Fuel Injection Control Device for Combustion Timing Optimization
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Solution Overview
Problem
Current fuel injection control devices for internal combustion engines face challenges in optimizing fuel injection timing to minimize harmful components like particulate matter (PM) and NOx in exhaust gas, as existing methods do not effectively adapt to varying engine operating conditions.
Innovation Solution
A fuel injection control device that includes an accumulator for high-pressure fuel, a direct injection fuel injection valve, and an exhaust gas sensor, which sets the fuel injection timing in the second half of the compression stroke when specific conditions are met, such as high temperature and elevated PM levels, to enhance combustion efficiency and reduce exhaust emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If fuel injection timing is optimized to reduce PM and NOx emissions, then combustion efficiency improves, but the system complexity increases due to real-time monitoring and adaptive control requirements
Solution Approach 1:
The patent implements a feedback control mechanism where the exhaust gas sensor continuously monitors PM and NOx levels, and the ECU adjusts fuel injection timing based on these readings. This closed-loop feedback system enables adaptive optimization of emissions without requiring complex manual intervention or overly sophisticated control algorithms.
Solution Approach 2:
The system performs self-diagnosis and self-adjustment by using the exhaust gas sensor data to automatically modify injection timing. The ECU independently processes sensor signals and adjusts injection parameters without external intervention, reducing the need for additional complex control systems while maintaining emission optimization.
2Measurement precision
If real-time exhaust gas monitoring is implemented, then emission control accuracy improves, but the device complexity and cost increase
Solution Approach 1:
The exhaust gas sensor serves multiple functions: it detects both PM and NOx levels, provides feedback for injection timing adjustment, and enables the system to adapt to various operating conditions. This multi-functionality reduces the need for separate specialized sensors and control mechanisms, thereby limiting the increase in device complexity while maintaining measurement precision.
3Power
If fuel injection timing is advanced to improve combustion efficiency, then power output increases, but harmful emissions may increase
Solution Approach 1:
The patent employs dynamic adjustment of fuel injection timing based on real-time exhaust gas composition and engine operating conditions. Rather than using fixed advanced timing, the ECU continuously modifies injection timing to optimize the balance between power output and emission control, allowing the system to adaptively respond to changing conditions.
Solution Approach 2:
The system changes the injection timing parameter dynamically based on feedback from the exhaust gas sensor. By adjusting this critical parameter in response to detected PM and NOx levels, the system maintains optimal combustion efficiency and power output while preventing excessive emissions, resolving the contradiction between power and emission control.
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 configuration reduces the amount of PM and NOx in exhaust gas by optimizing fuel injection timing based on real-time engine conditions, improving combustion efficiency and maintaining emissions within acceptable ranges.
Implementation Method 1
an exhaust gas sensor to detect a component in exhaust gas from the internal combustion engine
Implementation Method 2
a fuel injection valve for direct injection to directly inject high-pressure fuel in the pressure accumulator into a combustion chamber
Data Source
AI summary
A timing setting section sets a fuel injection timing in a second half of a compression stroke of an internal combustion engine, at a predetermined computation timing, which is set for each combustion cycle of the internal combustion engine, when an amount of a reduction target component in exhaust gas detected by an exhaust gas sensor is greater than or equal to a predetermined value, on condition that the internal combustion engine satisfies a predetermined high temperature condition. The fuel injection control device further includes an injection control unit to compute a fuel injection period based on the injection timing set by the timing set unit and to control the fuel injection valve based on the injection timing and the injection period.