阅读说明：本技术 一种改善燃油稀释率的发动机结构、汽车及方法 (Engine structure, automobile and method for improving fuel dilution rate ) 是由 欧阳丹 施发义 万建 查乃敏 丁伟 于 2021-06-30 设计创作，主要内容包括：本发明公开了一种改善燃油稀释率的发动机结构、汽车和方法,涉及汽车发动机技术领域,解决了低温环境下,发动机中机油被燃油稀释的问题。发动机的缸套内壁设有集油槽,集油槽的槽底低于集油槽的槽口,集油槽的槽口低于发动机活塞的下止点；缸套侧壁还设有出气通道和回油通道,集油槽通过出气通道与发动机的曲轴箱通风系统连通,集油槽通过回油通道与发动机的油底壳连通,出气通道的进气口高于回油通道的进油口,有效降低燃油稀释率。本发明还公开了一种改善燃油稀释率的方法,通过收集混合油的方式,给与液态燃油挥发的时间和空间,以此降低燃油稀释率。(The invention discloses an engine structure, an automobile and a method for improving fuel oil dilution rate, relates to the technical field of automobile engines, and solves the problem that engine oil in an engine is diluted by fuel oil in a low-temperature environment. An oil collecting groove is formed in the inner wall of a cylinder sleeve of the engine, the bottom of the oil collecting groove is lower than the notch of the oil collecting groove, and the notch of the oil collecting groove is lower than the lower dead point of a piston of the engine; the side wall of the cylinder sleeve is also provided with an air outlet channel and an oil return channel, the oil collecting tank is communicated with a crankcase ventilation system of the engine through the air outlet channel, the oil collecting tank is communicated with an oil pan of the engine through the oil return channel, and an air inlet of the air outlet channel is higher than an oil inlet of the oil return channel, so that the dilution rate of fuel oil is effectively reduced. The invention also discloses a method for improving the fuel oil dilution rate, which reduces the fuel oil dilution rate by giving time and space for volatilizing the liquid fuel oil in a mode of collecting the mixed oil.)

1. An engine structure for improving the fuel oil dilution rate is characterized in that an oil collecting groove is formed in the inner wall of a cylinder sleeve of the engine, the bottom of the oil collecting groove is lower than the notch of the oil collecting groove, and the notch of the oil collecting groove is lower than the bottom dead center of a piston of the engine;

the oil collecting tank is communicated with a crankcase ventilation system of the engine through the air outlet channel, the oil collecting tank is communicated with an oil pan of the engine through the oil return channel, and an air inlet of the air outlet channel is higher than an oil inlet of the oil return channel.

2. The engine structure for improving the fuel dilution rate according to claim 1, wherein the oil collecting groove includes a ring groove, the ring groove is circumferentially provided along an inner wall of a cylinder liner of the engine, the ring groove is communicated with the air outlet passage, and the ring groove is communicated with the oil return passage.

3. The engine structure for improving fuel dilution ratio according to claim 2, wherein the oil collecting groove further includes an oil collecting channel provided in a cylinder liner side wall of the engine, the oil collecting channel having an inner diameter larger than a groove width of the ring groove;

the annular passes through collect oil passageway with the air outlet channel intercommunication, the annular passes through collect oil passageway with oil return channel intercommunication, air outlet channel's air inlet is located collect the upper portion of oil passageway inner wall, oil return channel's oil inlet is located collect the middle part of oil passageway.

4. The engine structure that improves the fuel dilution ratio according to claim 1, characterized in that the engine further includes a heating mechanism that includes a heater rod, the heater rod being disposed with a gap in the oil collection passage.

5. The engine structure for improving the fuel dilution rate according to claim 4, wherein a fixing member is provided at one end of the heating rod, and the periphery of the fixing member is fixedly connected with the inner wall of the oil collecting channel.

6. The engine structure for improving the fuel dilution rate according to claim 5, wherein the length direction of the oil collecting channel is a straight line, the length direction of the heating rod is a straight line, the fixing member is a plug screw, the plug screw is coaxial with the oil collecting channel, and the inner wall of the oil collecting channel is provided with an internal thread which is in threaded fit with the plug screw.

7. The engine structure for improving the fuel dilution rate according to claim 6, wherein a heating cavity is formed in the heating rod, a heating wire is arranged in the heating cavity, a wire harness connector is arranged on the end face of the screw plug, and the heating wire is connected with a controller through the wire harness connector.

