Diagnosing speed sensor defect of an automotive vehicle electron

Boots – shoes – and leggings

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123179A, 123198D, 340 62, 36443110, G08B 2100, G08B 2900, G06F 1132

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045649162

ABSTRACT:
In a diagnosis apparatus for an electronic control system adapted to vehicles and including a speed sensor for producing speed pulses responsive to the actual vehicle speed, a switch produces a diagnosis signal when actuated upon request for self-diagnosis in operation of the control system. A computer is responsive to the diagnosis signal to discriminate change of the level of each speed pulse during movement of the vehicle and to produce a first signal in dependence upon discrimination of change of the level of each speed pulse and a second signal in dependence upon discrimination of unchangeable state of the level of each speed pulse, and an indicator indicates an error in operation of the speed sensor in response to the second signal and normal operation of the speed sensor in response to the first signal.

REFERENCES:
patent: 4192279 (1980-03-01), Maisch et al.
patent: 4233599 (1980-11-01), Brearley
patent: 4246493 (1981-01-01), Beeghly
patent: 4402286 (1983-09-01), Pagel et al.
patent: 4414937 (1983-11-01), Ueda et al.
Bowler: Throttle Body Fuel Injection-An Integrated Engine Control System, Society of Automotive Engineers, Paper #800164, pp. 1, 2 of interest.

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