Control method of dual direct injection fuel supply system, electronic device, dual direct injection fuel supply system, and vehicle
By real-time correction of methanol and diesel injection quantities and utilizing the engine's target operating conditions and detection information, the problem of methanol injection quantity deviation in the dual direct injection fuel supply system was solved, achieving precise control and improving the system's reliability and power.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHEJIANG GEELY HLDG GRP CO LTD
- Filing Date
- 2026-04-01
- Publication Date
- 2026-06-12
AI Technical Summary
In existing dual direct injection fuel supply systems, it is difficult to precisely match the methanol injection quantity with demand power, resulting in large injection quantity deviations and significant output fluctuations, which affect the system's reliability, power, and responsiveness.
By acquiring the engine's target operating conditions and detection information, and utilizing pre-built injection correction coefficient relationships, the methanol and diesel injection quantities are corrected in real time, including parameters such as temperature, humidity, oxygen concentration, and methanol concentration, thereby achieving precise control of the methanol injection quantity.
It improves the reliability, power, and responsiveness of the dual direct injection fuel supply system, ensures the accuracy of methanol injection, and enhances engine operating stability and fuel economy.
Smart Images
Figure CN122190933A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of engine control technology, specifically to a control method, electronic equipment, dual direct injection fuel supply system, and vehicle for a dual direct injection fuel supply system. Background Technology
[0002] With the continuous development of new energy vehicle technology, dual direct injection fuel supply systems are becoming increasingly widely used due to their advantages in fuel selection flexibility and high energy conversion efficiency.
[0003] However, current methods for controlling the methanol injection quantity in dual direct injection fuel supply systems make it difficult to accurately match the injection quantity with demand power. This results in problems such as large deviations in methanol injection quantity and significant output fluctuations in dual direct injection fuel supply systems, which in turn affect the reliability, power, and responsiveness of the dual direct injection fuel supply systems. Summary of the Invention
[0004] In view of this, this application aims to provide a control method, electronic equipment, dual direct injection fuel supply system and vehicle for a dual direct injection fuel supply system, which can achieve precise control of the target methanol injection quantity and improve the reliability, power and responsiveness of the dual direct injection fuel supply system.
[0005] The first aspect of this application provides a control method for a dual direct injection fuel supply system, applied to a vehicle's dual direct injection fuel supply system, the dual direct injection fuel supply system including a methanol injector; the method includes: The target operating conditions and target detection information of the vehicle are obtained; the target detection information includes the temperature and humidity of the engine intake, the oxygen concentration of the engine exhaust, and the methanol concentration and methanol temperature in the methanol tank of the dual direct injection fuel supply system. Based on the pre-built correspondence between operating conditions and detection information and the first injection correction coefficient, the first injection correction coefficient corresponding to the target operating condition and the target detection information is determined as the first target correction coefficient; Based on the first target correction coefficient, the base methanol injection quantity in the dual direct injection fuel supply system is corrected to obtain the target methanol injection quantity, and the methanol injector is controlled to operate based on the target methanol injection quantity.
[0006] Optionally, the hydraulic medium for the methanol injector includes high-pressure diesel fuel; The step of controlling the methanol injector to operate based on the target methanol injection quantity includes: The methanol injection control valve of the methanol injector is opened to allow the high-pressure diesel fuel to enter the hydraulic chamber of the methanol injector, driving the methanol injector to inject until the injection quantity of the methanol injector meets the target methanol injection quantity.
[0007] Optionally, it also includes: Acquire target monitoring information; the target monitoring information includes: the engine's water temperature and external atmospheric pressure; Based on the pre-built correspondence between operating conditions and monitoring information and the second injection correction coefficient, the second injection correction coefficient corresponding to the target operating condition and the target monitoring information is determined as the second target correction coefficient; The step of correcting the base methanol injection quantity in the dual direct injection fuel supply system based on the first target correction coefficient to obtain the target methanol injection quantity includes: Based on the first target correction coefficient and the second target correction coefficient, the base methanol injection quantity in the dual direct injection fuel supply system is corrected to obtain the target methanol injection quantity.
[0008] Optionally, the dual direct injection fuel supply system further includes diesel injectors; After acquiring the target monitoring information, the method further includes: Based on the pre-built correspondence between operating conditions and monitoring information and diesel injection correction coefficients, the diesel injection correction coefficients corresponding to the target operating conditions and the target monitoring information are determined as the third target correction coefficients. The base diesel injection quantity in the dual direct injection fuel supply system is corrected based on the third target correction coefficient to obtain the target diesel injection quantity, and the diesel injector is controlled to operate based on the target diesel injection quantity.
[0009] Optionally, the target operating condition includes the engine's target required torque and current operating speed; the method further includes: Determine the current load of the vehicle; Based on the pre-built correspondence between vehicle load and operating conditions and diesel torque distribution coefficient, the target diesel torque distribution coefficient is determined to be the current load of the vehicle and the diesel torque distribution coefficient corresponding to the target operating conditions. The target methanol torque distribution coefficient is determined based on the target diesel torque distribution coefficient. Based on the target torque demand, the target diesel torque allocation coefficient, and the target methanol torque allocation coefficient, determine the current methanol allocation torque demand and the current diesel allocation torque demand. Based on the pre-established correspondence between operating speed and methanol allocation torque and methanol injection quantity, the methanol injection quantity corresponding to the current operating speed and the current methanol allocation torque is determined as the methanol base injection quantity; and based on the pre-established correspondence between operating speed and diesel allocation torque and diesel injection quantity, the diesel injection quantity corresponding to the current operating speed and the current diesel allocation torque is determined as the diesel base injection quantity.
