54results about How to "Improve real-time communication" patented technology

The invention relates to an initiative appointment-making type intelligent elevator dispatching system. The initiative appointment-making type intelligent elevator dispatching system comprises a mobile phone client terminal, a dispatching total server, a local intelligent elevator dispatching server and an elevator controller, wherein the mobile phone client terminal is used for collecting and transmitting user elevator taking information; the dispatching total server is connected with the mobile phone client terminal in a wireless communication mode, receives and distributes the user elevator taking information transmitted by the mobile phone client terminal, and meanwhile transmits feedback information to the mobile phone client terminal; the local intelligent elevator dispatching server is connected with the dispatching total server in a wireless communication mode or a wired internet mode, receives the user elevator taking information distributed through the dispatching total server, obtains an elevator route planning scheme and anticipated waiting time according to the information, and feeds back the elevator route planning scheme and the anticipated waiting time to the dispatching total server; the elevator controller is connected with the local intelligent elevator dispatching server, and controls parking of an elevator according to the elevator route planning scheme transmitted by the local intelligent elevator dispatching server. Compared with the prior art, the initiative appointment-making type intelligent elevator dispatching system has the advantages that congestion of the elevator in concentrated using sections such as morning-evening rush hours is relieved, and the energy consumption of the elevator is saved.

The invention provides a method for synchronizing control and communication of an Ethernet system. The method comprises the steps of setting a state identification for a control task; itinerantly scanning a current time during the operation of a device, and respectively transmitting a periodic message and an aperiodic message within a periodic message time slice and an aperiodic message time slice; when the transmission of the periodic message and the aperiodic message is completed, judging whether the state identification of the control task is 1; if yes, namely meaning that the control task is not executed within a current macro period, executing the control task, and setting the state identification of the control task to be 0; and otherwise, namely meaning that the control task is executed within the current macro period, abandoning the execution of the control task. According to the method, the period synchronization of a user layer function block achieving a control function and link layer communication achieving a communication function can be achieved, the invalid execution of the function block and the invalid transmission of data can be avoided, and the operation efficiency and communication real-time performance of the system can be effectively improved. The method can be widely applied to the field of the industrial control.

Optical fiber as transmission media is adopted in the annular CAN bus network including each CAN node, module of photovoltaic conversion and deducted network interface. The invented CAN bus network does not use CAN transceiver. Advantages of the ring type optical fiber CAN bus network are: eliminating network blocking, reliable communication, simple circuit and high interference immunity. Interference killing feature of optical fiber CAN network being better than twisted-pair CAN network meets requirements on site of inclement industries.

The invention discloses a control method for an unattended drainage system in a coal mine. The drainage system includes a DSP digital signal processor module, a communication circuit module and a power supply module. The input terminal of the DSP digital signal processor module is connected with a digital quantity input isolation circuit Module and signal conditioning circuit module, the input terminal of the signal conditioning circuit module is connected with a temperature sensor, a vacuum sensor for detecting the vacuum degree at the inlet of the water pump, a flow sensor for detecting the flow rate of the drainage pipeline, and a sensor for detecting the pressure at the outlet of the water pump A pressure sensor and a liquid level sensor for detecting the water level in the water tank, and the output terminal of the DSP digital signal processor module are connected with a D / A conversion circuit module, a display module and an audible and visual alarm circuit module. The unattended drainage control system of the present invention is reasonably designed, combined with the control method, can realize automatic drainage in coal mines, has stable and reliable drainage performance, good use effect, and is convenient for popularization and use.

The invention discloses a system and method for maintaining the indoor air environment of an intelligent building. The intelligent building is divided into multiple building spaces. The system includes: multiple groups for distributed layout and calculation; each group includes control and decision-making Module, multiple air quality sensors and multiple air environment maintenance equipment, the air quality sensor is used to collect the air quality data of the corresponding building space, the air environment maintenance equipment is used to maintain and regulate the air quality of the corresponding building space, and the control decision module is used to Analyze, calculate and determine the control strategy for the air quality data of the corresponding building space, and issue control instructions to the air environment maintenance equipment in the corresponding building space; the central server is used to process preset tasks, data transmission between groups, and each group Operation status monitoring and group structure adjustment. It has the advantages of reducing the communication load, improving the real-time performance of communication, and fully optimizing each maintenance device in a targeted manner.

The invention discloses an advertisement player connection realization method and a system based on UUIDs. A first connection UUID is distributed to each connection of an advertisement player and a server, a second connection UUID is distributed to each connection of a control terminal and a server, and a connection UUID mapping table stored in the server is relevant to the connection of the control terminal and the advertisement player so that the connection number of the advertisement player and the control terminal is not limited, the communication real-time performance is high, the data transmission is stable and reliable, and the concurrent performance is good.