Work Vehicle Steering Control System for Operator Exit Safety
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Solution Overview
Problem
Work vehicles with elevated cabs pose a risk of unintended movement when operators exit, as the large wheels or tracks can lift the cab significantly, potentially causing the ladder used for access to interfere with the vehicle's steering mechanism, leading to unsafe conditions.
Innovation Solution
A control system that includes a processor-based controller receiving signals from sensors such as load cell sensors, door sensors, and proximity sensors to determine if an operator is outside the cab, and if so, disables the steering control system to prevent the rear assembly from moving, thereby preventing ladder interference with the tracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the cab is elevated significantly from the ground using large wheels or tracks, then the operator has better visibility and access to the work area, but the ladder used for access may interfere with the vehicle's steering mechanism when the operator exits
Solution Approach 1:
The control system proactively disables the steering control system before the operator exits the cab by detecting door opening signals or proximity sensor readings indicating an approaching operator. This preliminary action prevents the ladder from interfering with the steering mechanism by ensuring the rear assembly cannot move while the operator is in the process of exiting.
Solution Approach 2:
The system uses sensors (door sensors, proximity sensors, load cell sensors) to continuously monitor the operator's status and provides feedback to the controller. When the sensor detects that the operator is exiting or has exited the cab, the controller responds by disabling the steering control system, creating a closed-loop safety mechanism that adapts to the operator's position.
2Speed
If the steering control system remains active during operator exit, then the vehicle can respond quickly to steering inputs, but unintended movement may occur causing safety hazards
Solution Approach 1:
The control system is designed to disable steering functionality in advance before the operator actually exits the cab. By detecting door opening or proximity sensor signals that indicate an exiting operator, the system proactively deactivates the steering control system, preventing any possibility of unintended movement while maintaining quick response when the operator is properly seated and the door is closed.
3Reliability
If sensors are installed to detect operator position, then safety can be improved, but the device complexity increases
Solution Approach 1:
The patent uses intermediate sensing elements such as door sensors that detect door opening status and proximity sensors that detect operator proximity to the cab. These intermediary sensors provide indirect but reliable information about operator position without requiring complex direct monitoring systems, thereby maintaining safety while limiting the increase in device 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
Ensures safe operation by preventing unintended movement of the ladder and tracks when an operator is exiting the cab, enhancing safety and preventing potential accidents.
Implementation Method 1
at least one load cell sensor that generates a load signal indicative of a weight, wherein the load cell sensor generates the load signal in response to detection of a load on a work vehicle
Data Source
AI summary
A work vehicle control system including a steering control system that controls steering of a work vehicle. A controller including a processor and memory, wherein the controller receives a signal indicative of a probability of an operator being outside of a cab of the work vehicle, and wherein the controller disables the steering control system in response to the signal.