Continental Automotive Asnieres France

Siemens Automotive Hydraulics Sa

Dominique Veret

Philippe Bauer

Christian Hervault

Florent Sellas

Transfer pump for high-pressure petrol injection of the type including a piston () which delivers oil into a deformable element such as a bellows (), the deformations of the bellows () in a cylindrical chamber () filled with fuel causing a pumping effect whereby the fuel is pumped towards a rail () supplying high-pressure injectors, wherein elements are arranged for diverting some or all of the oil pumped by the piston () towards a chamber () without pressuring it so as to determine at will the useful stroke of the piston () and hence the quantity of fuel pumped at high pressure towards the rail ().

Transfer pump for high-pressure gasoline injection

The invention concerns a method for controlling high pressure fuel supply of a set of injectors connected to a common high pressure chamber, called common rail C in a direct injection fuel circuit, through a high pressure pump (P), by acting on the low pressure supply of said pump (P) through an electromagnetic slide valve (E), controlled by the computer managing the operating conditions of the engine which consists in providing, inside the electromagnetic valve (E) one or more internal leakage flows, either from high pressure to low pressure, or from low pressure upstream of the electromagnetic valve (E) to the low pressure downstream thereby solving the specific problems related to the three operating modes of the engine: engine brake, engine shutdown, idle speed.

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Verrieres le Buisson, France

Dominique Veret