Process for automatically controlling the rail pressure during a starting operation
AssigneeMTU Friedrichshafen GmbH
InventorArmin Dölker
Life of this patent
Estimating the term…
Abstract
A process for automatically controlling the rail pressure (pCR) in an internal combustion engine with a common-rail system during the starting operation, the process including: calculating control deviation from a nominal rail pressure and an actual rail pressure; calculating, in a pressure controller, a correcting variable for actuating a suction throttle on the basis of the control deviation; and the suction throttle determining the required quantity of fuel. After the engine has been started, an adaptation process is activated upon detection of a negative control deviation of the rail pressure (pCR) followed by a positive control deviation, as a result of which the correcting variable is changed temporarily in such way as to increase the amount of fuel being delivered.
Claims8
A process for automatically controlling a rail pressure (pCR) in an internal combustion engine with a common rail system during a starting operation, comprising the steps of:
- calculating a control deviation (ep) from a nominal rail pressure (pCR(SL)) and an actual rail pressure (pCR(IST));
- calculating a correcting variable, in a pressure controller, for actuating a suction throttle on the basis of the control deviation (ep);
- determining, with the suction throttle, a required quantity of fuel;
- and,
- after the engine has been started, activating an adaptation process upon detection of a negative control deviation of the rail pressure (pCR) followed by a positive control deviation, as a result of which the correcting variable is changed temporarily so as to increase the amount of fuel being delivered.
Dependencies are inferred from the claim text.