Forklift Travel Control on Slopes With Gradient-Based Accel Cutoff
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Solution Overview
Problem
Industrial vehicles, such as forklifts, experience a phenomenon where they are pushed down on inclined roads due to the accel drive function when traveling at speeds greater than 2.4 km/h, leading to potential accidents.
Innovation Solution
A travel control method and apparatus that detects the gradient of the road surface and adjusts the accel drive function based on this gradient, turning it off when the gradient exceeds a reference value to prevent the vehicle from being pushed down, and controlling the travel apparatus based on the manipulation of direction levers and pedals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the accel drive function is activated on an inclined road, then the industrial vehicle can accelerate faster, but the vehicle may be pushed down causing safety issues
Solution Approach 1:
The control device detects the gradient of the road surface and uses this feedback information to determine whether to activate the accel drive function. When the gradient exceeds a predetermined threshold, the system automatically disables the accel drive function, preventing the vehicle from being pushed down while allowing normal acceleration on flat or gentle slopes.
Solution Approach 2:
The system changes the operational parameters of the accel drive function based on the detected road gradient. By adjusting the activation state of the accel drive function according to the gradient parameter, the system optimizes both acceleration performance and safety without requiring complex mechanical modifications.
2Reliability
If the accel drive function is turned off on inclined roads, then vehicle safety is improved, but acceleration performance is reduced
Solution Approach 1:
The system applies different control strategies to different road conditions. On flat or gentle slopes, the accel drive function remains active providing full acceleration capability. On steep inclined roads, the function is disabled to ensure safety. This localized approach ensures optimal performance in each specific operating condition.
Solution Approach 2:
The control system dynamically adjusts the accel drive function based on real-time gradient detection. The system can switch between different operational modes (accel drive on/off) depending on the current road condition, providing adaptive control that balances safety and performance requirements.
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 industrial vehicles from being pushed down on inclined roads by effectively managing the accel drive function, ensuring safe operation and reducing the risk of accidents.
Implementation Method 1
a gradient detector configured to detect a gradient of a road surface on the basis of an output of an acceleration sensor of the industrial vehicle
Data Source
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AI summary
Disclosed is a travel control method and apparatus. A travel control method and apparatus according to the present embodiment includes detecting a travel speed of an industrial vehicle (1), detecting a gradient of a road surface, setting an accel drive function of the industrial vehicle (1) to be turned on or off, and controlling driving of a travel apparatus (50) on the basis of a state in which the accel drive function is turned on or off.