Hitachi, Ltd.

Hitachi Automotive Engineering Co., Ltd.

Takao Sasayama

Kazuo Kato

Matsuo Amano

Masayuki Miki

Shinichi Sakamoto

Yoji Nishio

Ikuro Masuda

Seiko Suzuki

Takeshi Hirayama

Shigeo Kuboki

Masahiro Iwamura

Sadayasu Ueno

Seiji Suda

Shigeru Oho

Hideo Sato

Satoshi Shimada

Kazuji Yamada

Kanji Kawakami

Yasunori Mouri

Masahiro Komachiya

Masayoshi Suzuki

Torazo Nishimiya

Yoshishige Oyama

Yutaka Nishimura

Junichi Horie

Teruo Yamauchi

Masami Shida

Norio Ichikawa

Masahide Sakamoto

Osamu Abe

Kanemasa Sato

Toshitaka Suzuki

Masahiro Kurita

Yukiko Sugisawa

Seikoo Suzuki

Keizi Hanzawa

Yuuji Ogasawara

Masahiro Matsumoto

Akira Endo

Keiji Hanzawa

Norio Hasegawa

Hiroshi Kuroiwa

Takeshi Atago

Toshio Ishii

Akira Ikegami

Minoru Takahashi

Takanori Shibata

Nobuo Sato

Mamoru Fujieda

Takashi Sase

Yoshikazu Hoshi

Atsushi Kanke

Mineo Kashiwaya

Seikou Suzuki

Minoru Osuga

Terumi Nakazawa

Masayoshi Naito

Masumi Imai

Shirou Baba

Hisanori Moriya

Toru Sugawara

Takao Teranishi

Tadahiko Otani

Ryosaku Kanzawa

Tatsunori Sakaguchi

Naoki Minami

Takayuki Fumino

Shiro Ouchi

Yukitaka Kitadate

Matsuo Amamo

Seikoh Suzuki

An in-cylinder pressure sensing apparatus for a multi-cylinder engine has a plurality of sensing parts packaged between a cylinder head and a cylinder block of an engine having a plurality of cylinders and being operative to detect a signal indicative of an internal pressure of each of the plurality of cylinders. A detection circuit is provided for connecting the sensing parts in series and for overlapping detection signals obtained from the individual sensing parts to take out a resulting overlapped signal. A reference signal generator operates to supply a reference signal for separating detection signals corresponding to the individual cylinders from the overlapped signal. A unit is also provided for separating the detection signals, detected in accordance with pressures of the individual cylinders, from the overlapped signal on the basis of the reference signal.

In-cylinder pressure sensing apparatus for multi-cylinder engine

An optical fiber pressure sensor for measuring a pressure on the basis of an optical power loss depending on a configuration change of an optical fiber comprising a luminescence device optically connected with at least an optical fiber which is constructed with a main part for propagating a light protective coating member for protecting the main part. A light intercepting device detects a light passing through the optical reflected light from the optical fiber. A bending device bends at least a part of the optical fiber according to a measured pressure. The optical fiber pressure sensor is characterized by being used when a normalization frequency V value of the optical fiber is smaller than 90% of a normalization cut-off frequency defining a single transmission mode condition of the optical fiber.

Optical fiber pressure sensor

An engine combustion control apparatus includes a pressure sensor provided at each of the cylinders in an engine, for detecting the pressure in each cylinder, and a controller for calculating the state variables of the intake amount and combustion temperature in each cylinder, based on the detected pressure values, and for controlling the operational variables such as the fuel amount to be injected, fuel injection timing, and so forth, based on the calculated state variables.

Engine combustion control apparatus

A physical quantity detecting apparatus comprises at least one optical fiber, at least one light emitting means for emitting an incident light beam on the optical fiber, at least one light receiving means for detecting an outgoing light beam from the optical fiber, physical quantity applied position information generating means for providing information indicative of a position of a portion at which a physical quantity is applied to the optical fiber, and operation means for receiving signals from the light receiving means and physical quantities applied position information generating means and calculating a change with time in physical quantity at respective positions on the optical fiber.

Physical quantity detecting apparatus and internal combustion engine

A capacitance acceleration sensor and method of making same are disclosed. A capacitance acceleration sensor includes a movable electrode etched from a silicon plate which is clamped between two solid dielectric plate members of glass, silicon oxides, or oxygen oxides. Static electrodes are secured to surfaces of the dielectric members facing opposite the movable electrode, thereby providing easy manufacturing assessibility for leadout wires from these electrodes. In certain embodiments, the movable electrode is formed integrally with a monocrystalline silicon plate member which also contains an integrated circuit for generating an output acceleration signal in response to movement of the movable electrode when the assembly experiences acceleration forces.

