Engine air inlet pressure adjusting method and device, electronic equipment and automobile

Abstract

The embodiment of the invention provides an engine air inlet pressure adjusting method and device, electronic equipment and an automobile, and relates to the technical field of automobile engines. The method comprises the steps that when an engine is in a VVT non-working state, the throttle opening degree of the engine, the rotating speed of the engine, the current air inlet amount and the first air inlet pressure in the previous collection period are obtained in real time; and according to the engine rotating speed, the maximum torque and the minimum torque corresponding to the engine rotating speed are obtained. And according to the preset air-fuel ratio, the opening degree of the throttle valve, the rotating speed of the engine, the current air inlet amount, the first air inlet pressure, the maximum torque and the minimum torque, an air inlet pressure limiting value is obtained. And the air inlet pressure of the engine is limited according to the air inlet pressure limiting value. According to the invention, preignition of the engine can be more reliably prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile engines, and in particular to an engine intake pressure regulating method, device, electronic equipment and automobile. Background Art

[0002] VVT (Variable Valve Timing) is a technology used in automotive piston engines. Its function is to adjust the opening time and duration of the intake and exhaust valves at any time according to the engine's operating conditions through the equipped control and execution system, so that the engine can obtain the best valve timing at different speeds, thereby increasing engine power, reducing fuel consumption, improving exhaust emissions and enhancing engine operation stability.

[0003] When the VVT ​​is faulty or closed, the engine is prone to pre-ignition. Currently, limiting the engine output torque is usually used to prevent pre-ignition, but this approach has limited effectiveness. Summary of the Invention

[0004] The objects of the present invention include, for example, providing an engine intake pressure regulating method, device, electronic equipment and automobile, which can at least partially solve the above-mentioned technical problems.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, an embodiment of the present invention provides a method for regulating engine intake pressure, the method comprising:

[0007] When the engine is in a VVT non-operating state, real-time acquisition of the engine's throttle opening, engine speed, current intake volume, and the first intake pressure in the previous acquisition cycle;

[0008] According to the engine speed, obtaining a maximum torque and a minimum torque corresponding to the engine speed;

[0009] Obtaining an intake pressure limit value according to a preset air-fuel ratio and the throttle opening, the engine speed, the current intake air volume, the first intake pressure, the maximum torque, and the minimum torque;

[0010] The intake pressure of the engine is limited according to the intake pressure limit value.

[0011] Optionally, obtaining the intake pressure limit value according to a preset air-fuel ratio and the throttle opening, the engine speed, the current intake air volume, the first intake pressure, the maximum torque, and the minimum torque includes:

[0012] determining the gas path torque of the engine according to the throttle opening, the engine speed, the maximum torque, and the minimum torque;

[0013] determining an expected maximum fuel injection amount of the engine according to the gas circuit torque and the engine speed;

[0014] An intake pressure limit value is obtained according to the maximum fuel injection quantity expected value, the air-fuel ratio, the first intake pressure and the current intake air quantity.

[0015] Optionally, determining the gas path torque of the engine according to the throttle opening, the engine speed, the maximum torque, and the minimum torque includes:

[0016] obtaining an accelerator pedal torque rate based on the engine speed and the throttle opening;

[0017] calculating a torque difference between the maximum torque and the minimum torque;

[0018] The gas circuit torque is determined according to the torque difference and the accelerator pedal torque rate.

[0019] Optionally, determining the expected maximum fuel injection amount of the engine according to the gas circuit torque and the engine speed includes:

[0020] Call the ignition efficiency limit table;

[0021] determining a corresponding ignition efficiency value from the ignition efficiency limit table based on the gas path torque and the engine speed;

[0022] Calculating a mean effective pressure of an engine cylinder according to the gas circuit torque and the cylinder volume of the engine;

[0023] The expected maximum fuel injection quantity is determined according to the mean effective pressure, the ignition efficiency value, and the fuel calorific value of the fuel in the engine.

