Adaptive Inter-Vehicle Distance Control for Turning Vehicles
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Solution Overview
Problem
Conventional vehicle running control systems apply excessive brake control when a preceding vehicle makes a right or left turn, leading to early braking and discomfort for the driver, and struggle to meet the driver's desire for deceleration, especially when the preceding vehicle stops or slows down during a turn.
Innovation Solution
A vehicle running control system that uses a front-environment recognition device to detect the preceding vehicle's turn and adjusts the target inter-vehicle distance by setting a shorter distance when a turn is detected, allowing for smoother and more driver-desired control by delaying brake application and applying appropriate brake force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the target inter-vehicle distance is set based on the vehicle speed detected in the traveling direction of the subject vehicle, then the brake control can be performed according to the inter-vehicle distance and relative speed, but the braking is performed earlier than the driver recognizes the right/left turn and presses the brake pedal, causing discomfort
Solution Approach 1:
The patent changes the parameter used for brake control from the vehicle speed in the traveling direction (which causes early braking during turns) to the speed in the traveling direction of the preceding vehicle. This parameter change resolves the contradiction by aligning the control system's braking timing with the driver's expected braking timing, eliminating discomfort while maintaining control accuracy
Solution Approach 2:
The patent introduces feedback by detecting whether the preceding vehicle is making a right/left turn and adjusting the target inter-vehicle distance accordingly. When a turn is detected, the system sets a shorter target distance, which delays brake application until it matches the driver's intended timing, thus resolving the contradiction between control accuracy and driver comfort
2Reliability
If the target inter-vehicle distance is set based on the vehicle speed in the traveling direction, then the brake control responds to the preceding vehicle's turn, but an excessive brake force is applied
Solution Approach 1:
The patent changes the speed parameter from the subject vehicle's traveling direction to the preceding vehicle's traveling direction, and simultaneously changes the target inter-vehicle distance parameter to be shorter during turns. This combination resolves the contradiction by reducing the brake force applied during turns to match the driver's expected deceleration level
Solution Approach 2:
The patent makes the target inter-vehicle distance dynamic by adjusting it based on the preceding vehicle's motion state. When a right/left turn is detected, the target distance is set to a shorter value, which dynamically adjusts the brake force to be appropriate for the turning scenario rather than applying excessive force
Data Source
AI summary
At least a follow-up target inter-vehicle distance is set on the basis of information about a preceding vehicle recognized by a forward-environment recognition device mounted in a subject vehicle and including a stereo camera, and it is determined whether or not the preceding vehicle is making a right/left turn. When a right/left turn of the preceding vehicle is detected, the follow-up target inter-vehicle distance is multiplied by a correction coefficient so as to set a different follow-up target inter-vehicle distance for the right/left turn.