Matsushita Electric Industrial Co., Ltd.

Matsushita Seiko Co., Ltd.

Ngk Spark Plug Company, Limited

Keijiro Mori

Shigeru Kusunoki

Keiichi Mori

Yasukiyo Ueda

Tomotaka Nobue

Kazunari Nishii

Takato Kanazawa

Hideaki Yagi

Shigeru Shirai

Shigeki Yamane

Hiroshi Horii

Isamu Okuda

Takashi Tanahashi

Tooru Onouchi

Takato Kanazawa, Deceased

Kyooya Sakamoto

Ichiro Shimano

Humidity sensor

PWM inverter apparatus

A method of controlling the application of heat in a food heating apparatus comprising a first heating-control mode such that the heat is applied to an object to be heated until an infrared detecting device detects that a surface temperature of the object has reached at least one predetermined temperature. A second heating-control mode effects at least one of the first heating mode wherein the heat is turned on and off repeatedly and a second heating mode wherein the output of the heat source is decreased gradually. A third heating-control mode is also provided for terminating the application of heat to the object.

Method of controlling heating in food heating apparatus including

A combustion control system having incorporated therein an electronic circuit for driving and controlling a proportional control valve provided on a fuel supply line to control the amount of combustion and thereby maintain the temperature of fluid to be heated by combustion at a constant level even when the amount of the fluid varies per unit time. The output voltage of a bridge circuit including a sensor for detecting the temperature of the fluid as a component is fed to operation amplifiers for differentiating, integrating and proportional amplification to control the control valve with the resulting output. The system is best suited for use in instantaneous water heaters.

Combustion control system

A method of food heating control in which the heating time length (.tau..sub.o) from a time point (t.sub.1) when the food temperature changing with the heating thereof reaches a predetermined set value (T.sub.1) to a time point (t.sub.2) when the vapor or gas liberated by heating of the food begins to increase the humidity or gas concentration is used as a basis for automatically determining a subsequent heating time length (.tau..sub.R). Since the time period (.tau..sub.R) for the subsequent heating process is determined by the heating time from the time point when the food temperature reaches a predetermined set value to the time point when the humidity or gas concentration begins to increase (unlike in the prior art method in which the heating time from the start of heating to the time point when humidity begins to increase is used to determine the subsequent heating time), the error in the heating time which otherwise might be caused by the variation in the initial food temperature is obviated. Consequently, it is possible to determine the total heating time without it being substantially affected by the initial temperature of the food.

Method of food heating control by detecting liberated gas or vapor and

A food heating method and apparatus are disclosed in which a heating time length suitable to the food to be cooked is determined by automatically detecting a change in humidity or concentration of the vapor or gas respectively liberated from the food. The initial temperature of the food is measured, and an additional heating time length is calculated from the measured initial temperature and the heating time length required before the detection of the humidity or gas concentration as the case may be, thus determining a total heating time length for properly cooking up the food.

Method for controlling the heating of food stuff

A heat-cooking apparatus such as an electronic oven of the type having an oven cavity, a heat source, an infrared detecting equipment adapted to detect the rate of radiation of the infrared rays from the surface of the material under cooking and a controller for controlling the heat source in accordance with the output from the infrared detecting equipment. The infrared detecting equipment includes a reflective plate and a shield cylinder which in combination ensure highly efficient and accurate detection of infrared rays over a long period of time.

Heat-cooking apparatus incorporating infrared detecting system

An electromagnetic valve comprises a magnetic circuit formed by a stationary core and a movable core, or armature pivoted at one end of the stationary core and rotatable continuously between first and second positions with a free end positioned in opposed relation to the other end of the stationary core with an air gap therebetween. The armature is spring biased so as to remain in the first position and carries a valve head for engagement with a valve seat. The opposing ends of the stationary and movable cores are so shaped as to form in the air gap a first working section in which the main magnetic flux generates a vector component transverse to the length of the armature and a second working section in which the main magnetic flux generates a vector component parallel to the length of the armature. The resulting vector makes the angular displacement of the armature linearly proportional to the supply current.

Analog displacement type electromagnetic valve

A fluid-flow control valve arrangement comprising valve means operable in different conditions including variable-flow,, constant-flow and zero-flow mode conditions depending upon predetermined ranges of a prescribed operational parameter, the valve arrangement being useful especially for the control of the flow of fuel in a heating device such as a gas-burning water heating device.

Multiple-mode fluid-flow control valve arrangement

The present invention is a pressure-electrical signal conversion means comprising a diaphragm assembly which is moved in accordance with the difference of pressure between two compartments therein, illumination means able to direct light in a band onto a photosensitive unit which includes two elements so disposed that when any particular band of the photosensitive area is illuminated the illuminated area of one element is greater than that of the other, this photosensitive element produces an output proportional to the relative size of the illuminated areas of these elements, the photosensitive unit and illumination means being movable relative to one another in proportion to the movement of the diaphragm.

Pressure-electrical signal conversion means

A fluid-flow control valve arrangement comprising valve means operable in different conditions including variable-flow, constant-flow and zero-flow mode conditions depending upon predetermined ranges of a prescribed operational parameter, the valve arrangement being useful especially for the control of the flow of fuel in a heating device such as a gas-burning water heating device.

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Nara, Japan

Keijiro Mori