KR910014697A - Catalyst Purification Rate Detection Device - Google Patents

Abstract

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Description

Catalyst Purification Rate Detection Device

As this is a public information case, the full text was not included.

1 is a block functional diagram showing a general configuration of a catalyst purification rate detecting apparatus according to one embodiment of the present invention, FIG. 2 is a schematic diagram of an internal combustion engine system to which an embodiment of the present invention is applied, and FIG. 3 is a purification rate of a three-way catalyst. Characteristic graph which shows the relationship between (alpha) and its oxygen storage capacity.

Claims (8)

(1) a catalyst disposed in the exhaust system of the internal combustion engine to purify the exhaust gas, (2) primary and secondary air-fuel ratio sensors disposed respectively above and below the catalyst to detect respective air-fuel ratios, and (3) Response delay time detection means for detecting the response delay time difference of the primary and air-fuel ratio sensors in different operating states of the internal combustion engine, and (4) the difference between the primary and secondary response delay time differences detected in different driving states of the internal combustion engine. And a purification rate detecting device for an internal combustion engine having a purification output detecting means for detecting the purification rate of the catalyst. 2. The catalyst purification rate detection device according to claim 1, wherein the response delay time difference detecting means includes a time difference detecting means for detecting a time difference from the output of the primary air-fuel ratio sensor to the inversion of the output of the secondary air-fuel ratio sensor. The catalyst purification rate detection device according to claim 1, wherein the catalyst purification rate detection means includes a delay time detection means for detecting a delay time of the exhaust gas in accordance with an operating state of the internal combustion engine. According to claim 1, the feedback correction means for changing the feedback correction factor of one element that determines the fuel injection time in accordance with the output value of the primary air-fuel ratio sensor, and the change of the feedback correction coefficient when the purification rate of the catalyst is measured A purification rate detection apparatus for a catalyst provided with a feedback correction coefficient control means for making a period of time longer than a period in normal emission control. The feedback correction means for changing the feedback correction coefficient of one element for determining the fuel injection time according to the output value of the primary air-fuel ratio sensor, and the change of the feedback correction coefficient when measuring the purification rate of the catalyst. A purification rate detection apparatus for a catalyst provided with a feedback correction coefficient control means for making a period longer than a period in normal emission control. 2. The different operating state of the internal combustion engine according to claim 1, wherein the primary purification rate detection condition is that the rotational speed of the internal combustion engine is in a first predetermined range and the load of the internal combustion engine is in a first predetermined range when the internal combustion engine is in a steady state. And a purification rate detection device for a catalyst determined by means for detecting a secondary purification rate detection condition in which the rotational speed of the internal combustion engine is in the second predetermined range and the load of the internal combustion engine is in the second predetermined range. 3. The different operation state of the internal combustion engine according to claim 2, wherein, when the internal combustion engine is in a normal state, the primary purification rate detection is performed in which the rotational speed of the internal combustion engine is in the first predetermined range and the load of the internal combustion engine is in the first predetermined range. A purification rate detection apparatus for a catalyst determined by means of detecting a condition and a secondary purification rate detection condition in which the rotational speed of the internal combustion engine is in the second predetermined range and the load of the internal combustion engine is in the second predetermined range. 5. The different operating state of the internal combustion engine according to claim 4, wherein the primary purification rate detection condition is that the rotational speed of the internal combustion engine is in the first predetermined range and the load of the internal combustion engine is in the first predetermined range when the internal combustion engine is in a steady state. And a purification rate detection device for a catalyst determined by means for detecting a secondary purification rate detection condition in which the rotational speed of the internal combustion engine is in the second predetermined range and the load of the internal combustion engine is in the second predetermined range. ※ Note: The disclosure is based on the initial application.