Patent ID: 9624867
Date: 2017-04-18
CPC Classifications: F02D,F02M

Claim:
1. A method for open-loop and closed-loop control of an internal combustion engine, comprising the steps of: controlling maximum rail pressure by a passive pressure control valve connected directly to the rail by a first independent discharge line; 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 the rail into a fuel tank in order to reproduce a constant leakage by an open-loop control of the pressure control valve, including computing the rail pressure disturbance variable (VDRV) as a function of actual rail pressure (pCR(IST)) and a set volume flow (VDV(SL)) of the pressure control valve by a pressure control valve input-output map, and further including realizing a set volume flow input-output map in a form so that in a low-load range, a set volume flow (VDV(SL)) with a positive value is computed, and in a normal operating range, a set volume flow (VDV(SL)) of zero is computed, wherein the set volume flow and a first set volume flow are identical as long as the first set volume flow is less than a maximum volume flow, the pressure control valve being connected directly to the rail by a second independent discharge line.