Work Vehicle Lock-Up Clutch Control for Acceleration Rate
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Solution Overview
Problem
Conventional work vehicles experience a decrease in acceleration rate due to premature switching of the lock-up clutch based on vehicle velocity, leading to inefficient power transmission during sudden accelerations.
Innovation Solution
A control unit in the work vehicle determines the switching of the lock-up clutch based on both vehicle velocity and acceleration rate, maintaining it in a not-connected state during high acceleration rates and switching it to a connected state when the acceleration rate is below a predetermined threshold, thereby minimizing the decrease in acceleration rate during sudden accelerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the lock-up clutch is switched to a connected state based on vehicle velocity reaching a predetermined velocity, then the driving force transmission efficiency is improved, but the acceleration rate decreases during sudden acceleration
Solution Approach 1:
The control unit monitors the acceleration rate as an additional parameter and adjusts the lock-up clutch switching decision based on whether the acceleration rate exceeds a threshold. This multi-parameter control approach resolves the contradiction by preventing clutch engagement during high acceleration scenarios while allowing it during normal velocity-based conditions, thus maintaining both transmission efficiency and acceleration performance
2Power
If the lock-up clutch is switched early based on vehicle velocity, then the power transmission is optimized, but the acceleration performance is degraded
Solution Approach 1:
The control unit continuously monitors the actual acceleration rate and uses this feedback to determine whether to engage the lock-up clutch. When the acceleration rate exceeds the threshold, the clutch remains disengaged to preserve acceleration performance. This feedback mechanism ensures that power transmission is optimized only when it does not compromise acceleration performance
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
This approach ensures that the lock-up clutch is not switched during sudden accelerations, maintaining acceleration and allowing for higher driving force generation when necessary, while reducing the shock associated with gear shifts by coordinating clutch and gear shifts based on vehicle velocity ranges.
Implementation Method 1
a torque converter with a lock-up clutch, and transmits driving force from the engine to the travel wheel
Data Source
AI summary
In this work vehicle, a control unit controls a shift in a speed gear of a transmission according to the vehicle velocity. The control unit determines whether or not the acceleration rate of the vehicle is equal to or less than a predetermined threshold when the vehicle velocity is within a predetermined first range. The control unit switches a lock-up clutch from a not-connected state to a connected state when the acceleration rate of the vehicle is equal to or less than the predetermined threshold. The control unit maintains the lock-up clutch in a not-connected state when the acceleration rate of the vehicle is greater than the predetermined threshold.