Braking Device Failure Diagnosis via Hydraulic Segmentation
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Solution Overview
Problem
Conventional braking devices cannot accurately determine the source of failures in hydraulic pressure detecting units and cutoff valves, leading to inadequate braking control.
Innovation Solution
A braking device with operation quantity detecting units, hydraulic pressure sources, cutoff valves, and hydraulic pressure detecting units that perform mutual diagnoses in both opening and closing command states to differentiate between failures in cutoff valves and hydraulic pressure detecting units, allowing for specific failure identification and adaptive braking control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic pressure detecting units and cutoff valves are installed in each hydraulic passage for failure diagnosis, then failure detection capability is improved, but the ability to specify the exact failure source remains insufficient
Solution Approach 1:
The hydraulic system is divided into multiple independent hydraulic passages, each equipped with its own cutoff valve and hydraulic pressure detecting unit. This segmentation allows individual monitoring and control of each passage, enabling precise identification of which specific passage or component has failed by isolating and diagnosing each segment separately.
Solution Approach 2:
Hydraulic pressure detecting units continuously monitor the pressure in each hydraulic passage and provide feedback signals to the control unit. The control unit analyzes this feedback information to determine the operational state of cutoff valves and detecting units, enabling real-time failure source identification through comparative analysis of pressure data from multiple passages.
2Measurement precision
If mutual diagnosis is performed in both opening and closing command states, then failure source specification accuracy is improved, but system complexity increases
Solution Approach 1:
The system performs preliminary diagnosis actions by commanding cutoff valves to specific states (opening or closing) before actual failure occurs. By pre-establishing known good states and comparing them with actual operational states, the system can identify failures more accurately without adding complex diagnostic hardware, as the valve commands themselves serve as the diagnostic mechanism.
Solution Approach 2:
The diagnosis system dynamically adapts its complexity based on operational needs. Rather than maintaining a constantly complex diagnostic structure, the system activates specific diagnosis modes (opening command state or closing command state) as needed, simplifying the overall system while maintaining high failure source identification accuracy when diagnostics are required.
Data Source
AI summary
An operation quantity detector detects an operation quantity. Hydraulic passage systems provide connection between hydraulic chambers of a tandem type master cylinder and wheel cylinders. A hydraulic pressure source in the hydraulic passages can pressurize the hydraulic passages based on the operation quantity. Cutoff valves each is installed in each of the hydraulic passages, between the master cylinder and the hydraulic pressure source. The hydraulic pressure detectors detect hydraulic pressures of the hydraulic passages. In the opening command state, a first mutual diagnosis based on the hydraulic pressures and the operation quantity and a second mutual diagnosis based on the hydraulic pressures are performed. In the closing command state, the first and second mutual diagnoses are performed. A failure is detected in the cutoff valves and the hydraulic pressure detecting units based on results of the first and second mutual diagnoses in the opening closing command states.