Control device of internal combustion engine

Patent metadata

Field	Value
Publication number	US-10995690-B2
Application number	US-201816650200-A
Country	US
Kind code	B2
Filing date	Sep 28, 2018
Priority date	Oct 12, 2017
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

In an internal combustion engine, fluctuations in combustion torque are suppressed to reduce vibration and prevent deterioration of ride comfort of a driver. Therefore, a control device of an internal combustion engine 100 having a plurality of cylinders 150 (a first cylinder 151, a second cylinder 152, a third cylinder 153, and a fourth cylinder 154) includes a combustion state detection unit for detecting whether the plurality of cylinders 150 are in a normal combustion state or a flame-out state, and a control device 1 which controls driving of a fuel pump 131 that is a load of a combustion torque generated by the cylinder 150. The control device 1 suppresses the driving of the fuel pump 131 at a predetermined combustion timing of the cylinders 151 to 154 of the flame-out state in a case where it is determined that any one of the cylinders 151 to 154 among the plurality of cylinders 150 is in the flame-out state.

First claim

The invention claimed is:

1. A control device for an internal combustion engine which includes a plurality of cylinders, the control device comprising:
a combustion state detection unit that detects whether the plurality of cylinders are in a normal combustion state or an abnormal combustion state; and
a control unit that controls driving of a vehicle auxiliary machine that is a load of a combustion torque generated in the cylinder,
wherein, in a case where it is determined that any one of the plurality of cylinders is in an abnormal combustion state, the control unit suppresses driving of the vehicle auxiliary machine at a predetermined combustion timing of the cylinder in the abnormal combustion state.

2. The control device for an internal combustion engine according to claim 1 ,
wherein the predetermined combustion timing is a top dead center of a piston in the cylinder in the abnormal combustion state, and
wherein the control unit drives the vehicle auxiliary machine such that a load on the vehicle auxiliary machine is not generated at the top dead center of the piston of the cylinder in the abnormal combustion state.

3. The control device for an internal combustion engine according to claim 2 ,
wherein, based on a determination that a combustion torque in a predetermined one of the plurality of cylinders is lowered as much or more than a first threshold value with respect to a combustion torque in the normal combustion state of the predetermined cylinder, the control unit suppresses driving of the vehicle auxiliary machine at the top dead center of the piston of the cylinder which is determined such that the combustion torque is lowered as much or more than the first threshold value.

4. The control device for an internal combustion engine according to claim 3 ,
wherein the vehicle auxiliary machine is a fuel pump that supplies fuel to the cylinder,
wherein, based on a determination that the combustion torque in the predetermined cylinder is lowered as much or more than the first threshold value with respect to the combustion torque in the normal combustion state of the predetermined cylinder, the control unit drives the fuel pump such that a drive torque of the fuel pump becomes a maximum value at the top dead center of the piston of the cylinder which is determined such that the combustion torque is lowered as much or more than the first threshold value.

5. The control device for an internal combustion engine according to claim 4 ,
wherein the fuel pump includes a pressurizing chamber in which fuel is pressurized, a suction valve that controls supply of fuel to the pressurizing chamber, and a plunger that pressurizes the fuel in the pressurizing chamber by driving vertically, and a cam which drives the plunger in the vertical direction, and
wherein the number of vertices of the cam in a sectional view is set to be equal to the number of cylinders.

6. The control device for an internal combustion engine according to claim 5 , further comprising:
an in-cylinder pressure sensor that detects each pressure in the plurality of cylinders; and
a crank angle sensor that detects a rotation angle of a crank shaft of the internal combustion engine,
wherein the control unit calculates a combustion torque of the cylinder based on a pressure of the cylinder detected by the in-cylinder pressure sensor and a rotation angle of the crank shaft detected by the crank angle sensor, and drives the fuel pump such that a drive torque of the fuel pump becomes a maximum value at the top dead center of the piston of the cylinder which is determined such that the combustion torque of the cylinder is lowered as much or more than the first threshold value with respect to the normal combustion state of the cylinder.

7. The control device of an internal combustion engine according to claim 6 ,
wherein, in a case where a combustion torque of the cylinder is lowered as much or more than the first threshold value with respect to the combustion torque in the normal combustion state of the cylinder, the combustion state detection unit determines that extinction has occurred in the cylinder.

8. The control device for an internal combustion engine according to claim 1 ,
wherein the predetermined combustion timing is a top dead center of a piston in the cylinder, and
wherein the control unit drives the vehicle auxiliary machine such that a load on the vehicle auxiliary machine becomes a maximum value at the top dead center of the piston.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• OOHATA Eiichirou

Classifications

• Y02T10/40

  Engine management systems · CPC title

• F02M59/102

  Mechanical drive, e.g. tappets or cams (F02M45/063 takes precedence) · CPC title

• F02D41/1495 Primary

  Detection of abnormalities in the air/fuel ratio feedback system · CPC title

• F02D41/22

  Safety or indicating devices for abnormal conditions {(in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809)} · CPC title

• F02D2200/1012

  Engine speed gradient · CPC title