阅读说明：本技术 一种控制燃油喷射温度的装置 (Device for controlling fuel injection temperature ) 是由 张景宇 张周 李雁飞 马骁 徐宏明 帅石金 于 2019-09-20 设计创作，主要内容包括：本说明书公开一种控制燃油喷射温度的装置,包括：进油管路、喷油器、喷油器压台、压台加热器、燃油温度传感器、压台温度控制器、喷油器底座、喷油器温度传感器、底座加热器、底座温度控制器,其中：该喷油器压台内设有储油腔,该进油管路的末端与该储油腔连通；该喷油器通过该喷油器压台固定在该喷油器底座上,该喷油器的进油管接头与该储油腔连通；该压台加热器安装在该喷油器压台内；该燃油温度传感器安装在该储油腔内；该底座加热器安装在该喷油器底座内；该喷油器温度传感器安装在该喷油器表面。本说明书公开的装置通过对喷油器实验中燃油温度和喷油器温度的控制,实现了对燃油喷射温度的准确控制。(The present specification discloses an apparatus for controlling fuel injection temperature, comprising: advance oil pipe way, sprayer pressure platform, pressure platform heater, fuel temperature sensor, pressure platform temperature controller, sprayer base, sprayer temperature sensor, base heater, base temperature controller, wherein: an oil storage cavity is arranged in the oil injector pressure table, and the tail end of the oil inlet pipeline is communicated with the oil storage cavity; the oil sprayer is fixed on the oil sprayer base through the oil sprayer pressing table, and an oil inlet pipe joint of the oil sprayer is communicated with the oil storage cavity; the pressure platform heater is arranged in the oil sprayer pressure platform; the fuel temperature sensor is arranged in the oil storage cavity; the base heater is arranged in the oil sprayer base; the injector temperature sensor is mounted to the injector face. The device disclosed by the specification realizes accurate control of the fuel injection temperature through controlling the fuel temperature and the fuel injector temperature in the fuel injector experiment.)

1. An apparatus for controlling a fuel injection temperature, comprising: advance oil pipe way, sprayer pressure platform, pressure platform heater, fuel temperature sensor, pressure platform temperature controller, sprayer base, sprayer temperature sensor, base heater, base temperature controller, wherein:

an oil storage cavity is formed in the oil sprayer pressure table, and the tail end of the oil inlet pipeline is communicated with the oil storage cavity; the oil sprayer is fixed in the oil sprayer base through the oil sprayer pressing table, and an oil inlet pipe joint of the oil sprayer is communicated with the oil storage cavity; the pressure platform heater is arranged in the oil sprayer pressure platform; the fuel temperature sensor is arranged in the oil storage cavity; the base heater is arranged in the oil sprayer base; the fuel injector temperature sensor is arranged on the surface of the fuel injector;

the platen temperature controller receives a first measured temperature sent by the fuel oil temperature sensor, compares the first measured temperature with a set target temperature, and sends a first heating control signal to the platen heater according to a comparison result;

and the base temperature controller receives a second measured temperature sent by the fuel injector temperature sensor, compares the second measured temperature with a set target temperature, and sends a second heating control signal to the base heater according to a comparison result.

2. The apparatus of claim 1, wherein the platen temperature controller receives a first measured temperature from the fuel temperature sensor, calculates a heating power of the platen heater according to a difference between the first measured temperature and a set target temperature, and sends a first heating control signal to the platen heater;

and the base temperature controller receives a second measured temperature sent by the fuel injector temperature sensor, makes a difference between the second measured temperature and a set target temperature, calculates the heating power of the base heater according to the difference value, and sends a second heating control signal to the base heater.

3. The apparatus of claim 1, wherein when the difference between the first measured temperature of the fuel temperature sensor received by the platen temperature controller and the target temperature is less than a set threshold, the platen heater is controlled to perform the holding heating at a preset first power.

4. The apparatus according to claim 1, wherein when the difference between the second measured temperature of the injector temperature sensor received by the pedestal temperature controller and the target temperature is smaller than a set threshold, the pedestal heater is controlled to perform the heat preservation heating at a preset second power.

5. The device according to claim 1, characterized in that the injector is detachably connected to the injector platen, and the injector is detachably connected to the injector base.

