Hitachi, Ltd.

Nissan Motor Company Limited

Hitachi Automotive Engineering Co., Ltd.

Hitachi Construction Machinery Co., Ltd.

Yozo Nakamura

Yuzo Kadomukai

Kenichi Nakamura

Mitsuru Nakamura

Yuji Maeda

Yoshio Okamoto

Kunihiko Takao

Kenichi Kawashima

Masao Fukushima

Naoyuki Tanaka

Kei Murakami

Tsunehiro Endo

Keiichi Mashino

Hiroaki Hata

Tokuo Kosuge

Haruo Watanabe

Shigeru Kuriyama

Eiji Hamashima

Hiroyuki Ando

Kyoichi Uchiyama

Akira Onishi

Akashi Terasaki

Masami Nagano

Kenji Tojo

Isao Hayase

Akira Arai

Yukio Takahashi

Makoto Yamakado

Naoki Tanaka

Tatsuhiko Monji

Kazutaka Suefuji

Shigeru Machida

Tsuyoshi Takahashi

Kousaku Shimada

Mineo Kashiwaya

Masahide Sakamoto

Jun Naruse

Shunichi Mitsuya

Atsushi Suginuma

Mieko Ishii

Hayato Sugawara

Atsuo Kishi

Yuuji Maeda

Eiji Sato

Toshihiko Nara

Tunehiro Endo

Shigeru Horikoshi

Kenichi Iizuka

Masakatsu Tanaka

Akihiko Ishiyama

Kazuo Ikeda

Naoki Maeda

Masaharu Ishii

Yoshihisa Uneyama

Tastuhiko Takahashi

Tsuneo Kan

Tamio Fukuda

Fumiaki Kasubuchi

Yusho Maue

Eigi Hamashima

Morio Ohshina

Koichi Maezawa

Sigeru Machida

Takeoshi Katoh

Masaaki Isono

An apparatus for detecting an angular rate of a moving body has first and second sensors each of which has a detection direction, the first and second acceleration sensors are mounted at fixed locations on a moving body so that the first and second acceleration sensors have substantially the same detection direction on a plane and a fixed distance therebetween in the detection direction, and the angular rate (.omega.) of the moving body is detected according to the following equation: ##EQU1## wherein .DELTA.G is an acceleration difference and R is the distance between the first and second acceleration sensors in the detection direction.

Angular rate detection apparatus, acceleration detection apparatus and

An apparatus induces vibrations in a generator for effectively reducing vibrations of a vehicle engine and the vehicle body due to irregular combustion of the engine. The load torque of a generator fixed to the engine is changed to generate an angle moment on the body of the generator to cancel engine vibrations due to rough idling and suppress body vibrations due to the rough idling. Irregular combustion of the engine is detected from a change in the engine speed, and a voltage higher than the output voltage of the generator is than applied across the field winding to increase the field winding current and hence the load torque on the generator, which induces vibrations on the generator body. When the generator vibrations and vibrations due to irregular combustion are in inverse phase relationship to each other, they are cancelled.

Apparatus for reducing vibrations of the body of a vehicle

An electromagnetic fuel injection valve includes a fuel swirl element disposed upstream of a valve seat for giving a swirl force to fuel, a fuel injection port disposed downstream of the valve seat, fuel dividing device disposed downstream of the fuel injection port for dividing a fuel flow.

Electromagnetic fuel injection valve

In an engine control system of the type in which engine control data is calculated for each of a plurality of cylinders, rotation angular speeds of the crank shaft are sequentially detected as individual pistons of the plurality of cylinders take an identical, predetermined stroke position, for example, top speed position and rotation speed data and control data are calculated on the basis of the detected rotation angular speed.

Engine control system

A method of reducing vibrations of a car body comprises a step of detection of rough which is irregular combustion in an engine, preferably through monitoring of angular velocity of a crankshaft of the engine, and a step of exerting such external force as will cancel roll vibrations of the engine caused by the rough on an engine block of the engine temporarily after the occurrence of the rough. A magnitude of the force and timing of exerting the force is preferably determined on the basis of a degree of the rough and the angular velocity immediately before the occurrence of the rough.

Method and apparatus for reducing vibrations of car body

An electromagnetic fuel injection valve in which an area of an annular gap formed by a ball valve and a valve seat when the ball valve is lifted is made smaller than cross sectional area of grooves provided on a fuel swirling element which gives fuel supplied a swirling force and further is made larger than a cross sectional area of a fuel injection port, whereby the fuel is injected with an excellent atomizing characteristic.

