst. Summary of the Invention

[0004] One object of the present invention is to address the above-mentioned problems in the prior art and to propose a safety control system and control method for a multi-fuel electronic fuel injection generator set.

[0005] In order to achieve the purpose of the innovative present invention, the following technical solutions can be used: a safety control system for a multi-fuel electronic fuel injection generator set, including an ECU and a fuel electronic fuel injection system and a gas electronic fuel injection system electrically connected to the ECU, an electronic fuel selection switch is provided between the fuel electronic fuel injection system and the gas electronic fuel injection system and the ECU, and the electronic fuel selection switch is used to select the type of input fuel through an electronic button and make a consistency judgment with the actual supplied fuel type; an exhaust emission control mechanism is provided between the ECU and the engine, and the exhaust emission control mechanism includes a first oxygen sensor and a catalytic converter connected in sequence to the exhaust port of the engine, and the ECU includes a correction unit for improving the catalytic efficiency of the catalytic converter and having a temperature control protection function.

[0006] In the safety control system of the above-mentioned multi-fuel electronic fuel injection generator set, the electronic fuel selection switch is arranged between the ECU and the ground wire, and includes a plurality of electronic buttons, each of which corresponds to a different fuel type. The ECU includes a fuel selection port, and when different electronic buttons are pressed, the fuel selection port and the ground wire are connected in different circuit states; the ECU includes a fuel judgment unit for judging whether the actual input fuel is consistent with the fuel type selected by the electronic button.

[0007] In a multi-fuel electronic fuel injection generator set, the gas fuel system is controlled by a completely different electronic control system. The electronic fuel selection switch is provided with multiple push-button electronic buttons, which correspond to different fuel inputs. A fuel selection port is provided on the ECU. When each electronic button is pressed, the fuel selection port and the ground wire are connected in different states. In different states, the voltage of the fuel selection port is different. The ECU judges the fuel selection by the specific voltage value to enable the corresponding electronic control system. It has a simple structure and is easy to operate. The fuel judgment unit is used to detect whether the actual input fuel is consistent with the fuel type selected by the administrator through the electronic button, protecting the engine while being safer.

[0008] In the safety control system of the above-mentioned multi-fuel electronic fuel injection generator set, the electronic button is a piano-key type switch, and at least three are set, corresponding to gasoline, liquefied petroleum gas, and natural gas respectively; at least three parallel circuits are provided between the fuel selection port and the ground wire, including a first circuit, a second circuit, and a third circuit, and the electronic button is respectively connected in series to each parallel circuit to control the connection and disconnection of the circuit; the first circuit is a short-circuit path, including a short-circuit wire. When the circuit is connected, the fuel selection port voltage is 0; the second circuit is an open circuit. When the circuit is connected, the fuel selection port voltage is the ECU voltage; a fixed resistor is connected in series with the third circuit, and the fixed resistor is located between the ground wire and the electronic button. When the circuit is connected, the fuel selection port voltage is different from the previous two.

[0009] The piano-key switch ensures that only one of the electronic buttons is pressed, which helps accurately determine the fuel type. Three parallel circuits are set between the fuel selection port and the bottom line. Each parallel circuit is equipped with an electronic button to connect or disconnect the circuit. When the electronic button is pressed, the corresponding parallel circuit is connected. The first circuit is a short-circuit path, which is equivalent to connecting the ground wire and the fuel selection port through a wire. At this time, the voltage of the fuel selection port is 0; the second circuit is an open circuit. When this circuit is connected, the fuel selection port and the bottom line are disconnected. At this time, the voltage of this port is the ECU voltage; the third circuit has a fixed resistor connected in series. This resistor is located between the fuel selection port and the ground wire. At this time, the voltage of this port is a corresponding value. Of course, more parallel circuits can be set, and the voltage of the fuel selection port can be changed by changing the resistance value of the fixed resistor. The ECU activates the corresponding electronic control system based on the voltage of the fuel selection port.

[0010] In the safety control system of the above-mentioned multi-fuel electronic fuel injection generator set, the ECU includes a fuel type input unit and a fuel type detection unit, the fuel type input unit is electrically connected to the fuel selection port, and the fuel type detection unit is electrically connected to the fuel detection mechanism; the fuel detection mechanism includes a gas pressure detection component for detecting the pressure in the gas pipeline, and the ECU is provided with a fuel detection port, and the fuel detection port is electrically connected to the gas pressure detection component and the fuel type detection unit respectively.

[0011] The fuel input unit is electrically connected to the fuel selection port. The voltage at this port determines the administrator's selected fuel type. The fuel type detection unit uses a fuel detection mechanism to determine the actual fuel type input. The ECU compares the analysis results of the fuel type input unit and the fuel type detection unit to determine whether the administrator's selected fuel type is consistent with the actual input type, and issues an alarm if there is a discrepancy. The judgment between oil and gas is relatively intuitive and belongs to existing technology, so we will not elaborate on it in detail. The fuel detection mechanism here mainly determines and detects the specific type of gas.

[0012] In the safety control system of the above-mentioned multi-fuel electronic fuel injection generator set, each of the electronic buttons is provided with an indicator light assembly, and the ECU includes a fuel judgment unit for judging whether the fuel selection type and the fuel input type are consistent, and the fuel judgment unit is electrically connected to the fuel type input unit and the fuel type detection unit respectively, and the indicator light assembly is electrically connected to the fuel judgment unit; the ECU includes an emergency stop unit, and the emergency stop unit is electrically connected to the fuel judgment unit, for shutting down when the judgment results are inconsistent.

