CN112983669B

CN112983669B - Injection control method, controller, control system, control device and engine

Info

Publication number: CN112983669B
Application number: CN202110366472.9A
Authority: CN
Inventors: 曹石; 孙龙洋; 李国朋; 孙明峰
Original assignee: Weichai Power Co Ltd; Weifang Weichai Power Technology Co Ltd
Current assignee: Weichai Power Co Ltd; Weifang Weichai Power Technology Co Ltd
Priority date: 2021-04-06
Filing date: 2021-04-06
Publication date: 2022-11-29
Anticipated expiration: 2041-04-06
Also published as: CN112983669A

Abstract

The invention discloses an injection control method, a controller, a control system and an engine, which are applied to the engine with fuel single-point injection, wherein a plurality of groups of injection valves are arranged in an air inlet main pipe of the engine, and when part of the injection valves in the plurality of groups of injection valves are in a fault state and the engine meets the condition of executing fuel injection currently, the injection mode of the injection valve in the normal state is adjusted to match the control target of uniform distribution of fuel injection in a working cycle. The injection mode of the injection valve in the normal state at present is adjusted to enable the fuel in one working cycle to be uniformly distributed, so that the air-fuel ratio distribution of an air inlet main pipe in one working cycle keeps a relatively uniform effect, each cylinder of the engine can be uniformly covered, the condition that the air-fuel ratio is leaner when part of the cylinders work due to the fact that part of the injection valves in a plurality of groups of injection valves are in a fault state is avoided, and the problems of insufficient power and poor emission of the engine are also avoided.

Description

Injection control method, controller, control system, control device and engine

Technical Field

The invention relates to the technical field of engine fuel injection, in particular to an injection control method, a controller, a control device, a control system and an engine.

Background

The gas engine for the road generally comprises two types, namely a 4-cylinder engine and a 6-cylinder engine, wherein the single-point injection cylinder engine means that gas is injected in an air inlet manifold of the multi-cylinder engine, mixed with air and then enters each cylinder of the engine, and in order to meet the requirement of fuel injection quantity, a plurality of groups of injection valves are usually arranged on the air inlet manifold of the single-point injection cylinder engine. However, in the actual fuel injection process of the single-point injection cylinder machine, the problems that the NOx emission is deteriorated, the regulation requirement is not met, the power is insufficient and the like still easily occur to the engine.

In summary, how to solve the problems that the engine power is insufficient and the emission is deteriorated easily during the operation of the single-point injection engine has become a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The invention aims to provide an injection control method, a controller, a control device, a control system and an engine, which aim to solve the problems that the power of the engine is insufficient and the emission is deteriorated easily in the running process of a single-point injection engine.

In order to achieve the above object, the present invention provides an injection control method applied to an engine with single-point fuel injection, in which a plurality of sets of injection valves are disposed in an intake manifold, the control method including:

and when some injection valves in the plurality of groups of injection valves are in a fault state and the engine currently meets the condition of executing fuel injection, adjusting the injection mode of the injection valve currently in a normal state to match the control target of uniform distribution of fuel injection in one working cycle.

Preferably, the injection mode of the injection valve currently in the normal state is adjusted according to the following steps:

the fuel amount to be injected in one working cycle of the engine is evenly distributed to each injection valve which is in a normal state currently;

and controlling each injection valve which is in the normal state to inject once in one working cycle, and enabling the maximum injection duration angle which can be achieved by each injection valve which is in the normal state to be one working cycle.

on the basis of not changing the originally set single injection amount of the injection valve, the injection valve in the normal state is controlled to sequentially and circularly inject, and the total injection times of the injection valve in the normal state in one working cycle are the same as the total injection times of all the injection valves in the working cycle in the normal state.

Preferably, adjusting the injection manner of the injection valve currently in the normal state includes:

detecting the current load working condition of the engine;

if the engine is in a low-load working condition, executing a first injection mode: the fuel amount to be injected of the engine in one working cycle is evenly distributed to each injection valve which is in a normal state currently; controlling each injection valve in the normal state to inject once in one working cycle, and enabling the maximum injection continuous angle which can be achieved by each injection valve in the normal state to be one working cycle;

and if the engine is in a medium-high load working condition, executing a second injection mode: on the basis of not changing the originally set single injection quantity of the injection valve, the injection valve in the normal state is controlled to sequentially and circularly inject, and the total injection times of the injection valve in the normal state in one working cycle are the same as the total injection times of all the injection valves in the working cycle in the normal state.

