Vehicle Deviation Prevention Control Timing
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Solution Overview
Problem
Existing vehicle deviation prevention technologies often fail to generate sufficient lateral acceleration to prevent deviation from a travel road due to limitations in steering and brake control combinations, leading to inadequate deviation prevention control.
Innovation Solution
A traveling assistance apparatus that includes a travel road recognizing unit, a traveling state acquiring unit, a deviation determining unit, and a method determining unit, which determines the appropriate method for deviation prevention control by setting the duration and combination of steering and brake controls based on the vehicle's state and road conditions to ensure effective prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steering control and brake control are simultaneously performed based on a division ratio, then both controls are applied to the vehicle, but the lateral acceleration required to prevent deviation may not be generated due to deceleration from brake control
Solution Approach 1:
The patent applies preliminary action by performing steering control first to establish the necessary lateral acceleration, and then introducing brake control afterward. This sequencing ensures that the lateral acceleration component is generated before deceleration from braking reduces its effectiveness, thereby resolving the contradiction between simultaneous control application and sufficient lateral acceleration generation.
2Loss of time
If brake control is performed with high deceleration, then stopping distance is reduced, but lateral acceleration magnitude is reduced due to combined acceleration limitations
Solution Approach 1:
The patent performs steering control as a preliminary action before applying brake control. This ensures that the lateral acceleration necessary for deviation prevention is established first, and then braking is applied to reduce stopping distance. The sequential application resolves the contradiction by ensuring lateral acceleration is not compromised by simultaneous high-deceleration braking.
Data Source
AI summary
A traveling assistance apparatus recognizes a travel road on which a vehicle is traveling, acquires a traveling state of the vehicle, and determines whether or not the vehicle will deviate from the travel road based on the recognition result of the travel road and the traveling state of the vehicle. The apparatus determines whether to perform, as a prevention method for preventing from the travel road, a method in which either of steering control and brake control of the vehicle is performed, or a method in which a period over which either of the steering control and the brake control is performed and a period over which both of the steering control and the brake control are performed are set. The apparatus sets a steering amount for the steering control and a brake amount for the brake control when the deviation prevention control is performed based on the prevention method.