8. An automobile having an improved fuel dilution ratio, characterized in that the automobile includes an engine structure according to any one of claims 1 to 7.

9. A method of improving a fuel dilution ratio, wherein the method of improving a fuel dilution ratio is implemented based on the automobile of claim 8, and the method comprises:

collecting the liquid fuel oil and the liquid engine oil remained on the inner wall of the cylinder sleeve of the automobile engine through the oil collecting groove;

volatilizing the liquid fuel in the oil collecting tank into gaseous fuel;

recovering the gaseous fuel and the liquid engine oil, delivering the gaseous fuel to a crankcase ventilation system of the engine, and delivering the liquid engine oil to an oil pan of the engine.

10. The method of improving fuel dilution according to claim 9, wherein volatilizing the liquid fuel in the sump into a gaseous fuel includes:

judging the environment temperature of the automobile, and naturally volatilizing the liquid fuel into gaseous fuel when the environment temperature is higher than 0 ℃;

and when the ambient temperature is not more than 0 ℃, heating the liquid fuel oil and the liquid engine oil to accelerate the volatilization of the liquid fuel oil.

Technical Field

The invention relates to the technical field of automobile engines, in particular to an engine structure, an automobile and a method for improving fuel dilution rate.

Background

At present, gasoline engines generally adopt an in-cylinder direct injection technology to improve combustion and improve the fuel economy and power response of the engines. The direct injection engine in the cylinder is directly injected into the cylinder through the fuel nozzle, in order to improve the atomization effect of the fuel, higher injection pressure is adopted, the fuel is inevitably injected to the wall surface of the cylinder, and the fuel flows into the crankcase along the wall of the cylinder and is mixed into engine oil. If the engine runs for a long time, fuel mixed in the engine oil is volatilized after the temperature of the engine oil is increased, and enters a combustion chamber through a crankcase ventilation system to be combusted. If the engine runs for a short distance in a low-temperature environment for a long time, the engine oil is at a low temperature, fuel oil in the engine oil cannot be volatilized, and the fuel oil can be seriously diluted along with the increasing amount of the fuel oil, so that the liquid level of the engine oil is increased, the viscosity of the engine oil is reduced, and the friction pair of the engine is damaged.

Disclosure of Invention

The invention aims to provide an engine structure, an automobile and a method for improving fuel dilution rate, and aims to solve the problem of high fuel dilution rate caused by mixing fuel into engine oil in the process of engine operation in the background technology.

In order to achieve the above purpose, the technical scheme of the invention is as follows:

an oil collecting groove is formed in the inner wall of a cylinder sleeve of the engine, the bottom of the oil collecting groove is lower than the notch of the oil collecting groove, and the notch of the oil collecting groove is lower than the bottom dead center of a piston of the engine;

the oil collecting tank is communicated with a crankcase ventilation system of the engine through the air outlet channel, the oil collecting tank is communicated with an oil pan of the engine through the oil return channel, and an air inlet of the air outlet channel is higher than an oil inlet of the oil return channel.

Preferably, the oil collecting tank includes the annular, the annular is followed the cylinder liner inner wall circumference setting of engine, the annular with air outlet channel communicates, the annular with oil return channel communicates.

Preferably, the oil collecting groove further comprises an oil collecting channel, the oil collecting channel is arranged on the side wall of a cylinder sleeve of the engine, and the inner diameter of the oil collecting channel is larger than the groove width of the ring groove;

the annular passes through collect oil passageway with the air outlet channel intercommunication, the annular passes through collect oil passageway with oil return channel intercommunication, air outlet channel's air inlet is located collect the upper portion of oil passageway inner wall, oil return channel's oil inlet is located collect the middle part of oil passageway.

Preferably, the engine further comprises a heating mechanism, wherein the heating mechanism comprises a heating rod, and a gap of the heating rod is arranged in the oil collecting channel.

Preferably, a fixing piece is arranged at one end of the heating rod, and the periphery of the fixing piece is fixedly connected with the inner wall of the oil collecting channel.

Preferably, the length direction of the oil collecting channel is a straight line, the length direction of the heating rod is a straight line, the fixing part is a plug screw, the plug screw is coaxial with the oil collecting channel, and the inner wall of the oil collecting channel is provided with an internal thread matched with the plug screw in a threaded manner.

