Variable Interval Fuel Injection Control for Engine Load Management
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Solution Overview
Problem
Conventional fuel injection control devices for internal combustion engines face challenges in accurately reflecting changes in parameter values during multi-injection control due to constant computation intervals, leading to inappropriate fuel injection and increased processing loads, while single-injection control struggles with reflecting parameter changes without excessive processing load increases.
Innovation Solution
A fuel injection control device with a control section that samples parameter values at varying intervals and computes control values based on the latest values, switching between first and second processing modes to optimize computation and sampling intervals for single-injection and multi-injection control, ensuring timely reflection of parameter changes and managing processing loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the computation interval of the target injection amount is set as a long interval, then the processing load on the computation is reduced, but the changes of the parameter values may not be reflected to the computation of the control values on the each fuel injection
Solution Approach 1:
The patent applies dynamics by making the computation interval variable rather than constant. The control section dynamically adjusts the computation interval based on the injection mode: using a first (longer) interval for single-injection control and a second (shorter) interval for multi-injection control. This dynamic adjustment allows the system to optimize between processing load and parameter change reflection accuracy according to the specific operating conditions.
Solution Approach 2:
The patent changes the parameter of computation interval based on the injection mode. By switching between different computation intervals (first interval for single-injection, second interval for multi-injection), the system adapts its computational characteristics to match the requirements of different fuel injection scenarios, thereby resolving the contradiction between processing load and accuracy.
2Measurement precision
If the computation interval of the target injection amount is set as a short interval, then the changes of the parameter values are reflected to the computation of the control values, but the processing load on the computation is excessively increased
Solution Approach 1:
The system dynamically selects the appropriate computation interval based on the injection mode. For multi-injection control where parameter changes are critical, a shorter second interval is used. For single-injection control where parameter changes are less critical, a longer first interval is used. This dynamic selection prevents excessive processing load while maintaining necessary accuracy.
Solution Approach 2:
The computation interval parameter is changed according to the injection mode. The control section switches between the first computation interval and the second computation interval based on whether single-injection or multi-injection control is being executed, thereby optimizing the balance between accuracy and processing load.
3Measurement precision
If the engine speed is sampled at crank angle intervals of 10° when the engine speed is relatively low, then the change of the engine speed is reflected to the computation of the target injection amount, but when the engine speed is relatively high, the change of the engine speed that hardly influences the intake air amount is reflected unnecessarily
Solution Approach 1:
The sampling interval is made dynamic and adapts to the engine speed conditions. The control section uses a first sampling interval (10° crank angle) when engine speed is low and parameter changes are significant, and switches to a second sampling interval (180° crank angle) when engine speed is high and parameter changes are minimal. This dynamic adjustment optimizes both accuracy and processing efficiency.
Solution Approach 2:
The sampling interval parameter is changed based on engine speed conditions. The system switches between different sampling intervals according to whether the engine speed is low or high, thereby reflecting parameter changes appropriately without unnecessary processing.
Data Source
AI summary
When single-injection control is executed, processing for initiating full injection is executed at a crank angle immediately before initiation of each fuel injection among crank angles at crank angle intervals of 30°. When multi-injection control is executed, processing for initiating the fuel injection is executed at a crank angle immediately before the initiation of the each fuel injection among crank angles at crank angle intervals of 10°.