Dual Hydraulic Brake Actuation With Regenerative Backup
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Solution Overview
Problem
Conventional vehicle braking systems with redundancy backup systems are inefficient as they require a separate drive source for hydraulic active roll stabilizers, leading to increased space usage and costs, and do not effectively utilize actuators when the main braking system is operational.
Innovation Solution
The proposed apparatus includes two actuators with independent hydraulic circuits and a regenerative braking system, allowing each actuator to control fewer wheel brakes, reducing the amount of braking fluid needed and eliminating the need for a separate drive source for the hydraulic active roll stabilizer, while the electronic parking brake provides additional braking force when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional redundancy brake system is used with a separate hydraulic pump for active roll stabilizer, then braking reliability is improved, but vehicle space and manufacturing cost increase
Solution Approach 1:
The patent merges the hydraulic pump function into the existing braking system by utilizing the master cylinder from the braking system to also supply hydraulic pressure to the active roll stabilizer. This eliminates the need for a separate hydraulic pump and reduces vehicle space requirements while maintaining braking reliability through the redundancy of having two actuators.
Solution Approach 2:
The master cylinder from the braking system is designed to serve dual purposes: providing hydraulic pressure for wheel brakes and providing hydraulic pressure for the active roll stabilizer. This multi-functionality reduces the number of separate components needed in the vehicle.
2Reliability
If a conventional redundancy brake system with separate drive source is used, then braking reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines the hydraulic supply function into a single master cylinder that serves both the braking system and the active roll stabilizer, eliminating the need for a separate hydraulic pump and reducing manufacturing costs while maintaining system reliability.
Solution Approach 2:
The master cylinder is designed with universal functionality to supply hydraulic pressure to multiple systems (wheel brakes and active roll stabilizer), reducing the total number of components and lowering manufacturing costs.
3Device complexity
If one actuator controls all wheel brakes, then system complexity is reduced, but brake response speed decreases
Solution Approach 1:
The patent divides the control of wheel brakes into two separate actuators, where each actuator controls a subset of the wheel brakes. This segmentation allows for faster response times as each actuator can independently and simultaneously apply braking force to its designated wheels, improving overall brake response speed.
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 configuration reduces production costs, improves brake response speed, and optimizes space usage by allowing the vehicle to operate with a low-specification motor and eliminating the need for a separate hydraulic pump, while ensuring fail-proof braking through dual actuator control.
Implementation Method 1
a first master cylinder configured to adjust a hydraulic pressure of the first hydraulic circuit
Implementation Method 2
a second master cylinder configured to adjust a hydraulic pressure of the second hydraulic circuit
Implementation Method 3
The regenerative braking system is configured to generate a regenerative braking force
Data Source
AI summary
The present disclosure in some embodiments provides a vehicle braking apparatus including wheel brakes for providing a braking force to one or more front and rear wheels, a first actuator including a first hydraulic circuit supplying braking force to at least some of wheel brakes, a first master cylinder adjusting hydraulic pressure of the first hydraulic circuit, and a first motor, a second actuator including a second hydraulic circuit supplying a braking force to at least a remainder of the wheel brakes, a second master cylinder adjusting hydraulic pressure of the second hydraulic circuit, and a second motor, an EPB generating a braking force on rear wheels, a regenerative braking system generating a regenerative braking force, and an ECU for controlling at least one of the first actuator, second actuator, electronic parking brake, or regenerative braking system upon determining whether the first actuator and the second actuator malfunction.