Hitachi, Ltd.

Hitachi America, Ltd., Research and Development Division

Hitachi America, Ltd.

Other

Toshiharu Nogi

Takuya Shiraishi

Minoru Ohsuga

Noboru Tokuyasu

Yoko Nakayama

Mamoru Fujieda

Yoshishige Ohyama

Yoshihiro Sukegawa

Yoshishige Oyama

Yusuke Kihara

Minoru Oosuga

Teruo Yamauchi

Shiro Yamaoka

Frank W Hunt

Yutaka Takaku

Yuusuke Kihara

Nobuyasu Kanekawa

Nobuo Kurihara

Atsushi Shimada

Yoichi Iihoshi

Jun'ichi Yamaguchi

Youichi Iihoshi

Robert I Bruetsch

Hiroyuki Yamada

Hiroshi Kuroiwa

Toshio Ishii

Masami Nagano

Tohru Ishikawa

Shinji Nakagawa

Takanobu Ichihara

George Saikalis

Toshimichi Minowa

Hiroshi Fujii

Hiroshi Kimura

Takashi Yoshida

Yuzo Kadomukai

Yoshio Okamoto

Masatoshi Hoshino

Motoyuki Abe

Kazuo Tahara

Yoshiyuki Tanabe

Shigenori Togashi

Ayumu Miyajima

Hiroaki Saeki

Mineo Kashiwaya

Hiromasa Kubo

Minoru Osuga

Toru Ishikawa

Keigo Naoi

Shigeyuki Nonomura

Masayuki Shizuka

Shiro Yamoaka

Yoshishige Ooyama

Shigeyuki Kemma

An apparatus for reducing noxious gases in the exhaust emissions of an automobile is disclosed. During engine cold start, a cold start injector having a heater downstream of the injector outlet vaporizes fuel so that a leaner air-fuel mixture can be used, thereby reducing engine emissions before the engine and catalytic converter warm up. The heater includes various configurations for swirling the fuel and exposing it to large surface areas for improving the vaporization of the fuel. A tapered bore surrounding the throttle allows for precise air flow control into the cold start device during engine warm-up.

Cold start engine control apparatus and method

By a lean burn operation, a highly efficient operation region is enlarged, the proportion of engine operation in a low torque condition is increased, and the proportion of motor operation using a battery is decreased. It is possible to provide a hybrid car of an engine-electric motor configuration which can effect a highly efficient operation without increasing the capacity of motor and that of battery.

Hybrid car

Satisfactory restartability has not been obtained so far because the timing of opening an exhaust valve of a cylinder under expansion stroke is adjusted for improvement of startability and a valve adjusting mechanism is always controlled in the same manner regardless of the engine status at start. In the invention, control is performed to adjust the timing of closing an intake valve so that an effective compression ratio of a cylinder under compression stroke reduces. Also, the effective compression ratio of the compression stroke cylinder is decided based on a piston position at engine restart. By varying the intake valve closing timing in the expansion stroke cylinder to reduce the effective compression ratio depending on the engine status at restart, it is possible to lessen a load imposed on a starter when the engine is restarted, and to improve startability without complicating the engine system.

Internal combustion engine control method

In a multi-cylinder engine having a compression ignition combustion mode, a vibration detecting sensor that is preferably mounted in a cylinder block or a cylinder head is used to detect a frequency and the detected frequency is appropriately analyzed to detect or estimate a cylinder pressure peak value and peak timing for each cylinder. An amount of internal EGR, a fuel injection condition, an engine speed and the like are then controlled so as to bring each of these parameters into an appropriate range thereof. The control apparatus suppresses variations in combustion states among different cylinders and different cycles arising from unit-to-unit variations or deterioration in the engine or part-to-part variations or deterioration in a component thereof.

Control apparatus and control method for multi-cylinder engine

The amount of air to be introduced is controlled for each cylinder, whereby it is intended to make it possible to control the torque generated in each cylinder, perform an ultra-lean burn operation, purify the exhaust gas, and increase the output of an engine. An air flow control valve adapted to be on-off controlled in accordance with an operated quantity of an accelerator pedal is disposed in each branch pipe or intake port. The air flow control valve may be a throttle valve disposed in each branch pipe or it may be a variable intake valve for opening and closing the intake port.

Internal combustion engine, and control apparatus and method thereof

There is provided a cylinder injection type internal combustion engine capable of performing stratified charge operation at the time of a vehicle speed of 120 km/h and/or an engine rotational speed of 3200 rpm to enhance the fuel efficiency and/or to observe the emission regulations. In the internal combustion engine, a stratum of air and/or air flow is formed between a fuel spray injected from an injection valve and the top face of a piston and/or the wall surface of a combustion chamber, and a face shape contrived to guide the air flow is formed on the top face of the piston. Also, the stratified charge operation can be performed even at the time of cold start or cranking.

