Engine oil injection control method and device, computer readable storage medium and vehicle

Abstract

The invention discloses an engine fuel injection control method and device, a computer readable storage medium and a vehicle. The method comprises the steps that in the fuel injection process of a fuel injection nozzle, the actual seating time of a fuel injection nozzle needle valve is determined, and the actual seating time is the stable contact time between the fuel injection nozzle needle valve and a valve seat; the oil injection quantity deviation is determined based on the ideal oil injection cut-off moment and the actual seating moment of the oil injection nozzle; and in the next oil injection process of the oil injection nozzle, the oil injection nozzle is controlled based on the oil injection quantity deviation. According to the control method, the oil injection quantity can be accurately controlled, and the effect of overall emission reduction is achieved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to an engine fuel injection control method, a computer-readable storage medium, a vehicle, and an engine fuel injection control device. Background Art

[0002] Traditional fuel engines have strict emission reduction targets, which raises the requirements for fuel injection control. Real-time adjustments must be made to ensure accurate fuel injection quantity each time, ensure full combustion, and achieve emission reduction targets.

[0003] At present, the solutions in the related technologies focus on exhaust gas post-treatment, ventilation treatment, etc. These solutions adjust the stages before and after combustion. These solutions adjust the intake and exhaust gas indirectly, which is costly, slow to respond, and the effect cannot be achieved immediately. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first purpose of the present application is to propose an engine fuel injection control method, in the process of fuel injection by the fuel injector, determine the actual seating time of the fuel injector needle valve, the actual seating time is the time when the fuel injector needle valve is in stable contact with the valve seat, determine the fuel injection amount deviation based on the ideal fuel injection cut-off time of the fuel injector and the actual seating time, and in the process of the next fuel injection by the fuel injector, control the fuel injector based on the fuel injection amount deviation, thereby being able to accurately control the fuel injection amount and achieve the effect of overall emission reduction.

[0005] A second object of the present application is to provide a computer-readable storage medium.

[0006] The third object of the present application is to provide a vehicle.

[0007] The fourth objective of the present application is to provide an engine fuel injection control device.

[0008] To achieve the above-mentioned purpose, the first aspect embodiment of the present application proposes an engine injection control method, the method comprising: during the process of fuel injection by the injector, determining the actual seating time of the injector needle valve, the actual seating time being the time when the injector needle valve is in stable contact with the valve seat; determining the injection amount deviation based on the ideal injection cut-off time of the injector and the actual seating time; during the next fuel injection process of the injector, controlling the injector based on the injection amount deviation.

[0009] According to the engine fuel injection control method of the embodiment of the present application, firstly, during the fuel injection process of the fuel injector, the actual seating time of the fuel injector needle valve is determined, and the actual seating time is the time when the fuel injector needle valve is in stable contact with the valve seat, and then the fuel injection amount deviation is determined based on the ideal fuel injection cut-off time of the fuel injector and the actual seating time, and finally, during the next fuel injection process of the fuel injector, the fuel injector is controlled based on the fuel injection amount deviation. Therefore, the method can accurately control the fuel injection amount and achieve the effect of overall emission reduction.

[0010] In addition, the engine fuel injection control method according to the above embodiment of the present application may also have the following additional technical features:

[0011] According to one embodiment of the present application, determining the actual seating time of the injector needle valve includes: obtaining a voltage difference between two ends of the injector; and determining the actual seating time based on the voltage difference.

[0012] According to one embodiment of the present application, determining the actual seating time based on the voltage difference includes: filtering and differentiating the voltage difference to obtain the voltage change rate; and when the voltage change rate is a preset threshold, determining the current time as the actual seating time.

[0013] According to one embodiment of the present application, determining the injection amount deviation based on the ideal injection cut-off time and the actual seating time of the injector includes: obtaining the delay time between the ideal injection cut-off time and the actual seating time; and determining the injection amount deviation based on the injection pressure of the injector and the delay time.

