Fuel Injector Timing Detection via Current Sensing
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Solution Overview
Problem
Fuel injectors in internal combustion engines experience a time delay between receiving an injection signal and mechanically opening, which varies due to mechanical properties and operating factors, leading to inconsistent fuel delivery.
Innovation Solution
An engine control system that monitors the electrical current amplitude of fuel injection signals to detect mechanical openings, calculates time delays, and adjusts the duration of electrical fuel injection signals to compensate for these delays, ensuring precise fuel delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the engine control system uses fixed timing for fuel injection signals, then the control system is simple, but the fuel delivery becomes inaccurate due to varying mechanical opening delays
Solution Approach 1:
The system monitors the actual current consumption of the fuel injector and uses this feedback to detect mechanical opening events. By comparing the expected current profile with the actual current, the system calculates real-time opening delays and adjusts the injection timing accordingly, creating a closed-loop control system that adapts to variations in injector mechanics.
Solution Approach 2:
The fuel injector system uses its own current consumption characteristics to self-diagnose and self-adjust. The monitoring of current amplitude allows the system to automatically detect opening delays without external sensors or complex additional hardware, enabling the system to compensate for its own mechanical variations using intrinsic electrical signals.
2Measurement precision
If the engine control system adds current monitoring to detect injector opening, then fuel delivery precision improves, but the device complexity increases
Solution Approach 1:
The system uses the injector's own current consumption as the monitoring signal, eliminating the need for separate mechanical position sensors. The current amplitude variations during injector operation provide direct information about mechanical opening events, allowing the system to self-monitor and self-adjust without adding external sensing hardware.
Solution Approach 2:
The patent replaces potential mechanical position sensors with electrical current monitoring. Instead of mechanically detecting injector opening through physical sensors, the system uses electrical current amplitude variations to infer mechanical opening events, substituting a mechanical detection approach with an electrical measurement approach.
3Manufacturing precision
If the engine control system compensates for time delay variations, then fuel delivery accuracy improves, but the calculation and adjustment complexity increases
Solution Approach 1:
The system continuously monitors current consumption during injector operation to detect opening events in real-time. By identifying the actual opening moment through current analysis, the system can calculate the time delay between the electrical signal and mechanical opening, and use this information to adjust subsequent injection timing parameters proactively.
Solution Approach 2:
The injection timing control transitions from a fixed, static parameter to a dynamic, adaptive parameter. The system continuously adjusts the injection timing based on real-time current monitoring data, allowing the control parameters to change dynamically in response to actual injector performance variations rather than relying on predetermined fixed values.
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 approach allows for accurate delivery of fuel quantities, improving fuel economy and reducing emissions by accounting for variations in injector mechanics and operating conditions.
Implementation Method 1
Fuel injectors for internal combustion engines operate according to electrical signals from an engine control system. When a fuel injector receives an injection signal, there is a time delay before the injector opens to allow fuel to pass.
Implementation Method 2
the engine control system may detect the mechanical opening of a fuel injector following the sending of an injection signal to the fuel injector by monitoring an electrical current of the injector signal
Data Source
AI summary
A fuel injection system for an internal combustion engine includes a fuel injector and an engine control system. The engine control system is configured to send electrical fuel injection signals to the fuel injector to open the fuel injector, monitor a current amplitude of electrical fuel injection signals, detect the mechanical openings of the fuel injector based on the monitored current amplitudes of electrical fuel injection signals according to inflection points between a decreasing slope and an increasing slope in the monitored current amplitudes of electrical fuel injection signals, calculate time delays between the sent electrical fuel injection signals and the mechanical openings of the fuel injector, and set durations of electrical fuel injection signals based on the calculated time delays.