Adaptive Deceleration Limit for Cruise Control
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Solution Overview
Problem
Existing drive assisting devices, such as Adaptive Cruise Control systems, do not effectively reduce driver dependence on automatic braking, as they maintain inter-vehicle distance control until the host vehicle reaches a low speed, limiting the driver's ability to handle sudden slowdowns by the preceding vehicle.
Innovation Solution
A drive assisting device with a detection unit, vehicle control unit, and operation amount changing means that reduces the amount of operation, such as braking force, when the operation exceeds a predetermined value, and includes restoration means to return the operation to its original state, thereby reducing driver dependence while ensuring safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive assisting device maintains inter-vehicle distance control until low speed, then safety is improved, but driver dependence on automatic braking increases
Solution Approach 1:
The patent applies dynamics by making the upper limit of deceleration adjustable rather than fixed. The control unit dynamically changes the deceleration limit based on detected driving situations, allowing the system to provide strong braking when safe (reducing driver dependence) while maintaining safety constraints when necessary. This resolves the contradiction by making the system adaptive to different operational contexts.
Solution Approach 2:
The patent changes the parameter of deceleration upper limit based on detected situations. When the situation is determined as safe for strong braking, the upper limit is increased, allowing the driver to rely on automatic braking. When safety concerns arise, the limit is reduced. This parameter adjustment strategy enables the system to maintain safety while reducing driver dependence appropriately.
2Ease of operation
If the upper limit of deceleration is eased to reduce driver dependence, then ease of operation is improved, but safety may be compromised
Solution Approach 1:
The patent implements feedback by continuously detecting the driving situation and using this information to adjust the deceleration upper limit. The detection unit monitors conditions, and the control unit responds by appropriately setting the deceleration limit. This closed-loop feedback mechanism ensures that ease of operation (reduced driver dependence) is achieved only when safety conditions are met, resolving the contradiction between these two factors.
Solution Approach 2:
The system dynamically adjusts the deceleration limit based on real-time situation detection rather than using a fixed value. This dynamic adaptation allows the system to provide strong braking (reducing driver dependence) when the situation permits while automatically reducing the limit when safety becomes a concern, thus resolving the contradiction between ease of operation and safety.
3Speed
If the drive assisting device provides strong braking force, then responsiveness is improved, but driver dependence increases
Solution Approach 1:
The patent changes the deceleration parameter (upper limit) based on detected situations to achieve appropriate responsiveness. When situations allow, the deceleration limit is increased to provide strong, responsive braking that reduces driver dependence. When situations require caution, the limit is reduced. This parameter adaptation resolves the contradiction by making responsiveness context-dependent.
Solution Approach 2:
The system dynamically adjusts braking force characteristics based on real-time situation detection. Rather than providing consistently strong braking that would increase driver dependence, the system adapts its responsiveness to match safety requirements, providing strong braking only when appropriate. This dynamic behavior resolves the contradiction between responsiveness and driver dependence.
Data Source
AI summary
A radar sensor detects a traveling state of a host vehicle. An inter-vehicle control ECU gives the amount of operation for the predetermined amount of control of the host vehicle so that the traveling state of the host vehicle detected by the radar sensor becomes a predetermined state. The amount of operation given by the inter-vehicle control ECU is reduced as a kind of restriction when the amount of operation given by the inter-vehicle control ECU becomes equal to or larger than a predetermined value. As a result, it is possible to reduce the dependence of the driver on the device.