CN106050517A - Ignition control method for spark ignition type free piston linear generators - Google Patents
Ignition control method for spark ignition type free piston linear generators Download PDFInfo
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Abstract
本发明公开的一种用于点燃式自由活塞直线发电机的点火控制方法，属于能源动力领域。由于点燃式自由活塞直线发电机在启动过程和发电过程活塞运动规律不同，本发明公开的控制方法包括如下步骤：步骤一，在启动过程采用实时活塞位移信息控制点火系统点火；步骤二，在发电过程采用实时活塞位移和速度信息控制点火系统点火。本发明要解决的技术问题是实现点燃式自由活塞直线发电机在启动和发电过程中根据活塞运动规律分别预设点火阈值点火，保证点燃式自由活塞直线发电机稳定连续运行和内燃机输出效率的提高，此外，本发明无需其他辅助系统，仅仅通过软件编程即可实现点火控制，不受活塞止点变化的影响，能确保每循环均能点燃混合气。
The invention discloses an ignition control method for an ignition type free-piston linear generator, which belongs to the field of energy and power. Since the piston movement rules of the ignition free piston linear generator are different during the start-up process and the power generation process, the control method disclosed by the present invention includes the following steps: Step 1, using real-time piston displacement information to control the ignition of the ignition system during the start-up process; Step 2, during the power generation process The process uses real-time piston displacement and speed information to control the ignition of the ignition system. The technical problem to be solved by the present invention is to realize the ignition of the ignited free-piston linear generator according to the predetermined ignition threshold according to the piston movement law in the process of starting and power generation, so as to ensure the stable and continuous operation of the ignited free-piston linear generator and the improvement of the output efficiency of the internal combustion engine , In addition, the present invention does not require other auxiliary systems, and can realize ignition control only through software programming, and is not affected by changes in the dead center of the piston, and can ensure that the mixture can be ignited every cycle.
Description
技术领域technical field
本发明涉及一种点火控制方法，尤其涉及一种用于点燃式自由活塞直线发电机的点火控制方法，属于能源动力领域。The invention relates to an ignition control method, in particular to an ignition control method for an ignition type free-piston linear generator, belonging to the field of energy and power.
背景技术Background technique
随着日益严峻的环境问题和能源供应问题的凸显，各国研究者在提高传统内燃机效率和性能的同时，亦着手研发新型能量转化装置。点燃式自由活塞直线发电机作为新型能量转换装置的一个典型代表，因其具有众多特有优势，如结构简单，能量传递路径短，功率密度高，可适用于多种燃烧模式和多种燃料适应性等众多优势，具有极大的应用前景。With the increasingly serious environmental problems and energy supply problems, researchers from various countries have started to develop new energy conversion devices while improving the efficiency and performance of traditional internal combustion engines. As a typical representative of the new energy conversion device, the ignited free-piston linear generator has many unique advantages, such as simple structure, short energy transmission path, high power density, and can be applied to various combustion modes and various fuel adaptability And many other advantages, has great application prospects.