[0014] According to one embodiment of the present application, the controlling the fuel injector based on the injection quantity deviation includes: adjusting the target injection pulse width of the fuel injector based on the injection quantity deviation so that the actual injection quantity of the fuel injector is the same as the target injection quantity of the fuel injector, wherein the target injection quantity and the target injection pulse width are determined according to the operating parameters of the engine.

[0015] According to one embodiment of the present application, the adjusting the target injection pulse width of the injector based on the injection quantity deviation includes: determining the adjustment amount of the injection pulse width based on the injection quantity deviation; and lowering the target injection pulse width based on the difference between the target injection pulse width and the adjustment amount.

[0016] According to one embodiment of the present application, the method further includes: determining an ideal injection cut-off time of the injector based on operating parameters of the engine, wherein the operating parameters include engine speed, engine intake temperature and intake pressure.

[0017] In order to achieve the above-mentioned purpose, the second embodiment of the present application proposes a computer-readable storage medium, on which a program is stored, and when the program is executed by a processor, the above-mentioned engine injection control method is implemented.

[0018] According to the computer-readable storage medium of the embodiment of the present application, by implementing the above-mentioned engine fuel injection control method during execution, the fuel injection amount can be accurately controlled to achieve the effect of overall emission reduction.

[0019] To achieve the above-mentioned purpose, a vehicle is proposed in the third aspect of the embodiment of the present application, including a memory, a processor, and a program stored in the memory and executable on the processor, and when the processor executes the program, the above-mentioned engine injection control method is implemented.

[0020] According to the vehicle of the embodiment of the present application, by executing the above-mentioned engine injection control method, the injection amount can be accurately controlled to achieve the effect of overall emission reduction.

[0021] To achieve the above-mentioned purpose, the fourth aspect embodiment of the present application proposes an engine injection control device, which includes: the device includes: a first determination module, which is used to determine the actual seating time of the injector needle valve during the process of the injector injecting fuel, and the actual seating time is the time when the injector needle valve is in stable contact with the valve seat; a second determination module, which is used to determine the injection amount deviation based on the ideal injection cut-off time of the injector and the actual seating time; a control module, which is used to control the injector based on the injection amount deviation during the next injection of the injector.

[0022] According to the engine fuel injection control device of the embodiment of the present application, the first determination module is used to determine the actual seating time of the fuel injector needle valve during the fuel injection process of the fuel injector, and the actual seating time is the time when the fuel injector needle valve is in stable contact with the valve seat. The second determination module is used to determine the fuel injection amount deviation based on the ideal fuel injection cut-off time and the actual seating time of the fuel injector. The control module is used to control the fuel injector based on the fuel injection amount deviation during the next fuel injection process of the fuel injector. Therefore, the device can accurately control the fuel injection amount and achieve the effect of overall emission reduction.

[0023] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a flow chart of an engine fuel injection control method according to an embodiment of the present application;

[0025] Figure 2 is a flow chart of an engine fuel injection control method according to a specific example of the present application;

[0026] Figure 3 is a block diagram of a vehicle according to an embodiment of the present application;

[0027] Figure 4 Schematic diagram of a block diagram of an engine fuel injection control device according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0029] For direct fuel injection engines, when the injector needle valve leaves its seat, the injection path is opened and the nozzle sprays fuel. When the injector needle valve is seated, the injection path is blocked and the injection is completely stopped. The needle valve movement principle is mainly determined by the combined force of the built-in spring and the inductive magnetic force: the built-in spring, the spring force always pushes the needle valve to the seated position, the inductive coil, the coil surrounds the needle valve, and when the driving current generates magnetic force in the coil, the magnetic force is opposite to the spring force, pulling the needle valve off the seat. In other words, if the magnetic force > spring force, the needle valve leaves its seat, the injection path is opened, and the injector sprays fuel. If the magnetic force = spring force, the needle valve maintains its current position and the injection state is maintained. If the magnetic force < spring force, the needle valve returns to the seated state, the injection path is blocked, and the injection ends.

