CN218717189U

CN218717189U - Low-oil-consumption hybrid special engine applying Miller cycle

Info

Publication number: CN218717189U
Application number: CN202222672343.5U
Authority: CN
Inventors: 王泰晟; 莫煜; 蓝志宝
Original assignee: SAIC GM Wuling Automobile Co Ltd
Current assignee: SAIC GM Wuling Automobile Co Ltd
Priority date: 2022-10-11
Filing date: 2022-10-11
Publication date: 2023-03-24
Anticipated expiration: 2032-10-11

Abstract

The utility model discloses a low-oil consumption hybrid special engine applying Miller cycle, which comprises a cylinder cover and an air inlet channel arranged on the cylinder cover, wherein the end part of the air inlet channel is provided with an air inlet communicated with a combustion chamber, the air inlet is provided with an inlet valve, and the lower side wall of the air inlet channel, which is close to the air inlet end, is provided with an arc surface; and the low-pressure cooled EGR comprises an EGR control valve and a cooler, and the catalyzed exhaust gas is cooled by the cooler and then flows into the air inlet channel by mixing with fresh air through the EGR control valve. The arrangement of the air inlet channel and the high-tumble baffle increase the flowing gas on the upper side of the air valve, so that the tumble ratio is improved, the flow of the gas in the combustion chamber is promoted, and the combustion rate is improved; low-temperature exhaust gas is introduced through low-pressure cooling EGR to reduce the combustion temperature, suppress knocking, increase the ignition advance angle and further improve the heat efficiency of the engine.

Description

Low-oil-consumption hybrid special engine applying Miller cycle

Technical Field

The utility model relates to the technical field of engines, especially a use miller endless low oil consumption thoughtlessly to move special engine.

Background

According to the requirement of a new vehicle of a passenger vehicle of energy-saving and new energy automobile technical route 2.0, the oil consumption of the new vehicle reaches 3.2L/100km in 2030 years, the oil consumption of the A-grade PHEV passenger vehicle in an electric quantity maintaining mode does not exceed 4L/100km, and the hybrid power accounts for more than 75 percent of the oil consumption of the new vehicle of the traditional passenger vehicle. In order to meet the increasingly strict fuel consumption regulations, it has become common industry to develop a hybrid engine for exclusive use, and therefore, it is necessary to develop a hybrid engine for exclusive use with low fuel consumption.

The hybrid vehicle is driven by the motor, so that the power torque demand of the engine is not high, the operating point needs to be located in a region with low fuel consumption rate as much as possible, and the oil consumption of the whole vehicle is reduced. However, the traditional engine is heavier in dynamic property, high in power torque, high in fuel consumption rate, only 36% in thermal efficiency and small in fuel economy area. The reasons for high fuel consumption are mainly as follows:

1. the combustion efficiency is low, the traditional engine adopts a larger flow coefficient at present, and the tumble flow ratio is lower; the smaller compression ratio is adopted to reduce the knocking tendency, which is beneficial to improving the dynamic property, but the fuel consumption rate is increased.

2. The pump gas loss is large, the conventional engine at present adopts an Otto cycle, the expansion ratio is equal to the compression ratio, the pump gas loss is large, the knocking tendency is high, and the fuel consumption rate is increased;

3. friction loss is big, and traditional engine water pump, generator at present, the compressor adopts belt drive, and belt drive leads to friction loss great, also can lead to the fuel consumption rate increase.

SUMMERY OF THE UTILITY MODEL

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract of the specification and the title of the application to avoid obscuring the purpose of this section, the abstract of the specification and the title of the application, and such simplifications or omissions are not intended to limit the scope of the invention.

