Vehicle Braking Control Device Redundancy via Signal Suitability Determination
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Solution Overview
Problem
Existing braking control devices for vehicles require complex configurations with multiple sensors and hydraulic pressure control devices to ensure reliability, which complicates the system and increases the number of sensors needed.
Innovation Solution
A braking control device that uses operational displacement and operation force sensors to adjust hydraulic pressure in wheel cylinders, with a communication bus to transmit signals between hydraulic pressure units, allowing for suitability determination and redundant operation to ensure reliability with a simple configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensors and hydraulic pressure control devices are provided to improve reliability, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent merges the functions of multiple sensors into a single sensor by implementing redundancy at the signal processing level. The operational displacement sensor's signal is routed through two separate signal lines (first displacement signal line and second displacement signal line) to two different hydraulic pressure control units, allowing one unit to take over when the other fails without requiring duplicate sensors.
Solution Approach 2:
The patent segments the control system into two independent hydraulic pressure control units (first and second ECU) that can operate independently. Each unit has its own processing path for the sensor signal, allowing fault isolation where a failure in one unit does not affect the other, maintaining system reliability without proportional increase in overall complexity.
2Reliability
If multiple hydraulic pressure control devices are provided for backup control, then the reliability is improved, but the number of sensors required increases
Solution Approach 1:
The single operational displacement sensor serves multiple functions by providing its signal to both the first and second hydraulic pressure control units through separate signal lines. This multi-functional use of the sensor allows the system to maintain redundancy and reliability without requiring additional sensors, as one sensor fulfills the detection needs for both control units.
3Quantity of substance
If a single sensor is used with multiple hydraulic pressure control units, then the sensor quantity is reduced, but the signal transmission complexity increases
Solution Approach 1:
The patent introduces a communication bus as an intermediary that manages signal transmission between the hydraulic pressure control units and other system components. This standardized communication interface simplifies the overall signal transmission architecture by providing a common protocol and pathway for data exchange, reducing the complexity that would otherwise arise from direct point-to-point connections.
Data Source
AI summary
A braking control device comprises: an operational displacement sensor detecting operational displacement of a braking member; a first hydraulic pressure unit that reads operational displacement as a first displacement processing value via a first displacement signal line and adjusts braking hydraulic pressure based on the first displacement processing value; a second hydraulic pressure unit that reads operational displacement as a second displacement processing value via a second displacement signal line and adjusts braking hydraulic pressure based on the second displacement processing value; and a communication bus transmitting signals between the first and second hydraulic pressure units. The first hydraulic pressure unit acquires the second displacement processing value via the communication bus and determines suitability/unsuitability of the first displacement processing value. When the first displacement processing value is suitable (unsuitable), the first hydraulic pressure unit adjusts the braking hydraulic pressure on the basis of the first (second) displacement processing value.