Engine Exhaust Gas Recirculation Control for Altitude Emissions
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Solution Overview
Problem
Compression-ignition engines, such as diesel engines, face challenges in controlling exhaust emissions and specific fuel consumption, especially in extreme environmental conditions like high altitudes, where ambient conditions adversely affect engine performance and efficiency, making it difficult to maintain emissions and fuel consumption within specific limits.
Innovation Solution
A system and method that involves a turbocharged engine with a turbine and exhaust gas recirculation, where a control unit adjusts the feed and recirculation of exhaust gases as a function of intake manifold air temperature and pressure, optimizing fuel injection timing and engine speed to maintain specific fuel consumption and exhaust emission levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the engine operates at full load in extreme ambient conditions (high altitude, low temperature), then power output is maintained, but exhaust emissions exceed design limits and specific fuel consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of the air-fuel ratio and exhaust gas recirculation rate based on real-time ambient condition sensing. The control system varies these parameters as functions of intake manifold air temperature and pressure, allowing the engine to adapt its operation to maintain power output while controlling emissions under varying extreme conditions.
Solution Approach 2:
The patent changes key operating parameters (air-fuel ratio, exhaust gas recirculation rate) in response to ambient condition changes. By adjusting these parameters as functions of intake manifold air temperature and pressure, the system maintains optimal combustion characteristics across different altitude and temperature conditions, preventing emission exceedances while preserving power output.
2Power
If the engine operates at full load in extreme ambient conditions, then power output is maintained, but specific fuel consumption increases beyond design limits
Solution Approach 1:
The control system dynamically adjusts the air-fuel ratio based on ambient conditions to optimize combustion efficiency. By varying the air-fuel ratio as a function of intake manifold air temperature and pressure, the system ensures complete combustion across different operating conditions, maintaining power output while minimizing fuel consumption.
Solution Approach 2:
The patent adjusts the air-fuel ratio parameter in response to changing ambient conditions. This parameter change optimizes the combustion process under extreme conditions, ensuring that the engine maintains its power output capability while improving fuel efficiency and reducing specific fuel consumption.
3Object-generated harmful factors
If exhaust gas recirculation is increased to control emissions, then nitrogen oxide emissions are reduced, but engine performance and efficiency deteriorate
Solution Approach 1:
The patent implements dynamic control of exhaust gas recirculation rate based on ambient conditions. The control system adjusts the recirculation rate as a function of intake manifold air temperature and pressure, increasing recirculation when needed to control NOx emissions while decreasing it when ambient conditions allow for better performance, thus optimizing the trade-off between emissions and power output.
Data Source
AI summary
A method includes combusting air within a plurality of cylinders of an internal combustion engine by injecting a fuel into the plurality of cylinders. The method further includes expanding a first portion of an exhaust gas generated from the plurality of combustion cylinders via a turbine. The method further includes controlling at least one of feeding a second portion of the exhaust gas via an exhaust channel bypassing the turbine; and recirculating a third portion of the exhaust gas to the plurality of combustion cylinders via a recirculation channel, as a function of an intake manifold air temperature and pressure at which the engine is operated.