Nissan Motor Company Limited

Toshimitsu Nose

Hideyuki Sakamoto

Toshio Ohashi

Ikuo Kiminami

Masaki Kaiju

Koichi Doi

In an automotive automatic air conditioning system having at least a variable displacement compressor, a condenser, an expansion valve, and an evaporator; an improvement comprising a refrigerant temperature sensor disposed between the outlet of the expansion valve and the inlet of the evaporator for detecting a refrigerant temperature, and a controller for setting a target refrigerant temperature are disclosed. The controller controls the discharge of refrigerant from the compressor such that the refrigerant temperature reaches the target refrigerant temperature. Thus, the system provides optimum dehumidification under conditions of high humidity and relatively low ambient temperature, such as a rainy spell in autumn.

Automotive automatic air conditioning system with variable displacement

An automatic air conditioning system for automotive vehicles with a variable displacement compressor comprises a sensor for detecting an intake air temperature, defined by a temperature of air flowing through an evaporator, placed just behind the evaporator, an intake pressure sensor for detecting an intake manifold pressure, and a CPU for determining whether the cooling requirements of the evaporator are satisfied on the basis of the intake air temperature compared to a predetermined value. The CPU controls the compressor in such a manner that the discharge volume of refrigerant discharged from the compressor is decreased only when the cooling requirements are met. Thus, the automatic air conditioning system prevents uncomfortably warm conditioned air from being discharged through a vent door under acceleration conditions.

Automatic air conditioning system with variable displacement compressor

An automatic air conditioning system for automotive vehicles with a variable displacement compressor comprises a sensor for detecting an intake air temperature of air flowing through an evaporator placed just behind the evaporator, a control valve for essentially changing the discharge volume of the compressor on the basis of the difference between the intake air temperature and its target value, and a CPU for deriving the different target values in response to two modes, namely a BI-LEVEL mode wherein conditioned air is simultaneously discharged from both upper and lower discharge outlets, and a MONO-LEVEL mode wherein conditioned air is discharged from either the upper or lower discharge outlets. The control valve operates in such a manner that, when the difference is plus, that is, the intake air temperature is higher than the target value, the discharge volume is essentially increased, and when the difference is minus, that is, the intake air temperature is lower than the target value, the discharge volume is essentially decreased. Thus, in the BI-LEVEL mode the amount of air reheated by a heater unit becomes larger than the amount of reheated air in the MONO-LEVEL mode. According to the invention, the BI-LEVEL mode effect can be sufficiently satisfied, particalarly, in a fuel-saving mode wherein the difference between the intake air temperature and the temperature of air to be discharged from the discharge outlets is very small.

Automatic air conditioner system with variable displacement compressor

An automatic air conditioning system for automotive vehicles with a variable displacement compressor comprises a sensor for detecting an intake air temperature of air flowing through the evaporator placed just behind the evaporator, a control valve for the compressor essentially changing the discharge of said compressor on the basis of the difference between the intake air temperature and its target value, and a CPU for changing the target value of the intake air temperature. When the CPU does not receive a signal indicative of a requirement for quick-cooling, the target value is set to a freezing start possible temperature defined by an intake air temperature such that the freezing of the evaporator starts, and when the CPU receives the signal indicative of a requirement for quick-cooling, the target value is set to a predetermined temperature lower than the freezing start possible temperature. Thus, the automatic air conditioning system is capable of maintaining a high displacement of refrigerant in spite of the lowering of suction pressure of the compressor, related to the dropping of the intake air temperature, when the quick-cooling is required.

Automatic air conditioning system with variable displacement compressor,

A controller for automotive air conditioner system includes first and second control units which are cooperable for controlling the condition of air supplied to the vehicular cabin. The first control unit has side edges, each of which engages the channel between horizontally extending rails formed on the inner surface of the side wall of the controller body. The first control unit can disengage from the channel to be detachable from the controller body so as to allow another control unit having edges of the same shape as those of the first control unit to be substituted for the first control unit.

Controller for air conditioner system for automotive vehicle

An expansion valve having a pressure chamber for changing its inside pressure, an expansion chamber provided with an orifice at a hole formed between a primary path and a secondary path, and a valve member provided within the expansion chamber, the position of the valve member being normally biased by one end of a spring in the direction of closing the orifice, in which the expansion valve further comprises an actuator having a solenoid, a rod coupled to the spring, and an action plate which is attracted by the solenoid when the solenoid is biased. With this construction, an additive force is applied to the spring and the opening of the orifice can be adjusted by a combined action of the distinctive force of the spring plus the additive force of the actuator through the valve member in the initial period of cooling condition in accordance with the change in the temperature of the evaporator, thereby adjusting the superheat.

Expansion valve

An air-conditioning system for a vehicle is configured so as to adjust draft volume to a condensor for an air conditioner on the basis of the pressure of refrigerant circulated through a condensor and atmospheric temperature to optimize draft volume to be distributed to the condensor and the radiator. The air-conditioning system comprises a plurality of motor-fans for the condensor and the radiator, a refrigerant pressure sensor provided at the input and output of the condensor, an atmospheric temperature sensor, and an operational mode control unit responsive to the refrigerant pressure sensor and to the atmospheric temperature sensor.

Air conditioning system for vehicle

A cooling system for a vehicle is configured so as to adjust draft volume to the radiator through which engine cooling water is circulated on the basis of the engine operating condition e.g. the temperature of engine cooling water. The cooling system comprises a plurality of motor-fans for cooling the radiator, engine cooling water sensor means provided at radiator hoses, and operational mode control means responsive to the sensor means to selectively control operational modes including a parallel drive mode, a serial drive mode, a partial or single drive mode and an OFF mode. Thus, a desired power supply control for motor-fans is carried out in accordance with an operational mode selected by the operational mode control means, thereby enabling to finely adjust draft volume to effect a desired cooling of the engine.

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Kanagawa, Japan

Toshimitsu Nose