Wheel Loader Brake Control for Slope-Induced False Obstacle Detection
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Solution Overview
Problem
Conventional collision suppression systems in wheel loaders mistakenly detect the ground surface as an obstacle during scooping work on sloped terrain, leading to unnecessary obstacle warnings and braking, which disrupts the operation.
Innovation Solution
A control system that uses an inclination angle sensor to determine if the vehicle body is within a certain angle threshold, disabling automatic brake control and obstacle warnings during scooping work to prevent false detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the obstacle detection sensor is used to detect the ground surface during reverse travel, then obstacle detection capability is improved, but false detection of ground surface as obstacle occurs during scooping work
Solution Approach 1:
The system changes the operational parameters of the obstacle detection sensor based on the detected inclination angle. When the inclination angle exceeds the threshold during scooping work, the sensor output is suppressed or its detection range is restricted, preventing false detection of the ground surface while maintaining accurate obstacle detection during normal operation
Solution Approach 2:
The inclination angle sensor acts as an intermediary that provides context information to the control unit. By detecting the vehicle's inclination angle, the system can determine whether the obstacle detection sensor is viewing the ground surface or actual obstacles, and adjust its operation accordingly to prevent false detections
2Reliability
If automatic brake control is activated based on obstacle detection, then collision prevention is improved, but unnecessary braking occurs during scooping work
Solution Approach 1:
The control unit changes the activation parameters of the automatic brake control based on the inclination angle. When the inclination angle exceeds the threshold, the brake control is suppressed or its sensitivity is reduced, preventing unnecessary braking during scooping work while maintaining effective collision prevention during normal operation
Solution Approach 2:
The automatic brake control system dynamically adjusts its behavior based on real-time inclination angle data. The system transitions between different operational states (normal brake control, suppressed brake control) depending on whether the vehicle is on level ground or inclined terrain, making the brake system adaptive to working conditions
3Reliability
If obstacle warning is enabled during reverse travel, then safety monitoring is improved, but unnecessary warnings are generated during scooping work
Solution Approach 1:
The control unit changes the warning output parameters based on the inclination angle. When the inclination angle exceeds the threshold, the warning device is suppressed or its sensitivity is reduced, preventing false warnings during scooping work while maintaining accurate safety monitoring during normal reverse travel operations
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
Prevents false obstacle detections during scooping work by selectively enabling or disabling brake control and warnings based on the vehicle's inclination angle, ensuring smooth operation without unnecessary interruptions.
Implementation Method 1
detect an inclination angle of the vehicle body by an inclination angle sensor configured to detect the inclination angle of the vehicle body
Data Source
AI summary
A system is provided for controlling a work machine including a vehicle body including a traveling unit. The system includes a controller. The controller is configured to detect an inclination angle of the vehicle body using an inclination angle sensor configured to detect the inclination angle of the vehicle body. The controller is configured to disable automatic brake control for braking the traveling unit and/or notification by an alarm device when the inclination angle is equal to or greater than a first predetermined value. The controller is configured to enable the automatic brake control and/or the notification by the alarm device when the inclination angle is equal to or smaller than a second predetermined value that is smaller than the first predetermined angle, based on a detection result of an obstacle behind the vehicle body by an obstacle detection sensor disposed on a rear part of the vehicle body.