Brake Control Device for Seamless Regenerative-Hydraulic Transition
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Solution Overview
Problem
Existing brake systems for vehicles with electrical drive units face challenges in seamlessly integrating regenerative braking with hydraulic braking, leading to a less-than-ideal user experience and increased costs due to the need for adapting wheel brake caliper and accumulator spring characteristics.
Innovation Solution
A controlling device and method that prevent the transmission of force between the brake actuating element and the master brake cylinder piston at low actuating intensities, allowing for regenerative braking without hydraulic braking torque, ensuring a consistent braking feel and reducing the need for costly adaptations in the brake system components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative braking is implemented by displacing brake fluid into the accumulator, then energy recovery is improved, but the driver perceives a difference in braking feel
Solution Approach 1:
The invention introduces a decoupling mechanism that acts as an intermediary between the brake actuating element and the master brake cylinder piston. This mechanism includes a first valve controlled by a controller to prevent force transmission when regenerative braking is active, allowing brake fluid to be displaced into the accumulator without the driver perceiving the difference in braking characteristics.
2Reliability
If wheel brake caliper and accumulator spring characteristics are adapted to each other, then braking performance is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The invention extracts the spring characteristic adaptation requirement from the physical components and relocates it to the control system. By using the controller to manage force transmission through the valve mechanism, the system achieves coordinated braking behavior without requiring precise mechanical matching of the accumulator spring to the wheel brake calipers, significantly simplifying manufacturing.
3Use of energy by moving object
If force transmission is prevented at low actuating intensities, then regenerative braking efficiency is improved, but braking reliability may be compromised
Solution Approach 1:
The invention implements a dynamic control system that adjusts force transmission based on operating conditions. The controller monitors actuating intensity and valve position, dynamically switching between regenerative braking mode (force transmission prevented) and hydraulic braking mode (force transmission enabled). This ensures optimal energy recovery when possible while maintaining braking reliability when needed.
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
This solution enhances user-friendliness by masking the transition between regenerative and hydraulic braking, maintaining braking efficiency and reliability even when the brake booster is impaired, without requiring free play in the brake system components, thus ensuring reliable deceleration and cost-effective implementation.
Implementation Method 1
the at least one corresponding wheel brake caliper (16a, 16b) and an accumulator (18a, 18b)... the spring characteristics of the at least one wheel brake caliper and the corresponding accumulator
Implementation Method 2
the pressurized media displaced from the master brake cylinder to the wheel brakes via manipulation of the brake pedal
Data Source
AI summary
A controlling device for a brake system, including a generator control device, by which a setpoint generator braking torque may be set regarding an actuating intensity of a manipulation of a brake actuating element; and a valve control device, by which, if the stipulated setpoint generator braking torque is equal to zero, at least one accumulator opening valve of a brake circuit may be forced into a first valve position in such a manner, that displacement of brake fluid from a master brake cylinder into at least one wheel brake caliper of the brake circuit may be effected and displacement of brake fluid from the master brake cylinder into an accumulator of the brake circuit is prevented. If the stipulated setpoint generator braking torque is not equal to zero, the at least one accumulator opening valve may be forced into a second valve position.