1. A time division multiple access (TDMA) control method used by a mobile radio frequency identifier (RFID) reader, the method comprising:
requesting a channel used to perform an RFID communication with a tag via an uplink channel for a base transceiver station according to a protocol of a corresponding mobile communication network; and
receiving at least one piece of channel information among a transmission channel and a transmission window via a downlink channel from the base transceiver station according to the protocol of the corresponding mobile communication network.
2. The method of claim 1, wherein the transmission window includes information about the number and location of time slots.
3. The method of claim 2, wherein the time slots are generated based on a system clock synchronized to a specific pattern of a frame broadcasted by the base transceiver station.
4. The method of claim 1, further comprising: transmitting historic information collected during an inventory round to the base transceiver station after the inventory round ends.
5. The method of claim 1, further comprising: exchanging the at least one piece of channel information with another mobile RFID reader.
6. The method of claim 1, wherein the mobile communication network comprises a global system for mobile communication (GSM) network, an universal mobile telecommunications system (UMTS) network, a code division multiple access (CDMA) network, and a wideband-CDMA (W-CDMA) network.
7. A TDMA control method used by a mobile RFID reader, the method comprising:
requesting a channel used to perform an RFID communication with a tag via an random access channel (RACH) for a base transceiver station that covers a mobile communication network cell to which a specific frequency spectrum is allocated; and
receiving at least one piece of channel information among a transmission channel and a transmission window via an access grant channel (AGCH) from the base transceiver station.
8. The method of claim 7, wherein the transmission window includes information about the number and location of time slots.
9. The method of claim 8, wherein the time slots are generated based on a system clock synchronized to a specific pattern of a burst frame received via a broadcast control channel from the base transceiver station.
10. The method of claim 7, further comprising: transmitting historic information collected during an inventory round to the base transceiver station via the RACH after the inventory round ends.
11. A TDMA control method used by a mobile RFID reader by using a base transceiver station, the method comprising:
receiving a request of the mobile RFID reader for a channel used to perform an RFID communication with a tag via an uplink channel according to a protocol of a corresponding mobile communication network; and
allocating at least one piece of channel information among a transmission channel and a transmission window via a downlink channel according to the protocol of the corresponding mobile communication network in response to the request.
12. The method of claim 11, wherein the transmission window includes information about the number and location of time slots.
13. The method of claim 11, wherein the base transceiver station manages cells of a region to which a part of a frequency spectrum covered by the mobile communication network is allocated.
14. The method of claim 11, wherein the mobile communication network comprises a GSM network, an UMTS network, a CDMA network, and a W-CDMA network.
15. A mobile RFID reader comprising:
a mobile communicating unit requesting a channel used to perform an RFID communication via an uplink channel for a base transceiver station according to a protocol of a corresponding mobile communication network, and receiving at least one piece of channel information among a transmission channel and a transmission window via a downlink channel from the base transceiver station according to the protocol of the corresponding mobile communication network; and
an RFID reader unit performing the RFID communication with a tag based on the at least one piece of channel information.
16. The mobile RFID reader of claim 15, wherein the transmission window includes information about the number and location of time slots.
17. The mobile RFID reader of claim 16, wherein the RFID reader unit generates time slots based on a system clock synchronized to a specific pattern of a frame broadcasted by the base transceiver station.
18. The mobile RFID reader of claim 15, wherein the mobile communication network comprises a GSM network, an UMTS network, a CDMA network, and a W-CDMA network.
19. A mobile RFID communication system comprising:
a mobile communication network base station allocating at least one piece of channel information among an RFID transmission channel and an RFID transmission window via a channel according to a protocol of a network; and
a mobile station comprising an RFID reader, generating time slots based on a specific pattern of a burst frame broadcasted by the base station, and performing an RFID communication with a tag during a designated time slot in a frequency allocated in response to the request of the channel information.
20. The mobile RFID communication system of claim 19, wherein the mobile communication network comprises a GSM network, an UMTS network, a CDMA network, and a W-CDMA network.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method of operating a compression ignition engine on different fuels at different times comprising:
selecting a target fuel whose engine operating characteristics are to be duplicated when using fuels other than the target fuel in the engine;
determining the engine operating characteristics, including a measure of engine torque versus throttle setting and engine RPM when operating with the target fuel, and storing a desired indicated torque versus throttle setting and engine RPM; and
when the engine is operating on a fuel;
sensing a fuel control input and engine RPM;
determining the desired indicated torque for that fuel control input and engine RPM;
determining a measured indicated torque for the engine; and
adjusting a fuel quantity command to cause the measured indicated torque to equal the desired indicated torque;
whereby when the engine is operating on a fuel other than the target fuel, the engine torque for various fuel control inputs and engine RPM will equal the engine torque for that fuel control input and engine RPM as if operating on the target fuel.
2. The method of claim 1 further comprising when the engine is operating on a fuel, determining
an open loop fuel command for that fuel control input and engine RPM;
sensing cylinder pressure and crankshaft angle and calculating a measured indicated torque.
3. The method of claim 2 wherein the engine operating characteristics are stored in look-up tables.
4. The method of claim 3 wherein in the case of look-up tables with two variables to find a third variable, interpolation between values in both directions is used.
5. The method of claim 2 wherein the desired indicated torque is determined from a look-up table using desired torque and engine RPM, where the desired torque is determined from the engine RPM and the fuel control.
6. The method of claim 5 wherein the engine is a camless engine having electronic controlled engine valves, and further comprising:
providing a control signal, determined from a look-up table using desired torque and engine RPM, to a valve actuation controller.
7. The method of claim 2 wherein in a multi-cylinder engine, the sensing of the cylinder pressure and crankshaft angle, the calculating of a measured indicated torque, and the adjusting of the open loop fuel command are done on a cylinder by cylinder basis.
8. The method of claim 2 further comprising determining injection timing from the engine RPM and making a fuel timing adjustment to provide a fuel timing command to an electronic fuel control based on a measured start of combustion determined, at least in part, from the sensed cylinder pressure.
9. The method of claim 8 wherein one or more parameters defining the operation of the engine on a fuel other than the target fuel are self adaptive based on feedback of one or more variables relating to engine performance.
10. The method of claim 8 wherein the measured start of combustion is determined from the cylinder pressure and crankshaft angle based in a calculated heat release using compressible gas laws.
11. The method of claim 8 wherein the injection timing is determined from the engine RPM using a look-up table.
12. The method of claim 2 further comprising providing an EGR valve control signal responsive to the desired indicated torque and engine RPM.
13. The method of claim 2 further comprising providing a turbocharger control signal responsive to the desired indicated torque and engine RPM.
14. The method of claim 2 wherein the engine has a hydraulic engine valve actuation system and further comprising providing a hydraulic engine valve actuation system control signal responsive to the desired indicated torque and engine RPM.