Hydraulic Fallback Level Check in Power Brake Systems
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Solution Overview
Problem
Conventional power brake systems with electronic slip control face challenges in promptly identifying faults in the secondary pressure generator, leading to potential unavailability of the hydraulic fallback level, which is critical for safe braking in case of primary assembly failures.
Innovation Solution
A method to regularly check the availability of the hydraulic fallback level by electrically controlling the secondary pressure generator during normal operation, either by generating braking pressure or monitoring power consumption, without driver participation, ensuring the system's readiness for faults in the primary assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the secondary pressure generator is activated only when needed for fault recovery, then the system complexity is reduced and energy consumption is minimized, but the availability and reliability of the hydraulic fallback level cannot be ensured
Solution Approach 1:
The system performs preliminary checking of the secondary pressure generator during normal operation by periodically activating it to generate test braking pressure. This preliminary action ensures the fallback system is functional before actually needed, resolving the contradiction by maintaining reliability through advance verification without requiring complex continuous monitoring mechanisms.
Solution Approach 2:
The secondary pressure generator checks its own functionality by autonomously generating test braking pressure during normal operation. The system self-verified its availability without requiring external testing equipment or complex diagnostic systems, thus ensuring reliability while minimizing added complexity.
2Reliability
If the secondary pressure generator is continuously activated to ensure availability, then the reliability of the hydraulic fallback level is improved, but the energy consumption increases
Solution Approach 1:
Instead of continuous activation, the secondary pressure generator is activated periodically at predetermined time intervals during normal operation to perform availability checks. This periodic action maintains reliability by regularly verifying functionality while significantly reducing energy consumption compared to continuous operation.
Solution Approach 2:
The system performs partial checking by activating the secondary pressure generator only for brief test periods rather than continuous operation. This partial action is sufficient to verify availability while minimizing energy consumption, resolving the contradiction between reliability and energy use.
3Reliability
If the secondary pressure generator is activated during normal operation to check availability, then the reliability is improved, but it may interfere with normal braking functions
Solution Approach 1:
The braking system is segmented into primary and secondary pressure generators that operate independently. During availability checks, only the secondary pressure generator is activated while the primary system continues normal braking operations. This segmentation allows checking without interference with normal braking functions.
Solution Approach 2:
The control system acts as an intermediary that coordinates between the primary pressure generator (normal braking) and secondary pressure generator (availability checking). It manages the timing and operation of the secondary generator to perform checks without interfering with normal braking functions, ensuring both reliability and ease of operation.
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 method ensures the hydraulic fallback level is promptly identified and verified, ensuring safe braking even if the primary pressure generator fails, without disturbing vehicle occupants and with minimal electrical power usage, thus maintaining vehicle safety.
Implementation Method 1
a secondary or second pressure generator (30) drivable in electrically controlled fashion
Implementation Method 2
The two assemblies are brought into contact with the wheel brakes of a motor vehicle hydraulically and in parallel with one another
Data Source
AI summary
A method for checking the availability of a hydraulic fallback level in a power brake system with electronic slip control, an electronic control device, and a power brake system with electronic slip control. In normal operation, power brake systems perform braking procedures without a driver participating in building up braking pressure. A requirement for braking is detected by an electronic control device and associated with a braking pressure which is set by electrical control of the drive of a primary pressure generator. Power brake systems are often equipped with a secondary pressure generator, connected with the wheel brakes, in parallel with the primary pressure generator, which can be used to perform the building up of pressure at a hydraulic fallback level. For safety reasons, the availability of the hydraulic fallback level is checked at particular time intervals during normal braking operation of the power brake system.