Electrohydraulic Brake Control Device Sensor Segmentation
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Solution Overview
Problem
Existing electrohydraulic motor vehicle control devices face issues with sensor signal interference due to proximity to magnetic fields and require complex gear mechanisms for mechanical transmission, leading to increased costs and space constraints.
Innovation Solution
The electrohydraulic motor vehicle control device features a hydraulic unit with electrically activated valves and a brake-pedal-activated master cylinder, where an electric motor drives a hydraulic pressure source, and sensor elements are placed on a separate printed circuit board closer to the hydraulic unit, utilizing an eddy current measuring principle to minimize magnetic interference and reduce complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sensor elements are arranged on the electronic control unit opposite the electric motor, then the sensors can be integrated into the control unit, but the sensor signals are disrupted by magnetic fields from the valves and the installation space is limited
Solution Approach 1:
The sensor system is segmented into a separate evaluation unit with its own printed circuit board, positioned adjacent to the electric motor rather than integrated into the control unit opposite the motor. This segmentation allows the sensors to be physically closer to the motor for direct measurement while separating the sensor evaluation electronics from the valve control electronics, eliminating magnetic interference and signal disruption while maintaining integration benefits
Solution Approach 2:
A separate evaluation unit acts as an intermediary between the sensor elements and the main control unit. This intermediate component receives sensor signals directly at the motor side, processes them locally, and then transmits the processed information to the control unit, thereby isolating the sensitive sensor signals from the magnetic fields generated by the valve coils in the control unit
2Ease of operation
If a gear mechanism is provided for mechanical transmission of motor rotation, then the motor position can be transmitted to the control unit, but the system becomes complex and expensive
Solution Approach 1:
The mechanical gear transmission system is replaced with an electrical/electronic solution. Sensor elements positioned adjacent to the electric motor directly detect motor position and rotational information, which are then transmitted as electrical signals to the evaluation unit and control unit. This substitution eliminates the need for complex mechanical gears, reduces system complexity and cost, while maintaining accurate motor position transmission capability
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 arrangement reduces sensor signal disruption, saves space, and eliminates the need for complex gear mechanisms, resulting in a cost-effective and compact brake-by-wire system with improved accuracy and reliability.
Implementation Method 1
utilizing an eddy current measuring principle to minimize magnetic interference and reduce complexity
Implementation Method 2
utilizing an eddy current measuring principle to minimize magnetic interference and reduce complexity
Implementation Method 3
an electric motor for driving an electrically controllable, hydraulic pressure source
Implementation Method 4
a hydraulic unit with electrically activated valves and a brake-pedal-activated master brake cylinder
Data Source
AI summary
An electrohydraulic motor vehicle control device, in particular for a motor vehicle brake system, including a hydraulic unit with electrically activated valves and a brake-pedal-activated master brake cylinder, an electronic control unit which comprises a first printed circuit board with electrical and/or electronic components for actuating the valves, and an electric motor for driving an electrically controllable, hydraulic pressure source which is arranged on a first side face of the hydraulic unit, wherein a second printed circuit board is provided which is arranged in a region of the first side face of the hydraulic unit, wherein a first sensor element for sensing activation of a brake pedal is arranged on the second printed circuit board.