Engine

Abstract

The invention discloses an engine. An air outlet system, an air inlet system and an EGR valve are included, wherein the EGR valve is connected with the air outlet system and the air inlet system. Whenthe pressure difference of the air outlet system and the air inlet system reaches the set value, the air outlet backpressure of the air outlet system is increased, and accordingly the amount of wastegas entering the air inlet system through the EGR valve is increased. According to the engine, in the high load work condition at the engine low rotation speed, the air outlet backpressure is increased, and the purpose of higher EGR efficiency is achieved. The scheme is simple and reliable, combustion economical efficiency of the engine is improved, and the economical efficiency of the engine ishigh.

Description

technical field [0001] The invention relates to an engine. Background technique [0002] Due to the increasingly stringent regulations, the requirements for engine fuel consumption and emissions are getting higher and higher. The application of EGR (Exhaust Gas Recirculation) technology has become an important technical means for reducing fuel consumption and emissions of gasoline engines today. It is significantly reducing NOx While reducing emissions, it also improves engine combustion economy. [0003] EGR technology has been widely used in gasoline engines. Gasoline engines are divided into two types: naturally aspirated engines and supercharged engines. These two types of engines will encounter a problem when using EGR technology: when the engine is running at low speed and medium to high load, the exhaust of the engine will The air pressure is relatively low, the exhaust energy is weak, and the intake system does not form enough negative pressure because the throttle...

AI Technical Summary

Problems solved by technology

Gasoline engines are divided into two types: naturally aspirated engines and supercharged engines. These two types of engines will encounter a problem when using EGR technology: when the engine is running at low speed and medium to high load, the exhaust of the engine will The air pressure is relatively low, the exhaust energy is weak, and the intake system does not form enough negative pressure because the throttle body is close to full opening. At this time, the pressure difference between the intake and exhaust systems is relatively small. Even if the EGR valve is fully opened, Also not much exhaust gas from the exhaust system can re-enter the intake system to participate in combustion

At this time, although the engine still has the potential to continue to increase EGR gas, due to the similar intake and exhaust pressures, there is not enough exhaust gas to enter the intake system, which cannot meet the engine's demand for reducing fuel consumption.

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