Electromechanical Brake Booster Torque Control
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Solution Overview
Problem
Conventional electromechanical brake boosters face challenges in timely limiting forces during brake actuating element blockages, leading to potential injury or damage, especially in automated/autonomous braking scenarios, and require redundant sensing that often results in delayed recognition of blockages due to time delays in pressure sensor signals.
Innovation Solution
A control device for electromechanical brake boosters that adjusts the motor torque based on differential path deviations, using a buffer element or spring element to increase the differential path when a retaining force exceeds a threshold, allowing for early recognition of potential blockages without immediate interruption of the braking process, thus enabling continued operation while minimizing risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional redundant sensing with pressure sensors is used to detect blockages, then blockage detection capability is provided, but recognition is delayed due to time delays in pressure sensor signals
Solution Approach 1:
The system performs preliminary action by monitoring the differential path between the brake actuating element and valve body in real-time. When the differential path deviates from the normal range, it indicates a potential blockage before it fully develops, allowing early intervention. This preliminary detection mechanism avoids the time delay inherent in conventional pressure sensor-based redundant sensing by directly measuring the positional relationship between key components.
2Object-affected harmful factors
If the motor operation is immediately interrupted upon suspicion of blockage, then safety is improved, but the electromechanical brake booster cannot be used longer without risk
Solution Approach 1:
The system applies dynamics by adaptively adjusting the motor torque based on the monitored differential path. When the differential path deviates from the normal range, indicating a potential blockage, the control device limits the motor torque to a reduced level rather than immediately interrupting operation. This dynamic torque adjustment allows the brake booster to continue operating in a safe, limited-capacity mode, extending operational duration while maintaining safety. Only when the differential path deviation exceeds predetermined thresholds does the system interrupt motor operation to prevent injury or damage.
Solution Approach 2:
The system changes parameters by dynamically adjusting the motor torque parameter based on the differential path measurement. Instead of a binary on/off control, the system modifies the torque parameter continuously according to the degree of differential path deviation. This parameter change approach enables graded response to potential blockages, allowing extended operation at reduced torque levels while preventing harmful effects, thus resolving the contradiction between safety and operational duration.
3Force
If the differential path is limited to a specified limit differential path, then force limitation during blockage is achieved, but the system lacks adaptability to early suspicion of blockage
Solution Approach 1:
The system performs preliminary action by detecting deviations in the differential path before a full blockage occurs. The control device continuously monitors the differential path between the brake actuating element and valve body, and when this differential path deviates from the normal range, it indicates early suspicion of blockage. This preliminary detection enables the system to adaptively limit motor torque before the differential path reaches the hard limit, providing both force limitation and adaptability to early blockage suspicion.
Solution Approach 2:
The system changes parameters by dynamically adjusting motor torque based on the actual differential path measurement. Instead of enforcing a fixed limit differential path from the start, the system allows the differential path to vary within acceptable ranges and only limits torque when deviation occurs. This parameter change approach provides both force limitation (when needed) and adaptability (to early blockage suspicion), resolving the contradiction between these two requirements.
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 solution enables early detection of potential blockages, allowing for adaptive operation to prevent injury or damage, reduces the need for redundant sensing, and maintains the ability to perform automated/autonomous braking with reduced risk of injury or damage, even when a blockage is suspected.
Implementation Method 1
at least one buffer element or spring element (16) situated on the input rod (14) and/or on the valve body (12) in such a way that if during the displacement movement of the valve body (12) in the braking direction a retaining force above the specified threshold value counteracts the co-displacement movement of the input rod (14) in the braking direction, the differential path (d) between the valve body (12) set into the displacement movement in the braking direction and the input rod (14) can be increased above the specified limit differential path (d0) via a deformation of the at least one buffer element or spring element (16)
Data Source
AI summary
The invention relates to a control device (10) for at least one electromechanical brake booster of a brake system of a vehicle having an electronics device (32) that is designed to compare a provided sensor signal (38) relating to a differential path (d) between a valve body (12), displaced by a controlled motor, of the electromechanical brake booster and an input rod (14) of the brake system with a specified normal value range, such that, if the sensor signal (38) relating to the differential path (d) lies outside the specified normal value range, the electronics device (32) is in addition designed to define a maximum limit value for a target quantity relating to a target motor torque to be carried out by the motor, at least taking into account the sensor signal (38), in such a way that, at least during a specified time interval after the defining of the maximum limit value, at most an actual motor torque corresponding to the defined maximum limit value can be carried out by the controlled motor. The present invention also relates to an electromechanical brake booster for a brake system of a vehicle, to a brake system for a vehicle, and to a method for operating an electromechanical brake booster of a brake system of a vehicle.