Electromechanical Wheel Brake Redundancy With Shared Motor Control
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Solution Overview
Problem
Existing electromechanical brake systems for motor vehicles lack redundancy in brake mechanisms, leading to reduced braking power and increased complexity and cost when components fail, particularly in 'brake-by-wire' systems without mechanical emergency operation.
Innovation Solution
The system incorporates primary and secondary electric motors and control devices assigned to each wheel brake device, with secondary motors providing redundancy, and control devices evaluating sensor data to ensure continued braking functionality even in the event of component failure, while minimizing installation space and cost by reducing the number of control devices needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant components are installed to ensure braking power in the event of failure, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
Each control device is designed to control multiple wheel brake devices (up to three), allowing a single control device to perform multiple functions. This multi-functionality reduces the total number of control devices needed while maintaining redundancy, as control devices can take over failed brake mechanisms across different wheels
Solution Approach 2:
The patent combines the functions of multiple control devices into fewer units. By merging control capabilities, the system achieves redundancy without requiring separate dedicated control devices for each brake mechanism, thereby reducing overall system complexity while maintaining safety
2Device complexity
If control devices are assigned to multiple wheel brake devices, then device complexity is reduced, but measurement precision and control accuracy may worsen
Solution Approach 1:
Control devices are designed with universal sensing and evaluation capabilities that allow them to accurately monitor and control multiple wheel brake devices. The control devices incorporate sensors and evaluation logic that can handle multiple inputs and outputs without sacrificing measurement precision
Solution Approach 2:
The control devices continuously acquire sensor data from multiple wheel brake devices and perform real-time evaluation to adjust control signals. This feedback mechanism ensures that even when controlling multiple brakes, the system maintains high measurement precision and response accuracy through continuous monitoring and adjustment
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
Ensures full braking power is maintained with reduced complexity and cost by using spatially and functionally redundant components, and efficient actuation through direct sensor data acquisition, enhancing reliability and safety.
Implementation Method 1
Each of the wheel brake devices (2) is respectively assigned one of the primary electric motors (3) and one of the secondary electric motors (4) in each case for operating the respective wheel brake devices (2)
Data Source
AI summary
An electromechanical brake system for a motor vehicle. The brake system includes four wheel brake devices, four primary electric motors, four secondary electric motors, and four control devices. The control devices are designed to acquire and/or evaluate sensor data from sensors assigned to the wheel brake devices and/or to the motor vehicle. Each of the wheel brake devices is assigned one of the primary electric motors and one of the secondary electric motors respectively for operating the respective wheel brake devices. Each of the control devices is respectively assigned to one of the primary electric motors of one of the wheel brake devices and to one of the secondary electric motors of another of the wheel brake devices for actuating the electric motors.