Patent ID: 9328689
Filing Date: 2016-05-03
CPC Classification: F02D,F02M

Claim Text:
1. A method for open-loop and closed-loop control of an internal combustion engine, comprising the steps of: automatically controlling a rail pressure during normal operation in a closed-loop rail pressure control system by a suction throttle on a low-pressure side of the closed-loop rail pressure control system, which suction throttle acts as a first pressure regulator, and, simultaneously, the rail pressure is acted upon with a rail pressure disturbance variable of a pressure control valve on a high-pressure side of the closed-loop rail pressure control system, in which pressure control valve acts as a second pressure regulator by a pressure control valve volume flow being redirected from a rail into a fuel tank by the pressure control valve on the high-pressure side; and, if a defective rail pressure sensor is detected, changing to an emergency operating mode, in which the pressure control valve on the high-pressure side is actively actuated and the suction throttle on the low-pressure side is actuated as a function of a common set point value, wherein the common setpoint value corresponds to a set emergency operation volume flow, which is computed by an emergency operation input-output map as a function of a set injection quantity and engine speed, the method further including, in the emergency operating mode, computing a PWM signal for activating the pressure control valve as a function of the set emergency operation volume flow and a set rail pressure, wherein a leakage volume flow is superimposed on the set emergency operation volume flow as a correction variable of the closed-loop rail pressure control system.