Vehicle Braking Control Device for Circuit Failure Compensation
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Solution Overview
Problem
Braking systems with independent hydraulic circuits face challenges in maintaining functionality and ensuring deceleration in case of circuit failures or air presence, particularly in by-wire systems and those with aged brake fluid, where conventional methods require complex electronics and vacuum sensors.
Innovation Solution
The solution involves transferring additional brake fluid volume into the second brake circuit, allowing for additional brake boosting and compensating for circuit failures or air presence by establishing a setpoint additional volume, which enables reliable deceleration without the need for a shutoff valve or vacuum sensor, using a volume conveying device like a pump or plunger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional volume is conveyed into the second brake circuit to compensate for circuit failure or air presence, then braking reliability is improved, but device complexity increases due to need for volume control mechanisms
Solution Approach 1:
The system uses the driver's own brake pedal input to automatically control the volume conveying device, eliminating the need for complex electronic control systems. The volume is conveyed based on the brake pedal travel or brake pressure, making the system self-regulating without additional sensors or controllers.
Solution Approach 2:
The patent replaces electronic control systems (vacuum sensors, complex electronics) with a mechanical control approach where the volume conveying device is directly controlled by the driver's brake pedal input through mechanical linkages or hydraulic pressure, simplifying the overall system.
2Measurement precision
If conventional methods with vacuum sensors and complex electronics are used to detect circuit failures, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the vacuum sensor and complex electronic detection systems from the braking system. Instead of using these separate components for fault detection, the system relies on the driver's brake pedal input and simple mechanical or hydraulic control mechanisms.
Solution Approach 2:
The brake pedal serves multiple functions: it both activates the braking system and controls the volume conveying device. This multi-functionality eliminates the need for separate detection systems, as the driver's input inherently provides the necessary control signals.
3Reliability
If shutoff valve is closed to isolate failed circuit before transferring volume, then reliability is improved by preventing contamination, but ease of operation worsens as driver loses direct access to brake circuit
Solution Approach 1:
Instead of closing the shutoff valve to protect the second brake circuit, the patent inverts the approach by keeping the valve open and using the driver's brake pedal input to control volume addition. This maintains driver access while achieving the same protective effect through controlled volume conveyance.
4Device complexity
If standard braking system is used without volume compensation, then device complexity is reduced, but loss of time increases due to inadequate braking performance in fault conditions
Solution Approach 1:
The system performs preliminary volume compensation by conveying additional brake fluid into the second brake circuit in advance, based on the driver's brake pedal input. This ensures that the braking system is already compensated for potential faults or air presence before braking is needed, reducing response time delays.
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 ensures minimum vehicle deceleration is maintained even in fault conditions, allowing reliable braking with reduced electronics complexity and no need for vacuum sensors, while compensating for air and circuit failures, thus enhancing system robustness and driver control.
Implementation Method 1
The hydraulic pressure ascertained with the aid of the pressure sensor in a pressure chamber of a main brake cylinder
Implementation Method 2
taking into account an elasticity variable regarding an elasticity of the second brake circuit
Data Source
AI summary
A control device for a braking system of a vehicle, with the aid of which at least one provided setpoint variable regarding a setpoint brake pressure to be set in a first brake circuit and at least one provided actual variable regarding an actual brake pressure that is present in the first brake circuit, and/or an elasticity variable regarding an elasticity of a second brake circuit of the braking system are receivable, and a default variable regarding a setpoint additional volume of a brake fluid of the second brake circuit which is in a main cylinder braking mode is establishable, by taking into account a first deviation variable of the at least one actual variable from the at least one setpoint variable, and/or a second deviation variable of the elasticity variable from a predefined setpoint elasticity variable, so that a control signal corresponding to the established default variable is outputtable to at least one volume conveying device. Moreover, also described is a method for operating a braking system for a vehicle.