Engine Drive System Idle Speed Stabilization
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Solution Overview
Problem
In engine drive systems using a magneto AC generator, the idle rotational speed fluctuates significantly when an electrical load is connected or disconnected, leading to potential engine stalling and poor fuel efficiency, particularly when an open-type regulator is used.
Innovation Solution
An engine drive system with an open-type regulator and an electronic control unit that detects load fluctuations, adjusts the ISC valve's opening degree to minimize rotational speed fluctuations by applying a corrected target opening degree for a limited time, ensuring stable idling and preventing stalling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an open-type regulator is used to adjust generator voltage, then fuel efficiency is improved, but idle rotational speed stability deteriorates
Solution Approach 1:
The control unit predicts future electrical load changes based on predetermined patterns (such as anticipated load increases or decreases) and adjusts the ISC valve opening degree in advance. This preliminary action compensates for the mechanical load variations caused by the open-type regulator before they affect idle rotational speed, thereby maintaining stability while preserving fuel efficiency benefits.
2Ease of operation
If an open-type regulator is used, then voltage adjustment is achieved, but idle rotational speed fluctuation increases
Solution Approach 1:
The control unit continuously monitors the actual idle rotational speed and compares it with the target value. Based on this feedback, the control unit adjusts the ISC valve opening degree to compensate for speed fluctuations caused by the open-type regulator's voltage adjustment operations, thereby maintaining stable idle speed while preserving voltage control capability.
3Stability of the object's composition
If load fluctuation compensation control is implemented, then idle rotational speed stability is improved, but control system complexity increases
Solution Approach 1:
The control unit utilizes existing sensors and processing capabilities already present in the engine control system. The control algorithm leverages available data about electrical load conditions and engine operating parameters to automatically adjust the ISC valve, enabling the system to self-compensate for load fluctuations without requiring additional dedicated hardware or complex external control systems.
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
The system effectively stabilizes idle rotational speed and reduces fuel consumption by anticipating and correcting for load changes, preventing engine stalling and maintaining efficient operation.
Implementation Method 1
an ISC valve 7 that bypasses a throttle valve
Implementation Method 2
a magneto AC generator (magneto) driven by the engine
Implementation Method 3
a regulator that rectifies an AC output of the generator and adjusts an output voltage of the magneto AC generator
Data Source
AI summary
Disclosed is an engine drive system that uses an open-type regulator as a regulator that rectifies an output and adjusts a voltage of a magneto AC generator driven by an engine. A means is provided that performs a process of increasing an opening degree of an ISC valve for a limited amount of time when a load of the generator is applied, while the engine is idling. Temporarily increasing an output torque of the engine prevents a rotational speed of the engine from dramatically decreasing, or the engine from stalling, during idling.