US 2017/0284330 A1 · METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE

Abstract

A method for operating an internal combustion engine, in which fuel is supplied to the internal combustion engine by a rotary pump, and the speed of the pump and/or the electrical current for feeding the pump (pump current) is controlled in accordance with a requirement variable, taking into account a determination specification. When in an overrun mode, a calibration is carried out and the speed of the pump is detected and is maintained during the calibration step. Once the triggering pressure for a calibration valve, arranged on the high-pressure side of the pump, has been reached, the pump current is detected and the determined speed and the determined pump current are used to calibrate the determination specification. A calibration in the overrun mode is performed without alteration to the speed of the fuel pump. This prevents a variable behaviour of the fuel pump which might produce undesired operating conditions.

Claims13

Dependent claims

A method for operating an internal combustion engine, in which fuel is supplied to the internal combustion engine, comprising the steps of:

providing a rotating pump having a pressure side, the rotating pump having a rotational speed and a pump current;
providing a demand variable;
providing a calibration valve in fluid communication with the pressure side of the rotating pump;
providing a demand specification having a characteristic map;
and
providing a trigger pressure which actuates the calibration valve;
changing the operating mode of the internal combustion engine to an overrun mode of operation;
performing a calibration including detecting and maintaining the rotational speed of the rotating pump, and detecting the pump current upon actuation of the calibration valve at the trigger pressure, such that the rotational speed of the rotating pump and the pump current of the rotating pump are part of the determination specification;
controlling the rotational speed of the fuel pump and the pump current for feeding the fuel pump based on the demand variable and the determination specification.

6 more elements

Dependencies are inferred from the claim text.

Method for operating an internal combustion engine

Life of this patent

Method for operating an internal combustion engine

Life of this patent

Abstract

Claims13