公开(公告)号：US20200370499A1

公开(公告)日：2020-11-26

申请号：US16811199

申请日：2020-03-06

Applicant: Mazda Motor Corporation

Inventor： Kazuhiro TAKEMOTO ,  Michio ITO ,  Masanari SUEOKA ,  Kazuhiro NISHIMURA ,  Kouji HADAMA ,  Masataka SUMITA ,  Masami NISHIDA

IPC: F02D41/38 ,  F02D41/14

Abstract: A controller for controlling a fuel injection valve and a fuel pressure adjustment mechanism sets an air-fuel ratio of a fuel-air mixture to be generated within a combustion chamber to be equal to or leaner than a theoretical air-fuel ratio, based on an operating condition of an engine; drives the fuel injection valve, based on the set air-fuel ratio; estimates a deposition amount of deposits on an injection hole of the fuel injection valve, based on an operating condition of the engine; causes the fuel pressure adjustment mechanism to increase the fuel pressure, when the estimated deposition amount of deposits exceeds a predetermined value; and restricts the fuel pressure from increasing, even when the estimated deposition amount of deposits exceeds the predetermined value, as long as the fuel-air ratio is set to an air-fuel ratio leaner than the theoretical fuel-air ratio.

公开(公告)号：US20200370500A1

公开(公告)日：2020-11-26

申请号：US16811142

申请日：2020-03-06

Applicant: Mazda Motor Corporation

Inventor： Kazuhiro TAKEMOTO ,  Michio ITO ,  Masanari SUEOKA ,  Kazuhiro NISHIMURA ,  Kouji HADAMA ,  Masataka SUMITA ,  Masami NISHIDA

IPC: F02D41/40 ,  F02F3/28 ,  F02M59/20 ,  F02B77/04

Abstract: A controller for controlling a fuel injection valve and a fuel pressure adjustment mechanism integrates a deposition amount of deposits per unit time, and estimates a deposition amount of deposits on an injection hole of the fuel injection valve. The controller causes the fuel pressure adjustment mechanism to increase a fuel pressure, when the estimated deposition amount exceeds a predetermined value, and corrects the unit deposition amount acquired by the deposition amount estimation according to the set fuel injection timing of the fuel injection valve. The controller corrects such that as compared with the unit deposition amount when the fuel injection timing is set to a first timing away from a top dead center of the piston by a first period, the unit deposition amount decreases when the fuel injection timing is set to a second timing away by a second period longer than the first period.

公开(公告)号：US20190101064A1

公开(公告)日：2019-04-04

申请号：US16086520

申请日：2017-03-29

Applicant: MAZDA MOTOR CORPORATION

Inventor： 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

IPC: F02D13/02 ,  F01L9/02 ,  F02D13/06 ,  F01L1/344 ,  F02D41/00

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.