Wheel Loader Reverse Braking Control for Unstable Vehicle States
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Solution Overview
Problem
In construction settings, work machines like wheel loaders often operate in unstable conditions, leading to inefficient braking when obstacles are detected, which can cause the machine to fall and interrupt work.
Innovation Solution
A work machine equipped with a state detection system and a rear detection system, controlled by a controller that adjusts braking based on the vehicle's state and detected obstacles, allowing for improved braking efficiency without causing the machine to fall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic braking is activated when an obstacle is detected while traveling backward, then safety is improved, but work efficiency deteriorates due to unnecessary braking in unstable states
Solution Approach 1:
The braking system transitions from a static on/off control to a dynamic system that continuously adjusts braking force based on real-time vehicle state detection. The controller modulates braking intensity according to stability parameters (articulation angle, boom/cylinder positions), enabling the system to apply minimal or no braking when the vehicle is unstable, while providing full braking when stable, thus resolving the contradiction between safety and work efficiency
Solution Approach 2:
The system changes the parameter of braking force from a binary state (brake/not brake) to a continuous variable that can be adjusted based on vehicle stability conditions. By detecting parameters such as articulation angle, boom height, and cylinder position, the system dynamically adjusts the braking force parameter to match the actual stability state, preventing unnecessary full braking while maintaining safety when appropriate
2Speed
If braking force is increased to stop the vehicle body quickly, then stopping distance is reduced, but vehicle stability deteriorates causing the machine to fall
Solution Approach 1:
The system dynamically adjusts braking force based on real-time stability assessment. When the vehicle is in an unstable state (large articulation angle, elevated boom, extended cylinders), the controller reduces or suppresses braking force to prevent falling. When the vehicle is stable, full braking force is applied to achieve short stopping distance. This dynamic adaptation resolves the contradiction between stopping distance and vehicle stability
Solution Approach 2:
The system performs beforehand cushioning by detecting unstable states in advance and preemptively reducing braking force before the vehicle can fall. The state detection section continuously monitors stability parameters, and when instability is detected, the controller prepares the braking system to apply reduced force, preventing the harmful effect of falling while still providing some deceleration
Data Source
AI summary
The wheel loader includes a rear detection section, a state detection section, and a controller. The rear detection section detects rearward of the vehicle body when moving backward. The state detection section detects a state of the vehicle body. The controller brakes the vehicle body based on the detection of the state detection section and the detection of the rear detection section.