Vehicle Deviation Avoidance Notification Timing
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Solution Overview
Problem
Existing vehicle deviation avoidance systems notify passengers of deviation avoidance before the steering torque is applied, leading to a delay due to structural play and frictional forces, causing discomfort as the actual traveling condition differs significantly from the notified condition.
Innovation Solution
A deviation avoidance apparatus that includes a boundary detection section, deviation prediction section, deviation avoidance section, and notification section, which notifies passengers only when the steering actuator applies driving force to the steering mechanism, reducing the timing difference between notification and actual actuation by using a pre-torque mechanism to adjust the steering angle optimally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If notification is provided before the electric motor outputs steering torque, then passengers are informed in advance of deviation avoidance, but a significant difference occurs between actual traveling condition and notified condition due to structural play and frictional force delays
Solution Approach 1:
The notification is triggered by preliminary actions (detecting deviation and calculating steering torque waveform) before the actual steering torque is applied. This allows the system to inform passengers in advance while maintaining accuracy by basing the notification on the predicted steering action rather than waiting for mechanical response.
Solution Approach 2:
The system continuously monitors the actual steering angle and compares it with the target steering angle, using this feedback to adjust the notification timing and content. This ensures that notifications remain accurate despite delays caused by structural play and frictional forces in the steering mechanism.
2Ease of manufacture
If the electric motor and steering mechanism are designed with standard structural components, then manufacturing and maintenance are simplified, but structural play and frictional force delay the actual actuation of steering torque
Solution Approach 1:
The system applies preliminary steering torque to overcome static friction and structural play before the main steering action. This pre-torque phase prepares the steering mechanism for rapid response without requiring special high-performance components, thus maintaining ease of manufacture while improving response speed.
Solution Approach 2:
The steering control system dynamically adjusts the torque waveform to compensate for structural play and frictional forces. By varying the torque application in real-time based on detected conditions, the system achieves faster effective response without changing the physical structure of the steering mechanism.
Data Source
AI summary
A deviation avoidance apparatus of an embodiment includes a boundary detection section that detects boundaries of a travelling path on which an own vehicle travels; a deviation prediction section that predicts that the own vehicle will deviate from the travelling path based on a travelling condition of the own vehicle that travels in the travelling path defined by the boundaries detected by the boundary detection section; a deviation avoidance section that commands, when the deviation prediction section predicts that the own vehicle will deviate from the travelling path, a steering control unit to have a steering actuator drive a steering mechanism that changes a traveling direction of the own vehicle such that the own vehicle avoids deviating from the travelling path; and a notification section that notifies vehicle passengers, via a notification unit, when the steering actuator applies driving force to the steering mechanism such that the own vehicle avoids deviating from the travelling path, that deviation avoidance of the own vehicle is ongoing.