Dual-Speed Final Drive Ratio Control for Road Gradient Adaptation
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Solution Overview
Problem
Traditional dual-speed final drives have a fixed gear ratio matching, which is not suitable for changing road conditions and terrain, leading to suboptimal vehicle performance and energy efficiency.
Innovation Solution
A method and device that dynamically adjust the final drive ratio based on predicted road gradients using electronic horizon data, switching to a higher ratio for uphill sections and a lower ratio for downhill sections to optimize power performance and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed final drive ratio matching is used, then the transmission size is reduced and arrangement is facilitated, but the vehicle cannot adapt to changing road conditions and terrain
Solution Approach 1:
The patent applies the dynamics principle by implementing a dual-speed final drive that can dynamically switch between two different final drive ratios (first and second ratios) based on detected driving conditions. The control unit switches ratios in response to acceleration requests, deceleration requests, or manual driver input, transforming a static system into an adaptive one that optimizes performance for varying road conditions and terrain without requiring complex mechanical structures.
2Power
If a higher final drive ratio is used for power performance, then uphill capability is improved, but energy consumption increases
Solution Approach 1:
The system dynamically selects between a higher final drive ratio (first ratio) for power-intensive situations like uphill driving and a lower final drive ratio (second ratio) for energy-efficient cruising. The control unit monitors driving conditions and switches ratios based on acceleration requests, deceleration requests, or manual input, optimizing the balance between power performance and energy consumption in real-time.
Solution Approach 2:
The patent changes the final drive ratio parameter from a fixed value to a variable that can switch between two discrete values (first and second ratios). This parameter change allows the system to optimize power transmission characteristics for different driving scenarios, selecting the higher ratio when power performance is needed and the lower ratio when energy efficiency is prioritized.
3Use of energy by moving object
If a lower final drive ratio is used for energy economy, then fuel efficiency is improved, but power performance deteriorates
Solution Approach 1:
The system dynamically selects between a lower final drive ratio (second ratio) for energy-efficient cruising and a higher final drive ratio (first ratio) for power-intensive situations. The control unit monitors driving conditions and switches ratios based on acceleration requests, deceleration requests, or manual input, optimizing the balance between energy economy and power performance in real-time.
Data Source
AI summary
The disclosure relates to a dual-speed final drive control method and terminal device, and a storage medium. The method includes: when an absolute value of a gradient value of a road ahead is greater than a gradient threshold, determining, according to the gradient value, whether the road ahead is an uphill section or a downhill section, thereby controlling all gears of a transmission to correspond to a higher final drive ratio or a lower final drive ratio in the dual-speed final drive. The disclosure can make use of the dual-speed-ratio final drive to the greatest extent to improve the economy in energy consumption of the entire vehicle.