Hitachi, Ltd.

Hitachi Automotive Engineering Co., Ltd.

Tsuneo Kagohata

Toshikazu Ito

Akira Tezuka

Masashi Suzuki

Atsushi Suginuma

Reijiro Takahashi

Kenichi Chonan

Hideo Usui

Hyosei Horiguchi

Toshiki Iijima

Shiyuuichi Shimizu

Hyousei Horiguchi

Ken Funasaki

Toshikatsu Ito

A car built-in type one-chip microcomputer including a ROM, a RAM, and an input/output port, wherein a control program which is executed on the car built-in type one-chip microcomputer is stored in a high level language, so that formation, change and verification of a control program can be easily carried out by an ordinary programmer who has never been trained to treat an assembly language. Even if the kind of the microcomputer is changed, it is not necessary to change the control program. The program can be modified as a result of experiment. A program developed by a program developing apparatus can be used, as it is compatible with the microcomputer.

Controller for controlling a system in a car, including a single chip

An air conditioner is provided for a motor vehicle which controls the division of the blow-out air by individually adjusting the blow-out air temperature of the center vent, right side vent and left side vent over a broad temperature range. The blow-out air temperature is controlled from the upper and lower and right and left blow-out parts by the passengers of the motor vehicle to place the cabin of the motor vehicle into a comfortable temperature range. The conditioned air within the conditioned air passages is responsive to load conditions both inside and outside of the passenger compartment to individually adjust the temperature of the conditioned air. A first and second auxiliary duct which introduces cool air from the upstream side of the air mix door and warm air from the downstream side of the heater unit into the conditioned air flows through the right side vent duct, and left side vent duct, respectively. Each of the auxiliary ducts includes a temperature control door to adjust the mixture ratio of the cool and warm air. A control unit utilizes a target temperature for each the left side vent blow-out port and the right side vent blow-out port by utilizing the blow-out air temperature from the center vent blow-out port as a reference temperature, and temperature control doors are actuated so that the predetermined target temperatures are reached.

Air conditioner for motor vehicle having right, left and center

A blowout temperature control apparatus of an air conditioner for automobiles comprises blowout temperature control means including blowout mode detecting means for detecting one of the outlet ports associated with blowout air temperature detecting means through which delivery of air is being stopped and generating a blowout stop signal, and blowout stop timed control means, responsive to the generation of the blowout stop signal, for controlling an air mixing door associated with the outlet port to temporarily change the amount of heat exchange of the heat exchanger to a reference level (Full Cool) and again change the heat exchange amount to a predetermined constant level complying with individual blowout modes and for maintaining the heat exchange amount at the constant level while the blowout stop signal is valid.

Blowout temperature control apparatus of air conditioner for automobiles

Disclosed is a solar radiation sensor apparatus. A light-blocking plate is provided above the light-receiving surface of a photoelectric element, and has an area smaller than the area of the light-receiving surface. The incident angle sensitivity characteristic of the sensor apparatus can be improved without involving any increase in the external dimensions of the sensor apparatus.

Solar radiation sensor for use in an automatic air conditioner

An air mixing type automotive air-conditioner is disclosed in which an air fed by a blower is heated to a hot air by a hot water type heater, and a mixture ratio between a cold air flowing through a bypass passage around the heater and the hot air is adjusted by an air mixing door used as an adjustment damper. The air-conditioner comprises an outside temperature sensor for generating a first signal, a room temperature setter for generating a second signal, a room temperature sensor for generating a third signal, a first arithmetic unit for calculating a desired blown air temperature on the basis of the first and second signals, and a second arithmetic unit for calculating and controlling a desired blown air flow on the basis of the second and third signals. The air-conditioner is so controlled as to obtain the blown air temperature most suitable for a thermal load of the air-conditioner.

