Patent ID: 8855889

Claim:
A method for open-loop and closed-loop control of an internal combustion engine, comprising the steps of: automatically controlling rail pressure (pCR) in a closed-loop rail pressure control system by a suction throttle on a low-pressure side as a first pressure regulator; generating a rail pressure disturbance variable (VDRV) for influencing the rail pressure (pCR) by way of a pressure control valve on a high-pressure side as a second pressure regulator, by which fuel is redirected from a rail into a fuel tank; setting a shutdown mode when an engine shutdown is detected, where the PWM signal (PWMDV) is output with a value of zero when the shutdown mode is set; terminating the shutdown mode and setting a normal mode when an actual rail pressure (pCR(IST)) exceeds an initial value (pSTART) and a verified engine speed (nMOT) is detected; and determining an opening/closing position of the pressure control valve by a PWM signal (PWMDV) by computing the PWM signal (PWMDV) as a function of a resultant set volume flow (Vres(SL)) when the normal mode is set, including setting a protective mode when a dynamic rail pressure (pCR(DYN)) exceeds a maximum pressure value (pMAX) and the protective mode is enabled, and temporarily setting the PWM signal (PWMDV) to a maximum value when the protective mode is set.