Internal Combustion Engine Secondary-Air Routing for Low Emissions
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Solution Overview
Problem
Existing internal combustion engines struggle to achieve low-emission operations effectively.
Innovation Solution
A secondary air system is connected to the suction tract both upstream and downstream of the compressor, allowing air to be branched off and injected into the exhaust tract as secondary air, utilizing a secondary air pump to enhance the injection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If air is branched off only downstream of the compressor, then the secondary air system is simpler, but the quantity of secondary air available for injection is limited
Solution Approach 1:
The suction tract is divided into multiple branching points: a first branching point downstream of the compressor and a second branching point upstream of the compressor. This segmentation allows the secondary air system to draw air from multiple locations, increasing the total quantity of secondary air available for injection into the exhaust tract while maintaining a relatively simple system architecture.
2Object-generated harmful factors
If a large quantity of secondary air is injected into the exhaust tract, then emission control is improved, but the energy consumption increases
Solution Approach 1:
The system utilizes the compressor already present in the engine to provide the energy needed for air compression. By branching air from the suction tract at two different points, the system can inject a large quantity of secondary air into the exhaust tract for emission control without requiring an additional dedicated air supply system, thereby reducing overall energy consumption.
3Quantity of substance
If air is branched off upstream of the compressor, then more air is available for secondary injection, but the air pressure is lower
Solution Approach 1:
The secondary air system merges air from two different sources: air from downstream of the compressor (higher pressure) and air from upstream of the compressor (lower pressure but larger quantity). This combination allows the system to achieve both sufficient air pressure for effective injection and a large total quantity of secondary air for comprehensive emission control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables a particularly low-emission operation by introducing a large quantity of secondary air into the exhaust tract across all engine operating regions, enhancing emission control.
Implementation Method 1
a compressor is arranged to compress the air flowing through the suction tract
Implementation Method 2
The secondary air system has a secondary air pump, by means of which the air branched off at the second branching point can be fed through the secondary air system and fed to the introduction point
Data Source
AI summary
An internal combustion engine includes a suction tract, a compressor disposed in the suction tract, and an exhaust tract. A secondary air system is fluidically connected to the exhaust tract at an introduction point and to the suction tract at a first branching point downstream of the compressor where a part of air compressed by the compressor is branchable off from the suction tract and is introducible into the exhaust tract at the introduction point. The secondary air system is fluidically connected to the suction tract at a second branching point upstream of the compressor where a part of air is branchable off from the suction tract by the secondary air system and is introducible into the exhaust tract at the introduction point. Air branched off at the second branching point is feedable through the secondary air system and is feedable to the introduction point by a secondary air pump.