EGR Intake Valve Layout for High Recirculation With Low Pumping Loss
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Solution Overview
Problem
Existing exhaust gas recirculation (EGR) systems suffer from low EGR rates due to improper positioning of air inlet control valves, leading to significant pumping losses and inefficient exhaust gas recirculation.
Innovation Solution
The EGR system optimizes the positioning of air inlet control valves and incorporates a pressurizer, catalyst, and angled exhaust gas return pipes to enhance the EGR rate while minimizing pumping losses, using specific distance and angle configurations to improve gas mixing and circulation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the air inlet control valve is mounted between the air inlet and air return port to generate negative pressure, then the EGR rate is improved, but pumping loss increases significantly
Solution Approach 1:
The patent changes the positioning parameter of the air inlet control valve, specifically setting the distance S from the air return port to the control valve to satisfy S/D≤2 (where D is the inner diameter of the air inlet pipe). This parameter optimization reduces the pumping loss while maintaining the negative pressure effect needed for EGR flow, resolving the contradiction between EGR rate improvement and energy loss.
2Loss of energy
If the air inlet control valve is positioned improperly, then pumping loss is reduced, but the EGR rate becomes relatively low
Solution Approach 1:
The patent optimizes the positioning parameter of the air inlet control valve by defining the distance S from the air return port such that S/D≤2 (where D is the inner diameter of the air inlet pipe). This specific parameter range ensures both reduced pumping loss and sufficient negative pressure generation to maintain high EGR rate, simultaneously addressing both requirements.
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
The system achieves a high EGR rate with reduced pumping losses, resulting in lower fuel consumption and improved engine performance.
Implementation Method 1
Under a throttling effect generated by the air inlet control valve, negative pressure is formed at the air return port, thereby improving the EGR rate.
Implementation Method 2
The EGR system further includes a pressurizer. The pressurizer has a first end and a second end. The first end is disposed on the exhaust pipe. The first end is located between the engine and the exhaust gas return pipe.
Data Source
AI summary
An engine assembly includes an air inlet pipe having an air inlet, an air supply port, and an air return port. The air inlet communicates with air. The air supply port communicates with an air inlet manifold of an engine. In a length direction of the air inlet pipe, the air return port is located between the air inlet and the air supply port. An air inlet control valve is disposed on the air inlet pipe, and located between the air inlet and the air return port. An exhaust gas return pipe communicates with the air return port. An exhaust pipe communicates with the exhaust gas return pipe and an exhaust manifold of the engine. In the length direction of the air inlet pipe, a distance S between the air return port and the air inlet control valve and an inner diameter D of the air inlet pipe meet S/D≤2.