Electric Power Steering Assist Map Adjustment for Crosswind Stability
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Solution Overview
Problem
Crosswind disturbances cause deviations in a vehicle's steering angle and traveling direction, leading to increased driver fatigue due to the need for constant corrections, even with enhanced roll stiffness.
Innovation Solution
A vehicle traveling control system that includes an electric power steering device, a positioning device, and a communication device, which receives wind information and adjusts the assist force generation map to provide stronger assist force for steering against crosswind and maintain course stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If enhanced roll stiffness is applied to suppress vehicle shaking during crosswind, then vehicle stability is improved, but driver fatigue increases due to constant steering corrections required
Solution Approach 1:
The control unit receives wind information in advance and proactively changes the assist force generation map before the vehicle encounters significant crosswind effects. This preliminary adjustment of steering assist characteristics prepares the system to counteract crosswind disturbances, maintaining vehicle stability while reducing the steering effort required from the driver during crosswind conditions
2Ease of operation
If assist force is increased for steering against crosswind, then steering effort is reduced, but steering precision may be compromised
Solution Approach 1:
The control unit dynamically changes the assist force generation map based on real-time wind information and vehicle operating conditions. The assist force characteristics are adjusted according to steering angle, steering speed, and vehicle speed, providing optimized steering assistance that maintains both ease of operation and steering precision under varying crosswind conditions
Solution Approach 2:
The control unit modifies parameters in the assist force generation map, specifically adjusting the relationship between steering angle and assist force. By changing these parameters based on wind conditions, the system optimizes the balance between reducing steering effort and maintaining steering precision for accurate course correction
Data Source
AI summary
A vehicle traveling control system includes: an electric power steering device, a positioning device, a communication device, and a control unit. The communication device receives wind information including information on a wind direction and a detection position of crosswind detected on a course of a host vehicle. The crosswind blows from a side with respect to the host vehicle. The control unit changes an assist force generation map of the electric power steering device such that an assist force that the electric power steering device generates with respect to steering performed up the crosswind becomes stronger than an assist force that the electric power steering device generates with respect to steering performed down the crosswind during traveling of the host vehicle through the detection position of the crosswind.