Electromechanical Braking Pre-Pressure Adaptation
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Solution Overview
Problem
Electromechanical vehicle braking systems face challenges in adapting pre-pressure to individual deceleration requests, leading to potential over-braking and elongated reaction times due to the lack of mechanical connection between the brake pedal and wheel brakes.
Innovation Solution
A method is introduced to create a temporary pre-pressure in the braking system based on trigger factors, which can be adjusted and partially reduced to match the expected braking pressure, allowing for precise application to the wheel brakes, thereby reducing reaction time and preventing over-braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If pre-pressure is created in advance to reduce reaction time, then braking response speed is improved, but over-braking may occur due to inadequate adaptation to individual deceleration requests
Solution Approach 1:
The system creates pre-pressure in advance based on trigger factors (accelerator pedal release, object detection, distance to preceding vehicle) to reduce reaction time. This preliminary action prepares the braking system for potential emergency braking by building pressure before actual deceleration is needed.
Solution Approach 2:
The pre-pressure is made dynamically adjustable through a reduction factor that adapts to individual deceleration requests. The control unit calculates the reduction factor based on the relationship between pre-pressure and expected braking pressure, allowing the system to transition from a static pre-pressure state to a dynamically adapted braking pressure that matches actual deceleration needs.
2Manufacturing precision
If pre-pressure is reduced to match expected braking pressure, then braking precision is improved, but system complexity increases due to additional control mechanisms
Solution Approach 1:
The system changes the pressure parameter dynamically by applying a reduction factor to the pre-pressure. This allows precise adaptation of braking pressure to match expected deceleration requests while using a relatively simple control mechanism that calculates and applies the reduction factor based on sensor inputs and pre-defined relationships.
Data Source
AI summary
A method for operating an electromechanical vehicle brake system is provided. The method comprises determining that an activation condition has been met, building an initial portion of the pre-charge pressure in the brake system, applying the initial portion of the pre-charge pressure to at least one wheel brake, building a secondary portion of the pre-charge pressure in the brake system, and adjusting the secondary portion of the pre-charge pressure to an expected braking pressure. Adjusting the secondary portion of the pre-charge pressure may include reducing the secondary portion of the pre-charge pressure.