[0013] The indicator light assembly on the electronic button and the fuel judgment unit control the indicator light assembly to make corresponding lighting indications through the output results of the fuel type input unit and the fuel type detection unit. For example, when it is just started, the indicator light assembly on the pressed electronic button emits yellow light, and when the fuel type detection unit completes the detection and determines that it is consistent, it emits green light, and emits red light when it is inconsistent.

[0014] In the safety control system of the above-mentioned multi-fuel electronic fuel injection generator set, the exhaust emission control mechanism includes an exhaust gas treatment system, which includes a first oxygen sensor and a muffler containing the catalytic converter connected in sequence to the engine exhaust port. The first oxygen sensor is used to detect the oxygen content data of the exhaust gas and transmit it to the ECU. The engine is also provided with an intake passage, and the EC includes a correction unit for coordinating the fuel supply rate of the fuel electronic fuel injection system and the gas electronic fuel injection system and the intake rate of the intake passage.

[0015] The exhaust emission control mechanism is connected to the fuel electronic injection system and the gas electronic injection system, which is used to control the fuel supply to the engine. Air is input from the intake channel to ensure the combustion of the fuel in the engine. A first oxygen sensor and a muffler are provided on the exhaust port of the engine. The first oxygen sensor is used to detect the oxygen content in the exhaust gas and transmit the oxygen content data to the ECU. The ECU obtains the air excess coefficient based on the oxygen content data analysis. The muffler is used to reduce the exhaust gas exhaust noise. A catalytic converter is provided in the muffler, which can catalyze NO, HC, and CO in the exhaust gas and improve the exhaust emission quality. For the catalytic converter, when the air excess coefficient is 1, the catalytic treatment effect can be balanced and maximized. The correction unit adjusts the air excess coefficient to always be near 1 by coordinating the input of fuel and air, thereby maximizing the efficiency of the catalytic converter and improving the exhaust emission quality.

[0016] In the safety control system of the above-mentioned multi-fuel electronic fuel injection generator set, the fuel electronic fuel injection system includes an oil circuit connected to the engine and a fuel nozzle arranged on the oil circuit for controlling on and off, and the fuel nozzle is electrically connected to the ECU; the gas electronic fuel injection system includes an air circuit and a gas flow control component arranged on the air circuit for controlling on and off, and the gas flow control component is electrically connected to the ECU, and the gas flow control component includes a stepper motor and / or solenoid valve for controlling the gas throttle; the intake passage is provided with a throttle assembly and a throttle control motor for controlling its opening, and the throttle control motor is electrically connected to the ECU.

[0017] The fuel nozzle can be opened and closed electronically to inject fuel into the engine's combustion chamber. The fuel delivery rate is controlled by controlling the nozzle's opening time. The gas flow control assembly uses a solenoid valve or stepper motor to open and close the gas line. The solenoid valve opens and closes the gas line by energizing and de-energizing the solenoid coil. When energized, the coil drives the sealing core upward, opening the gas line for gas input. When de-energized, the compression spring within the solenoid valve and the gas pressure on both sides of the sealing core differ, shutting off the gas line and achieving a reliable shutdown. When a stepper motor is used, the ECU controls the gas intake volume through the stepper motor and the gas throttle position. The tapered core of the stepper motor is positioned differently at the end of the gas line, creating different gas flow areas and thus controlling the gas flow rate. The negative pressure of the engine draws in air, and the throttle control motor adjusts the intake area of ​​the intake passage by controlling the opening of the throttle assembly, thereby controlling the efficiency of air input. Among them, the main structure of the oil circuit and the gas circuit is the existing technology and will not be elaborated here. The structural details and principles of the specific switching channels of the fuel nozzle, stepper motor, solenoid valve, and throttle control motor are common knowledge in the existing technology and will not be elaborated here.

[0018] In the safety control system of the above-mentioned multi-fuel electronic fuel injection generator set, the correction unit is electrically connected to the gas flow control component, the fuel nozzle and the throttle control motor respectively, and the correction unit adjusts the fuel supply and intake volume according to the oxygen content data to control the air excess coefficient to be close to or equal to 1; a temperature sensor is provided in the muffler, and the temperature sensor is electrically connected to the correction unit; the temperature sensor detects the temperature data of the catalyst and transmits it to the correction unit, and the correction unit temporarily controls the air excess coefficient to be greater than 1 when the temperature of the catalyst rises abnormally.

[0019] The correction unit controls the fuel and air input rates by controlling the gas flow control assembly, fuel injector, and throttle control motor. By coordinating the fuel and air supply rates, the air excess coefficient (α) is controlled. The air excess coefficient (α) = 21 / (21-O2), where O2 is the oxygen content. The correction unit aims to maintain the air excess coefficient near 1, maximizing the catalytic efficiency of the catalyst and improving exhaust emissions.

[0020] In the safety control system of the above-mentioned multi-fuel electronic fuel injection generator set, a second oxygen sensor is provided at the rear end of the muffler, and the second oxygen sensor is electrically connected to the ECU to transmit the oxygen content data of the exhaust gas after catalysis by the catalyst to the ECU; the ECU includes a catalyst monitoring unit, and the oxygen content data of the first oxygen sensor and the second oxygen sensor are transmitted to the catalyst monitoring unit, which is used to judge the effectiveness of the catalyst by comparison and to make a reminder interaction when it is judged to be invalid.

