Lean Vehicle Rear-Wheel Slip Control for Rider-Requested Slides
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Solution Overview
Problem
Existing controllers for lean vehicles face challenges in balancing the need for safety and freedom of driving, as anti-lock braking operations tend to reduce lateral grip force, making intended slide travel difficult for riders.
Innovation Solution
A controller that implements a slide control mode by setting a higher slip degree target for the rear wheel during slide requests, allowing for controlled slip and maintaining lateral grip force, thereby enabling both safety and driving freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anti-lock braking operation is performed to suppress wheel locking, then safety is improved, but lateral grip force is reduced making slide travel difficult
Solution Approach 1:
The controller dynamically switches between normal control mode and slide control mode based on rider input detection. In normal mode, anti-lock braking maintains safety by controlling slip degree to a standard target. When slide request is detected, the system transitions to slide control mode where the slip degree target is increased, allowing the rear wheel to slip sideways while still maintaining controlled anti-lock braking functionality.
Solution Approach 2:
The invention changes the slip degree target parameter based on operating conditions. In normal operation, the slip degree target is set to a lower value for safety. When slide travel is requested, the slip degree target is increased to allow greater slip, which reduces lateral grip force constraints and enables the rider to perform slide maneuvers while still benefiting from controlled anti-lock braking.
2Reliability
If slip degree is controlled to a low target for safety, then wheel locking is suppressed, but lateral grip force is excessively reduced
Solution Approach 1:
The system dynamically adjusts the slip degree target based on detected rider intent. During normal braking, a lower slip degree target maintains strong lateral grip for safety. When slide travel is requested through rider input, the system transitions to a higher slip degree target, allowing controlled reduction of lateral grip force while maintaining wheel locking suppression through continued anti-lock braking control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The controller effectively suppresses excessive lateral grip force during slide travel, allowing riders to achieve intended slide maneuvers while ensuring safety and freedom of driving.
Implementation Method 1
the anti-lock braking operation for suppressing locking of a rear wheel by increasing/reducing a braking force or drive power of the rear wheel of the lean vehicle and thereby controlling a slip degree of the rear wheel
Data Source
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AI summary
The present invention obtains a controller and a control method capable of simultaneously achieving freedom of driving and safety of a lean vehicle. In a controller (60) and the control method according to the present invention, a control section of the controller (60) can execute anti-lock braking operation for suppressing locking of a rear wheel (4) by increasing/reducing a braking force or drive power of the rear wheel (4) of a lean vehicle (100) and thereby controlling a slip degree of the rear wheel (4) to a slip degree target, and in the case where a slide request, which is a request by a rider to make the lean vehicle (100) slide, is present, implements a slide control mode in which the anti-lock braking operation is performed by setting the slip degree target to be higher than that of a case where the slide request is absent.