FIELD: mechanical engineering; internal combustion engines.
SUBSTANCE: proposed method of delivery and control of fuel delivery to nozzle of internal combustion engine by high-pressure fuel pump comes to filling pump working volume with fuel at moderate pressure, sealing of said working volume and subsequent compression of fuel in volume by forced reduction according to operating conditions of engine, directing of fuel from working volume into nozzle after attaining of injection pressure and proceeding with out of fuel at injection pressure from working volume by subsequent decreasing and also changing phases of beginning of compression and end of forcing out of fuel and value of cyclic delivery. Reduction of working volume is provided by cubic strain of piezopack consisting of set of elements made of piezoelectric material and arranged inside working volume by delivering electric signals to piezopack, value of cyclic delivery of fuel is provided by corresponding frequency and duty factor of electric signals. Device for implementing the method is high-pressure fuel pump consisting of housing with variable working volume changed according to operating conditions of engine. Working volume has cyclic hydraulic couplings set by means of moderate pressure main line with feed pump in process of filling of working volume with fuel and by means of high-pressure main line through return value with nozzle in process of fuel delivery to nozzle. Design peculiarity is that working volume consists of at least one chamber accommodating piezopack consisting of set of elements made of piezoelectric material, piezopack being electrically coupled with control signal generator, working volume is hydraulically coupled with moderate pressure main line through return value and additionally coupled by channel with bleed valve at filling of fuel. Pump housing is arranged on engine so that channel is in upper point of working volume.
EFFECT: improved reliability, simplified design of high-pressure fuel pump, enlarged range of fuel delivery control.
4 cl, 4 dwg
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