Fuel Injection Valve Detector Timing Deviation Correction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The accuracy of detecting whether a fuel injection valve is opened or closed is compromised due to peak deviations caused by noise removal in voltage waveforms using low-pass filters.

Innovation Solution

A detector system that includes a filtering unit, a detection unit, a correction unit, and a detecting unit, which performs filtering processes on voltage waveforms, detects peak values, corrects timing deviations based on differences between peak values, and accurately determines the opening or closing of the fuel injection valve using a finite impulse response filter.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a low-pass filter is applied to remove noise from the voltage waveform, then noise removal is improved, but the differential waveform becomes blunt and peak timing accuracy deteriorates

Engineering Contradiction:

ImprovenoiseVSAvoidpeak timing accuracy

Core Design Contradiction:

Object-affected harmful factorsVSMeasurement precision

Solution Approach 1:

The patent applies a low-pass filter in advance to remove noise from the voltage waveform before differentiation. By preprocessing the signal to eliminate noise components, the subsequent differentiation produces a cleaner differential waveform with more accurate peak timing, resolving the contradiction between noise removal and measurement precision

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces an intermediate processing step where the voltage waveform is first differentiated to obtain a differential waveform, and then a low-pass filter is applied to this differential waveform rather than the original voltage waveform. This intermediary approach allows noise removal while preserving the sharp peak characteristics needed for accurate timing detection

Inventive Principle:

Principle #24Intermediary (Mediator)

2Speed

If the differential waveform is used to detect valve timing, then detection speed is improved, but noise in the waveform reduces measurement precision

Engineering Contradiction:

Improvedetection speedVSAvoidtiming detection precision

Core Design Contradiction:

SpeedVSMeasurement precision

Solution Approach 1:

The patent uses the differential waveform as an intermediary representation that captures the essential timing information while separating it from noise. By applying low-pass filtering specifically to the differential waveform, the system maintains detection speed while improving precision through selective noise removal from the already-differentiated signal

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11280286B2Detector

Publication Date: 2022.03.22 ASTEMO LTD

AI summary

This detector includes: a filtering unit performing a first filtering process of performing a filtering process on a first waveform or a second filtering process of performing a filtering process on a second waveform; a detection unit detecting a timing of a first peak value corresponding to a predetermined peak value of a third waveform; a correction unit which corrects a deviation of a detection value corresponding to a timing detected by the detection unit with respect to a timing when the fuel injection valve is actually opened or closed based on a difference between the first peak value of the third waveform and a second peak value of the third waveform appearing after the first peak value; and a detecting unit which detects one or both of the opening and closing of the fuel injection valve based on the detection value corrected by the correction unit.