Electric Brake Device Abnormality Detection During Travel
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Solution Overview
Problem
Existing electric brake devices in vehicles fail to detect abnormalities, such as partial disconnection of harnesses or sensor malfunctions, during non-operation periods, leading to potential increased braking distances and safety risks when the brake is eventually applied.
Innovation Solution
An electric brake device with a control module that activates the electric actuator to detect abnormalities by comparing actual and estimated pressing forces, even when the brake is not in use, using a predetermined condition to generate a deceleration ratio, and includes a timer for automatic detection and notification systems to alert the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric brake device is not operated during vehicle travel, then energy consumption is reduced and normal braking performance is maintained, but abnormalities such as partial disconnection of harnesses or sensor malfunctions cannot be detected
Solution Approach 1:
The control device performs abnormality detection by operating the electric brake before actual braking is needed. The abnormality detecting operation control module activates the electric actuator to press the pressing member against the brake rotor, comparing measured pressing force with estimated pressing force to detect abnormalities in advance during vehicle travel, even without driver brake input.
Solution Approach 2:
The electric brake device performs self-diagnosis by automatically operating itself to detect abnormalities. The control device uses the electric actuator to generate pressing force and compares measured values with estimated values, enabling the system to self-monitor its own health status without external intervention or driver action.
2Reliability
If the electric actuator is activated frequently for abnormality detection, then abnormality detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The abnormality detecting operation is performed periodically during vehicle travel rather than continuously. The control device activates the electric actuator at intervals to compare measured pressing force with estimated pressing force, achieving adequate detection accuracy while minimizing energy consumption by avoiding constant operation.
3Reliability
If abnormality detection is performed only when the brake is applied by the driver, then the detection system remains simple, but abnormalities cannot be detected during extended periods without braking
Solution Approach 1:
The control device integrates abnormality detection functionality into the existing brake control system. The same electric actuator and pressing mechanism used for normal braking are also utilized for abnormality detection, allowing the system to perform multiple functions without adding separate dedicated detection hardware.
Data Source
AI summary
An electric brake device is provided which is capable of early detecting presence/absence of abnormality in the brake device during the traveling of a vehicle in the absence of the operation of a brake application device. A controller includes an abnormality detecting operation controller which operates the electric motor according to a predetermined condition during the traveling of the vehicle in the absence of the operation of the brake application device. The device further includes an abnormality detector which obtains a measured value of a predetermined item related to the vehicle when the electric motor is operated by the abnormality detecting operation controller, and compares the measured value with an estimated value or a set value to detect presence/absence of abnormality in the brake device.