Abstract: Provided is an engine control device for controlling an opening degree of a valve adjusting a flow rate of an air-fuel mixture of an engine, wherein the opening degree is corrected based on an exhaust temperature deviation which is a deviation between a reference value and a current value of an exhaust temperature when controlling the opening degree.

Abstract: An internal combustion engine includes an internal combustion engine main body including a plurality of cylinders, a knock sensor provided on each of the plurality of cylinders, a control board including an amplification circuit, and a plurality of cables differing in length and each connecting the knock sensor and the control board. The amplification circuit includes, for each of the plurality of cables, a first charge amplifier connected to a first output terminal of the knock sensor via one of the plurality of cables, a second charge amplifier connected to a second output terminal of the knock sensor via one of the plurality of cables, and a differential amplifier configured to take an output of the first charge amplifier and an output of the second charge amplifier as input.

Abstract: An internal combustion engine includes an internal combustion engine main body including a plurality of cylinders, a knock sensor provided on each of the plurality of cylinders, a control board including an amplification circuit, and a plurality of cables differing in length and each connecting the knock sensor and the control board. The amplification circuit includes, for each of the plurality of cables, a first charge amplifier connected to a first output terminal of the knock sensor via one of the plurality of cables, a second charge amplifier connected to a second output terminal of the knock sensor via one of the plurality of cables, and a differential amplifier configured to take an output of the first charge amplifier and an output of the second charge amplifier as input.

Abstract: A control device (10) for a supercharging system for supplying compressed intake air to an engine (6) includes: an engine controller (10A) including an engine signal input part (10A1) and an engine control part (10A2) configured to control an operational state of the engine and to compute a target boost pressure of a supercharger (4); and a turbo controller (10B2) including a turbo signal input part (10B1) and a turbo control part (10B2) configured to compute a margin of the supercharger. The control device is configured to compute a target boost-pressure corrected value by correcting the target boost pressure in accordance with a magnitude of the margin computed by the turbo control part, and to control a boost-pressure control unit (12) so that the boost pressure of the supercharger reaches the target boost-pressure corrected value.

Abstract: A control device (10) for a supercharging system for supplying compressed intake air to an engine (2) includes: an engine controller (10A) including an engine-signal input part (10A1) and an engine control part (10B1) configured to control an operational state of the engine; and a turbo controller (10B) including a turbo-signal input part (10B1) and a turbo-control part (10B2) including a turbo-control-command-value computing part (10B2a) configured to compute a turbo control command value corresponding to a target boost pressure of the supercharger (3). The boost-pressure control unit is controlled so that a boost pressure of the supercharger reaches the target boost pressure through output of the turbo control command value computed by the turbo-control-command-value computing part to the boost-pressure control unit.

Abstract: Provided are a knocking determination device and a knocking control device for an internal combustion engine, with which a large amount of knocking can be detected quickly and with which knocking is easily determined. A knocking time window and a bandpass filter (BPF) are used (B1-B2) to extract a knocking frequency waveform signal from a knock sensor signal (Sg1), and integration is performed to obtain a first calculated value (B3). A reference time window and a BPF are used (B4-B5) to extract a reference frequency waveform signal from the knock sensor signal (Sg1), and integration is performed to obtain a second calculated value (B6). The average value of multiple instances of the second calculated value is obtained (B7), and the first calculated value is divided by the average value to obtain a signal-to-noise (S/N) ratio (B8).

Abstract: An object is to enable low fuel-consumption operation of an engine by controlling a back pressure and a power generation amount taking account of a trade-off relationship between deterioration of fuel efficiency due to an increase in pumping loss due to a back-pressure rise of the engine and improvement of fuel efficiency due to recovery of exhaust energy by a turbo compound.

Abstract: In embodiments, an exhaust gas purification apparatus and method for an internal combustion engine initializes a SCR catalyst by heating the SCR catalyst under predetermined conditions without accompanying troublesome procedures and complicated calculations. With the exhaust gas purification apparatus for an internal combustion engine, arranged on an exhaust-gas passage of the internal combustion engine and including the SCR catalyst for purifying NOx in exhaust gas in the internal combustion engine, the method calculates and accumulates estimated values of NH3 adsorption adsorbed on the SCR catalyst, on the basis of the amount of NH3 injection from urea-aqueous solution injected into the exhaust-gas passage from the upstream side of the SCR catalyst and the amount of NH3 injection for purifying NOx at the upstream side of the SCR catalyst, and initializing the SCR catalyst by heating the SCR catalyst to initialize the estimated value of NH3 adsorption.

Abstract: An exhaust gas purification system of engine configured to classify a PM accumulation state of DPF into multiple evaluation stages based on a plurality of evaluation indices, and to repeatedly perform determination of the current evaluation stage by the current stage determination part and determination of whether to move up the current evaluation stage to the evaluation stage of the next rank by the evaluation stage determination part, wherein upon a defect of a sensor among different types of sensors being detected by the defect detection part, the current evaluation stage is newly redetermined by the current stage redetermination part as substituted for the current evaluation stage determined by the current stage determination part.

Abstract: The present invention relates to a control unit of an internal combustion engine capable of performing a coordinate control of an exhaust gas recirculation (hereinafter abbreviated as “EGR”) gas supply amount by an EGR apparatus and a supercharging amount by a supercharger provided with a variable flow mechanism. The control unit comprises: a state quantity estimation section for calculating an in-cylinder oxygen excess ratio based on an operating state of the internal combustion engine; and a switching part for switching the respective opening degree commands for the EGR valve and the variable flow mechanism of the supercharger so that the opening degree of the EGR valve and the opening degree of the variable flow mechanism become smaller than in a normal state when the internal combustion engine is determined to be in the transient state based on the calculated in-cylinder oxygen excess ratio.

