US 2013/0096805 A1 · COMBUSTION DIAGNOSIS DEVICE FOR INTERNAL COMBUSTION ENGINE

Abstract

A combustion diagnosis device for a diesel engine having a plurality of cylinders, including an engine speed sensor for detecting a rotational speed of each cylinder, an injection correction amount calculation unit for calculating an amount of correction for fuel injection of each cylinder in accordance with the engine speed sensor, a rotational fluctuation calculation unit for calculating a rotational fluctuation of each cylinder in accordance with the engine speed sensor, and a combustion state determination unit for determining a combustion state of a determination-target cylinder in accordance with the rotational fluctuation when the correction amount calculated by the injection correction amount calculation unit reaches an upper limit threshold value.

Claims19

Dependent claims

1-6. (canceled)

A combustion diagnosis device for an internal combustion engine having a plurality of cylinders, comprising:

an engine rotational speed detection means for detecting the rotational speed of each cylinder of the internal combustion engine;
an injection correction amount calculation means for calculating the amount of correction for the fuel injection of each cylinder in accordance with the engine rotational speed detection means;
a rotational fluctuation calculation means for calculating the rotational fluctuation of each cylinder in accordance with the engine rotational speed detection means;
and
a combustion state determination means for determining the combustion state of a determination-target cylinder in accordance with the rotational fluctuation when the correction amount calculated by the injection correction amount calculation means reaches an upper limit threshold value.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/703,428Filed 10 Jun 2011

Priority

JP 2010-13452111 Jun 2010

Published

18 Apr 2013

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

G01M 15/046
By monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12: by monitoring revolutions
F02D 41/0085
Controlling each cylinder individually: balancing of cylinder outputs, e.g. speed, torque or air-fuel ratio
F02D 41/1498
With detection of the mechanical response of the engine: measuring engine roughness
F02D 41/22
Electrical control of supply of combustible mixture or its constituents: safety or indicating devices for abnormal conditions

Combustion diagnosis device for internal combustion engine

Life of this patent

Combustion diagnosis device for internal combustion engine

Life of this patent

Abstract

Claims19