Fuel Injection Valve Drive Timing from Solenoid Current Arrival
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Solution Overview
Problem
The timing of the inflection point of a drive current may not align with the valve opening start time in electromagnetic valve drive devices, making it difficult to determine the exact start time of valve opening.
Innovation Solution
An electromagnetic valve drive device that includes a processing unit to measure the current value arrival time and an estimation unit to calculate the valve opening start time, which can correct for temperature variations and ensure a consistent valve opening time by adjusting the energization control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the electromagnetic valve drive device uses the inflection point of drive current to determine valve opening start time, then the measurement is simple, but the measurement precision deteriorates when the inflection point does not align with the actual valve opening start time
Solution Approach 1:
The patent introduces an intermediary calculation process that uses the inflection point time as a reference and adds a corrected time difference to obtain the accurate valve opening start time. This mediator approach allows the system to use the simple inflection point detection while achieving precise valve opening timing measurement through the relationship: valve opening start time = inflection point time + time difference correction
Solution Approach 2:
The patent replaces the direct mechanical/electrical correlation method (using inflection point as direct indicator) with an electrical measurement and calculation system. By measuring electrical parameters (current, voltage, impedance) and calculating the time difference through electrical characteristics, the system achieves accurate valve opening timing without relying on the inflection point alignment
2Ease of operation
If the electromagnetic valve drive device measures drive current to determine valve opening timing, then the control is straightforward, but the reliability deteriorates when valve structure variations cause inflection point misalignment
Solution Approach 1:
The patent implements a feedback mechanism where the system measures the actual time difference between the inflection point and the valve opening start time, then uses this feedback to correct subsequent measurements. By continuously monitoring and adjusting based on the measured time difference, the system maintains reliable valve opening timing detection despite variations in valve structure or operating conditions
Solution Approach 2:
The patent changes the measurement parameter from directly detecting the inflection point as the valve opening indicator to measuring the time difference between the inflection point and actual valve opening. This parameter change allows the system to account for structural variations by measuring and compensating for the time offset, thereby maintaining reliability across different valve configurations
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
Enables accurate determination of the valve opening start time even when the inflection point occurs after the start, maintaining a constant valve opening time and reducing variations in fuel injection amounts.
Implementation Method 1
a solenoid coil 4 and a drive device 1 for driving the fuel injection valve L. Specifically, the drive device 1 drives the fuel injection valve L operated by the solenoid coil 4
Data Source
AI summary
An electromagnetic valve drive device, that drives a fuel injection valve having a solenoid coil, includes a drive unit configured to drive the solenoid coil, an energization control unit configured to control energization for the solenoid coil by controlling the drive unit, a processing unit configured to obtain a current value arrival time, which is a time having elapsed from a start of energization for the solenoid coil until a current flowing through the solenoid coil reaches a predetermined current value, and an estimation unit configured to estimate a valve opening start time, which is a time from the start of the energization to a start of opening of the fuel injection valve on the basis of the current value arrival time.