NOx Control Device Optimizing Fuel Consumption via EGR Valve Adjustment
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Solution Overview
Problem
Conventional NOx control systems in vehicles fail to maintain optimal NOx exhaust levels suitable for varying driving patterns, leading to suboptimal fuel consumption during exhaust gas test measurements.
Innovation Solution
A NOx generation amount control device that calculates and adjusts NOx exhaust amounts based on detected concentrations, cumulative amounts, and engine parameters, using a system comprising an exhaust amount calculating part, cumulative amount calculating part, specifying part, estimating part, judging part, and determining part to control the opening degrees of valves and a turbocharger, ensuring NOx exhaust levels align with travel patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the engine is controlled to exhaust a lower NOx amount to meet target values, then NOx emission compliance is improved, but fuel consumption deteriorates
Solution Approach 1:
The system performs preliminary estimation of the predicted cumulative NOx amount based on current engine operation state and travel distance before making control decisions. This allows the control device to proactively adjust valve openings and turbocharger settings to maintain optimal NOx levels without excessive reduction, thereby avoiding unnecessary fuel consumption while ensuring compliance with emission targets.
Solution Approach 2:
The control system dynamically adjusts the opening degrees of intake/exhaust valves and turbocharger based on real-time conditions including rotation speed, fuel injection amount, and cumulative NOx amount. This dynamic adaptation allows the engine to operate at optimal efficiency points for each driving pattern while maintaining NOx emissions within acceptable limits, rather than using fixed conservative settings that would increase fuel consumption.
2Object-generated harmful factors
If the engine is controlled to exhaust a lower NOx amount, then emission compliance is improved, but engine efficiency deteriorates
Solution Approach 1:
The system changes operational parameters (valve opening degrees, turbocharger opening, fuel injection amount) based on the relationship between rotation speed and cumulative NOx amount. By continuously adjusting these parameters according to the estimated predicted cumulative NOx amount and target values, the engine maintains optimal efficiency while ensuring NOx emissions comply with regulations for different driving patterns.
3Object-generated harmful factors
If target values are determined for each travel distance in multiple driving patterns, then emission regulation compliance is improved, but control complexity increases
Solution Approach 1:
The control device implements a feedback mechanism where the estimated predicted cumulative NOx amount is continuously compared with target values, and the valve/turbocharger openings are adjusted accordingly. This feedback-based approach simplifies control by using real-time monitoring and automatic adjustment rather than complex pre-programmed control strategies for each driving pattern, reducing control complexity while maintaining emission compliance.
Data Source
AI summary
A NOx generation amount control device includes: a cumulative amount calculating part calculating a cumulative NOx amount obtained by adding together a plurality of NOx exhaust amounts calculated for each prescribed time interval; a specifying part specifying a target value of the cumulative NOx amount associated with a movement distance of a moving body or an output value of an engine; an estimating part estimating a predicted NOx amount indicating a predicted cumulative NOx amount based on a rotation speed of the engine and a fuel injection amount; a judging part judging whether the sum of the predicted NOx amount and the cumulative NOx amount exceeds the target value; and a determining part determining a scheduled NOx exhaust amount and determining at least one of an opening degree of the EGR valve and an opening degree of a turbocharger.