Brake Plunger Piston Initialization via Dynamic Speed Control
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Solution Overview
Problem
Existing electronically slip-controllable power braking systems face challenges in initializing quickly after startup without causing noise or excessive material strain, particularly due to the need to detect end stops of the plunger piston, which is costly and time-consuming, and can result in undesirable noise and material stress.
Innovation Solution
The method involves using the actuating speed of the plunger piston, controlled by the electronic control unit, based on initial position information to minimize noise and material strain by selecting between two actuation characteristics: a reduced speed for known positions to avoid noise and strain, and a higher speed for unknown positions to expedite initialization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the plunger piston is moved rapidly to detect end stops during initialization, then the initialization duration is reduced, but noise and material strain increase
Solution Approach 1:
The actuating speed of the plunger piston is made dynamically adjustable based on the initialization state. The electronic control unit selects between a first actuating characteristic (reduced speed) and a second actuating characteristic (higher speed) depending on whether end stop positions are known or unknown, optimizing the balance between initialization speed and noise/strain generation
Solution Approach 2:
The system changes the actuating speed parameter during initialization based on detected conditions. When the plunger piston's position relative to end stops becomes known during the initialization process, the control unit transitions from higher speed to reduced speed to avoid noise and material strain while completing the initialization
2Measurement precision
If position sensors are used to detect end stops, then detection precision is improved, but device complexity and costs increase
Solution Approach 1:
The system uses its own actuation mechanism to detect end stops without external sensors. By monitoring the actuating speed and position of the plunger piston during initialization, the electronic control unit determines end stop positions through the system's inherent mechanical feedback, eliminating the need for separate position sensing components
Solution Approach 2:
The patent replaces mechanical position sensors with an electronic control method that uses motor actuation characteristics and current monitoring to detect end stop positions. The control unit evaluates electrical parameters and actuation behavior to infer position information without physical contact sensors
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 allows for rapid initialization of the power braking system without noise or increased material strain, optimizing the duration and reducing component stress while ensuring operational readiness.
Implementation Method 1
a motor (30) for actuating or driving this plunger piston (38) is provided. This motor (30) is an electric motor
Implementation Method 2
a driveshaft, whose rotational movement is converted by a downstream transmission (36) into a translational movement of plunger piston (38)
Implementation Method 3
pressure medium is displaced out of plunger work chamber (35) while building up a pressure medium pressure in brake circuits A; B
Data Source
AI summary
A method for initializing an electronically slip-controllable power braking system after a startup and an electronically slip-controllable power braking system. Power braking systems are equipped with a pressure generator for conveying pressure medium in a pressure medium circuit. The pressure generator includes a plunger unit made up of a plunger cylinder, a plunger piston, and a plunger work chamber enclosed by plunger cylinder and plunger piston. A characteristic, using which an actuation of the plunger piston is carried out by the motor during the initialization of the power braking system, is selected by the electronic control unit as a function of a piece of information present about the position of plunger piston at the start of the initialization and implemented by corresponding electronic activation of the motor.