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Modular water chilling unit control method

A technology for chillers and control methods, which is applied in the directions of comprehensive factory control, electrical program control, heating and ventilation control systems, etc., can solve the problems of slow data exchange time and affect outdoor unit control, etc., to improve stability and improve data exchange. time, the effect of reducing communication failures

Active Publication Date: 2011-09-14
四川长虹空调有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the centralized controller controls the outdoor units by a single-chip microcomputer, and the maximum number M of outdoor units it can control is fixed, so the sending address of the centralized controller is continuous from 1 to M change, and the number N of outdoor units (the maximum cannot exceed M) may change. Since the number of N cannot be determined in real time, the maximum number control is generally adopted, that is, the centralized controller must send M addresses to the outdoor units each time. To carry out data communication with N outdoor units, this will cause M-N communication failures that should not have occurred, and the data exchange time is slow, which affects the control of the outdoor unit by the centralized controller

Method used

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Embodiment

[0018] Assuming that the maximum number controlled by the centralized controller is 128, the address of the centralized controller is coded as 0, and the outdoor unit is coded consecutively starting from 1 to ensure the uniqueness of the addresses of the centralized controller and the outdoor unit. When the centralized controller is powered on, the sending address starts from 1 to the outdoor unit and reaches the maximum address of 128. When the address of the outdoor unit is the same as the sending address of the centralized controller, a response signal is fed back to the centralized controller. After the centralized controller sends all the addresses, it counts the number of response signals, for example, 120. At this time, the centralized controller sends the address code to the outdoor unit again, and counts the number of response signals again. If it is also 120, then It can be determined that the number of outdoor units is now 120. Afterwards, when the centralized contro...

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Abstract

The invention relates to a method for controlling a module-typed water chiller. The invention discloses a method which can quickly determine the quantity of the outdoor machines and can carry out the control according to the quantity of the outdoor machines. The method comprises the steps as follows: a. an integrated controller sends an address code to the outdoor machine; b. after the outdoor machine receives the address code which is the same to the self-address of the outdoor machine, the outdoor machine feeds back a reply signal to the integrated controller; c. after the integrated controller completes sending the address code, the quantity N1 of all reply signals is counted; d. the step a is turned back to; after the address code is sent for the second time, the quantity N2 of all reply signals is counted; e. whether N1 is equal to N2 is judged, if so, the step f is executed and if not, the step a is executed; f. the quantity of the current outdoor machines is determined as N1; subsequently, before being powered down, the integrated controller only sends the address to N1 when communicating with the outdoor machines. The method automatically detects the quantity of the outdoor machines, reduces the unnecessary malfunction, improves the stability of the system and is suitable for the control system of the central air conditioner.

Description

technical field [0001] The invention relates to a central air-conditioning control system, in particular to a control method for a modular chiller. Background technique [0002] In the central air-conditioning system, the modular chiller includes a centralized controller and an outdoor unit that controls the compressor. During the control process, the centralized controller is used as the master address, and the outdoor unit is used as the slave address. Send a control command to the outdoor unit, and when the outdoor unit receives the same code as its own address, it exchanges data with the centralized controller. In the prior art, the centralized controller controls the outdoor units by a single-chip microcomputer, and the maximum number M of outdoor units it can control is fixed, so the sending address of the centralized controller is continuous from 1 to M change, and the number N of outdoor units (the maximum cannot exceed M) may change. Since the number of N cannot be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/00G05B19/418
Inventor 刘启武赵寰蒋伟
Owner 四川长虹空调有限公司
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