Preferably, adjusting the injection manner of the injection valve currently in the normal state further includes:

and if the engine is switched from the low-load working condition to the medium-high load working condition or is switched from the medium-high load working condition to the low-load working condition, responding to the fact that the engine exits an overlarn state, and switching the first injection mode and the second injection mode.

Preferably, the engine currently satisfies the execution fuel injection condition, including: and after the engine enters the overhun state, exiting the overhun state.

Compared with the introduction content of the background technology, the injection control method is applied to the engine with single-point fuel injection, a plurality of groups of injection valves are arranged in an air inlet manifold of the engine, and the control method comprises the following steps: and when some injection valves in the plurality of groups of injection valves are in a fault state and the engine currently meets the condition of executing fuel injection, adjusting the injection mode of the injection valve currently in a normal state to match the control target of uniform distribution of fuel injection in one working cycle. In the injection control method, in the practical application process, when part of the injection valves in the multiple groups of injection valves are in a fault state and the engine currently meets the condition of executing fuel injection, the injection mode of the injection valves currently in a normal state is adjusted to enable the fuel injection in one working cycle to be uniformly distributed, so that the air-fuel ratio distribution of an air inlet main pipe in one working cycle keeps a relatively uniform effect, each cylinder of the engine can be uniformly covered, the condition that the air-fuel ratio is leaner when the part of the cylinders work due to the fact that the part of the injection valves in the multiple groups of injection valves are in the fault state is avoided, and the problems of insufficient power and poor emission of the engine are avoided.

In addition, the invention also provides a controller, which comprises a processor and a memory, wherein the memory is used for storing preset control instructions, and the preset control instructions are used for instructing the processor to adjust the injection mode of the injection valve which is currently in a normal state according to the injection control method described in any scheme. Since the above injection control method has the above technical effects, a controller for controlling the engine according to the control method should also have corresponding technical effects, which are not described herein again.

In addition, the invention also provides an injection control system, which comprises a sensor, a data transmission channel and a controller, wherein the controller is the controller described in the scheme. Since the controller has the above technical effects, the injection control system having the controller should also have corresponding technical effects, which are not described herein again.

The invention also provides an injection control device, which is applied to an engine with fuel single-point injection, wherein a plurality of groups of injection valves are arranged in an air inlet main pipe of the engine, and the control device comprises:

the judging unit is used for judging whether the working state of each injection valve is in a fault state or not and whether the fuel injection execution condition of the engine is met or not;

and the processing unit is used for acquiring the judgment result of the judgment unit, and adjusting the injection mode of the injection valve which is in the normal state at present to match the control target of uniform distribution of fuel injection in one working cycle when the judgment result indicates that part of the injection valves in the plurality of groups of injection valves are in the fault state and the engine meets the condition of executing fuel injection at present.

Since the injection control device has the same inventive concept as the injection control method, the injection control device should also have the technical effects of the injection control method, and will not be described herein again.

Besides, the invention also provides an engine, the engine is a multi-cylinder engine with single-point fuel injection, a plurality of groups of injection valves are arranged in an air inlet main pipe of the engine, the engine comprises an injection control system, and the injection control device is the injection control system described in the scheme. Similarly, the engine with the injection control system should have corresponding technical effects, and the detailed description is omitted here.

Drawings

FIG. 1 is a control schematic of an injection control method provided in an embodiment of the present invention;

FIG. 2 is a schematic diagram illustrating a first injection mode control provided in an embodiment of the present invention;

FIG. 3 is a schematic diagram of a first injection mode, which is provided in the embodiment of the present invention and takes a four-cylinder engine as an example;

FIG. 4 is a schematic injection diagram illustrating a second injection mode, which is provided in an embodiment of the present invention and is exemplified by a four-cylinder machine;

fig. 5 is a flowchart of the overall control of the injection in the third injection manner provided in the embodiment of the present invention.

