Method and device for varying the supply pressure

专利名称：Method and device for varying the supply

pressure applied to a high pressure pumpand generated by a low pressure pump

发明人：Klaus Joos,Jens Wolber,Thomas

Frenz,Hansjoerg Bochum,Markus Amler

申请号：US10111612申请日：20020528公开号：US06708671B1公开日：20040323

专利附图：

摘要：Method for varying a prepressure (p_des) generated by a low-pressure pump

and applied to a high-pressure pump with the low-pressure pump () and the high-pressure pump () pumping fuel for the internal combustion engine (). In order to keepthe prepressure (p_des), on the one hand, as low as possible to take load off the low-pressure pump () and to, on the other hand, adjust the prepressure (p_des) so high that avaporization of the fuel is reliably avoided, the invention suggests that: the actualtemperature (T_Krst) of the fuel in the high-pressure pump () is determined; aprepressure (p_des) as low as possible is determined in dependence upon the fueltemperature (T_Krst) for which a vaporization of the fuel in the high-pressure pump () isreliably avoided; and, the low-pressure pump () is so driven or controlled that it

generates the determined prepressure (p_des). The method is preferably carried out onthe basis of physical models of the high-pressure pump ().

申请人：ROBERT BOSCH GMBH

代理人：Walter Ottesen

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