Fuel supply system of in-cylinder double direct injection engine

Abstract

The invention provides a fuel supply system of an in-cylinder double direct injection engine, and relates to the technical field of fuel supply. Comprising a high-pressure oil pump subsystem, a low-pressure oil pump subsystem, a fuel filter subsystem, a fuel guide rail subsystem, an oil sprayer subsystem, a fuel pressure sensor subsystem, a fuel control unit subsystem, a fuel tank subsystem and a fuel pipeline subsystem. According to the intelligent fuel oil supply system, fuel oil consumption is effectively reduced through a wireless fuel oil monitoring and control subsystem such as a variable flow fuel oil distribution subsystem and an intelligent fuel oil preheating subsystem, compared with a traditional fuel supply system, the fuel oil cost of a user is greatly saved, and the application of the wireless fuel oil monitoring and control subsystem and the fuel oil control subsystem based on artificial intelligence is more convenient. Remote real-time monitoring and intelligent control of the fuel oil system are achieved, a user can conveniently know the state of the system in time and conduct necessary adjustment, and meanwhile the self-adaptive capacity and the response speed of the system are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of fuel supply, and more specifically, particularly relates to a fuel supply system for an in-cylinder dual direct injection engine. Background Art

[0002] In the modern automobile industry, the fuel supply system of direct injection engines is one of the key factors that determine engine performance, fuel economy and emission levels. This system involves many key technologies such as high-pressure fuel pump technology, precise injection control technology, fuel pressure regulation technology, fuel quality monitoring technology, intelligent preheating technology, and wireless monitoring and control technology.

[0003] At present, in the field of automobile manufacturing, various manufacturers have adopted a variety of different equipment and methods to achieve efficient fuel supply. Some manufacturers use traditional mechanical oil pumps to provide fuel pressure, but this method has certain limitations in the accuracy and response speed of pressure regulation. In terms of fuel injection control, some manufacturers have adopted a relatively simple timed and quantitative injection strategy, which is difficult to flexibly adjust according to the real-time working conditions of the engine. The monitoring of fuel quality usually relies on regular laboratory testing, and real-time online monitoring cannot be achieved. In the preheating stage, the preheating method used by some systems is not efficient and cannot quickly adapt to different ambient temperatures. In addition, in the regulation of fuel pressure, some manufacturers rely on fixed pressure setting values ​​and cannot make adaptive adjustments according to the working mode of the engine.

[0004] However, these existing technologies and equipment have many problems in practical applications. First, it is difficult for traditional fuel supply systems to achieve precise control of fuel injection, resulting in incomplete combustion, affecting the power output and fuel economy of the engine. Secondly, the inflexibility and imprecision of fuel pressure regulation may lead to unstable fuel supply under different operating conditions, affecting the smooth operation of the engine. Furthermore, the lack of real-time and effective fuel quality monitoring means can easily cause engine failure and excessive emissions due to fuel quality problems. In addition, poor preheating effect will increase wear and pollutant emissions during cold start of the engine. Finally, the inability to adaptively adjust the fuel pressure according to the engine operating mode limits the performance optimization of the engine under different operating conditions. These problems urgently need to be solved by a more advanced, efficient and intelligent in-cylinder dual direct injection engine fuel supply system. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a fuel supply system for an in-cylinder dual direct injection engine to solve the above problems.

[0006] A fuel supply system for an in-cylinder direct injection engine, comprising a high-pressure fuel pump subsystem, a low-pressure fuel pump subsystem, a fuel filter subsystem, a fuel rail subsystem, an injector subsystem, a fuel pressure sensor subsystem, a fuel control unit subsystem, a fuel tank subsystem and a fuel pipeline subsystem. The fuel tank subsystem is connected to the low-pressure fuel pump subsystem through the fuel pipeline subsystem. The low-pressure fuel pump subsystem pressurizes the fuel and transports it to the fuel filter subsystem through the fuel pipeline subsystem. The filtered fuel then enters the high-pressure fuel pump subsystem through the fuel pipeline subsystem. The high-pressure fuel output by the high-pressure fuel pump subsystem is distributed to the injector subsystem through the fuel rail subsystem. The fuel pressure sensor subsystem is installed in the fuel rail subsystem or related pipelines and feeds back pressure data to the fuel control unit subsystem. The fuel control unit subsystem receives data from various sensors and controls and adjusts the low-pressure fuel pump subsystem, the high-pressure fuel pump subsystem, the injector subsystem, etc.;