Detailed Description

Based on the phenomena that the power shortage and the emission deterioration of the engine are easy to occur in the running process of the single-point injection engine, the inventor conducts intensive research and a great amount of experimental verification, and surprisingly discovers that the reasons of the power shortage and the emission deterioration of the engine are in certain connection with the failure of an injection valve in an air intake manifold.

The conclusion obtained through a large number of theories and experimental evidences is that in the actual fuel injection process of the single-point injection cylinder machine, when one group of injection valves in a plurality of groups of injection valves which are uniformly injected have faults, the uniformity of fuel of each cylinder during working can be affected, and then the mixed gas is slightly lean during working of some cylinders.

Taking a single-point injection 4-cylinder engine as an example, the working sequence is 1-3-4-2, fuel injection is sequentially executed according to the working requirements of the engine, and when one of the injection valves fails, for example, only the remaining 3 injection valves work after the 2-cylinder injection valve fails, the fuel injection cannot realize uniform coverage of 4 cylinders, so that the air-fuel ratio is lean during the working of part of cylinders, and the problems that the NOx emission deterioration does not meet the requirements of regulations, the power is insufficient and the like occur in the engine.

Based on the discovery, the invention provides an injection control method, a controller, a control device, a control system and an engine, which aim to solve the problems that the power shortage and the emission deterioration of the engine are easy to occur in the operation process of a single-point injection engine.

In order to make those skilled in the art better understand the technical solutions provided by the present invention, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

As shown in fig. 1, an embodiment of the present invention provides an injection control method, which is applied to an engine with single-point fuel injection, an intake manifold of the engine is provided with a plurality of groups of injection valves, and the control method includes:

step S101: determining that some of the plurality of injection valves are in a fault state and that the engine currently satisfies an execution fuel injection condition;

step S102: the injection mode of the injection valve currently in the normal state is adjusted to match the control target for the uniform distribution of fuel injection in one working cycle.

The specific way of determining that some of the multiple groups of injection valves are in the failure state in step S101 is as follows: acquiring relevant parameters of the working state of each injection valve in the air intake manifold, and obtaining whether the injection valve is in a fault state according to the relevant parameters of the injection valve, namely judging whether the injection valve is in a fault position, wherein the part for judging whether the injection valve is in a fault state belongs to the existing mature technical content and is not elaborated herein; the present condition that the engine satisfies the fuel injection execution condition means that at least the basic condition that the engine executes the fuel injection is satisfied, which also belongs to the prior art known by those skilled in the art and will not be described too much here.

In the injection control method, in the practical application process, when part of the injection valves in the multiple groups of injection valves are in a fault state and the engine currently meets the condition of executing fuel injection, the injection mode of the injection valves currently in a normal state is adjusted to enable the fuel injection in one working cycle to be uniformly distributed, so that the air-fuel ratio distribution of an air inlet main pipe in one working cycle keeps a relatively uniform effect, each cylinder of the engine can be uniformly covered, the condition that the air-fuel ratio is leaner when the part of the cylinders work due to the fact that the part of the injection valves in the multiple groups of injection valves are in the fault state is avoided, and the problems of insufficient power and poor emission of the engine are avoided.

In order to facilitate the adjustment of the injection manner of the injection valve currently in the normal state in step S102, the engine may satisfy the execution fuel injection condition, and the method may further include: and after the engine enters the overlarun state, the engine exits the overlarun state. The change of the injection manner can be made smoother by setting to include this condition. Of course, it should be understood by those skilled in the art that in practical applications, other conditions for performing fuel injection need to be satisfied according to the general situation and configuration requirement of the engine for performing injection, and are not described in detail herein.

In addition, it should be noted that, as those skilled in the art can understand, the Overrun state: under the condition that the engine normally runs, if the throttle is released at the moment, other external torque requirements do not exist, and the rotating speed of the engine is larger than a certain threshold value, the working condition state of the engine at the moment is called an Overrun state, if the whole vehicle is in an Overrun working condition generally when going downhill or the throttle is released to slide freely, the engine does not spray oil at the moment, and the injection valve is in a closed state.

