Fuel Injection Control with Adaptive Staging for Capacitor Stability
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Solution Overview
Problem
Existing multi-stage injection systems for internal combustion engines are limited by the number of injections, impairing the effectiveness of the multi-stage injection process due to constraints on the charging time of the boost capacitor.
Innovation Solution
An injection control apparatus that includes a controller to dynamically adjust the target number of injections and injection timing based on engine operating conditions, reducing the number of injections when intervals are insufficient to prevent capacitor voltage drop and ensure adequate charging, thereby maintaining multi-stage injection efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of injections is increased to improve multi-stage injection effectiveness, then combustion performance is improved, but the charging time of the boost capacitor becomes insufficient and voltage drop occurs
Solution Approach 1:
The patent applies dynamics by making the injection control system adaptive to changing operating conditions. The controller dynamically adjusts injection parameters (number of injections, timing, duration) based on real-time detection of capacitor voltage levels and engine operating conditions (load, rotation speed, temperature). This dynamic adjustment allows the system to optimize multi-stage injection effectiveness while preventing capacitor voltage drop by reducing injection frequency when voltage is insufficient.
Solution Approach 2:
The patent implements feedback control by continuously monitoring capacitor voltage and engine operating conditions, then using this information to adjust the number and timing of injections. The controller detects whether the capacitor voltage has dropped below a threshold value and modifies injection commands accordingly. This closed-loop feedback mechanism resolves the contradiction by balancing injection effectiveness with capacitor charging requirements.
2Quantity of substance
If the injection frequency is increased to meet fuel demand under high load conditions, then fuel supply is improved, but the booster circuit cannot recharge the capacitor sufficiently
Solution Approach 1:
The patent applies partial action by selectively performing multi-stage injection only when capacitor voltage is sufficient, and switching to single-stage or reduced-stage injection when voltage is insufficient. Rather than always attempting maximum fuel injection, the system adjusts injection quantity and staging based on available energy in the capacitor, preventing voltage drop while still meeting fuel demand when possible.
Solution Approach 2:
The patent changes operational parameters (injection timing, duration, number of stages) based on capacitor voltage levels and engine conditions. When voltage is sufficient, the system uses multiple injection stages with optimized timing. When voltage drops, the system reduces injection frequency or consolidates to single-stage injection, thereby adjusting fuel delivery to match available energy while preventing capacitor over-discharge.
3Productivity
If multi-stage injection is performed with short intervals to improve combustion efficiency, then burning efficiency is improved, but the capacitor voltage drops due to insufficient charging time
Solution Approach 1:
The system dynamically adjusts injection interval timing based on capacitor voltage state. When voltage is sufficient, short injection intervals are maintained to achieve good combustion efficiency. When voltage drops below threshold, the controller extends injection intervals or reduces the number of injection stages, allowing the capacitor to recharge between injections while preventing voltage collapse.
Solution Approach 2:
The controller uses feedback from voltage detection to adjust injection timing and intervals. When multi-stage injection with short intervals is detected to cause voltage drop, the system modifies subsequent injection timing to allow adequate capacitor recharge time, thereby maintaining both combustion efficiency and voltage stability through continuous adaptation.
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
The apparatus enhances combustion and emission performance by preventing capacitor voltage drop and ensuring adequate fuel injection, even under high load and high rotation conditions, thus improving the effectiveness of multi-stage injection.
Implementation Method 1
a booster circuit configured to boost electric power from the battery
Implementation Method 2
an electromagnetic solenoid that opens a valve of the injector when a predetermined voltage or more is applied
Data Source
AI summary
Injection control apparatus includes: injector, drive circuit including battery, booster circuit, and current supply circuit, and controller configured to perform: setting target number of injections and target injection timing per combustion cycle based on operating condition of engine; determining whether first interval from valve opening timing of first injection to valve opening timing of second injection is first threshold value or longer and whether second interval from valve opening timing of second injection to valve opening timing of third injection is second threshold value or longer based on target number of injections and target injection timing, first, second, and third injections being three consecutive injections in one single combustion cycle or two consecutive combustion cycles; and reducing target number of injections when it is determined that first interval is shorter than first threshold value and second interval is shorter than second threshold value.