[0024] Optionally, obtaining the intake pressure limit value according to the expected maximum fuel injection amount, the air-fuel ratio, the first intake pressure, and the current intake amount includes:

[0025] determining an expected value of a single-cylinder air intake amount of an engine cylinder based on the air-fuel ratio and the expected maximum fuel injection amount;

[0026] determining an intake coefficient according to the expected value of the single-cylinder intake volume and the current intake volume;

[0027] The intake pressure limit value is determined based on the intake coefficient and the first intake pressure.

[0028] Optionally, obtaining the maximum torque and the minimum torque corresponding to the engine speed according to the engine speed includes:

[0029] Call the speed torque relationship table;

[0030] The maximum torque and the minimum torque corresponding to the engine speed are determined from the speed-torque relationship table.

[0031] Optionally, the method further includes:

[0032] When the engine is in a VVT working state, obtaining a second intake pressure collected by the pressure sensor in a current collection cycle;

[0033] Within a preset time period, the second intake pressure is restricted to increase at a preset growth rate until the preset time period is reached, and the restriction on the second intake pressure is released.

[0034] In a second aspect, an embodiment of the present invention provides an engine intake pressure regulating device, the engine intake pressure regulating device comprising:

[0035] a parameter acquisition unit, configured to acquire, in real time, the throttle opening, engine speed, current intake air volume, and the first intake air pressure in a previous acquisition cycle of the engine when the VVT ​​is not in operation;

[0036] a torque determination unit, configured to obtain a maximum torque and a minimum torque corresponding to the engine speed according to the engine speed;

[0037] an intake pressure limit value determining unit, configured to obtain an intake pressure limit value according to a preset air-fuel ratio and the throttle opening, the engine speed, the current intake air volume, the first intake pressure, the maximum torque, and the minimum torque;

[0038] An intake pressure limiting unit is used to limit the intake pressure of the engine according to the intake pressure limit value.

[0039] In a third aspect, an embodiment of the present invention provides an electronic device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any one of the above methods when executing the program.

[0040] In a fourth aspect, an embodiment of the present invention provides a car, which implements the steps of any one of the above methods when running.

[0041] In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a computer program, and when the computer program is executed, the server where the computer-readable storage medium is located is controlled to implement the steps of any one of the above methods.

[0042] The beneficial effects of the embodiments of the present invention include, for example:

[0043] When VVT is not working, the throttle opening and engine speed are obtained, and parameters such as maximum torque, minimum torque, current intake volume, and first intake pressure are obtained based on the engine speed. The intake pressure limit value is determined by these parameters, and the intake pressure of the engine is limited. The engine is then limited from the perspective of the engine intake pressure and intake volume, thereby improving the prevention effect of pre-ignition. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 A block diagram of an electronic device provided by an embodiment of the present invention;

[0046] Figure 2 A flowchart of a method for regulating engine intake pressure provided by an embodiment of the present invention;

[0047] Figure 3 A flow chart of a method for regulating engine intake pressure provided by an embodiment of the present invention;

[0048] Figure 4 This is an architectural diagram of an engine intake pressure regulating device provided in an embodiment of the present invention.

[0049] Icons: 100 - electronic device; 110 - memory; 120 - processor; 130 - communication module; 300 - engine intake pressure regulating device; 301 - parameter acquisition unit; 302 - torque determination unit; 303 - intake pressure limit value determination unit; 304 - intake pressure limiting unit. DETAILED DESCRIPTION

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0052] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0053] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0054] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0055] Pre-ignition in automobile engines is an abnormal phenomenon in which the fuel mixture burns prematurely in the combustion chamber before ignition. This is typically caused by impurities such as carbon deposits, which create high-temperature spots within the combustion chamber, or by splashing oil and fuel droplets into the combustion chamber, which lowers the ignition point of the mixture and ignites it before the spark plug fires. Pre-ignition can lead to reduced engine performance, accompanied by a sudden detonation, and potentially cause power loss, engine overheating, and even in severe cases, engine inoperability.