It should be noted that, in the foregoing step S102, the injection manner of the injection valve currently in the normal state may be adjusted in various forms, and the corresponding injection manner may be selectively configured according to different requirements.

For example, the first injection manner, that is, the injection manner of the injection valve currently in the normal state is adjusted in the foregoing step S102, as shown in fig. 2, specifically, the injection manner is completed according to the following steps:

step S201: the fuel amount to be injected in one working cycle of the engine is evenly distributed to each injection valve which is in a normal state currently;

step S202: and controlling each injection valve in the normal state to inject once in one working cycle, and enabling the maximum injection duration angle which can be achieved by each injection valve in the normal state to be one working cycle.

In step S201, the amount of fuel required by the engine in a working cycle may specifically be calculated according to relevant parameters such as the rotation speed and the required torque of the engine, and then the purpose of fuel quantity equalization is achieved by controlling the opening duration of each injection valve that is currently in the normal state.

It should be noted that, as will be understood by those skilled in the art, in step S202, the maximum injection duration angle refers to the maximum angle at which the injection valve can maintain continuous injection in one working cycle, and the injection angle during the actual operation of the injection valve is not necessarily set to the maximum injection duration angle, and in the actual application, the injection angle can be selected according to the requirement of the working condition and the requirement of the gas quantity.

In order to better understand the technical solution of the present invention, the first injection mode is specifically described below by taking a four-cylinder engine with single-point fuel injection as an example:

generally, the operation sequence of the four-cylinder engine with single-point fuel injection is 1-3-4-2, the fuel injection is performed sequentially according to the operation requirement of the engine, 4 groups of injection valves are arranged in an air inlet manifold, and when one group of the injection valves is in a failure state, the engine is controlled to perform the fuel injection according to the first embodiment. At this time, 3 sets of injection valves were used to perform control in such a manner that 3 shots of uniform injection were performed. Referring to fig. 3, in order to achieve uniform injection, 720 ° of one duty cycle is divided into 3 parts, and the injection advance angle of the injection valve of the 3 rd group is fixed to 1 cylinder top dead center; the advance angle of the injection valves of the group 2 is referenced to the position of 240 ° in fig. 3, i.e., 60 ° before the top dead center of the cylinder 2; by analogy, the advance angle of the injection valve of the 1 st group is referenced to the 480 ° position in fig. 4, i.e., 120 ° before the top dead center of the 4 cylinders. And fixing the advance angle reference, and calculating the fuel gas demand of injection according to the control demand of the engine.

For another example, the second injection mode may be adopted, that is, the injection mode of the injection valve currently in the normal state is adjusted in step S102, and the adjustment is completed according to the following steps:

on the basis of not changing the originally set single injection quantity of the injection valve, the injection valve in the normal state is controlled to sequentially and circularly inject, and the total injection times of the injection valve in the normal state in one working cycle are the same as the total injection times of all the injection valves in the working cycle in the normal state.

Similarly, in order to better understand the technical solution of the present invention, the second injection mode is specifically described below by taking a four-cylinder engine with single-point fuel injection as an example:

the working sequence of the four-cylinder engine with single-point fuel injection is 1-3-4-2, the fuel injection is sequentially executed according to the working requirement of the engine, 4 groups of injection valves are arranged in an air inlet manifold, and when one group of injection valves is in a failure state, the engine is controlled to execute the fuel injection according to a second injection mode. Wherein, the crank angle of one working cycle of the four-cylinder machine is 720 degrees, and the top dead center interval angle of every two adjacent cylinders is 180 degrees. According to the ignition sequence of 1-3-4-2, assuming that the injection advance angle is 0 degrees, if the top dead center of the cylinder No. 1 is taken as a reference, the top dead center of the cylinder No. 1 is 0 degrees, and the top dead centers of the other three cylinders are 180 degrees, 360 degrees and 540 degrees respectively. The control sequence for four injections from three actual groups of injection valves can then be carried out as schematically shown in fig. 4. As can be seen from fig. 4, the maximum injection duration angle for each set of injection valves is 540 °, and each drive cycle has two injections with one set of injection valves open.

