Vehicle Braking Control Device Suitability Diagnosis
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Solution Overview
Problem
Existing braking control devices for vehicles lack accuracy in suitability determination and redundancy, particularly in diagnosing abnormal states such as gas introduction, seal defects, and electromagnetic valve malfunctions.
Innovation Solution
A braking control device that adjusts hydraulic pressure in a wheel cylinder based on a braking operation, utilizing a master unit with a master cylinder, servo chamber, and reaction force chamber, along with a regenerative coordination unit and electromagnetic valves, controlled by a controller to determine suitability and manage malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If abnormality diagnosis is executed based on reaction force hydraulic pressure and stroke information, then suitability determination can be performed, but accuracy of suitability determination is insufficient
Solution Approach 1:
The diagnosis system is segmented into multiple independent diagnosis units, each responsible for diagnosing specific components (master cylinder, electromagnetic valves, etc.). Each unit uses dedicated sensors and evaluation criteria, allowing parallel execution of multiple diagnosis processes without interference, thereby improving overall determination accuracy while maintaining information completeness.
Solution Approach 2:
The controller integrates multiple diagnosis functions into a single system that can simultaneously evaluate the master cylinder, electromagnetic valves, and fluid passages. The system uses a unified approach combining reaction force hydraulic pressure, input hydraulic pressure, and stroke information to perform comprehensive suitability determination across all braking components.
2Measurement precision
If multiple sensors and diagnosis units are added to improve diagnosis accuracy, then suitability determination accuracy improves, but device complexity increases
Solution Approach 1:
The controller serves multiple functions: it controls the electromagnetic valves, monitors hydraulic pressures from sensors, executes diagnosis routines, and determines suitability. By making the controller multi-functional, the system achieves high diagnosis accuracy without adding separate dedicated control units, thereby limiting the increase in device complexity.
Solution Approach 2:
The diagnosis functions for the master cylinder, electromagnetic valves, and fluid passages are merged into a single integrated diagnosis system. Multiple sensors (reaction force pressure sensor, input pressure sensor) are combined and processed by one controller that executes coordinated diagnosis routines, reducing the complexity that would arise from separate independent diagnosis systems.
3Reliability
If the system continuously monitors hydraulic pressure and stroke information for diagnosis, then reliability of braking control improves, but use of energy increases
Solution Approach 1:
The diagnosis system executes monitoring and evaluation at periodic intervals rather than continuously. The controller performs diagnosis routines at predetermined timing, evaluating the collected hydraulic pressure and stroke information periodically. This periodic action maintains braking control reliability through regular monitoring while significantly reducing energy consumption compared to continuous monitoring.
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
Improves accuracy of suitability determination and ensures redundancy by effectively diagnosing and managing malfunctions, ensuring continuous and reliable braking performance.
Implementation Method 1
a reaction force hydraulic pressure sensor (PS) configured to detect a hydraulic pressure in the reaction force chamber (Ro) as a reaction force hydraulic pressure (Ps)
Implementation Method 2
an input hydraulic pressure sensor (PN) configured to detect a hydraulic pressure in the input cylinder (CN) as an input hydraulic pressure (Pn)
Implementation Method 3
a first adjustment unit (YC) configured to adjust a hydraulic pressure generated by a first electric motor (MC, MZ, MD) to a first hydraulic pressure (Pc)
Data Source
AI summary
A braking control device includes a first adjustment unit, a master unit, a regenerative coordination unit, a first opening/closing valve, a second opening/closing valve, a reaction force hydraulic pressure sensor, an input hydraulic pressure sensor, a controller. The master unit includes a master cylinder and a master piston, a master chamber, a servo chamber, and a reaction force chamber. The regenerative coordination unit includes an input piston. The first opening/closing valve provided in a first fluid passage. The second opening/closing valve provided in a second fluid passage. The reaction force hydraulic pressure sensor detects a pressure in the reaction force chamber. The input hydraulic pressure sensor detects a pressure in the input cylinder.The controller determines, based on the reaction force hydraulic pressure and the input hydraulic pressure, suitability of at least one of the master unit, the regenerative coordination unit, the first opening/closing valve, and the second opening/closing valve.