[0056] The current method of preventing pre-ignition is usually to limit the engine's output torque. However, different speeds and intake pressures under high intake air temperatures can also have a significant impact on engine pre-ignition.

[0057] Based on the above situation, the embodiments of the present invention provide an engine intake pressure regulation method, device, electronic equipment and automobile, which can effectively alleviate the above technical problems.

[0058] Please refer to Figure 1, is a block diagram of an electronic device 100 provided in this application. The electronic device 100 can be a device capable of data processing, which is not limited in this embodiment. The electronic device 100 includes a memory 110, a processor 120, and a communication module 130. The memory 110, processor 120, and communication module 130 are electrically connected to each other directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected to each other via one or more communication buses or signal lines.

[0059] The memory 110 is used to store programs or data. The memory 110 may be, but is not limited to, a random access memory (RAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), etc.

[0060] The processor 120 is used to read / write data or programs stored in the memory and execute corresponding functions.

[0061] The communication module 130 is used to establish a communication connection between the server and other communication terminals through the network, and to send and receive data through the network.

[0062] It should be understood that Figure 1 The structure shown is only a schematic diagram of the structure of the electronic device 100. The electronic device 100 may also include Figure 1 More or fewer components than shown, or with Figure 1 Different configurations shown. Figure 1 The components shown in the figure can be implemented by hardware, software or a combination thereof. The electronic device 100 can be set in other devices or as an independent device.

[0063] An embodiment of the present invention provides a method for regulating engine intake pressure, the method comprising: Figure 2 The following steps are shown:

[0064] Step S110: When the engine is in a VVT non-operating state, the throttle opening, engine speed, current intake volume and first intake pressure in a previous acquisition cycle of the engine are acquired in real time.

[0065] Step S120: According to the engine speed, obtain the maximum torque and the minimum torque corresponding to the engine speed.

[0066] Step S130: obtaining an intake pressure limit value according to a preset air-fuel ratio and the throttle opening, the engine speed, the current intake air volume, the first intake pressure, the maximum torque and the minimum torque.

[0067] Step S140: limiting the intake pressure of the engine according to the intake pressure limit value.

[0068] In step S110 , when the engine is in a VVT non-operating state, the throttle opening, engine speed, current intake air volume and first intake air pressure in a previous acquisition cycle of the engine are acquired in real time.

[0069] The throttle opening is the opening angle of the engine throttle. When the user presses the accelerator pedal, the throttle opening changes according to the degree of pressing, thereby controlling the engine's intake volume and operating status.

[0070] When the engine is in a VVT-inactive state (i.e., VVT is off or faulty), the controller receives the engine's throttle opening and obtains the engine speed in real time under the current operating conditions. The pressure sensor can be used to collect engine intake pressure. When the engine is running, the pressure sensor collects intake pressure at a set frequency, with the interval between two collections being a collection cycle. The current intake air volume can be obtained in real time using an air flow meter.

[0071] In step S120 , the maximum torque and the minimum torque corresponding to the engine speed are acquired according to the engine speed.

[0072] The maximum torque and minimum torque can be calibrated in advance on the test bench according to the engine speed. Therefore, when the engine speed is obtained, the corresponding maximum torque and minimum torque can be directly obtained according to the current engine speed.

