Patent ID: 8886439

Claim:
A method for open-loop and closed-loop control of an internal combustion engine with an independent A-side common rail system and an independent B-side common rail system, the method comprising the steps of, in a normal operating mode, automatically controlling rail pressure in each common rail system by a suction throttle on a low-pressure side as a first pressure regulator in a closed-loop rail pressure control system; simultaneously acting on the rail pressure with a rail pressure disturbance variable by way of a pressure control valve on a high-pressure side as a second pressure regulator by a pressure control valve volume flow being redirected from the rail into a fuel tank by the pressure control valve on the high-pressure side; setting a first emergency operating mode for an affected of the common rail systems if a defective rail pressure sensor and a nondefective pressure control valve are detected in the affected common rail system; setting a second emergency operating mode for the affected common rail system if a defective rail pressure sensor and simultaneously a defective pressure control valve are detected in the affected common rail system; and wherein normal operating mode continues to be set for the other, nondefective of the common rail systems.