6. The apparatus of claim 1, wherein the platen heater is an electrical heating rod.

7. The apparatus of claim 1, wherein the pedestal heater is an electrical heating rod.

8. The device of claim 6, wherein the number of the electric heating rods is multiple, the electric heating rods are respectively inserted into the slots in the fuel injector pressure table, the slots are uniformly arranged around the fuel storage cavity, and the electric heating rods are matched with the slots in size.

9. The device of claim 7, wherein the number of the electric heating rods is multiple, the electric heating rods are respectively inserted into the grooves in the base of the fuel injector, the grooves are uniformly arranged around the fuel injector, and the electric heating rods are matched with the grooves in size.

10. The apparatus of claim 1 wherein said fuel injector pressure land is removably fixedly attached to said fuel injector base.

Technical Field

The specification relates to the field of internal combustion engines, in particular to a device for controlling fuel injection temperature in a fuel injector experiment.

Background

In the field of internal combustion engines, the application of in-cylinder direct injection technology realizes low fuel consumption and high power output of the engine and improves the fuel economy. In a combustion system of a direct injection technology, an oil injector is arranged in a cylinder body, fuel oil is directly injected into a cylinder, and the purpose of combustion is achieved by utilizing air flow in the cylinder and the fuel atomization effect on the surface of a piston. In the actual engine operation condition, the oil sprayer sprays hot fuel except for cold start, so that the effect of fuel atomization and evaporation can be obviously improved, and the improvement of economy and environmental protection of combustion is facilitated. How to reduce controllable thermal state fuel injection through an experimental device is the key of the experimental accuracy of the fuel injector.

In the existing common thermal state fuel injection experimental device, the fuel temperature inevitably drops in the injection flowing process and the amplitude of temperature change is not easy to measure, so that the fuel temperature at the outlet of the fuel injector has larger deviation with the temperature required by the experiment, the temperature at the outlet of the experimental fuel injection of the fuel injector cannot be accurately controlled, uncertain factors are brought to further study the spray characteristics, and the reliability of the spray experiment conclusion is reduced.

Disclosure of Invention

The present specification provides an apparatus for controlling fuel injection temperature that overcomes at least one technical problem in the prior art.

To achieve the above object, the present specification provides an apparatus for controlling a fuel injection temperature, comprising: advance oil pipe way, sprayer pressure platform, pressure platform heater, fuel temperature sensor, pressure platform temperature controller, sprayer base, sprayer temperature sensor, base heater, base temperature controller, wherein: an oil storage cavity is formed in the oil sprayer pressure table, and the tail end of the oil inlet pipeline is communicated with the oil storage cavity; the oil sprayer is fixed in the oil sprayer base through the oil sprayer pressing table, and an oil inlet pipe joint of the oil sprayer is communicated with the oil storage cavity; the pressure platform heater is arranged in the oil sprayer pressure platform; the fuel temperature sensor is arranged in the oil storage cavity; the base heater is arranged in the oil sprayer base; the fuel injector temperature sensor is arranged on the surface of the fuel injector; the platen temperature controller receives a first measured temperature sent by the fuel oil temperature sensor, compares the first measured temperature with a set target temperature, and sends a first heating control signal to the platen heater according to a comparison result; and the base temperature controller receives a second measured temperature sent by the fuel injector temperature sensor, compares the second measured temperature with a set target temperature, and sends a second heating control signal to the base heater according to a comparison result.

Optionally, the platen temperature controller receives a first measured temperature sent by the fuel oil temperature sensor, makes a difference between the first measured temperature and a set target temperature, calculates the heating power of the platen heater according to the difference, and sends a first heating control signal to the platen heater; and the base temperature controller receives a second measured temperature sent by the fuel injector temperature sensor, makes a difference between the second measured temperature and a set target temperature, calculates the heating power of the base heater according to the difference value, and sends a second heating control signal to the base heater.

Optionally, when a difference between a first measured temperature of the fuel temperature sensor received by the platen temperature controller and the target temperature is smaller than a set threshold, the platen heater is controlled to perform heat preservation and heating at a preset first power.

Optionally, when a difference between a second measured temperature of the fuel injector temperature sensor received by the pedestal temperature controller and the target temperature is smaller than a set threshold, the pedestal heater is controlled to perform heat preservation and heating at a preset second power.

