Engine fuel multiple injection control method
阅读说明：本技术 发动机燃油多次喷射控制方法 (Engine fuel multiple injection control method ) 是由 王嘉炜 张天翼 于 2021-07-30 设计创作，主要内容包括：本发明公开了一种发动机燃油多次喷射控制方法,具体包括如下步骤：第一步,进入曲轴中断,记录时间点T-(C0)；第二步,判断曲轴的齿号是否为K；如果是,更新齿号为K1,否者,进入第三步,其中,齿号为K代表的上一循环曲轴位置齿号为上止点；第三步,计算喷油延时时间T-d；第四步,延时时间为T-1时,喷油嘴打开；第五步,延时时间为T-2时,喷油嘴关闭；第六步,延时时间为T-3时,喷油嘴打开；第七步,延时时间为T-4时,喷油嘴关闭。本发明能够实现发动机燃油多次喷射,使发动机的燃油燃烧充分,并减小发动机发生爆震的风险。(The invention discloses a method for controlling multiple fuel injection of an engine, which specifically comprises the following steps: first, entering crankshaft interrupt, recording time point T C0 (ii) a Secondly, judging whether the tooth number of the crankshaft is K or not; if yes, updating the tooth number K1, otherwise, entering a third step, wherein the tooth number of the crankshaft position in the last cycle represented by the tooth number K is the top dead center; thirdly, calculating the fuel injection delay time T d (ii) a The fourth step, the delay time is T 1 When the oil nozzle is opened; the fifth step, the delay time is T 2 When the fuel injection nozzle is closed; the sixth step, the delay time is T 3 When the oil nozzle is opened; step seven, the delay time is T 4 At this time, the fuel injector is closed. The invention can realize multiple fuel injection of the engine, fully combust the fuel of the engine and reduce the risk of knocking of the engine.)
1. A fuel multi-injection control method for an engine is characterized by comprising the following steps:
first, entering crankshaft interrupt, recording time point TC0；
Secondly, judging whether the tooth number of the crankshaft is K or not; if yes, updating the tooth number K1, otherwise, entering a third step, wherein the tooth number of the crankshaft position in the last cycle represented by the tooth number K is the top dead center;
thirdly, calculating the fuel injection delay time Td；
The fourth step, the delay time is T1When the oil nozzle is opened;
the fifth step, the delay time is T2When the fuel injection nozzle is closed;
the sixth step, the delay time is T3When the oil nozzle is opened;
step seven, the delay time is T4When the fuel injection nozzle is closed;
wherein, T1＝TC0+Td，T2＝T1+Tf，T3＝T2+Tfa，T4＝T3+Ta，Tf(ms) fuel injection pulsewidth, Tfa(ms) is the interval between two injections, Ta(ms) is the second injection pulsewidth.
2. According toThe engine fuel multiple injection control method of claim 1,
where 6 ° - (α + β) mod (6 °) is the angle corresponding to the interval into which the interruption to the opening of the injection nozzle occurs.
3. The engine fuel multiple injection control method according to claim 2,
alpha is the advance angle of oil injection, and n (rpm) is the rotation speed.
Technical Field
The invention relates to the technical field of engines, in particular to a method for controlling multiple fuel injection of an engine.
Background
The engine mainly converts chemical energy of fuel oil into mechanical energy to realize power output and provide power for the whole vehicle. The fuel system of an engine supplies fuel to the engine to mix with air to form a combustible mixture, primarily as required by the operating conditions of the engine.
The piston ignition type engine has the advantages of simple structure and high specific power. With the increase of power requirement, the compression ratio of the engine is continuously improved, and the engine is easy to generate phenomena of incomplete combustion, knocking and the like.
Disclosure of Invention
The invention aims to solve the problems that the existing engine is easy to produce incomplete combustion and knock, and provides a fuel oil multi-injection control method for the engine.
