Drive Control System for Electric Vehicle with Dynamic Recuperation
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Solution Overview
Problem
Electric vehicles with one-pedal feeling systems face challenges in providing a comfortable driving experience, as they require continuous accelerator pedal engagement to prevent intense deceleration, and users need to adapt to using the brake pedal, which can be tiring, especially on long freeway drives.
Innovation Solution
A drive control system with an additional drive position 'i' that combines electric vehicle one-pedal feeling with internal combustion engine driving modes, featuring a high, non-freely selectable recuperation level and automatic hold function to prevent rolling, allowing drivers to choose between drive positions for optimal driving characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If one-pedal feeling system with high recuperation level is used, then energy recovery is improved, but driving comfort deteriorates due to intense deceleration requiring continuous accelerator pedal engagement
Solution Approach 1:
The system dynamically adjusts the recuperation level based on the selected drive position. In drive position 'D', a lower recuperation level is applied for comfortable city driving, while in drive position 'I' (insert), a higher recuperation level is applied for energy-efficient freeway driving. This dynamic adaptation resolves the contradiction by providing different recuperation characteristics for different driving scenarios.
Solution Approach 2:
The invention changes the recuperation parameter (deceleration level) based on the drive position selector setting. By offering multiple predefinable recuperation levels and allowing selection between different drive positions, the system enables parameter optimization for specific driving conditions, thereby improving both energy recovery and driving comfort depending on the selected mode.
2Reliability
If high recuperation level is applied to prevent rolling at standstill, then vehicle holding is improved, but ease of operation deteriorates as driver must continuously monitor and adjust accelerator pedal
Solution Approach 1:
The system provides automatic vehicle holding through the Auto-H function and standstill management that automatically engages when the vehicle comes to a stop in drive position 'I'. The holding function operates autonomously without requiring continuous driver input, and the system automatically manages the transition between holding and driving states, thereby improving operational simplicity while maintaining reliable vehicle holding.
3Adaptability or versatility
If additional drive position with multiple functions is added, then adaptability is improved, but device complexity increases
Solution Approach 1:
The additional drive position 'I' (insert) serves multiple functions: it enables high recuperation level for energy recovery, activates automatic vehicle holding to prevent rolling, and provides a simplified operating mode for freeway driving. By consolidating these multiple functions into a single drive position, the system achieves high adaptability without proportionally increasing device complexity.
Solution Approach 2:
The control system segments driving scenarios into distinct drive positions ('D' for city driving, 'I' for freeway driving). Each drive position is associated with specific predefinable recuperation levels and holding function behaviors. This segmentation allows the complex system to manage multiple functions through clear, separated operational modes, making the complexity more manageable and understandable.
Data Source
AI summary
A drive control system for a motor vehicle operated by electric motor has a drive position selector device and an electronic control unit which is connected to the drive position selector. The drive control system is configured in such a way that when a first alternative automatic drive position is selected a comparatively high, not freely selectable recuperation level can be predefined and crawl mode is deactivated, and when a second alternative automatic drive position is selected at least one constant recuperation level or a sailing mode can be predefined and crawl mode is activated.