Vehicle Brake Pressure Generator with Dual Pump Segmentation
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Solution Overview
Problem
Conventional vehicle brake systems face challenges in meeting the increasing demand for brake fluid volume during dynamic braking processes, leading to higher drive power and construction requirements, which increase costs and weight.
Innovation Solution
An electronically slip-controllable vehicle brake system employs electronically controllable pressure medium valves, allowing for variable control of pressure medium delivery by adjusting the operation of two pumps, with one pump idling through a throttle point when sufficient pressure is reached, reducing overall drive power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the delivery volume of pressure generators is increased to meet higher brake fluid volume requirements during dynamic braking, then the braking performance is improved, but the drive power, construction volume, weight, and cost increase significantly
Solution Approach 1:
The system divides the pressure generation function into two separate pumps instead of using one large pump. Each pump has a smaller drive motor, but together they can deliver the required brake fluid volume. The pumps operate independently with individual drive units, allowing the system to meet high volume requirements without requiring a single large, powerful motor.
Solution Approach 2:
The system dynamically adjusts which pumps operate and how they operate based on real-time braking demands. During high-demand situations, both pumps operate at full capacity. During lower-demand periods, one pump can idle or operate at reduced capacity, allowing the drive motors to be smaller while still meeting peak requirements.
2Productivity
If the delivery volume of pressure generators is increased to meet higher brake fluid volume requirements, then the braking performance is improved, but the construction volume and weight of the drive motor increase
Solution Approach 1:
The drive motor function is segmented into two separate smaller motors, one for each pump. Each motor only needs to provide sufficient power for its assigned pump, rather than one motor needing to provide power for the entire system's maximum demand. This results in reduced total weight while maintaining the required delivery volume capability.
3Productivity
If the delivery volume of pressure generators is increased to meet higher brake fluid volume requirements, then the braking performance is improved, but the system cost increases significantly
Solution Approach 1:
The system uses two standard-sized pumps with standard drive motors rather than one custom-designed large pump with a large motor. This segmentation allows the use of off-the-shelf components, reducing development costs and manufacturing complexity while achieving the required performance through parallel operation.
4Adaptability or versatility
If conventional pressure generators are used with fixed delivery volume, then the system design is simpler, but the system cannot adapt to varying braking demands efficiently
Solution Approach 1:
The system incorporates electronic control that dynamically adjusts pump operation based on real-time braking demands. The control system monitors brake fluid requirements and activates or deactivates pumps accordingly, allowing the system to adapt from high-volume emergency braking to low-volume normal operation. This dynamic control adds complexity but enables efficient adaptation to varying demands.
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 design enables a more compact, lighter, and cost-effective brake system by optimizing the delivery volume of the pressure generator unit, adapting to varying braking demands and reducing the load on the drive motor, while also improving noise damping measures.
Implementation Method 1
pressure medium valves, which can be actuated by a magnetic actuator or by a piezoelectric actuator
Implementation Method 2
pressure medium valves, which can be actuated by a magnetic actuator or by a piezoelectric actuator
Implementation Method 3
two pumps per brake circuit feed into a common pressure line
Data Source
Figure 1
AI summary
The invention relates to a hydraulic vehicle brake system having at least one brake circuit (10) and one wheel brake (16) and having a pressure-generating unit (30) for supplying this wheel brake (16) with pressure medium which is under brake pressure or for adapting the brake pressure to the slip conditions of a wheel which is assigned to the wheel brake (16). The object of the invention is to propose a pressure-generating unit (30) whose pressure medium feed volume can be controlled according to demand. The object of the invention is to propose a pressure-generating unit (30) whose pressure medium feed volume can be controlled according to demand. The invention proposes for this purpose a pressure-generating unit (30) which comprises at least two pumps (30a, 30b) which feed into a common pressure line (42), and in addition electronically actuated means (52) for controlling a pressure medium connection (50) from the pressure line (42) to a suction side of at least one of the pumps (30a, 30b) as a function of the pressure medium volume demand.