点燃式自由活塞直线发电机是由两个自由活塞式内燃机与一个直线电机耦合而成。其工作原理是左右两侧内燃机气缸内的混合气交替点火燃烧，产生高温高压气体推动活塞及电机动子往复运动，切割磁力线，产生电能，将燃料的化学能直接转化成电能。自由活塞直线发电机在启动过程中，电机运行为电动机工作模式，电动机提供一个恒力，方向与活塞运动方向相同，推动活塞往复运动实现内燃机启动；发电过程中，电机运行在发电机工作模式，利用电机动子往复运动切割磁力线产生电能。可以发现在启动过程中，由于外力——恒定电机力的作用导致活塞在运动过程中其每循环的止点是相同的，但是在发电过程中由于没有外力作用，活塞的运行是自由的无规律的，因此其每循环的止点是不同的。针对点燃式自由活塞直线发电机而言，不同运动过程应该采用不同的点火控制方法。尤其是自由活塞直线发电机运行在发电过程，由于每循环止点位置不同，如果预设点火位置相对于该循环的止点位置过于靠前，则内燃机会过于提前点火，这样会导致内燃机输出效率和有效功均减小，甚至导致点燃式自由活塞直线发电机停机运行；如果预设点火位置相对于该循环的止点位置过于靠后，则燃烧压力降低，内燃机输出功率下降，甚至导致点燃式自由活塞直线发电机停机运行。对于点燃式自由活塞直线发电机而言，点火位置的好坏直接影响内燃机输出效率和运行的连续性。因此，对于点燃式自由活塞直线发电机而言，针对其各个工作过程需要设计一套切实可行的点火控制方法，以实现自由活塞直线发电机的稳定连续运行和内燃机输出效率的提高。The ignited free-piston linear generator is formed by coupling two free-piston internal combustion engines and a linear motor. Its working principle is that the mixed gas in the left and right cylinders of the internal combustion engine is alternately ignited and burned to generate high-temperature and high-pressure gas to push the piston and the motor mover to reciprocate, cut the magnetic field lines, generate electrical energy, and directly convert the chemical energy of the fuel into electrical energy. During the starting process of the free-piston linear generator, the motor operates in the motor working mode, and the motor provides a constant force in the same direction as the piston movement, pushing the piston to reciprocate to start the internal combustion engine; during the power generation process, the motor runs in the generator working mode, The reciprocating motion of the motor mover is used to cut the magnetic field lines to generate electric energy. It can be found that during the starting process, due to the external force—the constant motor force, the dead center of each cycle of the piston is the same during the movement process, but because there is no external force during the power generation process, the operation of the piston is free and irregular , so the end point of each cycle is different. For ignition free piston linear generators, different ignition control methods should be adopted for different motion processes. Especially when the free-piston linear generator is running in the power generation process, since the dead point position of each cycle is different, if the preset ignition position is too far ahead of the dead point position of the cycle, the internal combustion engine will be ignited too early, which will lead to a decrease in the output efficiency of the internal combustion engine. If the preset ignition position is too far behind the end point of the cycle, the combustion pressure will decrease, the output power of the internal combustion engine will decrease, and even cause the ignition type free piston linear generator to stop running. The free-piston linear generator stops running. For the ignition type free piston linear generator, the quality of the ignition position directly affects the output efficiency and the continuity of the internal combustion engine. Therefore, for the ignited free-piston linear generator, it is necessary to design a set of practical ignition control methods for each working process, so as to realize the stable and continuous operation of the free-piston linear generator and the improvement of the output efficiency of the internal combustion engine.
发明内容Contents of the invention
本发明公开的一种用于点燃式自由活塞直线发电机的点火控制方法，要解决的技术问题是实现点燃式自由活塞直线发电机在启动和发电过程中根据活塞运动规律分别预设点火阈值点火，保证点燃式自由活塞直线发电机稳定连续运行和内燃机输出效率的提高。The invention discloses an ignition control method for an ignited free-piston linear generator, and the technical problem to be solved is to realize the ignition of the ignited free-piston linear generator with preset ignition thresholds according to the piston motion law during the start-up and power generation process , to ensure the stable and continuous operation of the ignited free-piston linear generator and the improvement of the output efficiency of the internal combustion engine.
本发明的目的是通过下述技术方案实现的。The purpose of the present invention is achieved through the following technical solutions.
所述的点燃式自由活塞直线发电机是由两个自由活塞式内燃机与一个直线电机耦合而成。两个自由活塞式内燃机对称布置在直线电机左右两侧。所述的两个自由活塞式内燃机分别定义为左侧内燃机和右侧内燃机。其工作原理是左右两侧内燃机气缸内的混合气交替点火燃烧，产生高温高压气体推动活塞及电机动子往复运动，切割磁力线，产生电能，将燃料的化学能直接转化成电能。The ignition type free-piston linear generator is formed by coupling two free-piston internal combustion engines and a linear motor. Two free-piston internal combustion engines are symmetrically arranged on the left and right sides of the linear motor. The two free-piston internal combustion engines are respectively defined as a left internal combustion engine and a right internal combustion engine. Its working principle is that the mixed gas in the left and right cylinders of the internal combustion engine is alternately ignited and burned to generate high-temperature and high-pressure gas to push the piston and the motor mover to reciprocate, cut the magnetic field lines, generate electrical energy, and directly convert the chemical energy of the fuel into electrical energy.
