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AssigneeDr. Ing. h.c.F. Porsche Aktiengesellschaft
InventorWolfgang Schmid
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A multicylinder internal combustion engine having separate cylinder groups, each of which is associated with a fuel-air mixture supply means for selectively supplying a fuel-air mixture or only air thereto, and a process for supplying of a fuel-air mixture thereto. In accordance with all embodiments, air only is supplied to the second cylinder group when the engine is operating in a warmed-up condition, under partial load operating conditions, a fuel-air mixture being supplied to both cylinder groups, regardless of engine temperature conditions, once the partial load range has been exceeded. A fuel-air mixture is supplied to the first cylinder group in accordance with all embodiments, regardless of engine temperature or load conditions. In accordance with a preferred embodiment of the engine, a single cam disk is utilized to control the air supply through the air intakes for both cylinder groups in cooperation with a vacuum cell, and a temperature controlled venting device for the vacuum cell. In accordance with the process embodiments, the fuel-air supply to the second cylinder group during warm-up is either progressively increased and then decreased to an amount approximating zero, or is held constant throughout the predetermined load range; while, with the engine warmed-up for operation, the supply of air only to the second cylinder group, in the partial load range, is either progressively increased, held constant, and then decreased to an amount approximating zero, or is increased, held constant to the end of the partial load range and then abruptly decreased to the amount approximating zero.
Multicylinder internal combustion engine having separate cylinder groups, each cylinder group being associated with a fuel-air mixture supply means for selectively supplying a fuel-air mixture or only air thereto, wherein each cylinder group is associated with a throttle valve arranged in an intake pipe, each throttle valve being connected to a control lever and the position of the throttle valves being variable by an accelerator pedal actuated cam disk which is arranged to coact with the control levers, the control lever connected to the throttle valve that is associated with the first cylinder group coacts with a single curved path of the cam disk in all operating ranges of the internal combustion engine, both when the engine is warmed-up for operation and in the warming-up phase of the internal combustion engine;
A multicylinder internal-combustion engine having at least two cylinder groups to which, in each case, one fuel-air-mixture feeding device having fuel-injection valves that can be influenced by a control mechanism, is assigned, in which case, each cylinder group is assigned one throttle valve disposed in the intake tube, with the position of said throttle valve being changeable by means of a cam disk by the accelerator pedal, and in which case, the cam disk interacts with first and second control levers firmly disposed on the throttle valve shafts with respect to rotation, in which case, when the internal-combustion engine is warmed up until the end of a predetermined partial-load range is reached, a fuel-air mixture is supplied to a first cylinder group and air is supplied to a second cylinder group in such a way that the air volume in a remaining part of the partial load range that is connected to a first part, is decreased to a volume of approximately zero, and in which case, after passing through the predetermined partial-load range until a full-load is reached, a fuel-air-mixture is supplied to both cylinder groups, characterized in that
Dependencies are inferred from the claim text.