[0030] In addition, combined with the needle valve movement and driving current, the injection process can be divided into different stages. For example, in the first stage, all drives are turned off, resulting in no driving current for the inductor coil, the needle valve value is affected by the spring force, the injection needle valve remains in a stable seated state, and no injection is performed at all. In the second stage, within a short period of time, the chip realizes that the injection drive current rises rapidly from 0A to 12A, and the magnetic force of the inductor coil quickly exceeds the spring force, causing the injector needle valve to leave its seat, opening the injection passage, and starting the in-cylinder injection. In the third stage, the current value is reduced, and the needle valve is still kept off its seat, maintaining the injection state unchanged until the injection time ends. In the fourth stage, the injection drive is turned off, the needle valve is seated, and this injection ends.

[0031] Since there is an inductor coil inside the fuel injector, when the fourth stage of the drive is closed, the inductor coil will generate an electromotive force. During the discharge of the electromotive force, the current can only decay to 0A, delaying the needle valve seating action and causing injection cut-off delay. In addition, when the needle valve is seated, the needle valve mechanically collides, causing the needle valve to rebound, which also causes injection cut-off delay. The above two points both cause injection cut-off delays, affect the accuracy of fuel injection control, and cause the actual injection amount to be greater than the ideal injection amount, which seriously affects emissions and combustion indicators. Fuel injection amount compensation must be performed to ensure that the injection amount is consistent with the theoretical value.

[0032] To this end, the present application proposes an engine injection control method, which determines the actual seating time of the injector needle valve during the injector injection process, the actual seating time being the moment when the injector needle valve is in stable contact with the valve seat, and determines the injection amount deviation based on the ideal injection cut-off time of the injector and the actual seating time. During the next injector injection process, the injector is controlled based on the injection amount deviation, thereby being able to accurately control the injection amount and achieve an overall emission reduction effect.

[0033] The following describes the engine fuel injection control method, computer-readable storage medium, vehicle and engine fuel injection control device proposed in the embodiments of the present application with reference to the accompanying drawings.

[0034] Figure 1 Flowchart of an engine fuel injection control method according to an embodiment of the present application.

[0035] like Figure 1 As shown, the engine fuel injection control method of the embodiment of the present application may include the following steps:

[0036] S1, during the process of the fuel injector injecting fuel, determining the actual seating time of the fuel injector needle valve, the actual seating time being the time when the fuel injector needle valve is in stable contact with the valve seat;

[0037] S2, determining the injection amount deviation based on the ideal injection cut-off time and the actual seating time of the injector;

[0038] S3, during the next fuel injection process of the fuel injector, the fuel injector is controlled based on the fuel injection amount deviation.

[0039] Specifically, in the process of fuel injection by the injector, in order to ensure precise control of the injection amount, it is necessary to accurately determine the moment when the injector needle valve is completely closed, that is, to determine the actual seating moment of the injector needle valve. The actual seating moment is the moment when the injector needle valve is in stable contact with the valve seat. For example, the moment when the needle valve is in stable contact with the valve seat is determined, which usually corresponds to a specific point in the voltage signal. For example, a sudden change in voltage or a steady drop to zero can be used as the moment when the injector needle valve is in stable contact with the valve seat.

[0040] After determining the actual seating time, the fuel injection amount deviation can be determined based on the ideal fuel injection cut-off time and the actual seating time of the fuel injector, so as to compensate for the fuel injection amount deviation. Among them, the ideal fuel injection cut-off time is the fuel injection end time calculated based on the theoretical demand of the engine. It can be calculated by the engine control unit based on the current engine operating parameters (such as engine speed, load, intake air volume, intake air temperature, etc.). In addition, the determination of the ideal fuel injection cut-off time may also consider the type of fuel, the specific requirements of the engine, and the expected combustion efficiency and emission standards. The actual seating time refers to the actual time point when the fuel injector needle valve is completely closed and the fuel injection stops. The fuel injection amount deviation can be determined by a pre-set corresponding relationship. For example, the relationship between the ideal fuel injection cut-off time and the actual seating time of the fuel injector and the fuel injection amount deviation is pre-determined. After the ideal fuel injection cut-off time and the actual seating time are determined, the fuel injection amount deviation can be obtained by directly calling the corresponding relationship.

