Self-diagnostic apparatus for vehicle meter
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United States of America Patent
Stats
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Oct 3, 1989
Grant Date -
N/A
app pub date -
Jul 1, 1988
filing date -
Jul 3, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To prevent the driver from being confused by the fact that a pseudo vehicle speed to diagnose a vehicle speed meter is indicated when a vehicle speed sensor is disconnected by an accident during vehicle travelling, a pseudo vehicle speed sensor signal is applied to the vehicle speed meter only when the vehicle speed sensor is disconnected from the vehicle speed meter and the disconnected sensor is reconnected to the meter a predetermined time period after the sensor has been disconnected from the meter. The self-diagnostic apparatus is composed of counters, flip-flops and logical gates, and is reset whenever an ignition switch is turned on.
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