Method for checking a calibration of a pressure sensor of a motor vehicle injection system and control device, high-pressure injection system and motor vehicle

摘要

The invention relates to a method for checking a pressure sensor (35) of a high pressure injection system (13), wherein in a compression chamber (33) of a high pressure pump (15) a piston (22) of the high pressure pump (15) in successive pump cycles to a top dead center ( 31) and an inlet valve (16) is closed by a control device (17) by energizing an electromagnet (18). The invention provides that by the control device (17) with a closed inlet valve (16) of the electromagnet (18) is acted upon by a measuring current (47) and, while the piston (22) from a top dead center (31) is moved away a predetermined time variation (50) of the measuring flow (47) an opening position (43) of the piston (22) is detected at which an opening movement of the intake valve (16) begins, and over several pump cycles, a desired value (37) of the fluid pressure (P ) and it is checked here whether a determined change (56) of the opening position (43) with respect to the changed setpoint value (37) satisfies a predetermined matching criterion (52).