A method of detecting the condition of combustion in each cylinder of an internal combustion engine while monitoring a variation in rotation of a crankshaft in the engine for each cylinder, in which the degree of irregular combustion is judged based on the magnitude of the rotational variation, and/or in which the condition of combustion in a succeeding cylinder is judged based on the difference between rotational variations within one combustion period, of adjacent cylinders, and/or in which the rotational ascending rate within one combustion period, of each cylinder is detected to judge the condition of combustion in the cylinder based on the dropping state of the rotational ascending rate, and/or in which the rotational angular acceleration within one combustion period, of each cylinder is detected to thereby judge that a predetermined cylinder is in a condition of irregular combustion when the quantity of the variation in rotational angular acceleration between adjacent cylinders exceeds a predetermined value.

Method and apparatus for detecting and controlling combustion condition

The present invention relates to an electrical protective circuit, used when abnormality occurs, in a vibration suppressing apparatus which changes the load torque on a generator such as an alternator fixed on the engine to generate an angle moment on the generator body to cancel rough idling engine vibrations to suppress vehicle body vibrations due to the rough idling. In the inventive vibration suppressing apparatus, a generator is fixed on the engine which generator includes a voltage regulator to control a field winding current such that a fixed voltage is output to a battery. The generation of engine rough idling is detected on the basis of either a change in the engine speed or a change in the engine vibrations. If rough idling is detected, a high voltage circuit is connected to the field winding to increase the field winding current and hence the load torque on the generator. In the inventive protective circuit, the battery voltage is compared with a predetermined reference value when no rough idling is detected. If the battery voltage exceeds the reference value, a changeover signal is generated and the high voltage circuit is disconnected from the field winding in response to the changeover signal.

Protective circuit in a device for reducing vibrations of a vehicle body

In a vehicle vibration reduction control apparatus for controlling an alternator driven by an engine to charge a battery in such a way that vehicle body vibration due to the engine can be cancelled by alternator vibration, the reference voltage applied to an alternator field coil is reduced by a predetermined value for a predetermined time period, whenever battery terminal voltage exceeds a predetermined level. Since the battery charging rate can be reduced automatically at battery overcharge due to cancellation of engine vibration by alternator vibration, it is possible to prevent the battery from being overcharged when engine vibration increases at idling, for instance.

Vehicle body vibration reduction control apparatus

A magnetic disk apparatus capable of reducing the vibration thereof is disclosed, in which a linear access mechanism for driving a magnetic head is provided with anti-reaction force generating means for generating an anti-reaction force capable of offsetting a reaction force generated in driving a carriage mounted with the magnetic head.

Linear access mechanism with driving force reaction cancelling device

To substantially prevent vibrations from arising due to a torque fluctuation of an internal combustion engine, a torque fluctuation of the internal combustion engine is detected, and a torque to be absorbed or generated by a motor generator is controlled so as to decrease the fluctuation torque according to a fluctuation torque information of at least one previous engine cycle.

Internal combustion engine equipped with a torque controller

A torque control unit rotates a motor machine having a motor element and a load element. The load element is coupled to the motor element via a rotational main shaft and driven to rotate by the motor element. Rotational acceleration at each rotation angle during one revolution of the rotational main shaft is detected and fed back. An electromagnetic torque of the motor element is controlled so that a difference between the electromagnetic torque of the motor element and a load torque of the load element may become zero at each rotation angle of the rotational main shaft.

Torque control apparatus for rotating motor machine

An engine load torque controller detects the engine output torque variation as an engine speed variation and controls the load torque of an auxiliary machinary driven by the engine basing on the detected speed variation, thereby diminishing the vibration of the engine.

A torque controlling apparatus for an internal combustion engine comprises an electric machinery for absorbing torque from the internal combustion engine and/or for imparting torque to the internal combustion engine; a memory unit for storing, in advance, waveform characteristics of torque deviation generated by the engine in the respective operative conditions of the engine; a detector for detecting an operative condition of the engine; and a control unit. The control unit reads out the waveform characteristics of torque deviation, from the memory unit, corresponding to the detected operative conditions of the engine detected by the detector. The control unit controls the electric machinery to generate countertorque on the basis of the read-out waveform characteristics to cancel the torque deviation.

Torque controlling apparatus for internal combustion engine

Growing community of inventors

Ibaraki, Japan

Yozo Nakamura