Patents by Inventor Motohiro Yamaguchi
Motohiro Yamaguchi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20220011006Abstract: An air conditioner includes a heat pump cycle, a heating unit, a low-temperature side heat medium circuit, and a heat dissipation amount adjustment control unit. The heat pump cycle has a compressor, a condenser, a decompression unit, and an evaporator. The heating unit has a heating heat exchanger, an outside air radiator, and a heat dissipation amount adjustment unit. The low-temperature side heat medium circuit has a heat generation device. The heat dissipation amount adjustment control unit controls the heat dissipation amount adjustment unit to adjust a heat dissipation amount in the outside air radiator such that a blown air temperature of the blown air heated by the heating heat exchanger approaches a predetermined target temperature.Type: ApplicationFiled: September 24, 2021Publication date: January 13, 2022Inventors: Koji MIURA, Hiroaki KAWANO, Motohiro YAMAGUCHI, Kazuya TANIGUCHI, Yoshiki KATO, Masamichi MAKIHARA, Takahiro MAEDA, Kuniyoshi TANIOKA, Toru OKAMURA, Naoya MAKIMOTO, Atsushi YAMADA, Kenta KAYANO
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Publication number: 20220009309Abstract: A refrigeration cycle device includes a heat pump cycle, a high-temperature heat medium circuit, and a low-temperature heat medium circuit. The low-temperature heat medium circuit includes a plurality of heat absorption devices configured to have a heat absorption amount to be absorbed by the low-temperature heat medium flowing out of a low-temperature heat medium-refrigerant heat exchanger, and a heat absorption adjusting unit configured to change the heat absorption amount of the low-temperature heat medium in the respective heat absorption devices.Type: ApplicationFiled: September 24, 2021Publication date: January 13, 2022Inventors: Koji MIURA, Hiroaki KAWANO, Motohiro YAMAGUCHI, Kazuya TANIGUCHI, Yoshiki KATO, Masamichi MAKIHARA, Takahiro MAEDA, Kuniyoshi TANIOKA, Toru OKAMURA, Naoya MAKIMOTO
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Patent number: 9803904Abstract: A refrigerant cycle device for a vehicle includes a compressor which compresses and discharges refrigerant, a discharge capacity control portion which controls a discharge capacity of the compressor. The refrigerant cycle device further includes a noise determination portion which determines whether an audible noise other than a refrigerant passing noise is in a low noise state, and/or a load determination portion which determines whether an air-conditioning thermal load is in a high load state. The discharge capacity control portion performs a gradual activation control in which the discharge capacity of the compressor is set to be lower than that determined in a normal control, when the noise determination portion determines that the audible noise is in the low noise state, and/or when the load determination portion determines that the air-conditioning thermal load is in the high load state, at an activation time of the compressor.Type: GrantFiled: May 16, 2012Date of Patent: October 31, 2017Assignee: DENSO CORPORATIONInventors: Minoru Sasaki, Takashi Yamanaka, Takeshi Wakisaka, Motohiro Yamaguchi, Yasuaki Sasaki, Ken Matsunaga
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Patent number: 9371024Abstract: An air-conditioner conducts an air-conditioning for a passenger compartment of a vehicle, and has an eco-mode to save energy. The air-conditioner includes a seat temperature control system and a controller. The seat temperature control system is configured to operate to heat or cool a seat in the passenger compartment. The controller automatically activates the seat temperature control system when the eco-mode is set.Type: GrantFiled: February 6, 2013Date of Patent: June 21, 2016Assignee: DENSO CORPORATIONInventors: Yoshinori Ichishi, Yasushi Kondo, Yoshinori Yanagimachi, Satoshi Izawa, Motohiro Yamaguchi
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Patent number: 9150080Abstract: A cooling system of a battery which efficiently cools a high voltage battery which is mounted in an electric vehicle or a hybrid vehicle so as to maintain battery performance by using a refrigeration cycle of an air-conditioning system, which is provided with an electric compressor, outside heat exchanger, inside heat exchanger, and a control device. A refrigerant path of the air-conditioning system for running refrigerant is provided with a branch path having a heat exchanger which bypasses the inside heat exchanger, a medium path connected to the heat exchanger runs another refrigerant for cooling the battery, control valves are provided which adjust the amounts of the refrigerant which flows to the refrigerant path and the branch path, and, when the control valves run the refrigerant to both the refrigerant path and the branch path, the control device increases the speed of the electric compressor.Type: GrantFiled: May 23, 2012Date of Patent: October 6, 2015Assignee: DENSO CORPORATIONInventors: Takayuki Kamada, Yoshinori Ichishi, Yasushi Kondo, Satoshi Izawa, Motohiro Yamaguchi