[0041] Therefore, after determining the fuel injection amount deviation, the fuel injector can be controlled based on the fuel injection amount deviation during the next fuel injection process. For example, the fuel injection pulse width of the fuel injector can be adjusted to compensate for the fuel injection amount deviation and ensure that the actual fuel injection amount is consistent with the target fuel injection amount. If the fuel injection amount deviation is positive (too much fuel injection), the pulse width of the next fuel injection is reduced; if the fuel injection amount deviation is negative (insufficient fuel injection), the pulse width of the next fuel injection is increased. In this way, the fuel injection process of the fuel injector can be effectively controlled to ensure the accuracy of the fuel injection amount, thereby optimizing the performance of the engine and reducing emissions, and realizing closed-loop control. Through real-time feedback and adjustment, the responsiveness and stability of the fuel injection system are improved.

[0042] According to one embodiment of the present application, determining the actual seating time of the needle valve of the fuel injector includes: obtaining the voltage difference between the two ends of the fuel injector; and determining the actual seating time based on the voltage difference.

[0043] Specifically, when determining the actual seating time of the needle valve of the fuel injector, the voltage difference at both ends of the fuel injector can be obtained. For example, a voltage monitoring device, such as a high-precision oscilloscope or voltage sensor, can be connected to both ends of the fuel injector for acquisition. In other words, the position of the needle valve of the fuel injector can be determined by detecting the change in the voltage at both ends. When the needle valve moves from the open position to the closed position, a voltage difference will be generated at both ends of the fuel injector due to the change in inductance. This voltage difference can be used as an important basis for judging the seating state of the needle valve. After obtaining the voltage difference at both ends of the fuel injector, the actual seating time can be determined according to the voltage difference at both ends of the fuel injector. That is, during the working process of the fuel injector, the moment when the needle valve is seated will generate an obvious characteristic point on the current waveform. By monitoring this characteristic point, the actual seating time of the needle valve can be determined. For example, when the driving current of the fuel injector is cut off, due to the inductance effect inside the fuel injector, a reverse electromotive force will be generated on the current waveform. The generation of this reverse electromotive force indicates that the needle valve has begun to seat. As the needle valve continues to move downward, the current waveform will gradually decrease until it reaches a stable state, at which point it can be considered that the needle valve has completely seated. This can effectively determine the actual seating time of the injector needle valve, and accordingly optimize the injection strategy to improve engine performance and efficiency.

[0044] Further, according to an embodiment of the present application, determining the actual seating time based on the voltage difference includes: filtering and differentiating the voltage difference to obtain the voltage change rate; and determining the current time as the actual seating time when the voltage change rate is a preset threshold. The preset threshold can be determined according to actual conditions, for example, the preset threshold can be zero.

[0045] Specifically, when determining the actual seating time based on the voltage difference, that is, in order to more accurately identify the time when the needle valve seats, the voltage signal at both ends of the injector needs to be properly processed. For example, an oscilloscope or a data acquisition module is used to collect the voltage signals at both ends of the injector in real time, and the collected raw voltage signals are pre-processed. The voltage difference can be filtered and differentiated to obtain the voltage change rate, wherein filtering can remove noise, and differential processing can highlight the change trend in the voltage signal, making the voltage change when the needle valve seats more obvious.

[0046] A threshold value of the voltage change rate is determined, which is used to identify the characteristic point of the needle valve seating. The setting of the threshold is usually based on experimental data and previous experience, and needs to be high enough to distinguish the needle valve seating from other voltage changes. The voltage change rate is compared with the preset threshold. When the voltage change rate is the preset threshold, it is considered that the characteristic point of the needle valve seating is detected, and the current moment can be determined as the actual seating moment. In this way, the actual seating moment of the injector needle valve can be accurately determined, which is crucial for optimizing fuel injection and improving engine performance.