Optionally, the fuel injector is detachably connected with the fuel injector pressing table, and the fuel injector is detachably connected with the fuel injector base.

Optionally, the platen heater is an electric heating rod.

Optionally, the base heater is an electrical heating rod.

Optionally, the number of the electric heating rods is a plurality of, the electric heating rods are respectively inserted into the grooves in the oil sprayer pressing table, the grooves are located around the oil storage cavity and are evenly arranged, and the electric heating rods are matched with the grooves in size.

Optionally, the number of the electric heating rods is multiple, the electric heating rods are respectively inserted into the slots in the base of the fuel injector, the slots are uniformly arranged around the fuel injector, and the electric heating rods are matched with the slots in size.

Optionally, the fuel injector pressure table is fixedly connected with the fuel injector base in a detachable mode.

The beneficial effects of the embodiment of the specification are as follows:

in the embodiment of the specification, normal-temperature fuel oil flows into an oil storage cavity of an oil injector pressure table through an oil inlet pipeline, a fuel oil temperature sensor measures the temperature of the fuel oil and sends the temperature of the fuel oil to a pressure table temperature controller, the pressure table temperature controller calculates a corresponding heating power signal according to the difference value between the temperature of the fuel oil and a set target temperature and sends the signal to a pressure table heater, and the pressure table heater heats the oil injector pressure table according to the received heating power signal, so that the temperature of the fuel oil in the oil storage cavity in the oil injector pressure table is increased until the temperature of the fuel oil is increased to the target temperature of an injection experiment; meanwhile, the temperature of the oil sprayer is measured by the oil sprayer temperature sensor and sent to the base temperature controller, the base temperature controller calculates a corresponding heating power signal according to the difference value between the temperature of the oil sprayer and the set target temperature and sends the signal to the base heater, and the base heater heats the base of the oil sprayer according to the received heating power signal, so that the temperature of the oil sprayer in the base of the oil sprayer is increased until the temperature of the oil sprayer is increased to the target temperature of the injection experiment. The fuel temperature and the fuel injector temperature reach the target temperature of the fuel injector experiment, so that the temperature of fuel at the target temperature cannot be reduced when the fuel flows through the fuel injector at the same temperature for the injection experiment, the fuel temperature at the injection outlet is accurately controlled, the problem that the fuel injection temperature cannot be accurately controlled in the conventional high-temperature fuel injection experiment is solved, and the fuel injection experiment device is improved in progress.

The innovation points of the embodiment of the specification comprise:

1. in the fuel injection device in the embodiment of the specification, normal-temperature fuel flows into an oil storage cavity of a fuel injector pressure table through an oil inlet pipeline, a fuel temperature sensor measures the temperature of the fuel and sends the temperature of the fuel to a pressure table temperature controller, the pressure table temperature controller calculates a corresponding heating power signal according to the difference value between the temperature of the fuel and a set target temperature and sends the signal to a pressure table heater, and the pressure table heater heats the fuel injector pressure table according to the received heating power signal, so that the temperature of the fuel in the oil storage cavity in the fuel injector pressure table is increased until the temperature of the fuel is increased to the target temperature of an injection experiment; meanwhile, the temperature of the oil sprayer is measured by the oil sprayer temperature sensor and sent to the base temperature controller, the base temperature controller calculates a corresponding heating power signal according to the difference value between the temperature of the oil sprayer and the set target temperature and sends the signal to the base heater, and the base heater heats the base of the oil sprayer according to the received heating power signal, so that the temperature of the oil sprayer in the base of the oil sprayer is increased until the temperature of the oil sprayer is increased to the target temperature of the injection experiment. The fuel temperature and the fuel injector temperature reach the target temperature of the fuel injector experiment, so that the temperature of the fuel flowing through the fuel injector in the fuel injection process is ensured not to be greatly reduced, the problem that the injection temperature of the high-temperature fuel injection experiment cannot be accurately controlled is solved, and the method is one of the innovation points of the embodiment of the specification.