[0010] Optionally, the dual direct injection fuel supply system further includes a temperature and humidity sensor, a methanol temperature and quality sensor, and a nitrogen and oxygen sensor; The acquisition of the target detection information of the vehicle includes: The temperature and humidity of the engine intake are obtained through the temperature and humidity sensor, the oxygen concentration of the engine exhaust is obtained through the nitrogen-oxygen sensor, and the methanol concentration and temperature in the methanol tank of the dual direct injection fuel supply system are obtained through the methanol temperature and quality sensor.
[0011] A second aspect of this application provides an electronic device, comprising: A processor, and a memory connected to the processor; The memory is used to store computer programs; The processor is used to call and execute the computer program in the memory to perform the control method of the dual direct injection fuel supply system as described in the first aspect of this application.
[0012] A third aspect of this application provides a dual direct injection fuel supply system, including a methanol injector and electronic equipment as described in the second aspect of this application.
[0013] Optionally, it also includes: a methanol tank, a temperature and humidity sensor, a methanol temperature quality sensor, and a nitrogen and oxygen sensor; The temperature and humidity sensor is located at the engine's air intake and is used to provide the temperature and humidity of the engine's air intake. The nitrogen oxide sensor is located at the exhaust port of the engine and is used to provide the oxygen concentration at the engine exhaust port. The methanol temperature and quality sensor is installed inside the methanol tank to provide the methanol concentration and temperature inside the methanol tank.
[0014] A fourth aspect of this application provides a vehicle including a dual direct injection fuel supply system as described in the third aspect of this application.
[0015] In this application, the control method for a dual direct injection fuel supply system can be applied to a vehicle's dual direct injection fuel supply system, which includes a methanol injector. The control method includes: acquiring the vehicle's target operating conditions and target detection information; the target detection information includes the temperature and humidity at the engine intake, the oxygen concentration at the engine exhaust, and the methanol concentration and temperature in the methanol tank of the dual direct injection fuel supply system; determining the first injection correction coefficient corresponding to the target operating conditions and target detection information as a first target correction coefficient based on a pre-built correspondence between the operating conditions and detection information and a first injection correction coefficient; correcting the basic methanol injection quantity in the dual direct injection fuel supply system based on the first target correction coefficient to obtain the target methanol injection quantity, and controlling the methanol injector to operate based on the target methanol injection quantity. In this way, based on the real-time acquisition of the engine intake temperature and humidity, the engine exhaust oxygen concentration, and the methanol concentration and temperature in the methanol tank, the methanol base injection quantity can be corrected online in real time from multiple independent key interference sources such as intake, combustion, and fuel. This effectively improves the accuracy of the target methanol injection quantity, that is, it achieves precise control of the target methanol injection quantity, and improves the reliability, power, and responsiveness of the dual direct injection fuel supply system. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of a dual direct injection fuel supply system provided in one embodiment of this application.
[0018] Figure 2 This is a schematic flowchart of a control method for a dual direct injection fuel supply system provided in one embodiment of this application.
[0019] Figure 3 This is a schematic diagram of the structure of a control device for a dual direct injection fuel supply system provided in one embodiment of this application.
[0020] Figure 4 This is a schematic diagram of the structure of an electronic device provided in one embodiment of this application. Detailed Implementation
[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0022] In the field of dual-fuel engine control technology, precise control of engine output torque is the core objective to ensure its power performance, fuel economy, and operational stability, and it is also a key technological direction that the industry has long been committed to optimizing. To achieve this goal, the commonly used control scheme in existing technologies is to use the engine's required torque as the core input parameter, and rely on the torque-fuel injection quantity mapping relationship obtained through pre-calibration experiments to directly determine the basic fuel injection quantity, thereby completing the regulation of engine torque. This conventional control scheme does not require real-time calculation of the engine's complex combustion mechanism, simplifies the control logic, achieves rapid response in torque control, and at the same time, meets the control accuracy requirements of actual operation, stably achieving precise regulation of engine torque and ensuring the normal operation of the engine.
[0023] However, through in-depth analysis, the inventors discovered that when the aforementioned conventional control scheme is applied to the specific application scenario of a dual direct injection engine, its control effect is not ideal, failing to meet the torque control requirements of this type of engine, and even causing a series of operational problems. The root cause of this problem lies in the fact that conventional control schemes, in order to optimize their control stability and response speed, inherently have significant limitations in their design, inevitably sacrificing control adaptability and precision, thus leading to fluctuations in engine power output and affecting the engine's operating performance and reliability.
[0024] Specifically, during the operation of a methanol-diesel dual direct injection engine, especially under methanol blending conditions, the combustion characteristics of methanol fuel are highly sensitive. Its combustion efficiency and energy release are easily affected by various external and internal parameters, including intake air temperature and humidity, the characteristics of methanol fuel itself, and the air-fuel ratio of the in-cylinder mixture. Even slight changes in these parameters can lead to significant differences in the actual effective torque generated by the engine under the same base injection quantity, thereby disrupting the rationality of the preset torque-fuel injection quantity mapping relationship in conventional control schemes.
[0025] For example, in high humidity environments, the moisture in the air inhibits the complete combustion of methanol fuel. In this case, the base injection quantity of methanol, determined according to the preset torque-methanol injection quantity mapping relationship in the conventional control scheme, often fails to produce the expected effective torque, resulting in problems such as insufficient engine power and sluggish acceleration. Under conditions where the methanol fuel temperature is high, the volatility of methanol increases and the combustion rate accelerates. The same base injection quantity will cause excessive release of combustion energy in the cylinder, resulting in torque output exceeding the expected value, producing phenomena such as engine shock and vibration, and affecting the smoothness of the vehicle's ride.
