Orientation-based wireless sensing apparatus
An orientation-based wireless sensor includes a transmitter unit having a body housing a microprocessor, a transmitter, and an accelerometer for detecting the orientation of the transmitter unit relative to one-, two- or three-axis of the direction of the pull of earth's gravity. The transmitter body is mounted on a feature of a vehicle that it is desirable to monitor. The transmitter will transmit orientation data at predetermined time intervals to a receiver on the vehicle, which will in turn process the information, adding additional information, such as GPS location, and wirelessly send the data to a database that is available to a customer over the Internet.
1. An orientation-based wireless sensing apparatus, comprising:
a body mounted on a component desired to be monitored for its orientation relative to the direction of gravity;
an accelerometer mounted to the body;
a microprocessor connected to the accelerometer;
a transmitter connected to the microprocessor;
a power source connected to the accelerometer, the microprocessor and the transmitter; and
an antenna connected to the transmitter.
2. The orientation-based wireless sensing apparatus of claim 1 , wherein the accelerometer is configured to measure along first and second orthogonal axes of the direction of gravity.
3. The orientation-based wireless sensing apparatus of claim 2 , wherein the accelerometer is configured to measure along first, second, and third orthogonal axes of the direction of gravity.
4. The orientation-based wireless sensing apparatus of claim 3 , wherein the accelerometer comprises a first two-axis accelerometer and a second single-axis accelerometer.
5. The orientation-based wireless sensing apparatus of claim 3 , further comprising:
a hinge;
a mounting plate attached to a wall of the body and having a first side edge; and
a hinge plate pivotally connected along the first side edge of the mounting plate by the hinge.
6. A vehicle having at least one operable feature to be monitored, the operable feature including a component that moves between first and second positions, the vehicle comprising:
an orientation-based wireless sensing apparatus mounted on the vehicle and positioned to monitor the operable feature and transmit an orientation of the component relative to the direction of gravity, including:
a receiver unit configured to receive transmitted data packets from at least one transmitter unit on the vehicle and to wirelessly transmit data packets from the vehicle; and
a transmitter unit mounted on the component and including:
a body attached to the component;
an accelerometer mounted to the body;
a microprocessor connected to the accelerometer;
a transmitter connected to the microprocessor;
a power source connected to the accelerometer, the microprocessor and the transmitter; and
an antenna connected to the transmitter;
said microprocessor operable to receive orientation data relative to the component from the accelerometer, process the data, and transmit the processed data as a data packet through the transmitter to the receiver unit.
7. The vehicle of claim 6 , wherein the operable feature includes a door operable between open and closed positions, and wherein the transmitter unit is mounted on said door.
8. The vehicle of claim 6 , wherein the operable feature is a hand brake, wherein the component is a bell crank operably interposed in the handbrake, and wherein the transmitter unit is mounted on the bell crank.
9. The vehicle of claim 6 , wherein the transmitter unit further includes:
a hinge;
a mounting plate attached to a wall of the body, the mounting plate having a first side edge; and
a hinge plate pivotally connected along the first side edge of the mounting plate by the hinge.
10. The vehicle of claim 9 , wherein the operable feature is a wheelset of the vehicle having compression springs supporting one end of a bolster;
wherein the wheelset has a sideframe which does not move relative to the compression of the springs and the bolster supported on those springs;
wherein the component is the bolster end supported on the springs, movable between a lower compressed position when the vehicle is loaded, and an upper uncompressed position when the vehicle is not loaded;
wherein the hinge plate is secured to the bolster end and a portion of the mounting plate is operably supported on the wheelset sideframe, the transmitter unit positioned such that movement of the bolster end between the upper and lower positions will cause a change of orientation of the body of the transmitter unit, which is measured by the accelerometer as a change in angle of orientation relative to the direction of gravity.
11. The vehicle of claim 6 , further comprising circuitry connected between the power supply and the microprocessor to maintain a minimum operating voltage and minimum operating current.
12. The vehicle of claim 11 , wherein the circuitry includes:
an electrical lead between the power supply and the microprocessor, the electrical lead having a voltage dropping resistor interposed therein to present a lower voltage to the microprocessor therefore causing the microprocessor to consume less current;
a bypass lead electrically connecting the power supply and the microprocessor and bypassing the resistor; and
a switch operable between open and closed positions and interposed in the bypass lead; and
a voltage detector configured to detect a voltage in the electrical lead and close the switch when the voltage drops to a predetermined value.
13. The vehicle of claim 6 , wherein the transmitter is programmed to transmit data packets at predetermined time intervals, and wherein the receiver unit is programmed to power up at the predetermined time intervals and power down between the predetermined time intervals.
14. A vehicle having a plurality of operable features that it is desired to monitor, each operable feature including a component that moves between first and second positions, the vehicle comprising:
an orientation-based wireless sensing apparatus mounted on the vehicle and operable to monitor the operable features and transmit an orientation of each component relative to the first and second positions, including:
a receiver unit configured to receive transmitted data packets from a plurality of transmitter units on the vehicle and to wirelessly transmit data packets from the vehicle; and
a plurality of transmitter, each transmitter unit mounted on one of the components of one of the operable features, each transmitter unit including:
a body attached to the component;
an accelerometer mounted to the body;
a microprocessor connected to the accelerometer;
a transmitter connected to the microprocessor;
a power source connected to the accelerometer,
the microprocessor and the transmitter; and
an antenna connected to the transmitter;
said microprocessor operable to receive orientation data relative to the component from the accelerometer, process the data, and transmit the processed data as a data packet through the transmitter to the receiver unit;
each transmitter unit having a unique identification code associated therewith, and each microprocessor of each transmitter unit programmed to transmit the identification code as part of the data packet transmitted to the receiver unit; and
said receiver unit including a database of the identification codes of each of the transmitter units on the vehicle, and operable to monitor and process only those data packets received from designated transmitters.
15. The vehicle of claim 14 , wherein each transmitter is programmed to transmit data packets at predetermined time intervals, and wherein the microprocessor in the receiver unit is programmed to power up at the predetermined time intervals of each of the transmitters and power down between the predetermined time intervals.