Fuel Injection Valve Signal Sampling 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 in internal combustion engines due to limitations in time resolution and synchronization of A/D conversion, leading to variations in fuel injection quantities.
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 multiple time series data to improve detection accuracy by adjusting the input and conversion timing, allowing for precise detection 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 constant value to a variable value that depends on injection pulse timing. By modifying the conversion timing parameter adaptively for each fuel injection valve based on its specific injection characteristics, the system achieves higher detection accuracy without requiring complex additional hardware.
2Measurement precision
If A/D conversion timing is fixed for all fuel injection valves, then the control system is simple, but instrumental variations among individual valves cannot be accurately detected
Solution Approach 1:
The patent applies preliminary action by pre-storing the injection pulse timing information for each fuel injection valve in memory before the detection process. This preliminary storage of timing data allows the A/D conversion to be synchronized with each valve's specific injection characteristics without requiring complex real-time calculations, thereby maintaining ease of operation while achieving high detection accuracy.
Solution Approach 2:
The system uses feedback by utilizing the injection pulse timing information (which reflects the actual operating characteristics of each fuel injection valve) to determine the optimal A/D conversion timing. This feedback mechanism ensures that the conversion timing is automatically adapted to each valve's individual characteristics, accurately detecting instrumental variations while keeping the control system straightforward.
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
Solution Approach 1:
The patent replaces mechanical adjustment methods with an electronic control approach. Instead of physically adjusting injection valve characteristics to reduce injection quantity, the system uses electronically controlled A/D conversion timing synchronized with injection pulses to detect and compensate for variations. This substitution enables precise measurement and control of injection quantities even at low levels used in multi-stage injection.
Solution Approach 2:
The system implements feedback by using detected injection characteristics (from synchronized A/D conversion) to adjust injection pulse timing for each fuel injection valve. This feedback loop compensates for instrumental variations among individual valves, ensuring consistent fuel injection quantities across all valves even when operating in multi-stage injection mode with reduced per-cycle quantities.
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 and ensuring more precise control over fuel injection quantities.
Implementation Method 1
an A/D conversion part that performs A/D conversion on the physical quantity data at a conversion timing having a predetermined time interval to acquire time series data
Implementation Method 2
a detection part that detects a singular point with respect to a characteristic of the fuel injection valve from the time series data
Data Source
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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.