[0007] Among them, for the high-pressure fuel pump subsystem, the relationship between its output pressure P_high and the engine speed n_engine is: P_high = k1 × n_engine + b1, where k1 and b1 are preset coefficients;

[0008] For the injector subsystem, the relationship between its injection quantity Q_inject and the high-pressure fuel pump output pressure P_high and the injection time t_inject is: Q_inject = k2 × P_high × t_inject, where k2 is a preset coefficient;

[0009] The fuel control unit subsystem determines the injection time t_inject according to the engine speed n_engine and the load load, following the following algorithm:

[0010] If (n_engine < n_thresh) && (load < load_thresh) Then (t_inject = f1(n_engine, load)) Else (t_inject = f2(n_engine, load)), where n_thresh and load_thresh are preset thresholds, and f1 and f2 are preset functions.

[0011] Preferably, the fuel supply system for the in-cylinder direct injection engine further includes an intelligent fuel preheating subsystem, and the relationship between its preheating temperature T_preheat and the ambient temperature T_ambient and the engine speed n_engine is: T_preheat = k3 × T_ambient + k4 × n_engine + b2, where k3, k4, and b2 are preset coefficients.

[0012] Preferably, the fuel supply system of the dual direct injection engine further includes a fuel quality monitoring subsystem, which is used for real-time detection of the water content w, impurity content c and octane number r of the fuel.

[0013] Preferably, the fuel supply system of the dual direct injection engine also includes a variable flow fuel distribution subsystem, and the relationship between the fuel flow Flow_cylinder_i distributed to the i-th cylinder and the load load_cylinder_i of the cylinder is: Flow_cylinder_i=k5×load_cylinder_i+b3, where k5 and b3 are preset coefficients.

[0014] Preferably, the fuel supply system of the dual direct injection engine further includes a fuel injection timing fine-tuning subsystem, and the relationship between the injection timing adjustment amount Delta_t_inject and the intake temperature T_intake, the reference intake temperature T_reference, the intake pressure P_intake, and the reference intake pressure P_reference is:

[0015] Delta_t_inject=k6X(T_intake-T_reference)+k7X(P_intake-P_reference)+b4, where k6, k7, and b4 are preset coefficients.

[0016] Preferably, the fuel supply system of the dual direct injection engine also includes a fuel pressure adaptive regulation subsystem, which adjusts the fuel pressure P_adjust according to the engine operating mode mode_engine, following: P_adjust = f3 (mode_engine), where f3 is a preset function.

[0017] Preferably, the fuel supply system of the dual direct injection engine also includes a wireless fuel monitoring and control subsystem, which is used for wirelessly transmitting key parameters of the fuel supply system.

[0018] Preferably, the fuel supply system of the dual direct injection engine also includes a fuel injection mode optimization subsystem, which has a plurality of preset fuel injection modes and can automatically switch according to the engine operating conditions and load.

[0019] Preferably, the fuel supply system of the dual direct injection engine further includes a fuel recovery and reuse subsystem, which is used to collect and process incompletely burned fuel vapor or excess fuel.

[0020] Preferably, the fuel supply system of the dual direct injection engine also includes an artificial intelligence-based fuel control subsystem, which uses a deep learning algorithm and experimental data training model to control fuel supply.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. Significantly improve fuel economy: The high-pressure oil pump subsystem in the present invention accurately outputs pressure according to the engine speed, the injector subsystem accurately controls the injection amount in combination with the high-pressure oil pump output pressure and the injection time, and the fuel control unit subsystem intelligently determines the injection time according to the engine speed and load. Through these precise fuel control strategies, as well as the synergy of the variable flow fuel distribution subsystem and the intelligent fuel preheating subsystem, fuel consumption is effectively reduced. Compared with the traditional fuel supply system, it greatly saves the user's fuel cost.

[0023] 2. Reduce exhaust pollutant emissions: Advanced injection mode optimization, adaptive fuel pressure adjustment and precise fuel injection control make combustion more complete, significantly reducing the emissions of pollutants such as carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx), making an outstanding contribution to environmental protection.

[0024] 3. Enhance engine power performance: Based on precise injection time and injection amount control, as well as automatic switching of injection modes according to different working conditions and loads, the engine power and torque output can be improved at different speeds, enhancing the vehicle's acceleration performance and driving ability.

