Fuel-injection system comprising pressure regulation in the return line
AssigneeRobert Bosch GmbH
InventorPeter Schueler
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Abstract
A common rail fuel injection system is proposed in which the pressure in the return line (27) is controlled as a function of the delivery pressure of the presupply pump (19). This improves the operating behavior of a high-pressure fuel pump (1) and the injectors, not shown, which are supplied with fuel by means of a common rail (3). The pressure in the return line (27) is controlled by means of a pressure control valve (31).
Claims7
A fuel injection system for internal combustion engines, with a high-pressure fuel pump (1), a common rail (3), and at least one injector, in which the high-pressure fuel pump (1) supplies fuel to the injector(s) by means of the common rail (3), with a presupply pump (19) that delivers fuel from a tank (9) to the high-pressure fuel pump (1), with a pressure control of the delivery pressure of the presupply pump (19), with a return line (27) for conveying fuel away from the injector(s) and/or from the high-pressure fuel bottle (1), and with a pressure control in the return line (27), characterized in that the pressure in the return line (27) is controlled as a function of the delivery pressure of the presupply pump (19).
The fuel injection system according to one of the preceding claims, characterized in that the pressure control valve (31) has at least one inlet (41), one outlet (47), and a control pressure connection (39), and that the control pressure connection (39) is hydraulically connected to the pressure side of the presupply pump (1).
Dependencies are inferred from the claim text.