Patents by Inventor Mitsuyo Oomura

Mitsuyo Oomura 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).

  • Patent number: 9250005
    Abstract: An air conditioner for a vehicle includes a vapor compression refrigeration cycle switchable between a heat pump cycle and a cooler cycle, a heat core configured to heat air to be blown into a vehicle compartment by using coolant of an engine of the vehicle as a heat source, and a controller configured to control operation of the vapor compression refrigeration cycle. The controller controls the vapor compression refrigeration cycle to be operated as the cooler cycle so as to perform a defrosting control of the outdoor heat exchanger, and outputs an operation request signal to the engine, when the controller determines that the outdoor heat exchanger is frosted.
    Type: Grant
    Filed: November 7, 2014
    Date of Patent: February 2, 2016
    Assignee: DENSO CORPORATION
    Inventors: Mitsuyo Oomura, Hiroyuki Hayashi, Yukihiko Takeda, Yoshinori Ichishi
  • Publication number: 20150059375
    Abstract: An air conditioner for a vehicle includes a vapor compression refrigeration cycle switchable between a heat pump cycle and a cooler cycle, a heat core configured to heat air to be blown into a vehicle compartment by using coolant of an engine of the vehicle as a heat source, and a controller configured to control operation of the vapor compression refrigeration cycle. The controller controls the vapor compression refrigeration cycle to be operated as the cooler cycle so as to perform a defrosting control of the outdoor heat exchanger, and outputs an operation request signal to the engine, when the controller determines that the outdoor heat exchanger is frosted.
    Type: Application
    Filed: November 7, 2014
    Publication date: March 5, 2015
    Inventors: Mitsuyo Oomura, Hiroyuki Hayashi, Yukihiko Takeda, Yoshinori Ichishi
  • Patent number: 8966928
    Abstract: An air conditioner for a vehicle includes a vapor compression refrigeration cycle switchable between a heat pump cycle and a cooler cycle, a heat core configured to heat air to be blown into a vehicle compartment by using coolant of an engine of the vehicle as a heat source, and a controller configured to control operation of the vapor compression refrigeration cycle. The controller controls the vapor compression refrigeration cycle to be operated as the cooler cycle so as to perform a defrosting control of the outdoor heat exchanger, and outputs an operation request signal to the engine, when the controller determines that the outdoor heat exchanger is frosted.
    Type: Grant
    Filed: July 7, 2010
    Date of Patent: March 3, 2015
    Assignee: Denso Corporation
    Inventors: Mitsuyo Oomura, Hiroyuki Hayashi, Yukihiko Takeda, Yoshinori Ichishi
  • Patent number: 8047274
    Abstract: An air conditioner for a vehicle includes a main heater for heating air in a vehicle compartment using coolant of an engine of the vehicle as a heat source, and an auxiliary heater for heating air in the vehicle compartment using a heat source other than exhaust heat of the engine. In the air conditioner, a requirement signal for requiring startup of the engine is output when a temperature of the coolant of the engine is determined to be lower than a threshold, and the threshold is adjusted based on an operating state of the auxiliary heater such that as an amount of heat generated by the auxiliary heater increases, the threshold decreases. Accordingly, as the heating capacity of the auxiliary heater is increased, the startup of the engine becomes more difficult.
    Type: Grant
    Filed: January 15, 2008
    Date of Patent: November 1, 2011
    Assignee: Denso Corporation
    Inventor: Mitsuyo Oomura
  • Patent number: 7997331
    Abstract: An air-conditioning system allows adjustment of the vented air temperature of a rear seat evaporator. An electronic control system judges whether the surface of the rear seat evaporator is frosting up when 1) a target blowing rate of the rear seat blower is lower than a predetermined value, 2) a detected temperature of evaporator vented air is lower than a specified temperature TEa, and 3) a detected temperature of the outside air is lower than a specified temperature TAMa. A target temperature TEO is raised at this time, so that an electric motor of an electric compressor is stopped and refrigerant no longer flows into the rear seat evaporator. The surface temperature of the rear seat evaporator rises so that the rear seat evaporator can be defrosted.
