Fuel Injection Control Device Voltage Abnormality Detection
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Solution Overview
Problem
Existing fuel injection control systems face challenges in accurately detecting abnormalities in voltage information, leading to discrepancies between target and actual injection amounts, which can result in poor fuel consumption and exhaust performance due to individual differences in fuel injection valves and potential circuit failures.
Innovation Solution
A fuel injection control device that includes a first voltage supply unit, a second voltage supply unit, a fuel injection control unit, a voltage measurement unit, a correction unit, and an abnormality detection unit to measure and correct fuel injection amounts based on voltage information and detect abnormalities, ensuring accurate valve opening and closing times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If solid difference sensing is performed based on electrical characteristic, then individual difference detection capability is improved, but measurement accuracy deteriorates due to disturbances from circuit failures and valve behavior changes
Solution Approach 1:
The patent segments the sensing process into multiple phases: normal operation phase where solid difference is sensed from electrical characteristics, and abnormal operation phase where alternative sensing methods are employed. This segmentation allows the system to switch between different sensing strategies based on detected conditions, maintaining measurement accuracy while preserving individual difference detection capability.
Solution Approach 2:
The patent introduces an intermediary monitoring mechanism that detects valve behavior changes and circuit failure conditions. This intermediary system acts as a mediator between the electrical characteristic sensing and the solid difference calculation, filtering out distorted signals caused by abnormalities and preventing inaccurate measurements from corrupting the individual difference data.
2Manufacturing precision
If fuel injection amount correction is performed based on solid difference information, then injection precision is improved, but fuel consumption and exhaust performance deteriorate when abnormality detection fails
Solution Approach 1:
The patent performs preliminary abnormality detection before executing fuel injection amount correction. By detecting valve behavior changes and circuit failures in advance, the system prevents using corrupted solid difference information for correction calculations, thereby avoiding the deterioration of fuel consumption and exhaust performance while maintaining injection precision during normal operation.
Solution Approach 2:
The patent implements a feedback mechanism where the results of fuel injection correction are monitored for unexpected variations. When feedback indicates abnormal performance patterns, the system adjusts or suspends correction operations, preventing the propagation of errors from undetected abnormalities and maintaining reliable fuel consumption and exhaust performance.
3Productivity
If valve body movement control is performed in half-lift region, then dynamic flow characteristics are improved, but injection amount variation increases due to individual differences
Solution Approach 1:
The patent changes the control parameters for valve body movement based on detected solid differences. By adjusting pulse width, drive current, and timing parameters according to individual valve characteristics, the system maintains consistent injection amounts across different valves while preserving the dynamic flow characteristics achieved through half-lift control.
Solution Approach 2:
The patent applies local quality adjustment by tailoring control parameters to each individual fuel injection valve's characteristics. Instead of uniform control for all valves, the system customizes control strategies for each valve based on its specific solid difference profile, ensuring optimal performance and consistent injection amounts across the entire system.
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 allows for appropriate detection of voltage abnormalities, enabling precise correction of fuel injection amounts and preventing unintended torque variations and performance deterioration in internal combustion engines.
Implementation Method 1
a fuel injection control unit that controls the second voltage supply unit to supply the second voltage to a coil so as to open a fuel injection valve having the coil
Data Source
AI summary
Appropriate detection of an abnormality of voltage information, which is a basis for correcting a fuel injection amount, becomes possible. For this reason, a fuel injection control device 127, which has a drive IC 208 controlling a fuel injection drive unit 207a to supply a high voltage to a solenoid 405 so as to open a fuel injection valve 105 and controlling the fuel injection drive unit 207a to supply a low voltage to the solenoid 405 so as to hold a valve-open state of the fuel injection valve 105, includes: a drive voltage input unit 211 that measures and outputs voltage information based on an upstream voltage of the solenoid 405 of the fuel injection valve 105 and a downstream voltage of the solenoid 405; a fuel injection amount correction unit 213 that corrects a fuel injection amount of the fuel injection valve 105 based on the voltage information output from the drive voltage input unit 211; and a voltage input function abnormality detection unit 212 that detects whether an output of the drive voltage input unit 211 is abnormal based on the voltage information output from the drive voltage input unit 211.