[0025] 4. Improve system reliability and stability: Use high-quality materials and advanced manufacturing processes, such as high-strength aluminum alloy fuel rails, corrosion-resistant engineering plastic fuel tanks, etc., combined with a complete filtering, monitoring and pressure control mechanism to ensure the stable and reliable operation of the fuel supply system under various complex working conditions and reduce the occurrence of failures.

[0026] 5. Intelligent and convenient monitoring and management: The application of wireless fuel monitoring and control subsystem and artificial intelligence-based fuel control subsystem realizes remote real-time monitoring and intelligent control of the fuel system, which makes it convenient for users to understand the system status in time and make necessary adjustments, while improving the system's adaptability and response speed.

[0027] 6. Adapt to various working conditions and environments: Through the coordinated work of multiple subsystems, such as the fuel pressure adaptive regulation subsystem and the intelligent fuel preheating subsystem, it can adapt to different engine working modes, ambient temperature and other changes, ensuring high-quality fuel supply under various conditions and optimizing engine performance.

[0028] 7. Extend engine service life: Accurately control fuel supply to achieve a more ideal combustion process, reduce wear and impact on engine components, help extend engine service life and reduce maintenance costs.

[0029] 8. Improve fuel quality assurance: The fuel quality monitoring subsystem can detect key indicators such as the water content, impurity content and octane number of the fuel in real time to ensure that the fuel used meets the requirements and avoid damage to the engine due to fuel quality problems.

[0030] 9. Promote sustainable use of energy: The energy-saving and emission-reduction effects of the overall system help reduce dependence on limited fossil energy and meet the requirements of sustainable energy development.

[0031] 10. Easy to maintain and upgrade: The subsystems of the system are reasonably designed and clearly structured, making daily maintenance and troubleshooting easy. At the same time, some subsystems, such as the AI-based fuel control subsystem, have good upgradeability and can continuously optimize performance with technological development and data accumulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the system composition of the present invention. DETAILED DESCRIPTION

[0033] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0034] See also Figure 1 The present invention provides a fuel supply system for a dual direct injection engine, which aims to achieve more efficient and accurate fuel supply to optimize engine performance and save energy and reduce emissions. The system includes a high-pressure oil pump subsystem, a low-pressure oil pump subsystem, a fuel filter subsystem, a fuel rail subsystem, an injector subsystem, a fuel pressure sensor subsystem, a fuel control unit subsystem, a fuel tank system and a fuel pipeline subsystem.

[0035] The high-pressure oil pump subsystem is one of the core components of fuel supply. The relationship between its output pressure P_high and engine speed n_engine is:

[0036] P_high=k1×n_engine+b1. In actual implementation, the values ​​of coefficients k1 and b1 are determined through calibration of a large amount of experimental data. For example, for a certain type of engine, after repeated tests and data analysis, k1 is determined to be 0.05MPa / rpm, b1 is 10MPa, and when the engine speed is 3000rpm, the output pressure P_high of the high-pressure oil pump is calculated to be 25MPa.

[0037] The low-pressure oil pump subsystem usually adopts an electric structure to provide a stable fuel input for the high-pressure oil pump. Its working pressure is generally between 0.3-0.5MPa. In specific implementation, the appropriate low-pressure oil pump model is selected according to the maximum fuel demand and pressure requirements of the engine. Assuming that the fuel consumption rate of the engine at maximum power output is 0.25kg / kW·h, the maximum power is 200KW, and the average speed during operation is 4000rpm, the required fuel flow rate is about 20L / min. Based on this, a low-pressure oil pump with a flow rate of 25L / min and a pressure of 0.4MPa is selected to ensure that the demand is met and a certain margin is left.

[0038] The fuel filter adopts a multi-layer filtration structure, usually including a coarse filter layer and a fine filter layer. Its filtration accuracy is generally set at 5-10 microns. In actual operation, the pressure difference at both ends of the filter is regularly checked. Assuming that the initial pressure difference of the filter is 0.1MPa, when the pressure difference reaches 0.3MPa, the filter is considered clogged and needs to be replaced in time.

[0039] The fuel rail is made of high-strength aluminum alloy material, and is designed with smooth flow channels inside to reduce the resistance and pressure loss of fuel flow. A high-precision pressure sensor is installed on the rail, and its measurement accuracy can reach ±0.05MPa. The sensor monitors the fuel pressure in real time and transmits the data to the ECU.

