Method and apparatus for securing car against theft via wireless sensor
First Claim
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 trigger 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.
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Accused Products
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.
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Citations
4 Claims
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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 trigger 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.
- mounting and connecting an antitheft main unit to a power source in a car;
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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.
- mounting and connecting an antitheft main unit to a power source in a car;
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3. An apparatus for securing car against theft via wireless sensor, comprising a cigarette-lighter plug and an antitheft main unit;
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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; andsaid 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.
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4. An apparatus for securing car against theft via wireless sensor, comprising a cigarette-lighter plug and an antitheft main unit;
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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; andsaid 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.
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Specification