Abstract: A cooling unit for an automotive air-conditioning system, comprising an evaporator, a compressor, an expansion valve connected to the inlet port of the evaporator, an accumulator connected to the outlet port of the evaporator, a temperature sensor for detecting the temperature of the refrigerant at the outlet port or within the evaporator, and temperature control means which controls the degree of opening of the expansion valve so that the temperature of the refrigerant at the outlet port or within the evaporator is maintained above a predetermined temperature which is slightly higher than a temperature at which the evaporator becomes frosted. The degree of opening of the expansion valve is increased to raise the vapor pressure of the refrigerant in the evaporator, instead of stopping the compressor, when the temperature of the refrigerant at the outlet port or within the evaporator drops to the predetermined temperature, so that the frequency of starting and stopping the compressor is reduced.

Abstract: An air conditioner for vehicle includes a cooler cooled in a cooling circuit which includes a compressor, a heat exchanger located in the vicinity of the cooler, a thermal storage tank connected with the heat exchanger via a heat transfer passage, a pump provided in said heat transfer passage, a first temperature sensor for detecting the temperature TO in close proximity to of the cooler, a second temperature sensor for detecting the temperature TC of the storage tank, and a third sensor for detecting the temperature TR in the car interior, and a heat transfer type partition wall can be integrally provided between a cooling flowing passage of the cooler and a fluid passage of the heat exchanger. The air conditioner for the vehicle serves to cause said pump to be operated to permit cooling energy to be stored when TC is greater then TO and TR is lower than a set value, and to cause said pump to be operated to permit said cooling energy to be radiated when TR is higher than the set value.

Abstract: An automotive air-conditioning system includes an arithmetic unit which provides combined control signals at least on the basis of data representing room temperature, fresh air temperature, set temperature and intensity of insolation; a blower control unit which controls the blowing rate of a blower according to the combined signals; an air mixing control unit which controls the opening of an air mixing door on the basis of the combined signals; a mode changing unit which establishes the defrosting mode, the face mode, the foot mode or the bilevel mode according to a mode changing signal based on the opening of the air mixing door and the temperature of an evaporator; a blowing rate control unit which increases the actual blowing rate of the blower gradually after the actuation of the blower; and a control unit which controls the air mixing door control unit and the mode changing unit on the basis of the temperature of the engine cooling water.

Abstract: The present invention relates to an automotive air-conditioning system comprising an arithmetic means, control means, diagnostic control means and diagnostic setting means. The invention enables one to diagnose whether output devices such as an air mixing door, a compressor or the like are normally operable or not.

Abstract: This invention relates to a vehicle air conditioning device and defroster having a control circuit for controlling a compressor, an outdoor air/inner air change-over door and a blower fan for air conditioning the vehicle room. A control switch is provided for a rear window heater wire for defrosting the window pane of the vehicle containing the wire. The vehicle air conditioner is operated in response to the operation of the rear window heater when it is energized. The rear window heater wire is turned on manually or automatically in response to an outdoor frost sensor. The compressor is operated to defrost when the outdoor air temperature is higher than the allowable operating temperature in the compressor. During operation of the control switch, the outdoor air/inner air change-over door is controlled, when the air temperature is lower than a selected allowable operating temperature, so as to increase the feeding rate of the outdoor air or to increase the feeding volume of the outdoor air.

Abstract: A driving circuit for use in controlling a motor for controlling an air mixing door, an inner and surrounding air change-over door and a mode setting door and the like used in a vehicle air conditioning device, or a motor used in opening or closing of window panes of a vehicle or in opening or closing the door which includes a control transistor for use in controlling a transistor circuit having a transistor to cause both normal and reverse directed currents to flow in a vehicle motor, the control transistor being operated until a specified period of time has elapsed after the power supply switch is turned on, the motor input being shut off by the control transistor so as to prevent erroneous operation of the motor just after the power supply switch is turned on or to prevent the production of a chattering sound caused by the operation of gear trains with the motor.

Abstract: This invention relates to a control circuit for a motor for use in driving an electrically controlled door such as an air mixing door, inner and outer surrounding air ventilation door, and mode change-over door etc. or an electro-magnetic solenoid for operating an injection pump applied in a Diesel engine or another motor for use in opening or closing a window pane etc. and protects the transistors forming the control circuit.

Abstract: A control circuit for a glow plug assembly serving as an engine preheating means is designed so as to effect a temperature control in harmony with the specified position established by selective operation of a key switch having three switching positions, i.e., OFF, ON and START positions.

Abstract: A control circuit for a glow plug assembly serving as an engine preheating apparatus is designed so as to effect a temperature control in conformity with the specified position established by selective operation of a key switch having three switching positions, i.e., OFF, ON and START positions. The control circuit comprises a first switch connected between the glow plug assembly and a power source, and a series circuit comprising a second switch connected parallel with the first switch and a resistor.

Abstract: A plunger is reciprocable in a barrel to force fuel to the injection nozzles. The portion of the barrel defining with the plunger the compression chamber is movable and is formed with a port leading to the unpressurized fuel reservoir in such a manner that the plunger uncovers the port at the end of its fuel injection stroke to overflow fuel from the compression chamber to the reservoir and terminate fuel injection. The position of the movable portion of the barrel and thereby the port relative to the plunger determines the fuel injection volume. A closed loop electronic servo system is provided to position the movable part of the barrel in accordance with the required fuel injection volume.

Abstract: In a fuel injection pump having two kinds of plungers rotatably displaced by a common rack, each of one kind of plungers ceasing fuel supply and each of the other kind of plungers supplying fuel during idling of an engine, a measuring screw-like groove of each plunger ceasing fuel supply during idling of the engine has a longitudinal groove communicating with a plunger pump chamber. The longitudinal groove is of relatively enlarged width, and a cut portion crossing at a right angle to said longitudinal groove is provided at the intersection of the longitudinal groove and the upper edge of the screw-like groove. The depth of this cut portion increases toward the longitudinal groove.

Abstract: A fuel injection device for Diesel engines comprising a fuel system which includes a throttle member adapted to change the injection time corresponding to a variation in rotation of an engine and to meet such variation to rotary angle of the engine required for injection.

Abstract: A fuel injection device for internal combustion engines, comprising: a source of pressurized fuel supply, a fuel distributor-controller by means of a rotor rotating in a stationary sleeve and fuel injection valves each being integrally composed of a large-diameter servo piston, a small-diameter plunger and a nozzle the fuel injection quantity control mechanism and injection-timing control mechanism utilizing the variable pressure produced by throttling, under control, the oil returning from the servo piston.

Abstract: A unit injector for a diesel engine wherein a spool valve body is connected with a pressurizing chamber in a main body so that fuel to be supplied from a fluid element is supplied into the pressurizing chamber to affect the injection stroke of a pump plunger and the spool valve is actuated by the supplied fuel pressure to be supplied by the fluid element.

Abstract: A hydraulic, automatically adjustable timing device for fuel injection wherein vanes of rotor and radial members of casing form operating chambers, each having a passage to permit fluid in and out; a pilot valve is disposed in the drive shaft, is rotatable by centrifugal force of flyweights and controls the opening and closing of fluid chambers, resulting in rotational transmission and relative movement between the shafts through fluid present in the chambers; and a flat shaft of the pilot valve forms lands to control communication of the flow passage with the fluid chambers.