本发明公开的一种用于点燃式自由活塞直线发电机的点火控制方法，由于点燃式自由活塞直线发电机在启动过程和发电过程活塞运动规律不同，根据活塞运动规律在启动过程采用实时活塞位移信息控制点火系统点火，在发电过程采用实时活塞位移和速度信息控制点火系统点火。The invention discloses an ignition control method for an ignited free-piston linear generator. Since the piston motion law of the ignited free-piston linear generator is different in the start-up process and the power generation process, real-time piston displacement is adopted in the start-up process according to the piston motion law. Information controls the ignition of the ignition system, and uses real-time piston displacement and speed information to control the ignition of the ignition system during the power generation process.
本发明公开的一种用于点燃式自由活塞直线发电机的点火控制方法，具体包括如下步骤：An ignition control method for an ignition-type free-piston linear generator disclosed by the present invention specifically includes the following steps:
步骤一：在启动过程采用实时活塞位移信息控制点火系统点火。Step 1: Use real-time piston displacement information to control the ignition of the ignition system during the start-up process.
点燃式自由活塞直线发电机在启动过程中，由于活塞止点位置固定，将活塞止点作为基准来预设点火位移阈值。即当点燃式自由活塞直线发电机的测控系统检测到左侧内燃机活塞位移达到预设点火位移阈值，测控系统发出指令给左侧内燃机点火系统，火花塞点燃左侧内燃机气缸内混合气体，推动活塞及电机动子向右运行，当点燃式自由活塞直线发电机的测控系统检测到右侧内燃机活塞位移达到预设点火位移阈值，测控系统发出指令给右侧内燃机点火系统，火花塞点燃右侧内燃机气缸内混合气体，推动活塞及电机动子向左运行，如此左、右内燃机交替进行点火。所述的预设点火位移阈值x0是在活塞止点之前逼近止点的位置，距止点距离大小为x0。所述的x0大小根据点燃式自由活塞直线发电机运行工况而预先设定。进而能够确保点燃式自由活塞直线发电机连续稳定运行和较高内燃机输出效率。During the starting process of the ignited free-piston linear generator, since the position of the dead point of the piston is fixed, the dead point of the piston is used as a reference to preset the ignition displacement threshold. That is, when the measurement and control system of the ignited free-piston linear generator detects that the piston displacement of the left internal combustion engine reaches the preset ignition displacement threshold, the measurement and control system sends an instruction to the ignition system of the left internal combustion engine, and the spark plug ignites the mixed gas in the cylinder of the left internal combustion engine, pushing the piston and The motor mover runs to the right. When the measurement and control system of the ignited free-piston linear generator detects that the piston displacement of the right internal combustion engine reaches the preset ignition displacement threshold, the measurement and control system sends an instruction to the ignition system of the right internal combustion engine, and the spark plug ignites in the cylinder of the right internal combustion engine. The mixed gas pushes the piston and the motor mover to move to the left, so that the left and right internal combustion engines are ignited alternately. The preset ignition displacement threshold x 0 is a position close to the dead center before the dead center of the piston, and the distance from the dead center is x 0 . The size of x 0 is preset according to the operating conditions of the ignited free-piston linear generator. Furthermore, the continuous and stable operation of the ignition type free-piston linear generator and the higher output efficiency of the internal combustion engine can be ensured.
步骤二：在发电过程采用实时活塞位移和速度信息控制点火系统点火。Step 2: Use real-time piston displacement and speed information to control the ignition of the ignition system during the power generation process.