[0026] Traditional control schemes employ a feedforward control model based on a single torque-fuel injection quantity mapping relationship. This model can only query the preset injection quantity based on the required torque, failing to detect other complex and variable disturbance variables in real time, and unable to compensate for torque deviations caused by these disturbances in a timely and effective manner. This results in an unpredictable deviation between the engine's actual output torque and the required torque. This not only fails to meet the torque control precision requirements of methanol-diesel dual direct injection engines but also affects the engine's fuel economy, emissions performance, and operational stability, limiting the widespread application of methanol-diesel dual direct injection engines.
[0027] Therefore, improving the precise control of fuel injection quantity by the dual direct injection fuel supply system in the engine, thereby improving the reliability, power and responsiveness of the dual direct injection fuel supply system, is an urgent technical problem to be solved.
[0028] Therefore, embodiments of this application provide a control method for a dual direct injection fuel supply system, which can be applied to a vehicle's dual direct injection fuel supply system.
[0029] Specifically, such as Figure 1 As shown, the dual direct injection fuel supply system, as a subsystem of the engine, can include at least a diesel tank 1, a methanol tank 2, a high-pressure fuel pump 3, a diesel metering unit 4, a methanol metering unit 5, a methanol rail pressure sensor 6, a diesel rail pressure sensor 7, an engine control unit (ECM) 8, a temperature and humidity sensor 9, a nitrogen oxide sensor 10, a methanol pressure control valve 11, a high-pressure fuel rail 12, a diesel pressure relief valve 13, a high-pressure fuel line adapter 14, a diesel injection control valve 15, a methanol injection control valve 16, a methanol temperature and quality sensor 17, a diesel injector 18, and a methanol injector 19.
[0030] In this process, diesel and methanol fuels are pressurized from diesel tank 1 and methanol tank 2 by high-pressure oil pump 3 and pumped to diesel high-pressure chamber and methanol high-pressure chamber in high-pressure oil rail 12, respectively. The high-pressure diesel in diesel high-pressure chamber is connected to diesel injector 18 and methanol injector 19 by high-pressure oil pipe through high-pressure oil pipe adapter 14. The high-pressure methanol in methanol high-pressure chamber is connected to methanol injector 19 by high-pressure oil pipe.
[0031] Diesel fuel from diesel injector 18, methanol injector 19, high-pressure oil pump 3, high-pressure oil rail 12, and diesel pressure relief valve 13 flows back to diesel tank 1 during return oil operation; methanol fuel from methanol pressure control valve (PCV) 11 on high-pressure oil pump 3 and high-pressure oil rail 12 flows back to methanol tank 2 during return oil operation.
[0032] The diesel metering unit 4 and methanol metering unit 5 installed on the high-pressure oil pump 3, the diesel rail pressure sensor 7, methanol rail pressure sensor 6 and methanol pressure control valve 11 installed on the high-pressure oil rail 12, the diesel injection control valve 15 installed on the diesel injector 18, the methanol injection control valve 16 installed on the methanol injector 19, the temperature and humidity sensor 9 installed at the engine air intake, the nitrogen and oxygen sensor 10 installed at the engine exhaust port, and the methanol temperature and quality sensor 17 installed in the methanol tank 2 are all connected to the ECM8 by a wiring harness.
[0033] In practice, the temperature and humidity sensor 9 at the engine intake can be used to provide the temperature and humidity of the engine intake; the nitrogen and oxygen sensor 10 at the engine exhaust can be used to provide the oxygen concentration of the engine exhaust; and the methanol temperature and quality sensor 17 in the methanol tank 2 can be used to provide the methanol concentration and methanol temperature in the methanol tank 2.
[0034] Specifically, taking the execution on the ECM side as an example, such as Figure 2 As shown, the control method for a dual direct injection fuel supply system may include at least the following steps: S201. Obtain the target operating conditions and target detection information of the vehicle; the target detection information includes the temperature and humidity of the engine intake, the oxygen concentration of the engine exhaust, and the methanol concentration and temperature in the methanol tank of the dual direct injection fuel supply system.
[0035] Obtaining the target operating conditions and target detection information of the vehicle is a prerequisite for subsequent correction of methanol injection quantity, laying the foundation for precise control of methanol injection quantity.
[0036] The target operating condition reflects the vehicle's operating status, specifically including the target torque requirement and target operating speed, which determine the basic fuel supply requirements. Among the target detection information, the oxygen concentration at the engine exhaust port, and the methanol concentration and temperature in the methanol tank of the dual direct injection fuel supply system, provide key environmental and fuel state variables affecting methanol combustion efficiency.
[0037] Oxygen concentration refers to the volume percentage or partial pressure of oxygen in exhaust gas, and it is a key parameter for calculating the actual air-fuel ratio. It can refer to the oxygen concentration directly measured by a nitrogen-oxygen sensor, or it can encompass the excess air coefficient λ measured by a wide-range oxygen sensor. For example, the oxygen concentration at the engine exhaust port can be measured by a nitrogen-oxygen sensor installed on the exhaust pipe. This signal directly reflects the completeness of combustion of the air-fuel mixture in the cylinder and is an important basis for correcting methanol injection quantity.
[0038] In practice, target detection information can be obtained through specific sensors pre-set in the dual direct injection fuel supply system. For example, such as... Figure 1 As shown, the temperature and humidity at the engine intake can be obtained through temperature and humidity sensor 9, the oxygen concentration at the engine exhaust can be obtained through nitrogen and oxygen sensor 10, and the methanol concentration and temperature in the methanol tank can be obtained through methanol temperature and quality sensor 17. Using this method, high-precision raw physical parameters can be obtained directly and reliably, laying a data foundation for accurate correction.
[0039] Of course, target detection information can be obtained in various ways, not limited to the aforementioned method of directly acquiring it using specific preset sensors. For example, it can be indirectly calculated through a combination of sensors (such as estimating humidity by combining intake pressure and temperature with a model), received from other control units via the vehicle network, or obtained by fitting and predicting historical data through online learning algorithms. All of these solutions can provide the correction model with multi-dimensional input information reflecting the intake, fuel, and combustion states.
