Motorcycle ACC Braking Distribution for Posture Stability
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Solution Overview
Problem
Straddle-type vehicles, such as motorcycles, experience unstable posture and reduced braking efficiency during adaptive cruise control due to automatic braking, which can worsen rider comfort and safety.
Innovation Solution
A controller that dynamically adjusts the braking force distribution between the front and rear wheels, initially favoring the front wheel during braking initiation and increasing the rear wheel's distribution ratio if the rider's posture is deemed inappropriate, thereby preventing front wheel brake mechanism overload and reducing the risk of tilting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic braking force is exerted on the straddle-type vehicle during adaptive cruise control, then the vehicle can maintain safe following distance and speed control, but the vehicle exhibits unintended behavior and unstable posture that worsens rider comfort
Solution Approach 1:
The patent applies local quality by differentiating braking force distribution based on rider posture conditions. When rider posture is appropriate, braking force is distributed to both front and rear wheels; when rider posture is inappropriate, braking force is applied only to the rear wheel. This localized adjustment of braking characteristics resolves the contradiction by maintaining ADC functionality while adapting to rider comfort needs.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting the braking force distribution ratio between front and rear wheels based on real-time rider posture detection. The control device continuously monitors rider posture and modifies braking characteristics during ADC operation, transforming the static braking system into a dynamic one that adapts to changing conditions to maintain both safety and comfort.
2Ease of operation
If braking force is applied only to the rear wheel to improve rider comfort, then rider comfort improves, but braking efficiency worsens due to force remaining in the front-wheel brake mechanism
Solution Approach 1:
The patent uses dynamics to switch braking force distribution modes based on rider posture. During initial braking or when posture is inappropriate, the system applies braking force only to the rear wheel to improve comfort. When posture becomes appropriate or for enhanced stopping power, the system transitions to distributing braking force to both wheels, thereby optimizing braking efficiency while maintaining comfort considerations.
Solution Approach 2:
The patent applies parameter changes by modifying the braking force distribution ratio as a controllable parameter. The control device adjusts this parameter based on rider posture detection, changing it from a fixed value to a variable that optimizes both comfort and braking efficiency depending on the operational context.
3Productivity
If the front wheel brake mechanism is used for braking, then braking efficiency is improved, but the vehicle may tilt forward unexpectedly during deceleration when rider posture is inappropriate
Solution Approach 1:
The patent applies local quality by selectively applying braking force to different wheels based on rider posture conditions. When rider posture is inappropriate, braking force is applied only to the rear wheel to prevent forward tilting. When posture is appropriate, braking force can be distributed to both wheels for optimal efficiency. This localized control resolves the contradiction between braking efficiency and posture stability.
Solution Approach 2:
The patent implements preliminary anti-action by detecting rider posture in advance and preventing forward tilting before it occurs. The control device monitors rider posture and, upon detecting an inappropriate posture, proactively adjusts braking force distribution to avoid the harmful effect of forward tilting, rather than reacting after the tilting has already occurred.
Data Source
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AI summary
The present invention obtains a controller and a control method capable of appropriately executing adaptive cruise control of a straddle-type vehicle. In the controller and the control method according to the present invention, when braking forces are generated on at least one of wheels of the straddle-type vehicle during the adaptive cruise control, in which the straddle-type vehicle is made to travel according to a distance from the straddle-type vehicle to a preceding vehicle, motion of the straddle-type vehicle, and a rider's instruction, at a braking start time point at which the braking force starts being generated on at least one of the wheels, braking force distribution between the front and the rear wheel is brought into an initial state where the braking force is generated on the front wheel.