DEVICE FOR DETECTING CONCENTRATION AND REMAINING AMOUNT OF LIQUID REDUCER

Title:

DEVICE FOR DETECTING CONCENTRATION AND REMAINING AMOUNT OF LIQUID REDUCER

Document Type and Number:

WIPO Patent Application WO/2005/042936

Kind Code:

A1

Abstract:

A sensor for outputting signals relating to the concentration and remaining amount of liquid reducer according to the heat conduction characteristic between spaced tow points is installed in a storage tank where the liquid reducer is stored. A controller incorporating a computer judges that the vehicle state of a vehicle becomes stable when the stop time during which the vehicle continuously stop reaches a predetermined time. Further if the vehicle state is stable, the controller calculates the concentration of the liquid reducer from the signals from the sensor in response to a measurement trigger outputted every predetermined time after the engine is started, and estimates the remaining amount of liquid reduce from the signals from the sensor irrespective of the vehicle state. Therefore, the concentration of the liquid reducer is calculated only when no convection occurs in the storage tank and consequently the accuracies of detection of the concentration and remaining amount of liquid reducer can be both ensured.

Inventors:

NISHINA MITSUHIRO (JP)
KURITA HIROYUKI (JP)
KATOU TOSHIKAZU (JP)

Application Number:

PCT/JP2004/012939

Publication Date:

May 12, 2005

Filing Date:

September 06, 2004

Export Citation:

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Assignee:

NISSAN DIESEL MOTOR CO (JP)
NISHINA MITSUHIRO (JP)
KURITA HIROYUKI (JP)
KATOU TOSHIKAZU (JP)

International Classes:

F01N3/20; F01N3/08; (IPC1-7): F01N3/08

Domestic Patent References:

WO2002027280A2	2002-04-04
WO2002057603A1	2002-07-25

Foreign References:

JP2002370016A	2002-12-24
JP2002527660A	2002-08-27
JP2002513109A	2002-05-08
JP2002508466A	2002-03-19
JP2001020724A	2001-01-23
JP2000027267A	2000-01-25

Other References: