CN112196706A

CN112196706A - Engine air intake system and engine system

Info

Publication number: CN112196706A
Application number: CN201910609430.6A
Authority: CN
Inventors: 王立新; 尹建民; 吴楚; 郑巍; 张秀英; 顾洁; 郎伟钦; 黄健; 邱劲草; 开进彬; 郑有能; 陈凯; 刘杰; 朱玉萍; 刘兵; 陶火烽; 王唯栋; 张锐; 凌鑫晨; 吴小飞
Original assignee: SAIC General Motors Corp Ltd; Pan Asia Technical Automotive Center Co Ltd
Current assignee: SAIC General Motors Corp Ltd; Pan Asia Technical Automotive Center Co Ltd
Priority date: 2019-07-08
Filing date: 2019-07-08
Publication date: 2021-01-08

Abstract

The present application relates to an engine air intake system, comprising: an intake duct configured in such a shape that an intake port rear surface of the combustion chamber and an exhaust side wall surface of the combustion chamber are tangent; and an intake profile configured to reduce a lift of the cam by 20% to 30% as compared with a lift of a conventional cam, and to reduce a wrap angle of the cam by 20% to 30% as compared with a wrap angle of a conventional cam. Furthermore, the present application relates to an engine system comprising an engine air intake system as described above.

Description

Engine air intake system and engine system

Technical Field

The present application relates to the field of engines for vehicles, and more particularly, to an engine air intake system and an engine system including the same.

Background

With the continuous maturity of the technology of fuel automobiles, the national emission requirements on fuel automobiles are more and more strict. It follows that in order to meet increasingly stringent fuel vehicle emissions requirements, there is a continuing need to increase the operating efficiency of engines.

At present, a small-displacement and high-supercharging engine becomes a main development direction of a fuel vehicle engine. However, engine knock is a major challenge in the development of highly supercharged small displacement engines.

Disclosure of Invention

In view of the above, it is an object of the present invention to provide an engine system that can avoid engine knock while reducing fuel consumption.

According to an aspect of the present application, there is provided an engine intake system including: an intake duct configured in such a shape that an intake port rear surface of the combustion chamber and an exhaust side wall surface of the combustion chamber are tangent; and an intake profile configured to reduce a lift of the cam by 20% to 30% as compared with a lift of a conventional cam, and to reduce a wrap angle of the cam by 20% to 30% as compared with a wrap angle of a conventional cam.

The engine intake system according to some embodiments of the present application may include a guide member integrally configured with the intake port and disposed at a side of an outlet of the intake port close to a combustion chamber wall, for guiding air flowing from the intake port into the combustion chamber to an exhaust side along the combustion chamber wall surface.

An engine air intake system as described in some embodiments herein, wherein the baffle is configured to be positioned in the engine compartment.

The engine intake system according to some embodiments of the present application, wherein the baffle is shaped as a mask.

According to another aspect of the present application, there is provided an engine system comprising an engine air intake system as described in any of the above embodiments.

An engine system as described in some embodiments herein, wherein the engine system further comprises a diamond shaped fuel injector disposed in the cylinder.

The engine system according to some embodiments of the present application, wherein the diamond shaped fuel injector includes six fuel injection holes.

An engine system as described in some embodiments herein, wherein the diamond injector is disposed below the intake passage on a side proximate to the intake passage relative to the cylinder.

According to yet another aspect of the present application, a vehicle is provided that includes an engine air intake system according to any of the embodiments disclosed herein.

According to yet another aspect of the present application, a vehicle is provided that includes an engine system according to any of the embodiments disclosed herein.

Drawings

The above and other objects and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like or similar elements are designated by like reference numerals.

FIG. 1 schematically illustrates an engine air intake system and an engine system as disclosed herein;

FIG. 2 schematically illustrates a spray opening distribution of a diamond fuel injector as disclosed herein; and

fig. 3 illustrates exemplary lift and wrap angle comparisons of intake profiles as disclosed herein with conventional intake profiles.

Detailed Description

For the purposes of brevity and explanation, the principles of the present application are described herein with reference primarily to exemplary embodiments thereof. However, those skilled in the art will readily recognize that the same principles are equally applicable to all types of engine intake systems, and that these same or similar principles may be implemented therein, with any such variations not departing from the true spirit and scope of the present patent application. Moreover, in the following description, reference is made to the accompanying drawings that show specific exemplary embodiments. Changes may be made in these embodiments without departing from the spirit and scope of the application. In addition, while a feature of the present application may have been disclosed with respect to only one of several implementations/embodiments, such feature may be combined with one or more other features of the other implementations/embodiments as may be desired and/or advantageous for any given or identified function. The following description is, therefore, not to be taken in a limiting sense, and the scope of the present application is defined by the appended claims and their equivalents.