点燃式自由活塞直线发电机在发电过程中，由于每循环活塞止点位置变化，所以不能将活塞止点作为基准来预设点火位移阈值。因此根据点燃式自由活塞直线发电机活塞运动规律，采用活塞位移和速度信号作为预设点火速度阈值，当点燃式自由活塞直线发电机的测控系统检测到左侧内燃机活塞速度达到预设点火速度阈值，测控系统发出指令给左侧内燃机点火系统，火花塞点燃左侧内燃机气缸内混合气体，推动活塞及电机动子向右运行，当点燃式自由活塞直线发电机的测控系统检测到右侧内燃机活塞速度达到预设点火速度阈值，测控系统发出指令给右侧内燃机点火系统，火花塞点燃右侧内燃机气缸内混合气体，推动活塞及电机动子向左运行，如此左、右侧内燃机交替进行点火。所述的预设点火速度阈值v0指到达活塞止点之前的活塞运动速度。所述的v0大小根据点燃式自由活塞直线发电机运行工况而预先设定。进而能够确保点燃式自由活塞直线发电机连续稳定运行和较高内燃机输出效率。During the power generation process of the ignited free-piston linear generator, since the position of the dead center of the piston changes every cycle, the ignition displacement threshold cannot be preset based on the dead center of the piston. Therefore, according to the piston motion law of the ignited free piston linear generator, the piston displacement and speed signals are used as the preset ignition speed threshold. When the measurement and control system of the ignited free piston linear generator detects that the piston speed of the left internal combustion engine reaches the preset ignition speed threshold , the measurement and control system sends instructions to the ignition system of the left internal combustion engine, the spark plug ignites the mixed gas in the cylinder of the left internal combustion engine, and pushes the piston and the motor mover to run to the right. When the preset ignition speed threshold is reached, the measurement and control system sends an instruction to the ignition system of the right internal combustion engine. The spark plug ignites the mixed gas in the cylinder of the right internal combustion engine, and pushes the piston and the motor mover to the left, so that the left and right internal combustion engines ignite alternately. The preset ignition speed threshold v 0 refers to the speed of the piston before reaching the dead center of the piston. The value of v 0 is preset according to the operating conditions of the ignited free-piston linear generator. Furthermore, the continuous and stable operation of the ignition type free-piston linear generator and the higher output efficiency of the internal combustion engine can be ensured.
有益效果：Beneficial effect:
1、本发明公开的一种用于点燃式自由活塞直线发电机的点火控制方法，针对点燃式自由活塞直线发电机在启动过程中每循环活塞止点不变的特点，在启动过程采用实时活塞位移信息控制点火系统点火，通过实时调整点火位置，可保证点燃式自由活塞直线发电机稳定连续运行和内燃机输出效率的提高。1. An ignition control method for an ignited free-piston linear generator disclosed in the present invention, aiming at the fact that the dead point of each cycle of the ignited free-piston linear generator does not change during the start-up process, a real-time piston is adopted in the start-up process. The displacement information controls the ignition of the ignition system, and by adjusting the ignition position in real time, it can ensure the stable and continuous operation of the ignited free-piston linear generator and the improvement of the output efficiency of the internal combustion engine.
2、本发明公开的一种用于点燃式自由活塞直线发电机的点火控制方法，针对点燃式自由活塞直线发电机在发电过程中每循环活塞止点变化的特点，所以不能将止点作为基准来预设点火位移阈值。因此，在发电过程采用实时活塞位移和速度信息控制点火系统点火，可保证点燃式自由活塞直线发电机的稳定连续运行及其性能的提高。2. An ignition control method for an ignited free-piston linear generator disclosed in the present invention is aimed at the characteristics of the change of the dead point of the piston in each cycle of the ignited free-piston linear generator during the power generation process, so the dead point cannot be used as a benchmark to preset the ignition displacement threshold. Therefore, using real-time piston displacement and speed information to control the ignition of the ignition system during the power generation process can ensure the stable and continuous operation of the ignited free-piston linear generator and its performance improvement.
3、本发明公开的一种用于点燃式自由活塞直线发电机的点火控制方法，点火控制方法简单可靠，无需其他辅助系统，并且仅仅通过软件编程即可实现点燃式自由活塞直线发电机在不同工作过程的点火控制，并且不受活塞止点变化的影响，能确保每循环均能点燃混合气。3. The present invention discloses an ignition control method for an ignition-type free-piston linear generator. The ignition control method is simple and reliable, without the need for other auxiliary systems, and only through software programming can the ignition-type free-piston linear generator be used in different The ignition control of the working process is not affected by the change of the dead center of the piston, which can ensure that the mixture can be ignited every cycle.
