| US 7,513,104 B2 | ||
| Diagnostic apparatus for internal combustion engine | ||
| Rie Takatsuto, Yokohama (Japan); and Hiroshi Katoh, Yokohama (Japan) | ||
| Assigned to Nissan Motor Co., Ltd., Yokohama-shi (Japan) | ||
| Filed on Sep. 22, 2005, as Appl. No. 11/231,936. | ||
| Claims priority of application No. 2004-276634 (JP), filed on Sep. 24, 2004. | ||
| Prior Publication US 2006/0064965 A1, Mar. 30, 2006 | ||
| Int. Cl. F01N 3/00 (2006.01) | ||
| U.S. Cl. 60—277 [60/274; 60/284] | 16 Claims |
| 1. A diagnostic apparatus for an internal combustion engine, comprising:
an exhaust purification section comprising:
an exhaust purifier disposed in an exhaust passage of the internal combustion engine, for purifying an exhaust emission; and
a purifier activation section configured to control engine operating parameters of the internal combustion engine to promote
activation of the exhaust purifier during the internal combustion engine being cold; and
a control unit configured to perform the following:
determining a total exhaust heat quantity as a quantity of heat entering the exhaust purifier during the internal combustion
engine being cold;
determining a state of the exhaust purifier in accordance with the total exhaust heat quantity, wherein the state of the exhaust
purifier includes a purifier residual emission ratio as a proportion of a quantity of the exhaust emission which passes through
the exhaust purifier without being purified;
determining a total purifier out emission quantity as a quantity of the exhaust emission exiting the exhaust purifier during
the internal combustion engine being cold, in accordance with the state of the exhaust purifier; and
determining normality of the exhaust purification section in accordance with the total purifier out emission quantity.
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