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公开(公告)号：US10436132B2
公开(公告)日：2019-10-08
申请号：US15830362
申请日：2017-12-04
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Eiji Yamada , Keisuke Nagakura
Abstract: An engine system includes: an engine including a plurality of cylinders; an EGR passage including EGR branch passages each configured to recirculate part of exhaust gas into an intake port of a corresponding one of the plurality of cylinders; an EGR valve configured to be capable of adjusting an EGR flow rate; and an ECU configured to control the EGR valve. When an engine rotation fluctuation amount in an EGR OFF state is less than a first determination value, and when the engine rotation fluctuation amount in an EGR ON state is greater than a second determination value, the ECU imposes an EGR restriction for restricting the EGR flow rate. When it is determined that the engine rotation fluctuation amount in the EGR ON state is greater than a third determination value less than the second determination value after the EGR restriction is imposed, the ECU continues the EGR restriction.
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公开(公告)号：US09982618B2
公开(公告)日：2018-05-29
申请号：US14849873
申请日：2015-09-10
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Takashi Suzuki , Tomoya Suzuki , Keisuke Nagakura
CPC classification number: F02D41/222 , F02D41/061 , F02D41/08 , F02D41/3082 , F02D41/3094 , F02D2041/223 , F02D2041/227 , F02D2041/3881 , F02D2250/04 , F02D2250/31 , F02M63/0225
Abstract: An engine includes a low-pressure delivery pipe that stores fuel to be injected from port injection valves, a feed pump that supplies the fuel to the low-pressure delivery pipe, a high-pressure delivery pipe that stores the fuel to be injected from in-cylinder injection valves, a high-pressure pump driven in response to rotation of the engine, and a fuel pressure sensor that detects a pressure of the fuel stored in the low-pressure delivery pipe. An engine ECU controls the feed pump based on a detection value from a fuel pressure sensor, and when the engine ECU executes an abnormality diagnosis of the fuel pressure sensor, the engine ECU increases a rotational speed of the engine to be higher than a rotational speed when the engine ECU does not execute an abnormality diagnosis of the fuel pressure sensor. This improves the accuracy of an abnormality determination of the fuel pressure sensor.
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3.发明授权公开(公告)号：US10760535B2
公开(公告)日：2020-09-01
申请号：US16212827
申请日：2018-12-07
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Keisuke Nagakura , Eiji Yamada
Abstract: A control device for an internal combustion engine is disclosed. The internal combustion engine includes a plurality of cylinders, a fuel injection valve configured to supply fuel to each cylinder, an EGR passage configured to connect an exhaust passage and an intake passage, an EGR valve configured to adjust a flow rate of exhaust gas flowing from the exhaust passage into the intake passage through the EGR passage, and an air-fuel ratio sensor provided in the exhaust passage. The control device includes an electronic control unit configured to execute determination processing for determining that a degree of imbalance abnormality is greater when a fluctuation amount of a detection value of the air-fuel ratio sensor is relatively large than when the fluctuation amount is relatively small.
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Patent Agency Ranking
公开(公告)号：US10655555B2
公开(公告)日：2020-05-19
申请号：US15869222
申请日：2018-01-12
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Keisuke Nagakura
Abstract: An engine system includes: an engine including a direct injection valve that injects fuel into a cylinder of the engine and a port injection valve that injects fuel into an intake port of the engine; and an electronic control unit configured to control an operation of the engine by adjusting, based on a state of the engine, a rate of fuel injection from the direct injection valve with respect to total fuel injection and a rate of fuel injection from the port injection valve with respect to the total fuel injection. The electronic control unit executes a malfunction diagnosis with the rate of fuel injection from the direct injection valve set to 100%, when the electronic control unit determines that an execution condition for executing the malfunction diagnosis on a fuel system is satisfied and a power required of the engine is equal to or greater than a prescribed power.
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公开(公告)号：US12188424B2
公开(公告)日：2025-01-07
申请号：US18410160
申请日：2024-01-11
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Keisuke Nagakura
Abstract: An exhaust gas control apparatus removal determination device that performs an exhaust gas control apparatus removal determination processing based on a change in temperature of exhaust gas flowing into an exhaust gas control apparatus provided in an exhaust path of an engine and a change in temperature of exhaust gas flowing out. The controller determines whether the first state in which the difference between the measured value and the estimated value of the engine output is greater than or equal to a predetermined value continues for a predetermined time or longer, and determines that the engine output is in the first state. If it is determined, execution of the removal determination processing is prohibited.
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公开(公告)号：US10508609B2
公开(公告)日：2019-12-17
申请号：US15690876
申请日：2017-08-30
Inventor： Keisuke Nagakura , Jun Hattori
Abstract: When imbalance diagnosis is not executed, target fuel pressure is set based on a rotation speed and volumetric efficiency of an engine, and when the imbalance diagnosis is executed, fuel pressure smaller than the target fuel pressure settable when the imbalance diagnosis is not executed is set as the target fuel pressure, and a high-pressure fuel pump that supplies fuel to a delivery pipe connected to the in-cylinder injection valve, is driven and controlled such that detected fuel pressure becomes the target fuel pressure. With this, it is possible to execute the imbalance diagnosis with higher accuracy.
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公开(公告)号：US09664166B2
公开(公告)日：2017-05-30
申请号：US14818377
申请日：2015-08-05
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Keisuke Nagakura , Toshitake Sasaki , Kazuya Miyaji , Takashi Suzuki
CPC classification number: F02M59/20 , F02D41/042 , F02D41/062 , F02D41/222 , F02D41/3094 , F02D41/3854 , F02D2041/223 , F02D2041/3881 , F02D2200/0602
Abstract: An internal combustion engine includes a port injection valve and a feed pump that pressurizes the fuel. An engine ECU performs a stuck abnormality diagnosis of the fuel pressure sensor based on detection values of the fuel pressure sensor in first processing and second processing. The first processing includes setting a target pressure of the fuel in the storage section to a first pressure, and detecting a pressure of the fuel with the fuel pressure sensor. The second processing includes setting the target pressure of the fuel in a low-pressure delivery pipe to a second pressure lower than the first pressure, and detecting a pressure of the fuel. The engine ECU causes the first processing to be performed in response to a start signal that starts an internal combustion engine, and causes the second processing to be performed subsequent to the first processing.
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8.发明授权公开(公告)号：US10982628B2
公开(公告)日：2021-04-20
申请号：US16215326
申请日：2018-12-10
Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
Inventor： Keisuke Nagakura , Kuniyuki Sasaki
Abstract: A controller for an internal combustion engine including a plurality of cylinders, a fuel injection valve for supplying a fuel to each cylinder, an EGR passage connecting an exhaust passage and an intake passage, and an EGR valve adjusting a flow rate of exhaust flowing into the intake passage from the exhaust passage via the EGR passage, the controller includes an electronic control unit. The electronic control unit is configured to execute determination processing for determining that a degree of an imbalance abnormality is larger when a torque fluctuation amount is relatively large than when the torque fluctuation amount is relatively small.
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