附图说明Description of drawings
图1为本发明的点燃式自由活塞直线发电机结构示意图；Fig. 1 is the structural representation of ignition type free-piston linear generator of the present invention;
图2为本发明的点燃式自由活塞直线发电机点火时刻的说明图；Fig. 2 is the explanatory diagram of ignition moment of ignition type free-piston linear generator of the present invention;
图3为本发明的点燃式自由活塞直线发电机在启动过程的点火控制原理图；Fig. 3 is the ignition control schematic diagram of the ignition type free-piston linear generator of the present invention in the starting process;
图4为本发明的点燃式自由活塞直线发电机在发电过程的点火控制原理图。Fig. 4 is a schematic diagram of the ignition control of the ignition-type free-piston linear generator in the power generation process of the present invention.
具体实施方式detailed description
下面结合附图和实施例对本发明作进一步说明。The present invention will be further described below in conjunction with drawings and embodiments.
实施例1：Example 1:
本实施例所述的点燃式自由活塞直线发电机是由两个自由活塞式内燃机与一个直线电机耦合而成。两个自由活塞式内燃机对称布置在直线电机左右两侧。所述的两个自由活塞式内燃机分别定义为左侧内燃机和右侧内燃机。其工作原理是左右两侧内燃机气缸的混合气交替点火燃烧，产生高温高压气体推动活塞及电机动子往复运动，切割磁力线，产生电能，将燃料的化学能直接转化成电能。如图1所示。The ignition-type free-piston linear generator described in this embodiment is formed by coupling two free-piston internal combustion engines and a linear motor. Two free-piston internal combustion engines are symmetrically arranged on the left and right sides of the linear motor. The two free-piston internal combustion engines are respectively defined as a left internal combustion engine and a right internal combustion engine. Its working principle is that the mixed gas in the left and right cylinders of the internal combustion engine is alternately ignited and burned to generate high-temperature and high-pressure gas to push the piston and the motor mover to reciprocate, cut the magnetic field lines, generate electrical energy, and directly convert the chemical energy of the fuel into electrical energy. As shown in Figure 1.
本实施例公开的一种用于点燃式自由活塞直线发电机的点火控制方法，针对点燃式自由活塞直线发电机在运行过程中，包括如下步骤：An ignition control method for an ignition-type free-piston linear generator disclosed in this embodiment includes the following steps during the operation of the ignition-type free-piston linear generator:
步骤零：定义活塞、缸盖位置关系和活塞位移x、速度v的方向。Step zero: Define the positional relationship between the piston and the cylinder head, and the direction of piston displacement x and velocity v.
设定一个中点位置xmiddle＝0，如图1所示。即左侧缸盖到左侧活塞的距离与右侧缸盖到右侧活塞的距离是相等的，并且当活塞从中点向右运行时，即活塞位移x＞xmiddle；当活塞从中点向左运行时，即活塞位移x＜xmiddle。设定活塞速度v，当活塞向右运行时速度v大小为正，当活塞向左运行时速度v大小为负，如图1所示。即当右侧活塞从下止点向上止点运行或者左侧活塞从上止点向下止点运行时，即活塞速度v＞0；当右侧活塞从上止点向下止点运行或者左侧活塞从下止点向上止点运行时，即活塞速度v＜0。如图2所示。Set a midpoint position x middle =0, as shown in FIG. 1 . That is, the distance from the left cylinder head to the left piston is equal to the distance from the right cylinder head to the right piston, and when the piston moves from the midpoint to the right, the piston displacement x>x middle ; when the piston moves from the midpoint to the left During operation, that is, piston displacement x<x middle . Set the piston speed v, when the piston runs to the right, the speed v is positive, and when the piston runs to the left, the speed v is negative, as shown in Figure 1. That is, when the right piston runs from the bottom dead center to the top dead center or the left piston runs from the top dead center to the bottom dead center, that is, the piston speed v>0; when the right piston runs from the top dead center to the bottom dead center or the left When the side piston runs from the bottom dead center to the top dead center, that is, the piston speed v<0. as shown in picture 2.
