Hydraulic Control Unit Master-Slave Brake Booster Communication
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Solution Overview
Problem
Existing brake systems face challenges in providing a pleasant brake actuation feel and efficient communication between hydraulic and electromechanical brake booster control devices, particularly during blending processes and in the event of functional impairments.
Innovation Solution
A master-slave design is implemented between the hydraulic control device and the brake booster control device, with faster data communication via dedicated data lines and clock synchronization, allowing the hydraulic control device to take on a master status and the brake booster control device to adapt quickly to driver inputs, ensuring seamless operation and maintaining braking comfort even in case of failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional data bus (CAN, I2C, or Flexray) is used for communication between hydraulic control device and brake booster control device, then device complexity is reduced and ease of manufacture is improved, but communication speed is insufficient and response time is delayed
Solution Approach 1:
The communication system is segmented into two parts: a high-speed dedicated data line for critical real-time communication between control devices, and a conventional data bus for non-critical data. This segmentation allows critical communications to achieve high speed while non-critical communications use the simpler conventional bus, resolving the contradiction between speed and complexity.
Solution Approach 2:
A dedicated data line acts as an intermediary communication channel between the hydraulic control device and brake booster control device. This intermediary provides a direct high-speed pathway for critical data exchange, bypassing the limitations of conventional data buses while maintaining system modularity.
2Ease of operation
If the brake booster control device operates independently without master-slave coordination, then device complexity is reduced, but braking comfort and adaptation to driver inputs deteriorate during blending processes
Solution Approach 1:
The control system implements dynamic master-slave role assignment where the hydraulic control device acts as master and the brake booster control device acts as slave during blending processes. This dynamic coordination allows the system to adapt to driver inputs smoothly while maintaining braking comfort, with the master device coordinating the slave device's responses to ensure pleasant pedal feel.
3Loss of time
If faster communication is implemented between control devices, then response time to driver inputs is improved, but production costs increase due to additional hardware requirements
Solution Approach 1:
The communication system is segmented into two parts: a high-speed dedicated data line for critical real-time communication between control devices, and a conventional data bus for non-critical data. This segmentation allows critical communications to achieve high speed while non-critical communications use the simpler conventional bus, resolving the contradiction between speed and complexity.
Solution Approach 2:
High-speed communication capability is applied locally only where it is critically needed - specifically for direct communication between the hydraulic control device and brake booster control device during blending processes. Other parts of the system continue to use conventional communication methods, thus achieving performance improvement where necessary while controlling overall production costs.
Data Source
AI summary
A hydraulic control device for at least one hydraulic aggregate of a brake system, and a brake booster control device, interacting therewith, for an electromechanical brake booster of the brake system. The hydraulic control device includes a first control electronics by which at least one motor target quantity that is to be realized by a motor of the electromechanical brake booster can be determined, taking into account a provided brake actuating strength quantity relating to a current actuation of a brake actuating element, and by which a specification signal corresponding to the at least one determined motor target quantity can be outputted to the brake booster control device. The brake booster control device has a second control electronics that, at least in a normal mode, outputs the control signal to the motor of the electromechanical brake booster, taking into account the specification signal outputted by the hydraulic control device.