In order to solve the technical problem, the utility model provides a following technical scheme: a low-oil-consumption hybrid special engine applying Miller cycle comprises a cylinder cover and an air inlet channel arranged on the cylinder cover, wherein the end part of the air inlet channel is provided with an air inlet communicated with a combustion chamber, the air inlet is provided with an air inlet valve, and the lower side wall of the air inlet channel, which is close to the air inlet end, is provided with an arc-shaped surface; and the low-pressure cooled EGR comprises an EGR control valve and a cooler, and the catalyzed exhaust gas is cooled by the cooler and then flows into the air inlet channel by mixing with fresh air through the EGR control valve.

As an application miller cycle's low oil consumption thoughtlessly moves a preferred scheme of special engine, wherein: the distance between the arc-shaped surface of the lower side wall and the axis of the air inlet channel is gradually increased and then gradually decreased.

As an application miller cycle's low oil consumption thoughtlessly moves a preferred scheme of special engine, wherein: and a high tumble baffle is arranged below the air inlet, and the length direction of the high tumble baffle is parallel to the axis of the air inlet valve.

As an application miller cycle's low oil consumption thoughtlessly moves a preferred scheme of special engine, wherein: the cylinder adopts a long-stroke and small-bore design.

As an application miller cycle's low oil consumption thoughtlessly moves a preferred scheme of special engine, wherein: the stroke to cylinder diameter ratio was 1.28.

As an application miller cycle's low oil consumption thoughtlessly moves a preferred scheme of special engine, wherein: the air inlet valve is driven by a small-lift small-wrap-angle air inlet molded line.

As an application miller cycle's low oil consumption thoughtlessly moves a preferred scheme of special engine, wherein: the engine employs a miller cycle with a compression ratio between 13-15.

As an application miller cycle's low oil consumption thoughtlessly moves a preferred scheme of special engine, wherein: the engine also comprises an electronic water pump which is arranged on the cylinder body at the air inlet side of the engine and is communicated with the engine water jacket through an external pipeline.

As an application miller cycle's low oil consumption thoughtlessly moves a preferred scheme of special engine, wherein: the engine is an in-line four-cylinder four-stroke engine.

As an application miller cycle's low oil consumption thoughtlessly moves a preferred scheme of special engine, wherein: the lift range of the intake valve is 3-7 mm.

The utility model discloses beneficial effect does: the arrangement of the air inlet channel and the high-tumble baffle increase the flowing gas on the upper side of the air valve, so that the tumble ratio is improved, the flow of the gas in the combustion chamber is promoted, and the combustion rate is improved; low-temperature exhaust gas is introduced through low-pressure cooling EGR to reduce the combustion temperature, suppress knocking, increase the ignition advance angle and further improve the heat efficiency of the engine.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor. Wherein:

fig. 1 is the internal structure schematic diagram of the cylinder cover of the utility model.

Fig. 2 is the structural schematic diagram of the low-pressure cooling EGR of the present invention.

Fig. 3 is a schematic view of the miller cycle of the present invention.

Fig. 4 is a schematic view of the gas flow of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying the present invention are described in detail below with reference to the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Furthermore, the references herein to "one embodiment" or "an embodiment" refer to a particular feature, structure, or characteristic that may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Example 1

Referring to fig. 1 to 4, for the first embodiment of the present invention, this embodiment provides a low oil consumption hybrid special engine using miller cycle, including a cylinder body and a cylinder cover 100, an air inlet 101 disposed on the cylinder cover 100, an end of the air inlet 101 is provided with an air inlet 102 communicated with a combustion chamber, the air inlet 102 is provided with an air inlet valve 103, the side wall of the air inlet 101 near the end of the air inlet 102 has an arc-shaped surface 104, the air inlet 101 is connected with an air inlet manifold, fresh air enters the air inlet 101 through the air inlet manifold, and then enters the air inlet through the air inlet 102, and the air inlet valve 103 is used for opening and closing the air inlet 102; a low-pressure cooling EGR200 comprises an EGR control valve 201 and a cooler 202, catalyzed exhaust gas is cooled by the cooler 202 and then flows into an air inlet channel 101 through the EGR control valve 201 in a mixed mode with fresh air, an exhaust gas intake port of the low-pressure cooling EGR200 is located at the rear end position of an engine catalyst, the EGR control valve 201 is installed on a cylinder body and a cylinder cover 100, high-temperature exhaust gas generated by the operation of an engine is cooled by the cooler 202, the inflow amount of the exhaust gas into an air inlet manifold is controlled through the EGR control valve 201, and the exhaust gas is mixed with the fresh air and then enters a combustion chamber through the air inlet channel 101.

