Vehicular Brake Device Dual Pressure Source Control
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Solution Overview
Problem
The existing vehicular brake devices for hybrid vehicles have a poor redundancy in pressurized configuration and ineffective initial responsiveness due to reliance on a single electronically controllable pressure source, leading to inefficient regeneration efficiency.
Innovation Solution
A vehicular brake device is designed with two controllable pressure sources, including a piston drive unit and a hydraulic pressure adjusting unit, with a control unit that sets ratios for each source based on operating conditions to improve responsiveness and redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single electronically controllable pressure source is used, then device complexity is reduced, but redundancy of pressurized configuration deteriorates
Solution Approach 1:
The patent combines two different pressure generation mechanisms (piston drive unit and hydraulic pressure adjusting unit with pump) into a single brake device system. These two units work together to provide both redundancy and coordinated control, resolving the contradiction between system complexity and reliability by merging complementary functions rather than using a single complex unit.
Solution Approach 2:
The brake device is designed with multi-functionality where the piston drive unit and hydraulic pressure adjusting unit can operate independently or in combination. The system can switch between different pressure generation modes depending on operating conditions, providing universal pressure generation capability that improves redundancy without requiring completely separate independent systems.
2Device complexity
If a single pressure source is used, then device complexity is reduced, but responsiveness deteriorates
Solution Approach 1:
The system dynamically adjusts the contribution ratio between the piston drive unit and hydraulic pressure adjusting unit based on operating conditions. The control unit varies the first ratio and second ratio in real-time, allowing the system to optimize responsiveness for different braking scenarios while maintaining manageable device complexity through coordinated control.
3Speed
If piston drive unit is used as pressure source, then initial responsiveness is improved, but regeneration efficiency deteriorates
Solution Approach 1:
The system performs preliminary action by having the piston drive unit provide initial pressure quickly when braking is first applied, ensuring immediate responsiveness. Subsequently, the hydraulic pressure adjusting unit takes over or shares the load, allowing the piston to return or reduce its effort, thereby enabling regeneration during non-pressurization phases and improving overall energy efficiency.
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 provides enhanced redundancy and improved responsiveness by utilizing two pressure sources, ensuring effective wheel pressure control and initial brake operation responsiveness.
Implementation Method 1
The piston drive unit drives the master piston by a force corresponding to a hydraulic pressure of an accumulation unit or a driving force of a motor constituting an electric booster and controls a master pressure which is a hydraulic pressure in the master chamber
Implementation Method 2
The hydraulic pressure adjusting unit includes a pump discharging a fluid to the hydraulic pressure path and is configured to be able to pressurize a wheel pressure which is a hydraulic pressure of the wheel cylinder
Data Source
AI summary
The vehicular brake device includes a determination unit, a ratio setting unit, and the control unit. The determination unit determines the operating condition of a vehicular brake device. The ratio setting unit sets, on the basis of the result of determination by the determination unit, a first ratio which is the ratio of a wheel pressure generated by a piston drive unit to a target wheel pressure, and a second ratio which is the ratio of a wheel pressure generated by a hydraulic pressure adjusting unit to the target wheel pressure. The control unit controls the piston drive unit and the hydraulic pressure adjusting unit on the basis of the first ratio and the second ratio.