Vehicle Control Device Abnormality Judgment for Traveling Signals
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Solution Overview
Problem
Conventional vehicle control devices fail to accurately determine whether a vehicle is traveling or stopped when abnormalities occur in traveling judgment signals, leading to potential engine misoperation and reduced user convenience.
Innovation Solution
A vehicle control device with a push switch and traveling judgment unit that includes an abnormality judgment unit to assess multiple traveling judgment signals, allowing normal operation switching even with signal abnormalities, preventing mistaken engine stoppage during travel and enhancing convenience when stopped.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the vehicle control device determines vehicle state based on single traveling judgment signal, then the control logic is simple, but the reliability of vehicle state determination deteriorates when signal abnormality occurs
Solution Approach 1:
The patent segments the traveling judgment signal evaluation into multiple independent signals (first traveling judgment signal from vehicle velocity sensor, second traveling judgment signal from communication unit) and processes them separately through the abnormality judgment unit and traveling state determination unit, allowing individual signal failure without complete system failure
Solution Approach 2:
The patent changes the evaluation parameter from a single signal value to a comparison between multiple signal values and their abnormality flags. The traveling state determination unit compares the first and second traveling judgment signals and their respective abnormality statuses to determine vehicle state, providing redundancy and improved reliability
2Reliability
If the vehicle control device prohibits normal stop operation when traveling is detected, then mistaken engine stoppage during travel is prevented, but user convenience deteriorates when vehicle is actually stopped but signals indicate traveling
Solution Approach 1:
The patent introduces the abnormality judgment unit as an intermediary between the traveling judgment signals and the traveling state determination unit. This intermediary evaluates the reliability of input signals and provides corrected information to the determination unit, which then makes appropriate control decisions that balance safety and convenience
Solution Approach 2:
The patent implements feedback through the abnormality judgment unit that continuously monitors the validity of traveling judgment signals and provides feedback to the traveling state determination unit. This feedback mechanism allows the system to adapt its behavior based on signal reliability, enabling normal stop operation when signals are abnormal while preventing mistaken stoppage when signals are reliable
3Reliability
If special pressing operation is required for engine stop when traveling, then engine stoppage safety is improved, but operation complexity increases
Solution Approach 1:
The patent makes the stop operation requirements dynamic based on the determined traveling state. When the traveling state determination unit determines the vehicle is traveling based on reliable signals, special pressing operation is required for engine stop. When the vehicle is determined to be stopped even if signals indicate traveling, normal pressing operation suffices. This dynamic adaptation optimizes both safety and convenience
Data Source
AI summary
A vehicle control device equipped with a vehicle state switching control unit for permitting an on/off switching control of an onboard device or a start/stop switching control of a drive source by a normal pressing operation of a start/stop switch SSSW when the vehicle is currently stopped, and for prohibiting a STOP control of the drive source by the normal pressing operation of the start/stop switch SSSW and permitting the STOP control of the drive source by a special pressing operation of the start/stop switch SSSW when the vehicle is currently traveling. A traveling judgment unit judges that the vehicle is currently stopped, if an abnormality has occurred in at least one of a plurality of signals, and all of the signals, which have been judged not to be abnormal, are stop signals.