Self-diagnostic apparatus for vehicle meter

Details Self-diagnostic apparatus for vehicle meter Self-diagnostic apparatus for vehicle meter

1988-07-01

1989-10-03

Crosland, Donnie L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340444, 340461, 340635, 340653, 340688, 340515, 324 74, 73 1R, 73 2, B60Q 100, G01R 1132

Patent

active

048719935

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.

REFERENCES:
patent: 3761812 (1973-09-01), Plake
patent: 4646003 (1987-02-01), Phillips et al.

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