In some specific embodiments, a third injection mode, that is, adjusting the injection mode of the injection valve currently in the normal state, may also be adopted, specifically including:

step S301: detecting the current load working condition of the engine;

step S302: if the engine is in a low-load working condition, executing a first injection mode: the fuel amount to be injected in one working cycle of the engine is evenly distributed to each injection valve which is in a normal state currently; controlling each injection valve in the normal state to inject once in one working cycle, and enabling the maximum injection continuous angle which can be achieved by each injection valve in the normal state to be one working cycle; and if the engine is in a medium-high load working condition, executing a second injection mode: on the basis of not changing the originally set single injection quantity of the injection valve, the injection valve in the normal state is controlled to sequentially and circularly inject, and the total injection times of the injection valve in the normal state in one working cycle are the same as the total injection times of all the injection valves in the working cycle in the normal state.

By adopting the third injection mode, the first injection mode and the second injection mode can be combined, the engine can be more suitable for the load working condition of the engine, and the power-on time of the injection valve can be shorter when low load is mainly considered. Because the opening of the valve needs a certain time and the closing is delayed, if the injection time is too short, the injection quantity is inaccurate, and the rotating speed of the engine is unstable, so that the power-on time of a single valve can be prolonged and the stability is increased by uniformly distributing the required gas quantity of a plurality of valves to a small quantity of valves at the time of low load. Therefore, the injection can be more reasonable, and the requirements of different working conditions of the engine can be better met.

It should be noted that, as those skilled in the art can understand, in the foregoing step S301, a specific manner of detecting the current load condition of the engine may be to determine whether the current condition of the engine meets a setting standard of a medium/high load condition corresponding to the engine according to related parameters such as a rotation speed and a required torque of the engine, where the specific setting manner of the standard is generally: the engine rotating speed is greater than or equal to a preset rotating speed threshold value, and the torque required by the engine is greater than or equal to a preset torque threshold value; if the standard is met, judging that the engine is in a middle-high load working condition at present; and if the standard is not met, judging that the engine is currently in a low-load working condition.

In a further embodiment, in the third injection mode, in order to ensure smoother switching between the first injection mode and the second injection mode and to ensure implementability of the injection valve driving mode, in order to ensure implementability of the injection valve driving mode, adjusting the injection mode of the injection valve currently in the normal state further includes: and if the engine is converted from the low-load working condition to the medium-high load working condition or from the medium-high load working condition to the low-load working condition, responding to the engine exiting the overhun state, and switching the first injection mode and the second injection mode.

For better understanding of the third injection mode provided by the present invention, the whole control flow of the control method corresponding to the third injection mode is described below with reference to a more preferable implementation mode:

referring to fig. 5, the control flow of the control method is as follows:

step S501: acquiring relevant parameters such as the rotating speed of an engine, the torque demand, the fault state of an injection valve, the over state and the like;

step S502: judging whether the fault state of the injection valve is set or not, if so, executing a step S503, otherwise, returning to the step S501;

step S503: judging whether the over state is set, if so, executing step S504; if not, returning to the step S502;

step S504: judging whether the engine meets the high-load working condition determination standard: if the engine speed is greater than or equal to the preset speed threshold and the torque required by the engine is greater than or equal to the preset torque threshold, executing step S505; if not, executing step S506;

step S505: executing a second injection mode: on the basis of not changing the originally set single injection quantity of the injection valve, controlling the injection valve in the normal state to sequentially and circularly inject, and enabling the total injection times of the injection valve in the normal state in one working cycle to be the same as the total injection times of all the injection valves in the working cycle in the normal state;

step S506: executing a first injection mode: the fuel amount to be injected in one working cycle of the engine is evenly distributed to each injection valve which is in a normal state currently; and controlling each injection valve in the normal state to inject once in one working cycle, and enabling the maximum injection continuous angle which can be achieved by each injection valve in the normal state to be one working cycle.

In addition, the invention also provides a controller, which comprises a processor and a memory, wherein the memory is used for storing preset control instructions, and the preset control instructions are used for instructing the processor to adjust the injection mode of the injection valve which is currently in a normal state according to the injection control method described in any one of the above schemes. Since the above injection control method has the above technical effects, a controller for controlling the engine according to the control method should also have corresponding technical effects, which are not described herein again.

