Vehicle Tire Warning System
First Claim
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1. An air pressure sensor for a vehicle tire warning system, comprising:
- a tubular housing having a chamber defined therein, the chamber being communicated to the atmosphere via a connecting pipe;
an air pressure actuating device suitably seated in the chamber and being moveable back and forth in the chamber in response to air pressure change in the vehicle tire; and
a switch device adapted to electrically connect a high air pressure warning circuit or a low air pressure warning circuit under the drive of the air pressure actuating device.
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Abstract
An air pressure sensor (2) for a vehicle tire warning system includes a tubular housing (21) defining a chamber (218), an air pressure actuating device seated in the chamber and being moveable back and forth in the chamber in response to air pressure change in the vehicle tire, and a switch device to electrically connect a high air pressure warning circuit or a low air pressure warning circuit under the drive of the air pressure actuating device. The chamber of the tubular housing is communicated to the atmosphere via a connecting pipe (29).
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Citations
18 Claims
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1. An air pressure sensor for a vehicle tire warning system, comprising:
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a tubular housing having a chamber defined therein, the chamber being communicated to the atmosphere via a connecting pipe; an air pressure actuating device suitably seated in the chamber and being moveable back and forth in the chamber in response to air pressure change in the vehicle tire; and a switch device adapted to electrically connect a high air pressure warning circuit or a low air pressure warning circuit under the drive of the air pressure actuating device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A transmitting circuit for a vehicle tire warning system to transmit wireless signals via trigger and connection of an air pressure sensor, the transmitting circuit is controlled via an eight bit single chip PIC12C508A, VDD end of the single chip is connected to D_IN output ports of the air pressure sensor via three diodes to form a signal switching circuit;
- on detecting danger signals, the air pressure sensor outputs a high voltage to conduct the diodes and provides the VDD end with a threshold voltage to activate the PIC12C508A to work, D_IN ports each provides GP0/GP1/GP3 with marking signal via 1K resistances to respectively indicate temperature warning, high air pressure warning and low air pressure warning, the single chip PIC12C508A processes the marking signals and outputs warning signals via a GP4 port, a coding chip PT2240B codes the warning signal impulses and transmits the coded signals via an antenna.
Specification