Motorcycle ACC Brake Control With Front-First Force Distribution
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Solution Overview
Problem
Straddle-type vehicles, such as motorcycles, experience unstable posture and reduced comfort during adaptive cruise control due to automatic braking, which can worsen the rider's experience and braking efficiency, as the front-wheel brake mechanism is more favorable than the rear-wheel brake mechanism.
Innovation Solution
A controller that initiates adaptive cruise control by distributing braking force initially to the front wheel and then gradually increases the rear wheel's share, preventing force buildup in the front-wheel brake mechanism and stabilizing the vehicle's posture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If braking force is applied to the rear wheel only to improve rider comfort, then rider comfort is improved, but braking efficiency deteriorates
Solution Approach 1:
The brake control section dynamically adjusts the braking force distribution between front and rear wheels based on the braking phase. During the initial phase, braking force is applied only to the rear wheel to improve comfort. After a predetermined time elapses, the system transitions to applying braking force to both wheels, maximizing braking efficiency. This dynamic adjustment resolves the contradiction between comfort and efficiency.
2Productivity
If braking force is distributed to both wheels simultaneously, then braking efficiency is improved, but vehicle stability deteriorates due to unintended behavior
Solution Approach 1:
The system performs preliminary braking action on the rear wheel alone before engaging the front wheel brake. This preliminary phase lasts for a predetermined time period, allowing the vehicle to stabilize under rear-wheel braking conditions before the more aggressive dual-wheel braking is applied, thus preventing unintended vehicle behavior.
Solution Approach 2:
The braking process is divided into distinct time periods: an initial period where only rear wheel braking is applied, followed by a subsequent period where both wheels are braked. This periodic action pattern ensures stability during the transition while maintaining overall braking effectiveness.
3Productivity
If front-wheel brake mechanism is used, then braking efficiency is improved, but force buildup in brake mechanism causes instability
Solution Approach 1:
The rear wheel brake is activated in advance before the front wheel brake during the initial braking phase. This preliminary action prevents sudden force buildup in the front-wheel brake mechanism, allowing the braking system to engage gradually and maintain vehicle stability while still achieving effective braking.
Data Source
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.