Electronic Brake Valve Control for ABS Noise Reduction
Solution Overview
Problem
The existing electronic brake systems generate noise during anti-lock braking system (ABS) operation due to the on/off control of valves, which affects the control response and stability of the braking process.
Innovation Solution
The electronic brake system incorporates a controller that adjusts the electromagnetic force of the valve based on the hydraulic pressure difference between the wheel cylinder and the hydraulic control unit, allowing for precise control of the motor position to manage the hydraulic pressure and reduce noise during ABS operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If on/off control is used for valve operation during ABS control, then rapid control response is achieved, but noise is generated during depressurization
Solution Approach 1:
The valve control is changed from static on/off control to dynamic proportional control based on pressure difference. The valve opening degree is dynamically adjusted according to the measured pressure difference between wheel cylinder and hydraulic control unit, allowing smooth transitions rather than abrupt on/off changes that cause noise.
Solution Approach 2:
The control parameter is changed from binary (on/off) to continuous proportional control. By controlling the electromagnetic force of the valve in proportion to the pressure difference, the system achieves smooth pressure regulation without the sudden changes that generate noise during depressurization.
2Object-generated harmful factors
If electromagnetic force control is implemented based on pressure difference, then noise is reduced, but control system complexity increases
Solution Approach 1:
A feedback mechanism is implemented where the pressure difference between wheel cylinder and hydraulic control unit is continuously measured and used to adjust the valve electromagnetic force. This closed-loop feedback control reduces noise while maintaining manageable system complexity through straightforward pressure-based regulation.
Solution Approach 2:
The control system replaces complex mechanical pressure regulation mechanisms with electromagnetic force control. By using electromagnetic actuation based on pressure difference measurements, the system achieves smooth noise-free control without complex mechanical linkages or valve mechanisms.
3Manufacturing precision
If motor position control is used to increase hydraulic pressure, then precise pressure control is achieved, but energy consumption increases
Solution Approach 1:
Instead of continuously controlling motor position for pressure regulation, the system uses partial action by only activating the motor when pressure adjustment is needed and using valve electromagnetic force control for fine pressure regulation. This reduces overall energy consumption while maintaining precise pressure control when required.
Solution Approach 2:
The system dynamically selects between motor-driven pressure generation and valve-based pressure regulation. The motor provides rapid pressure build-up when needed, while the electromagnetically controlled valve handles fine pressure adjustments, optimizing energy usage based on real-time pressure requirements.
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 solution effectively reduces noise and improves the control response by maintaining a stable hydraulic pressure, enhancing the overall performance and reliability of the ABS system.
Implementation Method 1
a current flows through the valve by the on/off control to open a space between the plunger and the valve seat by overcoming a spring force by an electromagnetic force
Data Source
AI summary
Disclosed herein is an electronic brake system. An electronic brake system according to an embodiment of the present disclosure, which is an electronic brake system including a pedal displacement sensor configured to sense displacement of a brake pedal according to a pedal effort of the brake pedal, a hydraulic pressure supply device configured to generate a hydraulic pressure using a rotational force of a motor operated by an electrical signal output from the pedal displacement sensor, and a hydraulic control unit configured to transmit a hydraulic pressure discharged from the hydraulic pressure supply device to wheel cylinders provided on respective wheels, includes a plurality of valves configured to adjust the hydraulic pressures transmitted to the wheel cylinders, a pressure measurer configured to measure hydraulic pressures of the wheel cylinders and a hydraulic pressure of the hydraulic control unit, and a controller configured to control an electromagnetic force of the valve when a difference between the measured hydraulic pressure of the wheel cylinder and the measured hydraulic pressure of the hydraulic control unit is more than a preset first threshold value during an anti-lock braking system (ABS) operation.