US 5,315,286 A · Vehicle security system

Abstract

A vehicle security system including a key switch, a first relay, a second relay, a first timer, a second timer, a warning device, and a push-button switch. The key switch activates and deactivates the system. Once the key switch is in an operative position and the system is activated, the vehicle's ignition switch in an operative position activates the second relay. Operation of the second relay, or of a vehicle door switch, activates the first relay which starts the first and second timers. The first timer initiates a first timing delay and, at the end of this timing delay, activates the warning device. The warning device warns the driver that the alarm sequence has been initiated. The push-button switch initiates an engine standby mode. The second timer initiates a second timing delay and cuts off the engine unless a standby mode is initiated before the end of the second timing delay.

A vehicle security system for a vehicle, said vehicle having an engine, a plurality of doors, a set of interior lights, a starter, a coil, a starter solenoid coupled to the starter, and a battery having a positive terminal and a negative terminal, with the negative terminal coupled to a ground, a resistor, an ignition switch coupled to the starter solenoid and coupled to the positive terminal of the battery, and a horn having a first terminal coupled to the ground, the vehicle security system comprising:

a first diode having a first terminal coupled to a second terminal of the horn;
a second diode having a first terminal coupled to a second terminal of said first diode;
a third diode having a first terminal coupled to the set of interior lights;
a key switch having a first terminal coupled to a second terminal of said second diode;
a push-button switch having a first terminal coupled to the first terminal of said key switch and a second terminal coupled to a first terminal of said resistor, said push-button switch having two contacts in a normally closed position, said push-button switch, responsive to being pushed, for initiating an engine standby mode by momentarily opening and returning to the closed position;
a plurality of door switches, each of said plurality of door switches having a first terminal coupled to the ground, and each of said plurality of door switches having a second terminal coupled to the first terminal of said third diode;
a buzzer having a first terminal coupled to the ground;
a fuse having a first terminal coupled to the positive terminal of the battery;
a fourth diode having a first terminal coupled to a primary terminal of the ignition switch;
a first relay having a first terminal of a first set of contacts, said first set of contacts in a normally open position, and a first terminal of a second set of contacts, said second set of contacts in a normally open position, connected to the ground, the first set of contacts closing and the second set of contacts closing when activating said first relay;
a second relay having a first terminal of a set of contacts, said set of contacts in a normally open position, connected to the ground and having a second terminal of the set of contacts connected to a second terminal of the first set of contacts of said first relay, the set of contacts of the second relay closing when activating said second relay;
a first timer having a first terminal of a first set of contacts, said first set of contacts in a normally open position, and a first terminal of a second set of contacts, said second set of contacts in a normally open position, coupled to a second terminal of said fuse, having a second terminal of the first set of contacts coupled to a second terminal of said fourth diode, and having a second terminal of the second set of contacts coupled to a second terminal of said buzzer, with said first set of contacts closing and said set of contacts closing after a first predetermined-time delay after activating said first timer;
a second timer having a first terminal of a first set of contacts, said first set of contacts in a normally opened position, coupled to the second terminal of said fuse, having a second terminal of the first set of contacts coupled to the second terminal of said first diode, having a first terminal of a second set of contacts, said second set of contacts in a normally closed position, coupled to a positive terminal of the coil, having a second terminal of the second set of contacts coupled to a second terminal of said resistor, said second timer having the first set of contacts closing and the second set of contacts opening after a second predetermined-time delay after activating said second timer;
wherein the second predetermined-time delay of said second timer is greater than the first predetermined-time delay of said first timer;
and
with said starter activating said second relay, at least one of said second relay or said plurality of door switches activating said first relay, said first relay activating said first timer and said second timer, said first timer initiating said buzzer, said push-button switch initiating the engine standby mode, and said second timer, responsive to an absence of the activation of said push-button switch, activating the horn and initiating engine cutoff.

13 more elements

Vehicle security system

Life of this patent

Vehicle security system

Life of this patent

Abstract

Claims14