초록 ▼

A control for an internal combustion engine by pressure ratio management. The ratio of combustion chamber pressure to motored pressure is determined for several predetermined crankshaft rotational angles. These pressure ratios are used to control ignition timing for MBT, diluent gas flow rate (EGR)

A control for an internal combustion engine by pressure ratio management. The ratio of combustion chamber pressure to motored pressure is determined for several predetermined crankshaft rotational angles. These pressure ratios are used to control ignition timing for MBT, diluent gas flow rate (EGR) and fuel balance among combustion chambers. The control requires from three to five pressure samples for each combustion event, depending on sensor and control options. The pressure sensors need not sense absolute pressure if they are linear and do not change gain or bias significantly during one cycle.

대표청구항 ▼

A combustion control for an internal combustion engine of the type having a plurality of combustion chambers, air supply apparatus for the combustion chambers, fuel supply apparatus having individual control for each combustion chamber, a rotating crankshaft and ignition apparatus for the combustion

A combustion control for an internal combustion engine of the type having a plurality of combustion chambers, air supply apparatus for the combustion chambers, fuel supply apparatus having individual control for each combustion chamber, a rotating crankshaft and ignition apparatus for the combustion chambers comprising, in combination: means responsive to the pressure in each combustion chamber to generate signals for a combustion event indicating combustion pressure and motored pressure at a predetermined crankshaft rotational angle at substantially complete combustion; means effective to compute, from the signals, a ratio of combustion pressure to motored pressure at the predetermined crankshaft rotational angle at substantially complete combustion; means effective to derive from values of the ratio computed by the last means an average ratio for all combustion chambers and adjust the fuel supplied to each combustion chamber in accordance with the average ratio less one divided by the ratio for that combustion chamber less one to even the fuel distribution among the combustion chambers, whereby the fuel flow is optimized for lean burn operation.