Variable Fuel Injector Timing Compensation for Direct Injection
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Solution Overview
Problem
In direct injection engine systems, constant response time delays used for fuel injectors lead to inaccurate fuel metering and cylinder imbalance due to varying operating conditions, causing noise, vibration, reduced fuel economy, and increased emissions, especially during split injection modes where fuel pressure and needle bounce affect response times.
Innovation Solution
A control method that adjusts fuel injection timing by recognizing transient conditions such as needle bounce and modifying opening delays based on fuel pressure and needle behavior, using response time delay maps to ensure accurate fuel metering across varying operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If constant response time delays are used for fuel injectors, then fuel control strategy is simple, but fuel metering becomes inaccurate under varying operating conditions
Solution Approach 1:
The patent applies dynamics by transitioning from constant response time delays to variable delay values that adapt to changing operating conditions. The control system dynamically adjusts opening delay and closing delay based on detected operating parameters such as fuel pressure, engine temperature, and injection event characteristics, enabling accurate fuel metering across diverse operating scenarios while maintaining manageable control complexity through systematic adaptation.
Solution Approach 2:
The patent implements parameter changes by modifying the response time delay parameters based on operating conditions. The system changes opening delay and closing delay values according to detected parameters including fuel pressure, engine temperature, and injection timing, thereby maintaining fuel metering accuracy across varying operating conditions without requiring overly complex control architecture.
2Device complexity
If constant response time delays are used, then control system is simple, but cylinder imbalance occurs leading to increased NVH
Solution Approach 1:
The system dynamically adjusts response time delays based on real-time operating conditions to prevent cylinder imbalance. By adapting opening and closing delays according to detected parameters such as fuel pressure and injection timing, the control system maintains balanced fuel delivery across all cylinders, thereby reducing NVH without requiring overly complex control architecture.
Solution Approach 2:
The patent employs feedback mechanisms where the control system detects operating conditions and adjusts response time delays accordingly. This feedback loop ensures that fuel injection timing remains optimized under varying conditions, preventing cylinder imbalance and associated NVH while maintaining reasonable control system complexity through systematic adaptation.
3Device complexity
If constant response time delays are used, then fuel injection timing is simplified, but fuel economy deteriorates due to rich operation
Solution Approach 1:
The system dynamically optimizes fuel injection timing by adjusting response time delays based on detected operating conditions. This enables precise fuel metering that adapts to changing engine states, preventing rich operation and improving fuel economy while maintaining manageable timing complexity through systematic parameter adaptation.
Solution Approach 2:
The patent implements parameter changes in fuel injection timing based on operating conditions such as fuel pressure, engine temperature, and injection event characteristics. This dynamic adjustment ensures optimal fuel delivery that improves fuel economy across varying conditions without requiring overly complex timing control.
4Device complexity
If constant response time delays are used, then control strategy is simple, but emissions increase due to inaccurate fuel metering
Solution Approach 1:
The control strategy dynamically adjusts response time delays based on detected operating conditions to maintain accurate fuel metering. This adaptation ensures complete combustion and reduces harmful emissions while managing control complexity through systematic parameter adjustment rather than overly complex control architecture.
Solution Approach 2:
The patent employs feedback mechanisms where the control system continuously monitors operating conditions and adjusts fuel injection timing accordingly. This feedback loop ensures accurate fuel metering that reduces emissions while maintaining reasonable control strategy complexity through systematic adaptation to changing conditions.
5Device complexity
If uniform opening delay is applied to all operating conditions, then control implementation is simple, but fuel metering accuracy decreases under varying conditions
Solution Approach 1:
The system transitions from uniform to dynamic opening delay application, adjusting delay values based on detected operating conditions such as fuel pressure, engine temperature, and injection timing. This dynamic approach maintains fuel metering accuracy across varying conditions while managing implementation complexity through systematic parameter adaptation.
Solution Approach 2:
The patent implements parameter changes in opening delay based on operating conditions. The control system adjusts delay values according to detected parameters including fuel pressure and engine temperature, thereby maintaining fuel metering accuracy across diverse operating conditions without requiring overly complex implementation.
Data Source
AI summary
A method for controlling fuel injection timing of at least one fuel injector in a direct injection fuel delivery system of an internal combustion engine is presented. In one example, the timing of a second fuel pulse in a combustion cycle is adjusted in response to injector needle position bounce. The method can improve fuel delivery control.