Preferably, be equipped with the heating chamber in the heating rod, be equipped with the heating wire in the heating chamber, the terminal surface of plug screw is equipped with the pencil and connects, the heating wire passes through pencil articulate has the controller.

An automobile with improved fuel dilution ratio includes the engine structure.

A method of improving fuel dilution ratio, the method being implemented in the vehicle, the method comprising:

collecting the liquid fuel oil and the liquid engine oil remained on the inner wall of the cylinder sleeve of the automobile engine through the oil collecting groove;

volatilizing the liquid fuel in the oil collecting tank into gaseous fuel;

recovering the gaseous fuel and the liquid engine oil, delivering the gaseous fuel to a crankcase ventilation system of the engine, and delivering the liquid engine oil to an oil pan of the engine.

Preferably, the volatilizing the liquid fuel in the oil collecting tank into gaseous fuel specifically includes:

judging the environment temperature of the automobile, and naturally volatilizing the liquid fuel into gaseous fuel when the environment temperature is higher than 0 ℃;

and when the ambient temperature is not more than 0 ℃, heating the liquid fuel oil and the liquid engine oil to accelerate the volatilization of the liquid fuel oil.

The invention has the beneficial effects that:

according to the technical scheme, the engine structure disclosed by the invention collects the mixed oil of the fuel oil and the engine oil through the oil collecting groove arranged on the inner wall of the cylinder sleeve, the mixed oil stands still in the oil collecting groove, and the gaseous fuel oil overflowing from the mixed oil is conveyed to the combustion chamber of the engine by the crankcase ventilation system through the air outlet channel to be combusted, so that the fuel oil mixed in the engine oil can volatilize in space and time, the dilution rate of the fuel oil to the engine oil is reduced, the structure is simple and effective, and the operation of a piston mechanism in the engine can not be influenced;

the invention also discloses an automobile for improving the dilution rate of fuel oil, wherein the engine structure is arranged in the automobile, the dilution rate of the fuel oil in the engine to the engine oil is reduced through the engine structure, the viscosity maintenance time of the engine oil is prolonged, a friction pair of the engine is not easy to damage, the failure rate of the automobile is correspondingly reduced, and the maintenance cost of the automobile is saved;

the invention also discloses a method for improving the fuel oil dilution rate, which accelerates the volatilization speed of the fuel oil by collecting the mixed oil and heating the mixed oil in the low-temperature environment, so as to reduce the fuel oil dilution rate in the low-temperature environment, further avoid the viscosity reduction of the engine oil and slow down the damage of the friction pair of the engine.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of a piston assembly located at a top dead center according to embodiment 1 of the present invention;

FIG. 2 is a schematic structural diagram of the piston assembly at the bottom dead center according to embodiment 1 of the present invention;

FIG. 3 is a schematic structural view of a heating mechanism according to embodiment 1 of the present invention;

fig. 4 is a schematic flow chart of embodiment 2 of the present invention.

The labels in the figure are: 1-cylinder sleeve, 2-piston assembly, 3-oil collecting tank, 4-heating mechanism, 301-ring groove, 302-oil collecting channel, 303-air outlet channel, 304-oil return channel, 401-heating rod, 402-plug screw and 403-wire harness joint.

Detailed Description

The technical solutions in the embodiments will be described clearly and completely below with reference to the attached drawings in the embodiments, which should not be construed as limiting the invention to the specific embodiments, but merely as an explanation and understanding:

example 1

As shown in fig. 1, fig. 2 and fig. 3, the present embodiment provides an engine structure for improving a fuel dilution rate, where the engine includes a cylinder block and a piston assembly 2, the cylinder block is provided with a cylinder liner 1, the piston assembly 2 reciprocates along an axial direction of the cylinder liner 1, a highest point of the piston assembly 2 moving in the cylinder liner 1 is a top dead center, and a lowest point of the piston assembly 2 moving in the cylinder liner 1 is a bottom dead center. During the downward movement of the piston assembly 2, the fuel injected by the fuel nozzle on the inner wall of the cylinder sleeve 1 is pushed by the piston assembly 2 to flow downwards.

