Pneumatic-internal combustion hybrid secondary air injection system using exhaust of pneumatic motor

Abstract

The invention relates to the pneumatic-internal combustion hybrid technology, and aims to provide a pneumatic-internal combustion hybrid secondary air injection system using exhaust of a pneumatic motor. The system comprises a pneumatic motor, an internal combustion engine and a high-pressure air tank, wherein the high-pressure air tank also serves as an inlet air source of the pneumatic motor aswell as a backup secondary air source for the stopping of the pneumatic motor. An exhaust pipe of the internal combustion engine is provided with an oxygen sensor for detecting the oxygen concentration in the exhaust pipe; and an electronic control unit (ECU) 19 controls the opening / closing moment and opening amplitude of an electromagnetic valve on each pipeline according to the working condition of the internal combustion engine and the oxygen concentration in the exhaust pipe so as to control the secondary air injection technique. The system provided by the invention can make full use of the exhaust of the pneumatic motor as a secondary air source, recycles part of the energy, provides oxygen for the exhaust postprocessing of the internal combustion engine, and uses the high-pressure air in the high-pressure air tank as the backup secondary air source. Besides, the system can reduce the utilization frequency of a secondary air pump in the secondary air injection system of the internal combustion engine, and reduce the consumption of the output power of the internal combustion engine.

Description

technical field [0001] The invention relates to the pneumatic-internal combustion hybrid power technology, in particular to a pneumatic-internal combustion hybrid secondary air injection system utilizing exhaust gas from an air motor. Background technique [0002] In order to meet the increasingly stringent automobile emission regulations, it is necessary to install catalytic converters and secondary air injection in the exhaust system of internal combustion engines to effectively control automobile exhaust emissions. [0003] The traditional secondary air injection system mainly has two types: passive mode and active mode: the passive mode is to use the pressure difference inside and outside the tube when the pressure in the exhaust pipe fluctuates, and when the pressure in the exhaust pipe is negative, the air is sucked into the pipe, and the passive method is Although the method has a simple structure and does not directly consume engine power, it cannot control the air v...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the active air injection valve consuming internal combustion engine power and the passive air injection volume cannot be controlled, and to provide a secondary air injection system for a pneumatic-internal combustion hybrid engine that utilizes exhaust

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