Work Vehicle Load Control via Adaptive Speed Change Positioning
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Solution Overview
Problem
Conventional load control mechanisms for work vehicles struggle to effectively manage different engine loads under varying operating conditions, leading to unsatisfactory performance and potential engine stalls.
Innovation Solution
A load control structure for work vehicles that includes set and actual rotation speed detection, a continuously variable speed change device, and a control system that calculates the drop in engine rotation speed and sets a limit operation position based on correlation data, allowing for precise control of the speed change device to manage engine load effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the continuously variable speed change device is operated to a speed position based solely on the drop amount from set engine rotation speed, then the control mechanism is simple, but the load control performance is insufficient for different engine loads under varying operating conditions
Solution Approach 1:
The patent applies dynamics by making the control parameters adaptive rather than fixed. The control means dynamically adjusts the limit operation position based on actual operating conditions (engine rotation speed, vehicle speed, accelerator opening degree) and selects from multiple correlation data sets. This allows the load control to adapt to different engine loads and operating conditions, resolving the contradiction between simple control structure and effective load management across varying conditions.
Solution Approach 2:
The patent changes parameters by introducing multiple correlation data sets that correlate engine rotation speeds with operating positions under different operating conditions. The control means selects appropriate correlation data based on current conditions and adjusts the limit operation position accordingly. This parameter adaptation enables effective load control for different engine loads without requiring a fundamentally complex control architecture.
2Adaptability or versatility
If the control means uses multiple correlation data and selects based on operating conditions, then the load control adapts to different engine loads, but the control system complexity increases
Solution Approach 1:
The patent applies universality by designing a control means that handles multiple functions within a single system. The same control means detects operating conditions, selects appropriate correlation data sets, calculates limit operation positions, and controls the continuously variable speed change device. This multi-functional approach enables adaptability to different engine loads without proportionally increasing system complexity, as one control unit performs multiple tasks.
Solution Approach 2:
The patent applies preliminary action by pre-preparing multiple correlation data sets that correlate engine rotation speeds with operating positions under different operating conditions. These data sets are stored in advance in the control means, allowing rapid selection and application based on current conditions without requiring complex real-time calculations or adaptations, thus reducing control system complexity while maintaining adaptability.
3Measurement precision
If the limit operation position is calculated based on drop amount and correlation data, then the speed control precision is improved, but the calculation and control complexity increases
Solution Approach 1:
The patent applies copying by using pre-established correlation data sets that represent the relationship between engine rotation speeds and operating positions under different conditions. Instead of developing complex real-time models, the control means copies from these pre-prepared data sets to determine the limit operation position. This approach achieves precise speed control while keeping the calculation and control complexity manageable through lookup-based methods rather than complex computations.
Data Source
AI summary
A load control system for a work vehicle including set rotation speed detection means for detecting a set rotation speed of an engine of the work vehicle, actual rotation speed detection means that senses an actual rotation speed of the engine, a continuously variable speed change device that receives power from the engine of the work vehicle, speed change position detecting means for detecting a speed change operating position of the continuously variable speed change device, operating means for speed-shifting the continuously variable speed change device, and control means for controlling the operation of the operating means.