[0021] Another object of the present invention is to address the above-mentioned problems existing in the prior art and to propose a safety control method for a multi-fuel electronic fuel injection generator set. To achieve this innovative object of the present invention, the following technical solutions can be used: The safety control method for a multi-fuel electronic fuel injection generator set is applicable to the safety control system of the multi-fuel electronic fuel injection generator set described above, and includes the following steps:

[0022] S1, fuel mode selection, select the fuel input type through the electronic fuel selection switch, the ECU determines the input fuel through the voltage value of the fuel selection port and activates the corresponding electronic control system;

[0023] S2. Check the consistency between the fuel selection and actual input in gas mode. After the engine is started, the generator set is temporarily unloaded. The gas pressure detection component detects the gas pipeline pressure at a preset time and transmits the pressure data to the ECU. The ECU's fuel judgment unit compares and analyzes the average value of this pressure data with the preset pressure value to obtain specific input fuel information, and compares and verifies this information with the fuel information selected by the fuel selection port. S2.1. If the verification is inconsistent, the ECU's emergency shutdown unit will control the shutdown and issue an alarm. S2.2. If the verification is consistent, the generator set is allowed to load.

[0024] S3. Calculation of the air excess coefficient: The first oxygen sensor detects the oxygen content of the exhaust gas and transmits the oxygen content data to the ECU. The ECU's correction unit calculates the air excess coefficient. S3.1. Correction of the air excess coefficient in fuel mode: The correction unit adjusts the next fuel injection amount based on the air excess coefficient by controlling the on-off time of the fuel nozzle and / or controls the opening of the throttle assembly via the throttle control motor to adjust the air excess coefficient to 1 and maintain it. S3.2. Correction of the air excess coefficient in gas mode: The correction unit controls the gas flow control assembly to control the gas intake amount based on the air excess coefficient and / or controls the opening of the throttle assembly via the throttle control motor to adjust the air excess coefficient to 1 and maintain it.

[0025] S4: Catalyst high temperature protection: The temperature sensor detects the catalyst temperature in real time and transmits it to the ECU. When the temperature is higher than the preset value, the correction unit coordinates the fuel supply and intake air volume to adjust the air excess coefficient to be higher than 1. After the temperature drops to the preset normal range, the air excess coefficient is adjusted to 1 and maintained;

[0026] S5. Catalyst effectiveness monitoring: The second oxygen sensor detects the oxygen content of the exhaust gas after catalytic treatment and transmits the oxygen content data to the ECU. The catalyst monitoring unit of the ECU compares the oxygen content data of the first oxygen sensor and the second oxygen sensor. When the difference is less than the preset value, the catalyst is determined to be failed and a reminder interaction is issued. Otherwise, the catalyst is determined to be normal.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] 1. The present invention is used to safely control a multi-fuel electronic fuel injection generator set, wherein the fuel electronic fuel injection system and the gas electronic fuel injection system are connected to the engine to control the corresponding fuel input into the engine, wherein different fuels are controlled by independent electronic control systems, and the electronic fuel selection switch allows the administrator to select the fuel type through an electronic button and transmit the fuel information to the ECU. The ECU accesses the corresponding electronic control system according to the selection of the electronic button. In addition, the electronic fuel selection switch is also connected to a fuel judgment unit, which can compare and analyze the fuel selection type and the actual supply type to prevent safety and equipment damage problems caused by the mismatch between the electronic control system and the fuel type. The exhaust emission control mechanism catalytically processes NO, HC, and CO in the exhaust gas through the catalytic converter to improve the emission quality. A first oxygen sensor is provided between the catalytic converter and the exhaust outlet to detect the oxygen content of the exhaust gas and transmit the oxygen content data to the ECU. The correction unit of the ECU calculates the air excess coefficient based on the oxygen content data. The catalytic converter can achieve maximum catalytic efficiency when the air excess coefficient is near 1. The correction unit adjusts the air excess coefficient by controlling the fuel supply and the air intake volume, and controls the air-fuel ratio to maximize the function of the catalytic converter and further improve the exhaust emission quality. Moreover, the correction unit also has a temperature control protection function for the catalytic converter. When the temperature is too high, the air excess coefficient is adjusted to reduce the exhaust temperature to prevent high temperature from causing irreversible damage to the catalytic converter, thereby ensuring the effectiveness of the catalytic converter. Of course, it also has a certain control and protection effect on the temperature of the place of use.

[0029] 2. Since different gases have different supply pressures, the gas pressure in the gas pipeline is detected by the gas pressure detection component and compared with the corresponding value of the preset pressure to determine the type of gas. Specifically, the gas pressure detection component detects the pressure value at the preset time and uses the average value of the pressure value to participate in specific judgments, thereby improving the accuracy of judgment.

[0030] 3. When the fuel selected by the administrator is inconsistent with the actual input fuel, the emergency stop unit will shut down the engine urgently, which is highly safe and avoids damage to the engine.

