Nippondenso Co., Ltd.

Katsumasa Matsui

Masahiro Ohba

Tohru Kakehi

Takayoshi Kawai

Satoshi Hirano

Kazutoshi Nishizawa

Toru Yamazaki

Hideaki Namba

Hiroaki Kuraoka

Hiroshi Sugimoto

Hidemichi Tanabe

Toshinori Mizuno

Hisahiro Miura

Toru Kakehi

Toru Kamiya

A refrigeration cycle or an air conditioner including a refrigeration cycle is subjected to feedback control based on modern control theory. An apparatus controlling a controlled object, that is, the refrigeration cycle of the air conditioner including the refrigeration cycle, is formed as an optimal regulator. A controlled input to the controlled object includes a capacity of a compressor or a degree of opening of an expansion valve. A control output from the controlled object includes a temperature of air at a point downstream of the evaporator or a superheat of refrigerant. Feedback gains are predetermined by use of dynamic models constructed for respective steady operation states of the controlled object.

Refrigeration cycle control apparatus

Disclosed is an air conditioner for automobiles comprising an air conditioning unit for adjusting at least temperature of blow-off air discharged into a vehicle compartment, a decision device for determining whether the air conditioning unit is in an initial state that the air conditioning unit is started, and an air conditioning control unit for feedback controlling the air conditioning unit so that the detected internal temperature becomes equal to the set target temperature. The air conditioning control unit is formed as an integral-added optimal regulator which performs the feedback control on the basis of optimal feedback gain predetermined in accordance with a dynamic model of an air conditioning system. The air conditioning control unit outputs to the air conditioning unit controlled variables decided in accordance with the results of the determination made by the decision device.

Air conditioner for automobiles

In an air conditioner for automobiles, control unit for performing feedback control of blow off air is constructed in the form of an integral-added optimal regulator (M4) which performs the feedback control on the basis of optimal feedback gain predetermined according to dynamic model(s) of an air conditioning system including the vehicle compartment (M1) and the used air conditioning unit (M2). According to another feature of the present invention, an environmental condition, such as solar radiation to the vehicle compartment (M1), is detected to further accurately control the internal air temperature. In one embodiment, the internal variables including optimal feedback gain of the integral-added optimal regulator (M4) are changed in accordance with the variation in the dynamic model depending on the detected environmental condition. In another embodiment, in addition to the above-mentioned feedback gain, feedforward gain is used so as to finally determine controlled variables of blow off air control unit (M2). Furthermore, according to another feature of the present invention, temperature control may be performed at a plurality of different positions within a vehicle compartment using a plurality of air conditioning units without suffering from interference between a plurality of airflows.

A case for accommodating an electronic circuit for an electronic control system mounted on a vehicle is formed of an electric conductor and is electrically isolated from the grounding terminal of the electronic circuit which is provided on a printed substrate. Further, the outer boundary of a signal line for signal transmission between the electronic circuit and external circuits or sensors of the case is connected to the case through capacitors, thus preventing the faulty actuation of the electronic control system which otherwise might be caused by the electromagnetic wave.

Vehicle-mounted electronic apparatus

An engine crank angle determining arrangement including a rotor having teeth or slits wherein either a tooth is entirely omitted or the teeth or slits are formed with non-uniform intervals therebetween. The teeth or slits are detected by an electromagnetic pick-up device or a photocoupler, and the time intervals corresponding to the intervals between the teeth or slits in the signal thus detected are processed in accordance with a predetermined program. The time intervals thus processed are corrected in consideration of an engine low state or non-low state operating condition, such as for example transient condition or starting condition, of the engine. Processing is carried out in either of two different ways of calculating reference angles. One is based on a ratio of time differences between adjacent sensible elements when the engine is operated in a 'low state', and the other is based on a time difference between the detected times of adjacent sensible elements when the engine is operated in a 'non-low state'. Accordingly an accurate angular position can be detected regardless of a single set of the pulse generating device and pulse detecting device.

Rotational reference position detection apparatus

Growing community of inventors

Okazaki, Japan

Katsumasa Matsui