# US 2018/0320956 A1 · Method and system for feedback-based load control of a climate control system in transport > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0320956 A1 - Document ID: US20180320956A1 - Status: Published application - Kind: A1 - Application number: 15/587,010 - Filed: 2017-05-04 - Published: 2018-11-08 - Earliest claimed: 2017-05-04 - Assignees: Thermo King Corporation - Applicants: Thermo King Corporation - Inventors: Ryan Wayne SCHUMACHER; Matthew S. NELSON; Kyle MCMONIGAL - Web page: https://patentgrep.com/patent/US20180320956A1 ## CPC - F25D 29/003: {for movable devices} - B60H 1/3232: {particularly adapted for load transporting vehicles (B60H1/3226 takes precedence)} - F25B 49/02: for compression type machines, plants or systems - F25D 11/003: {Transport containers} - H02J 1/14: Balancing load and power generation in DC networks - F25B 2600/111: of condenser fans - F25B 2600/112: of evaporator fans - F25B 2700/15: Power, e.g. by voltage or current - H02J 2105/30: the load networks being external to vehicles, i.e. exchanging power with vehicles - F25D: REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR (refrigerated showcases A47F3/04; thermally-insulated vessels for domestic use A47J41/00; refrigerated vehicles, see the appropriate subclasses of classes B60 - B64; containers with thermal insulation in general B65D81/38; heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants, or materials for the production of heat or cold by chemical reactions other than by combustion C09K5/00; thermally-insulated vessels for liquefied or solidified gases F17C; air-conditioning or air-humidification F24F; refrigeration machines, plants, or systems F25B; cooling of instruments or comparable apparatus without refrigeration G12B) - B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract Methods and systems for feedback-based load control of a climate control system while in transport are provided. The method can include monitoring a current demand from each of a plurality of DC components of the climate control system. The method can also include determining whether the current demand for two or more of the plurality of DC components is in a discontinuous DC format. Also, the method can include, when two or more of the plurality of DC components is in the discontinuous DC format, determining a synchronization pattern for supplying power to the two or more of the plurality of DC components. Further, the method can include a DC power source of the climate control system directing power to the two or more of the plurality of DC components in the discontinuous DC format based on the synchronization pattern. ## Claims ### Claim 1 A feedback-based load control method for a climate control system transport, the method comprising: monitoring a current demand from each of a plurality of DC components of the climate control system; determining whether the current demand for two or more of the plurality of DC components is in a discontinuous DC format; when two or more of the plurality of DC components is in the discontinuous DC format, determining a synchronization pattern for supplying power to the two or more of the plurality of DC components; a DC power source of the climate control system directing power to the two or more of the plurality of DC components in the discontinuous DC format based on the synchronization pattern. ### Claim 2 (depends on 1) The method of claim 1, wherein determining whether the current demand for two or more of the plurality of DC components are in the discontinuous DC format includes determining for each of the plurality of DC components whether the current demand has a ripple current waveform. ### Claim 3 (depends on 1) The method of claim 1, wherein the synchronization pattern is a pattern for phasing the current demand such that a peak in the current demand for a first DC component of the two or more of the plurality of DC components in the discontinuous DC format occur at a different time than a peak in the current demand for a second DC component of the two or more of the plurality of DC components in the discontinuous DC format. ### Claim 4 (depends on 1) The method of claim 1, wherein directing power to the two or more of the plurality of DC components in the discontinuous DC format based on the synchronization pattern includes phase canceling the current demand from the two or more DC components in the discontinuous DC format. ### Claim 5 (depends on 1) The method of claim 1, wherein when two DC components are in the discontinuous DC format, the synchronization pattern phases a peak of the current demand of a first DC component in the discontinuous DC format 180° from a peak of the current demand of a second DC component in the discontinuous DC format. ### Claim 6 (depends on 1) The method of claim 1, wherein When three DC components are in the discontinuous DC format, the synchronization pattern phases a peak of the current demand of a first DC component in the discontinuous DC format 120° from a peak of the current demand of a second DC component in the discontinuous DC format, and phases the peak of the current demand of the second DC component 120° from a peak of the current demand of a third DC component in the discontinuous DC format. ### Claim 7 A feedback-based load control system for a climate control system in transport, the feedback-based load control system comprising: a plurality of DC components for operating the climate control system; a DC power source supplying power to the plurality of DC components; and a controller that: monitors a current demand from each of the plurality of DC components, determines whether the current demand for the two or more of the plurality of DC components is in a discontinuous DC format, and when two or more of the plurality of DC components is in the discontinuous DC format determines a synchronization pattern for supplying power to the two or more of the plurality