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Publication number: 20120297805Abstract: A cooling system of a battery which efficiently cools a high voltage battery which is mounted in an electric vehicle or a hybrid vehicle so as to maintain battery performance by using a refrigeration cycle of an air-conditioning system, which is provided with an electric compressor, outside heat exchanger, inside heat exchanger, and a control device. A refrigerant path of the air-conditioning system for running refrigerant is provided with a branch path having a heat exchanger which bypasses the inside heat exchanger, a medium path connected to the heat exchanger runs another refrigerant for cooling the battery, control valves are provided which adjust the amounts of the refrigerant which flows to the refrigerant path and the branch path, and, when the control valves run the refrigerant to both the refrigerant path and the branch path, the control device increases the speed of the electric compressor.Type: ApplicationFiled: May 23, 2012Publication date: November 29, 2012Applicant: DENSO CORPORATIONInventors: Takayuki Kamada, Yoshinori Ichishi, Yasushi Kondo, Satoshi Izawa, Motohiro Yamaguchi
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Publication number: 20120291467Abstract: A refrigerant cycle device for a vehicle includes a compressor which compresses and discharges refrigerant, a discharge capacity control portion which controls a discharge capacity of the compressor. The refrigerant cycle device further includes a noise determination portion which determines whether an audible noise other than a refrigerant passing noise is in a low noise state, and/or a load determination portion which determines whether an air-conditioning thermal load is in a high load state. The discharge capacity control portion performs a gradual activation control in which the discharge capacity of the compressor is set to be lower than that determined in a normal control, when the noise determination portion determines that the audible noise is in the low noise state, and/or when the load determination portion determines that the air-conditioning thermal load is in the high load state, at an activation time of the compressor.Type: ApplicationFiled: May 16, 2012Publication date: November 22, 2012Applicant: DENSO CORPORATIONInventors: Minoru Sasaki, Takashi Yamanaka, Takeshi Wakisaka, Motohiro Yamaguchi, Yasuaki Sasaki, Ken Matsunaga
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Patent number: 6966197Abstract: When a dehumidifying and heating operation is set in an air conditioner, refrigerant is circulated from a compressor to the compressor through a first exterior heat exchanger, a decompression device, an interior heat exchanger, an another decompression device, an inner heat exchanger and a second exterior heat exchanger, in this order. Further, by controlling a throttle opening degree of the another decompression device, a refrigerant temperature in the interior heat exchanger can be set higher than that in the second exterior heat exchanger. Thus, even when the interior heat exchanger is controlled to a temperature to be not frosted, heat can be absorbed from outside air in the second exterior heat exchanger. Accordingly, when an outside air temperature is low, by setting the dehumidifying and heating operation, air to be blown into a compartment can be dehumidified while sufficiently increasing heating capacity.Type: GrantFiled: January 6, 2004Date of Patent: November 22, 2005Assignee: Denso CorporationInventors: Satoshi Itoh, Motohiro Yamaguchi
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Patent number: 6945074Abstract: In a vapor-compression refrigerant cycle system, a switching device is provided to switch one of a first mode where high-pressure refrigerant discharged from a compressor is directly introduced to an exterior heat exchanger and a second mode where the high-pressure refrigerant is directly introduced to an interior heat exchanger. When the second mode is set, the pressure of the high-pressure refrigerant is set higher than a predetermined pressure by a constant-pressure control valve. Accordingly, it can prevent heating capacity of the interior heat exchanger from being greatly changed even when thermal load of the vapor-compression refrigerant cycle system is changed, and heating capacity of the interior heat exchanger can be improved in the second mode.Type: GrantFiled: June 16, 2004Date of Patent: September 20, 2005Assignee: DENSO CorporationInventors: Yukimasa Sato, Motohiro Yamaguchi, Hiromi Ohta
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Patent number: 6868679Abstract: In a hot gas heating mode of an ejector cycle system, hot gas refrigerant discharged from a compressor is introduced to an interior heat exchanger while bypassing an exterior heat exchanger. The refrigerant discharged from the interior heat exchanger can flow into an ejector from at least an inlet of a nozzle of the ejector, and flows into the gas-liquid separator, in the heating mode. Alternatively, refrigerant discharged from the compressor can be supplied to the interior heat exchanger through a clearance between an outer wall of the nozzle and an inner wall of a nozzle housing portion, while bypassing the exterior heat exchanger in the heating mode. Here, the nozzle is disposed in the nozzle housing portion, and a part of pressurizing portion is defined by the nozzle housing portion. Thus, the heating mode can be readily performed in the ejector cycle system.Type: GrantFiled: November 25, 2003Date of Patent: March 22, 2005Assignee: DENSO CorporationInventors: Motohiro Yamaguchi, Hiromi Ohta, Yukimasa Sato