Method of making a capacitance type acceleration sensor

A capacitance detector comprises switches for charging and discharging a sensing part, an integrator constituted by a condenser and an operational amplifier for integrating a charging current or a discharging current which is generated according to the charging and discharging the sensing part, a switch for charging an output voltage of the operational amplifier and for feedbacking an electric charge to the integrator, and a condenser. The capacitance detector can be provided by the operational amplifier having a low response performance and a small output current and no hold sample circuit, thereby a circuit scale of the capacitance type sensor can be made small.

Capacitance type sensor device

A capacitance acceleration sensor includes a movable electrode etched from a silicon plate which is clamped between two solid dielectric plate members of glass, silicon oxides, or oxygen oxides. Static electrodes are secured to surfaces of the dielectric members facing opposite the movable electrode, thereby providing easy manufacturing assessibility for leadout wires from these electrodes. In certain embodiments, the movable electrode is formed integrally with a monocrystalline silicon plate member which also contains an integrated circuit for generating an output acceleration signal in response to movement of the movable electrode when the assembly experiences acceleration forces.

Capacitance type acceleration sensor

A high-speed operation, low-power consumption gate circuit structure comprises a combination of complementary field-effect-transistors and bipolar transistors and discharge means for discharging accumulated charges from these transistors when the field-effect-transistors and bipolar transistors are turned off.

Gate circuit of combined field-effect and bipolar transistors

An air fuel ratio detecting arrangement using a diffusion suppressing type air fuel ratio sensor applicable to an air fuel ratio control unit for an internal combustion engine incorporating an atmospheric air pressure correction circuit in a signal processing and outputting device for correcting an output voltage signal processed therein based on a change in atmospheric air pressure which is detected when a predetermined operating condition of an internal combustion engine is satisfied. A secular change correction circuit included in the signal processing and outputting device detects a change in electromotive force of a concentration cell portion of the air fuel ratio sensor when a predetermined rich air fuel ratio is reached and corrects a reference voltage for the air fuel ratio sensor based on the detected change in electromotive force of the concentration cell portion in addition to an air calibration circuit.

Air fuel ratio detecting arrangement and method therefor for an internal

Gate circuit of combined field-effect and bipolar transistors with an

A high-speed operation, low-space consumption gate circuit structure-comprises a combination of complementary field-effect-transistors and bipolar transistors and discharge means for discharging accumulated charges from these transistors when the field-effect-transistors and bipolar transistors are turned off.

An oxygen sensor is disclosed in which an airtight reference chamber isolated from a surrounding space is formed on one main surface of a solid electrolyte, a current is supplied to the solid electrolyte to pump out oxygen from the reference chamber in such a manner that oxygen in the reference chamber is ionized and then passes through the solid electrolyte, means is provided for transferring oxygen from the surrounding space to the reference chamber in such a manner that oxygen in the surrounding space is ionized and then passes through the solid electrolyte, and the oxygen concentration in the surrounding space is detected on the basis of the current supplied to the solid electrolyte.

Oxygen sensor

CMOS-BiCMOS gate circuit

An air-fuel detection system comprising a solid electrolyte, first and second electrodes formed on the surface of the solid electrolyte, a diffusion resistor formed on the first electrode for controlling the gas diffusion into the first electrode, and a detector circuit for detecting conditions of the engine exhaust gas to detect the air-fuel ratio thereof, wherein the detector circuit measures the electromotive force generated between the first and second electrodes during a first period, and controls a selected one of the voltage and current applied between the first and second electrodes to keep the electromotive force constant during a second period, the selected one of the voltage and current being produced as a signal representing the air-fuel ratio.

Air-fuel ratio detection system for engine exhaust gas

A novel method of controlling air-fuel ratio for an internal combustion engine is disclosed, which comprises a memory area for holding regional compensation factors used for air-fuel ratio control, a memory area for holding new regional compensation factors obtained by learning, and a memory area for holding regional compensation factors based on the result of the learning immediately before the latest learning, thus rationalizing the new setting and updating proceses of regional compensation factors according to the result of learning.

Method of controlling air-fuel ratio

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Hitachi, Japan

Takao Sasayama