    Type: Grant
    Filed: March 8, 2007
    Date of Patent: August 16, 2011
    Assignee: Denso Corporation
    Inventors: Mitsuyo Oomura, Takeshi Wakisaka, Katsutoshi Hirose
  • Publication number: 20110016896
    Abstract: An air conditioner for a vehicle includes a vapor compression refrigeration cycle switchable between a heat pump cycle and a cooler cycle, a heat core configured to heat air to be blown into a vehicle compartment by using coolant of an engine of the vehicle as a heat source, and a controller configured to control operation of the vapor compression refrigeration cycle. The controller controls the vapor compression refrigeration cycle to be operated as the cooler cycle so as to perform a defrosting control of the outdoor heat exchanger, and outputs an operation request signal to the engine, when the controller determines that the outdoor heat exchanger is frosted.
    Type: Application
    Filed: July 7, 2010
    Publication date: January 27, 2011
    Applicant: DENSO CORPORATION
    Inventors: Mitsuyo Oomura, Hiroyuki Hayashi, Yukihiko Takeda, Yoshinori Ichishi
  • Publication number: 20100326127
    Abstract: An air conditioner for a vehicle includes a vapor compression refrigeration cycle configured to have a heat pump cycle for heating air to be blown into an interior of a vehicle compartment, and a heating member for heating the air using a coolant of an internal combustion engine of the vehicle as a heat source. In the air conditioner, an operation request signal is output by an air conditioning controller to the internal combustion engine when an outside air temperature is lower than a predetermined threshold.
    Type: Application
    Filed: June 25, 2010
    Publication date: December 30, 2010
    Applicant: DENSO CORPORATION
    Inventors: Mitsuyo Oomura, Hiroyuki Hayashi, Takuya Tanihata, Yoshinori Ichishi
  • Publication number: 20090241570
    Abstract: In a refrigerant cycle system, a compression mechanism of an electric compressor sucks and compresses refrigerant, and an electric motor that drives the compression mechanism is cooled by the refrigerant. A variable throttle mechanism decompresses the refrigerant discharged from the electric compressor. A motor temperature detector detects a temperature of the electric motor. A motor protection determiner determines whether the temperature of the electric motor detected by the motor temperature detector is equal to or higher than a criterion value. A motor protection controller controls the variable throttle mechanism so that an opening degree of the variable throttle mechanism does not decrease when the motor protection determiner determines that the temperature of the electric motor is equal to or higher than the criterion value.
    Type: Application
    Filed: March 17, 2009
    Publication date: October 1, 2009
    Applicant: DENSO CORPORATION
    Inventors: Nobukazu Kuribayashi, Yasutaka Kuroda, Mitsuyo Oomura, Ken Matsunaga, Satoshi Itoh
  • Publication number: 20080168766
    Abstract: An air conditioner for a vehicle includes a main heater for heating air in a vehicle compartment using coolant of an engine of the vehicle as a heat source, and an auxiliary heater for heating air in the vehicle compartment using a heat source other than exhaust heat of the engine. In the air conditioner, a requirement signal for requiring startup of the engine is output when a temperature of the coolant of the engine is determined to be lower than a threshold, and the threshold is adjusted based on an operating state of the auxiliary heater such that as an amount of heat generated by the auxiliary heater increases, the threshold decreases. Accordingly, as the heating capacity of the auxiliary heater is increased, the startup of the engine becomes more difficult.
    Type: Application
    Filed: January 15, 2008
    Publication date: July 17, 2008
    Applicant: DENSO Corporation
    Inventor: Mitsuyo Oomura
  • Patent number: 7398653
    Abstract: An inverter 6 that drives an electric motor 4 of the electric compressor 3 operates in a protection-against-overheat mode, in which the electric motor is driven at a rotational speed for protection against heat different from a rotational speed specifying value from an air conditioning control unit 20, in order to ensure the flow rate of the refrigerant and cool the inverter itself when the temperature detected by an inverter temperature sensor 22g exceeds a predetermined value. At this time, if the refrigerant pressure increases or the evaporator discharge temperature falls, the air conditioning control unit stops the protection-against-overheat mode operation of the inverter and directs the inverter to forcedly stop the electric motor. Due to this, an excessive increase in the refrigerant pressure and evaporator freezeing can be prevented, and thus the function of the refrigerating cycle can be protected.