[0047] According to one embodiment of the present application, the injection amount deviation is determined based on the ideal injection cut-off time and the actual seating time of the injector, including: obtaining the delay time between the ideal injection cut-off time and the actual seating time; and determining the injection amount deviation based on the injection pressure and delay time of the injector.

[0048] Specifically, when determining the injection amount deviation according to the ideal injection cut-off time and the actual seating time of the injector, the delay time between the ideal injection cut-off time and the actual seating time can be obtained, that is, the actual seating time will be later than the ideal injection cut-off time, and the delay time can be obtained by subtracting the ideal injection cut-off time from the actual seating time, that is, this delay time reflects the speed of the injection system response and is an important parameter for evaluating the injection accuracy. After determining the delay time, the injection amount deviation can be determined according to the injection pressure and delay time of the injector. That is, the injection amount deviation is the difference between the injection amount and the theoretical value caused by the asynchrony between the actual seating time and the ideal injection cut-off time, wherein the injection pressure refers to the pressure inside the injector, which directly affects the injection amount and the injection speed. For example, the injection amount deviation can be determined by a pre-set corresponding relationship, for example, the relationship between the injection pressure and delay time of the injector and the injection amount deviation is pre-determined, and after the injection pressure and delay time of the injector are determined, the injection amount deviation can be obtained by directly calling the corresponding relationship. Therefore, the injection strategy, such as injection pulse width, injection pressure, etc., can be adjusted according to the calculated injection quantity deviation to reduce the deviation and improve the injection accuracy.

[0049] According to one embodiment of the present application, the fuel injector is controlled based on the fuel injection quantity deviation, including: adjusting the target fuel injection pulse width of the fuel injector based on the fuel injection quantity deviation so that the actual fuel injection quantity of the fuel injector is the same as the target fuel injection quantity of the fuel injector, wherein the target fuel injection quantity and the target fuel injection pulse width are determined according to the operating parameters of the engine.

[0050] Specifically, when the fuel injector is controlled according to the fuel injection amount deviation, the target fuel injection pulse width of the fuel injector can be adjusted based on the fuel injection amount deviation so that the actual fuel injection amount of the fuel injector is the same as the target fuel injection amount of the fuel injector. For example, the operating parameters of the engine can be monitored and collected in real time. These parameters may include engine speed, intake air temperature, intake air pressure, coolant temperature, throttle position, etc. The target fuel injection amount and target fuel injection pulse width can be calculated based on the control strategy and mapping table in the engine control unit and the operating parameters of the engine. That is, the target fuel injection amount refers to the amount of fuel required by the engine under the current working conditions in order to achieve the ideal air-fuel ratio and combustion efficiency. The target fuel injection pulse width refers to the length of time the fuel injector is open, which determines the duration of fuel injection.

[0051] According to the injection amount deviation, the target injection pulse width that needs to be adjusted is calculated. For example, if the actual injection amount is greater than the target injection amount, the target injection pulse width is reduced; if the actual injection amount is less than the target injection amount, the target injection pulse width is increased. The target injection pulse width is adjusted by adjusting the drive signal of the injector. In this way, the injection pulse width can be accurately adjusted to compensate for the injection amount deviation, thereby optimizing fuel economy and reducing emissions, ensuring that the actual injection amount of the injector is the same as the target injection amount, which helps the engine achieve optimal performance under various operating conditions.

[0052] According to one embodiment of the present application, the target injection pulse width of the injector is adjusted based on the injection quantity deviation, including: determining the adjustment amount of the injection pulse width based on the injection quantity deviation; and reducing the target injection pulse width based on the difference between the target injection pulse width and the adjustment amount.

