Fuel Injection Learning Apparatus Temperature Compensation
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Solution Overview
Problem
Existing fuel injection systems fail to accurately control fuel injection conditions due to variations in fuel temperature, leading to inaccurate fuel injection characteristics and reduced control precision.
Innovation Solution
A fuel-injection-characteristics learning apparatus that includes a fuel pressure sensor, a fuel temperature sensor, and a learning portion to store fuel-injection-characteristic values in association with temperature, enabling the generation of fuel-injection command signals based on actual temperature conditions, thereby controlling fuel injection with high accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fuel-injection-characteristic values are learned without considering fuel temperature, then the learning process is simpler and faster, but the fuel injection condition cannot be controlled with high accuracy
Solution Approach 1:
The patent applies parameter changes by storing fuel-injection-characteristic values in association with fuel temperature. The learning portion stores characteristic values (such as injection start time delay, injection end time delay, and injection rate characteristics) corresponding to different fuel temperature ranges. This allows the system to select appropriate characteristic values based on actual fuel temperature, thereby maintaining high injection control accuracy without overcomplicating the learning process.
2Device complexity
If fuel-injection-characteristic values are stored without temperature association, then the memory structure is simpler, but the fuel injection condition control accuracy deteriorates
Solution Approach 1:
The memory portion is designed to store fuel-injection-characteristic values in association with fuel temperature parameters. The learning portion organizes characteristic values according to temperature ranges, creating a structured memory system that balances complexity and accuracy. This temperature-based organization allows efficient retrieval of appropriate characteristic values while maintaining reasonable memory structure complexity.
3Measurement precision
If temperature-dependent fuel-injection-characteristic values are implemented, then fuel injection control accuracy improves, but the system complexity increases
Solution Approach 1:
The system implements temperature-dependent fuel-injection-characteristic values by introducing fuel temperature sensing and temperature-based value selection. The learning portion detects fuel temperature and selects appropriate characteristic values from stored data organized by temperature ranges. This approach improves injection control accuracy while limiting system complexity through efficient data organization and selection logic.
Solution Approach 2:
The system incorporates feedback through the fuel temperature sensor that continuously monitors fuel temperature and provides this information to the learning portion. Based on the detected temperature, the system selects appropriate fuel-injection-characteristic values and adjusts injection timing and duration accordingly. This closed-loop feedback mechanism ensures accurate injection control adapted to varying thermal conditions.
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 apparatus ensures precise control of fuel injection conditions by associating fuel-injection-characteristic values with temperature, improving accuracy and reliability of fuel injection timing, rate, and quantity, even after the fuel injector has aged.
Implementation Method 1
a fuel pressure sensor provided in a fuel passage fluidly connecting the accumulator and the fuel injection port to detect a fuel pressure in the fuel passage
Implementation Method 2
a fuel temperature sensor provided in the fuel passage to detect a fuel temperature in the fuel passage
Implementation Method 3
a characteristic-value detecting portion which analyzes a fuel injection condition based on a fuel pressure waveform which represents a variation in a detection value of the fuel pressure sensor
Data Source
AI summary
A characteristics-detecting-portion analyzes a fuel injection condition based on a fuel pressure waveform which represents a variation in a detection value of the fuel pressure sensor and then detects the fuel-injection-characteristic value based on the analyzed fuel injection condition. The detected parameter is learned and stored in a memory in association with a fuel temperature detected by a fuel temperature sensor. A fuel-injection-rate model is established based on the learned detected parameters. A command-fuel-injection start time and a command-fuel-injection period are defined by use of the fuel-injection-rate model and the current fuel temperature.