Lean Vehicle Brake Control With Adaptive Front-Rear Force Distribution
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Solution Overview
Problem
Lean vehicles, such as motorcycles, face instability when emergency brake assist systems increase braking force automatically, leading to safety concerns due to their inherently unstable posture compared to four-wheeled vehicles.
Innovation Solution
A controller with a control section and a setting section that adjusts the braking force distribution between the front and rear wheels based on collision possibility and environmental sensor data, ensuring stable posture during emergency brake assist operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emergency brake assist increases braking force automatically, then collision avoidance capability is improved, but vehicle stability deteriorates
Solution Approach 1:
The braking force is segmented and distributed differently between front and rear wheels based on vehicle posture. The control device divides the total braking force into front wheel braking force and rear wheel braking force, with the rear wheel receiving reduced braking force when instability is detected, thereby preventing posture deterioration while maintaining collision avoidance capability
Solution Approach 2:
The braking force distribution is made dynamic and adaptive based on real-time vehicle posture detection. The control device continuously monitors vehicle posture and adjusts the rear wheel braking force accordingly - reducing it when posture becomes unstable and restoring it when stability is regained, enabling the system to adapt to changing conditions during emergency braking
2Speed
If braking force is increased for emergency stop, then stopping distance is reduced, but vehicle posture control becomes difficult
Solution Approach 1:
The control device implements feedback control by continuously detecting vehicle posture during emergency braking and using this information to adjust rear wheel braking force. When the posture detection indicates instability, the system automatically reduces rear wheel braking force to maintain posture control, and restores it when stability is achieved, creating a closed-loop control system
Data Source
AI summary
The present invention provides a controller and a control method that improve safety of a lean vehicle.The controller (60) has a control section (62) and a setting section (63). The control section (62) performs a brake control to increase a braking force of the lean vehicle (100) based on a collision possibility that is determined in response to an output result from an environment sensor (44). The setting section (63) sets a distribution of braking force between the braking force applied to a front wheel (3) and the braking force applied to a rear wheel (4) in the brake control. In the brake control, the control section (62) controls the braking force applied to the front wheel (3) and the braking force applied to the rear wheel (4) based on the distribution of braking force set by the setting section (63).