Two-stage supercharging system structure combining after-burning EGR and electric auxiliary turbine technology and control method thereof

Abstract

The invention aims to provide a two-stage supercharging system structure combining after-burning EGR and the electric auxiliary turbine technology and a control method thereof. According to the two-stage supercharging system structure combining the after-burning EGR and the electric auxiliary turbine technology and the control method thereof, an air inlet channel EGR working section communicates with an exhaust channel EGR working section through an after-burning channel and an EGR channel, an after-burning waste gas one-way valve, an after-burning combustion chamber and an after-burning EGR one-way valve are sequentially arranged on the after-burning channel from an exhaust manifold to an intake manifold, an EGR one-way valve is arranged on the EGR channel, a high-pressure stage turbine is connected to a power turbine through a clutch synchronizer, and the power turbine is connected to a motor and a generator through a switching device. The two functions of after-burning waste gas supplement and after-burning EGR can be achieved through one after-burning chamber and two one-way control valves, and therefore the low-speed large-torque characteristic of a high-supercharged diesel engine can be greatly improved, and the emission of NOx can be effectively reduced by controlling the EGR rate; and in addition, the waste gas energy can be stored and released through the electric auxiliary turbine technology, and therefore the increment of the inherent fuel consumption of an after-burning technology can also be reduced, and the economical efficiency can be improved.

Description

Technical field [0001] The invention relates to a diesel engine structure, specifically a diesel engine supercharging structure. Background technique [0002] Although the traditional bypass supplementary combustion supercharged diesel engine has good low-speed and high-torque characteristics, it is realized through supplementary combustion, which improves fuel consumption and greatly reduces its economy. The engine's gas consumption characteristics are roughly linear with the diesel engine speed The relationship is that the engine speed decreases, the amount of air passing through the diesel engine decreases, and the amount of bypass air passing through the bypass system increases. Therefore, simply applying supplemental combustion technology to achieve the low-speed and large-torque characteristics of a high-charge diesel engine. The lower the speed, the greater the fuel consumption. Its economy is worse. For a two-stage supercharged diesel engine, the boost pressure ratio is ...

AI Technical Summary

Problems solved by technology

For a two-stage supercharged diesel engine, the boost pressure ratio is very high, the intake air volume is large when the load is high, and the combustion temperature is high, and the NOx emission problem is obvious. For a high-charge diesel engine, the intake pressure is between The high working condition is generally higher than the exhaust pressure, which is not conducive to the realization of EGR measures that can effectively reduce NOx emissions

Images