Nippondenso Co., Ltd.

Toyota Jidosha Kogyo Kabushiki Kaisha

B Nippondenso Co., Ltd.

Akiro Yoshimi

Fumio Ootsuka

Masashi Takagi

Yasuhumi Kojima

Takeo Matsushima

Michihiko Kamiya

Akio Takemi

Masao Sakurai

Takayoshi Kawai

Kazutoshi Nishizawa

Yasuyuki Nishi

Akio Matsuoka

Atsunori Saito

Masao Nishimura

Mitsutoshi Moriya

Norio Maehara

Morimasa Ninomiya

Takeshi Kuwajima

Kazuyoshi Suzuki

A refrigeration system comprises a refrigeration cycle including a compressor of a variable capacity type for compressing a refrigerant and an evaporator for evaporating the compressed refrigerant. A driving source is connected to the compressor through a clutch movable between an engaged position and a disengaged position. A first detector detects pressure of the refrigerant evaporated by the evaporator to generate a signal. A second detector detects temperature relating to a cooling condition of the evaporator to generate a signal. A capacity control unit controls a discharge capacity of the compressor so as to cause the pressure detected by the first detector to approach an aimed pressure. A clutch control unit is operative in response to the signals from the respective first and second detectors to judge a condition of frosting on the evaporator for controlling the clutch for movement between the engaged and disengaged positions and to judge an insufficiency in quantity of the refrigerant in the refrigeration cycle for controlling the clutch for movement to the disengaged position.

Temperature and pressure monitored refrigeration system

An automotive air conditioning system has refrigeration devices, heating devices and a single chip microcomputer. The refrigeration devices include a variable displacement refrigeration compressor drivingly connectable by an electromagnetic clutch to an automotive engine and a refrigerant evaporator disposed in an air duct, through which air is caused to flow by a blower. The heating devices include a heater core disposed downstream of the refrigerant evaporator, through which heated air is caused to flow, and an air mixing damper which regulates the quantity of air to be introduced into the heater core. A condition relating to the air conditioning operation such as the temperature of the vehicle is detected by a sensor. The microcomputer receives the signals from the sensor, calculates a required injection temperature, compares the required injection temperature and a preset standard temperature, a lower standard temperature and a higher standard temperature and produces operating signals. The operating signals manage the connection of the electromagnetic clutch, vary the displacement of the refrigeration compressor, regulate the degree of opening of the air mixing damper and control the rotating velocity of the blower.

Automotive air conditioning system with automatic control of

Apparatus for controlling an automotive air conditioner comprises first and second air distribution passageways in which blower fans are provided to direct air streams respectively therethrough to first and second areas of a passenger compartment. First and second evaporators located in the first and second passageways respectively are supplied with working fluid to transfer thermal energy from the first and second air streams to the supplied working fluid. A control unit is responsive to the temperatures of the first and second areas and temperature settings for estimating thermal energies of the first and second air streams to be delivered from the passageways and derives first and second control signals from the estimated thermal energies to control actuators which individually regulate the flow rates of the working fluid supplied to the first and second evaporators.

Apparatus for controlling automotive air conditioners

An apparatus for controlling the operation of an automobile air conditioner comprises mode switches which permit selection between a manual control mode and an automatic control mode for the control of the flow rate of the conditioned air, and a digital computer incorporating therein a memory which memorizes the selected control mode in accordance with signals received from the mode switches. The digital computer is constituted to give instructions to control members of the air conditioner for controlling in accordance with the values stored in the memory, and to set in the memory a value representing the automatic control mode so as to operate the air conditioner in the automatic control mode when a main switch of the air conditioner is turned on.

Apparatus for controlling operation of automobile air conditioner

An apparatus for controlling an air conditioner having a refrigeration cycle including an evaporator disposed in an air passage for supplying air to an area to be air-conditioned and a compressor having a mechanism for varying a volume of discharge from the compressor, comprises signal generator responsive to a humidity in the area to be air-conditioned for producing a signal indicative of the humidity; and means responsive to the signal from the signal generator for actuating the mechanism for varying the volume of discharge from the compressor.

Air conditioner control apparatus

A vehicle air conditioner control apparatus for supplying into the passenger compartment of a vehicle a flow of air which is temperature controlled in accordance with air conditioner control conditions, automatically controls an air change-over damper in response to a manual setting device for selectively commanding the induction of outside air, the induction of inside air and the induction of outside and inside air into an air duct and in response to a signal indicative of an absolute temperature of air inducted into the air duct, which is computed and generated in accordance with the outputs of a plurality of sensors.

Air induction control system for vehicle air conditioners

A multizone air-conditioning system for a motor vehicle includes a single air-conditioning unit and an air distribution conduit. The air distribution conduit has multiple conduit portions with outlets respectively open to horizontally spaced apart zones of the passenger compartment. Each outlet has a switching damper for diverting a variable amount of conditioned airflow in response to a feedback control signal to vertically spaced apart zones of the compartment to automatically operate the system in one of different air-conditioned modes. The control signal is derived from temperature measurement data and a reference setting establised with respect to each horizontally spaced apart zone. The air-conditioning unit includes air mixing dampers respectively located in the conduit portions and a heating radiator having half portions thereof located respectively downstream of the mixing dampers. A correction signal is obtained from the result of comparison between the settings of air mixing dampers to control the setting of each switching damper to minimize the effect of thermal interferences which might exist between the conduit portions.

Multizone air-conditioning system for motor vehicles

An automotive air conditioner device includes an air duct, a blower motor for producing an air stream to be supplied to an automotive passenger compartment through the air duct, a heat exchanger having a heater and a cooling device, and an electronic control device. The electronic control device includes various sensors, a microcomputer for executing computation processings of output signals from the various sensors in accordance with a predetermined program and producing a first and a second control signal, a drive circuit responsive to the first control signal for changing a temperature adjusting value of the heat exchanger and another drive circuit responsive to the second control signal for changing the cooling power of the cooling device, thereby to control the air temperature within the automotive passenger compartment at a desired value.

Automotive air conditioner having coating power control device

An air-conditioner control system for vehicles which is responsive to a condition in the compartment of a vehicle to move an air-flow controlling damper in an air duct. When the supply mode of conditioned air is a heater supply mode and when it is detected that the level of insolation in the vehicle compartment is higher than a predetermined level, the control system alters the supply mode of conditioned air to a bi-level supply mode.

Air-conditioner control system for vehicles

In control of an air conditioner, the rate of change of the actual temperature of air in a compartment is detected to detect a deviation between the actual temperature of air and a desired temperature of air. When the detected deviation is larger than a predetermined value, another deviation is also detected to adjust the temperature of air flow supplied from the air conditioner and to eliminate undesired temperature deviation caused by fluctuation of the heat load in the compartment.

Control method and apparatus for air conditioners

A temperature control method and apparatus responsive to various control conditions to determine the desired amount of temperature control to cause the compartment temperature of a vehicle to approach a desired value. They comprise a first step of producing a first control condition in response to the amount of light incident to the vehicle compartment and a second step of producing a second control condition in response to the amount of heat radiation incident to the vehicle compartment, and a third step whereby the second control condition is adjusted by the first control condition so as to compensate the amount of temperature control in accordance with the adjusted control condition.

Growing community of inventors

Kariya, Japan

Akiro Yoshimi