Electronic Fuel Injection for Precise Octane Rating Control

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Solution Overview

Problem

The conventional ASTM D2699 and ASTM D2700 octane number determination methods for spark-ignition engine fuel lack precision and accuracy due to manual fuel level adjustments and qualitative measurements, which hinder the correlation of octane number with standardized engine parameters like air-fuel ratio, leading to inconsistencies across testing facilities.

Innovation Solution

An electronic fuel injection system with high-pressure pumps, electronic fuel injectors, and air-fuel ratio sensors is introduced to enable precise control of fuel flow rate, injection duration, and air-fuel ratio, allowing for direct measurement and compensation for oxygenated fuels and environmental changes, thereby improving the accuracy and repeatability of octane number determination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If manual fuel level adjustments and qualitative measurements are used in conventional ASTM D2699 and ASTM D2700 methods, then the testing process is simpler to operate, but the precision and accuracy of octane number determination deteriorates

Engineering Contradiction:

Improveoctane number determination accuracyVSAvoidelectronic fuel injection system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces the manual mechanical fuel adjustment system with an electronic fuel injection system. The electronic fuel injector precisely controls fuel delivery through electronic signals, eliminating manual intervention and providing accurate, repeatable fuel metering. This substitution directly improves measurement precision while the electronic control system manages the added complexity through automated operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The electronic fuel injection system incorporates self-regulating capabilities through electronic control. The system automatically adjusts fuel delivery based on sensor feedback and pre-programmed parameters, eliminating the need for manual adjustments and qualitative assessments. This self-service approach ensures consistent, high-precision measurements without requiring operator intervention.

Inventive Principle:

Principle #25Self-service

2Reliability

If electronic fuel injection system is implemented, then the precision and accuracy of octane number testing is improved, but the device complexity increases

Engineering Contradiction:

Improverepeatability of octane number determinationVSAvoidelectronic control system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The electronic fuel injection system incorporates feedback mechanisms through sensors that monitor fuel delivery, air-fuel ratio, and engine parameters. This feedback loop enables the control system to automatically adjust and maintain optimal operating conditions, ensuring high repeatability and reliability of octane number determination. The feedback system manages complexity by using standardized electronic control protocols.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system precisely controls and varies fuel injection parameters (duration, quantity, timing) electronically to achieve different air-fuel ratios required for octane testing. This electronic parameter control provides repeatable, accurate results while managing system complexity through programmable control logic that automates the testing sequence and data collection.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If electronic control of fuel flow rate and air-fuel ratio is used, then the correlation with standardized engine parameters is improved, but the ease of operation deteriorates

Engineering Contradiction:

Improvecorrelation of octane number with air-fuel ratioVSAvoidoperation complexity of electronic fuel injection system

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent replaces manual mechanical fuel metering with electronic fuel injection controlled by a microprocessor. This substitution enables precise control of fuel flow rate and air-fuel ratio through electronic signals, achieving accurate correlation with standardized engine parameters. The electronic control system manages operational complexity through automated sequencing and pre-programmed testing procedures.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The electronic control system acts as an intermediary between the operator and the complex fuel injection system. It translates simple operator commands into precise electronic control signals that manage fuel delivery, sensor data collection, and test sequencing. This intermediary layer shields the operator from system complexity while maintaining precise control over fuel parameters for accurate octane determination.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20260002486A1Systems and methods for octane number rating with electronic fuel injection

Publication Date: 2026.01.01 CFR ENGINES INC

AI summary

An electronic fuel injection system for an octane number rating system includes an electronic fuel pump, an electronic fuel injector in fluid communication with an outlet of the electronic fuel pump, and an air-fuel ratio sensor configured to measure an air-fuel ratio within or downstream of an exhaust port. The electronic fuel pump is configured to supply pressurized fuel from a carburetor bowl to the electronic fuel injector, and the electronic fuel injector is coupled to the intake pipe upstream of the venturi.