Vehicle Shift Control Abnormality Detection
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Solution Overview
Problem
Momentary-type shift operation devices in vehicles can lead to erroneous abnormality determinations when the shift position is changed back to the initial position, as the required position may not coincide with the actual shift position of the automatic transmission, causing concerns about normal or abnormal system states.
Innovation Solution
A vehicle system with an electronic control unit that sets a first required position based on the initial and operation positions, holds this position as a second required position until a new position is set, and compares it with the actual shift position to determine if the system is abnormal, preventing erroneous determinations by considering the shift operation device's momentary nature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a momentary-type shift operation device is used, then the operator returns to initial position automatically, but erroneous abnormality determination occurs when comparing required position with shift position
Solution Approach 1:
The electronic control unit stores the operation position just before the operator returns to initial position as a second required position in advance. This preliminary storage ensures that when abnormality determination is performed after the operator returns to initial position, the comparison is made against the correct previous operation position rather than the current initial position, preventing erroneous abnormality determination.
2Loss of information
If the required position is updated immediately when operator returns to initial position, then the required position reflects current operator position, but it no longer matches the actual shift position of automatic transmission
Solution Approach 1:
The electronic control unit performs a preliminary update of the second required position to store the operation position before the operator returns to initial position. This ensures that the required position information is preserved and maintained for accurate comparison with the actual shift position, preventing the loss of meaningful position information that would occur if the required position were immediately updated to reflect the initial position.
Data Source
AI summary
A vehicle system includes: a shift operation device including an operator, the operator being configured to be returned to an initial position when not operated by a driver, the operator being configured to be operated by the driver to an operation position corresponding to a shift position of an automatic transmission; a change mechanism configured to change the shift position by activating an actuator; and an electronic control unit configured to set a first required position on the basis of the initial position and the operation position, electrically change the shift position on the basis of the required position, hold the required position as a second required position until a new required position is set on the basis of the operation position, and, by comparing the second required position with the shift position, determine whether the vehicle system is abnormal.