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Tire condition monitoring system
| Details |
Inventors: McLaughlin, John T.; Rovan, Joseph W.;
Assignee:
Primary Examiner: Pope; Daryl
Assistant Examiner:
Attorney, Agent or Firm: Kelly Bauersfeld Lowry & Kelley, LLP
A tire condition monitoring system includes a monitoring device securely positioned within a tire and in electronic communication with a receiver and a cab mounted visual display. In one embodiment, the monitoring device includes a battery, an inductive pick-up coil, pressure and/or temperature sensors, a microprocessor, and a data transmitter. Each monitoring device has a unique multi-bit identification code. The monitoring device is shipped in an energy conserving dormant state until activated either by pressurization of the tire or by use of a portable hand-held wand transmitter. The hand-held transmitter assigns the monitoring device a relative tire position. After activation, the monitoring device periodically senses tire condition. This information is stored and compared to preset parameters and the last stored tire condition information. The tire information is periodically sent to the receiver and visually displayed. If the sensed tire condition information deviates from preset parameters, the sensed tire information is immediately telemetered to the receiver and an alarm is activated. During prolonged periods of vehicle and tire inactivity, the monitoring device measures and transmits less frequently to preserve power. The monitoring device automatically reactivates upon vehicle reactivity. In another embodiment, a monitoring device having a mechanical air pressure sensor, a motion detector, a battery and a transmitter is positioned within the tire. Once the tire is traveling at a predetermined velocity, power is supplied to the mechanical air pressure sensor. When the tire pressure drops below a predetermined level, the mechanical air pressure sensor provides power to the transmitter which generates a signal to a receiver and cab mounted alarm. |
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DETAILED DESCRIPTION A tire condition monitoring system is provided which informs the driver of the condition, including air pressure, of one or more of the tires so that the driver is alerted when a tire is deflated.
Other engineering data, including tire temperature, can also be relayed to the driver or maintenance personnel.
The system is cost-effective and reliable and can be used by non-technical personnel for the life of the tire.
In accordance with the invention, a tire condition monitoring device having a unique identification code is positioned within a pneumatic tire.
The tire condition monitoring device includes a battery, at least one sensor in electrical circuit with the battery, a programmable microprocessor in circuit with the battery, a transmitter in circuit with the battery and a pick-up coil in electrical circuit with the microprocessor.
The sensors include a pressure sensor and a temperature sensor.
The transmitter includes a SAW filter for pulse modulated transmissions.
The unique identification code comprises a multiple bit code which specifically identifies the device.
The monitoring device is securely attached to either a rim for the tire or an inner surface of the tire itself.
The tire condition monitoring device is shipped in a dormant mode.
After installation, the monitoring device can be activated and assigned a tire location by pressurizing each tire to a predetermined level to activate the monitoring device from a dormant state to an operational state.
Alternatively, the monitoring device is activated and assigned a tire location by use of a portable hand-held wand transmitter.
This is accomplished by holding the hand-held transmitter close to the tire and actuating a switch of a keypad on the hand-held transmitter and subsequently transmitting a signal to the monitoring device through the tire.
The keypad has at least one switch to assign a tire location for every tire on the vehicle.
The tire condition monitoring device periodically senses a condition within the tire, including measurement of tire temperature and/or air pressure
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