Grass Mower Tilt Detection with Dual Alarm Thresholds
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Solution Overview
Problem
Conventional grass mowers rely solely on driver attention to prevent machine body tilting, which can lead to traveling dangers and inadvertent grass scraping, especially when transitioning between sloped and horizontal grass-grown lands, lacking effective mechanisms to distinguish between tilt angles that pose traveling hazards and those that cause grass scraping.
Innovation Solution
A grass mower equipped with a tilt detector, display device, and dual informing devices (orange and red alarm lamps) to alert the driver of rolling angles exceeding specific tilt angles, with the option to suspend the grass scraping alarm temporarily to avoid false alerts, ensuring the driver's attention is drawn to both traveling dangers and potential grass scraping incidents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single tilt alarm system is used to prevent traveling danger, then traveling safety is improved, but the system cannot distinguish between traveling danger and grass scraping scenarios
Solution Approach 1:
The single tilt alarm system is segmented into two distinct alarm systems: a first alarm system for traveling danger (using a first tilt sensor and first alarm device) and a second alarm system for grass scraping prevention (using a second tilt sensor and second alarm device). Each alarm system has its own threshold and alert mechanism, allowing the system to differentiate between critical traveling dangers and less severe grass scraping scenarios based on the specific tilt conditions detected by each sensor.
2Adaptability or versatility
If dual alarm systems are implemented to distinguish between traveling danger and grass scraping, then scenario discrimination is improved, but device complexity increases
Solution Approach 1:
The first tilt sensor and second tilt sensor are integrated into a single tilt sensor unit that can detect tilt angles in different directions or modes. Similarly, the first alarm device and second alarm device are merged into a single alarm notification system that can deliver different alert types (visual, auditory, or haptic) based on the detected scenario. This merging reduces the overall component count and simplifies the system architecture while maintaining the dual-scenario discrimination capability.
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 alerts the driver to both traveling dangers and grass scraping possibilities, reducing the risk of accidents by providing distinguishable alerts and optimizing space usage in compact designs, while minimizing nuisance alarms during safe operations on sloped lands.
Implementation Method 1
a tilt detector for detecting a rolling angle of the machine body
Data Source
AI summary
A grass mower includes a frame that extends in a front/rear direction of a machine body, a mower deck supported to/under the frame, the mower deck extending in a transverse direction of the machine body, a side edge of the mower deck protruding laterally from the machine body, a tilt detector for detecting a rolling angle of the machine body, a display device for displaying the rolling angle, a first informing device for effecting a first informing for calling attention to grass scraping by the side edge when a rolling angle detected by the tilt detector exceeds a first tilt angle and a second informing device for effecting a second informing for calling attention to traveling danger when the rolling angle detected by the tilt detector exceeds a second tilt angle.