Method and apparatus for securing car against theft via wireless sensor

• US 20070109108A1
• Filed: 11/13/2006
• Published: 05/17/2007
• Est. Priority Date: 11/15/2005
• Status: Active Grant

• Current Assignee: Tse Chen
• Original Assignee: Tse Chen
• Inventors: Chen, Tse
• Granted Patent: US 7,595,719 B2
• Time in Patent Office: Days
• US Class Current: 340/426.240
• CPC Class Codes: B60R 25/1004 Alarm systems characterised by the type of sensor, e.g. current sensing means using door lock sensors B60R25/1001
• CPC Class Codes: B60R 25/1018 Alarm systems characterised by features related to the general power supply
• CPC Class Codes: B60R 25/104 characterised by the type of theft warning signal, e.g. visual or audible signals with special characteristics
• CPC Class Codes: G08B 13/1654 using passive vibration detection systems
• CPC Class Codes: G08B 13/19 using infrared-radiation detection systems G08B13/194 takes precedence

Abstract

In a method and apparatus for securing car against theft via wireless sensor, a charging circuit and chargeable battery, a CPU circuit connected to a transmission circuit, and an air pressure sensor or an infrared sensor are provided in a cigarette-lighter plug, so that the sensor detects any change of air pressure or any change of temperature in a car due to any invader, and sends a trigger signal to the CPU circuit. The signal is encoded at the CPU circuit and then transmitted via the transmission circuit to a wireless antitheft main unit mounted in the car to trigger a siren as a warning if main unit is set to active stale by external remote control transmitter. Since no wire is needed between the sensor and the main unit, a thief is prevented from locating the main unit by tracing any wire extended thereto.

Claims

1. A method for securing car against theft via wireless sensor, comprising the steps of providing a charging circuit and a chargeable battery, a CPU circuit, a transmission circuit, and an air pressure sensor in a cigarette-lighter plug;

mounting and connecting an antitheft main unit to a power source in a car;

setting said main unit to an active state;

plugging said cigarette-lighter plug in a cigarette-lighter socket on the car, so that said air pressure sensor built in said cigarette-lighter plug detects any change of air pressure in the car due to door open, trunk open, glass broken, big shock and sends out a signal to said CPU circuit;

encoding said trigger signal sent by said air pressure sensor at said CPU circuit; and

transmitting said encoded trigger signal via said transmission circuit to said antitheft main unit to trigger a siren.

2. A method for securing car against theft via wireless sensor, comprising the steps of providing a charging circuit and a chargeable battery, a CPU circuit, a transmission circuit, and an infrared sensor in a cigarette-lighter plug;

mounting and connecting an antitheft main unit to a power source in a car;

setting said main unit to an active state;

plugging said cigarette-lighter plug in a cigarette-lighter socket on the car, so that said infrared sensor built in said cigarette-lighter plug detects any change of temperature in the car due to any invader, and sends out a trigger signal to said CPU circuit;

encoding said trigger signal sent by said infrared sensor at said CPU circuit; and

transmitting said encoded trigger signal via said transmission circuit to said antitheft main unit to trigger a siren.

3. An apparatus for securing car against theft via wireless sensor, comprising a cigarette-lighter plug and an antitheft main unit;

said cigarette-lighter plug being plugged in a cigarette-lighter socket on a car, and internally provided with a charging circuit and chargeable battery, a CPU circuit, a transmission circuit connected to said CPU circuit, and a wireless air pressure sensor;

said charging circuit and said chargeable battery being charged when the car engine is running or ignition key is on, and adapted to supply power to said cigarette-lighter plug when the car engine is off or ignition key is off;

said wireless air pressure sensor being adapted to detect any change of air pressure in the car and send out a trigger signal to said CPU circuit;

said CPU circuit being adapted to encode said trigger signal sent by said wireless air pressure sensor; and

said transmission circuit being adapted to transmit the trigger signal coded by said CPU circuit to said antitheft main unit; and

said antitheft main unit being mounted on and connected to a power source of the car, and adapted to receive said coded trigger signal from said transmission circuit in said cigarette-lighter plug to trigger a siren electrically connected to said main unit.

4. An apparatus for securing car against theft via wireless sensor, comprising a cigarette-lighter plug and an antitheft main unit;

said cigarette-lighter plug being plugged in a cigarette-lighter socket on a car, and internally provided with a charging circuit and chargeable battery, a CPU circuit, a transmission circuit connected to said CPU circuit, and a wireless infrared sensor;

said chargeable circuit and said charging battery being charged when the car engine is running or ignition key is on, and adapted to supply power to said cigarette-lighter plug when the car engine is off or ignition key is off;

said wireless infrared sensor being adapted to detect any change of temperature in the car due to an invader and send out a trigger signal to said CPU circuit;

said CPU circuit being adapted to encode said trigger signal sent by said wireless infrared sensor; and

said transmission circuit being adapted to transmit the trigger signal coded by said CPU circuit to said antitheft main unit; and

said antitheft main unit being mounted on and connected to a power source of the car, and adapted to receive said coded trigger signal from said transmission circuit in said cigarette-lighter plug to trigger a siren electrically connected to said main unit.