Nissan Motor Company Limited

Zexel Gmbh

Takayoshi Matsuoka

Junichiro Hara

Takafumi Uehara

Yutaka Uematsu

Toshio Ohashi

Fujio Arai

Kazuo Fujii

Kenichiro Minami

Tzu-Hsiang Yen

Yasuhiro Masumura

Isao Takahashi

A vehicle air-conditioning system has an intake door that switches between an inside air recirculation mode to take in air from an inside air introduction port and an outside air introduction mode to take in air from an outside air introduction port, a blower that blows the air introduced through any of the inside air introduction port and the outside air introduction port toward inside of a vehicle cabin, a heater that heats the air blown by the blower, and a controller that activates the heater when there is a request for heating the inside of the vehicle cabin, controls air conditioning such that an environment inside the vehicle cabin becomes a desired environment by set estimated time of departure.

Vehicle air-conditioning system and vehicle air-conditioning method

A vehicle heating and air conditioning system basically includes an interior/exterior air introducing structure, a heating device, a driving end time acquiring section and an interior/exterior air switching control section. The interior/exterior air introducing structure switches the flow of cabin intake air between an interior air recirculation mode and an exterior air introducing mode. The heating device heats the cabin intake air being introduced by the interior/exterior air introducing structure. The driving end time acquiring section estimates a driving end time corresponding to a point in time at which driving of a vehicle is predicted to end. The interior/exterior air switching control section switches the interior/exterior air introducing structure from the exterior air introducing mode to the interior air recirculation mode during a period of time from a prescribed point in time until the driving end time to restrict windshield fogging while in the interior air recirculation mode.

Vehicle heating and air conditioning system

A vehicle air conditioning system includes an electric powered refrigerant compressing device, an evaporator, an electric heater, an air temperature determining component, a cabin interior temperature controlling component, an upper limit electric power setting component, and an electric power distribution controller. The evaporator receives refrigerant from the compressing device. The heater is downstream of the evaporator in an air passageway. The determining component determines a first air temperature upstream of the evaporator and a second air temperature between the evaporator and the heater. The controlling component sets a vehicle interior discharge air temperature at a position downstream of the heater to a target temperature. The power setting component sets an upper limit for power supplied to the compressing device and the heater. The power distribution controller distributes the upper limit electric power to the compressing device and the heater based on a ratio of upstream and downstream temperature differences.

Vehicle air conditioning system

A vehicle air-conditioning system with a motor driven compressor is control to suppress overheating of the electronic devices inside the compressor inverter and to suppress overheating of the battery. If the compressor intake refrigerant temperature is high when the compressor starts up, the maximum allowable rotational speed of the compressor is limited and the airflow rate of the blower fan is reduced by lowering the voltage of the blower fan motor. As a result, overheating of the electronic devices inside the compressor inverter is suppressed. Also, if the compressor intake refrigerant temperature is high when the compressor starts up, the load on the battery is lightened and overheating of the battery is suppressed by switching the source of the electric power supplied to the compressor from the battery to the motor generator.

Vehicle air-conditioning system

A vehicular air conditioner is of a heat pump type including a vapor compression refrigeration cycle. The refrigeration cycle comprises a compressor of a type which changes a changing speed of a correlation amount of a refrigerant discharge amount according to whether an operating condition of the air conditioner is manually changed by a vehicle passenger or not. Therefore, the vehicle passenger can recognize that an discharging capacity of the compressor is changed according to the passenger's operation.

Heat pump type air conditioner for vehicle

In order to provide a control apparatus for an air conditioning system for an electric vehicle which achieves smooth switching of operating modes, a decision is made as to whether or not the operating mode set by a means for air conditioning mode setting has been maintained for a specific length of time and also, a decision is made by a means for compressor rotation rate decision making as to whether or not the actual rotation rate of the compressor is at the minimum rotation rate. With this, if the operating mode set by the means for air conditioning mode setting has not been maintained for the specific length of time, or, if the operating mode has been maintained for the specific length of time but the actual rotation rate of the compressor is not at the minimum, the rotation rate of the compressor is set at the minimum rate by a means for shift mode setting so that the operating mode is switched only when the operating mode set by the means for air conditioning mode setting has been maintained for the specific length of time and the actual rotation rate of the compressor is at the minimum rate, and the compressor is controlled based upon the air conditioning level set by the means for air conditioning mode setting.

Control apparatus for an air conditioning system for an electric vehicle

An air conditioner for a vehicle having a compressor, an outer heat exchanger, a heat-radiating inner heat exchanger an expansion valve, a heat-absorbing inner heat exchanger which are connected therebetween. A connecting condition of these elements is changed into one of a cooling, a first heating and a second heating, by controlling a refrigerant passage switching device. During the cooling, refrigerant in the air conditioner is circulated in the order of at least the outer heat exchanger, the expansion valve, the heat-absorbing inner heat exchanger and the compressor. During the first heating the refrigerant is circulated in the order of the heat-radiating inner heat exchanger, the expansion valve, the heat-absorbing inner heat exchanger and the compressor while bypassing the outer heat exchanger. During the second heating, the refrigerant is circulated in the order of the heat-radiating inner heat exchanger, the expansion valve, at least the outer heat exchanger and the compressor. Therefore, it becomes possible to implement a heating operation in a wide-range from an intensely cold condition to a slightly cool condition while saving an energy consumption.

