CVT Powertrain Rotation Detector Logic for Work Vehicle Shift Control
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Solution Overview
Problem
Conventional continuously variable powertrain devices for work vehicles face challenges in accurately and promptly determining abnormality in duplicated rotation detectors, which are crucial for stepless shift control, leading to inefficiencies and potential safety issues due to the complexity of detecting output rotation speeds from multiple sensors.
Innovation Solution
A powertrain device with a rotation detector group and a powertrain controller that utilizes multiple rotation detectors to detect engine, continuously variable, and travel rotation speeds, applying abnormality determination rules based on the operation conditions of the planetary clutch mechanism and forward-reverse direction switch to determine the state of the detectors, enabling accurate and prompt identification of abnormalities and implementing appropriate countermeasures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple rotation detectors are duplicated to ensure fail-safe operation, then reliability is improved, but device complexity increases
Solution Approach 1:
The system continuously monitors detection signals from multiple rotation detectors and compares them against expected relationships. When discrepancies are detected, the system provides feedback to determine abnormality and triggers appropriate responses, ensuring reliable operation while managing complexity through intelligent signal processing
Solution Approach 2:
The abnormality determination unit acts as an intermediary that receives signals from multiple detectors and processes them to determine system state. This intermediary component manages the complexity by centralizing the analysis logic and providing a clear decision mechanism for detector abnormality
2Measurement precision
If multiple rotation detectors are used to detect rotation speeds, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The detection system is segmented into multiple specialized detectors, each monitoring specific rotation speeds (engine, continuously variable transmission, planetary transmission). This segmentation improves measurement precision for each parameter while organizing complexity into manageable, functionally distinct components
Solution Approach 2:
The multiple rotation detectors serve dual purposes: they provide redundant measurement for reliability and enable precise rotation speed detection for control operations. This multi-functionality justifies the added complexity by delivering both precision and reliability from the same detector network
3Ease of operation
If abnormality determination rules are applied based on operation conditions, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The abnormality determination system dynamically adapts its analysis based on current operation conditions of the planetary clutch mechanism and forward-reverse direction switch. This dynamic approach simplifies operation by automatically adjusting detection criteria without requiring manual intervention, while the control logic complexity is managed through condition-based decision trees
Data Source
AI summary
A continuously variable powertrain device for a work vehicle includes a continuously variable transmission to output a continuously shifted motive power while continuously varying a speed of a motive power received from an engine, a planetary transmission to receive the motive power from the engine and the continuously shifted motive power and to output a compound motive power, a planetary clutch to switch a shift level of the planetary transmission a forward-reverse direction switch to receive the compound motive power and to output either a forward motive power or a reverse motive power, rotation detectors, and a powertrain controller.