Class / Patent application number | Description | Number of patent applications / Date published |
062228300 | By refrigerant pressure | 17 |
20080276636 | Method For Controlling a Refrigeration System - A method for controlling a refrigeration system comprising a variable compressor capacity, and at least two refrigeration entities, e.g. display cases. Suction pressure is controlled by means of permitting/preventing a flow of refrigerant into evaporator of one or more refrigeration entities. Compressor capacity is controlled to match a desired capacity level and based on a signal derived from one or more properties of the one or more refrigeration entities, said signal reflecting a possible difference between the current compressor capacity and a current refrigeration demand of the refrigeration system. Reduces wear on compressors because switching them ON/OFF is avoided to the largest extent possible. Prevents problems relating to conflicting control strategies due to control parameters, e.g. suction pressure, being controlled by means of two or more controllable parts, e.g. compressors and flow of refrigerant into refrigeration entities. | 11-13-2008 |
20080295532 | Compressor inlet pressure estimation apparatus for refrigeration cycle system - A compressor inlet pressure estimation apparatus for a refrigeration cycle system is disclosed. An electronic control unit | 12-04-2008 |
20080307811 | SYSTEM AND METHOD FOR CONTROLLING A COMPRESSOR - The embodiments described herein include a control system and method for a compressor that is operable with a climate system. The control system enables optimal climate system operation by efficiently controlling the operating speed of the compressor. | 12-18-2008 |
20080307812 | CONTROL VALVE FOR COMPRESSOR - To improve the pressure resistance strength of a pressure-sensing section of a control valve for a internal variable control compressor. In the control valve, a stack of snap-acting discs is disposed on a side of a diaphragm forming the pressure-sensing section opposite from a transmitting member. With this arrangement, even if the diaphragm receives large suction pressure Ps, since the snap-acting disc receives suction pressure Ps from the opposite side, the diaphragm is prevented from being broken or deformed. This makes it possible to improve the pressure resistance strength of the pressure-sensing section. As a result, even if the control valve is applied to a refrigeration cycle in which suction pressure Ps becomes high, such as one using carbon dioxide as refrigerant, it is possible to secure sufficient pressure resistance strength. | 12-18-2008 |
20080314056 | Linear-Compressor Control System, a Method of Controlling a Linear Compressor and a Linear Compressor - A linear compressor control system includes an electronic circuit controlling an electric motor that drive a piston of the compressor, such that the motor is operated intermittently with an on-time (t | 12-25-2008 |
20090000322 | Control device and control method for air conditioning device - A control device for an air conditioning device including a variable capacity compressor which has a variable capacity actuator, includes a full stroke control setting value computation module which is configured such that, when a capacity control output value output to the variable capacity actuator is increased greater than a full stroke value which results the variable capacity compressor reaching a full stroke, and when a differential pressure that is proportional to the capacity control output value is verified to be no longer maintained, backtracks to a point of time when a differential pressure maintenance function of the variable capacity compressor is lost, and computes a full stroke control setting value of the variable capacity compressor that a discharge capacity of the variable capacity compressor is saturated, based on the capacity control output value obtained at the point of time when the differential pressure maintenance function of the variable capacity compressor is lost. | 01-01-2009 |
20090120113 | REFRIGERATION SYSTEM - When a guard timer of a compressor ( | 05-14-2009 |
20100095693 | SUCTION MODULATION VALVE FOR REFRIGERANT SYSTEM WITH ADJUSTABLE OPENING FOR PULSE WIDTH MODULATION CONTROL - A pulse width modulation control is provided for a suction modulation valve in a refrigerant system. An intentional small “leakage” path is maintained through the suction modulation valve to ensure that the pressure inside the compressor shell does not decrease below a safe reliability threshold but, at the same time, does not exceed a certain value, which would cause the refrigerant system to operate inefficiently, when the pulse width modulation control has moved the suction modulation valve to a closed position. The size of this minimum “leakage” path is continuously adjusted to ensure that the optimum pressure inside the compressor shell is maintained regardless of the evaporator pressure and other operating conditions. | 04-22-2010 |
20100139301 | TEMPERATURE CONTROL THROUGH PULSE WIDTH MODULATION - A refrigerant compressor assembly for a refrigeration circuit controls the temperature within a temperature controlled space. The refrigerant compressor assembly includes a first unloading valve, a first valve actuator, and a first valve control system that adjusts the first valve actuator via a pulse-width-modulated signal, a second unloading valve, a second valve actuator, and a second valve control system that adjusts the second valve actuator via a pulse-width-modulated signal. The refrigerant compressor assembly also includes a third unloading valve. The first valve actuator is coupled to the first and third unloading valves and controlled by the first valve control system. The unloading valves selectively allow or resist fluid flow from higher to lower pressure areas within the refrigerant compressor assembly. | 06-10-2010 |
