Other

Hitachi, Ltd.

Hitachi Car Engineering Co., Ltd.

Yasuyuki Nakano

Masayuki Suganami

Youichi Watanabe

Kzunori Irifune

Teruhiko Minegishi

An object of the present invention is to provide an exhaust gas recirculation device with an improved response speed and accuracy of exhaust gas recirculation flow control in an internal combustion engine. A recirculation gas control valve controls a recirculation flow rate in exhaust gas recirculation passages of the internal combustion engine. An air intake control valve controls a flow rate in an intake passage of the internal combustion engine. An intake airflow sensor detects a flow rate in the intake passage. A recirculation flow sensor detects an exhaust gas recirculation flow rate in the exhaust gas recirculation passage. An exhaust gas recirculation controller performs feedback control of the intake air control valve and/or the recirculation gas control valve so that the exhaust gas recirculation ratio obtained based on outputs of the intake airflow sensor and the recirculation flow sensor is a target ratio recirculation ratio.

Exhaust gas recirculation device for internal combustion engine

Disclosed is a motor-operated flow control valve for internal combustion engines which has a longer useful life and does not cause a drop of torque generated by a motor at the start-up. A rotor shaft ( ) is reciprocated with rotating motion of a motor ( ), whereupon a valve head ( ) is moved to open and close an orifice for control of a flow rate. Specific frequency of a rotor unit ( ) of the motor ( ) is set to be higher than the secondary vibration frequency of rotation of a 4-cycle internal combustion engine. The rotor unit ( ) comprises an integral magnet ( ), a single ball bearing ( ) and a resin-made magnet holder ( ) for supporting these two members, the magnet, the ball bearing and the magnet holder being formed into an integral structure. The rotor unit is supported such that an outer race ( ) of the ball bearing ( ) is held at its one end against an inner peripheral wall of a housing resin ( ) and a preload is applied to the other end of the outer race ( ).

Motor-operated flow control valve and exhaust gas recirculation control valve for internal combustion engine

Disclosed is a motor-operated flow control valve for internal combustion engines which has a longer useful life and does not cause a drop of torque generated by a motor at the start-up. A rotor shaft (,) is reciprocated with rotating motion of a motor (,), whereupon a valve head (,) is moved to open and close an orifice for control of a flow rate. Specific frequency of a rotor unit (,) of the motor (,) is set to be higher than the secondary vibration frequency of rotation of a 4-cycle internal combustion engine. The rotor unit (,) comprises an integral magnet (,), a single ball bearing (,) and a resin-made magnet holder (,) for supporting these two members, the magnet, the ball bearing and the magnet holder being formed into an integral structure. The rotor unit is supported such that an outer race (,) of the ball bearing (,) is held at its one end against an inner peripheral wall of a housing resin (,) and a preload is applied to the other end of the outer race (,).

Motor-operated flow control valve and gas recirculation control valve for internal combustion engine

Disclosed is a motor-operated flow control valve for internal combustion engines which has a longer useful life and does not cause a drop of torque generated by a motor at the start-up. A rotor shaft (9) is reciprocated with rotating motion of a motor (32), whereupon a valve head (2a) is moved to open and close an orifice for control of a flow rate. Specific frequency of a rotor unit (33) of the motor (32) is set to be higher than the secondary vibration frequency of rotation of a 4-cycle internal combustion engine. The rotor unit (33) comprises an integral magnet (25), a single ball bearing (27) and a resin-made magnet holder (26) for supporting these two members, the magnet, the ball bearing and the magnet holder being formed into an integral structure. The rotor unit is supported such that an outer race (27c) of the ball bearing (27) is held at its one end against an inner peripheral wall of a housing resin (14) and a preload is applied to the other end of the outer race (27c).

Growing community of inventors

Ibaraki-ken, Japan

Yasuyuki Nakano