Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – In vehicle wiring
Patent
1990-06-07
1992-12-15
Harvey, Jack B.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
In vehicle wiring
324511, 36442404, G01R 3100
Patent
active
051720620
ABSTRACT:
An apparatus and method for testing electrical loads such as appliances connected with a DC source in a motor vehicle. The loads receive their signals causing them to operate from an electronic control unit. The latter is connected with a diagnostic computer in a manner so as to comply with the industrial standard DIN/ISO 9141. The diagnostic program is stored in the computer, for instance on a diskette. During a test, a precision resistor or shunt is connected in the current path between the DC source and the load. When the load to be tested has been turned on by the diagnostic computer the precision resistor leads to produces a voltage drop dependent on the current flow in the load. Such voltage drop is measured and compared in the diagnostic computer with a rated value specific for the load. If there is a difference the size of the difference provides information indicating the nature of the fault or malfunction of the load.
REFERENCES:
patent: 4207611 (1980-06-01), Gordon
patent: 4363105 (1982-12-01), Plessmeir
patent: 4752959 (1988-06-01), Matsumoto
patent: 4757463 (1988-07-01), Balloy
patent: 4796206 (1989-01-01), Boscove et al.
patent: 4853850 (1989-08-01), Krass, Jr. et al.
patent: 4901025 (1990-02-01), Hirano et al.
Harvey Jack B.
MAN Nutzfahrzeuge A.G.
Regan Maura K.
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