2. The fuel injector pressure table is heated to enable the temperature of the fuel to reach the experimental target temperature, the fuel is in an oil storage cavity in the fuel injector pressure table, and the pressure table heater heats the fuel in the oil storage cavity by heating the fuel injector pressure table. Compared with a mode of directly heating the fuel, the heating mode can stably and uniformly heat the fuel, so that the internal temperature of the fuel is uniformly distributed, the fuel temperature measured by the fuel temperature sensor can represent the actual temperature of the fuel, the accuracy of fuel temperature control is improved, and the method is one of the innovation points of the embodiment of the specification.

3. When the deviation between the fuel temperature received by the platen temperature controller and the target temperature is smaller than a set threshold value, the platen temperature controller sends preset heating power to the platen heater, so that the platen heater performs heating enough to maintain the target temperature of the fuel according to the preset heating power, the temperature of the fuel is kept within a determined range, the heat preservation of the fuel at the target temperature is realized, and the platen temperature controller is one of innovation points of the embodiment of the specification.

4. The base heater heats the base of the oil sprayer to heat the oil sprayer in the base of the oil sprayer. Compared with a mode of directly heating the oil injector, the heating mode can enable the oil injector to be heated more uniformly, so that the temperature distribution on the oil injector is uniform, the temperature of the oil injector measured by the oil injector temperature sensor is more representative, the accuracy of controlling the temperature of the oil injector is improved, the temperature of high-temperature fuel cannot be greatly reduced when the high-temperature fuel flows through the oil injector in an injection experiment, and the accuracy of controlling the temperature of the fuel outlet of the fuel injection experiment is improved, so that the heating mode is one of the innovation points of the embodiment of the specification.

5. When the deviation between the temperature of the fuel injector received by the base temperature controller and the target temperature is smaller than a set threshold, the base temperature controller sends preset heating power to the base heater, so that the base heater heats the fuel injector enough to maintain the target temperature of the fuel injector according to the preset heating power, the temperature of the fuel injector is kept within a determined range, the heat preservation of the fuel injector at the target temperature is realized, and the base temperature controller is one of innovation points of the embodiment of the specification.

Drawings

In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present specification, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a sectional view showing the construction of an apparatus for controlling a fuel injection temperature according to an embodiment of the present disclosure;

in the figure, 1-platen heater; 2-oil inlet pipeline; 3-pressing the oil injector; 4-a platen temperature controller; 5-a fuel temperature sensor; 6-oil injector; 7-base temperature controller; 8-a fuel injector base; 9-a pedestal heater; 10-fuel injector temperature sensor.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments in the present specification without any inventive step are within the scope of the present specification.

The direct injection technology in the cylinder revolutionized the field of engines, and the fuel injector is arranged in the cylinder, so that the fuel injector has many advantages, such as no throttle valve is needed, thereby reducing pumping loss at low load, the mixed gas is formed in the cylinder, so that the temperature and pressure in the cylinder are reduced, thereby improving the charging efficiency, reducing the possibility of engine explosion, and the like. However, since the process of forming the mixed gas in the cylinder is complicated and has many influencing factors, the injection process and the spray formation are experimented to explore the range of relevant parameters beneficial to realizing the combustion economy, and the high-temperature fuel injection temperature has a remarkable influence on the accuracy of the experiment. The conventional fuel injection device cannot accurately control the temperature of fuel reaching the outlet of the fuel injector, and uncertain factors are brought to subsequent conclusions of fuel injector experiments. Therefore, the design of the experimental fuel injection device capable of accurately controlling the fuel injection temperature has important significance.

The embodiment of the specification discloses a device for controlling fuel injection temperature. The details will be described below.

Fig. 1 is a sectional view showing the structure of an apparatus for controlling a fuel injection temperature according to an embodiment of the present disclosure. In the figure, 1-platen heater; 2-oil inlet pipeline; 3-pressing the oil injector; 4-a platen temperature controller; 5-a fuel temperature sensor; 6-oil injector; 7-base temperature controller; 8-a fuel injector base; 9-a pedestal heater; 10-fuel injector temperature sensor.

As shown, an apparatus for controlling a fuel injection temperature includes: advance oil pipe way, sprayer pressure platform, pressure platform heater, fuel temperature sensor, pressure platform temperature controller, sprayer base, sprayer temperature sensor, base heater, base temperature controller, wherein:

the fuel injector pressure table is internally provided with a fuel storage cavity, the tail end of the fuel inlet pipeline is communicated with the fuel storage cavity, the fuel injector pressure table is used for fixing the fuel injector in the base, and the fuel storage cavity provides a storage and heating space before fuel enters the fuel injector, so that the fuel can be heated before entering the fuel injector, and in the fuel injection process, the space provided by the fuel storage cavity has a buffer effect, so that the fuel injection pressure fluctuation can be reduced, and the fuel can be injected in a stable pressure manner.