[0031] 4. Excessively high temperatures can cause irreversible damage to the catalytic converter, especially when the engine is running at full load or in abnormal conditions, the temperature will rise accordingly. The temperature sensor monitors the temperature in the catalytic converter in real time and transmits the temperature data to the ECU. When the temperature is about to be too high, the ECU adjusts the fuel and air supply ratio through the correction unit. While ensuring stable engine operation, it increases the air excess coefficient and adopts a rich combustion control strategy to obtain a relatively low exhaust temperature to prevent the catalytic converter from being damaged by high temperature.

[0032] 5. The second oxygen sensor detects the oxygen content of exhaust gas after treatment with the catalytic converter. By comparing the oxygen content data obtained by the first oxygen sensor with the oxygen content data obtained by the first oxygen sensor, the effectiveness of the catalytic converter can be determined, and problems with the catalytic converter can be promptly identified to ensure high-quality exhaust emissions. The oxygen content data from the first and second oxygen sensors are transmitted to the catalyst monitoring unit of the ECU. The catalyst monitoring unit specifically compares, analyzes, and determines the effectiveness of the catalyst. If the effectiveness is insufficient, the catalyst monitoring unit will promptly issue corresponding interactive reminders, helping to promptly identify catalytic converter problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] FIG1 is an overall schematic diagram of a generator set provided by the present invention;

[0034] FIG2 is a simplified schematic diagram of the connection between the ECU, the electronic button, and the fuel detection mechanism provided by the present invention;

[0035] FIG3 is a schematic diagram of the composition of an ECU related to an electronic fuel selection switch provided by the present invention;

[0036] FIG4 is a schematic diagram showing the connection relationship between the ECU, the engine, and various system units related to the exhaust emission control mechanism provided by the present invention;

[0037] FIG5 is a simplified schematic diagram of the connection relationship between the components of the exhaust gas treatment system provided by the present invention;

[0038] FIG6 is a flow chart of the safety control method provided by the present invention. DETAILED DESCRIPTION

[0039] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0040] As shown in Figures 1-5, the safety control system of the multi-fuel electronic fuel injection generator set includes an ECU1 and a fuel electronic fuel injection system 5 and a gas electronic fuel injection system 6 electrically connected to the ECU1. An electronic fuel selection switch is provided between the fuel electronic fuel injection system 5 and the gas electronic fuel injection system 6 and the ECU1. The electronic fuel selection switch is used to select the type of input fuel through an electronic button 21 and to make a consistency judgment with the actual supplied fuel type; an exhaust emission control mechanism is provided between the ECU1 and the engine 2, and the exhaust emission control mechanism includes a first oxygen sensor 71 and a catalytic converter 75 connected in sequence to the exhaust port of the engine 2, and the ECU1 includes a correction unit 17 for improving the catalytic efficiency of the catalytic converter 75 and having a temperature control protection function.

[0041] This embodiment is used to safely control a multi-fuel electronic fuel injection generator set, wherein the fuel electronic fuel injection system 5 and the gas electronic fuel injection system 6 are connected to the engine 2 for controlling the corresponding fuel input into the engine 2, wherein different fuels are controlled by independent electronic control systems, and the electronic fuel selection switch is used by the administrator to select the fuel type through the electronic button 21, and the fuel information is transmitted to the ECU1, and the ECU1 is connected to the corresponding electronic control system according to the selection of the electronic button 21. In addition, the electronic fuel selection switch is also connected to the fuel judgment unit 15, which can compare and analyze the fuel selection type and the actual supply type to prevent safety and equipment damage problems caused by the mismatch between the electronic control system and the fuel type. The exhaust emission control mechanism catalytically processes NO, HC, and CO in the exhaust gas through the catalytic converter 75 to improve the emission quality. A first oxygen sensor 71 is provided between the catalytic converter 75 and the exhaust outlet for detecting the oxygen content of the exhaust gas and transmitting the oxygen content data to the ECU 1. The correction unit 17 of the ECU 1 calculates the air excess coefficient based on the oxygen content data. The catalytic converter 75 can achieve maximum catalytic efficiency when the air excess coefficient is near 1. The correction unit 17 adjusts the air excess coefficient by controlling the fuel supply and air intake volume to control the air-fuel ratio to maximize the function of the catalytic converter 75 and further improve the exhaust emission quality. Moreover, the correction unit 17 also has a temperature control protection function for the catalytic converter 75. When the temperature is too high, the air excess coefficient is adjusted to reduce the exhaust temperature to prevent high temperature from causing irreversible damage to the catalytic converter 75, thereby ensuring the effectiveness of the catalytic converter 75. Of course, it also has a certain control and protection effect on the temperature of the use site.

[0042] As shown in Figures 1-3, the electronic fuel selection switch is arranged between the ECU1 and the ground line 31, and includes a number of electronic buttons 21. The electronic buttons 21 correspond to different fuel types. The ECU1 includes a fuel selection port 11. When different electronic buttons 21 are pressed, the fuel selection port 11 and the ground line 31 are connected in different circuit states; the ECU1 includes a fuel judgment unit 15 for judging whether the actual input fuel is consistent with the fuel type selected by the electronic button 21.

[0043] In a multi-fuel electronic fuel injection generator set, the gas fuel system is controlled by completely different electronic control systems. The electronic fuel selection switch is provided with multiple push-button electronic buttons 21, which correspond to different fuel inputs respectively. A fuel selection port 11 is provided on the ECU1. When each electronic button 21 is pressed, the fuel selection port 11 and the ground wire 31 are connected in different states. In different states, the voltage of the fuel selection port 11 is different. The ECU1 judges the fuel selection by the specific voltage value to enable the corresponding electronic control system. The structure is simple and the operation is convenient. The fuel judgment unit 15 is used to detect whether the actual input fuel is consistent with the fuel type selected by the administrator through the electronic button 21, protecting the engine 2 while being safer.