[0040] S202. Based on the pre-built correspondence between operating conditions and detection information and the first injection correction coefficient, the first injection correction coefficient corresponding to the target operating conditions and target detection information is determined as the first target correction coefficient.
[0041] In implementation, the correspondence between operating conditions and detection information and the first injection correction coefficient can be one or more pre-constructed multidimensional data tables. For example, when the correspondence between operating conditions and detection information and the first injection correction coefficient is a multidimensional data table, the corresponding first injection correction coefficient can be directly found from the multidimensional data table using the operating conditions and detection information as an index. Alternatively, when the correspondence between operating conditions and detection information and the first injection correction coefficient is multiple multidimensional data tables, it can include a table showing the correspondence between operating conditions—engine intake temperature and humidity and the first correction coefficient; an table showing the correspondence between operating conditions—engine exhaust oxygen concentration and the second correction coefficient; and a table showing the correspondence between operating conditions—methanol concentration and methanol temperature in the methanol tank of the dual direct injection fuel supply system and the third correction coefficient. Based on these three multidimensional data tables, the first, second, and third correction coefficients corresponding to the target operating conditions and target detection information can be determined respectively. The product of these three correction coefficients is also the first injection correction coefficient corresponding to the target operating conditions and target detection information.
[0042] In this way, the first target correction coefficient can be quickly determined, thereby improving the real-time performance and efficiency of the correction. At the same time, it also facilitates calibration on the engine test bench.
[0043] S203. Based on the first target correction coefficient, the basic methanol injection quantity in the dual direct injection fuel supply system is corrected to obtain the target methanol injection quantity, and the methanol injector is controlled to work based on the target methanol injection quantity.
[0044] By using a comprehensive first-target correction coefficient to adjust the methanol base injection quantity, the final injection command sent to the methanol injector can pre-compensate for torque deviations caused by changes in intake, combustion, and fuel state, thereby achieving precise control of the methanol injector.
[0045] In practice, after determining the base methanol injection quantity in the dual direct injection fuel supply system, the base methanol injection quantity can be multiplied by the first target correction coefficient to obtain the target methanol injection quantity.
[0046] In this embodiment, the control method for the dual direct injection fuel supply system can be applied to a vehicle's dual direct injection fuel supply system, which includes a methanol injector. The control method includes: acquiring the vehicle's target operating conditions and target detection information; the target detection information includes the temperature and humidity of the engine intake, the oxygen concentration of the engine exhaust, and the methanol concentration and temperature in the methanol tank of the dual direct injection fuel supply system; based on the pre-built correspondence between the operating conditions and detection information and the first injection correction coefficient, determining the first injection correction coefficient corresponding to the target operating conditions and target detection information as the first target correction coefficient; based on the first target correction coefficient, correcting the basic methanol injection quantity in the dual direct injection fuel supply system to obtain the target methanol injection quantity, and controlling the methanol injector to operate based on the target methanol injection quantity. In this way, based on the real-time acquisition of the engine intake temperature and humidity, the engine exhaust oxygen concentration, and the methanol concentration and temperature in the methanol tank, the methanol base injection quantity can be corrected online in real time from multiple independent key interference sources such as intake, combustion, and fuel. This effectively improves the accuracy of the target methanol injection quantity, that is, it achieves precise control of the target methanol injection quantity, and improves the reliability, power, and responsiveness of the dual direct injection fuel supply system.
[0047] To further optimize the operational reliability of the methanol injector, in some embodiments, the hydraulic medium of the methanol injector may include high-pressure diesel fuel.
[0048] Accordingly, when controlling the operation of the methanol injector based on the target methanol injection quantity, such as Figure 1 As shown, the methanol injection control valve 16 of the methanol injector 19 can be opened to allow high-pressure diesel fuel to enter the hydraulic chamber of the methanol injector 19, driving the methanol injector 19 to inject until the injection quantity of the methanol injector 19 meets the target methanol injection quantity.
[0049] During implementation, the methanol injector uses the existing high-pressure diesel fuel in the dual direct injection fuel supply system as its hydraulic drive medium. That is, it reuses the pressure source of the existing diesel fuel supply route, eliminating the need to introduce an additional dedicated hydraulic circuit. This simplifies the system structure and utilizes the lubricity of diesel fuel itself to solve the problem of actuator wear caused by the poor lubricity of methanol fuel. This ensures that the methanol injector maintains the accuracy and reliability of its operation during long-term operation and avoids secondary impacts on injection control accuracy due to the performance degradation of the actuator.
[0050] Specifically, when methanol injection is required, an opening command is sent to the injection control valve on the methanol injector. High-pressure diesel fuel rapidly flows into the hydraulic chamber of the methanol injector under the pressure difference, pushing the internal piston or needle valve. This movement first closes the methanol return passage, then overcomes the methanol pressure to open the needle valve of the methanol nozzle, allowing high-pressure methanol to be injected into the engine cylinder. Throughout the injection process, the diesel pressure in the hydraulic chamber continuously acts on the drive components until the injection volume reaches the target methanol injection volume. At this point, the control valve closes, the diesel pressure is released, the needle valve resets under spring pressure, and the methanol injection ends.
[0051] The driving process of the methanol injector is independent of the physical characteristics of methanol fuel. It is driven by stable high-pressure diesel. On the one hand, high-pressure diesel has good lubricity, which can lubricate moving parts such as injection control valve and needle valve, effectively avoiding cavitation and wear caused by poor methanol lubricity, thus improving the durability and reliability of the methanol injector. On the other hand, the diesel pressure is usually high and stable, which can provide sufficient and constant driving force for methanol injection, ensuring the stability of the injection rate. This is an important basis for achieving precise injection volume.