Further, the lower side wall of the inlet 101 near the inlet 102 has an arc surface 104, and the distance between the arc surface 104 of the lower side wall and the axis of the inlet 101 gradually increases and then gradually decreases. When air flows into the air inlet 102 end through the air inlet manifold 101, the air uniformly flows along the axis of the air inlet 101, the air firstly reaches the gradual increasing section of the lower side wall arc-shaped surface 104, at the moment, the air flow positioned at the lower half part of the axis of the air inlet 101 gradually flows towards the direction far away from the axis of the air inlet 101, the flow speed is gradually reduced, then the gradual reduction of the side wall arc-shaped surface 104 is reached, the air flow positioned at the lower half part of the axis of the air inlet 101 gradually flows towards the direction close to the axis of the air inlet 101, the flow speed is gradually increased, the air flow movement is organized in a reinforcing mode, the tumble strength in the air inlet 101 and the combustion chamber is improved, meanwhile, the air flow at the lower half part of the axis of the air inlet 101 can be guided to flow upwards, the flowing gas on the upper side of the air inlet valve 103 is increased, the tumble ratio is further improved, the air-gas mixture in the combustion chamber is more uniform, and the combustion effect is enhanced.

Further, a high tumble flow baffle 105 is provided below the intake port 102, and the length direction of the high tumble flow baffle 105 is parallel to the axis of the intake valve 103. The arrangement of the high tumble baffle 105 is to reduce the effective circulation area on the lower side of the intake valve 103, block airflow from entering the combustion chamber from the lower side of the intake valve 103, guide airflow from the upper side of the intake valve 103 to enter the combustion chamber, further improve the tumble ratio and improve the combustion efficiency. The length direction of the high tumble flow baffle 105 is parallel to the axis of the intake valve 103, and along with the reduction of the lift of the intake valve 103, the lower edge of the intake valve 103 is in contact with the high tumble flow baffle 105 or keeps a small gap, the airflow at the lower side of the intake valve 103 is blocked, and the airflow can only enter a combustion chamber from the upper side of the intake valve 103.

Fresh air and waste gas cooled by low pressure EGR200 are mixed and then enter an air inlet manifold, then flow through an air inlet channel 101, form high tumble flow under the combined action of a lower side wall arc-shaped surface 104 and a high tumble baffle 105 by opening an air inlet valve 103, and are filled in a combustion chamber to maintain strong air flow movement, a fuel injector injects proper amount of fuel oil to form reasonable oil gas distribution in the combustion chamber, ignition and combustion of mixed gas are realized by igniting through a middle-arranged spark plug, and a piston is pushed to do work.

The low-pressure cooling EGR200 recovers high-temperature waste gas discharged by combustion in the combustion chamber, cools the high-temperature waste gas, mixes fresh air and injects the fresh air into the combustion chamber, and low-temperature waste gas introduced by the low-pressure cooling EGR200 can reduce the combustion temperature, inhibit knocking, increase the ignition advance angle and further improve the heat efficiency of the engine.

Example 2

Referring to fig. 1 to 4, a second embodiment of the present invention, which is different from the first embodiment, is: the combustion chamber is designed with long stroke and small cylinder diameter. The stroke to cylinder diameter ratio was 1.28. Due to the lengthening of the stroke, the flow velocity of gas entering the cylinder is accelerated at a higher piston running speed, so that the turbulence in the combustion chamber is increased, the tumble ratio is improved, and then the rapid combustion is realized and the detonation is inhibited.