Automotive air conditioner

A temperature controller for automobile air conditioner comprises first computation means which calculates, in correspondence to each delivered air temperature, a unit variation of heat exchange output required to vary the temperature of air delivered by the air conditioner by a unit temperature difference, a second computation means which calculates the amount of variation of heat exchange output, which is required to bring the delivered air temperature close to a target temperature, based on the target temperature, the detected temperature and the unit variation, and control means which controls the heat exchange output intermittently in compliance with the amount of variation evaluated by the second computation means.

Temperature controller for automobile air conditioner

In a blowout temperature control system of an air conditioner for use in vehicles, a temperature detected by a ventilation duct sensor is weighted by a first weighting ratio which varies depending on a wind amount of a ventilation duct. A temperature detected by a defroster duct sensor is weighted by a second weighting ratio which is determined by the first weighting ratio. The weighted mean is calculated from the weighted detection temperatures of the ventilation duct and defroster duct, so that a substantial blowout temperature is determined. A deviation temperature between the substantial blowout temperature and an object blowout temperature is calculated and the blowout control is performed such that the deviation temperature becomes zero.

Blowout temperature control system

A control apparatus of an air conditioner for automobiles comprises: means for calculating a room temperature difference signal; means for calculating a reference blowout temperature; means for correcting the reference blowout temperature, thereby calculating a target blowout temperature; and means for controlling the heat exchanger such that the difference between the target blowout temperature and the actual blowout temperature becomes zero. This control apparatus can always maintain and manage the blowout air temperature at which the passenger can feel most comfortable for various ambient temperature conditions.

Control apparatus of air conditioner for automobiles

An air conditioning method for controlling a room temperature by an air conditioner which controls a temperature control element in accordance with a required cooling power in the room. A temperature of chilled air blown out of a chilled air blow-off port of the air conditioner is directly or indirectly monitored, and if the chilled air temperature is lower than a predetermined temperature, the chilled air blown out of the blow-off port is prevented from becoming colder than a predetermined temperature even when the chilled air temperature would become lower than the predetermined temperature if the temperature control in accordance with the required cooling force in the room is applied.

Temperature control method and apparatus for air conditioner

In an air conditioning system for automobiles including a temperature control apparatus having temperature setting device for setting a vehicle compartment temperature, a temperature sensing device for sensing an actual vehicle compartment temperature, a temperature difference signal device for generating a difference signal in accordance with a difference between the set vehicle compartment temperature and the sensed actual vehicle compartment temperature, and air flow control device for controlling the rate of air flow from a blower so as to provide varying air flow rates up to a maximum air flow rate in accordance with the value of the difference signal, a detecting device for detecting that the air condition system is at a heating operation, and a control arrangement responsive to the output from the detecting device and the value of the difference signal for controlling the air flow rate control device so that the rate of air flow from the blower is maintained at a predetermined flow rate which is less than the maximum air flow rate independent of the difference between the set temperature and the actual vehicle compartment temperature when the difference exceeds a predetermined value.

Temperature control apparatus for automobile air-conditioning systems

Disclosed is a temperature control system for airconditioners having air blend doors which are controlled by electrical signals related to the room temperature such that the amount of cool air to be reheated by a heater and the amount of cool air bypassing the heater have an appropriate proportion so as to achieve a desired room temperature, and a sensor which provides an electrical signal representing the degree of opening of the air blend door. The degree of opening of the air blend door is recognized with reference to the electrical signal from the sensor corresponding to the full-closed position or full-open position of the air blend door. The system has a function of zero-adjusting the sensor automatically following the control operation.

Temperature control system for air conditioners

A control apparatus for an air conditioner of an automobile transmits an air conditioning signal from a control panel of the automobile to a control circuit of the air conditioner through a power supply in order to control the air conditioner. The control panel includes an encoder for binary-encoding the air conditioning signal so that the binary coded signal is transmitted to the control circuit through the power supply, and a decoder for decoding the binary coded signal.

Growing community of inventors

Ibaraki, Japan

Tsuneo Kagohata