Therefore, in the embodiment, referring to fig. 1 and 2, the oil collecting groove 3 is formed in the inner wall of the cylinder sleeve 1 of the engine, and the notch of the oil collecting groove 3 is lower than the bottom dead center of the piston assembly 2 of the engine, so that oil scraped from the inner wall of the cylinder sleeve 1 by the piston assembly 2 can enter the oil collecting groove 3 from the notch of the oil collecting groove 3 along the inner wall of the cylinder sleeve 1, and the notch of the oil collecting groove 3 is located below the bottom dead center of the piston assembly 2, so that the operation of the piston assembly 2 is not affected; the bottom of the oil sump 3 is lower than the opening of the oil sump 3 so that the mixed oil of fuel oil and engine oil can be collected in the oil sump 3.

The side wall of the cylinder sleeve 1 is also provided with an air outlet channel 303 and an oil return channel 304, the oil collecting tank 3 is communicated with a crankcase ventilation system of the engine through the air outlet channel 303, and fuel steam volatilized in the oil collecting channel is extracted by negative pressure of the crankcase ventilation system and is finally conveyed to a combustion chamber of the engine by the crankcase ventilation system to be combusted.

The oil sump 3 communicates with the oil pan of the engine through an oil return passage 304, and oil collected from the oil return passage 304 flows back to the oil pan. The air inlet of the air outlet channel 303 is higher than the oil inlet of the oil return channel 304, so that the functions of the air outlet channel 303 and the oil return channel 304 can be normally used, and the negative pressure generated by the crankcase ventilation system is not enough to pump the liquid oil in the oil collection channel 302 into the crankcase ventilation system.

In this embodiment, the specific structure of the engine is as follows:

referring to fig. 1, the oil collecting tank 3 includes a ring groove 301, the ring groove 301 is disposed along the circumferential direction of the inner wall of the cylinder liner 1 of the engine, that is, the ring surface where the notch of the ring groove 301 is located is coaxial with the cylinder liner 1, so that the notch of the ring groove 301 can collect the liquid oil in all directions of the inner wall of the cylinder liner 1, and the ring groove 301 is disposed obliquely, so that the notch of the ring groove 301 is higher than the bottom of the ring groove 301.

The oil collecting tank 3 further comprises an oil collecting channel 302, the oil collecting channel 302 is arranged on the side wall of the cylinder sleeve 1 of the engine, the oil collecting channel 302 is communicated with the ring groove 301, liquid oil on the inner wall of the cylinder sleeve 1 enters the oil collecting channel 302 from the ring groove 301, and the ring groove 301 is respectively communicated with the air outlet channel 303 and the oil return channel 304 through the oil collecting channel 302.

The oil collecting passage 302 has an inner diameter larger than the groove width of the ring groove 301 to increase the amount of the oil collecting groove 3 capable of storing liquid fuel while increasing the storage space of vapor fuel. The air inlet of the air outlet channel 303 is positioned at the upper part of the inner wall of the oil collecting channel 302, and the oil inlet of the oil return channel 304 is positioned at the middle part of the oil collecting channel 302, so that liquid oil can be stored in the oil collecting channel 302 for a certain time, fuel oil in the liquid oil volatilizes, and the content of the fuel oil in the liquid oil is reduced.

In this embodiment, the length direction of the oil collecting channel 302 is a straight line, so as to further facilitate the processing.

Referring to fig. 3, the engine further includes a heating mechanism 4, and the heating mechanism 4 includes heating rods 401, and the heating rods 401 are disposed in the oil collecting passage 302 with a gap therebetween. The heating rod 401 is used for increasing the temperature in the oil collecting channel 302 to accelerate the volatilization of the fuel oil in the oil liquid. In the experiment, when the gasoline in the mixed oil is heated to 140 ℃, 90% of the gasoline is volatilized into a gas state and is pumped into a combustion chamber through a crankcase ventilation system to be combusted, and the oil is still kept in a liquid state at 140 ℃. In this embodiment, heating rod 401 adopts the mode heating of electric heat, is equipped with the heating chamber in the heating rod 401, is equipped with the heating wire in the heating chamber, and the heating wire during operation can make heating rod 401 heat up fast through the heat transfer, and fuel in the heating rod 401 heating oil gathering passageway 302 makes the fuel volatilize fast. In the embodiment, only the mixed oil in the oil collecting channel 302 is heated, so that the accuracy and the energy consumption are low, and the volatilized fuel oil can be quickly discharged out of the oil collecting channel 302 through the air outlet channel 303 under the negative pressure of the crankcase ventilation system. The electric heating wire penetrates out of the heating rod 401 to be connected with a controller, and whether the electric heating wire works and the power of the electric heating wire during working are controlled through the controller.

