Plunger Unit Pressure Control for Brake Volume Replenishment
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Solution Overview
Problem
Conventional electronically slip-controllable power braking systems face limitations in volume capacity and efficiency, particularly in managing pressure medium replenishment, which can impair vehicle stability and deceleration during braking, especially when dealing with higher-performance wheel brakes.
Innovation Solution
The method involves optimizing the plunger unit's design to enhance its compactness and efficiency by implementing a pressure/volume characteristic curve management system, allowing for more successive pressure buildup procedures before needing volume replenishment, and enabling its use in vehicles with higher-performance wheel brakes without a larger-dimensioned plunger unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the plunger unit is downsized to reduce volume and cost, then the volume capacity and operating time are reduced, but material costs and device complexity are decreased
Solution Approach 1:
The control method performs preliminary actions by optimizing the pressure buildup and pressure reduction cycles in advance. The system executes multiple pressure buildup procedures before replenishment is needed by carefully managing the plunger unit's strokes and ensuring complete pressure medium utilization, thereby extending operating time despite reduced volume capacity
Solution Approach 2:
The invention changes operational parameters including pressure levels, volume thresholds, and stroke sequences to maximize the efficiency of a downsized plunger unit. By adjusting these parameters, the system achieves extended operating cycles without requiring a larger physical volume
2Ease of manufacture
If the plunger unit is downsized to reduce material costs, then the pressure medium volume capacity is reduced, but manufacturing costs are decreased
Solution Approach 1:
The control method ensures continuous useful action by optimizing each pressure buildup and reduction cycle to fully utilize the available pressure medium volume. The system maintains continuous operational efficiency through coordinated valve control and plunger stroke management, maximizing the utility of reduced pressure medium capacity
Solution Approach 2:
The system applies partial action principles by performing multiple successive pressure buildup procedures that collectively achieve the required braking effect without requiring the full volume capacity that would be needed for a single high-power operation, thereby reducing material requirements while maintaining effectiveness
3Duration of action of moving object
If multiple successive pressure buildup procedures are performed, then the operating time extends, but the pressure medium volume is depleted faster
Solution Approach 1:
The invention implements periodic action through structured sequences of pressure buildup and pressure reduction procedures. The control unit coordinates these periodic cycles to ensure that multiple successive pressure buildup operations can be performed while systematically managing pressure medium consumption, thereby extending operating time despite limited volume capacity
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 extends the operating time before necessary pressure medium replenishment, maintains vehicle stability, and reduces material and parts costs by downsizing the hydromechanical design of the plunger unit, making it more cost-effective and adaptable for various braking systems.
Implementation Method 1
The volume replenishment of the working chamber takes place following a completed setting of a specified setpoint brake pressure by the plunger unit. For this purpose, the plunger piston is driven in a pressure reducing direction without this having an effect on the brake pressure
Data Source
AI summary
A method for controlling an electronically slip-controllable power braking system of a motor vehicle. Power braking systems are equipped with a plunger unit, which includes a plunger piston accommodated in a plunger cylinder and delimiting a working chamber, for generating brake pressure in brake circuits. This plunger piston is actuatable by an electronically activatable drive in a pressure buildup direction or in the opposing spatial direction thereto in a pressure reducing direction. A time-limited drive of the plunger piston takes place in the pressure reducing direction as soon as an actual brake pressure generated by the plunger unit has reached a predefinable setpoint brake pressure and a decoupling of a wheel brake and the plunger unit from an associated brake circuit has taken place.