[0044] In this embodiment, the electronic button 21 is a piano-key type switch, and at least three are provided, corresponding to gasoline, liquefied petroleum gas, and natural gas respectively; at least three parallel circuits are provided between the fuel selection port 11 and the ground wire 31, including a first circuit 32, a second circuit 33, and a third circuit 34. The electronic button 21 is connected in series with each parallel circuit to control the connection and disconnection of the circuit; the first circuit 32 is a short-circuit path, including a short-circuit wire. When this circuit is connected, the voltage of the fuel selection port 11 is 0; the second circuit 33 is an open circuit. When this circuit is connected, the voltage of the fuel selection port 11 is the ECU1 voltage; a fixed resistor 35 is connected in series with the third circuit 34. The fixed resistor 35 is located between the ground wire 31 and the electronic button 21. When this circuit is connected, the voltage of the fuel selection port 11 is different from the previous two.

[0045] The piano-key switch ensures that only one of the electronic buttons 21 is pressed, facilitating accurate fuel type determination. Three parallel circuits are provided between the fuel selection port 11 and the bottom line. Each parallel circuit is connected to an electronic button 21 to connect or disconnect the circuit. Pressing an electronic button 21 connects the corresponding parallel circuit. The first circuit 32 is a short-circuit path, effectively connecting the ground line 31 and the fuel selection port 11 via a wire. In this case, the voltage at the fuel selection port 11 is zero. The second circuit 33 is an open circuit. When connected, the fuel selection port 11 and the bottom line are disconnected, and the voltage at this port is the ECU1 voltage. A fixed resistor 35 is connected in series with the third circuit 34, located between the fuel selection port 11 and the ground line 31. In this case, the voltage at this port is a corresponding value. Of course, more parallel circuits can be provided, and the voltage at the fuel selection port 11 can be adjusted by varying the resistance of the fixed resistor 35. The ECU1 activates the corresponding electronic control system based on the voltage at the fuel selection port 11.

[0046] As shown in Figure 3, ECU1 includes a fuel type input unit 13 and a fuel type detection unit 14. The fuel type input unit 13 is electrically connected to the fuel selection port 11, and the fuel type detection unit 14 is electrically connected to the fuel detection mechanism 4. The fuel detection mechanism 4 includes a gas pressure detection component for detecting the pressure in the gas pipeline. The ECU1 is provided with a fuel detection port 12, which is electrically connected to the gas pressure detection component and the fuel type detection unit 14 respectively.

[0047] The fuel input unit is electrically connected to the fuel selection port 11. The voltage at this port determines the fuel type selected by the administrator. The fuel type detection unit 14 detects the actual fuel type input through the fuel detection mechanism 4. The ECU 1 compares the analysis results of the fuel type input unit 13 and the fuel type detection unit 14 to determine whether the fuel type selected by the administrator is consistent with the actual input type, and issues an alarm if there is a discrepancy. The fuel detection mechanism 4 primarily determines the specific type of gas. Because different gases have different supply pressures, the gas pressure detection component detects the gas pressure in the gas pipeline and compares it with the corresponding preset pressure value to determine the gas type. Specifically, the gas pressure detection component detects the pressure value at a preset time and uses the average pressure value to participate in the specific judgment, improving the accuracy of the judgment.

[0048] As an optimization of this embodiment, each electronic button 21 is provided with an indicator light assembly 22, and the ECU1 includes a fuel judgment unit 15 for judging whether the fuel selection type and the fuel input type are consistent. The fuel judgment unit 15 is electrically connected to the fuel type input unit 13 and the fuel type detection unit 14 respectively, and the indicator light assembly 22 is electrically connected to the fuel judgment unit 15; the ECU1 includes an emergency stop unit 16, which is electrically connected to the fuel judgment unit 15 and is used to shut down when the judgment results are inconsistent.

[0049] The indicator light assembly 22 on the electronic button 21 is controlled by the fuel determination unit 15 based on the output of the fuel type input unit 13 and the fuel type detection unit 14 to illuminate accordingly. For example, upon startup, the indicator light assembly 22 on the pressed electronic button 21 illuminates yellow. After the fuel type detection unit 14 completes its inspection and determines that the fuel type is consistent, it illuminates green; otherwise, it illuminates red. If the fuel selected by the administrator is inconsistent with the actual input fuel, the emergency shutdown unit 16 will shut down the engine 2, providing increased safety while preventing damage to the engine 2.

[0050] As shown in Figures 4 and 5, the exhaust emission control mechanism includes an exhaust treatment system 7, which includes a first oxygen sensor 71 and a muffler 72 containing a catalyst 75, which are sequentially connected to the exhaust outlet of the engine 2. The first oxygen sensor 71 is used to detect the oxygen content of the exhaust gas and transmit the data to the ECU 1. The engine 2 is also provided with an intake passage 8. The ECU includes a correction unit 17 for coordinating the fuel supply rate of the fuel electronic injection system 5 and the gas electronic injection system 6 and the intake rate of the intake passage 8.

