Automatic Idle System for Small Engines Using Load-Sensing Governor Linkage
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Solution Overview
Problem
Small combustion engines in equipment like pressure washers and lawnmowers typically run at high speeds even when not actively working, leading to increased noise, reduced component life, and higher fuel consumption due to fixed speed governance systems that do not adjust for varying load conditions.
Innovation Solution
An automatic idle system for small engines featuring a multi-piece governor linkage with an actuator that adjusts the throttle based on engine load, allowing the engine to idle at a lower speed when unloaded and quickly return to high speed when loaded, utilizing a vacuum actuator to manage the throttle position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the governor speed range is set to a relatively high engine speed to maximize pump flow, pressure, and cutting performance, then performance characteristics are improved, but noise levels increase, pump and engine life are reduced, and fuel consumption increases
Solution Approach 1:
The governor linkage is designed with a movable connection between the first and second portions, allowing the system to dynamically adjust the throttle control position based on actual engine load conditions. This enables the engine speed to vary between high-speed governed operation under load and lower idle speed when unloaded, rather than maintaining a fixed high speed setting.
Solution Approach 2:
The system changes the operating parameter of engine speed based on load conditions. By moving the second portion of the governor linkage to different positions (toward throttle-closed position when unloaded), the engine speed parameter is adjusted between high and low states, optimizing both performance and efficiency.
2Productivity
If the engine runs at high speed to maximize performance, then pump flow and pressure are improved, but engine and pump life are reduced due to continuous high-speed operation
Solution Approach 1:
The movable connection in the governor linkage allows dynamic adjustment of the throttle control position. When the engine is unloaded, the second portion moves toward the throttle-closed position, automatically reducing engine speed and minimizing wear, thereby extending the duration of engine and pump operation.
3Device complexity
If a fixed governor arm configuration is used, then the speed regulation system is simple, but the governed speed range cannot be easily adjusted for different operating conditions
Solution Approach 1:
The governor arm is divided into two separate portions (first portion connected to governor shaft, second portion connected to throttle control) with a movable connection between them. This segmentation allows the second portion to move independently relative to the first portion, enabling automatic adjustment of the governed speed range based on load conditions without increasing overall system complexity.
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 reduces engine noise, prolongs engine and pump life, and decreases fuel consumption by allowing the engine to operate at lower speeds during low-load conditions while maintaining high-speed performance when needed.
Implementation Method 1
an actuator (e.g., a vacuum actuator) can be connected to the second portion of the governor linkage, the actuator being movable in response to a load on the engine
Data Source
AI summary
The present subject matter relates to arrangements and uses for engine speed governors. In particular, an automatic idle system for a small engine can include an engine speed governor for connection to a small engine with a governor shaft rotatable in response to a speed of the engine. A governor linkage can include a first portion for connection to the governor shaft and a second portion for connection to a throttle control of the engine, the first portion being movably connected with or to the second portion. An actuator can be connected to the second portion of the governor linkage, the actuator being movable in response to a load on the engine to move the second portion relative to the first portion. In this configuration, when the engine is in a low-load state, the second portion can be moved relative to the first portion toward a throttle-closed position.