步骤一：在启动过程采用实时活塞位移x信息控制点火系统点火。Step 1: Use the real-time piston displacement x information to control the ignition of the ignition system during the start-up process.
点燃式自由活塞直线发电机在启动过程中电机提供一个与活塞运行方向相同的恒力推动活塞往复运动，以实现点燃式自由活塞直线发电机的顺利启动，由于外力——恒定电机力的作用导致每循环活塞止点是相同的，所以可以以止点作为基准来预设点火位置。如图3所示，在启动过程中，点燃式自由活塞直线发电机的测控系统(测试与控制系统)获取当前活塞及动子的实时参数，所述的实时参数指位移x和速度v。当测控系统监测到右侧活塞的位移x为正时，即x＞xmiddle，表明右侧气缸准备点火，当测控系统监测到活塞的位置达到预设点火位移阈值时，即x≥x0，测控系统发出一个指令给右侧内燃机点火系统，火花塞点燃右侧气缸内混合气体，推动活塞及电机动子向左运行。During the starting process of the ignited free-piston linear generator, the motor provides a constant force in the same direction as the piston to push the piston to reciprocate, so as to realize the smooth start of the ignited free-piston linear generator. The dead center of the piston is the same every cycle, so it can be used as a reference to preset the ignition position. As shown in Figure 3, during the start-up process, the measurement and control system (test and control system) of the ignited free-piston linear generator obtains the real-time parameters of the current piston and mover, and the real-time parameters refer to displacement x and velocity v. When the measurement and control system detects that the displacement x of the right piston is positive, that is, x>x middle , it indicates that the right cylinder is ready to ignite. When the measurement and control system detects that the position of the piston reaches the preset ignition displacement threshold, that is, x≥x 0 , The measurement and control system sends a command to the ignition system of the right internal combustion engine, and the spark plug ignites the mixed gas in the right cylinder, pushing the piston and the motor mover to the left.
当测控系统监测到活塞的位移x为负时，即x＜xmiddle，表明左侧气缸准备点火，当测控系统监测到左侧活塞的位置达到预设点火位移阈值时，即x≤-x0，测控系统发出一个指令给左侧内燃机点火系统，火花塞点燃左侧内燃机气缸内混合气体，推动活塞及电机动子向右运行，如此左、右内燃机交替进行点火。点燃式自由活塞直线发电机在启动过程中，按照此点火控制方法，左右内燃机依次点火，实现点燃式自由活塞直线发电机的稳定连续运行。并且，点燃式自由活塞直线发电机运行在不同工况时，该点火控制方法中预设点火位移阈值x0可根据运行工况的不同做出适时调整，保证点燃式自由活塞直线发电机的稳定连续运行及其性能的提高。When the measurement and control system detects that the displacement x of the piston is negative, that is, x<x middle , it indicates that the left cylinder is ready to ignite. When the measurement and control system detects that the position of the left piston reaches the preset ignition displacement threshold, that is, x≤-x 0 , the measurement and control system sends a command to the ignition system of the left internal combustion engine, the spark plug ignites the mixed gas in the cylinder of the left internal combustion engine, and pushes the piston and the motor mover to run to the right, so that the left and right internal combustion engines ignite alternately. During the start-up process of the ignition-type free-piston linear generator, according to the ignition control method, the left and right internal combustion engines are ignited in sequence to realize the stable and continuous operation of the ignition-type free-piston linear generator. Moreover, when the ignition type free-piston linear generator operates under different working conditions, the preset ignition displacement threshold x 0 in the ignition control method can be adjusted in time according to different operating conditions to ensure the stability of the ignition type free-piston linear generator Continuous operation and its performance improvement.
