Engine intake and exhaust control system and control method

Abstract

The invention discloses an engine intake and exhaust control system and method. The engine intake and exhaust control system comprises an engine ECU, a gas circuit control valve and a double-effect pump. An exhaust gas bypass valve is arranged between an exhaust manifold and an exhaust pipe. The gas circuit control valve is connected with four gas circuits which are an EGR inlet pipe connected with the exhaust pipe, a bidirectional circulating pipe connected with an air inlet pipe, an intake branch pipe connected with an intake manifold and a pressurization gas pipe connected with the double-effect pump. The other end of the double-effect pump is connected with the intake branch pipe. On one hand, the double-effect pump serves as an EGR pump, enhances the capacity for introducing EGR exhaust gas and achieves stable adjustment of EGR within a whole working condition range; one the other hand, the double-effect pump serves as an electric air pressurizer, pressurizes air quickly and improves transient state response performance of an intake system. On-off conversion and control functions of the gas circuits are achieved through the gas circuit control valve, different requirements of an engine for recirculation exhaust gas or fresh air are met, and optimal power performance and exhaust performance are achieved.

Description

technical field [0001] The invention relates to an engine performance development control device and a control method, in particular to an engine intake and exhaust control method. Background technique [0002] With the increasingly stringent emission regulations, how to effectively improve the engine's power performance and reduce engine emissions while ensuring the engine's power performance and economic performance has become the focus of research and development. [0003] The working cycle of the engine is completed by multiple strokes. The intake and exhaust systems are the two important gas exchange boundaries of the open system of the engine. The oxygen in the system is completely controlled by the intake and exhaust systems, and the fuel that determines the power of the engine The amount of injection depends heavily on the amount of air entering the system, so the amount of air determines the power of the engine. [0004] The most common way to improve power perform...

AI Technical Summary

Problems solved by technology

Since the fuel is in a high-energy liquid form, the fuel injection volume is easy to increase rapidly through the original injection system, but it is difficult to meet the air volume required in the transient state, and the transient response is poor, which leads to certain limitations in the improvement of power performance

In addition, the size and weight of the supercharger of a large engine are also often larger, resulting in a larger cavity volume of the supercharger and a larger inertial mass of the rotor

In the process of vehicle acceleration, due to the action of inertial force, there is often a certain lag in the air movement and rotor movement of the turbocharger, resulting in poor engine acceleration performance and poor emission performance during variable operating conditions

[0007] Generally speaking, the current exhaust gas recirculation EGR system and turbocharging system on the engine cannot meet the requirements of power performance and emission performance in the full range of working conditions, and there are still many problems to be solved urgently

Images