Fuel property detection for an engine using engine speed
First Claim
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1. A fuel property detecting system for an internal combustion engine, comprising:
- speed detecting means for detecting a rotation speed of an internal combustion engine;
speed integrating means for integrating the engine speed detected by said speed detecting means for a predetermined period of time after a start of said internal combustion engine; and
volatility determining means for determining the volatility of fuel fed to said internal combustion engine, on the basis of an integrated value of said engine speed integrated by said speed integrating means in relation to a predetermined determination value.
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Abstract
A fuel property, i.e., ordinary fuel, heavy fuel or mixture of both, is determined using an engine rotations. After an engine temperature exceeds 0° C. and an engine attains a complete combustion, an engine speed is integrated. It is determined whether a deviation between the integrated value of the engine speed and an integrated value of a set engine speed is larger than a predetermined determination value. As a result, it can be determined whether the fuel fed to the internal combustion engine has a volatility identical to that of the ordinary fuel, so that the fuel properties can be highly accurately determined.
56 Citations
12 Claims
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1. A fuel property detecting system for an internal combustion engine, comprising:
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speed detecting means for detecting a rotation speed of an internal combustion engine; speed integrating means for integrating the engine speed detected by said speed detecting means for a predetermined period of time after a start of said internal combustion engine; and volatility determining means for determining the volatility of fuel fed to said internal combustion engine, on the basis of an integrated value of said engine speed integrated by said speed integrating means in relation to a predetermined determination value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A fuel property detecting method for an internal combustion engine, comprising the steps of:
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determining a first time point when a complete combustion of fuel occurs in the engine after an engine starting operation; determining a second time point when an engine rotation speed attains a predetermined speed after the first time point; integrating the number of engine rotations after the second time point; and comparing an integration output value of the engine rotations with a predetermined value thereby to determine the property of fuel. - View Dependent Claims (10, 11, 12)
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Specification