When the engine is started, if the ambient temperature is higher than 0 ℃, the fuel oil dilution condition is not obvious, and the electric heating wire can be closed by the controller, so that the electric energy is saved. When the ambient temperature is less than or equal to 0 ℃, the risk that the fuel oil dilution exceeds the standard exists, and the controller can start the electric heating wire to electrify and heat the electric heating wire so as to ensure that the fuel oil dilution rate is in a qualified range.

The one end fixed mounting of heating rod 401 has the mounting, and the mounting cup joints on heating rod 401, the periphery and the oil collecting channel 302 inner wall fixed connection of mounting. So that the heating rod 401 can be stably arranged in the oil collecting channel 302, and the heating rod 401 can keep clearance fit with the oil collecting channel 302, so that the oil in the oil collecting channel 302 is heated more uniformly.

The fixing piece can be a fixing block with a shape matched with the cross section of the oil collecting channel 302, the fixing block can be in interference fit with the oil collecting channel 302 to complete installation of the heating rod 401, referring to fig. 3, the length direction of the oil collecting channel 302 in the embodiment is a straight line, the length direction of the heating rod 401 is also a straight line, the fixing piece can use a plug screw 402, the plug screw 402 is coaxial with the oil collecting channel 302, the inner wall of the oil collecting channel 302 is provided with an internal thread matched with the external thread of the plug screw 402, the heating rod 401 is screwed in the oil collecting channel 302 through the plug screw 402, the end face of the plug screw 402, which faces away from the heating rod 401, is provided with a wire harness connector 403, and the electric heating wire is connected with the controller through the wire harness connector 403.

The oil collecting channel 302 is cylindrical, the heating rod 401 is cylindrical, and the heating rod 401 is coaxial with the oil collecting channel 302, so that the distance between the inner wall of the oil collecting channel 302 and the heating rod 401 is kept consistent, and the efficiency of the heating rod 401 for heating oil in each position of the oil collecting channel 302 tends to be consistent.

Example 2

The embodiment provides an automobile capable of improving the fuel dilution rate, and the engine structure provided by the embodiment 1 is arranged in the automobile. Through setting up the engine structure that embodiment 1 provided, reduced the dilution rate of fuel to engine oil in the engine, increased the viscosity holding time of engine oil, make the vice not fragile of friction of engine, corresponding reduction the fault rate of car, practice thrift vehicle cost of maintenance.

Example 3

Referring to fig. 4, the present embodiment provides a method for improving a fuel dilution ratio, which is implemented based on the vehicle provided in embodiment 2, and includes the following steps:

step 1: collecting the residual liquid fuel oil and liquid engine oil on the inner wall of the cylinder sleeve 1 of the automobile engine through an oil collecting groove 3;

step 2: volatilizing the liquid fuel in the oil collecting tank 3 into gaseous fuel;

and step 3: the method includes recovering the gaseous fuel and the liquid engine oil, delivering the gaseous fuel to a crankcase ventilation system of the engine, and delivering the liquid engine oil to an oil pan of the engine.

Specifically, in step 2, liquid fuel all can volatilize into gaseous fuel naturally under the normal atmospheric temperature condition, and when ambient temperature was greater than 0 degree centigrade, the fuel dilution condition was unobvious, need not to heat the miscella to reduce the power consumption, but the speed of volatilizing under 0 degree centigrade slows down, from this, makes the liquid fuel of oil trap volatilize into gaseous fuel, specifically includes:

judging the environment temperature of the automobile, and naturally volatilizing the liquid fuel into gaseous fuel when the environment temperature is higher than 0 ℃; and when the ambient temperature is not more than 0 ℃, heating the liquid fuel oil and the liquid engine oil to accelerate the volatilization of the liquid fuel oil.

Specifically, when the ambient temperature of the automobile is less than or equal to 0 ℃, the liquid fuel oil and the liquid engine oil are heated to 140 ℃ in the oil collecting tank 3. By utilizing different volatilization characteristics between the fuel oil and the engine oil, the fuel oil in the mixed oil volatilizes and the engine oil keeps liquid at 140 ℃, so that the fuel oil and the engine oil are separated, and the fuel oil dilution rate in a low-temperature environment can be greatly reduced.

And 3, delivering the separated fuel oil into a combustion chamber for combustion through a crankcase ventilation system, and reasonably discharging and utilizing the fuel oil.

It is to be understood that the above examples are merely illustrative for clarity of description and are not limiting on the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.