Steering Device Abnormality Diagnosis via Test Drive Signals
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Solution Overview
Problem
Conventional steering devices lack an effective initial abnormality diagnosis mode that can detect operation abnormalities of the electric motor and mechanism components of the turning actuator, which can lead to decreased operation reliability.
Innovation Solution
A power steering device with a controller that outputs both drive and test drive command signals to the turning actuator, allowing for the diagnosis of abnormal states by monitoring the actuator's operation signals, thereby enabling the detection of abnormalities in the electric motor and mechanism components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional initial abnormality diagnosis mode is used (only judging controller abnormalities in static state), then the diagnosis process is simple, but it cannot detect operation abnormalities of electric motor and mechanism components
Solution Approach 1:
The system performs preliminary abnormality diagnosis by outputting test drive command signals before normal operation begins. The abnormality diagnosis section evaluates the turning actuator's response to these test signals to detect potential failures in the electric motor and mechanism components before they affect actual steering operations.
Solution Approach 2:
The system establishes a feedback loop where the turning actuator operation signal is fed back to the abnormality diagnosis section. This feedback mechanism allows continuous monitoring and comparison of actual actuator performance against expected responses to test drive command signals, enabling detection of abnormalities in the electric motor and mechanical components.
2Reliability
If test drive command signal is outputted to turn steered wheels during abnormality diagnosis, then operation abnormalities can be detected, but it may cause unintended vehicle movement
Solution Approach 1:
The system segments the steering system into controllable components, allowing the turning actuator to be tested independently through test drive command signals. This segmentation enables isolated diagnosis of the electric motor and mechanism components without requiring full vehicle operation, thereby detecting abnormalities while preventing unintended vehicle movement.
Solution Approach 2:
The turning actuator serves as an intermediary element between the controller and the steered wheels during abnormality diagnosis. By directing test drive command signals through the turning actuator and monitoring its operation signals, the system can evaluate the health of the electric motor and mechanism components while the steered wheels remain in a controlled, non-hazardous state.
Data Source
AI summary
A steering device includes: a turning actuator drive command signal output section to output the turning actuator drive command signal, a turning actuator drive command signal including a drive command signal, and a test drive command signal, the drive command signal being outputted to the turning actuator when the vehicle is in a first state, the test drive command signal being outputted to the turning actuator when the vehicle is in a second state, the turning actuator operation signal input section to receive a signal relating to the operation of the turning actuator, and the abnormality diagnosis section to judge whether or not the steering device is in an abnormal state, based on the signal relating to the operation of the turning actuator with respect to the test drive command signal.