    Type: Grant
    Filed: March 22, 2005
    Date of Patent: July 15, 2008
    Assignee: Denso Corporation
    Inventors: Mitsuyo Oomura, Toshinobu Homan
  • Patent number: 7325595
    Abstract: In a hybrid vehicle air conditioning system in which coolant is supplied to a heater core from a vehicle running engine, for heating, a demand of the operation of the vehicle running engine is controlled to obtain respective set coolant temperatures TWS2 for target air-outlet temperature TAO of air sent out into a passenger compartment during a bilevel mode operation and TWS1 for the target air-outlet temperature TAO during a foot mode operation by setting the set coolant temperature TWS2 higher than the set coolant temperature TWS1.
    Type: Grant
    Filed: August 16, 2004
    Date of Patent: February 5, 2008
    Assignee: DENSO Corporation
    Inventors: Toshinobu Homan, Mitsuyo Oomura, Makoto Yoshida
  • Publication number: 20070209789
    Abstract: An air-conditioning system preventing the vented air temperature of a rear seat evaporator from not being able to be adjusted, wherein an electronic control system judges that the surface of the rear seat evaporator is frosting up when a target blowing rate of the rear seat blower is lower than a predetermined value, a detection temperature of an evaporator vented air temperature sensor is lower than TEa, and a detection temperature of the outside air temperature sensor is lower than TAMa; TEO is raised at this time, so an electric motor of an electric compressor is stopped; refrigerant no longer flows into the rear seat evaporator for this reason and the surface of the rear seat evaporator rises in temperature, so the rear seat evaporator can be defrosted; and even if the surface of the rear seat evaporator frosts, the rear seat evaporator 8 can be defrosted, so the vented air temperature of the rear seat evaporator can be prevented from not being able to be adjusted.
    Type: Application
    Filed: March 8, 2007
    Publication date: September 13, 2007
    Applicant: DENSO Corporation
    Inventors: Mitsuyo Oomura, Takeshi Wakisaka, Katsutoshi Hirose
  • Patent number: 7201010
    Abstract: In a compressor control system for a vehicle air conditioner, a hybrid ECU of the vehicle controls a rotation speed of a compressor electric motor. In this case, an output circuit, which outputs a driving signal for driving the compressor electric motor, only needs to be newly provided in the hybrid ECU when a hybrid vehicle or an electric vehicle is manufactured based on an engine vehicle. Therefore, a high cost is not caused even when the output circuit is provided in the hybrid ECU which should be newly designed and manufactured. In addition, because the output circuit does not need to be provided in an air-conditioning ECU which is an existing component of the engine vehicle, the air-conditioning ECU in the engine vehicle can be directly applied to that in the hybrid vehicle without a substantial hardware change. Therefore, design cost can be reduced.
    Type: Grant
    Filed: February 25, 2004
    Date of Patent: April 10, 2007
    Assignee: Denso Corporation
    Inventors: Toshinobu Homan, Yuji Takeo, Mitsuyo Oomura
  • Patent number: 7201219
    Abstract: An air-conditioner is operated under one mode selected from among three modes, i.e., a cooling mode, a heating mode and an air-mixing mode. Conditioned air temperature is controlled by changing a cooling ability in the cooling mode, a heating ability in the heating mode, and a position of an air-mixing door in the air-mixing mode. When the operating mode is switched to the cooling mode or to the heating mode from another mode, the position of the air-mixing door is gradually changed to prevent an abrupt temperature drop or rise until a difference between a target temperature and an actual temperature becomes smaller than a predetermined value.
    Type: Grant
    Filed: October 9, 2003
    Date of Patent: April 10, 2007
    Assignee: DENSO Corporation
    Inventors: Hisashi Ieda, Mitsuyo Oomura
  • Patent number: 7174733
    Abstract: A vehicular air-conditioner wherein when a detected temperature of an inverter temperature sensor (22g) exceeds a predetermined value, an inverter (6) driving an electric motor (4) of an electric compressor (3) operates in an overheat protection mode for driving the electric motor by a heat protection speed different from the speed command value from the air-conditioning controller (20), secures the refrigerant flow rate, and cools itself. At this time, when a condenser fan (8) or vehicle compartment blower (14) is stopped by passenger operation or air-conditioning control, it is operated to promote the heat exchange at the heat exchangers, whereby it becomes possible to prevent an increase in the refrigerant pressure in the condenser (7) and prevent frost at the evaporator (11) and possible to protect against failure of function of the refrigeration cycle (2).
