Industrial Truck Motor Speed Control for Stable Loader Operation
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Solution Overview
Problem
The existing control methods for drive motor speed in utility vehicles, such as tractors with front loaders, often result in unwanted accelerations or decelerations due to the interdependence of engine power and vehicle speed, affecting driver comfort and operational efficiency.
Innovation Solution
A method that predicts or recognizes the movement drive of the loading device and automatically adjusts the engine speed of the drive motor, maintaining vehicle speed independently of loading device operations by controlling the transmission ratio and limiting fuel consumption through targeted engine speed increases and decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the engine speed is increased to provide power for loading device movements, then the loading device can operate effectively, but the vehicle speed becomes unstable and driver comfort deteriorates
Solution Approach 1:
The control system predicts future loading device movements based on current operating state and preemptively adjusts engine speed before the movements occur. This preliminary action ensures power availability while smoothing out speed variations that would otherwise affect vehicle stability and driver comfort.
Solution Approach 2:
The system continuously monitors the operating state of the loading device and uses this feedback to dynamically adjust engine speed. By closing the control loop, the system can compensate for power demands in real-time while maintaining stable vehicle speed, thus resolving the contradiction between power availability and driver comfort.
2Reliability
If the engine speed is constantly increased to ensure power availability for loading device movements, then the loading device operates without interruption, but fuel consumption increases
Solution Approach 1:
The system predicts when loading device movements will occur and only increases engine speed in advance of these predicted events. By avoiding continuous engine speed elevation and only increasing it when needed, the system maintains loading device operation reliability while significantly reducing unnecessary fuel consumption.
Solution Approach 2:
Instead of maintaining constantly elevated engine speed, the system applies periodic engine speed increases only when predicted loading movements are detected. This intermittent approach ensures operational reliability while minimizing energy consumption during periods when loading device movements are not anticipated.
3Power
If the engine speed is adjusted in response to loading device movements, then the loading device receives necessary power, but unwanted vehicle acceleration or deceleration occurs
Solution Approach 1:
The control system adjusts engine speed in advance of predicted loading device movements, allowing the power delivery to be smoothed out before the actual movements occur. This preemptive adjustment prevents sudden power transfers that would cause unwanted vehicle acceleration or deceleration, maintaining vehicle speed stability while still providing necessary power to the loading device.
Data Source
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AI summary
The invention relates to a method for controlling the rotational speed of a drive motor of a commercial vehicle (10) with a drivable loading device (12), with a movement drive of the loading device (12) being predicted or recognized, and with a predicted or recognized movement drive of the loading device (12) an increase the engine speed of the drive motor is requested.