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:
Dec. 30, 1997
Filed:
Apr. 22, 1996
Nippondenso Co., Ltd., Kariya, JP;
Abstract
Voltage of a terminal at a high impedance is set to a fixed voltage (2.5 V) by a constant current source and a resistor, and whether the voltage of the terminal is a fixed voltage which is between 3.5 V and 5.5 V or not is detected by comparators and a NOR circuit. A control signal is sent from an ECU to the terminal to turn on a switching transistor to lower a divided voltage so that the alternator generates a high voltage only when the voltage of the terminal is the special voltage, and generates normal voltage otherwise. In case of disconnection of the communication line or grounding of the communication line, or when the battery voltage is applied to the communication line, the voltage of the terminal does not become abnormal voltage but become the normal voltage. Thus, abnormal voltage may not applied to the battery.