[0040] The relationship between the injection quantity Q_inject of the injector subsystem, the output pressure P_high of the high-pressure oil pump, and the injection time t_inject is:

[0041] Q_inject=k2×P_high×t_inject. The value of coefficient k2 is determined by experimental calibration. For example, for a certain type of injector, k2 is 0.0005mL / MPa·ms. In practical applications, electromagnetic injectors are used, which have a short response time and can accurately control the injection timing and duration within milliseconds. Through the precise control of the ECU, the optimal injection strategy under different working conditions is achieved.

[0042] The fuel pressure sensor subsystem uses a high-precision piezoelectric pressure sensor with high sensitivity and fast response speed. The pressure sensor converts the pressure change in the fuel system into an electrical signal and transmits it to the ECU. The ECU compares the received pressure signal with the preset pressure value and adjusts the working state of the high-pressure fuel pump and related regulating valves to achieve stable control of the fuel pressure.

[0043] The fuel control unit subsystem determines the injection time t_inject according to the engine speed n_engine and load Ioad, following the following algorithm:

[0044] lf(n engine <nthresh )&&(load<load thresh )Then(t inject =f1(n engine ,load))Else(

[0045] t inject =f2(n engine , load));

[0046] The preset threshold n_thresh is set to 2500 rpm, Ioad_thresh is set to 70% load, f1 and f2 are functions obtained by fitting a large amount of experimental data. For example, f1 can be expressed as t inject =0.001×n engine +0.005×load-0.5;

[0047] f2 can be expressed as t inject =0.000 8 ×n engine +0.008×load-1;

[0048] In actual operation, the EOU receives signals from the engine speed sensor and load sensor in real time, calculates the optimal injection time according to the above algorithm, and accurately controls the operation of the injector.

[0049] The fuel tank of the fuel tank system is made of corrosion-resistant engineering plastics, with wave-breaking plates and liquid level sensors inside. The capacity of the fuel tank is designed according to the vehicle's mileage requirements. For example, for a long-distance bus, the fuel tank capacity is designed to be 300 liters.

[0050] The fuel pipeline in the fuel pipeline subsystem is made of high-pressure and corrosion-resistant stainless steel, and the inner diameter is determined according to the fuel flow and velocity requirements. Assuming the fuel flow rate is 2-5m / s and the flow rate is 20L / min, the inner diameter of the pipeline is selected to be 8mm, and the connection of the pipeline uses clamps and sealing rings with good sealing performance to ensure that there is no leakage of fuel.

[0051] The relationship between the preheating temperature T_preheat of the intelligent fuel preheating subsystem and the ambient temperature T_ambient and the engine speed n_engine is:

[0052] T preheat =k3×T ambient +k4×n engine +b2;

[0053] The coefficients k3 and k4 were determined to be 0.1, 0.02, and b2 to be 20 through experiments;

[0054] In actual application, when the ambient temperature is 0℃ and the engine speed is 2000rpm, the calculated preheating temperature is about 60℃. The electric heating element is used as the preheating device, and the fuel temperature is monitored in real time through the temperature sensor and fed back to the ECU, which controls the working power of the heating element to achieve precise fuel preheating control.

[0055] The fuel quality monitoring subsystem uses a capacitive sensor to detect the water content w of the fuel, and issues an alarm when the water content w exceeds 0.3%. An optical sensor is used to detect the impurity content c, and the level of impurity content is set according to different light transmittances. The octane number r of the fuel is determined by gas chromatography.

[0056] The relationship between the fuel flow Flow_cylinder_i allocated by the variable flow fuel distribution subsystem to the i-th cylinder and the load load_cylinder_i of the cylinder is:

[0057]

[0058] Assuming the coefficient k5 is 0.005 and b3 is 0.1, the following is a table of experimental results for variable flow fuel distribution:

[0059]

[0060] Injection timing adjustment amount of the fuel injection timing fine-tuning subsystem and intake air temperature T intake , Reference intake air temperature T reference , Intake pressure P intake , Reference intake pressure P reference The relationship is:

[0061]

[0062] Assume coefficient k6 is 0.05, k7 is 0.08, and b4 is -0.2;

[0063] The following is a table of experimental results of fine-tuning the fuel injection timing:

[0064]

[0065] According to different engine working modes, such as idle, medium speed, high speed, etc., the preset function f3 is used to adjust the fuel pressure. For example, in idle mode, f3 returns 5MPa; in medium speed mode, f3 returns 10MPa; in high speed mode, f3 returns 15MPa. The mode sensor monitors the engine working mode in real time and transmits the signal to the ECU, which controls the fuel pressure regulating valve to achieve adaptive adjustment of the fuel pressure.

