Estimating Brake Master Cylinder Pressure via Motor Current and Rotor Angle
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Solution Overview
Problem
Existing vehicle braking systems with electromechanical brake boosters face challenges in quickly and reliably estimating brake master cylinder pressure, leading to potential damage during antilock regulation operations due to high pressures and pressure peaks, which are not effectively addressed by conventional methods.
Innovation Solution
An electronic evaluation system that rapidly estimates brake master cylinder pressure by calculating a correction value as the difference between initial and measured values, allowing for continuous optimization and quick reaction to high pressures, and a control apparatus that uses this estimation to control the electromechanical brake booster, thereby reducing the risk of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a pressure sensor is used to measure brake master cylinder pressure and data is transferred via a data bus (e.g., CAN bus), then the measured value is obtained, but the response time is too slow to react quickly to high pressures or pressure peaks
Solution Approach 1:
The patent replaces the mechanical pressure sensor measurement system with an electronic calculation-based pressure estimation system. The control device calculates master cylinder pressure based on motor current, motor rotation angle, and motor characteristics, eliminating the need for physical pressure sensors and data bus transmission, thereby achieving rapid response while maintaining reliability
Solution Approach 2:
The patent introduces motor current and motor rotation angle as intermediary parameters to estimate master cylinder pressure. By using these readily available electrical parameters as mediators, the system can infer pressure information without direct mechanical sensing, enabling fast response while preserving estimation accuracy
2Reliability
If conventional pressure measurement methods are used, then the system structure is simple, but the system cannot react quickly to high pressures during antilock regulation operations, leading to potential damage
Solution Approach 1:
The control device continuously monitors motor current and motor rotation angle to proactively calculate and estimate master cylinder pressure in advance. This preliminary action allows the system to detect potential high pressure conditions before they cause damage, enabling preventive control measures during antilock regulation operations
Solution Approach 2:
The patent implements a feedback mechanism where the control device continuously calculates master cylinder pressure based on real-time motor current and rotation angle data, and uses this feedback to adjust motor control. This closed-loop feedback enables rapid response to pressure changes while protecting the brake system
Data Source
AI summary
In an electronic evaluation system for a vehicle braking system equipped with an electromechanical brake booster, a method for estimating a brake master cylinder pressure includes: estimating a first initial value of the pressure based on a first current intensity of a current of a motor of the booster at the first time and on a first rotation angle of a rotor of the motor at the first time; specifying a correction value as a difference between the first initial value and a measured value of the pressure; estimating a second initial value of the pressure based on a second current intensity of the current at the second time and on a second rotation angle of the rotor at the second time; and specifying, based on the second initial value and the correction value, an estimated value of the pressure at the second time.