Circuit for determining the internal resistance of a linear...

Details Circuit for determining the internal resistance of a linear... Circuit for determining the internal resistance of a linear...

2005-03-15

2005-03-15

Deb, Anjan K. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S713000, C324S076130

Reexamination Certificate

active

06867605

ABSTRACT:
A device for measuring the probe impedance of a linear lambda probe of an internal combustion engine which is caused by an AC current measurement signal which is fed into the lambda probe, comprises a voltage amplifier for amplifying an AC voltage which drops across the probe impedance, and a rectifier for rectifying the amplified AC voltage, wherein the rectifier is a synchronous demodulator, by which in each case the upper and lower amplitude of the AC voltage signal is sampled with its frequency, filtered and stored, and by which the difference of the stored signals is amplified with a gain factor and made available as output signal at its output for controlling the temperature of the lambda probe.

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