Toyota Jidosha Kabushiki Kaisha

Tomomi Yamada

Keiji Yoeda

Makoto Ogiso

Hideyuki Nishida

Shouji Katsumata

Kazuhiko Shiratani

Yoshihiro Iwashita

Kiyoshi Nakanishi

Takamitsu Asanuma

Yuji Miyoshi

Isao Matsumoto

Masaaki Tanaka

Shigeo Kikori

Ryo Hasegawa

Junichi Murase

Yukitoshi Aoyama

An internal combustion engine is provided with a variable mechanism capable of adjusting the amount of intake air introduced into each cylinder by controlling the operation angle of intake valves. In a low-load region, the intake valve operation angle is minimized, and the amount of intake air is controlled on the basis of the degree of throttle opening. In the low-load region, the operation angle of each valve is set so that there is no period during which both an intake valve and an exhaust valve are open. In a high-load region where the intake pipe pressure becomes equal to the atmospheric pressure, the amount of intake air is controlled on the basis of the operation angle. During this process, the degree of throttle opening is controlled so that the intake pipe pressure can be kept at the atmospheric pressure before and after the intake amount control based on the operation angle is performed. Therefore, fluctuations in the intake pipe pressure at the time of a change of the operation angle can be reduced or prevented, and the amount of intake air can be controlled with good precision. Thus, the torque shock can be reduced or prevented.

Control apparatus and method for internal combustion engine having variable valve system

A device for controlling an internal combustion engine with a variable valve timing system is provided. While the piston descends just after the combustion in the cylinder, the intake valve is opened by the variable valve system for the intake valve such that the intake air is supplied into the cylinder from the engine intake system.

Device for controlling an internal combustion engine with a variable valve timing system

When an internal combustion engine including an electromagnetic valve drive mechanism driving a plurality of valves is to be stopped, application of current to at least one magnet for one valve or valve group is stopped at a different timing from another valve or valve group.

Valve drive system and method

An apparatus is provided which includes an internal combustion engine of a lean-burn type, an NOx catalyst disposed in an exhaust passage of the engine so as to remove nitrogen oxides contained in exhaust gas emitted from the engine, and a variable valve control system capable of changing at least one of the opening and closing timing and a lift of the intake valve and/or the exhaust valve for each cylinder of the engine. The variable valve control system is controlled so that the exhaust gas to which the NOx catalyst is exposed is controlled so as to be suitable for removing a selected gaseous component from the NOx catalyst when the selected gaseous component should be removed. A method of purifying an exhaust gas emitted from the above engine is also provided.

Internal combustion engine having variable valve control system and NOx catalyst

An internal combustion engine having an electromagnetic valve driving mechanism adjusts an amount of magnetizing current to be applied to the electromagnetic valve driving mechanism in accordance with a temperature or viscosity of a lubricant used in the electromagnetic valve driving mechanism. Accordingly, intake and exhaust valves can be driven with an electromagnetic force corresponding to a viscosity of the lubricant. Therefore, changes in opening-and-closing operation speeds of the intake and exhaust valves resulting from a temperature or viscosity of the lubricant that is supplied to a sliding portion of the electromagnetic valve driving mechanism can be reduced.

Internal combustion engine having electromagnetic valve driving mechanism and method of controlling electromagnetic valve driving mechanism

An internal combustion engine includes two intake side solenoid driving valve mechanisms for opening and closing intake valves by cooperation of an electromagnetic coil and a spring, and/or two exhaust side solenoid driving valve mechanisms for opening and closing exhaust valves provided on each cylinder. A controller commands a driving circuit to cause the valve-opening timing of the exhaust valves or the intake valves to be different.

Growing community of inventors

Susono, Japan

Tomomi Yamada