초록 ▼

A system and method for controlling traffic and traffic lights and selectively distributing warning messages to motorists includes a controller to determine appropriate action based on traffic congestion parameters. Fuzzy logic is used to determine optimum traffic light phase split based on the traf

A system and method for controlling traffic and traffic lights and selectively distributing warning messages to motorists includes a controller to determine appropriate action based on traffic congestion parameters. Fuzzy logic is used to determine optimum traffic light phase split based on the traffic information from the traffic information units. Global Positioning System technology is used by the system and method in order to track moving vehicles and signs and be able to communicate with them.

대표청구항 ▼

A system and method for controlling traffic and traffic lights and selectively distributing warning messages to motorists includes a controller to determine appropriate action based on traffic congestion parameters. Fuzzy logic is used to determine optimum traffic light phase split based on the traf

A system and method for controlling traffic and traffic lights and selectively distributing warning messages to motorists includes a controller to determine appropriate action based on traffic congestion parameters. Fuzzy logic is used to determine optimum traffic light phase split based on the traffic information from the traffic information units. Global Positioning System technology is used by the system and method in order to track moving vehicles and signs and be able to communicate with them. essor generating a bus request when access to said memory is required; and said microcontroller granting access to said memory in response to said bus request from said digital signal processor. 15. A method as defined in claim 14, wherein said digital signal processor and said microcontroller operate at different frequencies. 16. A method as defined in claim 14, further comprising said digital signal processor calculating one or more parameter values of a polyphase power line in response to the sensed voltage and current values and writing the calculated parameter values to said memory. 17. A method as defined in claim 14, further comprising said digital signal processor writing the calculated parameter value to said memory when access to said memory has been granted by said microcontroller, and said microcontroller reading the calculated parameter value from said memory when said microcontroller has access to said memory and supplying the calculated parameter value to a storage or display device. 18. A method as defined in claim 14, wherein the step of generating a bus request comprises generating a bus request interrupt to said microcontroller. 19. A method as defined in claim 18, wherein the step of granting access to said memory comprises generating a grant access interrupt to said digital signal processor. 20. A method as defined in claim 19, further comprising the step of said digital signal processor clearing said bus request interrupt. 21. A method as defined in claim 19, further comprising the step of said microcontroller clearing the grant access interrupt after a predetermined timeout period. 22. An electronic energy meter comprising: a sensing circuit for sensing voltage and current values of a polyphase power line; a memory having a memory bus; a digital signal processor coupled to said memory for calculating parameter values of the polyphase power line in response to the sensed voltage and current values, said digital signal processor comprising means for generating a bus request when access to said memory is required; and a microcontroller coupled to said memory for performing control functions of the electronic energy meter, said microcontroller comprising means for granting access to said memory in response to said bus request from said digital signal processor. 23. An electronic energy meter as defined in claim 22, wherein said digital signal processor comprises means for writing the calculated parameter values to said memory when access to said memory has been granted by said microcontroller and wherein said microcontroller comprises means for reading the calculated parameter values from said memory when said microcontroller has access to said memory and means for supplying the calculated parameter values to a storage or display device. 24. An electronic energy meter as defined in claim 22, wherein said digital signal processor and said microcontroller operate at different frequencies. 25. An electronic energy meter as defined in claim 22, wherein said microcontroller further comprises means for clearing the grant of access to said memory after a predetermined timeout period. 26. An electronic energy meter as defined in claim 22, wherein said digital signal processor further comprises means for clearing the bus request. 27. An electronic energy meter as defined in claim 22, wherein said sensing circuit is configured for digitizing the sensed voltage and current values of the polyphase power line. 28. An electronic energy meter as defined in claim 27, wherein said digital signal processor comprises means for calculating one or more parameter values of said polyphase power line in response to the digitized voltage and current values and means for writing the calculated parameter values to said memory.