Throttle Assembly Integrating Remote and Manual Control
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Solution Overview
Problem
Existing engine throttle control systems face challenges in seamlessly integrating remote and manual throttle control mechanisms, leading to inefficiencies in power management and user experience, particularly in small internal combustion engines used in devices like chainsaws and lawn mowers.
Innovation Solution
A throttle assembly that combines a remote throttle control lever and a manual throttle control lever, connected by a control lever stud, with a governor spring and throttle return spring system, allowing for coordinated control through mechanical coupling and external device operation, enabling precise engine speed regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single throttle control lever is used, then the device complexity is reduced, but the adaptability and versatility of control modes are limited
Solution Approach 1:
The patent combines a remote control lever and a manual control lever into a single integrated throttle control assembly. The remote control lever connects to the throttle through a linkage mechanism, while the manual control lever provides direct user input. Both levers share common components including the throttle body, return spring, and governor mechanism, achieving multi-mode control without proportionally increasing system complexity.
Solution Approach 2:
The throttle control assembly is designed to support multiple control functions through a single unified structure. The same assembly can operate in remote control mode (for applications like chainsaws and lawn mowers), manual control mode, or a combination thereof. The universal design allows the system to adapt to different operational requirements without requiring separate control mechanisms for each mode.
2Ease of operation
If remote control and manual control are integrated, then the ease of operation is improved, but the difficulty of detecting and measuring control interactions increases
Solution Approach 1:
The patent introduces a control interaction detection mechanism that acts as an intermediary between the remote and manual control levers. This mechanism, implemented through a detent mechanism with detent positions and a detent lever, provides tactile feedback and mechanical indication of the current control mode and throttle position. The intermediary mechanism makes the control interactions detectable through physical sensation and mechanical position sensing, eliminating the need for complex electronic sensors.
3Productivity
If precise speed regulation is implemented, then the productivity and power management efficiency are improved, but the device complexity increases
Solution Approach 1:
The throttle control assembly incorporates a governor mechanism with a governor spring that automatically regulates engine speed based on load conditions. The governor mechanism self-adjusts the throttle position to maintain optimal engine speed without requiring external control systems or complex electronic sensors. The return spring and governor spring work together to provide automatic feedback control, achieving precise speed regulation through passive mechanical means that minimize additional 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 solution provides a seamless integration of remote and manual control, enhancing engine power management and user experience by allowing for precise speed regulation and efficient power adjustment, maintaining engine speed within a predetermined range despite varying loads.
Implementation Method 1
a governor spring (10) attached to the remote throttle control lever (4)
Implementation Method 2
a throttle return spring (13) that applies a force to the remote throttle control lever (4)
Data Source
AI summary
A throttle assembly for an engine includes a remote control throttle lever, a manual throttle control lever, and a throttle return spring. The remote control throttle lever is configured to operate the throttle assembly and the engine based on a force received from an external device. The manual throttle control lever is configured to operate the throttle assembly and the engine based on a force received from a user input at an input portion of the manual throttle control lever. An abutment portion of the manual throttle control lever is spaced from the input portion of the manual throttle control lever and configured to abut the remote control throttle lever. The throttle return spring is configured to bias the remote control throttle lever against the abutment portion of the manual throttle control lever in an opposite direction of the force received from the external device.