Engine Combustion Control Adjusting Injection Ignition Timing
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Solution Overview
Problem
Internal combustion engines face challenges in controlling fuel injection and ignition timing to prevent knocking and ensure homogeneous mixture formation, especially under high-load operations where deviations in fuel pressure can lead to inefficient combustion and emission issues.
Innovation Solution
A combustion control device that includes a fuel injection device, an ignition device, and a fuel pressure sensor, which adjusts injection and ignition timings based on detected fuel pressure to match target pressures, using a timing computation unit and timing correction unit to optimize fuel injection and ignition for stable combustion and knocking resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If fuel injection timing is advanced to improve combustion efficiency, then engine output increases, but knocking resistance deteriorates
Solution Approach 1:
The patent applies dynamics by making the injection timing adjustable based on operating conditions. The ECU dynamically corrects injection timing based on detected fuel pressure deviations from target pressure, allowing the system to optimize between power and knocking resistance for different operating states rather than using fixed timing
Solution Approach 2:
The patent changes the injection timing parameter based on fuel pressure conditions. When fuel pressure deviates from target pressure, the ECU calculates a correction amount and adjusts the injection timing accordingly, transforming a static parameter into a dynamically optimized one that adapts to actual fuel delivery conditions
2Manufacturing precision
If fuel pressure is increased to improve injection precision, then mixture formation improves, but fuel system complexity increases
Solution Approach 1:
The patent implements feedback control by using a fuel pressure sensor to detect actual fuel pressure and comparing it to target pressure. The ECU calculates the deviation and applies correction amounts to injection timing based on this feedback, allowing the system to maintain precision without requiring excessively high fuel pressure
Solution Approach 2:
The patent replaces mechanical pressure increase solutions with electronic control. Instead of mechanically increasing fuel pressure to improve injection precision, the system uses electronic sensing and computational correction to achieve precise injection timing based on actual pressure conditions
3Object-affected harmful factors
If injection timing is retarded to reduce knocking, then knocking resistance improves, but combustion efficiency deteriorates
Solution Approach 1:
The system dynamically adjusts injection timing based on real-time fuel pressure detection. Rather than statically retarding timing to prevent knocking, the ECU calculates optimal timing corrections based on actual pressure conditions, allowing advanced timing when appropriate while preventing knocking when pressure conditions require
Solution Approach 2:
The patent changes injection timing parameters based on detected fuel pressure. The ECU calculates correction amounts that optimize the balance between knocking resistance and combustion efficiency for each operating condition, transforming fixed timing into adaptive timing that responds to actual fuel system state
Data Source
AI summary
A timing computation unit determines whether to execute compression latter-half injection to inject fuel in a latter half of a compression stroke of an internal combustion engine based on an operation state of the engine and computes an injection timing and an ignition timing of fuel. A timing correction unit corrects the computed injection timing to an advance side and corrects the computed ignition timing to a retard side, in a case where a detected fuel pressure is lower than a target fuel pressure. The timing correction unit corrects the computed injection timing to the retard side and corrects the computed ignition timing to the advance side, in a case where the detected fuel pressure is higher than the target fuel pressure. A combustion control unit controls a fuel injection device and an ignition device based on the injection timing and the ignition timing.