Electromechanical Brake Pre-Charge Pressure Control
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Solution Overview
Problem
Electromechanical brake systems in vehicles face delays in reaction time due to inertia in their electronic and hydraulic components, which can be improved for faster and more responsive braking.
Innovation Solution
A method is introduced to build up a pre-charge pressure in the brake system before a braking event, using electric motors and sensors to anticipate deceleration requests, such as through accelerator pedal release or collision detection, and apply this pressure to the wheel brakes, reducing reaction time to near zero.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromechanical brake systems operate without vacuum and generate brake pressure exclusively by electric motors, then the system structure is simplified and reliability is improved, but the reaction time increases due to inertia in electronic and hydraulic components
Solution Approach 1:
The system performs preliminary action by building up pre-charge pressure in the hydraulic circuit before a braking event occurs. When deceleration is anticipated (through accelerator pedal release or collision detection), the electric motor-driven pump pressurizes the brake fluid in advance, so that when braking is actually requested, the pressure is already present and reaction time is minimized.
2Loss of time
If pre-charge pressure is built up in the brake system before braking, then reaction time is reduced, but energy consumption increases
Solution Approach 1:
The system uses periodic action by triggering pre-charge pressure buildup only at specific intervals or conditions - specifically when deceleration is anticipated through accelerator pedal release or collision detection. This selective periodic activation minimizes energy consumption while maintaining the performance benefit of reduced reaction time when needed.
Solution Approach 2:
The system applies dynamics by making the pre-charge pressure level adaptive based on the anticipated braking scenario. The control system dynamically adjusts the pressure buildup based on the activation condition (accelerator release rate, collision risk level), optimizing the balance between reaction time reduction and energy consumption for each specific situation.
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 method significantly reduces the reaction time of electromechanical brake systems, providing improved power output and safety by preparing the brake system for immediate pressure application, outperforming conventional vacuum-based systems.
Implementation Method 1
building up at least an initial portion of the pre-charge pressure in the brake system
Implementation Method 2
applying at least the initial portion of the pre-charge pressure to at least one wheel brake
Data Source
AI summary
A method for operating an electromechanical vehicle brake system is provided. The method includes determining that an activation condition has been met, selecting a pre-charge pressure based at least in part on the activation condition, building up at least an initial portion of the pre-charge pressure in the brake system, and applying at least the initial portion of the pre-charge pressure to at least one wheel brake.