Air conditioner for vehicle

A heat pump type air conditioner for a vehicle has a compressor to which a condenser and a inner heat exchanger are connected through a first switching valve. The condenser is connected at its refrigerant outlet to the inner heat exchanger through a second switching valve. An refrigerant outlet of the inner heat exchanger is connected to an evaporator through an expansion valve. A refrigerant outlet of the evaporator is connected to the compressor. The first switching valve functions to change the operation or the air conditioner between heating and cooling. The first and second switching valves function to allow to flow the refrigerant into the outer heat exchanger even if in heating, according to the thermal condition of the outer heat exchanger. Therefore, it becomes possible to stably implement heating without causing a stagnation of the refrigerant in the outer condenser even under a cold thermal condition.

A heat pump type air conditioner for an automotive vehicle has a compressor to which an outer heat exchanger and a first inner heat exchanger are connected through a three-way valve. The outer heat exchanger is connected at its refrigerant outlet to the first inner heat exchanger through one-way valve. The refrigerant outlet of the first inner heat exchanger is connected to a second inner heat exchanger through an expansion valve. The refrigerant outlet of the second inner heat exchanger is connected to the compressor. The second and first inner heat exchangers are disposed in turn downstream of a blower for generating an air flow for air-conditioning a passenger compartment of the vehicle. During a cooling drive the three-way valve is set to lead the refrigerant from the compressor to the outer heat exchanger. During a heating drive the three-way valve is set to direct the refrigerant from the compressor to the first inner heat exchanger while bypassing the outer heat exchanger. As a result, the air-conditioning capacity of the air conditioner is improved without changing the direction of refrigerant flow to the cooling and heating drive.

Heat pump type air conditioner for automotive vehicle

A heat pump type air conditioner for an automotive vehicle is provided with a compressor to which an outer condenser and a inner condenser are connected through a three-way valve. The inner condenser is connected to an inner evaporator through an expansion valve. The air conditioner further includes a control unit which defines a relationship among a heating property, a physical amount according to which workload of the compressor is varied, and thermal operating condition of at least one of the inner evaporator and the inner condenser. The control unit determines the physical amount at a value from the relationship for the heating property and the detected thermal operation condition by sensors, and controls the compressor according to the determined physical amount.

An air conditioner for a vehicle having a compressor, an outer heat exchanger, a heat-radiating inner heat exchanger an expansion valve, a heat-absorbing inner heat exchanger which are connected thereamong. A connecting condition of these elements is changed into one of a cooling, a heating and a weak heating, by controlling a refrigerant passage switching device. During the cooling, refrigerant in the air conditioner is circulated in the order of at least the outer heat exchanger, the expansion valve, the heat-absorbing inner heat exchanger and the compressor. During the heating the refrigerant is circulated in the order of the heat-radiating inner heat exchanger, the expansion valve, the heat-absorbing inner heat exchanger and the compressor while bypassing the outer heat exchanger. During the weak heating, the refrigerant is circulated in the order of the heat-radiating inner heat exchanger, the expansion valve, at least the outer heat exchanger and the compressor. Therefore, it becomes possible to implement a heating operation in a wide-range from an intensely cold condition to a slightly cool condition while saving an energy consumption.

A heat pump type air conditioner for an automotive vehicle has a compressor whose outlet is connected to a condenser and a heat-radiating inner heat exchanger through a three-way valve. The heat-radiating inner heat exchanger is connected to an evaporator through an expansion valve. The evaporator is connected to an inlet of the compressor. During a cooling operation, the three-way valve is set to lead the refrigerant from the compressor to the condenser. During a heating operation, the three-way valve is set to lead the refrigerant from the compressor to the heat-radiating inner heat exchanger while bypassing the condenser. A control unit controls such that a cooling efficiency of the condenser is lowered for a predetermined time when the compressor is started. Therefore, the heating operation is securely implemented, and a start-up period in starting is shortened. Furthermore, the freezing of the condenser is avoided.

A heat pump type air conditioner for an automotive vehicle has a compressor to which an outer heat exchanger and a heat-radiating inner heat exchanger are connected through a three-way valve. The heat-radiating inner heat exchanger is connected to a heat-absorbing inner heat exchanger through an expansion valve. The heat-absorbing inner heat exchanger is connected to the compressor. During a cooling operation the three-way valve is set to lead the refrigerant from the compressor to the outer heat exchanger. During a heating operation the three-way valve is set to lead the refrigerant from the compressor to the heat-radiating inner heat exchanger while bypassing the outer heat exchanger. The three-way valve is switched by a switching means when a target conditioned-air temperature, which is determined according to thermal information of the automotive vehicle, generally corresponds to a temperature at which clouding of windows is not caused by the relationship between a compartment temperature and an ambient temperature. Accordingly, the cooling and heating operations are stably implemented without being effected by various conditions, and the clouding of the windows is securely prevented while electric power consumption is deceased.

An air conditioner for a vehicle comprises a refrigerating cycle including a compressor, a condenser, an undercooling heat exchanger, an expansion valve, an evaporator disposed in an air duct. The air conditioner further comprises a heater core arranged at a downstream of the evaporator to pass the conditioned air therethrough, and an air-mix door for use in adjusting air flow to be passed through the heater core. The undercooling heat exchanger is disposed at the downstream of the evaporator within the air duct, and is supplied with the conditioned air when the conditioned air is sent to the heater core when the air-mix door is opened.

Growing community of inventors

Yokosuka, Japan

Takayoshi Matsuoka