20100146998 | Refrigeration apparatus - There is provided a refrigeration apparatus in which a refrigerant accumulating in non-operating outdoor units is supplied to an outdoor unit being operated in which a shortage of refrigerant occurs without starting the compressors of the non-operating outdoor units. In the control method for the refrigeration apparatus in which to refrigerant piping | 06-17-2010 |
20100175401 | DISPLACEMENT CONTROL SYSTEM FOR A VARIABLE DISPLACEMENT COMPRESSOR - A discharge displacement control system for a variable displacement compressor includes controlled object setting means. The controlled object setting means selects a control mode out of two or more control modes in accordance with external information detected by external information detection means, and sets a controlled object matching the selected control mode. In accordance with the external information detected by the external information detection means, the controlled object setting means sets, as the controlled object, a target pressure for one of a pressure in a suction pressure region and a pressure in a crank chamber in a first control mode, which is one of the control modes, and a target working pressure difference between a pressure in a discharge pressure region and one of the pressure in the suction pressure region and the pressure in the crank chamber in a second control mode, which is another of the control modes. | 07-15-2010 |
20110005251 | Compressor discharge valve providing freeze and charge migration protection - A refrigerant system includes a compressor with a discharge valve that temporarily restricts the compressor's outflow at startup so that the discharge pressure can quickly rise to force lubricant back to the compressor. The discharge valve also helps prevent an axial face of a rotor of a screw compressor from rubbing against a bearing housing axial face of the compressor's housing. When the system turns off under certain low ambient air temperature conditions, the valve closes to help prevent the system's evaporator from freezing up. The discharge valve includes a novel arrangement of a piston, a valve stem extending from the piston, and a valve plug pivotally attached to the valve stem. The pivotal connection ensures a positive seal between the valve plug and a valve seat. A somewhat restricted fluid passageway between the valve's discharge chamber and piston chamber helps prevent the valve from chattering as the valve opens. | 01-13-2011 |
20110120164 | METHOD AND APPARATUS FOR EQUALIZING A PUMPED REFRIGERANT SYSTEM - A cooling system is provided that comprises: a refrigerant loop having a pump; an evaporator heat exchanger thermally coupled to a heat source, the evaporator plumbed in the loop; a condensing heat exchanger and a receiver plumbed in the loop; and an equalizing conduit plumbed between an inlet to the condenser and the receiver and comprising a flow regulating valve. | 05-26-2011 |
20110167853 | COOLING SYSTEM - Both of maintenance of cooling performance of low-temperature showcases and enhancement of energy saving performance of a refrigerating machine are enabled. | 07-14-2011 |
20110265506 | High Ratio Mobile Electric HVAC System - An energy efficient and highly versatile electrically-powered air conditioning and heating system for mobile vehicles. Multiple variable-speed compressors operate in series and parallel modes giving an exceptionally wide range of operating capacity making the system suitable for combined on-highway and no-idle use in trucks. In series mode, the single-stage compressors function like a two-stage compressors for increased energy efficiency. A unique power control and storage system has multi-voltage input and output capability without the use of DC-DC or DC-AC converters. A battery management system is incorporated which is compatible with all advanced battery technologies and offers cell-level charge and discharge control. | 11-03-2011 |
20120247140 | VARIABLE DISPLACEMENT COMPRESSOR - A variable displacement compressor adjusts the pressure in a control pressure chamber and controls the displacement in accordance with the adjusted pressure. Refrigerant is supplied via a supply passage, and released via a bleed passage. The compressor includes a first control valve for adjusting the cross-sectional area of the supply passage for refrigerant. The compressor further includes a second control valve that adjusts the cross-sectional area of the bleed passage in accordance with the opening/closing state of the first control valve. The second control valve adjusts the cross-sectional area of the bleed passage such that the cross-sectional area when the first control valve is in the closed state is larger than that when the first control valve is in the opened state. The back pressure chamber is located in a section of the bleed passage that is located between the second control valve and the control pressure chamber. | 10-04-2012 |
20150052925 | REFRIGERATION APPARATUS AND REFRIGERATION CYCLE APPARATUS - A refrigeration apparatus includes a compressor receiving refrigerant through an injection pipe and of discharging the refrigerant, a condenser, an electronic expansion valve connected by piping to another end of the injection pipe, a subcooling coil, a solenoid valve configured to control inflowing of the refrigerant through the injection pipe into the compressor, an injection bypass pipe connecting the injection pipe and a pipe on a suction side of the compressor, a solenoid valve configured to control passage of the refrigerant flowing through the injection bypass pipe, a high-low pressure bypass pipe connecting a pipe on a discharge side of the compressor and the pipe on the suction side of the compressor, a solenoid valve configured to control passage of the refrigerant through the high-low pressure bypass pipe, and a controller configured to control a frequency of the compressor and opening and closing of each of the solenoid valves. | 02-26-2015 |