The fuel injector is fixed in the fuel injector base through the fuel injector pressing table, and a fuel inlet pipe joint of the fuel injector is communicated with the fuel storage cavity. The fuel injector is connected with the fuel storage cavity, and injection experiments are carried out after high-pressure fuel enters the fuel injector to simulate the injection of the fuel in the cylinder.

The pressure table heater is arranged in the fuel injector pressure table, provides thermal power to heat the fuel injector pressure table, transfers heat to a fuel storage cavity in the fuel injector pressure table, and heats fuel to a target temperature required by an injection experiment. Compared with a mode of directly heating the fuel, the heating mode can enable the fuel to be heated stably and uniformly, so that the internal temperature of the fuel is distributed uniformly, the fuel temperature measured by the fuel temperature sensor can represent the actual temperature of the fuel more, and the accuracy of fuel temperature control is improved.

The fuel temperature sensor is arranged in the fuel storage cavity and used for accurately measuring the fuel temperature and sending the obtained current fuel temperature to the platen temperature controller, so that the platen temperature controller can provide corresponding heating control signals for the platen heater according to the current fuel temperature.

The base heater is arranged in the oil sprayer base and heats the oil sprayer base, so that the oil sprayer base is heated, heat is transferred to the oil sprayer, and the temperature of the oil sprayer reaches the target temperature required by an experiment. Compared with a mode of directly heating the oil sprayer, the heating mode can enable the oil sprayer to be heated more uniformly, so that the temperature on the oil sprayer is distributed uniformly, the oil sprayer temperature measured by the oil sprayer temperature sensor is more representative, and the accuracy of controlling the oil sprayer temperature is improved.

The oil sprayer temperature sensor is arranged on the surface of the oil sprayer, accurately measures the temperature of the current oil sprayer, and sends the obtained current oil sprayer temperature to the base temperature controller, so that the base temperature controller can provide corresponding heating control signals for the base heater according to the current oil sprayer temperature.

And the platen temperature controller receives a first measured temperature sent by the fuel oil temperature sensor, compares the first measured temperature with a set target temperature, and sends a first heating control signal to the platen heater according to a comparison result. The platen temperature controller receives the first measured temperature, compares the first measured temperature with a target temperature, calculates a first heating signal according to an algorithm preset in the platen temperature controller, and sends the signal to the platen heater, so that the temperature control of fuel oil which does not enter the fuel injector is realized, and preparation is made for high-temperature fuel oil injection.

And the base temperature controller receives a second measured temperature sent by the fuel injector temperature sensor, compares the second measured temperature with a set target temperature, and sends a second heating control signal to the base heater according to a comparison result. The base temperature controller receives the second measured temperature, compares the second measured temperature with the target temperature, calculates a second heating signal according to a preset algorithm in the base temperature controller, and sends the second heating signal to the base heater, so that the temperature of the fuel injector is controlled, the heat loss of high-temperature fuel oil flowing through the fuel injector is almost zero, and the accurate control of the temperature of the injection outlet is realized.

In a specific embodiment, the platen temperature controller receives a first measured temperature sent by the fuel temperature sensor, makes a difference between the first measured temperature and a set target temperature, calculates the heating power of the platen heater according to the difference, and sends a first heating control signal to the platen heater. The platen temperature controller calculates the heating power of the platen heater according to a preset algorithm according to the difference value between the first measured temperature and the target temperature, thereby realizing the accurate control of the first measured temperature.

And the base temperature controller receives a second measured temperature sent by the fuel injector temperature sensor, makes a difference between the second measured temperature and a set target temperature, calculates the heating power of the base heater according to the difference value, and sends a second heating control signal to the base heater. The base temperature controller calculates the heating power of the base heater according to a preset algorithm according to the difference value between the second measured temperature and the target temperature, so that the second measured temperature is accurately controlled.

