Brake Pressure Generator Control to Reduce Test Noise and Wear
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Solution Overview
Problem
Existing brake systems generate noise and vibrations during testing operations, leading to wear and potential damage to components, as the pressure generator is actuated in a jerky manner.
Innovation Solution
A logistical growth function is used to smoothly increase and stabilize the setpoint value for the pressure generator, preventing jerky movements by gradually increasing the pressure, thereby minimizing noise and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure generator is actuated in a jerky manner during testing operations, then the testing operation can be performed, but noise and vibrations are generated leading to wear and potential damage to components
Solution Approach 1:
The patent applies parameter changes by using a logistical growth function to smoothly vary the setpoint value for pressure over time. Instead of applying pressure in jerky steps, the system gradually increases pressure according to a mathematical function, changing the pressure parameter continuously to avoid sudden movements and reduce noise and vibrations during testing operations
Solution Approach 2:
The patent implements beforehand cushioning by pre-smoothing the setpoint value using a logistical growth function before the pressure generator actsuates. This anticipatory smoothing prevents jerky movements from occurring in the first place, cushioning the system against sudden pressure changes that would generate noise, vibrations, and wear during testing
2Productivity
If the setpoint value is increased stepwise, then the testing operation is efficient, but the pressure generator moves in a jerky manner causing wear and noise
Solution Approach 1:
The patent transforms the discrete stepwise setpoint value into a continuous smoothly varying setpoint using a logistical growth function. This parameter transformation maintains the efficiency of structured testing while eliminating the jerky movements that cause wear, allowing the pressure generator to move smoothly through the testing range without energy loss to friction and mechanical stress
Data Source
AI summary
A method for operating a brake system of a motor vehicle. The brake system includes a master brake cylinder operable by a user and a pressure generator driven by an electric motor, for generating a hydraulic system pressure, and includes at least one hydraulically operable friction brake. On the inlet side, the at least one friction brake is assigned a proportioning valve acted upon by the system pressure, to adjust a hydraulic actuating pressure for the friction brake. The pressure generator is given a setpoint value for carrying out a testing operation. The setpoint value is selected so as to be smoothed by a logistical growth function.