Resources Contact Us Home
Catalyst deterioration-determining device for an internal combustion engine

Image Number 4 for United States Patent #5448886.

A catalyst deterioration-determining device for an internal combustion engine having first and second exhaust sensors positioned in an exhaust path of the internal combustion engine upstream downstream, respectively, of a catalyzer located in the exhaust path. The internal combustion engine further including a control station for effecting feedback control to match an air-fuel ratio with a desired value in accordance with first and second detection signals from the first and second exhaust sensors, respectively. The catalyst deterioration-determining device including a determining section provided in the control station which obtains a deterioration-determined value from calculations based on a rich determination delay time, a lean determination delay time, a lean response delay time and a rich response delay time when a deteriorated state of the catalyzer is determined. The lean response delay time and the rich response delay time extend from the beginning of a decrease and an increase in the first feedback control-corrected quantity to a lean inversion time and a rich inversion time of the second detection signal in response to rich and lean inversions of the first detection signal. The rich determination delay time and the lean determination delay time extend from a rich inversion time and a lean inversion time of the first detection signal to the beginning of the decrease and increase in the feedback control-corrected quantity. The determining section performs calculations in accordance with the deterioration-determined value to determine the deteriorated state of the catalyzer.

  Recently Added Patents
Image processing apparatus, image processing method, and program
Semiconductor device and method for manufacturing the same
Method of making a CIG target by cold spraying
Antimicrobial flush solutions
Geographically self-labeling access points
Method for preparing a .beta.-SiAlON phosphor
Method for cutting C--Mn steel with a fiber laser
  Randomly Featured Patents
Gelled system and method for detecting microorganisms by separation and culture on gelled system
Vibrator assembly
Video game machine
Method of and device for compensating variations of branch currents in electroplating baths
Array substrate for in-plane switching mode liquid crystal display device and method of manufacturing the same
Opto-electrical devices and methods of making the same
Search engine graphical interface using maps of search terms and images
Ultrasonic therapeutical apparatus
Paint supply system
Cleaning agent for optical surfaces