Walk-Behind Lawnmower Control-by-Wire System
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Solution Overview
Problem
Walk-behind machines, such as lawnmowers, lack efficient control systems that allow operators to easily manage the propulsion and implement operations without manual lever or throttle adjustments, leading to cumbersome operation and reduced convenience.
Innovation Solution
A control-by-wire system that includes a touch sensor on the handle to detect operator presence and transmit contact signals, enabling electronic control of the power source and propulsion drive assembly, allowing for intuitive operation of the implement and propulsion speed management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical user inputs (throttle lever, cable, rotary knob) are used to control the machine, then the operator can manually adjust implement and propulsion speeds, but the operation becomes cumbersome and operator fatigue increases
Solution Approach 1:
The patent replaces mechanical control systems (throttle levers, cables, rotary knobs) with an electronic control system that uses touch sensors to detect operator presence and intent. The touch sensor detects electrical properties of the operator's body to determine when the operator is present or absent, automatically controlling the power source and propulsion drive assembly without requiring manual mechanical adjustments.
Solution Approach 2:
The control system provides self-service functionality by automatically detecting operator presence through the touch sensor and autonomously managing the power source and drive assemblies. When the operator approaches or touches the handle, the system automatically activates the power source and prepares the implement and propulsion systems, eliminating the need for manual engagement of mechanical controls.
2Ease of operation
If manual lever or throttle adjustments are required for propulsion control, then speed can be precisely controlled, but operator convenience is reduced and fatigue increases
Solution Approach 1:
The patent substitutes mechanical throttle and lever controls with an electronic touch-sensing system that detects the operator's presence and proximity. The touch sensor monitors electrical properties to determine when the operator is near or touching the handle, automatically adjusting propulsion speed and power source operation accordingly, providing both convenience and reliable control.
Solution Approach 2:
The control system incorporates feedback through the touch sensor, which continuously monitors the operator's presence and position relative to the handle. This feedback loop allows the controller to automatically adjust the power source and propulsion drive assembly to match the operator's intended actions, ensuring reliable control while eliminating manual adjustments.
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 control-by-wire system simplifies operation by allowing hands-free control of the machine, enabling seamless transitions between cutting and propulsion modes, enhancing user convenience and reducing operator fatigue.
Implementation Method 1
a touch sensor mounted on the handle and configured to transmit a contact signal indicative of an operator of the walk-behind lawnmower physically contacting a predetermined location on the handle
Data Source
AI summary
A control system can be used for a walk-behind self-propelled machine that includes a handle, a power source, a drive assembly, and an implement selectively driven by the power source. The control system can include a touch sensor located on the handle configured to transmit a contact signal indicative of an operator of the walk-behind self-propelled machine physically contacting the handle at a predetermined location. The system can further include a controller that is in electrical communication with the touch sensor and configured to enable the power source to drive the implement, such as a lawnmower blade, when the controller receives the contact signal.