Abstract: A control device of a control valve used for an intake air-gas system of an engine. The device includes, but is not limited to: the control valve which is an intake air throttle valve provided in the intake air-gas system provided in the intake air-gas system of the engine to control the flow rate of intake air to the engine, or an EGR valve provided in the intake air-gas system of the engine to control the flow rate of EGR gas to the engine; and a control unit which determines a target opening of the control valve in response to the operation conditions of the engine, and controls the opening of the control valve so that the opening conforms with the target opening.

Abstract: Provided are a knocking determination device and a knocking control device for an internal combustion engine, with which a large amount of knocking can be detected quickly and with which knocking is easily determined. A knocking time window and a bandpass filter (BPF) are used (B1-B2) to extract a knocking frequency waveform signal from a knock sensor signal (Sg1), and integration is performed to obtain a first calculated value (B3). A reference time window and a BPF are used (B4-B5) to extract a reference frequency waveform signal from the knock sensor signal (Sg1), and integration is performed to obtain a second calculated value (B6). The average value of multiple instances of the second calculated value is obtained (B7), and the first calculated value is divided by the average value to obtain a signal-to-noise (S/N) ratio (B8).

Abstract: A control device (10) for a supercharging system for supplying compressed intake air to an engine (6) includes: an engine controller (10A) including an engine signal input part (10A1) and an engine control part (10A2) configured to control an operational state of the engine and to compute a target boost pressure of a supercharger (4); and a turbo controller (10B2) including a turbo signal input part (10B1) and a turbo control part (10B2) configured to compute a margin of the supercharger. The control device is configured to compute a target boost-pressure corrected value by correcting the target boost pressure in accordance with a magnitude of the margin computed by the turbo control part, and to control a boost-pressure control unit (12) so that the boost pressure of the supercharger reaches the target boost-pressure corrected value.

Abstract: A control device (10) for a supercharging system for supplying compressed intake air to an engine (2) includes: an engine controller (10A) including an engine-signal input part (10A1) and an engine control part (10B1) configured to control an operational state of the engine; and a turbo controller (10B) including a turbo-signal input part (10B1) and a turbo-control part (10B2) including a turbo-control-command-value computing part (10B2a) configured to compute a turbo control command value corresponding to a target boost pressure of the supercharger (3). The boost-pressure control unit is controlled so that a boost pressure of the supercharger reaches the target boost pressure through output of the turbo control command value computed by the turbo-control-command-value computing part to the boost-pressure control unit.

Abstract: An object is to enable low fuel-consumption operation of an engine by controlling a back pressure and a power generation amount taking account of a trade-off relationship between deterioration of fuel efficiency due to an increase in pumping loss due to a back-pressure rise of the engine and improvement of fuel efficiency due to recovery of exhaust energy by a turbo compound.

Abstract: An object is to provide a diesel engine control apparatus configured to evaluate the activation state of a SCR catalyst at high accuracy by means other than the temperature of the catalyst and to control engine control parameters so as to reduce the amount of NOx emission when the SCR catalyst is in a non-active state. The diesel engine control apparatus includes a diesel engine, an engine control unit, and an SCR catalyst. The engine control unit includes a parameter setting part configured to set engine control parameters; an operation control part configured to control an operation state of the diesel engine on the basis of the at least one engine control parameter; and a purification state determination part configured to determine a NOx purification state of the SCR catalyst.

Abstract: An objection is to provide exhaust gas purification apparatus and method for an internal combustion engine, which can initialize a SCR catalyst by heating the SCR catalyst under predetermined conditions without accompanying troublesome procedures and complicated calculations.

Abstract: An object is to provide a diesel engine control apparatus configured to evaluate the activation state of a SCR catalyst at high accuracy by means other than the temperature of the catalyst and to control engine control parameters so as to reduce the amount of NOx emission when the SCR catalyst is in a non-active state. The diesel engine control apparatus includes a diesel engine, an engine control unit, and an SCR catalyst. The engine control unit includes a parameter setting part configured to set engine control parameters; an operation control part configured to control an operation state of the diesel engine on the basis of the at least one engine control parameter; and a purification state determination part configured to determine a NOx purification state of the SCR catalyst.

Abstract: A PM accumulation amount estimation unit 50 is provided with an exhaust amount computation unit 51 for computing PM exhaust amount which is discharged in an exhaust gas passage 3, and a passive regeneration amount computation unit 52 for computing a PM regeneration amount in a DPF 7, and is configured to estimate the PM accumulation amount in the DPF 7 from the difference between the PM exhaust amount computed by the exhaust amount computation unit 51 and the PM regeneration amount computed by the passive regeneration amount computation unit 52. The PM accumulation amount estimation unit 50 is further configured such that, when an abnormality is found in an airflow meter 31, the PM regeneration amount from NO2 is computed, and the PM accumulation amount in the DPF is estimated, without using the airflow amount measured by the airflow meter 31.

Abstract: An exhaust gas emission control system for a diesel engine, having an oxidation catalyst (DOC) (7) and a diesel particulate filter (DPF) (9) in an exhaust passage, wherein a late post-injection control unit (62), which injects fuel into a combustion chamber at a timing not contributing to combustion in DPF regeneration control, feedback controls a late post-injection amount such that a regeneration amount of soot regenerated by the DPF (9) becomes a target soot regeneration amount per unit time.