Fuel Injection Valve Sampling Timing for Singular Point Detection
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Solution Overview
Problem
Current fuel injection control systems struggle to accurately detect the injection characteristics of fuel injection valves due to limitations in time resolution and synchronization of A/D conversion, leading to variations in fuel injection quantities among valves.
Innovation Solution
A fuel injection control device that includes an input part for physical quantity data, an A/D conversion part with variable conversion timing, and a detection part that uses time series data from multiple conversion timings to improve detection accuracy of singular points in fuel injection valve characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If A/D conversion is performed at constant time intervals synchronized with peripheral clock, then the system operation is stable and simple, but the detection accuracy of singular points cannot exceed the fixed time resolution
Solution Approach 1:
The patent applies dynamics by making the A/D conversion timing variable rather than fixed. The control device dynamically adjusts the conversion timing based on the injection pulse timing for each fuel injection valve, allowing the sampling moments to adapt to different injection events. This dynamic timing adjustment enables accurate detection of singular points while maintaining system simplicity through automated control.
Solution Approach 2:
The patent changes the timing parameter of A/D conversion from a fixed constant interval to a variable interval synchronized with injection pulse timing. By modifying this critical parameter, the system achieves higher detection accuracy for singular points without requiring complex additional hardware, as the timing variation is controlled through software-based injection timing information.
2Measurement precision
If A/D conversion timing is synchronized with fuel injection valve driving timing, then the detection is simplified, but accurate detection of singular points becomes difficult due to fixed sampling moments
Solution Approach 1:
The patent implements feedback by using the injection pulse timing information (which reflects the actual operating state of each fuel injection valve) to determine the A/D conversion timing. This feedback mechanism ensures that sampling occurs at optimal moments for detecting singular points while automatically adapting to variations in injection timing, thereby maintaining both ease of operation and high detection accuracy.
Solution Approach 2:
The patent applies preliminary action by pre-synchronizing the A/D conversion timing with the injection pulse timing before the actual injection event occurs. The control device prepares the conversion timing based on anticipated injection events, ensuring that singular points are captured at the correct moments without requiring complex real-time adjustment during the injection process itself.
3Productivity
If multi-stage injection is used to reduce fuel injection quantity per cycle, then fuel consumption and output are improved, but the ratio of variation amount to injection quantity increases causing greater deviation from target quantity
Solution Approach 1:
The patent replaces mechanical adjustment methods with electronic control and detection. Instead of physically adjusting injection valve characteristics to compensate for variations, the system uses electronic A/D conversion with optimized timing to detect actual injection characteristics, then electronically adjusts subsequent injection pulses. This substitution enables precise control of multi-stage injection quantities while maintaining fuel efficiency.
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 solution enhances the detection accuracy of fuel injection valve characteristics beyond the original time resolution of A/D conversion, effectively reducing instrumental variations among fuel injection valves.
Implementation Method 1
a valve element of each fuel injection valve changes based on a spring characteristic, a solenoid characteristic
Implementation Method 2
a valve element of each fuel injection valve changes based on a spring characteristic
Data Source
AI summary
Provided is a fuel injection control device capable of improving detection accuracy of a singular point with respect to a characteristic of the fuel injection valve to be equal to or higher than an original time resolution of the A/D conversion, and capable of accurately detecting the singular point. A variable control part 24 variably controls a conversion timing of the A/D conversion part 221 such that the conversion timing of A/D conversion for physical quantity data related to driving of the fuel injection valve 10 is relatively changed, the A/D conversion part 221 acquires a plurality of time series data by performing A/D conversion on the physical quantity data at a conversion timing before change and at a conversion timing after change by the variable control part 24, and a detection part 223 detects a singular point with respect to the characteristic of the fuel injection valve 10 based on the plurality of time series data.