Adaptive EGR Valve Actuation for Foreign Matter Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing EGR control systems for internal combustion engines face inefficiencies in removing foreign matters from the EGR passage, as the current methods do not accurately assess deposition intensity and quantity, leading to either excessive energy consumption or insufficient cleaning.
Innovation Solution
An EGR control apparatus with a control unit that detects deposition intensity and quantity, and adjusts the EGR valve's actuation intensity and frequency based on a calculated foreign-matter accumulation index to optimize foreign matter removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EGR valve is actuated for a predetermined number and intensity irrespective of deposition conditions, then the EGR passage can be cleaned, but energy is wasted when deposition is minimal
Solution Approach 1:
The EGR valve actuation parameters (number of times and intensity) are changed dynamically based on the detected deposition conditions. The control unit adjusts the cleaning operation intensity and frequency according to the actual foreign matter accumulation level, transitioning from fixed predetermined values to adaptive variable values.
Solution Approach 2:
The cleaning operation parameters such as the number of EGR valve actuations and actuation intensity are modified based on the deposition detection results. When deposition is detected to be low, the cleaning parameters are reduced; when deposition is high, the cleaning parameters are increased accordingly.
2Device complexity
If the EGR valve is actuated with fixed predetermined intensity, then the control system is simple, but foreign matters cannot be sufficiently removed when deposition is severe
Solution Approach 1:
A feedback mechanism is introduced where the deposition detection unit continuously monitors the EGR passage conditions and provides information to the control unit. The control unit then adjusts the EGR valve actuation parameters based on this feedback, creating a closed-loop control system that adapts to actual deposition conditions.
Solution Approach 2:
The fixed mechanical actuation system is replaced with an electronically controlled system that can vary actuation parameters. The EGR valve actuation is controlled by an actuator that can adjust the number of times and intensity of actuation based on electronic signals from the control unit, enabling flexible parameter adjustment.
3Reliability
If the EGR valve actuation intensity is increased to ensure thorough cleaning, then foreign matters are removed more effectively, but energy consumption and noise increase
Solution Approach 1:
Instead of always applying full-intensity cleaning, the system applies partial cleaning action when deposition is minimal and excessive (high-intensity) action only when deposition is severe. This matches the cleaning intensity to the actual need, avoiding both insufficient and excessive cleaning.
Solution Approach 2:
The actuation intensity parameter of the EGR valve is changed based on deposition detection results. When deposition intensity is low, the actuation intensity is reduced; when deposition intensity is high, the actuation intensity is increased, optimizing energy usage while maintaining cleaning effectiveness.
Data Source
AI summary
An ECU calculates a foreign-matter accumulation index base on a total flow rate of EGR gas integrated since the previous execution of a last foreign-matter removal operation until the present execution of the foreign-matter removal operation. The ECU controls an actuator for operating an EGR valve and a number of the actuations of the EGR valve on the basis of the foreign-matter accumulation index. When the total flow rate of the EGR gas increases, the quantity of foreign matters contained in EGR gas correspondingly increases. Therefore, as the foreign-matter accumulation index becomes larger, the actuation intensity of the EGR valve is set higher and the number of the actuations of the EGR valve is set larger. As a result, the removal operation of foreign matters can be efficiently executed in accordance with the deposition intensity or the deposition quantity of foreign matters.