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Patent number: 6857286Abstract: A vapor-compression refrigerant cycle system includes a first evaporator in which refrigerant is evaporated, a second evaporator in which refrigerant is evaporated at a pressure lower than that in the first evaporator, and a switching device for switching between a first circulation where the refrigerant is circulated to the first evaporator and a second circulation where the refrigerant is circulated to the second evaporator. When the switching device switches to the second circulation from the first circulation, a refrigerant circulation into the second evaporator is stopped until the refrigerant pressure in the second evaporator becomes equal to or lower than a predetermined pressure. Therefore, the pressure in the second evaporator can be rapidly reduced. Further, when carbon dioxide is used as the refrigerant, the pressure in the second evaporator can be further rapidly reduced.Type: GrantFiled: December 15, 2003Date of Patent: February 22, 2005Assignee: DENSO CorporationInventors: Hiromi Ohta, Motohiro Yamaguchi, Keiichi Kitamura
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Publication number: 20040255602Abstract: In a vapor-compression refrigerant cycle system, a switching device is provided to switch one of a first mode where high-pressure refrigerant discharged from a compressor is directly introduced to an exterior heat exchanger and a second mode where the high-pressure refrigerant is directly introduced to an interior heat exchanger. When the second mode is set, the pressure of the high-pressure refrigerant is set higher than a predetermined pressure by a constant-pressure control valve. Accordingly, it can prevent heating capacity of the interior heat exchanger from being greatly changed even when thermal load of the vapor-compression refrigerant cycle system is changed, and heating capacity of the interior heat exchanger can be improved in the second mode.Type: ApplicationFiled: June 16, 2004Publication date: December 23, 2004Inventors: Yukimasa Sato, Motohiro Yamaguchi, Hiromi Ohta
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Patent number: 6829905Abstract: In an ejector cycle having an ejector, a throttle is provided inside a passenger compartment adjacent to an evaporator so that a length of a refrigerant passage between the throttle and the evaporator is shortened. Therefore, it can restrict a part of liquid refrigerant after being decompressed in the throttle from being evaporated in the refrigerant passage, before being introduced into the evaporator. In addition, a refrigerant inlet is provided at a lower header tank of an evaporator. Therefore, a gas-liquid refrigerant distribution difference due to the density difference between gas refrigerant and liquid refrigerant can be effectively restricted. Thus, refrigerant distributed into the plural tubes from the lower header tank can be made uniform, even if the refrigerant flow speed is low in the ejector cycle.Type: GrantFiled: September 19, 2003Date of Patent: December 14, 2004Assignee: Denso CorporationInventors: Hiromi Ohta, Masayuki Takeuchi, Motohiro Yamaguchi
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Patent number: 6807819Abstract: In a vapor compression refrigerant cycle for an air conditioner, as a refrigerant pressure at an operation starting time of a compressor increases, a starting target rotational speed of the compressor is reduced, and the operation of the compressor is started by the reduced starting target rotational speed. Accordingly, when the operation of the compressor is started, it can prevent the pressure of high-pressure side refrigerant from exceeding an allowable pressure of the compressor, thereby preventing a safety device of the compressor from operating. Therefore, even when the operation of the compressor is started in a high load state, a pressure abnormality is not generated in the refrigerant cycle, and operation of the air conditioner can be prevented from being stopped.Type: GrantFiled: July 1, 2003Date of Patent: October 26, 2004Assignee: Denso CorporationInventor: Motohiro Yamaguchi
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Publication number: 20040134217Abstract: When a dehumidifying and heating operation is set in an air conditioner, refrigerant is circulated from a compressor to the compressor through a first exterior heat exchanger, a decompression device, an interior heat exchanger, an another decompression device, an inner heat exchanger and a second exterior heat exchanger, in this order. Further, by controlling a throttle opening degree of the another decompression device, a refrigerant temperature in the interior heat exchanger can be set higher than that in the second exterior heat exchanger. Thus, even when the interior heat exchanger is controlled to a temperature to be not frosted, heat can be absorbed from outside air in the second exterior heat exchanger. Accordingly, when an outside air temperature is low, by setting the dehumidifying and heating operation, air to be blown into a compartment can be dehumidified while sufficiently increasing heating capacity.Type: ApplicationFiled: January 6, 2004Publication date: July 15, 2004Inventors: Satoshi Itoh, Motohiro Yamaguchi