    Type: Grant
    Filed: March 23, 2005
    Date of Patent: February 13, 2007
    Assignee: Denso Corporation
    Inventors: Mitsuyo Oomura, Toshinobu Homan
  • Patent number: 7096935
    Abstract: A power supply control for a vehicle includes air-conditioning electric devices and other electric devices. In the power supply control operation, current target power that is necessary for the specific electric device is calculated based on a precedent target power that was calculated the last time the specific electric device was used. An allowed power that is allowed to be supplied to the specific electric device is calculated based on the total power demand of the vehicle. The power to be supplied to the specific device is limited to the allowed power if the current target power is larger than the allowed power and the precedent target power is replaced with the allowed power if the actual power supplied to the specific electric device is limited to the allowed power.
    Type: Grant
    Filed: May 21, 2003
    Date of Patent: August 29, 2006
    Assignee: DENSO Corporation
    Inventors: Hisashi Ieda, Mitsuyo Oomura
  • Patent number: 7013659
    Abstract: In a battery cooling system that cools a battery by using conditioned air (inside air of a passenger compartment) of a vehicle air conditioner, a battery control unit controls a battery blower to increase an air amount supplied to the battery when a predetermined condition is satisfied. In contrast, an air-conditioning control unit decreases a compression capacity of a compression device after an air amount supplied to the battery is increased to a predetermined amount by the battery control unit. For example, the air-conditioning control unit decreases the compression capacity of the compression device after a predetermined time passes after the air amount supplied to the battery is increased to the predetermined amount. Accordingly, the temperature inside the passenger compartment and the compression device can be stably controlled.
    Type: Grant
    Filed: August 5, 2004
    Date of Patent: March 21, 2006
    Assignee: DENSO Corporation
    Inventors: Makoto Yoshida, Mitsuyo Oomura, Toshinobu Homan, Keita Honda, Hiroshi Kishita
  • Patent number: 6978629
    Abstract: In a vehicle air conditioner, a controller calculates a first target post-evaporator temperature for defogging a windshield based on a detection humidity of a humidity sensor, and calculates a second target post-evaporator temperature for defogging the windshield regardless of the detection humidity of the humidity sensor. Then, the controller determines a smaller one between the first and second target post-evaporator temperatures, as a target post-evaporator temperature. Accordingly, even when the humidity sensor detects a humidity lower than an actual humidity of a passenger compartment when a blower operates by a low air-blowing amount, a windshield is prevented from fogging.
    Type: Grant
    Filed: August 26, 2004
    Date of Patent: December 27, 2005
    Assignee: DENSO Corporation
    Inventors: Makoto Yoshida, Mitsuyo Oomura, Toshinobu Homan
  • Patent number: 6955060
    Abstract: In an air conditioner, a target compressor rotation speed is determined based on a target air temperature, which represents an air conditioning load, when an electric compressor is started from a stop state. Thus, an evaporator air temperature can be approximated to a target evaporator air temperature, more quickly as compared with a control method where an incremental rotation speed is added to a present rotation speed of the electric compressor, that is, 0 rpm. Accordingly, a large cooling capacity can be obtained for a short time period. Thus, an air temperature in a compartment can be quickly reduced to a comfortable temperature, when the air conditioner is started, for example.
    Type: Grant
    Filed: March 25, 2004
    Date of Patent: October 18, 2005
    Assignee: Denso Corporation
    Inventors: Toshinobu Homan, Mitsuyo Oomura, Makoto Yoshida
  • Publication number: 20050210900
    Abstract: An inverter 6 that drives an electric motor 4 of the electric compressor 3 operates in a protection-against-overheat mode, in which the electric motor is driven at a rotational speed for protection against heat different from a rotational speed specifying value from an air conditioning control unit 20, in order to ensure the flow rate of the refrigerant and cool the inverter itself when the temperature detected by an inverter temperature sensor 22g exceeds a predetermined value. At this time, if the refrigerant pressure increases or the evaporator discharge temperature falls, the air conditioning control unit stops the protection-against-overheat mode operation of the inverter and directs the inverter to forcedly stop the electric motor. Due to this, an excessive increase in the refrigerant pressure and evaporator freezeing can be prevented, and thus the function of the refrigerating cycle can be protected.
    Type: Application
    Filed: March 22, 2005
    Publication date: September 29, 2005
    Applicant: DENSO Corporation
    Inventors: Mitsuyo Oomura, Toshinobu Homan