of DC components, instructs the DC power source to supply power to the two or more of the plurality of DC components based on the synchronization pattern, wherein the DC power source directs power to the two or more of the plurality of DC components in the discontinuous DC format based on the synchronization pattern. ### Claim 8 (depends on 7) The feedback-based load control system of claim 7, Wherein each of the plurality of DC components is at least one of a condenser fan, an evaporator blower, a fuel pump, and a drain tube heater. ### Claim 9 (depends on 7) The feedback-based load control system of claim 7, wherein the controller determines whether the current demand for two or more of the plurality of DC components are in the discontinuous DC format by determining for each of the plurality of DC components whether the current demand has a ripple current waveform. ### Claim 10 (depends on 7) The feedback-based load control system of claim 7, wherein the synchronization pattern is a pattern for phasing the current demand such that a peak in the current demand for a first DC component of the two or more of the plurality of DC components in the discontinuous DC format occur at a different time than a peak in the current demand for a second DC component of the two or more of the plurality of DC components in the discontinuous DC format. ### Claim 11 (depends on 7) The feedback-based load control system of claim 7, wherein the DC power source directs power to the two or more of the plurality of DC components in the discontinuous DC format based on the synchronization pattern to phase cancel the current demand from the two or more DC components in the discontinuous DC format. ### Claim 12 (depends on 7) The feedback-based load control system of claim 7, wherein when the controller determines that two DC components of the plurality of DC components are in the discontinuous DC format, the synchronization pattern phases a peak of the current demand of a first DC component in the discontinuous DC format 180° from a peak of the current demand of a second DC component in the discontinuous DC format. ### Claim 13 (depends on 7) The feedback-based load control system of claim 7, wherein when the controller determines that three DC components of the plurality of DC components are in the discontinuous DC format, the synchronization pattern phases a peak of the current demand of a first DC component in the discontinuous DC format 120° from a peak of the current demand of a second DC component in the discontinuous DC format, and phases the peak of the current demand of the second DC component 120° from a peak of the current demand of a third DC component in the discontinuous DC format. ### Claim 14 (depends on 7) The feedback-based load control system of claim 7, further comprising: a battery module that supplies power to the plurality of DC components when the DC power source is unavailable; and a battery charger that charges the battery module, wherein the DC power source supplies power to the battery charger. ### Claim 15 A refrigerated transport unit comprising: a transport unit; and a transport refrigeration system for providing climate control within the transport unit, the transport refrigeration system including a compressor, a condenser, an evaporator, a plurality of DC components for operating the transport refrigeration system, and a feedback-based load control system, wherein the feedback-based load control system includes: a DC power source supplying power to the plurality of DC components, and a controller that: monitors a current demand from each of the plurality of DC components, determines whether the current demand for the two or more of the plurality of DC components is in a discontinuous DC format, and when two or more of the plurality of DC components is in the discontinuous DC format determines a synchronization pattern for supplying power to the two or more of the plurality of DC components, instructs the DC power source to supply power to the two or more of the plurality of DC components based on the synchronization pattern, and wherein the DC power source directs power to the two or more of the plurality of DC components in the discontinuous DC format based on the synchronization pattern. ### Claim 16 (depends on 15) The refrigerated transport unit of claim 15, wherein each of the plurality of DC components is at least one of a condenser fan, an evaporator blower, a fuel pump, and a drain tube heater. ### Claim 17 (depends on 15) The refrigerated transport unit of claim 15, wherein the controller determines whether the current demand for two or more of the plurality of DC components are in the discontinuous DC format by determining for each of the plurality of DC components whether the current demand has a ripple current waveform. ### Claim 18 (depends on 15) The refrigerated transport unit of claim 15, wherein the synchronization pattern is a pattern for phasing the current demand such that a peak in the current demand for a first DC component of the two or more of the plurality of DC components in the discontinuous DC format occur at a different time than a peak in the current demand for a second DC component of the two or more of the plurality of DC components in the discontinuous DC format. ### Claim 19 (depends on 15) The refrigerated transport unit of claim 15, wherein the DC power Source directs power to the two or more of the plurality of DC components in the discontinuous DC format based on the synchronization pattern to phase cancel the current demand from the two or more DC components in the discontinuous DC format. ### Claim 20 (depends on 15) The refrigerated transport unit of claim 15, further comprising: a battery module that supplies power to the plurality of DC components when the DC power source is unavailable; and a battery charger that charges the battery module, wherein the DC power source supplies power to the battery charger.