Hydraulic Brake Boost Control Under Slip Control Signal Failure
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Solution Overview
Problem
Hydraulic vehicle brake systems with slip control face issues when electrical or electronic signals fail, leading to a double boost in braking force due to simultaneous operation of the brake booster and slip control system, making controlled braking difficult or impossible.
Innovation Solution
Implementing redundant hydraulic function signals transmitted via existing brake lines to regulate or reduce the boost to the braking force, using controllable brake boosters and power brake pressure generators, ensuring independent operation of these components based on hydraulic signals even in electronic failure scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the brake booster and slip control system both boost the braking force simultaneously, then the braking force is increased, but controlled braking becomes difficult or impossible
Solution Approach 1:
The system uses hydraulic function signals as feedback to monitor the operational state of the brake booster and slip control system. When an electronic failure is detected, the hydraulic signal provides information about the actual braking force generation, enabling the control system to adjust or reduce the boost from one component to maintain controllable braking.
Solution Approach 2:
The system dynamically adjusts the braking force boost based on the operational status detected through hydraulic function signals. The brake booster or slip control system can modulate or reduce their boost contribution in real-time to prevent double-boosting while maintaining sufficient braking force for controlled operation.
2Force
If the hydraulic pump of the slip control system boosts the braking force when the brake booster is functional, then the braking force is increased, but the system complexity increases due to error-related double boost
Solution Approach 1:
The hydraulic function signal acts as an intermediary communication medium between the brake booster and slip control system. This hydraulic signaling mechanism provides a reliable way to exchange operational status information without relying solely on electrical signals, enabling the system to detect failures and coordinate the operation of both components to avoid uncontrolled double-boosting.
Solution Approach 2:
The hydraulic system serves multiple functions: it transmits braking force, transmits function signals for status communication, and enables failure detection. By using the existing hydraulic infrastructure for both power transmission and information communication, the system avoids adding separate complex signaling systems while maintaining the ability to prevent double-boosting.
3Reliability
If separate hydraulic lines are added for transmitting function signals, then the reliability of signaling is improved, but the device complexity increases
Solution Approach 1:
The existing hydraulic lines are used for dual purposes: transmitting braking force and transmitting function signals. By modulating the hydraulic pressure or flow in the existing brake lines to encode function signals, the system achieves reliable communication without adding separate hydraulic infrastructure, thus maintaining reliability while avoiding increased complexity.
Solution Approach 2:
The system merges the power transmission function and information communication function into a single hydraulic medium. The brake fluid lines simultaneously carry the hydraulic pressure for braking and encode operational status information through pressure modulations or flow patterns, eliminating the need for separate signaling lines.
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
Prevents double boosting of braking force, enabling controlled braking by regulating brake pressure through redundant hydraulic signaling, thus maintaining system functionality and safety.
Implementation Method 1
a hydraulic pump, which may likewise boost the braking force in the event of a failure of the brake booster
Implementation Method 2
The hydraulic function signal is preferably transmitted in addition to an electrical or electronic function signal, it being possible to transmit the hydraulic function signal via existing brake lines and brake-fluid-conducting bores in the vehicle brake system
Data Source
AI summary
So that an impermissibly high brake pressure in a hydraulic power vehicle brake system (1) having a slip control system (9) is prevented in the event of an error, the invention proposes hydraulic function signals (14, 15), upon the presence of which the generation of a brake pressure or a boost to the brake pressure is reduced if an electronic function signal of a power brake pressure generator (2, 10) is absent.