[0052] In practice, the hydraulic drive path of the methanol injector can be as follows: High-pressure diesel fuel flows out from the high-pressure oil rail of the methanol-diesel dual-fuel system, passes through a high-pressure oil pipe adapter and a dedicated oil pipe, and connects to the diesel inlet of the methanol injector. The methanol injection control valve is integrated into the methanol injector and opens when energized, allowing high-pressure diesel fuel to enter the hydraulic chamber.
[0053] Furthermore, using diesel as the hydraulic medium has an additional benefit: a small amount of diesel that seeps into the hydraulic chamber and may mix slightly with methanol may eventually be injected into the cylinder along with the methanol to participate in combustion, without causing pollution or waste.
[0054] In practical applications, the pressure of the diesel fuel used for propulsion can be maintained at a stable level higher than the methanol pressure, for example, by 200 bar. This not only ensures the effectiveness of the driving force but also allows the diesel fuel to continuously penetrate into the methanol injector, forming a continuous lubricating film.
[0055] In some embodiments, the control method for the dual direct injection fuel supply system may further include: acquiring target monitoring information; the target monitoring information may include: engine water temperature and external atmospheric pressure; and determining the second injection correction coefficient corresponding to the target operating condition and target monitoring information as the second target correction coefficient based on a pre-built correspondence between operating conditions and monitoring information and the second injection correction coefficient.
[0056] Accordingly, when correcting the base methanol injection quantity in the dual direct injection fuel supply system based on the first target correction coefficient to obtain the target methanol injection quantity, it can specifically include: correcting the base methanol injection quantity in the dual direct injection fuel supply system based on the first target correction coefficient and the second target correction coefficient to obtain the target methanol injection quantity.
[0057] Engine coolant temperature can be obtained through a coolant temperature sensor installed on the engine block or radiator circuit, while external atmospheric pressure can be obtained through an atmospheric pressure sensor installed in the engine compartment or outside the vehicle body.
[0058] Building upon the initial corrections targeting intake, combustion, and fuel conditions, a second round of corrections based on engine coolant temperature and external atmospheric pressure is introduced. This compensates for parameters that, while changing relatively slowly, significantly impact all fundamental fuel combustion conditions, thus making the correction system more comprehensive. Engine coolant temperature directly affects the intake port temperature and cylinder wall temperature, thereby influencing fuel atomization and combustion speed; external atmospheric pressure directly affects the intake oxygen content, especially at high altitudes. Incorporating engine coolant temperature and external atmospheric pressure into the correction system significantly expands the applicable geographical and operating conditions of the dual direct injection fuel supply system control method.
[0059] In this embodiment, a two-level correction architecture is constructed: the first-level correction (first target correction coefficient) focuses on addressing the sensitivity of methanol combustion to specific variables, offering fast response and strong targeting. The second-level correction (second target correction coefficient) handles global variables affecting the basic combustion environment. The two correction coefficients can act together on the base methanol injection quantity in a series multiplicative manner, i.e.: target methanol injection quantity = base methanol injection quantity × first target correction coefficient × second target correction coefficient. Its advantage lies in decoupling correction factors with different response characteristics and influencing mechanisms, making the calibration process clearer and the system more robust.
[0060] It should be noted that in practical applications, the correspondence between operating conditions, detection information, monitoring information and correction coefficients can be established in advance. In this way, after obtaining the target operating conditions, target detection information and target monitoring information, the target correction coefficient (which is equivalent to the product of the first target correction coefficient and the second target correction coefficient) can be obtained directly by looking up the table once based on the correspondence between operating conditions, detection information, monitoring information and correction coefficients.
[0061] In order to achieve overall coordinated and precise control of the dual direct injection fuel supply system, in some embodiments, the dual direct injection fuel supply system may also include a diesel injector, that is, the dual direct injection fuel supply system may be a methanol-diesel dual direct injection fuel supply system.
[0062] Accordingly, after acquiring the target monitoring information, the control method of the dual direct injection fuel supply system may also include: determining the diesel injection correction coefficient corresponding to the target operating condition and target monitoring information as the third target correction coefficient based on the pre-constructed correspondence between the operating condition and monitoring information and the diesel injection correction coefficient; correcting the basic diesel injection quantity in the dual direct injection fuel supply system based on the third target correction coefficient to obtain the target diesel injection quantity; and controlling the diesel injector to work based on the target diesel injection quantity.
[0063] The introduction of the diesel injection correction factor (third target correction factor) allows the diesel injection quantity to be adaptively adjusted according to the basic operating environment such as engine water temperature and atmospheric pressure.
[0064] During implementation, after determining the third target correction factor, multiplying it by the determined third target correction factor yields the final target diesel injection quantity. Through coordinated environmental compensation of the injection quantities of the two fuels (diesel and methanol), it can be ensured that the total torque generated by the dual-fuel combination combustion can accurately follow the required torque under various environments, and potentially achieve a smoother torque transition and lower emissions.
[0065] It should be noted that diesel injection quantity correction can exist independently of methanol correction logic, or it can share some input parameters and calculation modules with methanol correction. For example, a unified "fuel characteristic-environment" compensation model can be designed, whose output is allocated according to the current dominant fuel or fuel ratio.
[0066] To define the base injection quantities for each of the two fuels from the total demand torque, in some implementations, the target operating condition may include the engine's target demand torque and current operating speed.
[0067] Correspondingly, the control method for the dual direct injection fuel supply system may further include: determining the vehicle's current load; determining the target diesel torque distribution coefficient based on a pre-built correspondence between the vehicle's load and operating conditions and the diesel torque distribution coefficient; determining the target methanol torque distribution coefficient based on the target diesel torque distribution coefficient; determining the current methanol distribution demand torque and the current diesel distribution demand torque based on the target demand torque, the target diesel torque distribution coefficient, and the target methanol torque distribution coefficient; determining the methanol injection quantity corresponding to the current operating speed and the current methanol distribution demand torque based on a pre-built correspondence between the operating speed and the methanol distribution demand torque and the methanol injection quantity; and determining the diesel injection quantity corresponding to the current operating speed and the current diesel distribution demand torque based on a pre-built correspondence between the operating speed and the diesel distribution demand torque and the diesel injection quantity.
