Anti-theft system for immobilizing a vehicle
US5570756A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1995 |
| Grant date | Nov 5, 1996 |
| Priority date | — |
| Expiry date | Jun 22, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R25/08
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A vehicle security system for immobilizing a vehicle to prevent theft and other unauthorized movement of the vehicle. The system includes a brake blocking valve for selectively preventing fluid communication between the vehicle wheel brake cylinders and the vehicle brake master cylinder. The brake blocking valve is activated after the vehicle is brought to a stop, the service brakes are applied, and either an activation pushbutton is pressed to engage the system while the engine is running, or, alternatively, the system is automatically activated by turning off the ignition switch while foot pressure is maintained on the service brake. In addition to blocking vehicle movement by locking the service brakes in the brake engaged condition, the system also disables the starter by opening the starter circuit, and it disables the ignition coil by opening the ignition circuit, thereby further deterring and preventing unintended vehicle movement. Deactivation of the system is effected by entering a deactivation code into a numerical keypad mounted on the vehicle dashboard. The deactivation code is known only to an authorized user of the vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.