Autofunction Control System for Dynamic Transmission Ratio Adjustment
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Solution Overview
Problem
Existing automatic transmission systems for motor vehicles, particularly in agricultural tractors, face issues with adaptability to varying driving and environmental conditions, leading to poor reactivity, instability in gear ratios, and reduced power performance.
Innovation Solution
An autofunction control system that continuously adjusts transmission ratios for continuously variable transmissions or discrete-ratio transmissions, using a strategy that includes 'anti-droop', 'go to max rate', and 'dynamic rate' contributions to maintain optimal engine power and prevent engine droop, while allowing for operator-driven power adjustments through the accelerator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed thresholds are used for transmission control, then the system structure is simple, but the adaptability to varying driving and environmental conditions deteriorates
Solution Approach 1:
The patent implements dynamic transmission ratio adjustment where the control system continuously monitors driving conditions (accelerator position, engine load, vehicle speed) and automatically modifies transmission ratios in real-time. This replaces fixed threshold control with adaptive dynamic control that responds to changing operational conditions, resolving the contradiction between simple structure and adaptability.
Solution Approach 2:
The system changes control parameters (transmission ratios, power distribution) based on detected driving conditions. By continuously adjusting these parameters according to accelerator position, engine load, and vehicle speed, the system achieves high adaptability while maintaining a relatively simple control architecture through parameter-based adaptation rather than complex structural changes.
2Adaptability or versatility
If continuous adjustment of transmission ratio is implemented, then the adaptability to driving conditions is improved, but the device complexity increases
Solution Approach 1:
The control system is designed to perform multiple functions: monitoring accelerator position, determining engine load, selecting appropriate transmission ratios, and managing power distribution. By creating a universal control unit that handles all these functions, the system achieves high reactivity without proportionally increasing overall device complexity, as a single multi-functional controller replaces what would otherwise require multiple separate systems.
Solution Approach 2:
The system automatically determines optimal transmission ratios and power distribution based on sensor inputs without requiring manual intervention. The control unit self-adjusts transmission ratios according to detected conditions, providing autonomous operation that improves reactivity while keeping the control architecture manageable through self-service capabilities.
3Power
If the system prioritizes maximum power delivery, then the power performance is improved, but the stability of transmission ratio control deteriorates
Solution Approach 1:
The system dynamically changes transmission ratio parameters based on detected driving conditions and operator intent (accelerator position). By continuously adjusting these parameters to match actual operational requirements, the system delivers maximum appropriate power while maintaining stable control through condition-based adaptation rather than fixed aggressive power delivery.
Solution Approach 2:
The control system continuously monitors driving conditions, engine load, and vehicle speed, using this feedback to automatically adjust transmission ratios. This closed-loop feedback mechanism ensures stable transmission ratio control by responding to actual operational conditions, while simultaneously optimizing power delivery based on real-time system state and operator demands.
Data Source
AI summary
An autofunction control system for motor vehicles comprising an engine, a transmission and an accelerator, the position of the accelerator defining a set ERPM, the system configured to define a desired percentage of maximum available power for each set ERPM, the system configured to control the transmission ratio of the transmission to load the engine at least to the desired percentage of power, wherein the desired percentage of power is a function of the set ERPM when the set ERPM is between a low threshold and a high threshold, and wherein the system is configured to control the transmission ratio to load the engine closest to the maximum available absolute power for the engine for a set ERPM above the high threshold ERPM.