In order to achieve the purpose, the invention adopts the following technical scheme: the method for controlling the multiple fuel injection of the engine specifically comprises the following steps:
first, entering crankshaft interrupt, recording time point TC0；
Secondly, judging whether the tooth number of the crankshaft is K or not; if yes, updating the tooth number K1, otherwise, entering a third step, wherein the tooth number of the crankshaft position in the last cycle represented by the tooth number K is the top dead center;
thirdly, calculating the fuel injection delay time Td；
The fourth step, the delay time is T1When the oil nozzle is opened;
the fifth step, the delay time is T2When the fuel injection nozzle is closed;
the sixth step, the delay time is T3When the oil nozzle is opened;
step seven, the delay time is T4When the fuel injection nozzle is closed;
wherein, T1＝TC0+Td，T2＝Tl+Tf，T3＝T2+Tfa，T4＝T3+Ta，Tf(ms) fuel injection pulsewidth, Tfa(ms) is the interval between two injections, Ta(ms) is the second injection pulsewidth.
In particular, the method comprises the following steps of,
where 6 ° - (α + β) mod (6 °) is the angle corresponding to the interval into which the interruption to the opening of the injection nozzle occurs.
In particular, the method comprises the following steps of,
alpha is the advance angle of oil injection, and n (rpm) is the rotation speed.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that: the fuel oil of the engine can be injected for multiple times, so that the fuel oil of the engine is fully combusted, and the risk of knocking of the engine is reduced.
Drawings
FIG. 1 is a block diagram of a method for controlling multiple injections of fuel into an engine according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
The control strategy adopted by the invention is to judge the tooth number firstly and then calculate the delay time, and the oil injection advance angle is assumed to be alpha and the oil injection pulse width is assumed to be Tf(ms) two injection intervals of Tfa(ms) second injection pulsewidth is Ta(ms), the top dead center is number k teeth, the current rotating speed is n (rpm), firstly, the total time from the opening of the oil nozzle to the closing of the oil nozzle is converted into the corresponding angle beta under the current rotating speed, then:
then calculating the tooth number opposite to the crankshaft position sensor when the oil injector is started,
when the tooth number of the crankshaft position in a certain cycle is the top dead center k, the software updates the tooth number k of the oil injection in the next cycle in the interruption of the crankshaft1. When the crankshaft position reaches the tooth number k1When the software enters the crankshaft interrupt, the time point at the moment is set as TC0In the interruption, the interval from the interruption to the opening of the fuel injection nozzle, namely the time delay needs to be calculated, and the time delay is set to be Td(ms), then:
where 6 ° - (α + β) mod (6 °) is the angle corresponding to the interval into which the interruption to the opening of the injection nozzle occurs. Then when the time point is T1＝TC0+TdWhen the output is successful, the single chip microcomputer sends a fuel injector starting signal; when the time point is T2＝T1+TfWhen the control signal of the oil nozzle is in a low level, the oil nozzle is closed; when the time point is T3＝T2+TfaWhen the oil nozzle is opened again; when the time point is T4＝T3+TaThe fuel injector is closed.
Referring to fig. 1, the engine fuel multi-injection control method of the invention specifically comprises the following steps:
step S1, entering crankshaft interrupt, recording time point TC0；
Step S2, judging whether the tooth number of the crankshaft is K;
if yes, updating the tooth number to be K1, otherwise, entering the step S3;
the crankshaft comprises a crankshaft position signal panel, the crankshaft position signal panel is arranged at the front end of the crankshaft and can rotate along with the crankshaft, a plurality of signal teeth are arranged on the crankshaft position signal panel and have tooth numbers, and the tooth number represented by K is the top dead center of the last-cycle crankshaft position tooth number.
Step S3, calculating the fuel injection delay time Td；
Step S4, the delay time is T1When the oil nozzle is opened;
step S5, the delay time is T2When the fuel injection nozzle is closed;
step S6, the delay time is T3When the oil nozzle is opened;
step S7, the delay time is T4At this time, the fuel injector is closed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
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