Electrically assisted turbocharging system and control method thereof

Abstract

The invention discloses an electrically-aided turbocharging system, and belongs to the technical field of turbocharging. The invention aims at providing an optimized electrically-aided turbocharging system adequately utilizing a turbine body structure, and a control method thereof. One end of the electrically-aided turbocharger disclosed by the invention is installed at an inlet end of an intake channel, and the other end of the electrically-aided turbocharger is installed at an outlet end of an exhaust channel; the electrically-aided turbocharger is composed of an aiding high-speed motor, a compressor, a turbocharger rotary shaft, a turbine and a waste gas bypass valve device; an intercooler is installed on the intake channel; an intake branch pipe is connected to a tail end of the intake channel; an exhaust branch pipe is connected to an inlet end of the exhaust channel; a gasoline engine cylinder is directly connected between the intake branch pipe and the exhaust branch pipe; the exhaust channel behind the exhaust branch pipe is divided into a first passage and a second passage which are connected in parallel; and tail ends of the first passage and the second passage both communicate with an outlet pipeline. According to the electrically-aided turbocharging system disclosed by the invention, the high-speed motor is combined with the turbocharger with the waste gas bypass valve, thus the influence of waste gas turbocharging for the performance of a gasoline engine is furthest utilized.

Description

technical field [0001] The invention belongs to the technical field of turbocharging. Background technique [0002] Since turbocharging has the advantages of reducing engine size, improving power performance and reducing emissions, it has become an important development direction of engine technology. The turbocharger uses the energy of the exhaust gas to drive the turbine to do work, and the rotating turbine drives the coaxial compressor impeller to compress fresh air, so that the pressurized air is sent to the cylinder, thereby increasing the power output of the engine. There are two main problems in the matching of the traditional turbocharger and the engine: when the engine is running at low speed, the exhaust gas energy is insufficient, resulting in the low speed of the turbocharger, which cannot provide sufficient boost pressure and intake air volume, resulting in insufficient engine output power; When running at high speed, the excess energy of the exhaust gas causes...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to make full use of the optimization of the turbine body structure to solve the problems of slow transient response and insufficient low-speed torque in the turbocharger, and an electric auxiliary turbocharging system and its control method

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