A method and control device to the start of a gasoline engine
2012
The invention relates to a method for carrying out a high-pressure start of a gasoline engine with direct injection, and a fuel pressure is produced in a high pressure system comprising a high pressure accumulator by a high pressure pump, the fuel pressure is measured in the high-pressure accumulator and the associated high-pressure system with a high pressure sensor, the fuel from the high-pressure reservoir via at least one injection valve, in at least the fuel pressure, an injection quantity and a fuel flow rate by a control unit in dependence on a supplied to the controller signal from the high-pressure sensor is given a cylinder of the Otto engine is injected, whereby the fuel pressure in dependence on the operating point of the gasoline engine is to an upper system pressure specified and wherein the fuel pressure in the high pressure accumulator and the high-pressure system through an opening pressure of a pressure limiting valve to a Maxim aldruck is limited. It is provided that in a start of the spark ignition engine prior to release of the injection of the fuel at least one cylinder of the Otto engine, the fuel pressure in the high pressure system is set to a starting pressure, which is between the upper system pressure and the maximum pressure increases in the. The invention further relates to a control device for performing the method. A method and control device enabling the high-pressure start of fueled with ethanol or a mixture of ethanol and gasoline SI engine at low temperatures.
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