Brake Pressure Control Using Synchronous Actuator-Pump Operation
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Solution Overview
Problem
Modern brake systems with a direct mechanical connection between the driver and wheel brakes are unable to build up brake pressure quickly enough when rapid braking demands are made, leading to increased braking distances, especially at high speeds.
Innovation Solution
A method where a braking request signal is monitored, and if the rate of change exceeds a threshold, the linear actuator and hydraulic pump are switched into synchronous operation to rapidly build up brake pressure by simultaneously conveying hydraulic volume into the wheel brake, with the option to connect them in series or parallel, and controlled by separate units for redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional brake system with direct mechanical connection is used, then the brake pressure builds up quickly, but the system cannot meet the rapid pressure build-up requirement when braking demand increases very rapidly at high speeds
Solution Approach 1:
The patent combines two pressure application devices (linear actuator and hydraulic pump) into a single brake system. The linear actuator provides initial pressure build-up, and the hydraulic pump provides additional pressure intensification. When the rate of change of the braking request signal exceeds a threshold, both devices operate simultaneously in synchronous operation to deliver hydraulic volume into the wheel brake, achieving rapid pressure build-up and reducing braking distance.
2Productivity
If two pressure application devices operate simultaneously, then the brake pressure builds up quickly, but the control system complexity increases
Solution Approach 1:
The control system monitors the rate of change of the braking request signal and uses this feedback to determine when synchronous operation is required. When the rate of change exceeds a predetermined threshold, the control unit activates both the linear actuator and hydraulic pump simultaneously. This feedback-based control strategy simplifies the overall control logic while enabling rapid pressure build-up when needed.
Solution Approach 2:
The system dynamically switches between different operating modes: normal operation using only the linear actuator, and synchronous operation using both the linear actuator and hydraulic pump. The transition between modes is triggered by the rate of change of the braking request signal, allowing the system to optimize performance based on real-time braking demands while maintaining simple control logic.
3Stress or pressure
If the linear actuator and hydraulic pump are connected in series, then the hydraulic pressure is intensified, but the system requires higher pressure generation capability
Solution Approach 1:
The pressure generation function is segmented between two devices: the linear actuator generates initial hydraulic pressure, and the hydraulic pump provides additional pressure intensification. In series connection, the output of the linear actuator feeds into the hydraulic pump, creating a staged pressure build-up process. This segmentation allows each device to operate within its optimal pressure range while achieving high overall brake pressure.
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 allows for quick achievement of requested brake pressure, reducing the braking distance of motor vehicles by ensuring rapid pressure build-up and maintaining functionality even in case of control unit failure.
Implementation Method 1
the linear actuator and the hydraulic pump are operated simultaneously to convey hydraulic volume into at least one wheel brake in order to build up a brake pressure in the wheel brake
Implementation Method 2
the linear actuator and the hydraulic pump are operated simultaneously to convey hydraulic volume into at least one wheel brake
Implementation Method 3
a hydraulic pressure generated by the linear actuator is further intensified by the hydraulic pump
Data Source
AI summary
A method for controlling a brake system comprises a linear actuator and a hydraulic pump. For a rapid pressure build-up, the linear actuator and the hydraulic pump are switched into synchronous operation at a rate of change of the braking request signal greater than a threshold value. The embodiments also relates to a brake system for motor vehicles.