In this embodiment, the platen temperature controller and the base temperature controller respectively receive corresponding temperature signals, and calculate corresponding heating control signals according to respective preset algorithms according to respective temperature signals and target temperatures, so as to realize accurate control of temperatures at corresponding measurement positions, which is the core of the whole temperature control device.

In a specific embodiment, when the difference value between the first measured temperature of the fuel temperature sensor received by the platen temperature controller and the target temperature is smaller than a set threshold value, the platen heater is controlled to perform heat preservation and heating at a preset first power. This pressure platform temperature controller is less than under the condition of settlement threshold at the fuel temperature deviation, and control pressure platform heater heats with the first power of predetermineeing for when there is little deviation in the fuel temperature, pressure platform temperature controller has the function that the heat preservation was heated, thereby realizes controlling the fuel temperature more accurately.

In a specific embodiment, when the difference between the second measured temperature of the fuel injector temperature sensor received by the base temperature controller and the target temperature is smaller than a set threshold, the base heater is controlled to perform heat preservation heating at a preset second power. The base temperature controller controls the base heater to heat with preset second power under the condition that the temperature deviation of the oil sprayer is smaller than a set threshold value, so that the base temperature controller has a heat preservation and heating function when the temperature of the oil sprayer is slightly deviated, and the temperature of the oil sprayer is controlled more accurately.

In a specific embodiment, the injector is detachably connected to the injector pressure table, and the injector is detachably connected to the injector base. The connection mode between the oil sprayer and the oil sprayer pressing table and the oil sprayer base is of a detachable structure, so that the oil sprayer can be flexibly replaced when the experiment requirement changes.

In a specific embodiment, the pressing platform heater is an electric heating rod, and electric heating of the oil injector pressing platform is achieved.

In one implementation mode, the number of the electric heating rods is multiple, the electric heating rods are respectively inserted into the grooves in the oil sprayer pressing table, the grooves are located around the oil storage cavity and are evenly arranged, and the electric heating rods are matched with the grooves in size. The slotting of the oil sprayer pressure table is uniformly arranged around the oil storage cavity, and the electric heating rod matched with the slotting heats the oil sprayer pressure table, so that the oil storage cavity is uniformly heated, and the fuel oil is uniformly heated. Compared with a mode of directly heating the fuel, the heating mode enables the temperature distribution in the fuel to be more uniform, and is beneficial to accurate measurement of the fuel temperature, thereby realizing accurate control of the fuel temperature.

In a specific embodiment, the base heater is an electric heating rod, and electric heating of the fuel injector base is achieved.

In one implementation mode, the number of the electric heating rods is multiple, the electric heating rods are respectively inserted into the slots in the oil sprayer base, the slots are uniformly arranged around the oil sprayer, and the electric heating rods are matched with the slots in size. The grooving of sprayer base evenly sets up around the sprayer, and the electric heating rod of adaptation with it heats the sprayer base for the sprayer is heated evenly. Compared with a mode of directly heating the oil sprayer, the heating mode enables the temperature distribution on the oil sprayer to be more uniform, and is beneficial to accurate measurement of the temperature of the oil sprayer, so that the temperature of the oil sprayer can be accurately controlled.

In a specific embodiment, the fuel injector pressure table is fixedly connected with the fuel injector base in a detachable mode, so that the fuel injector pressure table is fixed on the fuel injector base.

In one implementation mode, the oil sprayer pressure table and the oil sprayer base are fixed through screws so as to compress the oil sprayer, reduce the vibration of the oil sprayer in the oil spraying process and improve the stability of the device.

In this embodiment, the purpose of heating the fuel is achieved by heating the fuel injector pressure table, and the purpose of heating the fuel injector is achieved by heating the fuel injector base, so that in the device of this embodiment, the fuel and the fuel injector reach the same experimental target temperature. When fuel flows through the fuel injector in the fuel injection process, the temperature of the fuel is kept unchanged, so that the temperature of the fuel at the outlet of the fuel injector in the injection experiment is accurately controlled, and the accuracy of the fuel injector experiment is ensured.

It should be noted that the terms "including" and "having" and any variations thereof in the embodiments of the present specification and the drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.

Those of ordinary skill in the art will understand that: modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, or may be located in one or more devices different from the embodiments with corresponding changes. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.