Compact Hydraulic Brake Control for Automated Vehicles
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Summary
Problems
Current brake systems for semi-automated and fully automated driving require redundant components to ensure braking functionality without driver input, but face challenges with high valve effort, risk of brake failures due to dirt particles, and complex packaging constraints, especially in compact designs.
Innovation solutions
A modular, cost-effective 1-box solution integrating a pressure supply device, solenoid valves, electronic control unit, reservoir, and pedal stroke sensors within a single module, with redundant seals and electrical connections, allowing for efficient pressure control and reduced risk of failure, while maintaining a compact and lightweight design.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a hydraulic connection between master brake cylinder and pedal feel simulator is provided, then braking force transmission is improved, but complexity of the control device increases due to multiple valves and hydraulic pathways
Why choose this principle:
The patent introduces a control unit as an intermediary that coordinates the operation of multiple valves (first switching valve, second switching valve, controlled outlet valve) to manage hydraulic flow between the master brake cylinder, pedal feel simulator, and brake circuits. This centralized control logic simplifies the overall system architecture by providing a unified control strategy rather than requiring complex mechanical linkages between all components.
Principle concept:
If a hydraulic connection between master brake cylinder and pedal feel simulator is provided, then braking force transmission is improved, but complexity of the control device increases due to multiple valves and hydraulic pathways
Why choose this principle:
The hydraulic system is segmented into distinct functional modules: the master brake cylinder unit, the pedal feel simulator unit, the brake circuits, and the pressure supply device. Each module can be controlled independently through specific valves, allowing for simplified design and maintenance of each segment while achieving complex overall functionality through coordinated operation.
Application Domain
Data Source
AI summary:
A modular, cost-effective 1-box solution integrating a pressure supply device, solenoid valves, electronic control unit, reservoir, and pedal stroke sensors within a single module, with redundant seals and electrical connections, allowing for efficient pressure control and reduced risk of failure, while maintaining a compact and lightweight design.
Abstract
The invention relates to an actuating device for a fully or partially hydraulically actuated braking system for a vehicle, comprising a master brake cylinder (HZ) with a piston-cylinder unit having a piston and a working chamber, wherein the working chamber is hydraulically connected or connectable to a reservoir (VB) and a pedal feel simulator and is mechanically connected via an actuating device, in particular a brake pedal, and the working chamber is connectable to at least one brake circuit (BK1, BK2) via at least one normally open valve (FV), and that at least one hydraulically actuated wheel brake (RB) assigned to a brake circuit (BK1, BK2) is assigned to each of which at least one controllable switching valve (SV) is assigned, with which the wheel brake (RB) can be connected to the respective brake circuit (BK1, BK2) for pressure build-up (pauf) and pressure release (pab), in particular in brake air booster operation.wherein a pressure supply (DV1) driven by an electric motor (2), the piston of which is adjustable in the cylinder by means of the electric motor (2), and at least one valve arrangement (HCU) with solenoid valves for wheel-specific pressure control, as well as at least one electrical control unit (ECU) for controlling at least valves of the valve arrangement (ECU) and the motor of the pressure supply (DV!), wherein at least one controlled outlet valve (AV), through which hydraulic medium can be directly discharged, especially in normal operation (ABS), from the respective wheel brake (RB) or the brake circuit (BK1, BK2) into the reservoir (VB), and wherein the valve arrangement (ECU) and the hydraulic component of the pressure supply (DV) are arranged in a housing (A) and the master brake cylinder (HZ) is arranged in a separate housing (C).