Multi-stage supercharging flexible air system with electric supercharging function for engine

Abstract

The invention provides a multi-stage supercharging flexible air system with an electric supercharging function for an engine. The multistage supercharging flexible air system involves an electric supercharger, the engine, a turbocharger, an air storage tank and a controller, wherein an air inlet communicates with the air inlet end of a first air compressor of the electric supercharger through a pipeline, the air inlet communicates with the air inlet end of a second air compressor of the turbocharger through a pipeline, and a one-way valve is arranged on the pipeline; the air outlet end of thefirst air compressor communicates with the air inlet end of the second air compressor through a pipeline; the air outlet end of the second air compressor communicates with an air inlet pipe of the engine through a pipeline via an air inlet intercooler and an air inlet heater; an air outlet pipe of the engine communicates with a turbine air inlet end of the turbocharger; the output end of the controller is electrically connected with a motor of the electric supercharger; the motor is used for driving the first gas compressor to operate; and a turbine of the turbocharger drives the second air compressor to operate through exhaust energy of the air outlet pipe of the engine.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a multi-stage supercharging flexible air system with electric supercharging for an engine. Background technique [0002] Turbocharging is a technology that uses the exhaust gas generated by the engine to drive the air compressor. The purpose of supercharging is to increase the intake air volume of the engine without increasing the displacement of the engine, increase the equivalent compression ratio of the engine, and thereby increase the power density and torque density of the engine. [0003] When the engine is working, the high-temperature and high-pressure exhaust gas from the exhaust impacts the turbine blades at a high speed at a certain angle, driving the turbine to rotate at a high speed, and the turbine drives the coaxial compressor impeller to rotate at a high speed, so that the air is pressurized and enters the cylinder. When the engine speed increases, th...

AI Technical Summary

Problems solved by technology

[0004] Generally, turbocharged engines have insufficient boost pressure at low speeds due to insufficient exhaust gas capacity, which limits the increase in fuel injection volume, resulting in poor torque performance at low speeds, which is detrimental to the power performance of the car

[0005] Turbocharging cannot take into account both low-speed and high-speed performance at the same time. Reducing the turbocharger volute will improve low-speed performance. However, in order to prevent the supercharger from overspeeding at high speeds, a waste gas bypass is used to bypass part of the engine's exhaust, thereby losing Part of the exhaust gas energy, resulting in a decrease in efficiency

On the other hand, enlarging the supercharger volute improves high-rpm performance, but results in poorer efficiency and responsiveness at lower rpm

[0006] Slow engine response at low rpm due to turbocharger aerodynamic lag

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