Fuel Injector Control Device Valve Profile Estimation
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Solution Overview
Problem
Current control devices for fuel injectors cannot accurately control fuel injection quantity due to incomplete detection of valve-opening and valve-closing profiles, leading to precision issues in fuel injection.
Innovation Solution
A control device that includes a full-lifting valve-closing response acquisition unit to obtain the valve-closing profile and a valve-opening response estimation unit to estimate the valve-opening profile, allowing for precise control of fuel injection quantity by analyzing electric signal behaviors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only valve-closing position detection is implemented, then valve-closing profile can be obtained, but valve-opening profile cannot be obtained
Solution Approach 1:
The patent applies inversion by detecting the valve-closing profile (which is easier to detect with existing technology) and then estimating the valve-opening profile by reversing the temporal sequence. The valve-opening profile is obtained by time-reversing the valve-closing profile, thus deriving information about valve-opening behavior from valve-closing detection data.
Solution Approach 2:
The patent creates a copy of the valve-closing profile through time-reversal to generate the valve-opening profile. Instead of directly detecting the valve-opening profile, the system copies the closing profile data and transforms it temporally to represent opening behavior, which is then used for injection quantity control.
2Measurement precision
If valve-opening timing detection is implemented, then valve-opening completion timing can be detected, but valve-opening start timing cannot be detected
Solution Approach 1:
The patent uses time-reversal inversion to detect valve-opening start timing. By reversing the valve-closing profile temporally, the end of the closing profile corresponds to the start of the opening profile, thus deriving start timing information that would be difficult to obtain through direct detection methods.
3Manufacturing precision
If injection quantity control is improved by detecting valve profiles, then fuel injection precision is improved, but device complexity increases
Solution Approach 1:
The patent reduces device complexity by using a copying approach rather than implementing separate detection systems for valve-opening and valve-closing profiles. A single detection system captures the valve-closing profile, which is then copied and time-reversed to generate the valve-opening profile, eliminating the need for additional sensors or complex dual-detection mechanisms.
Solution Approach 2:
The patent applies multi-functionality by using a single detection system to serve dual purposes: directly providing valve-closing profile data and, through time-reversal processing, providing valve-opening profile data. This universal approach allows one system to perform the work of what would traditionally require two separate systems.
Data Source
AI summary
A control device that is to output a driving signal to a fuel injector includes a full-lifting valve-closing response acquisition unit to acquire a full-lifting valve-closing profile indicating a valve-closing behavior of the fuel injector from a full-lifting state of a valve body constituting the fuel injector, based on a behavior of an electric signal from the full-lifting state to a closing state of the valve body, and a valve-opening response estimation unit to estimate a valve-opening profile indicating a valve-opening behavior when a valve-opening driving signal is input to the fuel injector, based on at least the full-lifting valve-closing profile.