[0073] To further improve accuracy, you can also set assist torque, which allows you to determine in real time which assist torque is being obtained by looking at which type or types of assist torque the engine is currently generating. The assist torque can be one or more of: idle torque, cruise torque, start-up compensation torque, reserve torque, power-line coordination torque, gas-line coordination torque, and externally requested torque. Among them, idle torque refers to the torque generated when the engine is running under no-load conditions to maintain the target speed; cruising torque is the torque requested by the vehicle to maintain the set speed during cruise control; starting compensation torque provides additional power compensation when the vehicle starts to ensure a smooth and powerful start; reserve torque refers to the additional torque that the engine can output in excess of the maximum torque under specific working conditions. It reflects the power reserve capacity of the engine when acceleration or sudden resistance is required; the fire-circuit coordination torque is obtained after a series of calculations, and is a torque value used to meet the engine ignition requirements and maintain stable operation; the gas-circuit coordination torque is similar to the fire-circuit coordination torque. It is a torque value calculated in the engine control system to meet the intake requirements. It ensures that the engine has sufficient intake volume to support the combustion process; external request torque: refers to the request for engine torque from the vehicle's external system to meet specific driving functions or safety requirements.

[0074] In step S130, the intake pressure limit value is obtained according to the preset air-fuel ratio and the throttle opening, the engine speed, the current intake air amount, the first intake pressure, the maximum torque and the minimum torque.

[0075] The air-fuel ratio refers to the mass ratio of air to fuel in the mixture (for example, the air-fuel ratio of gasoline is 14.7:1). Once the air-fuel ratio, throttle opening, engine speed, current intake air volume, initial intake pressure, maximum torque, and minimum torque are determined, an intake pressure limit can be calculated based on these parameters to limit the engine's intake pressure.

[0076] Optionally, obtaining the intake pressure limit value according to a preset air-fuel ratio and the throttle opening, the engine speed, the current intake air volume, the first intake pressure, the maximum torque, and the minimum torque includes:

[0077] The gas path torque of the engine is determined according to the throttle opening, the engine speed, the maximum torque, and the minimum torque.

[0078] An expected maximum fuel injection quantity of the engine is determined according to the gas path torque and the engine speed.

[0079] An intake pressure limit value is obtained according to the maximum fuel injection quantity expected value, the air-fuel ratio, the first intake pressure and the current intake air quantity.

[0080] After obtaining the throttle opening, engine speed, maximum torque, minimum torque and auxiliary torque, the user's required torque can be obtained through the throttle opening, engine speed, maximum torque and minimum torque, and then the required torque plus the auxiliary torque can be used to obtain the engine's gas path torque.

[0081] Optionally, determining the gas path torque of the engine according to the throttle opening, the engine speed, the maximum torque, and the minimum torque includes:

[0082] An accelerator pedal torque rate is obtained based on the engine speed and the throttle opening.

[0083] A torque difference between the maximum torque and the minimum torque is calculated.

[0084] The gas circuit torque is determined according to the torque difference and the accelerator pedal torque rate.

[0085] In an alternative embodiment, a preset table can be searched based on engine speed and throttle opening to obtain the corresponding pedal torque rate. The pedal torque rate is then multiplied by the torque difference between the maximum and minimum torques under the current operating conditions, and the partial assist torque (such as idle torque, cruise torque, and starting compensation torque) is added to obtain the user's required torque. The required torque is then added to the partial assist torque (such as reserve torque, power circuit coordination torque, gas circuit coordination torque, and externally requested torque) to obtain the gas circuit torque.

[0086] After obtaining the gas line torque, the engine's ignition efficiency under stable conditions can be calculated using the gas line torque and engine speed. The mean effective pressure (MEP) of the engine cylinders can be calculated using the gas line torque and the engine's cylinder volume. Furthermore, the expected maximum fuel injection quantity can be calculated using the ignition efficiency and MEP.

[0087] Optionally, determining the expected maximum fuel injection amount of the engine according to the gas circuit torque and the engine speed includes:

[0088] An ignition efficiency limit table is called and a corresponding ignition efficiency value is determined from the ignition efficiency limit table based on the gas path torque and the engine speed.

[0089] The mean effective pressure of the engine cylinder is calculated according to the gas circuit torque and the cylinder volume of the engine.

[0090] The expected maximum fuel injection quantity is determined according to the mean effective pressure, the ignition efficiency value, and the fuel calorific value of the fuel in the engine.

