Dual Brake Circuits With Pump and Linear Actuator Redundancy
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Solution Overview
Problem
Existing brake systems for motor vehicles face challenges in maintaining braking functionalities when a brake circuit fails, as they often rely on a master brake cylinder for pressure application, which can be difficult to control and may not function effectively in the event of partial component failures.
Innovation Solution
A brake system with two independent brake circuits, one connected to a pump and the other to a linear actuator, allowing for separate and electrical pressure application to each circuit, enabling continued operation even in the event of partial failures, with the option to connect or separate the circuits using a circuit separating valve, and incorporating a master brake cylinder for fallback hydraulic operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a master brake cylinder is used to apply pressure to brake circuits, then hydraulic pressure can be generated, but control difficulty increases and reliability decreases in the event of partial component failures
Solution Approach 1:
The brake system is divided into two independent brake circuits (first and second brake circuits), each with its own pressure generation mechanism (pump and linear actuator). This segmentation allows one circuit to maintain braking functionality even if the other fails, improving reliability while enabling independent control of each circuit's pressure
Solution Approach 2:
The traditional mechanical master brake cylinder pressure application is replaced with electrical pressure generators (pump and linear actuator). This substitution enables precise electronic control of brake pressure in each circuit independently, improving both control ease and reliability through electronic pressure regulation
2Reliability
If a single brake circuit is used, then system complexity is reduced, but reliability decreases when component failures occur
Solution Approach 1:
The brake system is segmented into two independent brake circuits with separate pressure generation paths. The first brake circuit connects to the pump, while the second brake circuit connects to the linear actuator. This segmentation provides redundancy so that if one circuit or its pressure generator fails, the other circuit can still provide braking functionality
Solution Approach 2:
The circuit separating valve provides multi-functionality by enabling the brake circuits to operate independently or be connected as needed. It allows the system to adapt between redundant independent operation and integrated operation, providing versatility in system configuration while maintaining reliability
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 solution allows for independent pressure control and generation in both brake circuits, maintaining braking functionality and electronic brake force distribution, even in the event of partial failures, and reduces the need for direct hydraulic pressure application through the master brake cylinder, ensuring consistent pedal feel and system redundancy.
Implementation Method 1
selectively applying pressure to the first brake circuit by means of the pump
Implementation Method 2
selectively applying pressure to the second brake circuit by means of the linear actuator
Data Source
AI summary
A brake system comprises a linear actuator and a pump. A first brake circuit has a first plurality of wheel connections connected thereto. A second brake circuit has a second plurality of wheel connections connected thereto. An electronic control device is configured to execute instructions for electively applying pressure to the first brake circuit with the pump and selectively applying pressure to the second brake circuit with the linear actuator. A method for operating a brake system for a motor vehicle comprises selectively applying pressure is to a first brake circuit with a pump and selectively applying pressure to a second brake circuit with a linear actuator.