Patents by Inventor Kazufumi KUMAKURA

Kazufumi KUMAKURA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Controller for multi-cylinder engine
    Patent number: 10612474
    Abstract: Disclosed is a control device for a multi-cylinder engine having a combustion chamber (19) to which an intake port (16) and an exhaust port (17) are connected. The control device comprises: an intake-side variable valve operating mechanism (71) for controlling a lift timing of two intake valves (21a, 21b) of the intake port (16); an exhaust-side variable valve operating mechanism (72) for controlling a lift timing of an exhaust valve (22a); and an exhaust-side valve operating mechanism (73) for driving an exhaust valve (22b) at a fixed timing. The control device is operable, when executing cylinder deactivation in a low engine load and low engine speed operating range, to cause the exhaust-side variable valve operating mechanism (72) to open the exhaust valve (22a) during downward movement of a piston (14) in a cylinder (18) being subjected to the cylinder deactivation.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: April 7, 2020
    Assignee: MAZDA MOTOR CORPORATION
    Inventors: Keitaro Ezumi, Kazuhiro Takemoto, Tomokuni Kusunoki, Atsushi Inoue, Akitomo Takagi, Masanari Sueoka, Masami Nishida, Kazufumi Kumakura, Kota Matsumoto, Tomohiro Hasegawa, Tadasu Hashiguchi, Toshiaki Takahashi, Masatoshi Hidaka
  • CONTROL DEVICE FOR MULTI-CYLINDER ENGINE
    Publication number: 20190101064
    Abstract: Disclosed is a control device for a multi-cylinder engine having a combustion chamber (19) to which an intake port (16) and an exhaust port (17) are connected. The control device comprises: an intake-side variable valve operating mechanism (71) for controlling a lift timing of two intake valves (21a, 21b) of the intake port (16); an exhaust-side variable valve operating mechanism (72) for controlling a lift timing of an exhaust valve (22a); and an exhaust-side valve operating mechanism (73) for driving an exhaust valve (22b) at a fixed timing. The control device is operable, when executing cylinder deactivation in a low engine load and low engine speed operating range, to cause the exhaust-side variable valve operating mechanism (72) to open the exhaust valve (22a) during downward movement of a piston (14) in a cylinder (18) being subjected to the cylinder deactivation.
    Type: Application
    Filed: March 29, 2017
    Publication date: April 4, 2019
    Applicant: MAZDA MOTOR CORPORATION
    Inventors: Keitaro EZUMI, Kazuhiro TAKEMOTO, Tomokuni KUSUNOKI, Atsushi INOUE, Akitomo TAKAGI, Masanari SUEOKA, Masami NISHIDA, Kazufumi KUMAKURA, Kota MATSUMOTO, Tomohiro HASEGAWA, Tadasu HASHIGUCHI, Toshiaki TAKAHASHI, Masatoshi HIDAKA