[0091] The ignition efficiency value can be obtained by calling a preset ignition efficiency limit table and looking up the table according to the gas path torque and engine speed.

[0092] Table 1 shows the ignition efficiency limits for a Miller cycle engine, where C represents the gas line torque (in rpm) and n represents the engine speed (in N·m). As can be seen from Table 1, when the gas line torque is 30 N·m and the engine speed is 3500 rpm, the ignition efficiency value is 70.

[0093] Table 1 - Ignition efficiency limit table

[0094]

[0095] Mean Effective Pressure (IMEP) is the indicated work per unit cylinder volume per engine cycle. In one cycle, the engine rotates twice (720°), corresponding to 4π radians. IMEP is the ratio of the indicated work per cylinder cycle to the cylinder volume. Work is the product of torque, speed, and time, with speed multiplied by time expressed in radians. Therefore, IMEP can be calculated as the gas path torque multiplied by 4π, divided by the cylinder volume.

[0096] The derivation process of the formula is as follows:

[0097] IMEP=W / V

[0098] W=C*n*t

[0099] n*t=rad=4π

[0100] IMEP=(C*4π) / V

[0101] Where IMEP is the mean effective pressure, W is the indicated work done in one cycle, V is the cylinder volume, C is the gas path torque, n is the engine speed, t is time, and rad is radians.

[0102] After obtaining the mean effective pressure, the expected maximum injection amount can be calculated by using the ratio of the mean effective pressure to the fuel calorific value of the fuel in the engine (the fuel calorific value of different fuels is different) and the ignition efficiency value.

[0103] After calculating the expected maximum fuel injection amount, the expected single-cylinder intake amount of the engine cylinder can be determined by the air-fuel ratio and the expected maximum fuel injection amount. The intake coefficient is then determined by the expected single-cylinder intake amount and the current intake amount. The intake pressure limit value is determined based on the intake coefficient and the first intake pressure.

[0104] Optionally, obtaining the intake pressure limit value according to the expected maximum fuel injection amount, the air-fuel ratio, the first intake pressure, and the current intake amount includes:

[0105] A desired value of a single-cylinder intake air amount of an engine cylinder is determined based on the air-fuel ratio and the desired maximum fuel injection amount.

[0106] An intake coefficient is determined according to the expected value of the single-cylinder intake volume and the current intake volume.

[0107] The intake pressure limit value is determined based on the intake coefficient and the first intake pressure.

[0108] The desired single-cylinder intake volume can be calculated by multiplying the air-fuel ratio by the desired maximum injection volume. The intake coefficient can be calculated as the ratio of the desired single-cylinder intake volume to the current intake volume. The intake pressure limit value can be obtained by multiplying the intake coefficient by the first intake pressure measured by the pressure sensor during the previous acquisition cycle.

[0109] The formula for calculating the intake pressure limit value is as follows:

[0110] P=G / g*P0

[0111] Among them, P is the intake pressure limit value, G is the expected value of the single-cylinder intake volume, g is the current intake volume, and P0 is the first intake pressure.

[0112] In step S140 , the intake pressure of the engine is limited according to the intake pressure limit value.

[0113] After the intake pressure limit value is calculated, the intake pressure of the engine can be limited by the intake pressure limit value, thereby limiting the intake volume of the engine, so that the intake pressure of the engine is within a safe range, effectively preventing engine pre-ignition.

[0114] Optionally, obtaining the maximum torque and the minimum torque corresponding to the engine speed according to the engine speed includes:

[0115] A speed-torque relationship table is called to determine a maximum torque and a minimum torque corresponding to the engine speed from the speed-torque relationship table.

[0116] Developers measured the maximum and minimum torques at various engine speeds, compiled the corresponding values ​​into a speed-torque relationship table, and entered this information into the control system. When the controller obtains the engine speed, it calls the speed-torque relationship table to find the maximum and minimum torques corresponding to that engine speed.