In addition, the invention also provides an injection control system, which comprises a sensor, a data transmission channel and a controller, wherein the controller is the controller described in the scheme. The controller has the technical effects that an injection control system with the controller also has corresponding technical effects, and the controller is not described herein any more.

In addition, the invention also provides an injection control device, which is applied to an engine with fuel single-point injection, wherein a plurality of groups of injection valves are arranged in an air inlet manifold of the engine, and the control device comprises:

and the processing unit is used for acquiring a judgment result of the judgment unit, and adjusting the injection mode of the injection valve which is in the normal state at present to match a control target of uniform distribution of fuel injection in one working cycle when the judgment result indicates that part of the injection valves in the plurality of groups of injection valves are in the fault state and the engine meets the condition of executing fuel injection at present.

In addition, the invention also provides an engine, the engine is a multi-cylinder engine with single-point fuel injection, a plurality of groups of injection valves are arranged in an air inlet manifold of the engine, the engine comprises an injection control system, and the injection control device is the injection control system described in the scheme. Similarly, the engine with the injection control system should have corresponding technical effects, and the detailed description is omitted here.

It should be noted that, in general, in a multi-cylinder engine with single-point injection, the number of groups of injection valves in the intake manifold and the number of cylinders of the engine are usually the same, but it should be understood that they may be designed in a non-uniform manner, and they may be specifically configured according to actual requirements during actual application. In addition, the engine may be a four-cylinder engine, a six-cylinder engine, or another type of multi-cylinder engine, which is not limited in more detail herein.

The injection control method, the controller, the control system, the control device and the engine provided by the invention are described in detail above. It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

Note that the features described in the embodiments in the present specification may be replaced with or combined with each other. For the device or system type embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. An injection control method is applied to an engine with single-point fuel injection, a plurality of groups of injection valves are arranged in an air inlet manifold of the engine, and the control method is characterized by comprising the following steps:

when part of injection valves in the plurality of groups of injection valves are in a fault state and the engine meets the condition of executing fuel injection currently, adjusting the injection mode of the injection valve in the normal state so as to match the control target of fuel injection uniform distribution in one working cycle;

wherein adjusting the injection mode of the injection valve currently in the normal state comprises:

detecting the current load working condition of the engine;

if the engine is in a low-load working condition, executing a first injection mode: the fuel amount to be injected in one working cycle of the engine is evenly distributed to each injection valve which is in a normal state currently; controlling each injection valve in the normal state to inject once in one working cycle, and enabling the maximum injection continuous angle which can be achieved by each injection valve in the normal state to be one working cycle;

2. The injection control method according to claim 1, characterized in that adjusting the injection manner of the injection valve currently in the normal state further comprises:

3. The injection control method according to claim 1, wherein the engine currently satisfying the execution fuel injection condition includes: and after the engine enters the overlarun state, the engine exits the overlarun state.

4. A controller comprising a processor and a memory, wherein the memory is configured to store preset control instructions for instructing the processor to adjust an injection pattern of an injection valve currently in a normal state according to an injection control method according to any one of claims 1 to 3.

5. An injection control system comprising a sensor, a data transmission channel and a controller, wherein the controller is the controller of claim 4.

6. An injection control device is applied to an engine with single-point fuel injection, a plurality of groups of injection valves are arranged in an air inlet manifold of the engine, and the injection control device is characterized by comprising:

the processing unit is used for acquiring the judgment result of the judgment unit, and when the judgment result indicates that part of the injection valves in the plurality of groups of injection valves are in the fault state and the engine currently meets the condition of executing fuel injection, adjusting the injection mode of the injection valve currently in the normal state so as to match the control target of uniform distribution of fuel injection in one working cycle;

wherein, adjusting the injection mode of the injection valve which is currently in a normal state comprises:

detecting the current load working condition of the engine;

7. An engine, the engine being a multi-cylinder machine with single-point injection of fuel, a plurality of sets of injection valves being provided in an intake manifold of the engine, the engine comprising an injection control system, characterized in that the injection control system is the injection control system of claim 5.