The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 2001
Filed:
Oct. 22, 1999
Katsuaki Uchiyama, Kanagawa-ken, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
In a disclosed diagnostic apparatus and a diagnostic method of a coolant temperature sensor, a time point when a predetermined time is elapsed after an engine started or when a predetermined heat amount is generated in the engine after the engine started is set as a measuring timing. A variation amount of output of the coolant temperature sensor from the start of the engine to the measuring timing is calculated, and it is judged that a trouble occurs in the coolant temperature sensor when the variation amount is smaller than a predetermined value. The apparatus and the method are preferably applied to diagnosis of a cooling apparatus comprising a cooling section for carrying off heat of the engine by coolant to cool the engine, a radiator for radiating the heat carried off by the coolant, and a thermostat for controlling a flow rate of the coolant which circulates via the cooling section and the radiator.