Fuel Injector Drift Compensation Using Rail Pressure Sensing
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Solution Overview
Problem
Fuel injectors in internal combustion engines experience drift over time, affecting performance, durability, and emissions due to factors like coking and wear, which existing systems struggle to accurately detect and compensate for without increasing cost and complexity.
Innovation Solution
A fuel injection system with a sensor coupled to a primary fuel injector senses pressure throughout each cycle, allowing a controller to determine a fuel quantity drift parameter and adjust the fuel quantity delivered by both primary and secondary injectors, compensating for drift by adjusting energization periods and injection timings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is provided on each fuel injector to detect fuel pressure, then measurement precision of fuel quantity drift is improved, but device complexity and cost increase
Solution Approach 1:
A single sensor on one fuel injector serves multiple purposes: it detects fuel pressure for that injector and simultaneously provides drift compensation data for all other injectors in the system, eliminating the need for individual sensors on each injector
Solution Approach 2:
The system uses the fuel pressure data from one sensor as a representative model or copy of the fuel delivery characteristics across all injectors, assuming similar drift behavior and applying the measured drift parameter universally
2Reliability
If fuel quantity drift is not compensated, then device complexity remains low, but engine performance and emissions deteriorate over time
Solution Approach 1:
The system continuously monitors fuel pressure through the sensor, calculates drift parameters from the measured data, and applies real-time compensation adjustments to fuel injection quantities, creating a closed-loop feedback system that maintains performance over time
Solution Approach 2:
The controller dynamically adjusts fuel injection parameters (quantity, timing, or duration) based on calculated drift parameters, changing operational parameters to compensate for injector degradation and maintain desired engine characteristics
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
The system effectively compensates for long-term injector drift, improving engine performance, durability, and emissions by using a single sensor to manage fuel quantity across all injectors, reducing the need for individual sensors on each injector and maintaining desired engine characteristics.
Implementation Method 1
the sensor is configured to sense a fuel pressure of the fuel being injected by the primary fuel injector throughout each injection cycle of the primary fuel injector
Data Source
AI summary
A fuel injection system for an internal combustion engine is provided. The fuel injection system comprises a primary fuel injector, a sensor, at least one secondary fuel injector and a controller. The primary fuel injector is configured to inject fuel into an ignition chamber of the internal combustion engine. The sensor is coupled to the primary fuel injector, wherein the sensor is configured to sense a fuel pressure of the fuel being injected by the primary fuel injector throughout each injection cycle of the primary fuel injector. The at least one secondary fuel injector is configured to inject fuel into a respective ignition chamber of the internal combustion engine. The controller is configured to receive data indicative of the fuel pressure value throughout each injection cycle. The controller is configured to determine a fuel quantity drift parameter over a plurality of fuel injection cycles based on the data indicative of the fuel pressure value. The controller is configured to adjust a fuel quantity delivered by the primary fuel injector and each secondary fuel injector based on the fuel quantity drift parameter.