[0068] During implementation, the correspondence between the vehicle's load and operating conditions and the diesel torque distribution coefficient can be pre-calibrated to obtain the diesel torque distribution coefficient MAP; the correspondence between the operating speed and the methanol distribution torque demand and the methanol injection quantity can be pre-calibrated to obtain the methanol injection quantity MAP; and the correspondence between the operating speed and the diesel distribution torque demand and the diesel injection quantity can be pre-calibrated to obtain the diesel injection quantity MAP.
[0069] The vehicle's current load (e.g., percentage) is determined by signals such as the accelerator pedal and vehicle speed. Then, using the current load and target operating conditions (e.g., target torque demand and current operating speed) as an index, the preset diesel torque distribution coefficient MAP is consulted to obtain the target diesel torque distribution coefficient (K_d). The target methanol torque distribution coefficient (K_m) can be obtained using K_m = 1 - K_d. After determining the target diesel torque distribution coefficient (K_d) and the target methanol torque distribution coefficient (K_m), the respective distribution torque demand for each fuel can be determined. The current diesel distribution torque demand = target torque demand × K_d, and the current methanol distribution torque demand = target torque demand × K_m. Finally, the respective distribution torque demand for each fuel, combined with the current operating speed, is converted into the initial, unadjusted methanol and diesel base injection quantities using the methanol injection quantity MAP and diesel injection quantity MAP. This decouples the total torque demand into two independent fuel demand paths, creating conditions for subsequent independent multivariate adjustments, resulting in a clear control structure and the ability to flexibly implement strategies with different blending ratios.
[0070] In practical applications, when calibrating the diesel torque distribution coefficient (MAP), if the vehicle load (engine load) is less than 20%, i.e., in the low-load region, the diesel torque distribution coefficient can be set to 5% to ensure stability under conditions such as cold start and idling. If the vehicle load is greater than or equal to 20%, i.e., in the medium-high load region, the diesel torque distribution coefficient can be in the range of 0.8% to 1%. In this case, methanol provides the majority of the torque, while diesel mainly serves for ignition and lubrication. This ensures both reliability under low loads and leverages the economic advantages of methanol under high loads.
[0071] It should be understood that the torque distribution provided in the embodiments of this application and the subsequent independent correction steps are logically sequential and coordinated, together forming a complete closed loop from "total demand" to "precise dual-fuel execution".
[0072] As another optional implementation of the disclosure in this application, embodiments of this application also provide a control device for a dual direct injection fuel supply system. This control device can be applied to a vehicle's dual direct injection fuel supply system, which may include a methanol injector. Specifically, as... Figure 3As shown, the control device for the dual direct injection fuel supply system may include: an acquisition module 301, used to acquire the target operating conditions and target detection information of the vehicle; the target detection information includes the temperature and humidity of the engine intake, the oxygen concentration of the engine exhaust, and the methanol concentration and temperature in the methanol tank of the dual direct injection fuel supply system; a determination module 302, used to determine the first injection correction coefficient corresponding to the target operating conditions and target detection information as the first target correction coefficient based on the pre-built correspondence between the operating conditions and detection information and the first injection correction coefficient; and a correction and control module 303, used to correct the basic methanol injection quantity in the dual direct injection fuel supply system based on the first target correction coefficient to obtain the target methanol injection quantity, and control the methanol injector to work based on the target methanol injection quantity.
[0073] Optionally, the hydraulic medium of the methanol injector may include high-pressure diesel fuel; correspondingly, when controlling the operation of the methanol injector based on the target methanol injection quantity, the correction and control module 303 may be used to: control the methanol injection control valve of the methanol injector to open, so that high-pressure diesel fuel enters the hydraulic chamber of the methanol injector, driving the methanol injector to inject, until the injection quantity of the methanol injector meets the target methanol injection quantity.
[0074] Optionally, the acquisition module 301 can also be used to: acquire target monitoring information; the target monitoring information includes: engine water temperature and external atmospheric pressure; the determination module 302 can also be used to: determine the second injection correction coefficient corresponding to the target operating condition and target monitoring information as the second target correction coefficient based on the pre-built correspondence between the operating condition and monitoring information and the second injection correction coefficient; correspondingly, when the methanol base injection quantity in the dual direct injection fuel supply system is corrected based on the first target correction coefficient to obtain the target methanol injection quantity, the correction and control module 303 can specifically be used to: correct the methanol base injection quantity in the dual direct injection fuel supply system based on the first target correction coefficient and the second target correction coefficient to obtain the target methanol injection quantity.
[0075] Optionally, the dual direct injection fuel supply system may also include diesel injectors; after acquiring the target monitoring information, the correction and control module 303 may also be used to: determine the diesel injection correction coefficient corresponding to the target operating condition and target monitoring information as the third target correction coefficient based on the pre-built correspondence between the operating condition and monitoring information and the diesel injection correction coefficient; correct the basic diesel injection quantity in the dual direct injection fuel supply system based on the third target correction coefficient to obtain the target diesel injection quantity, and control the diesel injector to work based on the target diesel injection quantity.
