Apparatus and Method for Calculating Work Load of Engine
First Claim
1. An apparatus for calculating work of an engine, the apparatus comprising:
- means for pre-establishing, as a reference phase relation for a predetermined reference interval, a correlation in phase between an in-cylinder pressure of the engine and a reference signal consisting of a predetermined frequency component;
means for detecting an in-cylinder pressure of the engine for a given observed interval;
reference signal determining means for determining a reference signal corresponding to the detected in-cylinder pressure of the engine such that the reference phase relation is met;
correlation coefficient determining means for determining a correlation coefficient between the detected in-cylinder pressure of the engine and the determined reference signal for the observed interval; and
work calculating means for calculating the work of the engine based on the correlation coefficient.
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Accused Products
Abstract
Work done by an engine can be accurately calculated regardless of the part in an observation section where the cylinder internal pressure signal is detected. The apparatus for calculating the work done by an engine establishes in advance correlation of phase between the cylinder internal pressure of the engine and a reference signal composed of a predetermined frequency component as a reference phase relation. A means for detecting the cylinder internal pressure of the engine for a predetermined observation section is provided. A reference signal corresponding to the detected cylinder internal pressure of the engine is calculated so that the reference phase relation is satisfied. A correlation coefficient of the detected cylinder internal pressure of the engine and the calculated reference signal is calculated for the observation section and the work done by the engine is calculated in accordance with the correlation coefficient.
16 Citations
30 Claims
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1. An apparatus for calculating work of an engine, the apparatus comprising:
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means for pre-establishing, as a reference phase relation for a predetermined reference interval, a correlation in phase between an in-cylinder pressure of the engine and a reference signal consisting of a predetermined frequency component; means for detecting an in-cylinder pressure of the engine for a given observed interval; reference signal determining means for determining a reference signal corresponding to the detected in-cylinder pressure of the engine such that the reference phase relation is met; correlation coefficient determining means for determining a correlation coefficient between the detected in-cylinder pressure of the engine and the determined reference signal for the observed interval; and work calculating means for calculating the work of the engine based on the correlation coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 10)
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7. An apparatus for calculating work of an engine, the apparatus comprising:
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component determining means for determining a frequency component desired for calculating the engine work, among frequency components acquired by frequency-resolving a volume change rate of the engine; means for pre-establishing, as a reference phase relation for a predetermined reference interval, a correlation in phase between an in-cylinder pressure of the engine and a reference signal consisting of the determined frequency component; reference signal determining means for determining a reference signal corresponding to an in-cylinder pressure in a given observed interval such that the reference phase relation is met; first determination means for determining a first correlation coefficient between the in-cylinder pressure of the engine in the observed interval and the determined reference signal; second determination means for determining a second correlation coefficient between the volume change rate of the engine in the observed interval and the determined reference signal; and work calculating means for calculating the engine work based on the first correlation coefficient and the second correlation coefficient. - View Dependent Claims (8, 9)
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11. A method for calculating work of an engine, comprising:
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(a) pre-establishing, as a reference phase relation for a predetermined reference interval, a correlation in phase between an in-cylinder pressure of the engine and a reference signal consisting of a predetermined frequency component; (b) detecting an in-cylinder pressure of the engine in a given observed interval; (c) determining a reference signal corresponding to the detected in-cylinder pressure of the engine such that the reference phase relation is met; (d) determining a correlation coefficient between the detected in-cylinder pressure of the engine and the determined reference signal for the observed interval; and (e) calculating the engine work based on the correlation coefficient. - View Dependent Claims (12, 13, 14, 15, 16, 20)
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17. A method for calculating work of an engine, comprising:
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(a) determining a frequency component desired for calculating the engine work engine, among frequency components that are obtained by frequency-resolving a volume change rate of the engine; (b) pre-establishing, as a reference phase relation for a predetermined reference interval, a correlation in phase between an in-cylinder pressure of the engine and a reference signal consisting of the determined components; (c) determining a reference signal corresponding to an in-cylinder pressure in a given observed interval such that the reference phase relation is met; (d) determining a first correlation coefficient between the in-cylinder pressure of the engine in the observed interval and the determined reference signal; (e) determining a second correlation coefficient between the volume change rate of the engine in the observed interval and the determined reference signal; and (f) calculating the engine work based on the first correlation coefficient and the second correlation coefficient. - View Dependent Claims (18, 19)
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21. An apparatus for calculating work of an engine, the apparatus comprising a control unit configured to:
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pre-establish, as a reference phase relation for a predetermined reference interval, a correlation in phase between an in-cylinder pressure of the engine and a reference signal consisting of a predetermined frequency component; detect an in-cylinder pressure of the engine for a given observed interval; determine a reference signal corresponding to the detected in-cylinder pressure of the engine such that the reference phase relation is met; determine a correlation coefficient between the detected in-cylinder pressure of the engine and the determined reference signal for the observed interval; and calculate the work of the engine based on the correlation coefficient. - View Dependent Claims (22, 23, 24, 25, 26, 30)
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27. An apparatus for calculating work of an engine, the apparatus comprising a control unit configured to:
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determine a frequency component desired for calculating the engine work, among frequency components acquired by frequency-resolving a volume change rate of the engine; pre-establish, as a reference phase relation for a predetermined reference interval, a correlation in phase between an in-cylinder pressure of the engine and a reference signal consisting of the determined frequency component; determine a reference signal corresponding to an in-cylinder pressure in a given observed interval such that the reference phase relation is met; determine a first correlation coefficient between the in-cylinder pressure of the engine in the observed interval and the determined reference signal; determine a second correlation coefficient between the volume change rate of the engine in the observed interval and the determined reference signal; and calculate the engine work based on the first correlation coefficient and the second correlation coefficient. - View Dependent Claims (28, 29)
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Specification