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:
Nov. 02, 1999
Filed:
Oct. 13, 1997
Richard T Johnson, Hubertus, WI (US);
William J Wruck, Whitefish Bay, WI (US);
Majid Taghikhani, Franklin, WI (US);
Johnson Controls Technology Company, Plymouth, MI (US);
Abstract
A vehicle anti-theft system that disables a vehicle engine upon detection of an unauthorized vehicle start-up, after the engine is running, by disconnecting the vehicle battery and draining the vehicle electrical system voltage to ground through a resistor. When the system is armed, it monitors whether the engine is running and has been recently started by detecting vibrations, fluctuations in the VES voltage, and the actual VES voltage. The system includes an electro-mechanical switch that has a battery internal contact, a vehicle electrical system, the standard battery external terminal, contact and a disconnect contact. When the switch is connected to the battery contact, the vehicle battery is connected in the circuit. When the switch is connected to the vehicle electrical system contact, the system is connected to ground through a resistance and the battery is disconnected from circuit. When the switch is connected to the disconnect contact, the battery is disconnected and the vehicle electrical system is not connected to ground. When the switch is not energized, it is either connected to the battery contact or the disconnect contact. When the switch is energized, the switch will switch to the vehicle electrical system contact, and then when it is deenergized, it will switch to the opposite battery contact or disconnect contact. The system includes logic so that if the engine is running and has been recently started when it is armed, the system will energize the switch to disconnect it from the battery contact and connect it to the vehicle electrical system contact for a predetermined time to drain the electrical system voltage to ground.