Starting Fuel Valve Timing for Stable Idle and Smooth Acceleration
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Solution Overview
Problem
Conventional engine control devices face issues with unstable idle states, engine stalls, and acceleration lags due to variations in fuel type, atmospheric pressure, and temperature, leading to inefficient fuel supply and potential vapor lock, especially in handheld engine-driven machines.
Innovation Solution
An engine control device with a starting fuel supply valve that adjusts its opening time based on engine speed and temperature, using detection units to ensure a stable and appropriate fuel supply, preventing excessively rich or lean air-fuel states and maintaining smooth acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the opening time of the electromagnetic on-off valve is controlled to create a rich air-fuel state, then a stable idle operation is achieved, but an excessively rich air-fuel state occurs depending on fuel type, resulting in engine stop
Solution Approach 1:
The patent applies parameter changes by adjusting the valve opening time based on detected fuel type. The control unit modifies the opening time parameter dynamically according to fuel characteristics (e.g., ethanol content), preventing excessively rich mixtures that would cause engine stop while maintaining stable idle operation. This resolves the contradiction by adapting the control parameter to fuel variations.
Solution Approach 2:
The patent implements feedback control by detecting fuel type and using this information to adjust the valve opening time. The control unit receives fuel type detection results and modifies the opening time accordingly, creating a closed-loop system that prevents excessively rich air-fuel states while ensuring stable idle operation across different fuel types.
2Stability of the object's composition
If the valve opening time is set based on a fuel type that is likely to create a rich air-fuel state, then stable idle operation is achieved, but engine stall or acceleration lags occur because the air-fuel mixture becomes excessively lean
Solution Approach 1:
The patent applies parameter changes by adjusting the valve opening time based on detected fuel type. When a fuel type prone to lean burning is detected, the control unit modifies the opening time parameter to prevent excessively lean mixtures that would cause acceleration lags, while still maintaining stable idle operation. This dynamic adjustment resolves the contradiction between idle stability and acceleration performance.
3Loss of energy
If a fuel that is likely to cause lean burning is used, then engine efficiency is improved, but the starting fuel supply device may be affected by conditions such as atmospheric pressure, causing unstable idle state
Solution Approach 1:
The patent applies parameter changes by adjusting the valve opening time based on detected fuel type and atmospheric pressure conditions. When a lean-burning fuel is detected, the control unit modifies the opening time parameter to compensate for atmospheric pressure variations, preventing unstable idle states while maintaining fuel efficiency. This multi-parameter adjustment resolves the contradiction between fuel efficiency and idle stability.
Data Source
AI summary
An engine control device that regulates fuel to be supplied to an engine including: a starting fuel supply valve that supplies starting fuel to air to the engine or to an air-fuel mixture of air and fuel in starting the engine; an engine temperature detection unit that detects an engine temperature of the engine; an engine speed detection unit that detects the engine speed of the engine; and a control unit that controls the starting fuel supply valve to open and close to control the engine, in which the control unit controls an opening time of the starting fuel supply valve according to the engine temperature and the engine speed.