Fuel Injection Controller Throttle Timing Correction
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Solution Overview
Problem
Existing fuel injection controllers for internal combustion engines face challenges in accurately determining the ideal fuel injection amount due to redundant variations in throttle opening and intake pressure, leading to complexity and increased experimental man-hours.
Innovation Solution
A fuel injection controller that calculates a basic fuel injection amount based on engine rotary speed and intake pipe internal pressure, with corrections made using specific throttle openings (TH0 and TH1) to minimize the impact of intake pressure changes, allowing for a close-to-ideal correction and reducing the need for multiple maps and memory storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the basic injection amount is corrected based on the difference between map-searched values of intake pressure (PBmap1 - PBmap0), then the correction accounts for intake pressure changes, but the throttle opening changes during the intake stroke cause redundant variations that deviate the correction from ideal
Solution Approach 1:
The patent applies preliminary action by using the throttle opening TH0 at a predetermined timing (before the intake stroke) to predict the intake pressure variation in advance. This allows the correction amount to be calculated based on a throttle opening that reflects the intake pressure condition without the redundant variations caused by throttle changes during the intake stroke, thereby improving injection amount accuracy while simplifying the correction logic.
2Measurement precision
If multiple maps and correction factors are used to account for throttle opening variations, then the injection amount accuracy improves, but the experimental man-hours and system complexity increase
Solution Approach 1:
The patent extracts the essential factor (throttle opening at predetermined timing TH0) that influences intake pressure from the complex set of varying parameters during the intake stroke. By isolating this single predictive parameter, the system avoids the need for multiple maps and extensive experimental calibration, significantly reducing development time while maintaining accurate injection amount correction.
3Measurement precision
If the throttle opening change during the intake stroke is fully considered for correction, then the correction becomes more accurate, but the calculation requires more parameters and increases complexity
Solution Approach 1:
The patent uses the throttle opening TH0 measured at a predetermined timing before the intake stroke as a preliminary indicator of the intake pressure condition. This single parameter captures the essential information needed for correction without requiring multiple parameters or complex calculations during the intake stroke, thereby maintaining correction accuracy while minimizing system complexity.
Data Source
AI summary
In a fuel injection controller, a first throttle opening TH0 is defined at a specific time P2. The P2 is a specific time later than the peak value of an intake pipe internal pressure PB of a previous cycle. In the cycle, P3 is a specific time that is set immediately before the calculation of the injection time. A second throttle opening TH2 is defined at P3. The fuel injection controller corrects a fuel injection amount based on variation in correction time ta0 at the first throttle opening TH0 to correction time ta1 at the second throttle opening TH1. The time P2 is later than time P1, which is the peak value of the intake pipe internal pressure of the previous cycle. Accordingly, the fuel injection amount correction is completely unaffected or only slightly affected by the intake pipe internal pressure, thus ensuring close-to-ideal correction.