Working Machine Drive Control for Stable Variator Speed Regulation
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Solution Overview
Problem
Existing drive devices for working machines with power-branched transmissions and variators lack efficient control logic for optimizing motor rotation speed and power output, leading to suboptimal performance.
Innovation Solution
A method for determining a nominal motor rotation speed based on condition parameters and driving strategy, combined with detection of current motor load and accelerator pedal position, to regulate motor speed effectively using a proportional regulator, ensuring stable control even with variator-based transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power-branched transmission with a variator is used to enable continuous gear ratio adjustment, then the adaptability of the drive device is improved, but the stability of motor rotation speed control deteriorates
Solution Approach 1:
The patent implements a feedback control mechanism where the control unit continuously monitors the actual motor rotation speed and compares it with the target speed, then adjusts the accelerator pedal position signal accordingly to maintain stable speed despite the variator's continuous gear ratio changes
Solution Approach 2:
The control system dynamically adjusts the accelerator pedal position in real-time based on the current operating conditions and variator state, enabling the motor speed to remain stable while the gear ratio changes continuously through the power-branched transmission
2Productivity
If motor rotation speed is controlled directly to optimize efficiency and power output, then the productivity is improved, but the ease of operation deteriorates due to loss of direct accelerator pedal control
Solution Approach 1:
The control unit acts as an intermediary that translates the driver's accelerator pedal input into optimized motor control commands, maintaining the ease of pedal operation while implementing sophisticated speed optimization logic through the control algorithm
Solution Approach 2:
The control system automatically determines the optimal accelerator pedal position based on current operating conditions, eliminating the need for the driver to manually optimize speed settings while maintaining efficient operation through self-adjusting control
3Adaptability or versatility
If the motor rotation speed is allowed to vary freely to respond to changing load conditions, then the adaptability is improved, but the loss of energy increases due to excessive speed variations
Solution Approach 1:
The control system allows only the necessary minimum speed variation required to respond to load changes, preventing excessive speed fluctuations that would waste energy, while still maintaining adequate adaptability to handling conditions
Data Source
AI summary
A method is provided for operating a drive device (1) for a working machine (100). The drive device (1) has a motor (2) and a power-branched transmission (3) with a variator (5) for the continuously variable adjustment of a gear ratio of the transmission (3). The method includes determining a nominal motor rotation speed (n), receiving a current motor load (L) of the motor (2), and determining an accelerator pedal position (P) on the basis of the nominal motor rotation speed (n) determined and the motor load (L) received. In addition, the method includes transmitting the accelerator pedal position (P) determined to the motor (2).