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Publication number: 20040123624Abstract: A vapor-compression refrigerant cycle system includes a first evaporator in which refrigerant is evaporated, a second evaporator in which refrigerant is evaporated at a pressure lower than that in the first evaporator, and a switching device for switching between a first circulation where the refrigerant is circulated to the first evaporator and a second circulation where the refrigerant is circulated to the second evaporator. When the switching device switches to the second circulation from the first circulation, a refrigerant circulation into the second evaporator is stopped until the refrigerant pressure in the second evaporator becomes equal to or lower than a predetermined pressure. Therefore, the pressure in the second evaporator can be rapidly reduced. Further, when carbon dioxide is used as the refrigerant, the pressure in the second evaporator can be further rapidly reduced.Type: ApplicationFiled: December 15, 2003Publication date: July 1, 2004Inventors: Hiromi Ohta, Motohiro Yamaguchi, Keiichi Kitamura
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Publication number: 20040103685Abstract: In a hot gas heating mode of an ejector cycle system, hot gas refrigerant discharged from a compressor is introduced to an interior heat exchanger while bypassing an exterior heat exchanger. The refrigerant discharged from the interior heat exchanger can flow into an ejector from at least an inlet of a nozzle of the ejector, and flows into the gas-liquid separator, in the heating mode. Alternatively, refrigerant discharged from the compressor can be supplied to the interior heat exchanger through a clearance between an outer wall of the nozzle and an inner wall of a nozzle housing portion, while bypassing the exterior heat exchanger in the heating mode. Here, the nozzle is disposed in the nozzle housing portion, and a part of pressurizing portion is defined by the nozzle housing portion. Thus, the heating mode can be readily performed in the ejector cycle system.Type: ApplicationFiled: November 25, 2003Publication date: June 3, 2004Inventors: Motohiro Yamaguchi, Hiromi Ohta, Yukimasa Sato
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Patent number: 6725679Abstract: In a vehicle air conditioner with a heat pump cycle having an interior heat exchanger and an exterior heat exchanger, when a frosting on a surface of the exterior heat exchanger is determined and when a temperature of hot water supplied to a heater core is equal to or higher than a predetermined temperature, the exterior heat exchanger is defrosted in a defrosting operation. Accordingly, the defrosting operation can be performed while a sufficient heating can be obtained.Type: GrantFiled: September 20, 2001Date of Patent: April 27, 2004Assignee: Denso CorporationInventors: Satoshi Itoh, Motohiro Yamaguchi, Yoshitaka Tomatsu, Toshio Hirata, Yasushi Yamanaka, Keita Honda, Kunio Iritani
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Patent number: 6715540Abstract: The air heating capability of an indoor heat exchanger is limited to set the temperature of the indoor heat exchanger to a first predetermined temperature Tel or lower during heating. Thereby, fogging is prevented through re-evaporation of the condensed water in the indoor heat exchanger during heating within an air-conditioning apparatus with a hot water heater core using hot water as the heat source and the heating circuit.Type: GrantFiled: April 27, 2001Date of Patent: April 6, 2004Assignee: Denso CorporationInventors: Ryo Kobayashi, Yasushi Yamanaka, Yoshitaka Tomatsu, Satoshi Itoh, Motohiro Yamaguchi, Satoshi Izawa, Yoshiaki Takano, Toshitaka Shimizu
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Publication number: 20040055327Abstract: In an ejector cycle having an ejector, a throttle is provided inside a passenger compartment adjacent to an evaporator so that a length of a refrigerant passage between the throttle and the evaporator is shortened. Therefore, it can restrict a part of liquid refrigerant after being decompressed in the throttle from being evaporated in the refrigerant passage, before being introduced into the evaporator. In addition, a refrigerant inlet is provided at a lower header tank of an evaporator. Therefore, a gas-liquid refrigerant distribution difference due to the density difference between gas refrigerant and liquid refrigerant can be effectively restricted. Thus, refrigerant distributed into the plural tubes from the lower header tank can be made uniform, even if the refrigerant flow speed is low in the ejector cycle.Type: ApplicationFiled: September 19, 2003Publication date: March 25, 2004Inventors: Hiromi Ohta, Masayuki Takeuchi, Motohiro Yamaguchi