Closed-Loop Engine Combustion Control With Adaptive Injector Maps
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Solution Overview
Problem
Existing closed-loop combustion control systems struggle to achieve balanced combustion across multiple cylinders due to variations in engine configuration, fuel injector differences, and aging, leading to performance deterioration.
Innovation Solution
A three-level closed-loop combustion control strategy using a base compensation map, adaptive map, and feedback controller to compensate for engine configuration and injector differences, with an adaptive map that learns and adjusts to injector aging over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple feedback controller is used for closed-loop combustion control, then the control system is simple, but it cannot achieve balanced combustion across multiple cylinders due to variations in engine configuration and injector differences
Solution Approach 1:
The patent divides the combustion control into three separate levels: base compensation (addressing engine configuration variations), injector-specific compensation (addressing injector differences), and feedback control (real-time adjustment). This segmentation allows each level to address specific sources of combustion variability independently, achieving balanced combustion across all cylinders while maintaining systematic simplicity.
Solution Approach 2:
The patent applies preliminary compensation through base compensation maps and injector-specific compensation maps before the feedback controller operates. These pre-calculated compensation values account for known variations in engine configuration and injector characteristics, allowing the simple feedback controller to focus only on real-time adjustments rather than trying to compensate for all variations simultaneously.
2Device complexity
If injector variations and aging are not compensated, then the control system remains simple, but combustion balance deteriorates over time
Solution Approach 1:
The patent pre-calculates and stores compensation values for different injector conditions and aging states in compensation maps. During operation, the system selects appropriate compensation values based on injector age or condition without requiring real-time complex analysis, thus maintaining simple control logic while accounting for injector variations and aging effects.
Solution Approach 2:
The patent introduces compensation parameters that adjust injection timing and duration based on injector-specific characteristics and aging. By changing these control parameters according to pre-determined compensation values, the system maintains combustion consistency across different injector conditions without increasing the fundamental control system complexity.
3Reliability
If individual cylinder control is implemented, then combustion balance is improved, but the control system complexity increases
Solution Approach 1:
The patent segments the control system into three distinct functional layers: base compensation (common to all cylinders), injector-specific compensation (specific to each injector), and feedback control (cylinder-specific real-time adjustment). This segmentation allows individual cylinder control to be achieved while reusing common compensation data across multiple cylinders, reducing overall system complexity.
Solution Approach 2:
The base compensation map serves all cylinders simultaneously, providing universal compensation for engine configuration variations. The injector-specific compensation maps are reused across multiple operating conditions, and the feedback controller uses a standardized algorithm for each cylinder. This multi-functionality reduces the total complexity compared to implementing completely independent control for each cylinder.
Data Source
AI summary
The present disclosure relates to a device for applying a closed-loop combustion control for an engine having plural cylinders, comprising: a plurality of fuel injectors for supplying fuel into each one of the plurality of cylinders of the engine, a plurality of pressure sensors, wherein in or at each of the plurality of cylinders one of the plurality of pressure sensors is arranged for determining the pressure therein, and an electronic control unit for receiving the sensor values obtained by the plurality of pressure sensors and for controlling injection parameters of the plurality of fuel injectors, optionally for controlling fuel quantity and/or injection timing, wherein the electronic control unit is configured to individually perform a closed-loop combustion control strategy for each of the cylinders of the engine.