Fuel Injection Valve Control Device Needle Travel Speed Optimization
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Solution Overview
Problem
Existing fuel injection valve control devices are limited in improving fuel efficiency and reducing particulate matter production due to narrow timing adjustments and low robustness in fuel spray variations between engine cycles.
Innovation Solution
A fuel injection valve control device that adjusts the travel speed of the needle based on the crank angle of the internal combustion engine by setting a current waveform to control the fuel injection timing, reducing fuel adhesion to the combustion chamber walls and optimizing spray arrival distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If only injection timing is changed based on particulate matter detection, then fuel efficiency can be improved within a narrow range, but the fuel efficiency improvement is insufficient and particulate matter production increases due to fuel spray variation
Solution Approach 1:
The patent changes multiple parameters including injection timing, needle travel speed, and current waveform characteristics to optimize fuel injection. By adjusting the needle travel speed parameter independently from timing, the system achieves broader optimization range for fuel efficiency while maintaining stability against spray variations.
Solution Approach 2:
The patent introduces dynamic control of needle travel speed that varies during the injection process. The needle acceleration and velocity profiles are dynamically adjusted to ensure consistent fuel spray characteristics, improving robustness against variations while enabling greater fuel efficiency improvements.
2Loss of energy
If injection timing is advanced to improve fuel efficiency, then fuel efficiency improves, but fuel may collide with combustion chamber walls increasing particulate matter
Solution Approach 1:
The patent adjusts multiple parameters including needle acceleration, peak speed, and injection duration to control fuel spray trajectory. By optimizing these parameters, the system allows advanced injection timing for fuel efficiency while preventing fuel wall collision through controlled spray patterns.
Solution Approach 2:
The patent creates different velocity profiles at different stages of needle travel. The needle acceleration phase, peak velocity phase, and deceleration phase are independently controlled to optimize fuel atomization and spray direction, ensuring fuel enters the combustion zone without striking chamber walls.
3Loss of time
If needle travel speed is increased to advance injection timing, then injection timing advances, but the range of timing adjustment is limited and fuel spray variation increases
Solution Approach 1:
The patent employs dynamic control of needle motion with independently adjustable acceleration, peak velocity, and deceleration phases. This dynamic approach allows broad timing adjustment range while maintaining consistent fuel spray characteristics through optimized velocity profiles.
Solution Approach 2:
The patent applies preliminary current to the drive coil before needle movement begins, pre-magnetizing the coil to reduce inductance effects and enable more precise control of needle acceleration. This preliminary action expands the achievable timing range while maintaining spray consistency.
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 device enhances fuel efficiency and reduces particulate matter production by optimizing fuel injection timing and spray arrival distance, minimizing fuel collision with engine walls and improving combustion efficiency.
Implementation Method 1
a drive portion that drives the needle so that the needle and the valve seat are separated from each other when a current is supplied to the drive portion
Data Source
AI summary
A fuel injection valve control device controlling a fuel injection valve that injects a fuel into a combustion chamber includes an operation-condition calculation portion that calculates a fuel injection condition of the fuel injection valve based on a crank angle detected by a crank angle sensor that detects the crank angle of an engine, a current-waveform setting portion that sets a current waveform of a current supplied to the fuel injection valve on the basis of the fuel injection condition calculated by the operation-condition calculation portion, and so on. The current-waveform setting portion sets the current waveform so as to set a temporal change of a pickup current of a needle provided in the fuel injection valve to be equal to or less than a predetermined reference value when a fuel injection start timing is equal to or more than 180 degrees BTDC. The current-waveform setting portion sets the current waveform so as to set a temporal change of the pickup current of the needle to be more than the predetermined reference value when the fuel injection start timing is smaller than 180 degrees BTDC.