FIELD: internal combustion engines.
SUBSTANCE: methods are provided for finding the bulk modulus of a fuel used in the direct injection system of an internal combustion engine. Method is needed to continuously monitor and reliably calculate the fuel's bulk modulus during engine operation on-board the vehicle, where the fuel's bulk modulus may be used to infer the ratio of fuels in a fuel mixture or determine the density of supercritical propane when propane is used as the injected fuel. To find the fuel's bulk modulus on-board a vehicle, methods are proposed that involve monitoring and recording fuel rail pressures, high pressure pump duty cycles, and fractional liquid volume pumped values in order to find zero flow relationships.
EFFECT: invention can be used in fuel management systems for internal combustion engines.
21 cl, 9 dwg
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