Transmission Control for Low-Output Work Machine Acceleration
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Solution Overview
Problem
In work machines, the low-output mode selected on flat ground or low-gradient roads leads to decreased vehicle speed and acceleration, making it difficult to quickly suppress these reductions, and results in inefficient fuel consumption.
Innovation Solution
A control system that selectively executes a first and second mode, where the target tractive force is limited in the second mode, and the limitation is weakened when the machine's acceleration is below a threshold, allowing for adjustment of the transmission gear ratio to quickly address speed and acceleration reductions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the low-output mode is selected to improve fuel consumption, then fuel efficiency is improved, but vehicle speed and acceleration are decreased
Solution Approach 1:
The patent implements dynamic switching between low-output mode and high-output mode based on real-time acceleration detection. When acceleration falls below a threshold, the system transitions from low-output to high-output mode, making the system adaptable rather than static. This resolves the contradiction by allowing the vehicle to operate in fuel-efficient low-output mode during normal conditions while automatically switching to performance-oriented high-output mode when acceleration performance becomes insufficient.
Solution Approach 2:
The patent employs a feedback mechanism where acceleration is continuously monitored and used to control mode switching. The acceleration threshold serves as a feedback criterion that triggers the transition between operational modes. This closed-loop control ensures that the system responds to actual performance conditions, maintaining fuel efficiency when acceleration is adequate while automatically improving acceleration performance when needed.
2Use of energy by moving object
If the low-output mode is selected to improve fuel consumption, then fuel efficiency is improved, but acceleration is decreased
Solution Approach 1:
The system dynamically adjusts its operational mode based on real-time acceleration performance. When the detected acceleration falls below the predetermined threshold, the system automatically transitions from low-output mode to high-output mode, making the acceleration characteristic adaptable rather than fixed. This resolves the contradiction by allowing the system to maintain fuel efficiency during normal operation while ensuring adequate acceleration performance when required.
Solution Approach 2:
The patent uses acceleration feedback to control mode switching. The acceleration threshold acts as a trigger condition that determines when to switch from fuel-efficient low-output mode to high-performance high-output mode. This feedback mechanism ensures that acceleration performance is maintained above acceptable levels while maximizing fuel efficiency during normal operating conditions.
3Force
If the target tractive force is increased to improve acceleration, then acceleration performance is improved, but fuel consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of target tractive force through mode switching. In low-output mode, the target tractive force is limited to conserve fuel, while in high-output mode, the target tractive force is increased to improve acceleration. The system dynamically selects the appropriate tractive force level based on real-time acceleration detection, resolving the contradiction by making tractive force adaptable to actual performance needs rather than fixed at high levels.
Solution Approach 2:
The patent changes the target tractive force parameter based on operational mode. When switching from low-output to high-output mode, the target tractive force parameter is increased to improve acceleration performance. Conversely, when operating in low-output mode, the target tractive force is reduced to improve fuel efficiency. This parameter change strategy allows the system to optimize the balance between acceleration and fuel consumption based on actual conditions.
Data Source
AI summary
A work machine includes an engine, a transmission connected to the engine to change a transmission gear ratio continuously, a travel device connected to the transmission to cause the work machine to travel, a sensor arranged and configured to detect an acceleration of the work machine, and a controller. The controller selectively execute a first mode and a second mode that limits a target tractive force of the machine in comparison to the first mode. The controller weakens limitation of the target tractive force and determines the target tractive force when the acceleration of the machine in the second mode is less than a predetermined acceleration threshold. The controller determines a target transmission gear ratio in accordance with the target tractive force. The controller controls the transmission based on the target transmission gear ratio.