Multi-stage hybrid pressurizing system used for engine and provided with rear-arranged electric pressurizer

Abstract

The invention provides a multi-stage hybrid pressurizing system used for an engine and provided with a rear-arranged electric pressurizer. The system is characterized by comprising the electric pressurizer, the engine, a turbine pressurizer, an air storing tank and a controller. An air inlet communicates the air input end of a first air compressor of the turbine pressurizer through a pipeline. Theair output end of the first air compressor communicates with the air input end of a second air compressor through a pipeline. The air output end of the air storing tank communicates with the air input end of the second air compressor through a pipeline, and the pipeline is provided with a compressed air spray nozzle. The air output end of the second air compressor communicates with an air input pipe of the engine. The air output end of the first air compressor communicates with the air input pipe of the engine through a pipeline, and the pipeline is provided with a one-way valve. An air output pipe of the engine communicates with the turbine air input end of the turbine pressurizer. The air output end of the turbine pressurizer communicates with external air.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to a multi-stage hybrid supercharging system with electric supercharging behind. 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, the exhaust gas...

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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