[0076] Optionally, the target operating condition may include the engine's target torque requirement and current operating speed; the acquisition module 301 may also be used to: determine the vehicle's current load; based on a pre-built correspondence between the vehicle's load and operating condition and the diesel torque distribution coefficient, determine the diesel torque distribution coefficient corresponding to the vehicle's current load and the target operating condition as the target diesel torque distribution coefficient; determine the target methanol torque distribution coefficient based on the target diesel torque distribution coefficient; determine the current methanol distribution torque requirement and the current diesel distribution torque requirement based on the target torque requirement, the target diesel torque distribution coefficient, and the target methanol torque distribution coefficient; determine the methanol injection quantity corresponding to the current operating speed and the current methanol distribution torque requirement as the methanol base injection quantity based on a pre-built correspondence between the operating speed and the methanol distribution torque requirement and the methanol injection quantity; and determine the diesel injection quantity corresponding to the current operating speed and the current diesel distribution torque requirement as the diesel base injection quantity based on a pre-built correspondence between the operating speed and the diesel distribution torque requirement and the diesel injection quantity.
[0077] Optionally, the dual direct injection fuel supply system also includes a temperature and humidity sensor, a methanol temperature and quality sensor, and a nitrogen oxide sensor; correspondingly, when acquiring target detection information of the vehicle, the acquisition module 301 can be used to: acquire the temperature and humidity of the engine intake through the temperature and humidity sensor, acquire the oxygen concentration of the engine exhaust through the nitrogen oxide sensor, and acquire the methanol concentration and methanol temperature in the methanol tank of the dual direct injection fuel supply system through the methanol temperature and quality sensor.
[0078] Specifically, the specific limitations of the control device for the dual direct injection fuel supply system can be found in the limitations of the control method for the dual direct injection fuel supply system mentioned above, and will not be repeated here. Each module in the control device of the aforementioned dual direct injection fuel supply system can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.
[0079] As another optional implementation of the disclosure of this application, embodiments of this application also provide an electronic device, such as... Figure 4 As shown, the electronic device may include: a memory 401 and a processor 402; wherein, the memory 401 is connected to the processor 402 and is used to store programs; the processor 402 is used to implement the control method of the dual direct injection fuel supply system disclosed in any of the above embodiments by running the programs stored in the memory 401.
[0080] Specifically, the aforementioned electronic device may also include: a bus, a communication interface 403, an input device 404, and an output device 405.
[0081] The processor 402, memory 401, communication interface 403, input device 404, and output device 405 are interconnected via a bus. Among them: A bus can include a pathway for transmitting information between various components of a computer system.
[0082] Processor 402 can be a general-purpose processor, such as a general-purpose central processing unit (CPU), a microprocessor, etc., or an application-specific integrated circuit (ASIC), or one or more integrated circuits used to control the execution of the program of the present application. It can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.
[0083] Processor 402 may include a main processor, as well as a baseband chip, modem, etc.
[0084] The memory 401 stores a program for executing the technical solution of this application, and may also store an operating system and other key business functions. Specifically, the program may include program code, which includes computer operation instructions. More specifically, the memory 401 may include read-only memory (ROM), other types of static storage devices capable of storing static information and instructions, random access memory (RAM), other types of dynamic storage devices capable of storing information and instructions, disk storage, flash memory, etc.
[0085] Input device 404 may include a device for receiving user input data and information, such as a keyboard, mouse, camera, scanner, light pen, voice input device, touch screen, pedometer, or gravity sensor.
[0086] Output device 405 may include devices that allow information to be output to a user, such as a display screen, printer, speaker, etc.
[0087] Communication interface 403 may include a device that uses any transceiver to communicate with other devices or communication networks, such as Ethernet, Radio Access Network (RAN), Wireless Local Area Network (WLAN), etc.
[0088] The processor 402 executes the program stored in the memory 401 and calls other devices, which can be used to implement the various steps of the control method of the dual direct injection fuel supply system provided in the above embodiments of this application.
[0089] As another optional implementation of the disclosure of this application, embodiments of this application also provide a dual direct injection fuel supply system, which may include a methanol injector and electronic equipment as described in any of the above embodiments.
[0090] In practice, the dual direct injection fuel supply system can be a methanol-diesel dual direct injection fuel supply system, equipped with methanol injectors and diesel injectors.
[0091] In some embodiments, the dual direct injection fuel supply system may also include: a methanol tank, a temperature and humidity sensor, a methanol temperature quality sensor, and a nitrogen and oxygen sensor.
[0092] The temperature and humidity sensor can be installed at the engine's air intake to provide the temperature and humidity of the air intake. The nitrogen oxide sensor can be installed at the engine's exhaust port to provide the oxygen concentration at the exhaust port. The methanol temperature and quality sensor can be installed inside the methanol tank to provide the methanol concentration and temperature within the tank.
[0093] For details on the specific structure of the dual direct injection fuel supply system, please refer to [link / reference needed]. Figure 1 This will not be elaborated upon here.
[0094] Furthermore, embodiments of this application also provide a vehicle that includes a dual direct injection fuel supply system as described in any of the above embodiments.
[0095] Embodiments of this application also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a computer, causes the computer to perform the control method of the dual direct injection fuel supply system in any of the above embodiments.
[0096] Embodiments of this application also provide a computer program product containing instructions that, when executed by a computer, cause the computer to perform the control method for the dual direct injection fuel supply system described in any of the above embodiments.
[0097] It is understood that the specific examples in this document are only intended to help those skilled in the art better understand the embodiments described herein, and are not intended to limit the scope of the invention.
[0098] It is understood that in the various embodiments described in this specification, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments described in this specification.
[0099] It is understood that the various implementation methods described in this specification can be implemented individually or in combination, and the implementation methods in this specification are not limited in this respect.
[0100] Unless otherwise stated, all technical and scientific terms used in the embodiments of this specification have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this specification. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in the embodiments of this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.
[0101] It is understood that the processor in the embodiments of this specification can be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method embodiments can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this specification. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this specification can be directly implemented by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory; the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above methods.
[0102] It is understood that the memory in the embodiments of this specification may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory may be random access memory (RAM). It should be noted that the memory in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.
