Steering Control System for Wheeled Work Vehicles
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Solution Overview
Problem
Existing work vehicles, particularly load-handling vehicles, face stability issues during steering maneuvers due to factors like vehicle speed and lifting arm position, which can lead to dangerous rolling over.
Innovation Solution
A steering control system that includes a filtering module to limit the rate of steering angle change based on lifting arm orientation and vehicle speed, using sensors to detect these parameters and generate a steering setpoint signal within predefined ceilings to ensure safe steering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the steering wheel is turned quickly to change direction rapidly, then the productivity and responsiveness of the vehicle is improved, but the vehicle stability deteriorates and risk of rollover increases
Solution Approach 1:
The steering control system dynamically adjusts the maximum steering speed limit based on real-time vehicle operating conditions including lifting arm position, vehicle speed, and load weight. The system transitions from a fixed steering limit to a dynamic one that adapts to changing operational parameters, allowing faster steering when conditions permit and slower steering when stability is compromised
Solution Approach 2:
The system changes the parameter of maximum steering speed based on multiple input parameters such as lifting arm elevation angle, vehicle forward speed, and detected load weight. By continuously monitoring these parameters and adjusting the steering speed limit accordingly, the system optimizes the trade-off between steering responsiveness and vehicle stability
2Stability of the object's composition
If the steering speed is limited to maintain vehicle stability, then the vehicle stability is improved, but the steering maneuver time increases and productivity decreases
Solution Approach 1:
The system implements dynamic steering limits that adjust in real-time based on vehicle operating conditions. When the lifting arm is in stable positions and vehicle speed is low, the system permits faster steering maneuvers. When conditions indicate potential instability, the system automatically reduces the maximum steering speed, creating an adaptive balance between stability and productivity
Solution Approach 2:
The steering control system continuously monitors vehicle state parameters and provides feedback to adjust steering speed limits. Sensors detect lifting arm position, vehicle speed, and load conditions, and this feedback is used to dynamically modify the maximum allowable steering rate, ensuring stability while minimizing impact on maneuver speed
3Reliability
If the steering control system incorporates multiple parameters and dynamic limits, then the vehicle stability and safety are improved, but the device complexity increases
Solution Approach 1:
The steering control system is designed to perform multiple functions within a single integrated control unit. It simultaneously monitors lifting arm position, vehicle speed, calculates dynamic steering limits, and controls the steering actuator. This multi-functionality reduces the need for separate dedicated systems for each function while maintaining comprehensive safety control
Data Source
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AI summary
The invention relates to a wheeled work vehicle comprising a lifting arm and a steering control system. The steering control system is configured to receive a turn request signal and a parameter for orienting the lifting arm, and to generate a turn instruction signal (D, E) that is representative of a turning angle of the steering wheels and is intended to control a turn actuator. The steering control system comprises a filter module (103) configured to determine a first rate-of-change limit on the basis of the parameter for orienting the lifting arm and to generate the turn instruction signal (D, E) on the basis of the turn request signal such that a rate of change of the turn instruction signal does not exceed the first rate-of-change limit.