[0053] Specifically, when adjusting the target injection pulse width of the injector according to the injection amount deviation, the adjustment amount of the injection pulse width can be determined first according to the injection amount deviation. For example, the adjustment amount of the injection pulse width is determined by a pre-set corresponding relationship, for example, the relationship between the injection amount deviation and the adjustment amount of the injection pulse width is pre-determined, and after the injection amount deviation is determined, the adjustment amount of the injection pulse width can be obtained by directly calling the corresponding relationship. In other words, the amount of injection pulse width that needs to be adjusted is calculated according to the ratio of the injection amount deviation. The adjustment amount of the injection pulse width refers to the injection time that needs to be increased or decreased to compensate for the deviation. For example, if the injection amount deviation is a positive value (indicating that the actual injection amount is greater than the ideal injection amount), the injection pulse width needs to be reduced; if it is a negative value, the injection pulse width needs to be increased.

[0054] After determining the adjustment amount of the injection pulse width, the target injection pulse width can be adjusted down according to the difference between the target injection pulse width and the adjustment amount. The calculated adjustment amount is applied to the target injection pulse width to obtain a new injection pulse width. For example, if the target injection pulse width is 2ms and the adjustment amount is -0.1ms, the new injection pulse width is 1.9ms. Thus, through real-time feedback and adjustment, closed-loop control is achieved to ensure the stability and responsiveness of the injection system. The injection pulse width can be accurately adjusted to compensate for the injection amount deviation, thereby optimizing fuel economy and reducing emissions.

[0055] According to one embodiment of the present application, the engine injection control method further includes: determining an ideal injection cut-off time of the injector based on operating parameters of the engine, wherein the operating parameters include engine speed, engine intake temperature and intake pressure.

[0056] Specifically, when determining the ideal injection cut-off time of the injector, it can be determined by the operating parameters of the engine, for example, the parameters include but are not limited to the engine speed, intake air temperature and intake air pressure. The operating parameters of the engine are monitored and collected in real time, which are important factors affecting the fuel demand and injection timing. Among them, the engine speed reflects the number of revolutions per minute of the engine, which directly affects the number of injections and the amount of injection. The intake air temperature and intake air pressure reflect the intake air density and the amount of air, which determine the fuel-air mixture ratio. For example, the amount of fuel required at the theoretical air-fuel ratio can be calculated based on the air flow and the operating state of the engine. The ideal injection amount is usually based on the amount of fuel required for the engine to achieve the best combustion efficiency and emission standards. Then, the ideal injection start time is calculated in combination with the engine's ignition timing and injection advance angle. The ideal injection cut-off time is usually before the piston reaches the top of the compression stroke to ensure that the fuel has enough time to mix with the air to form a mixture. In addition, the injection timing can be fine-tuned according to other parameters such as engine load, coolant temperature, throttle position, etc., and the control algorithm in the engine control unit is used to dynamically adjust the injection timing. This ensures that the engine can obtain the best injection timing under different operating conditions, thereby optimizing fuel economy and reducing emissions.

[0057] Combine the following Figure 2 To describe the control method of the present application.

[0058] As a specific example, the engine fuel injection control method of the present application may include the following steps:

[0059] S101, during the process of the fuel injector injecting fuel, obtaining a voltage difference between two ends of the fuel injector.

[0060] S102, filtering and differentiating the voltage difference to obtain a voltage change rate.

[0061] S103, determine whether the voltage change rate reaches a preset threshold. If yes, execute step S104; if no, execute step S101.

[0062] S104, determining the current time as the actual seating time.

[0063] S105, obtaining the delay time between the ideal injection cut-off time and the actual seating time.

[0064] S106, determining the fuel injection amount deviation based on the fuel injection pressure and the delay time of the fuel injection nozzle.

[0065] S107, determining an adjustment amount of the injection pulse width based on the injection amount deviation.

[0066] S108, adjusting the target injection pulse width to decrease based on the difference between the target injection pulse width and the adjustment amount.