步骤二：在发电过程采用实时活塞位移x和速度v信息控制点火系统点火。Step 2: During the power generation process, real-time piston displacement x and velocity v information is used to control the ignition of the ignition system.
点燃式自由活塞直线发电机在发电过程中，由于没有电机推力作用于活塞，这导致活塞的运行是自由的无规律的，因此每循环活塞止点是不同的。所以，在发电过程中不能以止点作为基准来预设点火时刻。根据点燃式自由活塞直线发电机活塞运动规律，以速度v作为基准预设点火时刻，以实现每循环内燃机的顺利点火和性能的提高。如图4所示，在发电过程中，点燃式自由活塞直线发电机的测控系统(测试与控制系统)获取当前活塞及动子的实时参数，所述的实时参数指位移x和速度v。当测控系统监测到活塞的位移为正时，即x＞xmiddle，表明右侧内燃机气缸准备点火，然后当测控系统监测到活塞的速度小于预设点火速度阈值时，即v＜v0，测控系统发出指令给右侧内燃机点火系统，火花塞点燃右侧气缸内混合气体，推动活塞及电机动子向左运行。During the power generation process of the ignited free-piston linear generator, since there is no motor thrust acting on the piston, this causes the piston to run freely and irregularly, so the dead point of the piston is different in each cycle. Therefore, the ignition timing cannot be preset with the dead center as a reference during the power generation process. According to the piston motion law of the ignited free-piston linear generator, the ignition time is preset with the speed v as the reference, so as to realize the smooth ignition and performance improvement of the internal combustion engine in each cycle. As shown in Figure 4, during the power generation process, the measurement and control system (test and control system) of the ignited free piston linear generator obtains the real-time parameters of the current piston and mover, and the real-time parameters refer to displacement x and velocity v. When the measurement and control system detects that the displacement of the piston is positive, that is, x>x middle , it indicates that the right internal combustion engine cylinder is ready to ignite, and then when the measurement and control system detects that the speed of the piston is less than the preset ignition speed threshold, that is, v<v 0 The system sends instructions to the ignition system of the internal combustion engine on the right, and the spark plug ignites the mixed gas in the cylinder on the right, pushing the piston and the motor mover to the left.
当测控系统监测到活塞的位移为负时，即x＜xmiddle，表明左侧内燃机气缸准备点火，然后当测控系统监测到活塞的速度大于预设点火速度阈值v0时，即v＞-v0，测控系统发出指令给左侧内燃机点火系统，火花塞点燃左侧气缸内混合气体，推动活塞及电机动子向右运行。如此左、右侧内燃机交替进行点火。点燃式自由活塞直线发电机在发电过程中，按照此点火控制方法，左、右侧内燃机依次点火，实现点燃式自由活塞直线发电机的稳定连续运行。并且，点燃式自由活塞直线发电机运行在不同工况时，该点火控制方法中预设点火速度阈值v0可根据运行工况的不同做出适时调整，实现点燃式自由活塞直线发电机的稳定连续运行及其性能的提高。When the measurement and control system detects that the displacement of the piston is negative, that is, x<x middle , it indicates that the left internal combustion engine cylinder is ready to ignite, and then when the measurement and control system detects that the piston speed is greater than the preset ignition speed threshold v 0 , that is, v>-v 0 , the measurement and control system sends an instruction to the ignition system of the left internal combustion engine, and the spark plug ignites the mixed gas in the left cylinder, pushing the piston and the motor mover to the right. In this way, the left and right internal combustion engines are ignited alternately. During the power generation process of the ignited free-piston linear generator, according to the ignition control method, the left and right internal combustion engines are ignited sequentially to realize the stable and continuous operation of the ignited free-piston linear generator. Moreover, when the ignition type free-piston linear generator is running under different working conditions, the preset ignition speed threshold v 0 in the ignition control method can be adjusted in time according to different operating conditions, so as to realize the stability of the ignition type free-piston linear generator Continuous operation and its performance improvement.
需要说明，以上所述仅为本发明的具体实施例而已，并不用于限定本发明的保护范围，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。It should be noted that the above descriptions are only specific embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are Should be included within the protection scope of the present invention.
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