Cylinder injection type internal combustion engine, control method for internal combustion engine, and fuel injection valve

A control apparatus operates a compression ignition internal combustion engine by switching between spark ignition combustion using an ignition device and compression ignition combustion which self-ignites a mixture by piston compression. Variable valve mechanisms vary at least one of the valve timings and valve lifts of an intake valve and an exhaust valve. Intake air is regulated to vary the amount of air intake into a combustion chamber on the upstream side of a combustion chamber inlet of the compression ignition internal combustion engine. The variable valve mechanisms and the intake air regulation are controlled during the compression ignition combustion so as to perform the compression ignition combustion.

Compression ignition internal combustion engine

A gasoline engine is provided which is capable of introducing a large amount of EGR gas for performing homogeneous combustion and thus offering a good fuel economy. An external EGR mechanism or an internal EGR mechanism is used to introduce an EGR gas into a combustion chamber (a cylinder). A mixture of fresh air and fuel is thereafter directly injected from a mixture injection valve into the combustion chamber, thereby forming a region of said mixture in an area near an ignition plug. In addition, engine operating parameters are controlled in accordance with the amount of fresh air supplied into the combustion chamber (cylinder) after an intake valve has been closed. This makes possible homogeneous combustion using a large amount of EGR, which eventually increases fuel economy.

Control apparatus for internal combustion engine and control method for internal combustion engine combustion method for internal combustion engine and direct injection engine

To perform fuel injection under fuel pressure as high as needed in an operation range of from cranking to self-sustaining operation via full expansion. A fuel supply fuel system for a direct fuel injection type internal combustion engine is provided with a high-pressure fuel pump to directly inject fuel, which has been pressurized by the high-pressure fuel pump, from injectors into combustion chambers of the engine. An electromotor is arranged to auxilially drive the high-pressure fuel pump At the time of a start-up of the engine, driving of the high-pressure fuel pump or an assist to drive torque for the high-pressure fuel pump is performed by the auxiliary power means.

Fuel supply system and method of direct fuel injection engine

A compression ignition internal combustion engine includes a combustion chamber, an intake valve, intake port, and an exhaust valve. The temperature and pressure in the combustion chamber are increased to self-ignite an air-fuel mixture with the compressive operation of a piston after closing of the intake valve. A fuel injection valveinjects pressurized air, serving as an ignition trigger factor, directly into the combustion chamber so that the air-fuel mixture under the expansion stroke of the piston is brought into an ignitable state. An ECUcontrols the injection timing of the pressurized air depending on the ignition timing. The self-ignition timing can be controlled to a proper timing in a wide engine operating range with respect to a load and a revolution speed without changing the shape of the combustion chamber to a large extent.

In a direction-injection engine incorporating a turbocharger, fuel combustion is improved to enhance fuel economy within the high-load range of engine torque, and furthermore to control occurrence of smoke in the range of great load within the lean-burn range. Scavenging acceleration control is conducted to scavenge the exhaust gases in the combustion chamber by using at least one of the intake pipe pressure, the combustion chamber pressure, and the exhaust pipe pressure, and the fuel is injected twice during the intake stroke and the compression stroke.

Direct-injection engine with turbocharger and method of controlling the same

A fuel injection equipment to control the instability of combustion when the airflow is weak, and improve the fuel cost. A fuel injection equipment for an cylinder injection type and spark ignition type internal combustion engine that injects gasoline directly to a combustion chamber, wherein the top angle at the point of fuel spray in the pressurized atmosphere of absolute pressure 0.5 MPa is from &#x2212;10&#xb0; to 10&#xb0;. Further, the fuel is injected at the compression stroke of the internal combustion engine which installs the fuel injection equipment, and said internal combustion engine is started.

Fuel injection equipment, internal combustion engine, and control method of fuel injection equipment

The present invention is intended to provide a control system for an direct injection internal combustion engine capable of effectively reducing the amounts of both HC and NOx exhausted from a combustion chamber during a period from the start of the engine operation to the stop of the engine operation. It comprises an external EGR passage () for returning a part of exhaust gas from an exhaust pipe () to an intake pipe (), an external EGR control valve () for controlling an amount of exhaust gas returned to the external EGR passage (), and a valve timing varying mechanism (A,B) for varying timing of opening and closing at least one of an intake valve and an exhaust valve. An ECUcontrols the valve timing varying mechanism (A,B) to always return internal EGR gas in an operation region where exhaust gas recirculation is required, and controls the external EGR control valve () to return exhaust gas in a combination of internal EGR and external EGR when an internal EGR rate provided by the valve timing varying mechanism (A,B) is not sufficient to satisfy an EGR rate demanded depending on an operation state.

Controller of cylinder injection type internal combustion engine

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Hitachinaka, Japan

Toshiharu Nogi