Abstract: The error diagnosis device has: an input unit that receives a downstream pressure value and an upstream pressure value, said downstream pressure value being detected on the downstream side of a fuel pump and said upstream pressure value being detected on the upstream side of the fuel pump; and a determination unit that, if the downstream pressure value is less than a preset first threshold value, determines whether or not the upstream pressure value is less than a preset second threshold value. The determination unit determines that an error has occurred further upstream than the fuel pump if the upstream pressure value is less than the second threshold value and determines that an error has occurred in the fuel pump if the upstream pressure value is at least the second threshold value.

Abstract: This failure determining device is provided with a first determining unit which refers to correction amount data indicating a correction amount relating to operation of a part related to an internal combustion engine, to determine whether there is a possibility that the internal combustion engine has failed, a data acquiring unit which, if it has been determined that there is a possibility that the internal combustion engine has failed, acquires influencing factor data indicating a factor influencing the correction amount, and a second determining unit which refers to the correction amount data together with the acquired influencing factor data to determine whether the internal combustion engine has failed.

Abstract: The error diagnosis device has: an input unit that receives detected values for pressure inside the common rail; a calculation unit that, if the detected values are less than a target common rail pressure, calculates the pressure differences and the fuel pump discharge amounts; and a determination unit that determines whether or not a set time has lapsed in a state in which the pressure differences are at least a first threshold value and less than a second threshold value and the discharge amounts are at least a third threshold value and less than a fourth threshold value. The determination unit determines that an error has occurred in the high-pressure pump if the set time has lapsed and determines that an error has occurred in the flowrate adjustment valve if the set time has not lapsed.

Abstract: The error diagnosis device has: an input unit that receives detected values for pressure inside the common rail; a calculation unit that, if the detected values are less than a target common rail pressure, calculates the pressure differences and the fuel pump discharge amounts, and a determination unit that determines whether or not a set time has lapsed in a slate in which the pressure differences are at least a first threshold value and less than a second threshold value and the discharge amounts are at least a third threshold value and less than a fourth threshold value. The determination unit determines that an error has occurred in the high-pressure pump if the set time has lapsed and determines that an error has occurred in the flowrate adjustment valve if the set time has not lapsed.

Abstract: This failure determining device is provided with a first determining unit which refers to correction amount data indicating a correction amount relating to operation of a part related to an internal combustion engine, to determine whether there is a possibility that the internal combustion engine has failed, a data acquiring unit which, if it has been determined that there is a possibility that the internal combustion engine has failed, acquires influencing factor data indicating a factor influencing the correction amount, and a second determining unit which refers to the correction amount data together with the acquired influencing factor data to determine whether the internal combustion engine has failed.

Abstract: The error diagnosis device has: an input unit that receives a downstream pressure value and an upstream pressure value, said downstream pressure value being detected on the downstream side of a fuel pump and said upstream pressure value being detected on the upstream side of the fuel pump; and a determination unit that, if the downstream pressure value is less than a preset first threshold value, determines whether or not the upstream pressure value is less than a preset second threshold value.

Abstract: An abnormality detection device includes: an opening degree acquisition unit, which acquires a plurality of opening degree data indicating an opening degree of a valve provided in a vehicle, the opening degree being measured during a certain period; an integration unit, which calculates an integrated value of a plurality of differences by integrating the plurality of differences between a plurality of opening degree actual measurement values indicated by the plurality of opening degree data acquired by the opening degree acquisition unit and an opening degree target value of the valve; and a determination unit, which determines that there is an abnormality in the vehicle when the integrated value integrated by the integration unit is higher than a certain value.

Abstract: An abnormality detection device includes: an opening degree acquisition unit, which acquires a plurality of opening degree data indicating an opening degree of a valve provided in a vehicle, the opening degree being measured during a certain period; an integration unit, which calculates an integrated value of a plurality of differences by integrating the plurality of differences between a plurality of opening degree actual measurement values indicated by the plurality of opening degree data acquired by the opening degree acquisition unit and an opening degree target value of the valve; and a determination unit, which determines that there is an abnormality in the vehicle when the integrated value integrated by the integration unit is higher than a certain value.

Abstract: An abnormality detection device includes an intake amount acquisition unit, which acquires intake amount data indicating an intake amount when an EGR valve is being in a certain state, the intake amount being measured at a plurality of different times, a storage unit, which stores a plurality of the intake amount data acquired by the intake amount acquisition unit, in association with a time at which the intake amount is measured, and an abnormality detection unit, which detects an abnormality of the EGR valve based on a changing tendency of a plurality of the intake amounts measured during a certain period.

Abstract: A device for a common rail diesel engine can control an engine phase when the engine is stopped so the engine can be restarted quickly. An engine phase determining means determines an engine phase based on a crank angle and an angle of a camshaft, an engine stop position determining means stores a stopping time spent from the issuance of an engine stop request to the stop of the engine and obtains an engine phase when the engine is stopped based on the engine phase, resulting when the engine stop is requested, and the stopping time, and an at-time-of-stopping injector control means controls fuel injected from the fuel injectors so the engine phase obtained by the engine stop position determining means when the engine is stopped after making the engine stop request allows a piston in a specific cylinder to stop at a bottom dead center of a compression stroke.

Abstract: A device for a common rail diesel engine can control an engine phase when the engine is stopped so the engine can be restarted quickly. An engine phase determining means determines an engine phase based on a crank angle and an angle of a camshaft, an engine stop position determining means stores a stopping time spent from the issuance of an engine stop request to the stop of the engine and obtains an engine phase when the engine is stopped based on the engine phase, resulting when the engine stop is requested, and the stopping time, and an at-time-of-stopping injector control means controls fuel injected from the fuel injectors so the engine phase obtained by the engine stop position determining means when the engine is stopped after making the engine stop request allows a piston in a specific cylinder to stop at a bottom dead center of a compression stroke.

Abstract: On stopping a diesel engine, an amount of fuel injected on engine-stop control is made reduced slowly after the engine is manipulated to be stopped, thereby suppressing vibration or shock, which might otherwise occur owing to sudden engine stall. With an ignition key as an operating means turned off, an engine control mode enters a mode of beginning the engine-stop control, where an amount of fuel injected on the engine-stop control is selected to reduce slowly with a time that has elapsed since the ignition was off. Thus, the engine is less subject to sudden stall and kept from vibration and shock resulting from the engine-stop. The instant the engine rpm Ne lowers below a preset engine rpm Ne1, an intake-throttle valve control mode starts to throttle an amount of admitted air correspondingly to the reduction of the amount of fuel injected on the engine-stop control, thereby eliminating undesirable burning owing to undue excess-air factor.