Vehicle Braking Device with Dual Hydraulic Pressure Generation
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Solution Overview
Problem
Conventional vehicle braking devices do not consider the physical size and weight of the master cylinder, leading to inefficiencies and a need for a more compact design that can maintain hydraulic pressure during fading conditions.
Innovation Solution
A braking device with a first hydraulic pressure generation unit, a second hydraulic pressure generation unit capable of generating pressure in a bottoming state, a braking force generation unit, and a braking force control unit that manages hydraulic pressure to apply braking force effectively, allowing the master cylinder to be compacted by eliminating the need for excessive volume during fading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the master cylinder is designed with large volume to maintain hydraulic pressure during fading, then the braking force reliability is improved, but the physical size and weight of the master cylinder increases
Solution Approach 1:
The invention divides the hydraulic pressure generation function into two separate units: a first hydraulic pressure generation unit (master cylinder with master piston) for normal braking operations, and a second hydraulic pressure generation unit for generating desired hydraulic pressure specifically in the bottoming state. This segmentation allows the master cylinder to be sized for normal operations only, while the second unit handles the fading compensation function, thus reducing the master cylinder volume while maintaining overall system reliability.
Solution Approach 2:
The invention introduces a second hydraulic pressure generation unit as an intermediary component that mediates between the master cylinder and the braking force generation unit. This intermediary unit generates additional hydraulic pressure when the master cylinder reaches its bottoming state, effectively compensating for pressure loss during fading without requiring the master cylinder to be oversized.
2Ease of operation
If the master cylinder volume is reduced for compactness, then the ease of installation is improved, but the ability to maintain hydraulic pressure during fading deteriorates
Solution Approach 1:
By segmenting the hydraulic pressure generation functions into two separate units, the master cylinder can be minimized in size for easy installation, while the second hydraulic pressure generation unit independently handles the fading compensation function, ensuring reliability is not compromised.
Solution Approach 2:
The second hydraulic pressure generation unit is designed to activate specifically in the bottoming state, performing the necessary pressure generation action in advance or at the critical moment when fading occurs, thus maintaining hydraulic pressure reliability without requiring a larger master cylinder.
3Reliability
If the master cylinder is oversized to prevent bottoming during fading, then the braking force reliability is improved, but the device complexity increases
Solution Approach 1:
The invention segments the braking system into distinct functional units with clearly defined roles: the first hydraulic pressure generation unit for normal operations and the second hydraulic pressure generation unit for bottoming state compensation. This functional segmentation actually reduces overall system complexity compared to an oversized master cylinder design, as each unit can be optimized and controlled independently.
Solution Approach 2:
The system dynamically switches between the first and second hydraulic pressure generation units based on the operating state. The control unit activates the second unit specifically when bottoming is detected, creating a dynamic response that maintains reliability without requiring permanent oversizing of the master cylinder or continuous complex 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 solution enables the generation of desired braking force on the wheel in a bottoming state, reducing the master cylinder's volume requirements and improving mountability on various vehicles by making it more compact.
Implementation Method 1
a first hydraulic pressure generation unit including a master cylinder and a master piston that slides in the master cylinder in association with brake operation, the first hydraulic pressure generation unit that generates a hydraulic pressure according to a volume of a master chamber
Implementation Method 2
a second hydraulic pressure generation unit configured to be able to generate a desired hydraulic pressure in a bottoming state in which forward movement of the master piston is regulated by the master cylinder
Implementation Method 3
a braking force generation unit that applies braking force according to an input hydraulic pressure to a wheel of a vehicle
Data Source
AI summary
Provided is a braking device for a vehicle comprising: a first hydraulic pressure generation unit which generates hydraulic pressure corresponding to the volume of a master chambers in the master chambers that change in volume according to the movement of master pistons; a second hydraulic pressure generation unit which is configured so as to be capable of generating a desired hydraulic pressure in a bottoming state in which the forward movement of the master pistons is restricted by a master cylinder; braking force generation units which apply the braking force corresponding to the input hydraulic pressure to wheels of a vehicle; and a braking force control unit which causes the second hydraulic pressure generation unit to generate hydraulic pressure in the bottoming state, and inputs the hydraulic pressure to the braking force generation units.