CROSS REFERENCE TO RELATED APPLICATION

This application claims priority under 35 USC § 119 to Brazilian Patent Application No. BR102019003311-8 filed Feb. 18, 2019 (02/18/2019), and the entire disclosure of said application is hereby expressly incorporated by reference into the present application.

The present invention concerns a control method and a control system of a compressor in a refrigeration system through the implementation of at least one control logic based on the monitoring of parameters of the refrigeration system. The present invention also concerns a compressor of a refrigeration system.

The present invention concerns a control method and a control system of a compressor in a refrigeration system through the implementation of at least one control logic based on the monitoring of parameters of the refrigeration system. The present invention also concerns a compressor of a refrigeration system.

DESCRIPTION OF THE STATE OF THE ART

In recent decades, with advances in electronics, the refrigeration field has been revolutionized. The technologies developed allow for compressors to be smaller, more efficient and of improved performance when compared to those of constant speed. These results were only possible due to the use of the electronic inverter, which activates the motor at different speeds, allowing for the possibility of adjusting the capacity of refrigeration to an instantaneous demand.

Firstly, unlike the common ON/OFF compressors which require a simple mechanical thermostat, the variable capacity compressor depended on an electronic controller to adjust the desired speed. Since this solution comprises an additional cost to be implemented, a barrier has been initially created to bolstering this technology in the refrigeration market.

However, having observed the global goal for efficiency improvement and the possibility of leveraging the previously known concept, the present routine was developed. This resource allows the use of variable speed compressors with the same mechanical thermostat as an input signal for switching on and off, but allowing the inverter to decide the best speed based on the current status of the compressor. This means there are no changes in the system for the original manufacturer of the equipment, or other additional costs, and a better performance from the solution.

The original concept was conceived to adapt the refrigeration capacity based on the thermal demand, which is to say, depending on the load felt by the electric motor of the compressor, its speed may increase or reduce. More specifically, based on a verification of the behavior of for example, electric magnitude, it is possible to determine a behavior (tendency) of the load in the motor of the compressor, especially regarding the taking of certain decisions in the refrigeration system based on the behavior of the load.

PCT international application publication number WO98/15790, United States Patent U.S. Pat. No. 7,228,694B2 and also United States Patent document number US2013/0064684A1, for example, describe solutions based on a target time, lacking routines, steps and components configured to stabilize specific parameters of the refrigeration system and to recognize disturbances.

Up to the present, the solution worked adequately in the home appliances field, the residential user being the principal type of user of this resource. However, with the migration of the ON/OFF technology to the inverter in the commercial field, where there are many systems with different characteristics, this solution proved obsolete.

This is because variable speed compressors require an electronic thermostat to be controlled, which adds cost to the system. Allied to this, the levels of efficiency are not optimized because they do not take into account installed capacity in the refrigerator and have their performance reduced due to the fact that they do not respond to disturbances in the system.

More specifically, we do not observe in the state of the art, solutions configured to realize given cycles in order to stabilize a load of the refrigeration system (such as torque) and also to monitor the occurrence or otherwise of disturbances in the refrigeration system based on the measuring of a series of magnitudes related to the cited system.

OBJECTIVES OF THE INVENTION

One objective of the present invention is to provide a control method and a control system for a compressor in a refrigeration system.

One objective of the present invention is to provide a control method and a control system for a compressor in a refrigeration system which allows for the use of an ON/OFF thermostat in the control of the speed of a compressor.

One objective of the present invention is to provide a control method and a control system for a compressor in a refrigeration system which allows for the adjustment of the time cycles in accordance with the user's desire.

One objective of the present invention is measuring the mainly electrical and mechanical parameters of the refrigeration system.

One objective of the present invention is to identify and correct disturbances in the refrigeration system and to activate the compressor at an angular speed of greater efficiency for the cited refrigeration system.

One objective of the present invention is to provide a variable speed compressor configured in accordance with the method and system of control of the present invention.

BRIEF DESCRIPTION OF THE INVENTION

The objectives of the present invention are achieved by means of a control method and a control system for controlling a compressor in a refrigeration system using at least one general logic and one specific logic, where the general logic comprises at least one step of measuring torques and a step of measuring the cycle time, and the specific logic comprises at least one step of monitoring disturbances.

