Operating state determination device for engine, vehicle, operating state determination method for engine

Patent metadata

Field	Value
Publication number	US-2022106918-A1
Application number	US-201917420615-A
Country	US
Kind code	A1
Filing date	Jan 15, 2019
Priority date	Jan 15, 2019
Publication date	Apr 7, 2022
Grant date	—

Abstract

A temporal change of a turbo rotation speed of a turbocharger is detected for each cycle of an engine. A first vibration component corresponding to each of cylinders is specified from a pulsation component included in the temporal change of the turbo rotation speed, and the first vibration components for each of the cylinders are integrated over a plurality of cycles. A variation of combustion states in the plurality of cylinders is calculated by comparing integration results among the cylinders.

First claim

1 - 13 . (canceled)

14 . An operating state determination device for an engine mounted with a turbocharger and including a plurality of cylinders, the device comprising:
a turbo rotation speed detection part for detecting a temporal change of a turbo rotation speed of the turbocharger, for each cycle of the engine; a first vibration component specification part for specifying a first vibration component corresponding to each of the cylinders from a pulsation component included in the temporal change of the turbo rotation speed; a first integration part for integrating the first vibration components for each of the cylinders over a plurality of cycles of the engine; and a first variation calculation part for calculating a variation of combustion states in the plurality of cylinders by comparing integration results of the first integration part among the cylinders, wherein the first vibration component specification part specifies the first vibration component based on a temporally increasing region of the pulsation component.

15 . The operating state determination device for the engine according to claim 14 ,
wherein the region is an amplitude difference between a minimum value and a maximum value of the pulsation component, the maximum value being temporally delayed from the minimum value and being the earliest.

16 . The operating state determination device for the engine according to claim 14 ,
wherein the first integration part integrates the first vibration components on which a normalization process regarding an operating state of the engine is performed.

17 . The operating state determination device for the engine according to claim 14 ,
wherein, if the pulsation component has an amplitude of not greater than a predetermined value, a process is prohibited.

18 . The operating state determination device for the engine according to claim 14 ,
wherein the first vibration component specification part associates the first vibration component included in the temporal change of the turbo rotation speed with each of the cylinders, based on a reference signal synchronized with a rotation state of a crank shaft.

19 . The operating state determination device for the engine according to claim 14 , comprising a first determination part for determining presence or absence of an abnormality in the engine based on a calculation result of the first variation calculation part.

20 . The operating state determination device for the engine according to claim 19 ,
wherein the first variation calculation part calculates, as the variation, a variance value regarding the integration results of the first vibration components corresponding to the respective cylinders, and wherein the first determination part determines that the engine has the abnormality, if the variance value is not less than a first threshold.

21 . The operating state determination device for the engine according to claim 19 ,
wherein the first variation calculation part calculates, as the variation, a difference from an average value of the integration results of the first vibration components corresponding to the respective cylinders, and wherein the first determination part determines that there is the abnormality in the cylinders having the difference of not less than a second threshold.

22 . The operating state determination device for the engine according to claim 19 , further comprising:
a correction control instruction part for instructing to perform correction control on an operation parameter of the engine, if the first determination part determines that the engine has the abnormality, wherein, if the correction control is performed not less than a predetermined number of times, the first determination part determines that the engine has the abnormality, regardless of the calculation result of the first variation calculation part.

23 . The operating state determination device for the engine according to claim 14 , further comprising:
a rank specification part for specifying a rank of the first vibration component for each of the cylinders included in the temporal change of the turbo rotation speed, for each cycle of the engine, wherein the first integration part integrates the ranks for each of the cylinders over the plurality of cycles of the engine.

24 . The operating state determination device for the engine according to claim 23 ,
wherein an average value of the ranks for each of the cylinders is calculated, and based on whether the average value of each of the cylinders falls within a predetermined range, presence or absence of an abnormality in the engine is determined.

25 . An operating state determination device for an engine mounted with a turbocharger and including a plurality of cylinders, the device comprising:
a turbo rotation speed detection part for detecting a temporal change of a turbo rotation speed of the turbocharger, for each cycle of the engine; a first vibration component specification part for specifying a first vibration component corresponding to each of the cylinders from a pulsation component included in the temporal change of the turbo rotation speed; a first integration part for integrating the first vibration components for each of the cylinders over a plurality of cycles of the engine; and a first variation calculation part for calculating a variation of combustion states in the plurality of cylinders by comparing integration results of the first integration part among the cylinders; and a rank specification part for specifying a rank of the first vibration component for each of the cylinders included in the temporal change of the turbo rotation speed, for each cycle of the engine, wherein the first integration part integrates the ranks for each of the cylinders over the plurality of cycles of the engine.

26 . The operating state determination device for the engine according to claim 14 , further comprising:
an engine rotation speed detection part for detecting a temporal change of an engine rotation speed of the engine, for each cycle of the engine; a second vibration component specification part for specifying a second vibration component corresponding to each of the cylinders from a pulsation component included in the temporal change of the engine rotation speed; a second integration part for integrating the second vibration components for each of the cylinders over the plurality of cycles of the engine; a second variation calculation part for calculating a variation of combustion states in the plurality of cylinders by comparing integration results of the second integration part among the cylinders; and a third determination part for determining an operating state of the engine based on a calculation result of the first variation calculation part and a calculation result of the second variation calculation part.

27 . A vehicle, comprising:
the operating state determination device according to claim 14 ; and a vehicle control unit for controlling the engine based on a determination result of the operating state determination device.

28 . An operating state determination method for an engine mounted with a turbocharger and including a plurality of cylinders, the method comprising:
a step of detecting a temporal change of a turbo rotation speed of the turbocharger, for each cycle of the engine; a step of specifying a first vibration component corresponding to each of the cylinders from a pulsation component included in the temporal change of the turbo rotation speed; a step of integrating the first vibration components for each of the cylinders o

Assignees

• Mitsubishi Heavy Ind Engine & Turbocharger Ltd

Inventors

• Sase Ryo
• Noguchi Shintarou
• An Byeongil

Classifications

• F02B2039/168

  the rotational speed of pump or exhaust drive being limited · CPC title

• F02D41/34

  with means for controlling injection timing or duration · CPC title

• Y02T10/40

  Engine management systems · CPC title

• F02D41/009

  using means for generating position or synchronisation signals · CPC title

• F02D2200/0406

  Intake manifold pressure · CPC title