Low tire warning system

An abnormal tire condition sensing apparatus comprising:

• transducer means for detecting an abnormal tire condition and for producing electrical pulses in response to said abnormal tire condition, said transducer adapted for mounting adjacent a vehicle tire;
• counter means for directly counting the number of transducer pulses, said counter means operatively connected with said transducer means, said counter means producing an enable signal upon reaching a predetermined count;
• encoder means for producing an encoded signal;
• transmitter means for transmitting a modulated radio signal, said transmitting means operatively connected with said encoder means to receive the encoded signal for modulating a carrier frequency to produce the modulated radio signal and said encoder means and said transmitter means operatively connected with said counter means to be enabled by the enable signal whereby the enable signal enables the transmission of the modulated radio signal;
• and
• reset means for resetting said counter means, said reset means comprising a reset counter operatively connected with said encoder means for counting the number of encoded signals produced, said reset counter operatively connected with said counter means for resetting said counter means when said reset counter counts a preselected number of encoded signals, whereby the modulated radio signals are transmitted in groups, each group responsive to a predetermined number of detections of the abnormal condition.

An abnormal tire condition sensing apparatus comprising:

• transducer means for detecting an abnormal tire condition and for producing electrical pulses in response to said abnormal tire condition, said transducer adapted for mounting adjacent a vehicle tire;
• counter means for directly counting the number of transducer pulses, said counter means operatively connected with said transducer means, said counter means producing an enable signal upon reaching a predetermined count;
• charge storage means for storing an electric potential, said charge storage means operatively connected with said transducer means for receiving the transducer pulses therefrom whereby transducer pulses increase the electric potential wherein said counter means includes solid state switching means for switching the potential from said charge storage means when said predetermined count is reached to produce said enable signal;
• encoder means for producing an encoded signal;
• and
• transmitter means for transmitting a modulated radio signal, said transmitting means operatively connected with said encoder means to receive the encoded signal for modulating a carrier frequency to produce the modulated radio signal and said encoder means and said transmitter means operatively connected with said counter means to be enabled by the enable signal whereby the enable signal enables the transmission of the modulated radio signal.