Keyless motor vehicle entry and ignition system
US5937065A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1997 |
| Grant date | Aug 10, 1999 |
| Priority date | — |
| Expiry date | Apr 7, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2209/62
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A keyless control system is disclosed which may be employed to gain entry to a motor vehicle and start an engine. When using this system, a user activates a remote control by selecting a function for the motor vehicle to perform. In response, a challenge number is exchanged and used in an encryption algorithm by both the remote control and a control circuit in the motor vehicle to produce independently of each other separate algorithm answers. A first verification indication is produced when the control circuit finds both answers to be the same. The remote control also sends its unique remote control identification and a designation of the selected function to the control circuit. If the received remote control identification matches is on an authorized remote control list stored in the control circuit, a second verification indication is produced. When both the first and second verification indications are produced, the control circuit issues a signal that causes the motor vehicle to perform the selected function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.