[0117] Optionally, the method further includes:

[0118] When the engine is in a VVT working state, a second intake pressure collected by the pressure sensor in a current collection cycle is obtained.

[0119] Within a preset time period, the second intake pressure is restricted to increase at a preset growth rate until the preset time period is reached, and the restriction on the second intake pressure is released.

[0120] When VVT is operating normally, to prevent premature ignition caused by rapid intake pressure changes, the system captures a second intake pressure signal from the pressure sensor during the current acquisition cycle and limits the pressure to a preset rate of increase within a preset time period. Once the preset time period has elapsed, the rate of increase is no longer restricted.

[0121] In order to better illustrate the present invention, the embodiments of the present invention further provide Figure 3 The flow chart shown explains the present invention.

[0122] See also Figure 3 When the engine is in the VVT ​​non-working state, the throttle opening Th is received by the user based on the accelerator pedal, and the engine speed n under the current working condition is obtained in real time. The maximum torque T is obtained according to the engine speed. max , minimum torque T min , and the assist torque T can also be determined 辅 According to the throttle opening Th, engine speed n, maximum torque T max , minimum torque T min and assist torque T 辅 Determine the engine's gas path torque T 气 . Then according to the gas circuit torque T 气 The maximum fuel injection quantity E of the engine is determined based on the engine speed n. The current engine intake air quantity g and the first intake pressure P1 collected by the pressure sensor during the previous collection cycle are obtained. The intake pressure limit value P is calculated based on the maximum fuel injection quantity E, the air-fuel ratio A / F, the first intake pressure P1, and the current intake air quantity g. The engine intake pressure is limited based on the intake pressure limit value P.

[0123] Based on the same inventive concept, Figure 4 As shown, the embodiment of the present invention provides an engine intake pressure regulating device 300, comprising:

[0124] The parameter acquisition unit 301 is used to acquire the throttle opening, engine speed, current intake volume and the first intake pressure in the previous acquisition cycle of the engine in real time when the engine is in a VVT non-operating state.

[0125] The torque determination unit 302 is configured to obtain a maximum torque and a minimum torque corresponding to the engine speed according to the engine speed.

[0126] The intake pressure limit value determining unit 303 is used to obtain the intake pressure limit value according to the preset air-fuel ratio and the throttle opening, the engine speed, the current intake air volume, the first intake pressure, the maximum torque and the minimum torque.

[0127] The intake pressure limiting unit 304 is configured to limit the intake pressure of the engine according to the intake pressure limiting value.

[0128] Regarding the above-mentioned engine intake pressure regulating device 300, the specific functions of each unit therein have been described in detail in the embodiment of the engine intake pressure regulating method provided in this specification, and will not be elaborated here.

[0129] Based on the same inventive concept, an embodiment of the present invention specification provides an automobile, in which the specific functions of each unit have been described in detail in the embodiment of the engine intake pressure regulation method provided in this specification, and will not be elaborated here.

[0130] Based on the same inventive concept, an embodiment of the present invention specification provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-mentioned methods for regulating the engine intake pressure.

[0131] The present invention has at least the following beneficial effects:

[0132] When VVT is not operating, the system obtains throttle opening and engine speed, and then determines parameters such as maximum torque, minimum torque, current intake air volume, and first intake pressure based on the engine speed. These parameters are used to determine an intake pressure limit value, which is then used to limit the engine's intake pressure. This, in turn, limits the engine's intake pressure and intake air volume, improving the prevention of pre-ignition.

[0133] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of the devices, methods, and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, program segment, or part of the code, which contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the boxes can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, as well as the combination of boxes in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified functions or actions, or can be implemented using a combination of dedicated hardware and computer instructions.

[0134] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0135] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0136] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for regulating engine intake pressure, characterized in that: The method comprises: When the engine is in a VVT non-operating state, real-time acquisition of the engine's throttle opening, engine speed, current intake volume, and the first intake pressure in the previous acquisition cycle; According to the engine speed, obtaining a maximum torque and a minimum torque corresponding to the engine speed; Obtaining an intake pressure limit value according to a preset air-fuel ratio and the throttle opening, an engine speed, a current intake air volume, a first intake pressure, a maximum torque, and a minimum torque; The intake pressure of the engine is limited according to the intake pressure limit value.

