D-EGR Engine Control System for Combustion Timing Precision
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Solution Overview
Problem
Existing D-EGR engine systems lack effective control over ignition timing and fuel rate, which are crucial for improving performance and reducing pollutants, despite attempts to address exhaust blowdown interference and uneven exhaust pulses.
Innovation Solution
A control system that receives cylinder pressure and crankshaft angle signals to determine the angular position and combustion time, allowing for selective adjustment of ignition timing and fuel rate in D-EGR engines, ensuring alignment with desired positions and times to optimize engine performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a D-EGR system is implemented to recirculate exhaust gas, then pollutants are reduced, but control over ignition timing and fuel rate becomes insufficient
Solution Approach 1:
The system dynamically adjusts ignition timing and fuel rate based on real-time cylinder pressure signals and crankshaft position. The ECU continuously modifies these parameters to optimize combustion while maintaining the D-EGR configuration, transforming static exhaust recirculation into a dynamically controlled combustion system.
Solution Approach 2:
The system uses cylinder pressure signals and crankshaft position feedback to continuously monitor combustion characteristics. This feedback loop enables the ECU to adjust ignition timing and fuel rate in response to actual combustion conditions, improving both pollutant reduction and operational control.
2Quantity of substance
If donor cylinders recirculate all exhaust gas, then EGR rate is maximized, but combustion timing precision deteriorates
Solution Approach 1:
The system changes combustion parameters (ignition timing, fuel rate) based on detected combustion characteristics. By adjusting these parameters in response to cylinder pressure analysis, the system maintains precise combustion timing control even with high exhaust gas recirculation rates from donor cylinders.
Solution Approach 2:
The system dynamically adapts ignition timing and fuel injection based on real-time combustion monitoring. This dynamic adjustment compensates for the timing variations introduced by high EGR rates, maintaining combustion precision while maximizing exhaust gas recirculation.
3Use of energy by moving object
If ignition timing is adjusted to improve combustion, then fuel efficiency increases, but system complexity increases
Solution Approach 1:
The system uses the engine's own cylinder pressure signals and crankshaft position data to automatically adjust ignition timing and fuel rate. This self-service approach improves fuel efficiency without requiring external complex control systems, as the engine monitors and adjusts its own combustion parameters.
Solution Approach 2:
The ECU performs multiple functions: monitoring cylinder pressure, determining crankshaft position, analyzing combustion characteristics, and adjusting ignition timing and fuel rate. This multi-functionality consolidates control complexity into a single existing component rather than adding separate dedicated systems.
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
This solution enhances the performance and efficiency of D-EGR engines by reducing pollutants, engine knock, and throttling losses, while improving fuel efficiency and maintaining desired combustion parameters.
Implementation Method 1
a cylinder pressure sensor configured to generate a cylinder pressure signal based on a pressure differential across the piston
Implementation Method 2
a crankshaft position sensor configured to generate a crankshaft angle signal based on an angular position of the crankshaft
Implementation Method 3
calculating, by the control system and based on the cylinder pressure signal and the crankshaft angle signal, a heat release rate for the cylinder
Implementation Method 4
selectively adjusting, by the control system, ignition timing of the cylinder based on whether the angular position matches the particular angular position
Implementation Method 5
selectively adjusting, by the control system, a fuel rate of a donor cylinder of the D-EGR engine based on whether the combustion time matches the particular combustion time
Implementation Method 6
An EGR system is a system designed to recirculate exhaust gas through combustion chambers of the engine by mixing at least some of the exhaust gas with fresh air entering the combustion chambers
Data Source
AI summary
A controller for a dedicated exhaust gas recirculation (D-EGR) engine is disclosed. The controller may receive a plurality of cylinder pressure signals, each of which is associated with a respective cylinder in a plurality of cylinders of the D-EGR engine. The plurality of cylinders includes at least one donor cylinder and a set of non-donor cylinders. The controller may receive a crankshaft angle signal associated with a crankshaft of the D-EGR engine. The controller may selectively adjust ignition timing of a cylinder, of the plurality of cylinders, based on the crankshaft angle signal and a cylinder pressure signal, of the plurality of cylinder pressure signals, associated with the cylinder; or a fuel rate of the at least one donor cylinder based on the crankshaft angle signal and a set of cylinder pressure signals, of the plurality of cylinder pressure signals, associated with the set of non-donor cylinders.