[0067] In summary, according to the engine fuel injection control method of the embodiment of the present application, firstly, during the fuel injection process of the fuel injector, the actual seating time of the fuel injector needle valve is determined, and the actual seating time is the time when the fuel injector needle valve is in stable contact with the valve seat, and then the fuel injection amount deviation is determined based on the ideal fuel injection cut-off time of the fuel injector and the actual seating time, and finally, during the next fuel injection process of the fuel injector, the fuel injector is controlled based on the fuel injection amount deviation. Therefore, the method can accurately control the fuel injection amount and achieve the effect of overall emission reduction.

[0068] Corresponding to the above embodiments, the present application also proposes a computer-readable storage medium.

[0069] The computer-readable storage medium of the embodiment of the present application stores a program, which implements the above-mentioned engine injection control method when executed by a processor.

[0070] According to the computer-readable storage medium of the embodiment of the present application, by executing the above-mentioned engine fuel injection control method, the fuel injection amount can be accurately controlled to achieve the effect of overall emission reduction.

[0071] Corresponding to the above embodiments, the present application also proposes a vehicle.

[0072] like Figure 3 As shown, the vehicle 200 of the embodiment of the present application may include: a memory 210, a processor 220, and a program stored in the memory 210 and executable on the processor 220. When the processor 220 executes the program, the above-mentioned engine injection control method is implemented.

[0073] According to the vehicle of the embodiment of the present application, by executing the above-mentioned engine injection control method, the injection amount can be accurately controlled to achieve the effect of overall emission reduction.

[0074] Corresponding to the above embodiments, the present application also proposes an engine fuel injection control device.

[0075] like Figure 4 As shown, the engine injection control device 100 of the embodiment of the present application includes: a first determination module 110 , a second determination module 120 and a control module 130 .

[0076] The first determination module 110 is used to determine the actual seating time of the injector needle valve during the process of injecting fuel from the injector, and the actual seating time is the time when the injector needle valve is in stable contact with the valve seat. The second determination module 120 is used to determine the injection amount deviation based on the ideal injection cut-off time and the actual seating time of the injector. The control module 130 is used to control the injector based on the injection amount deviation during the next injection of the injector.

[0077] According to an embodiment of the present application, the first determination module 110 determines the actual seating time of the injector needle valve, specifically for: obtaining the voltage difference across the injector; and determining the actual seating time based on the voltage difference.

[0078] According to one embodiment of the present application, the first determination module 110 determines the actual seating time based on the voltage difference, and is specifically used to: filter and differentiate the voltage difference to obtain the voltage change rate; when the voltage change rate is a preset threshold, determine that the current moment is the actual seating time.

[0079] According to one embodiment of the present application, the determination module 120 determines the injection quantity deviation based on the ideal injection cut-off time and the actual seating time of the injector, and is specifically used to: obtain the delay time between the ideal injection cut-off time and the actual seating time; determine the injection quantity deviation based on the injection pressure and delay time of the injector.

[0080] According to one embodiment of the present application, the control module 130 controls the fuel injector based on the fuel injection quantity deviation, specifically for: adjusting the target fuel injection pulse width of the fuel injector based on the fuel injection quantity deviation so that the actual fuel injection quantity of the fuel injector is the same as the target fuel injection quantity of the fuel injector, wherein the target fuel injection quantity and the target injection pulse width are determined according to the operating parameters of the engine.

[0081] According to one embodiment of the present application, the control module 130 adjusts the target injection pulse width of the injector based on the injection quantity deviation, specifically for: determining the adjustment amount of the injection pulse width based on the injection quantity deviation; and reducing the target injection pulse width based on the difference between the target injection pulse width and the adjustment amount.

[0082] According to one embodiment of the present application, the determination module 120 is further used to determine an ideal injection cut-off time of the injector based on operating parameters of the engine, wherein the operating parameters include engine speed, engine intake temperature and intake pressure.