2. The engine intake pressure regulating method according to claim 1, characterized in that: The engine intake pressure regulation method obtains the intake pressure limit value according to the preset air-fuel ratio and the throttle opening, the engine speed, the current intake amount, the first intake pressure, the maximum torque and the minimum torque, including: Determining the gas path torque of the engine according to the throttle opening, the engine speed, the maximum torque and the minimum torque; Determining an expected maximum fuel injection amount of the engine according to the gas path torque and the engine speed; An intake pressure limit value is obtained according to the maximum fuel injection quantity expected value, the air-fuel ratio, the first intake pressure and the current intake quantity.

3. The engine intake pressure regulating method according to claim 2, characterized in that: Determining the gas path torque of the engine according to the throttle opening, the engine speed, the maximum torque and the minimum torque includes: obtaining an accelerator pedal torque rate based on the engine speed and the throttle opening; calculating a torque difference between the maximum torque and the minimum torque; The gas circuit torque is determined according to the torque difference and the accelerator pedal torque rate.

4. The engine intake pressure regulating method according to claim 2, characterized in that: The step of determining the expected maximum fuel injection amount of the engine according to the gas path torque and the engine speed includes: Call the ignition efficiency limit table; Based on the gas path torque and the engine speed, determining a corresponding ignition efficiency value from the ignition efficiency limit table; Calculating a mean effective pressure of an engine cylinder according to the gas circuit torque and the cylinder volume of the engine; The expected maximum fuel injection quantity is determined according to the mean effective pressure, the ignition efficiency value and the fuel calorific value of the fuel in the engine.

5. The engine intake pressure regulating method according to claim 2, characterized in that: The obtaining of the intake pressure limit value according to the maximum fuel injection amount expected value, the air-fuel ratio, the first intake pressure and the current intake amount includes: Determining an expected value of a single-cylinder intake air amount of an engine cylinder based on the air-fuel ratio and the expected maximum fuel injection amount; Determining an intake coefficient according to the expected value of the single-cylinder intake volume and the current intake volume; The intake pressure limit value is determined based on the intake coefficient and the first intake pressure.

6. The engine intake pressure regulating method according to claim 1, characterized in that: The step of obtaining the maximum torque and the minimum torque corresponding to the engine speed according to the engine speed includes: Call the speed torque relationship table; The maximum torque and the minimum torque corresponding to the engine speed are determined from the speed-torque relationship table.

7. The engine intake pressure regulating method according to any one of claims 1 to 4, characterized in that: The method further comprises: When the engine is in a VVT working state, obtaining a second intake pressure collected by the pressure sensor in a current collection cycle; Within a preset time period, the second intake pressure is restricted to increase at a preset growth rate until the preset time period is reached, and the restriction on the second intake pressure is released.

8. An engine intake pressure regulating device, characterized in that: The engine intake pressure regulating device comprises: A parameter acquisition unit, used for acquiring the throttle opening, engine speed, current intake volume and the first intake pressure in the previous acquisition cycle of the engine in real time when the engine is in a VVT non-operating state; a torque determination unit, configured to obtain a maximum torque and a minimum torque corresponding to the engine speed according to the engine speed; an intake pressure limit value determination unit, configured to obtain an intake pressure limit value according to a preset air-fuel ratio and the throttle opening, an engine speed, a current intake air volume, a first intake pressure, a maximum torque, and a minimum torque; An intake pressure limiting unit is used to limit the intake pressure of the engine according to the intake pressure limiting value.

9. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 7 when executing the program.

10. An automobile, characterized in that: The automobile implements the steps of the method according to any one of claims 1 to 7 when in operation.

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