[0066] The wireless fuel monitoring and control subsystem uses Bluetooth 5.0 technology to achieve wireless communication, and transmits key parameters of the fuel supply system, such as fuel pressure, temperature, flow, etc., to the vehicle's central control system or mobile device in real time. By developing corresponding mobile phone applications, users can remotely view the working status of the fuel system through their mobile phones and send control instructions when necessary, such as starting the preheating system and adjusting fuel injection parameters.

[0067] The fuel injection mode optimization subsystem presets multiple fuel injection modes, such as stratified lean injection, homogeneous combustion injection, and multiple sequential injections. According to the engine's operating conditions and load, the sensor obtains real-time data, such as intake volume, throttle opening, oxygen sensor signal, etc. The ECU automatically determines and switches to the optimal injection mode. The following is a table of experimental results for fuel injection mode optimization:

[0068]

[0069] The fuel recovery and reuse subsystem collects incompletely burned fuel vapor through an activated carbon adsorption tank. When the adsorption tank is saturated, the adsorbed fuel is desorbed using the engine's vacuum and sent back to the fuel tank through the return oil pipeline. Excess fuel that is still sprayed out after the injector is closed is collected through a special return oil channel and returned to the fuel system after filtering and purification.

[0070] The AI-based fuel control subsystem uses deep learning algorithms, such as convolutional neural networks (CNN), to train a large amount of experimental data. Input parameters include engine speed, load, intake temperature, pressure, etc., and the output is the optimal fuel injection amount, injection time, injection mode and other control parameters. In actual operation, the engine operation data is collected in real time and input into the trained model. The model quickly gives the optimal fuel control strategy to achieve intelligent fuel supply control.

[0071] Verification experiment:

[0072] Under the same road conditions (such as a flat highway), the same vehicle load and the same driving style, the engine equipped with the fuel supply system of the present invention and the engine equipped with the traditional fuel supply system are tested respectively. After repeated experiments for many times, the average fuel consumption data is shown in the following table:

[0073]

[0074] In a professional emission test laboratory, the two engines were tested for exhaust emissions according to the national standard test procedures to detect the content of pollutants such as carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) in the exhaust gas. The results are shown in the following table:

[0075]

[0076] On an engine dynamometer, full-load acceleration performance tests were conducted on an engine equipped with the fuel supply system of the present invention and an engine equipped with a conventional fuel supply system, and the output power and torque at different speeds were measured. The experimental results are shown in the following table:

[0077]

[0078] Combining the above verification test results of fuel economy, emission performance and power performance, it can be clearly seen that the in-cylinder dual direct injection engine fuel supply system of the present invention has significant advantages in all aspects. In terms of fuel economy, compared with traditional systems, the present invention effectively reduces fuel consumption and saves users' use costs. In terms of emission performance, the emission of pollutants is significantly reduced, which has positive significance for environmental protection. In terms of power performance, the power and torque output of the engine at different speeds are improved, and the acceleration and driving performance of the vehicle are enhanced. This fully proves the innovation and practicality of the fuel supply system of the present invention, which can effectively optimize engine performance and achieve the goal of energy saving and emission reduction.

[0079] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A fuel supply system for a dual direct injection engine, characterized in that: Including high-pressure fuel pump subsystem, low-pressure fuel pump subsystem, fuel filter subsystem, fuel rail subsystem, fuel injector subsystem, fuel pressure sensor subsystem, fuel control unit subsystem, fuel box system and fuel pipeline subsystem; The fuel tank system is connected to the low-pressure fuel pump subsystem through the fuel pipeline subsystem. The low-pressure fuel pump subsystem pressurizes the fuel and transmits it to the fuel filter subsystem through the fuel pipeline subsystem. The filtered fuel then enters the high-pressure fuel pump subsystem through the fuel pipeline subsystem. The high-pressure fuel output by the high-pressure fuel pump subsystem is distributed to the fuel injector subsystem through the fuel rail subsystem. The fuel pressure sensor subsystem is installed in the fuel rail subsystem or related pipelines, and feeds back the pressure data to the fuel control unit subsystem. The fuel control unit subsystem receives the data from each sensor and controls and adjusts the low-pressure fuel pump subsystem, the high-pressure fuel pump subsystem and the fuel injector subsystem. Among them, the relationship between the output pressure P_high and the engine speed n_engine of the high-pressure oil pump subsystem is: P_high = k1 × n_engine + b1, where k1 and b1 are preset coefficients; Injector subsystem, the relationship between the injection amount Q_inject and the high-pressure oil pump output pressure P_high and the injection time t_inject is: Q_inject = k2 × P_high × t_inject, where k2 is a preset coefficient; The fuel control unit subsystem determines the injection time t_inject according to the engine speed n_engine and load load, following the following algorithm: If(n engine <n thresh )&&(load<load thresh )Then(t inject =f1(n engine ,load))Else(t inject =f2(n engine ,load)); Among them, n_thresh and load_thresh are preset thresholds, and f1 and f2 are preset functions.

