Vehicle Brake System Residual Slippage Torque Suppression
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Solution Overview
Problem
Conventional vehicle braking systems with both hydraulic and electromechanical actuation face issues with residual slippage torques due to incomplete rollback function during electromechanical actuation, as hydraulic pressure-induced deformation is lacking, leading to incomplete braking action and increased wear.
Innovation Solution
The system builds up hydraulic pressure in the disc-brake device when disengaging the parking-brake function, simulating hydraulic service braking to elastically deform the hydraulic sealing elements, ensuring the actuating piston returns to its initial position and preventing residual slippage torques, using a control device to manage this process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electromechanical actuation is used for parking brake function, then the parking brake can be activated without hydraulic pressure, but residual slippage torques remain due to incomplete rollback function
Solution Approach 1:
Before disengaging the parking brake electromechanically, hydraulic pressure is built up in advance to deform the hydraulic sealing elements. This preliminary hydraulic action ensures that when the electromechanical actuator retracts the actuating piston, the deformed sealing elements provide sufficient holding forces to maintain complete rollback and prevent residual slippage torques.
Solution Approach 2:
The invention introduces hydraulic pressure into the disc-brake device specifically during the disengagement phase of electromechanical parking brake actuation. This hydraulic pressure deforms the hydraulic sealing elements (such as piston seals or cup seals) to increase their holding forces, enabling complete rollback of the actuating piston and elimination of residual slippage torques.
2Force
If hydraulic pressure is applied during service braking, then complete braking action is achieved, but the system cannot suppress residual slippage torques during electromechanical parking brake disengagement
Solution Approach 1:
Before disengaging the parking brake electromechanically, hydraulic pressure is built up in advance to deform the hydraulic sealing elements. This preliminary hydraulic action ensures that when the electromechanical actuator retracts the actuating piston, the deformed sealing elements provide sufficient holding forces to maintain complete rollback and prevent residual slippage torques.
Solution Approach 2:
The invention introduces hydraulic pressure into the disc-brake device specifically during the disengagement phase of electromechanical parking brake actuation. This hydraulic pressure deforms the hydraulic sealing elements (such as piston seals or cup seals) to increase their holding forces, enabling complete rollback of the actuating piston and elimination of residual slippage torques.
3Stability of the object's composition
If the hydraulic seal adhering contact is relied upon for rollback function, then the actuating piston can return to initial position, but the holding forces are insufficient during electromechanical actuation without hydraulic pressure
Solution Approach 1:
The invention changes the physical state of the hydraulic sealing elements by applying hydraulic pressure during parking brake disengagement. This pressure causes elastic deformation of the sealing elements, fundamentally altering their mechanical properties and increasing their holding forces from the original insufficient level to a level adequate for complete rollback and suppression of residual slippage torques.
Solution Approach 2:
The invention introduces hydraulic pressure into the disc-brake device specifically during the disengagement phase of electromechanical parking brake actuation. This hydraulic pressure deforms the hydraulic sealing elements (such as piston seals or cup seals) to increase their holding forces, enabling complete rollback of the actuating piston and elimination of residual slippage torques.
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 effectively suppresses residual slippage torques in all operating modes, enhancing braking functionality while maintaining low production costs by ensuring the actuating piston returns to its initial position, thus preventing wear and improving braking efficiency.
Implementation Method 1
a hydraulic pressure that is of sufficient magnitude to deform hydraulic sealing elements in the disc-brake device in a manner corresponding to an elastic deformation during a service braking is built up
Data Source
AI summary
A vehicle brake system having a hydraulically actuatable disc brake device which has an electromechanical operating device for activating a parking brake function, wherein the vehicle brake system has a hydraulic circuit with a hydraulic pressure source and also has activatable hydraulic functional elements in order to hydraulically actuate the disc brake device in accordance with a service braking action by a driver or an automatic activation, wherein the vehicle brake system also has a control device in order to actuate the electromechanical operating device in accordance with a parking braking action by the driver or an automatic activation of the parking brake function. Here, to avoid residual slippage torques, it is provided that the hydraulic circuit can be actuated by the control device such that, upon the triggering of the parking brake function through actuation of the electromechanical operating device, a hydraulic pressure is built up in the disc brake device, which hydraulic pressure is large enough to elastically deform hydraulic seal elements in the disc brake device corresponding to an elastic deformation during a service braking operation.