FUEL CONSUMPTION CALCULATION UNIT, FUEL CONSUMPTION MEASURING APPARATUS, AND EXHAUST GAS MEASURING APPARATUS
First Claim
1. A fuel consumption calculation unit that, with use of an exhaust gas flow rate obtained by a flow rate sensor provided in an exhaust gas flow path through which exhaust gas of an engine flows, an air-fuel ratio obtained by an air-fuel ratio sensor provided in the exhaust gas flow path, and exhaust gas density, calculates fuel consumption of the engine,the fuel consumption calculation unit changing the exhaust gas density on a basis of the air-fuel ratio obtained by the air-fuel ratio sensor, the exhaust gas density being used for the calculation of the fuel consumption.
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Accused Products
Abstract
The present invention is intended to, at the time of directly measuring a flow rate of exhaust gas flowing through an exhaust gas flow path and an air-fuel ratio of the exhaust gas, and on the basis of the flow rate and air-fuel ratio of the exhaust gas, calculating fuel consumption, reduce a measurement error of the fuel consumption. Also, the invention is a fuel consumption calculation unit that, with use of an exhaust gas flow rate obtained by a flow rate sensor provided in an exhaust gas flow path through which exhaust gas of an engine flows, and an air-fuel ratio obtained by an air-fuel ratio sensor provided in the exhaust gas flow path, calculates fuel consumption of the engine, and on the basis of the air-fuel ratio obtained by the air-fuel ratio sensor, changes a value of exhaust gas density used for the calculation of the fuel consumption.
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Citations
8 Claims
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1. A fuel consumption calculation unit that, with use of an exhaust gas flow rate obtained by a flow rate sensor provided in an exhaust gas flow path through which exhaust gas of an engine flows, an air-fuel ratio obtained by an air-fuel ratio sensor provided in the exhaust gas flow path, and exhaust gas density, calculates fuel consumption of the engine,
the fuel consumption calculation unit changing the exhaust gas density on a basis of the air-fuel ratio obtained by the air-fuel ratio sensor, the exhaust gas density being used for the calculation of the fuel consumption.
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3. A fuel consumption measuring apparatus that measures fuel consumption of an engine, the fuel consumption measuring apparatus comprising:
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a flow rate sensor that is provided in an exhaust gas flow path through which exhaust gas emitted from the engine flows and measures a flow rate of the exhaust gas flowing through the exhaust gas flow path; and a calculation unit that, with use of the exhaust gas flow rate obtained by the flow rate sensor, an air-fuel ratio obtained by an air-fuel ratio sensor provided in the exhaust gas flow path, and exhaust gas density, calculates the fuel consumption of the engine, wherein the calculation unit changes the exhaust gas density on a basis of the air-fuel ratio obtained by the air-fuel ratio sensor, the exhaust gas density being used for the calculation of the fuel consumption.
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4. An exhaust gas measuring apparatus that utilizes an air-fuel ratio sensor provided in an exhaust gas flow path through which exhaust gas emitted from an engine flows, and a temperature sensor that measures temperature of the exhaust gas emitted from the engine, the exhaust gas measuring apparatus comprising:
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a related data storage part that stores a relationship between concentration of each component contained in the exhaust gas and an air-fuel ratio; a temporary concentration calculation part that refers to the related data storage part to thereby calculate temporary H2O concentration that is H2O concentration corresponding to a measured air-fuel ratio obtained from the air-fuel ratio sensor; and a lost H2O calculation part that, on a basis of saturated water vapor concentration at the exhaust gas temperature measured by the temperature sensor and the temporary H2O concentration, calculates a lost H2O amount that is an amount of H2O lost by condensation and the like in a path to a measuring point of the air-fuel ratio sensor. - View Dependent Claims (5, 6, 7, 8)
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Specification