Method and arrangement for determining the sensitivity of a hydr

Details Method and arrangement for determining the sensitivity of a hydr Method and arrangement for determining the sensitivity of a hydr

1997-07-31

1999-03-02

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

73 106, 73 2331, 123703, G01N 700, G01N 2716

Patent

active

058757686

ABSTRACT:
The invention is directed to a method of determining the sensitivity of a hydrocarbon sensor for an internal combustion engine generating exhaust gas during the operation thereof. The hydrocarbon sensor includes a probe electrode subjected to the exhaust gas and a heater device for heating the probe electrode whereby a voltage (U) is generated in the sensor and is present at the probe electrode with the voltage (U) being a criterion for the concentration of hydrocarbon molecules in the exhaust gas. The voltage (U) present on the probe electrode is short circuited for a short time and the voltage (U) is measured as a function of time to obtain a voltage curve. A conclusion is then drawn as to the sensitivity of the hydrocarbon sensor from the voltage curve. The invention is also directed to an arrangement for carrying out the invention.

REFERENCES:
patent: 4314475 (1982-02-01), Karpov et al.
patent: 4742808 (1988-05-01), Blumel et al.
patent: 4789939 (1988-12-01), Hamburg

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