Hydraulic Brake Pressure Peak Suppression via Torque-Speed Jump Detection
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Solution Overview
Problem
Modern hydraulic brake systems with electrically operated pressurization devices often experience pressure peaks due to the mass moment of inertia of the pressurization device, which can negatively affect the service life of hydraulic components, especially in highly redundant systems where communication delays hinder timely intervention.
Innovation Solution
A method is implemented to measure the drive resistance and speed variables of the pressurization device, calculate a quotient from these measurements, and monitor this quotient for jumps. If a jump is detected, the speed requirement of the pressurization device is reduced, and/or a hydraulic valve for pressure dissipation is actuated, thereby suppressing pressure peaks at their onset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data from system pressure sensor is evaluated and intervention is carried out in wheel pressure regulation, then pressure peaks can be avoided, but communication time delay causes regulation operations to occur too late
Solution Approach 1:
The patent calculates a quotient from torque and rotational speed measurements and monitors it for jumps as a preliminary action. This quotient monitoring detects pressure peak conditions earlier than pressure sensor evaluation alone, enabling preventive intervention before the pressure peak fully develops, thus overcoming the time delay limitation of redundant brake systems
Solution Approach 2:
The patent replaces reliance on hydraulic pressure sensor data with a measurement-based quotient calculation from motor torque and rotational speed. This substitution enables earlier detection of pressure peak conditions by using mechanical parameters that change before pressure peaks occur, bypassing the communication delay issue in redundant systems
2Productivity
If electrically operated pressurization device operates against closed valves with high system rigidity, then pressure build-up is efficient, but pressure peaks of several hundred bar arise affecting service life
Solution Approach 1:
The patent implements feedback by continuously monitoring the quotient of torque and rotational speed, and when a jump is detected indicating impending pressure peak, the control unit responds by reducing speed requirement and/or actuating pressure dissipation valves. This feedback mechanism maintains pressure build-up efficiency while preventing harmful pressure peaks from occurring
Solution Approach 2:
The patent applies preliminary anti-action by detecting jumps in the torque-speed quotient before pressure peaks fully develop, and preemptively reducing speed requirement or opening pressure dissipation valves. This preliminary counter-action prevents the harmful pressure peaks while allowing efficient pressure build-up to continue
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 effectively prevents pressure peaks from occurring in hydraulic brake systems, even in highly redundant configurations, thereby extending the service life of hydraulic components and ensuring reliable braking performance.
Implementation Method 1
pressure peaks at the level of several hundred bar can arise within a few milliseconds as a result of the mass moment of inertia of the pressurization device
Data Source
AI summary
A method for reducing pressure peaks in hydraulic brake systems comprises an electrically operated pressurization device. A drive resistance variable of the pressurization device is measured, for example the torque. A speed variable of the pressurization device is measured. A quotient of the drive resistance variable and the speed variable is calculated. The quotient is monitored for the occurrence of a jump and, in the case of a determined jump, a speed requirement of the pressurization device is reduced and/or a hydraulic valve for pressure dissipation is actuated.