[0051] The exhaust emission control mechanism is connected to the fuel electronic injection system 5 and the gas electronic injection system 6, which are used to control the fuel supply to the engine 2. Air is input from the intake channel 8 to ensure the combustion of the fuel in the engine 2. A first oxygen sensor 71 and a muffler 72 are provided on the exhaust outlet of the engine 2. The first oxygen sensor 71 is used to detect the oxygen content in the exhaust gas and transmit the oxygen content data to the ECU1. The ECU1 obtains the air excess coefficient based on the oxygen content data analysis. The muffler 72 is used to reduce the exhaust gas elimination noise. A catalytic converter 75 is provided in the muffler 72, which can catalyze NO, HC, and CO in the exhaust gas to improve the exhaust emission quality. For the catalytic converter 75, when the air excess coefficient is 1, the catalytic treatment effect can be balanced and maximized. The correction unit 17 adjusts the air excess coefficient to always be near 1 by coordinating the input of fuel and air, thereby giving full play to the maximum efficiency of the catalytic converter 75 and improving the exhaust emission quality.

[0052] In this embodiment, the fuel electronic injection system 5 includes an oil circuit 51 connected to the engine 2 and a fuel nozzle 52 arranged on the oil circuit 51 for controlling on and off, and the fuel nozzle 52 is electrically connected to the ECU1; the gas electronic injection system 6 includes an air circuit 61 and a gas flow control component 62 arranged on the air circuit 61 for controlling on and off, and the gas flow control component 62 is electrically connected to the ECU1, and the gas flow control component 62 includes a stepper motor for controlling the gas throttle; the intake passage 8 is provided with a throttle component 81 and a throttle control motor 82 for controlling its opening, and the throttle control motor 82 is electrically connected to the ECU1.

[0053] The fuel nozzle 52 can be opened and closed electronically to inject fuel into the combustion chamber of the engine 2. The fuel input rate is controlled by controlling the opening time of the fuel nozzle 52. The gas flow control assembly 62 uses a solenoid valve or a stepper motor to open and close the gas path 61. When a stepper motor is used for the gas flow control assembly 62, the ECU 1 controls the gas intake volume by coordinating the stepper motor with the gas throttle position. The tapered core shaft on the stepper motor is positioned differently at the end of the gas path 61 to achieve different gas flow areas, thereby controlling the gas flow rate. The negative pressure of the engine 2 during operation draws in air. The throttle control motor 82 adjusts the intake area of ​​the intake passage 8 by controlling the opening of the throttle assembly 81, thereby controlling the air intake efficiency.

[0054] As shown in Figure 4, the correction unit 17 is electrically connected to the gas flow control component 62, the fuel nozzle 52 and the throttle control motor 82 respectively. The correction unit 17 adjusts the fuel supply and intake volume according to the oxygen content data to control the air excess coefficient to be close to or equal to 1; a temperature sensor 73 is provided in the muffler 72, and the temperature sensor 73 is electrically connected to the correction unit 17; the temperature sensor 73 detects the temperature data of the catalyst 75 and transmits it to the correction unit 17. The correction unit 17 temporarily controls the air excess coefficient to be greater than 1 when the temperature of the catalyst 75 rises abnormally.

[0055] The correction unit 17 controls the fuel and air input rates by controlling the gas flow control assembly 62 or the fuel nozzle 52 and the throttle control motor 82, and controls the air excess coefficient by coordinating the fuel and air supply rates. The air excess coefficient α = 21 / (21-O2), where O2 is the oxygen content. The correction unit 17 targets the air excess coefficient to be near 1, maximizing the catalytic efficiency of the catalyst 75 and improving the exhaust emission quality. However, excessively high temperatures can cause irreversible damage to the catalyst 75, especially when the engine 2 is running at full load or in abnormal conditions, the temperature will rise accordingly. The temperature sensor 73 monitors the temperature in the catalyst 75 in real time and transmits the temperature data to the ECU1. When the temperature is about to be too high, the ECU1 adjusts the fuel and air supply ratio through the correction unit 17, and increases the air excess coefficient while ensuring the stable operation of the engine 2. A relatively rich combustion control strategy is adopted to obtain a relatively low exhaust temperature to prevent the catalyst 75 from being damaged by high temperature.

[0056] As an optimization of this embodiment, a second oxygen sensor 74 is provided at the rear end of the muffler 72. The second oxygen sensor 74 is electrically connected to the ECU1 to transmit the oxygen content data of the exhaust gas after catalysis by the catalyst to the ECU1; the ECU1 includes a catalyst monitoring unit 18, and the oxygen content data of the first oxygen sensor 71 and the second oxygen sensor 74 are transmitted to the catalyst monitoring unit 18, which is used to judge the effectiveness of the catalyst by comparison and to make a reminder interaction when it is judged to be invalid.

[0057] Second oxygen sensor 74 detects the oxygen content of exhaust gas after treatment by catalytic converter 75. By comparing the oxygen content data obtained by first oxygen sensor 71 with the oxygen content data obtained by first oxygen sensor 71, it determines the effectiveness of catalytic converter 75 and promptly identifies any problems with catalytic converter 75, thereby ensuring high-quality exhaust emissions. The oxygen content data from first and second oxygen sensors 71 and 74 are transmitted to catalyst monitoring unit 18 of ECU 1. Catalyst monitoring unit 18 compares, analyzes, and determines the effectiveness of the catalyst. If the effectiveness is insufficient, it provides timely interactive notifications, helping to promptly identify any problems with catalytic converter 75.

