Fuel Injection Controller Sensor Averaging
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Solution Overview
Problem
Conventional fuel injection systems lack robustness in controlling fuel pressure due to manufacturing and design errors in fuel pressure sensors, leading to deviations in actual pressure values, which affects accurate fuel injection.
Innovation Solution
A controller system that includes fuel pressure sensors for each injector, an output acquiring means, an average computing means, and an output value correction means to normalize sensor outputs, improving robustness and accuracy by averaging and correcting sensor data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single fuel pressure sensor is used in conventional systems, then the system structure is simple, but the measurement precision deteriorates due to manufacturing and designing errors causing deviation from actual pressure values
Solution Approach 1:
The patent divides the single sensor measurement function into multiple sensors (first and second fuel pressure sensors) positioned at different locations in the fuel passage. Each sensor independently measures pressure, and their outputs are averaged to obtain a more accurate representation of actual fuel pressure, thereby resolving the measurement precision issue while maintaining manageable system complexity through modular sensor placement
Solution Approach 2:
The patent combines the measurements from multiple fuel pressure sensors by computing an average of their output values. This merging of data sources compensates for individual sensor deviations caused by manufacturing and designing errors, improving overall measurement precision without requiring complex calibration systems
2Reliability
If multiple fuel pressure sensors are deployed, then the measurement precision improves by reducing deviation from actual pressure, but the device complexity increases
Solution Approach 1:
The controller continuously monitors the output values from multiple fuel pressure sensors, computes their average, and uses this feedback to correct control decisions. This feedback mechanism improves reliability by compensating for sensor deviations in real-time, while the automated computation keeps the complexity management straightforward
Solution Approach 2:
The patent changes the measurement parameters by using multiple sensors at different positions and averaging their outputs rather than relying on a single sensor reading. This parameter change approach enhances reliability by reducing the impact of individual sensor errors while maintaining simple averaging computation
Data Source
AI summary
A fuel pressure sensor is provided to each fuel injector respectively and is disposed in a fuel passage between the accumulator and a fuel injection port of the fuel injector in such a manner as to be close to a fuel injection port relative to the accumulator. Output values of a plurality of fuel pressure sensors are acquired, and an average of the output values is computed. The output values are corrected in such a manner as to agree with the average.