Abstract: A control device for an internal-combustion engine, includes: an ejector including an exhaust port coupled to an intake passage upstream of a compressor, an intake port coupled to a recirculation passage recirculating intake air from the intake passage downstream of the compressor to the intake passage upstream of the compressor, and a suction port coupled to a first branch passage; a first pressure acquirer obtaining a first pressure that is a pressure upstream of the compressor in the intake passage; a second pressure acquirer obtaining a second pressure that is a pressure downstream of the compressor in the intake passage; and an ejector negative pressure estimator configured to estimate an ejector negative pressure based on an opening period of the purge valve and the second pressure.

Abstract: A controller of a control device of an internal combustion engine includes: a storage configured to store fuel pressure detected during injection of one port injection valve of port injection valves in association with another port injection valve, of the port injection valves, scheduled to inject fuel after one or two cycles of the fuel pressure pulsation elapsing from injection of the one port injection valve; and a calculator configured to calculate an energization period of the another port injection valve based on the stored fuel pressure.

Abstract: A control device for an internal-combustion engine, includes: an ejector including an exhaust port coupled to an intake passage upstream of a compressor, an intake port coupled to a recirculation passage recirculating intake air from the intake passage downstream of the compressor to the intake passage upstream of the compressor, and a suction port coupled to a first branch passage; a first pressure acquirer obtaining a first pressure that is a pressure upstream of the compressor in the intake passage; a second pressure acquirer obtaining a second pressure that is a pressure downstream of the compressor in the intake passage; and an ejector negative pressure estimator configured to estimate an ejector negative pressure based on an opening period of the purge valve and the second pressure.

Abstract: A control system of an internal combustion engine includes an electronic control unit. The electronic control unit is configured to: (i) obtain a detection value of a fuel pressure sensor at fixed sampling time intervals; (ii) calculate a center fuel pressure value of a pulsation of the fuel pressure, based on at least a first latest fuel pressure value and a second latest fuel pressure value as detection values of the fuel pressure sensor, (iii) calculate an amplitude of the pulsation of the fuel pressure, based on at least the second latest fuel pressure value and the first latest fuel pressure value; (iv) calculate an initial phase of the pulsation of the fuel pressure, based on at least one of the second latest fuel pressure value and the first latest fuel pressure value, and (v) predict a fuel pressure value corresponding to the crank angle, based on a predetermined formula.

Abstract: A control device for an internal combustion engine is equipped with an electronic control unit. The electronic control unit is configured to: i) calculate amplitudes of respective waves, respectively, originating from a plurality of factors that causes fuel pressure pulsation within a low-pressure fuel passage, vibration frequencies of the respective waves within a crank angle range of 360 degrees, initial phases of the respective waves, and central fuel pressure values of the respective waves; and ii) predict a fuel pressure value at an arbitrary crank angle according to a model formula showing a synthesized wave obtained by synthesizing the respective waves, on a basis of the amplitudes, the vibration frequencies, the initial phases, and the central fuel pressure values of the respective waves calculated.

Abstract: A controller of a control device of an internal combustion engine includes: a storage configured to store fuel pressure detected during injection of one port injection valve of port injection valves in association with another port injection valve, of the port injection valves, scheduled to inject fuel after one or two cycles of the fuel pressure pulsation elapsing from injection of the one port injection valve; and a calculator configured to calculate an energization period of the another port injection valve based on the stored fuel pressure.

Abstract: A control system of an internal combustion engine includes a port injection valve and an electronic control unit. The electronic control unit is configured to: (i) obtain one of a start crank angle and an end crank angle, (ii) calculate the other of the start crank angle and the end crank angle, based on an equation for calculating a provisional injection amount of the case where the port injection valve provisionally injects the fuel with the one of the start crank angle and the end crank angle and a given crank angle range; (iii) convert a crank angle range from the start crank angle to the end crank angle, into a target energization period; and (iv) perform fuel injection by energizing the port injection valve for the target energization period.

Abstract: A control system of an internal combustion engine includes a port injection valve and an electronic control unit. The electronic control unit is configured to: (i) obtain one of a start crank angle and an end crank angle, (ii) calculate the other of the start crank angle and the end crank angle, based on an equation for calculating a provisional injection amount of the case where the port injection valve provisionally injects the fuel with the one of the start crank angle and the end crank angle and a given crank angle range; (iii) convert a crank angle range from the start crank angle to the end crank angle, into a target energization period; and (iv) perform fuel injection by energizing the port injection valve for the target energization period.

Abstract: A control device for an internal combustion engine is equipped with an electronic control unit. The electronic control unit is configured to: i) calculate amplitudes of respective waves, respectively, originating from a plurality of factors that causes fuel pressure pulsation within a low-pressure fuel passage, vibration frequencies of the respective waves within a crank angle range of 360 degrees, initial phases of the respective waves, and central fuel pressure values of the respective waves; and ii) predict a fuel pressure value at an arbitrary crank angle according to a model formula showing a synthesized wave obtained by synthesizing the respective waves, on a basis of the amplitudes, the vibration frequencies, the initial phases, and the central fuel pressure values of the respective waves calculated.

Abstract: A control system of an internal combustion engine includes an electronic control unit. The electronic control unit is configured to: (i) obtain a detection value of a fuel pressure sensor at fixed sampling time intervals; (ii) calculate a center fuel pressure value of a pulsation of the fuel pressure, based on at least a first latest fuel pressure value and a second latest fuel pressure value as detection values of the fuel pressure sensor, (iii) calculate an amplitude of the pulsation of the fuel pressure, based on at least the second latest fuel pressure value and the first latest fuel pressure value; (iv) calculate an initial phase of the pulsation of the fuel pressure, based on at least one of the second latest fuel pressure value and the first latest fuel pressure value, and (v) predict a fuel pressure value corresponding to the crank angle, based on a predetermined formula.