Electronic Brake System Valve Simplification
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Solution Overview
Problem
The complexity of solenoid valve arrangements in electronic brake systems leads to increased vibration, noise, and weight, compromising ease of mounting and efficient space use, while existing systems require multiple valves for each wheel, making them cumbersome and inefficient.
Innovation Solution
An electronic brake system with a simplified configuration using fewer valves, where two inlet valves control hydraulic pressure for two wheels each, with balance valves connecting or disconnecting wheel cylinders, and backup paths ensuring stable braking even in abnormal conditions, utilizing a hydraulic pressure supply unit that converts rotational power to linear motion for precise pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple solenoid valves are individually operated to control hydraulic pressure for each wheel, then precise pressure control is achieved, but vibration and noise increase
Solution Approach 1:
The patent merges the control of multiple wheel cylinders into a single integrated control unit with one solenoid valve that regulates hydraulic pressure for all wheels simultaneously, eliminating the vibration and noise caused by multiple individually operated valves while maintaining precise pressure control through centralized regulation
2Adaptability or versatility
If multiple solenoid valves and flow paths are provided for each wheel, then individual wheel pressure control is enabled, but device complexity increases
Solution Approach 1:
The patent implements a universal control architecture where a single solenoid valve and control unit serve all wheel cylinders, enabling the system to perform individual wheel pressure control when needed while maintaining the capability for overall system pressure management, thus reducing complexity while preserving adaptability
3Power
If motor, pump, and low pressure accumulator are added to the system, then hydraulic pressure generation capability is enhanced, but weight and volume increase
Solution Approach 1:
The patent utilizes the vehicle's existing hydraulic brake system infrastructure, where the master cylinder and existing hydraulic pressure generation mechanisms serve the electronic brake control functions, eliminating the need for additional motors, pumps, and accumulators while maintaining sufficient hydraulic pressure generation capability
4Power
If existing hydraulic pressure supply unit with motor is used, then brake pressure generation is achieved, but ease of mounting is compromised
Solution Approach 1:
The patent extracts the electronic control functions from the existing hydraulic system and integrates them into a compact control unit that interfaces with the master cylinder, eliminating the need for separate motor and pump assemblies while maintaining brake pressure generation capability, thus improving ease of mounting and system integration
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 structural simplification, reduced noise and vibration, precise pressure control, and enhanced control capability, allowing for stable braking even when components fail, while minimizing the number of valves and system size, thus reducing costs and improving reliability.
Implementation Method 1
the brake pressure is generated by converting a rotatory power of the motor to a rectilinear movement to press a piston
Implementation Method 2
a master cylinder having a first oil pressure port and a second oil pressure port and coupled with the reservoir to receive the oil
Data Source
AI summary
An electronic brake system may be capable of performing braking operation according to a pedal effort of a driver even when the brake system operates abnormally as well as simplifying a configuration thereof by minimizing the number of valves for controlling a flow of oil pressure and precisely controlling pressure therein.