Shifter Abnormality Diagnosis Using Select Lever Position
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Solution Overview
Problem
Existing shifter abnormality diagnosis systems may erroneously determine switch abnormalities due to temporary unstable operation immediately after the ignition switch is turned on, leading to incorrect assessments.
Innovation Solution
A shifter abnormality diagnosis device and method that prohibits abnormality diagnosis of the second switch if the select lever is not in a forward range, using a first switch to determine the select lever's position and preventing diagnosis during unstable operation periods, thereby avoiding erroneous determinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If abnormality diagnosis of the second switch is performed immediately after ignition switch is turned on, then early detection of switch abnormalities is achieved, but erroneous determination occurs due to unstable operation
Solution Approach 1:
The system performs preliminary checks by detecting the select lever position via the first switch before proceeding to diagnose the second switch. This preliminary action ensures that diagnosis only occurs when the system is in a stable state (select lever in forward range), preventing erroneous determination during unstable operation immediately after ignition is turned on.
2Reliability
If abnormality diagnosis is performed continuously, then comprehensive monitoring is achieved, but false abnormality detection occurs during temporary unstable states
Solution Approach 1:
The system dynamically adjusts the timing and conditions for abnormality diagnosis based on the operational state detected by the first switch. The diagnosis of the second switch is enabled only when the select lever is detected in a forward range, making the monitoring process adaptive to system stability rather than continuous and rigid.
3Adaptability or versatility
If the second switch is diagnosed in all operating conditions, then complete coverage of diagnostic scenarios is achieved, but resource waste occurs on unnecessary diagnoses
Solution Approach 1:
The system applies different diagnostic strategies to different operational conditions. The first switch diagnosis is performed continuously across all conditions, while the second switch diagnosis is selectively applied only when the select lever is in a forward range. This localized approach optimizes resource allocation by focusing detailed diagnosis only where necessary.
Data Source
AI summary
A shifter abnormality diagnosis device for a shifter used in an automatic transmission having a manual mode, the shifter including a first switch for outputting a signal corresponding to the position of a select lever and a second switch for outputting a signal corresponding to the position of the select lever if the select lever is located in at least one of an upshift range or a downshift range, wherein the abnormality diagnosis device is configured to perform an abnormality diagnosis of the second switch on the basis of an output signal of the second switch and prohibit the abnormality diagnosis of the second switch if it is determined that the select lever is not located in any one of forward ranges including the upshift range and the downshift range on the basis of an output signal of the first switch.