Motorcycle Emergency Deceleration Control for Stable Brake Force Transfer
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Solution Overview
Problem
Straddle-type vehicles, such as motorcycles, exhibit unstable posture and unintended behavior during automatic emergency deceleration due to the uneven braking force distribution between front and rear wheels, which affects rider comfort and braking efficiency.
Innovation Solution
A controller that initiates automatic emergency deceleration by distributing braking force initially on the front wheel and gradually increasing the rear wheel's share, preventing force buildup in the front wheel brake mechanism, which is more favorable for braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic emergency deceleration operation is executed with conventional braking force distribution, then braking efficiency is improved, but rider comfort deteriorates due to unstable posture and unintended vehicle behavior
Solution Approach 1:
The patent applies dynamics by making the braking force distribution adjustable and time-dependent. The controller dynamically changes the braking force distribution from an initial state (where front wheel braking dominates) to a subsequent state (where rear wheel braking dominates) during the automatic emergency deceleration operation. This dynamic adjustment resolves the contradiction by optimizing braking efficiency at the start while ensuring rider comfort as the operation progresses.
2Ease of operation
If braking force is applied only to the rear wheel to improve rider comfort, then rider comfort is improved, but braking efficiency deteriorates due to underutilization of the front-wheel brake mechanism
Solution Approach 1:
The patent applies preliminary action by applying braking force to the front wheel at the initial stage of automatic emergency deceleration operation before the vehicle posture becomes unstable. This preliminary front-wheel braking utilizes the superior braking capability of the front-wheel brake mechanism while the vehicle is still in a stable state, thereby improving braking efficiency without compromising rider comfort in the subsequent phase.
Data Source
AI summary
The present invention obtains a controller and a control method capable of appropriately executing automatic emergency deceleration operation of a straddle-type vehicle.In the controller according to the present invention, when the automatic emergency deceleration operation of the straddle-type vehicle is executed, at a braking start time point at which a braking force starts being generated on at least one of wheels, braking force distribution between the front and rear wheels is brought into an initial state where the braking force is generated on the front wheel. In the control method according to the present invention, when the automatic emergency deceleration operation of the straddle-type vehicle is executed, at the braking start time point at which the braking force starts being generated on at least one of the wheels, the braking force distribution between the front and rear wheels is brought into the initial state where the braking force is generated on the front wheel.