A double-stabilized chamber air intake system for a supercharged gasoline engine

Abstract

The invention discloses an air intake system of a supercharged gasoline engine with double pressure-stabilizing cavities, aiming to solve the problem of imbalance of intake pressure of the supercharged gasoline engines. The air intake system comprises an air cleaner, a supercharger, an intercooler, a restrictor and a group of air intake branches matched with cylinders of the gasoline engine in number, and is characterized in that a first pressure-stabilizing cavity and a second pressure-stabilizing cavity are arranged between the restrictor and the air intake branches, and a pressure-equalizing pipe is arranged between the first and second pressure-stabilizing cavities. By the arrangement, pressure of air flowing into the cylinders can be balanced, air snatching among the neighboring air intake branches is avoided, engine jittering caused by insufficient intake pressure due to transient urgent acceleration or deceleration is avoided, stability of the air intake system of an engine is improved, and dynamic performance, economical efficiency and emission performance of the engine are improved.

Description

technical field [0001] The invention relates to an engine intake system, in particular to a pressurized gasoline engine intake system provided with double stabilizing chambers, belonging to the technical field of internal combustion engines. Background technique [0002] With the development of automobile manufacturing technology, high-performance engines have become the goal pursued by manufacturers for new product development, especially the research on the organization of intake air flow in the engine intake system, reducing the flow resistance of the intake pipeline, and improving the charging efficiency have been well received by the industry. people's attention. [0003] The structure of the engine intake system is of great significance for organizing proper airflow, promoting flame propagation, and reducing HC emissions. Since the air intake system of the gasoline engine currently has a single pressure-stabilizing chamber between the intake branch pipe and the thrott...

AI Technical Summary

Problems solved by technology

Since the air intake system of the gasoline engine currently has a single pressure-stabilizing chamber between the intake branch pipe and the throttle valve, the balance effect on the airflow pressure is poor. , The method of exhaust time, that is, the early opening and late closing of the intake valve and the early opening and late closing of the exhaust valve, especially when the supercharged engine is under low speed and high load conditions, in order to obtain a better scavenging effect, the The valve overlap angle increases, so the intake advance angle also increases

For example, the ignition sequence of a four-cylinder gasoline engine is one, three, four, two, and there is a simultaneous intake phenomenon in the late stage of the intake stroke of the second cylinder and the initial stage of the intake stroke of the first cylinder, which will interfere with each other and grab air; Similarly, there is a simultaneous intake phenomenon in the late stage of the intake stroke of the third cylinder and the initial stage of the intake stroke of the fourth cylinder. Due to the phenomenon of air grabbing between the intake branch pipes of adjacent cylinders, the intake efficiency is low, and the rapid acceleration during the transient Or when decelerating rapidly, it is easy to cause insufficient intake air, slow response, and engine vibration

In addition, the existing gasoline engine air intake system is not equipped with a system pressure balance device and a pressure detection device inside the plenum chamber, so real-time monitoring of the pressure fluctuation inside the plenum chamber cannot be realized during the intake process

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