Electromechanical Brake Clamping Force Sensing via Hydraulic Cavity
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Solution Overview
Problem
Existing electromechanical brake devices lack accurate methods to determine the clamping force applied by the clamping device, which is crucial for controlling the braking torque.
Innovation Solution
An electromechanical brake device with a hydraulically sealed, fluid-filled cavity supports the clamping device on one side on the pressure piston and indirectly on the brake caliper, using a pressure sensor to measure the fluid pressure within the cavity, allowing for precise determination of the clamping force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromechanical brake devices use motor current and motor position to calculate clamping force, then the control of braking torque becomes possible, but the measurement precision of clamping force is insufficient
Solution Approach 1:
The patent introduces a fluid-filled cavity as an intermediary between the clamping device and the pressure sensor. The cavity translates the mechanical clamping force into hydraulic pressure, which can be precisely measured by the pressure sensor. This intermediary mechanism enables accurate clamping force measurement without requiring direct mechanical sensing in the electromechanical drive path.
Solution Approach 2:
The patent employs hydraulic principles by using a fluid-filled cavity to transmit and amplify the clamping force. The pressure sensor measures the hydraulic pressure within the cavity, which is directly proportional to the clamping force applied by the electromechanical device. This hydraulic translation provides precise measurement capability.
2Measurement precision
If force sensors are used to measure forces in the brake caliper, then clamping force can be determined, but the device complexity and cost increase
Solution Approach 1:
The patent replaces expensive force sensors with a hydraulic pressure measurement system. By using a fluid-filled cavity to translate clamping force into pressure, the system can use cost-effective pressure sensors instead of complex and costly force sensors, thereby reducing manufacturing costs while maintaining measurement precision.
Solution Approach 2:
The fluid-filled cavity serves as a cost-effective intermediary that enables force measurement through pressure sensing rather than direct mechanical force sensing. This approach uses readily available and inexpensive pressure sensor technology instead of expensive force sensors.
3Reliability
If electromechanical brake devices lack accurate clamping force determination, then the braking torque control accuracy deteriorates, but adding complex measurement systems increases device complexity
Solution Approach 1:
The patent implements a feedback mechanism where the pressure sensor continuously monitors the hydraulic pressure in the fluid-filled cavity, which reflects the actual clamping force. This information is fed back to the control system, enabling accurate braking torque control by comparing the measured clamping force with the desired value and adjusting the electromechanical drive accordingly.
Solution Approach 2:
The fluid-filled cavity acts as a reliable intermediary that provides accurate feedback information about the clamping force. This hydraulic feedback mechanism ensures reliable braking torque control without requiring complex direct force measurement and feedback systems.
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 enables precise control of the clamping force, improving accuracy and allowing for cost-effective implementation using existing pressure sensor technology.
Implementation Method 1
the clamping device is supported, on another side, indirectly on the brake caliper via the fluid-filled cavity... a pressure sensor is hydraulically connected to the fluid-filled cavity and is designed to calculate the fluid pressure inside the fluid-filled cavity
Data Source
AI summary
An electromechanical brake device has a brake caliper and a pressure piston mounted in the brake caliper such that it can move in a clamping direction, wherein the brake device has an electromechanical clamping device, wherein the clamping device is supported, on one side, on the pressure piston and is designed to apply to the pressure piston a force acting in the clamping direction. It is provided that the brake device has at least one hydraulically sealed, fluid-filled cavity, wherein the clamping device is supported, on the other side, indirectly on the brake caliper via the fluid-filled cavity, and wherein a pressure sensor is hydraulically connected to the fluid-filled cavity and is designed to calculate the fluid pressure inside the fluid-filled cavity.