Hydraulic-Electromechanical Brake Transfer Torque Synchronization
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Solution Overview
Problem
Current braking systems for motor vehicles require a lengthy transfer from hydraulic to electromechanical actuation, increasing load and necessitating continuous hydraulic pressure monitoring due to leakage losses.
Innovation Solution
A method that enables a rapid transfer from hydraulic to electromechanical actuation by synchronizing the braking torques of both systems, allowing the electromechanical force generator to support the brake application element before hydraulic pressure dissipation, reducing overall load and eliminating the need for continuous hydraulic pressure monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transfer from hydraulic to electromechanical actuation waits until the electromechanical force generator has built up sufficient braking force on its own, then the braking force is sufficient during transfer, but the transfer duration is lengthy and the load on the braking apparatus increases
Solution Approach 1:
The hydraulic pressure generator is actuated in advance to build up braking force before the electromechanical force generator is fully engaged. This preliminary hydraulic braking force ensures that sufficient braking force is available during the transfer process, eliminating the need to wait for the electromechanical generator to build force independently.
Solution Approach 2:
The braking forces from the hydraulic pressure generator and the electromechanical force generator are combined during the transfer process. The hydraulic system provides initial braking force while the electromechanical system ramps up, and both forces act together to maintain sufficient braking capability throughout the transition.
2Reliability
If the transfer waits for the electromechanical force generator to build sufficient braking force independently, then braking force is maintained, but the load on the braking apparatus increases
Solution Approach 1:
The hydraulic pressure generator is activated beforehand to establish the required braking force. This preliminary action means that when the electromechanical force generator begins operation, the hydraulic system is already providing sufficient braking force, so the electromechanical generator does not need to build force independently, thereby reducing the peak load on the braking apparatus.
Solution Approach 2:
The braking forces from both the hydraulic pressure generator and the electromechanical force generator are merged during the transfer. This combination allows the system to distribute the load between two actuation mechanisms rather than requiring the electromechanical generator to bear the full load alone during force buildup.
3Reliability
If continuous hydraulic pressure monitoring is implemented to detect leakage losses, then braking force sufficiency is ensured, but the device complexity increases
Solution Approach 1:
The electromechanical force generator acts as an intermediary that can directly compensate for hydraulic pressure losses without requiring complex monitoring systems. By detecting the position and force contribution of the electromechanical generator, the control device can infer hydraulic system status and adjust the electromechanical compensation accordingly, eliminating the need for separate hydraulic pressure sensors and monitoring circuitry.
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 approach shortens the transfer duration, reduces the load on the braking apparatus, and eliminates the need for continuous hydraulic pressure monitoring by ensuring sufficient braking torque is maintained through combined hydraulic and electromechanical forces.
Implementation Method 1
The hydraulic pressure generator and the electromechanical force generator act jointly on the brake application element
Implementation Method 2
an electromechanical force generator (14), which acts by way of an actuating element (18) on the brake application element (20)
Implementation Method 3
for example a drive nut which is displaced by a spindle which is driven by means of an electric motor on the spindle in the axial direction of the spindle
Data Source
AI summary
A method for operating a braking apparatus with a service and parking brake function, which braking apparatus can be applied both in a hydraulic manner by means of a hydraulic pressure generator and by means of an electromechanical force generator. A transfer takes place from the pressure generator, which exerts the hydraulic brake application, to the force generator, which exerts the electromechanical brake application, as soon as the braking torque is active at the braking apparatus. During the transfer, the braking torque, which is applied by the hydraulic pressure generator and the braking torque which is applied by the electromechanical force generator, is at least as high as the braking torque applied solely by the hydraulic pressure generator before the transfer.