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AssigneeRobert Bosch GmbH
InventorsHermann Gaessler, Udo Diehl, Karsten Mischker, Rainer Walter, Bernd Rosenau, Juergen Schiemann, Christian Grosse, Volker Beuche, Stefan Reimer
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The method for cylinder-charge control consists in implementing an internal recirculation of residual gas in the cylinder, through controlling the closing times (AS) of at least one exhaust valve of the respective cylinder and by opening (EÖ1) at least one intake valve in the vicinity of top dead center (OT) of the piston, along with intermittent discharge of residual gas in front of the at least one intake valve, and that within one charge-exchange process in the cylinder, in at least two phases (EÖ1, ES1, EÖ2, ES2) that are offset in time from one another, at least one intake valve is opened. This method optimizes the engine operation in the warm-up phase from the standpoint of consumption, pollutant emission and running smoothness.
A method for controlling the cylinder charge in the case of an internal combustion engine- having variable timing of the gas-exchange valves (EV, AV) of its cylinders (ZY), an internal recirculation of the residual gas in the cylinder (ZY) being caused, along with the intermittent discharge of residual gas in front of the at least one intake valve in which, by controlling the closing times of the at least one exhaust valve (AV) of the respective cylinder (ZY) and by opening at least one intake valve (EV) in the vicinity of top dead center (OT),
The method as recited in one of the preceding claims, wherein the beginning (AÖ, EÖ1, EÖ2) and the end (AS, ES1, ES2) of the opening phases and/or the lifts and/or the flank steepnesses of the opening curves of the intake valves (EV) and exhaust valves (AV) are selected such that, after conclusion of the charge-changing process in the cylinder, the respective desired quantities of fresh gas and residual gas are present, and an internal flow in the combustion chamber and the turbulence of the cylinder charge are present in a desired form and intensity.
The method as recited in one of the preceding claims, wherein the beginning (AÖ, EÖ1, EÖ2) and the end (AS, ES1, ES2) of the opening phases and/or the lifts and/or the flank steepnesses of the opening curves of the intake (EV) and exhaust valves (AV) are controlled according to the criteria of an optimal mixture formation quality and exhaust-gas quality, the lowest possible energy input for actuating the valves (AV, EV) and for the discharge and re-aspiration of residual gas, and the lowest possible fuel consumption.
Dependencies are inferred from the claim text.