Fuel Injection Controller Temperature Correction Logic
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Solution Overview
Problem
Conventional fuel injection controllers face challenges in accurately controlling fuel injection amounts due to temperature-related changes in the characteristic line between energization time period and injection amount, leading to incorrect correction inversions and inaccurate fuel injection.
Innovation Solution
A fuel injection controller that sets the target injection amount to deviate from the peak appearance range or cross-point appearance range, allowing for accurate determination of correction type based on coil temperature, eliminating the need for frequent correction changes and ensuring precise fuel injection control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature correction is applied based on coil temperature, then fuel injection accuracy is improved, but incorrect determination of correction type (increase/decrease area) causes injection amount errors
Solution Approach 1:
The patent introduces a peak appearance range as an intermediary reference frame. Instead of directly determining whether to increase or decrease correction based on temperature alone, the system uses the peak appearance range (derived from coil current characteristics) as a mediator to establish the correction type. This intermediary reference prevents direct errors in determination by providing an objective benchmark that accounts for actual coil behavior at different temperatures.
Solution Approach 2:
The patent implements feedback by using the actual coil current characteristics (peak appearance timing) to determine the correction type. Rather than relying solely on predetermined temperature thresholds, the system continuously monitors coil current and adjusts the correction determination based on actual measured characteristics. This feedback mechanism ensures that the correction type (increase or decrease area) is determined accurately according to real-time coil behavior.
2Device complexity
If the characteristic line is assumed to match the actual line, then calculation simplicity is improved, but deviation between assumed and actual lines causes wrong determination results
Solution Approach 1:
The patent dynamically changes the parameter used for determination from a static assumed characteristic line to a dynamic actual characteristic line derived from coil current measurements. By using the peak appearance timing from actual coil current as the determination basis, the system adapts to real coil behavior at different temperatures. This parameter change allows the system to maintain determination accuracy without requiring complex predetermined characteristic lines for every possible temperature condition.
3Reliability
If correction inversion is implemented based on temperature area determination, then temperature-related injection variations are compensated, but frequent correction type changes increase control complexity
Solution Approach 1:
The patent performs preliminary determination of the correction type (increase or decrease area) based on peak appearance timing before applying temperature correction. By establishing the correction type in advance using objective coil current characteristics, the system avoids frequent switching and complex real-time decision-making during correction application. This preliminary action simplifies the control logic by pre-establishing the correction approach based on measurable coil behavior.
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 approach enables higher accuracy in fuel injection control by determining whether to increase or decrease the energization time period correction based on coil temperature, preventing incorrect inversions and ensuring consistent target injection amounts.
Implementation Method 1
a fuel injector adapted to perform a valve-opening operation of a valve body through electromagnetic attraction force generated by energization of a coil
Implementation Method 2
a booster circuit adapted to boost a battery voltage
Implementation Method 3
As the coil temperature gets higher, the electric resistance gets higher
Data Source
AI summary
A fuel injection controller includes an energization time period calculation portion adapted to calculate an energization time period of a coil responsive to a target injection amount; and a rise control portion adapted to apply a boosted voltage to the coil, along with start of the energization time period, and to raise an current flowing through the coil to a predetermined threshold value. When a range where timing of the current raised to have a peak value at the threshold value appears in accordance with a range of an operating temperature of the coil is defined as a peak appearance range W1, the target injection amount is set such that timing of completion of the energization time period Ti is timing deviated from the peak appearance range W1.