Connecting circuit for connecting a lambda probe to a control ap

Details Connecting circuit for connecting a lambda probe to a control ap Connecting circuit for connecting a lambda probe to a control ap

1992-04-24

1994-03-29

Strecker, Gerard R.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of ground fault indication

324522, 340649, 123694, 60274, G01R 3102, F01N 300, F02M 700

Patent

active

052988651

ABSTRACT:
The invention is directed to a connecting circuit for a potential-free lambda probe having a ground line and a signal line and having an offset voltage source which is connected to the ground line. This offset voltage source raises the potential of the ground line to a pregiven value relative to ground. A ground short is directly detectable in the connecting circuit of the invention in that the potential measured at the signal line drops below the offset voltage. In this way, it is no longer required as in conventional circuits to check for a ground short by enriching the mixture of an engine and to monitor the exhaust gas with the lambda probe.

REFERENCES:
patent: 4526147 (1985-07-01), Gnob
patent: 4622809 (1986-11-01), Abthoff et al.
patent: 4951632 (1990-08-01), Yakuwa et al.
patent: 5091698 (1992-02-01), Grabs

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