[0058] As shown in FIG6 , the safety control method of the multi-fuel EFI generator set provided by the present invention is applicable to the safety control system of the multi-fuel EFI generator set described above, and includes the following steps:

[0059] S1, fuel mode selection, select the fuel input type through the electronic fuel selection switch, the ECU determines the input fuel through the voltage value of the fuel selection port and activates the corresponding electronic control system;

[0060] S2. Consistency verification of the fuel selected in gas mode and the actual input: After the engine is started, the generator set is temporarily unloaded. The gas pressure detection component detects the gas pipeline pressure for a preset time and transmits the pressure data to the ECU. The ECU's fuel judgment unit compares and analyzes the average value of the pressure data with the preset pressure value to obtain specific input fuel information, and compares and verifies this information with the fuel information selected by the fuel selection port;

[0061] S2.1. If the verification is inconsistent, the emergency stop unit of the ECU will stop the machine and give an alarm.

[0062] S2.2. When the verification is consistent, the generator set is allowed to be loaded;

[0063] S3, air excess coefficient calculation: the first oxygen sensor detects the oxygen content of the exhaust gas and transmits the oxygen content data to the ECU, and the correction unit of the ECU calculates the air excess coefficient;

[0064] S3.1. Fuel mode air excess coefficient correction: The correction unit adjusts the next fuel injection amount based on the air excess coefficient by controlling the fuel nozzle on-off time and / or controlling the throttle assembly opening via the throttle control motor to adjust the air excess coefficient to 1 and maintain it;

[0065] S3.2. Correction of the excess air coefficient in the gas mode: The correction unit controls the gas flow control component to control the gas intake volume based on the excess air coefficient, and / or controls the opening of the throttle component via the throttle control motor to adjust the excess air coefficient to 1 and maintain it;

[0066] S4: Catalyst high temperature protection: The temperature sensor detects the catalyst temperature in real time and transmits it to the ECU. When the temperature is higher than the preset value, the correction unit coordinates the fuel supply and intake air volume to adjust the air excess coefficient to be higher than 1. After the temperature drops to the preset normal range, the air excess coefficient is adjusted to 1 and maintained;

[0067] S5. Catalyst effectiveness monitoring: The second oxygen sensor detects the oxygen content of the exhaust gas after catalytic treatment and transmits the oxygen content data to the ECU. The catalyst monitoring unit of the ECU compares the oxygen content data of the first oxygen sensor and the second oxygen sensor. When the difference is less than the preset value, the catalyst is determined to be failed and a reminder interaction is issued. Otherwise, the catalyst is determined to be normal.

[0068] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. Safety control system of multi-fuel electronic fuel injection generator set, characterized by: It includes an ECU and a fuel electronic injection system and a gas electronic injection system electrically connected to the ECU. An electronic fuel selection switch is provided between the fuel electronic injection system, the gas electronic injection system and the ECU. The electronic fuel selection switch is used to select the type of input fuel through an electronic button and make consistency judgment with the actual supplied fuel type; an exhaust emission control mechanism is provided between the ECU and the engine, and the exhaust emission control mechanism includes a first oxygen sensor and a catalytic converter connected in sequence to the engine exhaust port. The ECU includes a correction unit for improving the catalytic efficiency of the catalytic converter and having a temperature control protection function.

2. The safety control system of the multi-fuel electronic fuel injection generator set according to claim 1 is characterized in that: The electronic fuel selection switch is arranged between the ECU and the ground wire, and includes several electronic buttons, each of which corresponds to a different fuel type. The ECU includes a fuel selection port. When different electronic buttons are pressed, the fuel selection port and the ground wire are connected in different circuit states; the ECU includes a fuel judgment unit for judging whether the actual input fuel is consistent with the fuel type selected by the electronic button.

3. The safety control system of the multi-fuel electronic fuel injection generator set according to claim 2, characterized in that: The electronic buttons are piano-key switches, with at least three of them corresponding to gasoline, liquefied petroleum gas, and natural gas respectively; at least three parallel circuits are provided between the fuel selection port and the ground wire, including a first circuit, a second circuit, and a third circuit, and the electronic buttons are connected in series to each parallel circuit to control the connection and disconnection of the circuit; the first circuit is a short-circuit path, including a short-circuit wire. When the first circuit is connected, the voltage of the fuel selection port is 0; the second circuit is an open circuit. When the second circuit is connected, the voltage of the fuel selection port is the ECU voltage; a fixed resistor is connected in series to the third circuit, and the fixed resistor is located between the ground wire and the electronic button. When the third circuit is connected, the voltage of the fuel selection port is different from the previous two.

4. The safety control system of the multi-fuel electronic fuel injection generator set according to claim 2, characterized in that: The ECU includes a fuel type input unit and a fuel type detection unit. The fuel type input unit is electrically connected to the fuel selection port, and the fuel type detection unit is electrically connected to the fuel detection mechanism. The fuel detection mechanism includes a gas pressure detection component for detecting the pressure in the gas pipeline. The ECU is provided with a fuel detection port, and the fuel detection port is electrically connected to the gas pressure detection component and the fuel type detection unit respectively.

