Braking system

The braking system addresses the challenge of maintaining stability during vehicle braking by dynamically controlling the distribution of braking forces between the front and rear wheels, using a pressure regulating unit, a rear wheel fluid pressure adjusting unit, and a control device to manage the regenerative and friction braking forces.

WO2025070659A1 Publication Date: 2025-04-03ADVICS CO LTD
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Patent Information

Application Number
PCT/JP2024/034520
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-29
Filing Date
2024-09-26
Publication Date
2025-04-03

AI Technical Summary

Technical Problem

Existing braking systems for vehicles equipped with regenerative devices struggle to maintain stability during braking, especially when regenerative braking force is applied to the rear wheels.

Method used

A braking system that includes a pressure regulating unit, a rear wheel fluid pressure adjusting unit, and a control device. The control device manages the regenerative device, pressure regulating unit, and rear wheel fluid pressure adjusting unit to ensure that the rear wheels receive a regenerative braking force and a friction braking force, while adjusting the hydraulic pressures to maintain stability during braking.

Benefits of technology

The system effectively reduces vehicle braking force while maintaining stability, even when regenerative braking force is applied to the rear wheels, by dynamically controlling the distribution of braking forces between the front and rear wheels.

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Abstract

A braking system 20 comprises: a pressure adjustment unit 50 that generates a reference hydraulic pressure and also generates a front wheel hydraulic pressure according to the reference hydraulic pressure; a rear wheel hydraulic pressure adjustment unit 74 that is configured to allow a rear wheel hydraulic pressure to be less than the front wheel hydraulic pressure when the reference hydraulic pressure is being generated; and a control device 80 that controls a regeneration device 90, the pressure adjustment unit 50, and the rear wheel hydraulic pressure adjustment unit 74. The control device 80, when a vehicle braking force request value is reduced under a condition where the vehicle braking force request value is equal to or more than a first braking force, executes first reduction processing in which a regenerative braking force applied to rear wheels RL, RR is reduced and the rear wheel hydraulic pressure is maintained while reducing the front wheel hydraulic pressure by reducing the reference hydraulic pressure.
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