[0103] Those skilled in the art will 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, or a combination of computer software and electronic hardware. 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 implementation should not be considered beyond the scope of this specification.
[0104] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the aforementioned method implementations, and will not be repeated here.
[0105] In the several embodiments provided in this specification, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.
[0106] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.
[0107] In addition, the functional units in the various embodiments of this specification can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.
[0108] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of this specification, in essence, or the parts that contribute to the prior art, or parts of the technical solutions, can be embodied in the form of software products. These computer software products are stored in a storage medium and include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this specification. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0109] The above description is merely a specific embodiment of this specification, but the scope of protection of this invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this specification should be included within the scope of protection of this specification. Therefore, the scope of protection of this invention should be determined by the scope of the claims.
Claims
1. A control method for a dual direct injection fuel supply system, characterized in that, A dual direct injection fuel supply system for vehicles, the dual direct injection fuel supply system including a methanol injector; the method includes: The target operating conditions and target detection information of the vehicle are obtained; the target detection information includes the temperature and humidity of the engine intake, the oxygen concentration of the engine exhaust, and the methanol concentration and methanol temperature in the methanol tank of the dual direct injection fuel supply system. Based on the pre-built correspondence between operating conditions and detection information and the first injection correction coefficient, the first injection correction coefficient corresponding to the target operating condition and the target detection information is determined as the first target correction coefficient; Based on the first target correction coefficient, the base methanol injection quantity in the dual direct injection fuel supply system is corrected to obtain the target methanol injection quantity, and the methanol injector is controlled to operate based on the target methanol injection quantity.
2. The method according to claim 1, characterized in that, The hydraulic medium for the methanol injector includes high-pressure diesel fuel. The step of controlling the methanol injector to operate based on the target methanol injection quantity includes: The methanol injection control valve of the methanol injector is opened to allow the high-pressure diesel fuel to enter the hydraulic chamber of the methanol injector, driving the methanol injector to inject until the injection quantity of the methanol injector meets the target methanol injection quantity.
3. The method according to claim 2, characterized in that, Also includes: Obtain target monitoring information; The target monitoring information includes: the engine's water temperature and external atmospheric pressure; Based on the pre-built correspondence between operating conditions and monitoring information and the second injection correction coefficient, the second injection correction coefficient corresponding to the target operating condition and the target monitoring information is determined as the second target correction coefficient; The step of correcting the base methanol injection quantity in the dual direct injection fuel supply system based on the first target correction coefficient to obtain the target methanol injection quantity includes: Based on the first target correction coefficient and the second target correction coefficient, the base methanol injection quantity in the dual direct injection fuel supply system is corrected to obtain the target methanol injection quantity.
4. The method according to claim 3, characterized in that, The dual direct injection fuel supply system also includes diesel injectors; After acquiring the target monitoring information, the method further includes: Based on the pre-built correspondence between operating conditions and monitoring information and diesel injection correction coefficients, the diesel injection correction coefficients corresponding to the target operating conditions and the target monitoring information are determined as the third target correction coefficients. The base diesel injection quantity in the dual direct injection fuel supply system is corrected based on the third target correction coefficient to obtain the target diesel injection quantity, and the diesel injector is controlled to operate based on the target diesel injection quantity.
5. The method according to claim 4, characterized in that, The target operating condition includes the engine's target torque requirement and current operating speed; the method further includes: Determine the current load of the vehicle; Based on the pre-built correspondence between vehicle load and operating conditions and diesel torque distribution coefficient, the target diesel torque distribution coefficient is determined to be the current load of the vehicle and the diesel torque distribution coefficient corresponding to the target operating conditions. The target methanol torque distribution coefficient is determined based on the target diesel torque distribution coefficient. Based on the target torque demand, the target diesel torque allocation coefficient, and the target methanol torque allocation coefficient, determine the current methanol allocation torque demand and the current diesel allocation torque demand. Based on the pre-established correspondence between operating speed and methanol allocation torque and methanol injection quantity, the methanol injection quantity corresponding to the current operating speed and the current methanol allocation torque is determined as the methanol base injection quantity; and based on the pre-established correspondence between operating speed and diesel allocation torque and diesel injection quantity, the diesel injection quantity corresponding to the current operating speed and the current diesel allocation torque is determined as the diesel base injection quantity.
6. The method according to claim 1, characterized in that, The dual direct injection fuel supply system also includes a temperature and humidity sensor, a methanol temperature and quality sensor, and a nitrogen and oxygen sensor. The acquisition of the target detection information of the vehicle includes: The temperature and humidity of the engine intake are obtained through the temperature and humidity sensor, the oxygen concentration of the engine exhaust is obtained through the nitrogen-oxygen sensor, and the methanol concentration and temperature in the methanol tank of the dual direct injection fuel supply system are obtained through the methanol temperature and quality sensor.
7. An electronic device, characterized in that, include: A processor, and a memory connected to the processor; The memory is used to store computer programs; The processor is used to call and execute the computer program in the memory to perform the control method of the dual direct injection fuel supply system as described in any one of claims 1-6.
8. A dual direct injection fuel supply system, characterized in that, Includes a methanol injector and the electronic equipment as described in claim 7.
9. The dual direct injection fuel supply system according to claim 8, characterized in that, Also includes: Methanol tank, temperature and humidity sensor, methanol temperature quality sensor and nitrogen and oxygen sensor; The temperature and humidity sensor is located at the engine's air intake and is used to provide the temperature and humidity of the engine's air intake. The nitrogen oxide sensor is located at the exhaust port of the engine and is used to provide the oxygen concentration at the engine exhaust port. The methanol temperature and quality sensor is installed inside the methanol tank to provide the methanol concentration and temperature inside the methanol tank.
10. A vehicle, characterized in that, Includes the dual direct injection fuel supply system as described in claim 9.