5. The safety control system of the multi-fuel electronic fuel injection generator set according to claim 4, characterized in that: Each of the electronic buttons is provided with an indicator light assembly, and the ECU includes a fuel judgment unit for judging whether the fuel selection type and the fuel input type are consistent, and the fuel judgment unit is electrically connected to the fuel type input unit and the fuel type detection unit respectively, and the indicator light assembly is electrically connected to the fuel judgment unit; the ECU includes an emergency stop unit, and the emergency stop unit is electrically connected to the fuel judgment unit, and is used to shut down when the judgment results are inconsistent.

6. The safety control system of the multi-fuel electronic fuel injection generator set according to claim 1, characterized in that: The exhaust emission control mechanism includes an exhaust gas treatment system, wherein the exhaust gas treatment system includes a first oxygen sensor and a muffler containing the catalyst, which are sequentially connected to the exhaust gas outlet of the engine. The first oxygen sensor is used to detect the oxygen content data of the exhaust gas and transmit it to the ECU. The engine is also provided with an intake passage. The ECU (1) includes a correction unit for coordinating the fuel supply rate of the fuel electronic injection system and the gas electronic injection system and the intake rate of the intake passage.

7. The safety control system of the multi-fuel electronic fuel injection generator set according to claim 6, characterized in that: The fuel electronic injection system includes an oil circuit connected to the engine and a fuel nozzle arranged on the oil circuit for controlling on and off, and the fuel nozzle is electrically connected to the ECU; the gas electronic injection system includes an air circuit and a gas flow control component arranged on the air circuit for controlling on and off, and the gas flow control component is electrically connected to the ECU, and the gas flow control component includes a stepper motor and / or a solenoid valve for controlling the gas throttle; the intake passage is provided with a throttle assembly and a throttle control motor for controlling its opening, and the throttle control motor is electrically connected to the ECU.

8. The safety control system for a multi-fuel electronic fuel injection generator set according to claim 7, characterized in that: The correction unit is electrically connected to the gas flow control component, the fuel nozzle and the throttle control motor respectively. The correction unit adjusts the fuel supply and the intake volume according to the oxygen content data to control the air excess coefficient to be close to or equal to 1; a temperature sensor is provided in the muffler, and the temperature sensor is electrically connected to the correction unit; the temperature sensor detects the temperature data of the catalyst and transmits it to the correction unit. The correction unit temporarily controls the air excess coefficient to be greater than 1 when the temperature of the catalyst rises abnormally.

9. The safety control system of the multi-fuel electronic fuel injection generator set according to claim 6, characterized in that: A second oxygen sensor is provided at the rear end of the muffler, which is electrically connected to the ECU to transmit data on the oxygen content of the exhaust gas after catalysis by the catalyst to the ECU; the ECU includes a catalyst monitoring unit, and the oxygen content data of the first oxygen sensor and the second oxygen sensor are transmitted to the catalyst monitoring unit, which is used to judge the effectiveness of the catalyst by comparison and to provide a reminder interaction when it is judged to be invalid.

10. A safety control method for a multi-fuel electronic fuel injection generator set, characterized in that: A safety control system applicable to the multi-fuel electronic fuel injection generator set according to any one of claims 1 to 9, comprising the following steps: S1, fuel mode selection, select the fuel input type through the electronic fuel selection switch, the ECU determines the input fuel through the voltage value of the fuel selection port and activates the corresponding electronic control system; S2. Consistency verification of the fuel selected in gas mode and the actual input: After the engine is started, the generator set is temporarily unloaded. The gas pressure detection component detects the gas pipeline pressure for a preset time and transmits the pressure data to the ECU. The ECU's fuel judgment unit compares and analyzes the average value of the pressure data with the preset pressure value to obtain specific input fuel information, and compares and verifies this information with the fuel information selected by the fuel selection port; S2.

1. If the verification is inconsistent, the emergency stop unit of the ECU will stop the machine and give an alarm. S2.

2. When the verification is consistent, the generator set is allowed to be loaded; S3, air excess coefficient analysis: the first oxygen sensor detects the oxygen content of the exhaust gas and transmits the oxygen content data to the ECU, and the correction unit of the ECU calculates the air excess coefficient; S3.

1. Fuel mode air excess coefficient correction: The correction unit adjusts the next fuel injection amount based on the air excess coefficient by controlling the fuel nozzle on-off time and / or controlling the throttle assembly opening via the throttle control motor to adjust the air excess coefficient to 1 and maintain it; S3.

2. Correction of the excess air coefficient in the gas mode: The correction unit controls the gas flow control component to control the gas intake volume based on the excess air coefficient, and / or controls the opening of the throttle component via the throttle control motor to adjust the excess air coefficient to 1 and maintain it; S4: Catalyst high temperature protection: The temperature sensor detects the catalyst temperature in real time and transmits it to the ECU. When the temperature is higher than the preset value, the correction unit coordinates the fuel supply and intake air volume to adjust the air excess coefficient to be higher than 1. After the temperature drops to the preset normal range, the air excess coefficient is adjusted to 1 and maintained; S5. Catalyst effectiveness monitoring: The second oxygen sensor detects the oxygen content of the exhaust gas after catalytic treatment and transmits the oxygen content data to the ECU. The catalyst monitoring unit of the ECU compares the oxygen content data of the first oxygen sensor and the second oxygen sensor. When the difference is less than the preset value, the catalyst is determined to be failed and a reminder interaction is issued. Otherwise, the catalyst is determined to be normal.

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