[0083] It should be noted that for details not disclosed in the engine injection control device of the embodiment of the present application, please refer to the details disclosed in the engine injection control method of the embodiment of the present application, and the details will not be repeated here.

[0084] According to the engine fuel injection control device of the embodiment of the present application, the first determination module is used to determine the actual seating time of the fuel injector needle valve during the fuel injection process of the fuel injector, and the actual seating time is the time when the fuel injector needle valve is in stable contact with the valve seat. The second determination module is used to determine the fuel injection amount deviation based on the ideal fuel injection cut-off time and the actual seating time of the fuel injector. The control module is used to control the fuel injector based on the fuel injection amount deviation during the next fuel injection process of the fuel injector. Therefore, the device can accurately control the fuel injection amount and achieve the effect of overall emission reduction.

[0085] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0086] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0088] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0089] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0090] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An engine fuel injection control method, characterized in that: The method comprises: During the process of the fuel injector injecting fuel, determining the actual seating time of the fuel injector needle valve, wherein the actual seating time is the time when the fuel injector needle valve is in stable contact with the valve seat; determining a fuel injection amount deviation based on an ideal fuel injection cut-off time of the fuel injector and the actual seating time; During the next fuel injection process of the fuel injector, the fuel injector is controlled based on the fuel injection amount deviation.

2. The engine fuel injection control method according to claim 1, characterized in that: Determining the actual seating time of the injection nozzle needle valve includes: Obtaining a voltage difference between two ends of the fuel injection nozzle; The actual seating time is determined based on the voltage difference.

3. The engine fuel injection control method according to claim 2, characterized in that: The determining the actual seating time based on the voltage difference comprises: Filtering and differentiating the voltage difference to obtain a voltage change rate; When the voltage change rate is a preset threshold, the current time is determined to be the actual seating time.

4. The engine fuel injection control method according to claim 1, characterized in that: The step of determining the fuel injection amount deviation based on the ideal fuel injection cut-off time and the actual seating time of the fuel injector includes: Obtaining a delay time between the ideal injection cut-off time and the actual seating time; The injection amount deviation is determined based on the injection pressure of the injection nozzle and the delay time.

5. The engine fuel injection control method according to claim 1, characterized in that: The controlling the fuel injector based on the fuel injection amount deviation includes: The target injection pulse width of the fuel injector is adjusted based on the injection quantity deviation so that the actual injection quantity of the fuel injector is the same as the target injection quantity of the fuel injector, wherein the target injection quantity and the target injection pulse width are determined according to the operating parameters of the engine.

6. The engine fuel injection control method according to claim 5, characterized in that: The step of adjusting the target fuel injection pulse width of the fuel injector based on the fuel injection amount deviation includes: determining an adjustment amount of the injection pulse width based on the injection amount deviation; The target injection pulse width is adjusted to decrease based on a difference between the target injection pulse width and the adjustment amount.

7. The engine fuel injection control method according to claim 1, characterized in that: The method further comprises: The ideal fuel injection cut-off time of the fuel injector is determined based on the operating parameters of the engine, wherein the operating parameters include engine speed, engine intake temperature and intake pressure.

8. A computer-readable storage medium, characterized in that: A program is stored thereon, and when the program is executed by a processor, the engine fuel injection control method according to any one of claims 1-7 is implemented.

9. A vehicle, characterized in that: include: A memory, a processor, and a program stored in the memory and executable on the processor, wherein when the processor executes the program, the engine fuel injection control method according to any one of claims 1 to 7 is implemented.

10. An engine fuel injection control device, characterized in that: The device comprises: A first determining module is used to determine the actual seating time of the needle valve of the fuel injector during the fuel injection process of the fuel injector, wherein the actual seating time is the time when the needle valve of the fuel injector is in stable contact with the valve seat; a second determination module, configured to determine a fuel injection amount deviation based on an ideal fuel injection cut-off time and the actual seating time of the fuel injector; The control module is used to control the fuel injector based on the fuel injection amount deviation during the next fuel injection process of the fuel injector.

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