2. A fuel supply system for a dual direct injection engine as claimed in claim 1, characterized in that: The fuel supply system of the dual direct injection engine also includes an intelligent fuel preheating subsystem, which is connected to other subsystems through a fuel pipeline. The preheating temperature is adjusted according to the ambient temperature and the engine speed. The fuel control unit subsystem is connected to the circuit to receive control and feedback related information. The relationship between the preheating temperature T_preheat and the ambient temperature T_ambient and the engine speed n_engine is: T preheat =k3×T ambient +k4×n engine +b2; Among them, k3, k4, and b2 are preset coefficients.

3. A fuel supply system for a dual direct injection engine as claimed in claim 1, characterized in that: The fuel supply system of the dual direct injection engine also includes a fuel quality monitoring subsystem, which is connected to the fuel control unit subsystem through sensors and data transmission lines, and transmits the detected fuel quality data to the fuel control unit subsystem in real time, which is used to detect the water content w, impurity content c and octane number r of the fuel in real time.

4. A fuel supply system for a dual direct injection engine as claimed in claim 1, characterized in that: The fuel supply system of the dual direct injection engine also includes a variable flow fuel distribution subsystem, which is connected to the intake air temperature and pressure sensor to obtain relevant data, and is connected to the fuel control unit subsystem through a circuit to adjust the injection timing according to the changes in the intake air temperature and pressure; The relationship between the fuel flow Flow_cylinder_i allocated to the i-th cylinder and the load load_cylinder_i of the cylinder is: Flow_cylinder_i=k5×load_cylinder_i+b3, wherein k5 and b3 are preset coefficients.

5. The fuel supply system of a dual direct injection engine as claimed in claim 1, characterized in that: The fuel supply system of the dual direct injection engine in the cylinder also includes a fuel injection timing fine-tuning subsystem, which is connected to the intake temperature and pressure sensor to obtain relevant data, and is connected to the fuel control unit subsystem through a circuit to adjust the injection timing according to changes in the intake temperature and pressure. The relationship between the injection timing adjustment amount Delta_t_inject and the intake temperature T_intake, the reference intake temperature T_reference, the intake pressure P_intake, and the reference intake pressure P_reference is: Delta_t_inject=k6X(T_intake-T_reference)+k7X(P_intake-P_reference)+b4, where k6, k7, and b4 are preset coefficients.

6. A fuel supply system for a dual direct injection engine as claimed in claim 1, characterized in that: The fuel supply system of the dual direct injection engine also includes a fuel pressure adaptive adjustment subsystem, which is connected to the fuel control unit subsystem through a circuit. The fuel pressure is adjusted by the fuel control unit subsystem according to the engine operating mode. The fuel pressure P_adjust is adjusted according to the engine operating mode mode_engine, following: P_adjust = f3 (mode_engine), where f3 is a preset function.

7. A fuel supply system for a dual direct injection engine as claimed in claim 1, characterized in that: The fuel supply system of the dual direct injection engine also includes a wireless fuel monitoring and control subsystem, which performs data exchange and control command transmission with the fuel control unit subsystem through wireless communication.

8. The fuel supply system of a dual direct injection engine as claimed in claim 1, characterized in that: The fuel supply system of the dual direct injection engine also includes a fuel injection mode optimization subsystem, which is connected to the fuel control unit subsystem, and the fuel control unit subsystem performs optimization control according to the engine operating state.

9. A fuel supply system for a dual direct injection engine as claimed in claim 1, characterized in that: The fuel supply system of the dual direct injection engine also includes a fuel recovery and reuse subsystem, which is connected to other subsystems through a fuel pipeline and may be connected to a fuel control unit subsystem through a circuit to coordinate work.

10. The fuel supply system of a dual direct injection engine as claimed in claim 1, characterized in that: The fuel supply system of the dual direct injection engine also includes an artificial intelligence-based fuel control subsystem, which is integrated with the fuel control unit subsystem or works in coordination through data interaction to achieve more intelligent fuel control.

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