Further, the intake valve 103 is driven to open and close by a small-lift small-wrap-angle air intake molded line, and the intake valve 103 driven by the small-wrap-angle air intake molded line can effectively form deep Miller and fully utilize the expansion stroke acting capacity.

Furthermore, the engine adopts the Miller cycle, the compression ratio is between 13 and 15, when the piston does not run to the bottom dead center, the intake valve is closed in advance, the actual compression ratio is reduced, so that the expansion ratio is larger than the compression ratio, and the pumping loss is reduced; meanwhile, the Miller cycle engine has higher geometric compression ratio due to the fact that the air input of the air cylinder is reduced, the temperature of the compression is reduced, the knocking tendency of the engine is reduced, and the thermal efficiency of the Miller cycle engine is further improved.

Furthermore, the engine also comprises an electronic water pump which is arranged on the cylinder body at the air inlet side of the engine and is communicated with the engine water jacket through an external pipeline, so that the flow of cooling water is adjusted according to the working condition of the engine, the temperature rise of the metal wall surface is controlled, and the heat exchange loss is reduced. Meanwhile, in order to reduce the friction loss of the engine, a full-variable displacement oil pump, a roller rocker arm, a piston cooling nozzle control electromagnetic valve, a low-friction coating piston ring and a camshaft bearing are applied, so that the friction loss of the engine is effectively reduced.

Furthermore, the engine is an in-line four-cylinder four-stroke engine, and the thermal efficiency is as high as 42.5%.

It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims

1. A low-oil consumption hybrid special engine applying Miller cycle is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

the combustion chamber comprises a cylinder cover (100), an air inlet (101) arranged on the cylinder cover (100), wherein an air inlet (102) communicated with a combustion chamber is arranged at the end part of the air inlet (101), an air inlet valve (103) is arranged at the air inlet (102), and an arc-shaped surface (104) is arranged on the lower side wall of the end, close to the air inlet (102), of the air inlet (101);

the low-pressure cooling EGR (200) comprises an EGR control valve (201) and a cooler (202), and the catalyzed exhaust gas is cooled by the cooler (202) and then flows into the air inlet channel (101) through the EGR control valve (201) in a mixed mode with fresh air.

2. The low-oil consumption hybrid special engine using the miller cycle as set forth in claim 1, wherein: the distance between the arc-shaped surface (104) of the lower side wall and the axis of the air inlet (101) is gradually increased at first and then gradually decreased.

3. The low-oil consumption hybrid special engine using the miller cycle as set forth in claim 2, wherein: and a high tumble baffle (105) is arranged below the air inlet (102), and the length direction of the high tumble baffle (105) is parallel to the axis of the air inlet valve (103).

4. The special low-oil-consumption hybrid engine using the miller cycle as set forth in any one of claims 1 to 3, wherein: the engine cylinder is designed with long stroke and small cylinder diameter.

5. The low-oil consumption hybrid special engine using the miller cycle as set forth in claim 4, wherein: the stroke to cylinder diameter ratio was 1.28.

6. The low-oil consumption hybrid special engine using the miller cycle as set forth in claim 5, wherein: the intake valve (103) is driven by a small-lift small-wrap-angle intake profile.

7. The low-oil consumption hybrid special engine using the miller cycle as claimed in claim 6, wherein: the engine employs a miller cycle with a compression ratio between 13-15.

8. The low-oil consumption hybrid special engine using the miller cycle as claimed in claim 7, wherein: the engine also comprises an electronic water pump which is arranged on the cylinder body on the air inlet side of the engine and is communicated with the water jacket of the engine through an external pipeline.

9. The special engine for low oil consumption hybrid operation using miller cycle as set forth in any one of claims 1-3 and 5-8, wherein: the engine is an in-line four-cylinder four-stroke engine.

10. The low-oil consumption hybrid special engine using the miller cycle as set forth in claim 9, wherein: the lift of the intake valve (103) is 3-7 mm.