| US 7,363,804 B2 | ||
| Method for detecting malfunction of a cooling system based on detected coolant temperature | ||
| Keiji Wakahara, Kariya (Japan); and Akira Ichikawa, Chiryu (Japan) | ||
| Assigned to Denso Corporation, (Japan) | ||
| Filed on Oct. 17, 2006, as Appl. No. 11/581,362. | ||
| Application 11/581362 is a division of application No. 10/986228, filed on Nov. 12, 2004, granted, now 7,137,295. | ||
| Application 10/986228 is a division of application No. 10/790779, filed on Mar. 03, 2004, granted, now 6,957,570. | ||
| Application 10/790779 is a division of application No. 10/359266, filed on Feb. 06, 2003, granted, now 6,725,710. | ||
| Application 10/359266 is a division of application No. 10/100039, filed on Mar. 19, 2002, granted, now 6,679,110. | ||
| Application 10/100039 is a division of application No. 09/693904, filed on Oct. 23, 2000, granted, now 6,386,022. | ||
| Application 09/693904 is a division of application No. 08/988907, filed on Dec. 11, 1997, granted, now 6,279,390. | ||
| Claims priority of application No. 8-336579 (JP), filed on Dec. 17, 1996; application No. 8-344749 (JP), filed on Dec. 25, 1996; and application No. 9-283208 (JP), filed on Oct. 16, 1997. | ||
| Prior Publication US 2007/0033998 A1, Feb. 15, 2007 | ||
| Int. Cl. G01M 15/00 (2006.01) | ||
| U.S. Cl. 73—118.1 | 6 Claims |
| 1. A method for detecting a malfunction of a cooling system of an internal combustion engine, comprising:
detecting a coolant temperature on a side of the engine; and
determining, when a parameter related to an intake air amount reaches a predetermined value, a malfunction of a cooling system
based on the detected coolant temperature,
wherein the malfunction determination uses the coolant temperature detected at an engine start time.
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