초록 ▼

A Low Pressure Warning Device, System and Method is disclosed. The disclosed system is compact, and low cost but has an extremely long term service life. Further disclosed is sensing means that actively monitors the pressure conditions of a pneumatic chamber without drawing electrical power. The dis

A Low Pressure Warning Device, System and Method is disclosed. The disclosed system is compact, and low cost but has an extremely long term service life. Further disclosed is sensing means that actively monitors the pressure conditions of a pneumatic chamber without drawing electrical power. The disclosed preferred sensing means will further detects various conditions, including activation-, normal- and low-pressure conditions. Also disclosed is a device that is installable within the pneumatic tire of a vehicle such that it is theft- and tamper-resistant. The disclosed device is resistant to truck tire operating temperatures and is further provided with a protective casing to prevent damage or contamination of the system components. Still further disclosed are a transmitter and receiver that are configured to transmit and receive encoded signals to permit great flexibility in vehicle monitoring combinations, while also providing the localization of the pneumatic chamber experiencing a low pressure condition. The disclosed transmitter provides alarm signal transmissions that are pulsed to shorten transmission duration and consequently reduce transmitter power consumption as well as improve receiver reliability. Also disclosed is a transmitter-sensor that includes battery prolonging means to retard passivation layer buildup within the battery.

대표청구항 ▼

[ What is claimed is:] [1.] A device for sensing a condition of a pneumatic chamber, comprising:a base;sensing means, associated with said base, for monitoring the chamber condition and detecting a normal condition an abnormal condition, and an inactive condition;alarm circuit means, associated with

[ What is claimed is:] [1.] A device for sensing a condition of a pneumatic chamber, comprising:a base;sensing means, associated with said base, for monitoring the chamber condition and detecting a normal condition an abnormal condition, and an inactive condition;alarm circuit means, associated with said base, for generating signals indicative of the chamber condition, including:switching means operatively connected to said alarm circuit means and responsive to said sensing means for de-energizing said alarm circuit means when said sensing means detects a normal condition and energizing said alarm circuit means when said sensing means detects an abnormal condition; andpower supply means operatively connected to power said switching means and said alarm circuit means, said operative connection of said power supply means being disconnectable when said inactive condition is detected.