Two-stage supercharging system, engine and engine intake and exhaust pressure difference control method

Abstract

The invention relates to the technical field of engines, and particularly discloses a two-stage supercharging system, an engine and an engine intake and exhaust pressure difference control method. The two-stage supercharging system comprises a first turbocharger, a second turbocharger and an exhaust bypass device, wherein the first turbocharger comprises a first air compressor; the second turbocharger comprises a second air compressor; the first air compressor and the second air compressor are sequentially arranged between an air inlet and the engine at intervals; a first air cooler is arranged between the first air compressor and the second air compressor and provided with a temperature adjusting assembly; the exhaust bypass device is used for adjusting the amount of waste gas passing through the first turbocharger and / or the second turbocharger; a first pressure sensor and a second pressure sensor are used for detecting the intake pressure and the exhaust pressure of the engine correspondingly; and a controller controls the temperature adjusting assembly through data of the first pressure sensor and the second pressure sensor. By means of the arrangement, the intake pressure and the intake and exhaust pressure difference of the engine can be effectively, independently and accurately adjusted.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a two-stage supercharging system, an engine and a method for controlling the pressure difference between intake and exhaust of the engine. Background technique [0002] Engine power continues to increase, and turbocharging is an important means to increase engine power. Limited by the technology of the supercharger itself, it is difficult to greatly increase the pressure ratio of a single-stage supercharging system. Therefore, the application of the two-stage supercharging system on the engine is gradually increasing. [0003] The supercharging pressure output by the supercharging system, that is, the intake pressure of the engine, is an important parameter of the engine, which directly affects the combustion and performance of the engine. It is easily affected by the ambient intake temperature and pressure. Too high supercharging pressure will cause The mechanical load such as ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a two-stage supercharging system, an engine and a method for controlling the pressure difference between intake and exhaust of the engine, so as to solve the problem that the engine cannot meet the requirements of the two aspects of the intake pressure and the pressure difference between the intake and exhaust.

Images