Double-Acting Piston Electric Brake System
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Solution Overview
Problem
Existing electric brake systems with single-acting structures face challenges in rapid pressure generation and precise control, and have complex structures due to the need for multiple valves and flow passages.
Innovation Solution
An electric brake system with a double-acting hydraulic-pressure supply device and a simplified hydraulic circuit configuration, utilizing a double-acting piston that moves in both directions to generate hydraulic pressure, and a minimal number of valves to control flow, allowing for quick pressure regeneration and boosting, and precise pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-acting piston structure is used, then the system structure is simpler, but rapid pressure generation and precise control become difficult
Solution Approach 1:
The patent applies the inversion principle by using a double-acting piston structure where the piston can be pressurized from both directions (front and rear sides). This allows the piston to move rapidly in both forward and backward directions, enabling quick pressure generation and precise control without requiring the piston to return to original position repeatedly. The inversion of the traditional single-acting approach resolves the contradiction between structural simplicity and control precision.
Solution Approach 2:
The patent implements dynamics by enabling the piston to operate dynamically in both directions with independent pressure control. The hydraulic system can supply pressure to either side of the piston based on operational requirements, allowing adaptive and flexible pressure generation. This dynamic operation enables rapid response and precise control while maintaining a relatively simple overall structure.
2Adaptability or versatility
If multiple valves and flow passages are added for electronic control, then braking functions are enhanced, but the system structure becomes complicated
Solution Approach 1:
The patent applies the universality principle by designing a hydraulic circuit where a minimal set of valves performs multiple functions. The first and second cut valves not only control pressure supply to the piston but also enable various braking modes (regenerative braking, friction braking, ABS, etc.) through different pressure control sequences. This multi-functional approach enhances braking versatility while keeping the valve count minimal and structure simple.
Solution Approach 2:
The patent merges multiple control functions into a unified hydraulic circuit design. The first hydraulic circuit (front side of piston) and second hydraulic circuit (rear side of piston) are integrated with shared components including the reservoir, pump, and control unit. This merging allows coordinated pressure control on both sides of the piston using a minimal number of valves, reducing overall system complexity while maintaining enhanced braking functionality.
3Productivity
If a double-acting piston structure is used, then rapid pressure generation and precise control are achieved, but the number of hydraulic circuits increases
Solution Approach 1:
The patent applies segmentation by dividing the hydraulic system into two independent but coordinated circuits: the first hydraulic circuit supplying pressure to the front side of the piston, and the second hydraulic circuit supplying pressure to the rear side. Each circuit has its own pressure control capability through dedicated cut valves. This segmentation enables rapid pressure generation on either side independently, achieving high productivity while maintaining manageable circuit complexity through modular design.
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 system achieves rapid pressure generation and precise control, simplifies the structure by reducing the number of valves, and ensures stable braking performance even during malfunctions, while allowing direct application of foot force for braking.
Implementation Method 1
a hydraulic-pressure supply device configured to convert rotational force of a motor into rectilinear motion upon receiving an electric signal from the pedal displacement sensor according to operation of the brake pedal, and move a double-acting piston designed to perform reciprocating motion within a hydraulic cylinder
Implementation Method 2
the double-acting piston moves in one direction to generate hydraulic pressure by pressing a first hydraulic chamber provided in one end thereof, and moves in another direction to generate hydraulic pressure by pressing a second hydraulic chamber provided in the other end thereof
Data Source
AI summary
An electric brake system includes a reservoir, a master cylinder including first and second hydraulic ports, a simulation device providing reaction force in response to foot force applied to a brake pedal, a hydraulic-pressure supply device, a hydraulic-pressure control unit, and an electronic control unit (ECU). The hydraulic-pressure supply device converts rotational force of a motor into rectilinear motion upon receiving an electric signal from the pedal displacement sensor, and moves a double-acting piston designed to perform reciprocating motion within a hydraulic cylinder. The double-acting piston moves in both directions such that the first hydraulic chamber located at one side or the second hydraulic chamber located at the other side are pressed, resulting in formation of hydraulic pressure.