Engine Control Device Stabilizing Fuel Injection During Acceleration
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Solution Overview
Problem
Existing engine control devices experience unstable fuel injection due to rapid changes in correction quantities during acceleration, making it difficult to maintain a target air-fuel ratio.
Innovation Solution
An engine control device that includes an oxygen density detection system, a fuel injection time calculation mechanism, and a correction quantity storage system to stabilize fuel injection by holding the pre-acceleration correction quantity and adjusting fuel injection time based on stored values, even when oxygen feedback control is stopped during acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If oxygen feedback control is stopped during acceleration to prevent engine output reduction, then engine response speed is improved, but correction quantity changes rapidly causing fuel injection instability
Solution Approach 1:
The patent stores the correction quantity calculated before acceleration in a storage unit. During acceleration, this pre-calculated correction quantity is retrieved and used to maintain stable fuel injection, avoiding the instability caused by real-time calculation during acceleration while still achieving rapid engine response.
Solution Approach 2:
The patent introduces a storage unit as an intermediary between the correction quantity calculation and the fuel injection control. This storage unit holds the correction quantity during acceleration, acting as a buffer that decouples the real-time control requirement from the calculation process, thereby maintaining stability without sacrificing response speed.
2Adaptability or versatility
If correction quantity is rapidly changed to adjust air-fuel ratio during acceleration, then air-fuel ratio adjustment capability is improved, but fuel injection quantity becomes unstable
Solution Approach 1:
The correction quantity is calculated and stored before acceleration occurs. During acceleration, this pre-calculated value is used without rapid changes, maintaining fuel injection stability while still achieving the necessary air-fuel ratio adjustment through the stored correction value.
Solution Approach 2:
The patent dynamically switches between real-time correction quantity calculation and stored correction quantity usage based on engine operating conditions. During normal operation, real-time calculation provides adaptability; during acceleration, stored values provide stability. This dynamic switching resolves the contradiction between adjustment capability and stability.
Data Source
AI summary
An engine control device and method that prevents fuel injection quantity from becoming unstable due to a rapid change of a correction quantity even in a predetermined operation state such as acceleration time and thus stabilizes an air-fuel ratio. Under a predetermined operating state, even when feedback control of oxygen in exhaust gas is stopped, a correction quantity immediately before the predetermined operating state is held by a correction quantity storage part and the correction of the fuel injection time is performed based on the correction quantity.