EV Driving-Force Maps for Forward and Reverse Rough-Road Traction
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Solution Overview
Problem
Existing electric vehicles lack effective traveling modes for enhancing rough-road capability in both forward and backward directions, resulting in inadequate performance on rough surfaces like snow or mud when switching between the two.
Innovation Solution
An electric vehicle with a vehicle controller that switches between a first and a second traveling mode, applying a gentler driving-force map to backward traveling in the second mode to match the sharper map applied to forward traveling, ensuring improved traction and control in both directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single driving-force map is applied to both forward and backward traveling in rough-road mode, then the vehicle structure is simplified, but the traveling characteristics on rough roads are insufficient in backward direction
Solution Approach 1:
The patent applies different driving-force map characteristics to different traveling directions. Specifically, backward traveling uses a driving-force map with gentler characteristics while forward traveling uses a map with sharper characteristics, optimizing performance for each direction's specific requirements on rough roads.
Solution Approach 2:
The vehicle controller dynamically switches between different driving-force map characteristics based on the traveling direction. When backward traveling is detected in rough-road mode, the controller selects the gentler map; when forward traveling is detected, it selects the sharper map, making the system adaptive to operational conditions.
2Ease of operation
If a gentler driving-force map is applied to backward traveling, then the accelerator operation becomes more manageable and visibility issues are compensated, but the power response is reduced compared to forward traveling
Solution Approach 1:
The patent changes the parameters of the driving-force map based on traveling direction. For backward traveling, the driving-force map is configured with gentler characteristics, adjusting the relationship between accelerator operation and power output to improve controllability and compensate for impaired visibility during reverse operation on rough surfaces.
Data Source
AI summary
An electric vehicle includes a vehicle controller. The vehicle controller is capable of switching a traveling mode of the electric vehicle between a first traveling mode and a second traveling mode that applies driving-force maps for enhancing a rough-road capability from a rough-road capability in the first traveling mode. The vehicle controller is capable of switching the traveling mode to the second traveling mode in forward traveling and in backward traveling and is configured to apply, to the backward traveling in the second traveling mode, a first driving-force map of the driving-force maps, the first driving-force map having gentler characteristics than a second driving-force map of the driving-force map applied to the forward traveling in the second traveling mode.