FIG. 1 schematically illustrates an engine air intake system 10 according to the present disclosure. The engine intake system disclosed herein is suitable for use in a combustion chamber of a structure that follows the miller cycle. As can be seen in FIG. 1, the engine air induction system 10 disclosed herein includes an air intake duct 1 and a new and improved air intake profile 2 (not fully shown). Specifically, the intake duct 1 according to the present application is configured in such a shape that the intake port rear surface and the combustion chamber exhaust side wall surface of the combustion chamber are tangent to each other. The shape of the air inlet channel 1 can enable the direction of the airflow formed after the inlet valve of the cylinder is opened to be tangent to the top wall surface of the combustion chamber, thereby playing a role of strengthening and guiding the airflow movement and reducing the airflow loss.

Preferably, the intake duct includes a guide member (not shown in the drawings) provided at a side of an outlet of the intake duct close to the combustion chamber wall to guide the air discharged from the intake duct to flow along the combustion chamber wall surface toward the exhaust side. Optionally, the flow guide is configured as a baffle. The baffle of the air inlet channel can be used for blocking the air flow movement, so that the air flow is guided to flow to the exhaust side along the wall surface of the combustion chamber in order, and then high-intensity tumble air flow is formed in the early stage of the air inlet stroke. Optionally, the shape of the baffle is designed to be a mask shape.

Further, according to the engine intake system 10 disclosed in the present application, the intake profile 2 is configured such that the lift of the cam is reduced by 20% to 30% as compared with the lift of the conventional cam, and the wrap angle of the cam is reduced by 20% to 30% as compared with the wrap angle of the conventional cam (see fig. 3). By adopting the small-wrap-angle small-lift-range air inlet molded line, on one hand, the deep Miller can be formed, and the geometric compression ratio is greatly improved, so that the expansion stroke work-applying capacity is fully utilized; on the other hand, the pumping loss can be reduced.

Further, the present application discloses an engine system 100 comprising the engine air intake system 10 described in any of the above embodiments. Preferably, the engine system 100 disclosed herein further includes a diamond injector 3 disposed within the cylinder. Preferably, the rhombic injector 3 comprises six injection holes 31 (shown in fig. 2). Preferably, as shown in fig. 1, the diamond injector 3 is arranged below the intake passage 1 on the side close to the intake passage 1 with respect to the cylinder. The six-hole oil beam sprayed by the side-arranged diamond-shaped oil sprayer is in a diamond shape, and under the guidance of the air inlet channel 1 related to the application, such as the ridge-type combustion chamber 4 and the shallow pit type piston 5, a proper air-fuel mixture space distribution state can be formed in the combustion chamber timely, so that the formation of an initial fire core of the middle-arranged spark plug 6 is facilitated.

Illustratively, the operation of the engine system disclosed herein is: fresh air may enter the intake manifold, for example, through a supercharger, flow through the intake port 1 of the present application, while opening the intake valve using the low lift, low packet angle intake profile disclosed herein to direct fresh air into the cylinder or combustion chamber. Then, the shallow pit piston 5 is compressed to move upwards, and strong air flow movement is maintained. During the period, the side-mounted direct-injection six-hole rhombus injector disclosed by the application injects a proper amount of fuel for 3 times, and a proper spatial distribution state is formed in the combustion chamber. Then, illustratively, the middle-mounted spark plug 7 is used for ignition, so that ignition and combustion of the mixture are realized, and the shallow pit type piston 5 is pushed to do work downwards.

The above examples mainly illustrate the engine intake system and the engine system of the present application. Although only a few embodiments of the present application have been described, those skilled in the art will appreciate that the present application may be embodied in many other forms without departing from the spirit or scope thereof. Accordingly, the present examples and embodiments are to be considered as illustrative and not restrictive, and various modifications and substitutions may be made therein without departing from the spirit and scope of the present application as defined in the appended claims.

Claims

1. An engine air intake system comprising:

an intake duct configured in such a shape that an intake port rear surface of the combustion chamber and an exhaust side wall surface of the combustion chamber are tangent; and

and an intake profile configured such that a lift of the cam is reduced by 20% to 30% compared to that of a conventional cam, and a wrap angle of the cam is reduced by 20% to 30% compared to that of the conventional cam.

2. The engine air intake system of claim 1, wherein the air intake passage includes a flow guide member integrally constructed with the air intake passage and disposed at a side of an outlet of the air intake passage adjacent to the combustion chamber wall for guiding air flowing from the air intake passage into the combustion chamber to flow along the combustion chamber wall toward the exhaust side.

3. The engine air intake system of claim 2, wherein the baffle is configured as a baffle.

4. The engine air intake system of claim 3, wherein the baffle is shaped as a mask.

5. An engine system comprising an engine air intake system according to any one of claims 1 to 4.

6. The engine system of claim 5, further comprising a diamond shaped fuel injector disposed in the cylinder.

7. The engine system of claim 6, wherein said diamond injector comprises six injector holes.

8. The engine system of claim 6, wherein the diamond shaped injector is disposed below the intake port on a side of the cylinder adjacent the intake port.

9. A vehicle comprising an engine air intake system according to any one of claims 1 to 4.

10. A vehicle comprising an engine system according to any one of claims 5 to 8.