Robert Boschgmbh

Mercedes-benz Aktiengesellschaft

Daimler-benz Ag

Dieter Scherenberg

Reinhard Latsch

Hans Schlembach

Walter Benedikt

Valerio Bianchi

Johannes Brettschneider

Jurgen Assenheimer

Edgar Brutsch

A method and apparatus is described for controlling the air supply in an internal combustion engine, in which, below a predetermined limiting value for the speed of the internal combustion engine, the air is drawn in via at least two long resonant intake pipes, each of which opens into in each case one of two partial collecting volumes of a resonant collecting receiver, the volumes being separated from one another via a separating element. Above the predetermined limiting speed, the two partial collecting volumes are connected to one another by opening the separating element. In order to be able to achieve a higher torque characteristic not only in the low and middle speed range but also in the high speed range, it is proposed to open the cross-section of a short intake pipe which connects the intake line to the resonant collecting receiver, this opening being performed simultaneously with the opening of the separating element.

Method and apparatus for controlling the air supply in an internal

A cylinder head of an internal-combustion enbgine with at least one inlet valve and a fuel injection in an air-intake channel has an evaporation element intended for improving the fuel/air mixture formation projecting into the air-intake channel. The evaporation element has high thermal conductivity in a partition wall between the inlet-valve channels in multi-valve engines and makes direct thermal contact between the air-intake channel and the main combustion space. The heating of the mixture mass located in the air-intake channel is thus self-regulated by the combustion heat in the main combustion space. The installation avoids the hitherto necessary resistance heating constituting a drain on the power supply and improves the heating regulation of the mixture mass.

Cylinder head with an evaporation element in an air-intake channel

In multi-valve engines, a partition wall dividing the intake channel into inlet-valve channels as an evaporation element in the intake channel of a cylinder head of an internal-combustion engine for improving the fuel-mixture formation and consequently for reducing the emission of hydrocarbons. The partition wall is electrically heated by a heating bar and is subjected to fuel substantially tangentially from a fuel injection located at the intake channel. As a result of this configuration, the flow behavior of the mixture is optimized in terms of the installation of evaporation elements in the intake channel, and an improved transmission of heat to the mixture and a homogeneous mixture formation are achieved. In addition, sealing problems between the intake channel and the surroundings are solved in a simple way.

Evaporation element in an internal-combustion engine cylinder head

The invention relates to an intake system for a mixture-compressing internal-combustion engine, having a heating element of flat form which is arranged in the intake channel downstream of a fuel-injection nozzle. The heating element is intended for heating the fuel/air mixture and which, above a specific cooling-water temperature, can be transferred from a working position extending transversely relative to the direction of flow into a position of rest lying in the direction of flow. The invention also relates to the method of the heating element position and electrical controlling heating status.

Intake system for a mixture-compressing internal-combustion engine

An apparatus for igniting lean fuel-air mixtures and wherein a preferably insertable ignition chamber is provided in the wall of an internal combustion engine, which ignition chamber communicates with the main combustion chamber of the internal combustion engine via a plurality of channels. At least one of the channels serves the purpose of delivering a portion of the fresh mixture entering from the main combustion chamber into the first ignition chamber in a direct stream into the rear portion thereof, remote from the combustion chamber, of the first ignition chamber. The other mixture portion of the fresh mixture charge of the ignition chamber is set into rotating motion in the swirl ignition chamber via channels discharging tangentially, on the combustion chamber side, into this chamber, so that a regulated turbulence is established the axial motion component of which is braked, as it advances in the swirl ignition chamber, by means of the fresh charge flowing back out of the rear first ignition chamber portion. In this manner, a substantial increase is attained in the first ignition capacity of the mixture in the ignition chamber.

Method for igniting lean fuel-air mixtures and an apparatus to perform

A method for igniting lean fuel-air mixtures and an apparatus for performing this method are described, wherein a preferably insertable ignition chamber is provided in the wall of an internal combustion engine, which ignition chamber communicates with the main combustion chamber of the internal combustion engine via a plurality of channels. At least one of the channels serves the purpose of delivering a portion of the fresh mixture entering from the main combustion chamber into the first ignition chamber in a direct stream into the rear portion thereof, remote from the combustion chamber, of the first ignition chamber. The other mixture portion of the fresh mixture charge of the ignition chamber is set into rotating motion in the swirl ignition chamber via channels discharging tangentially, on the combustion chamber side, into this chamber, so that a regulated turbulence is established the axial motion component of which is braked, as it advances in the swirl ignition chamber, by means of the fresh charge flowing back out of the rear first ignition chamber portion. In this manner, a substantial increase is attained in the first ignition capacity of the mixture in the ignition chamber.

An internal combustion engine having an ignition chamber forming a closed circular cylinder and communicating via at least one transfer channel with a main combustion chamber with the ignition chamber cylindrical wall being controlled by means of an annular thermal pipe to a virtually constant, high temperature and protected against a rapid cooling toward cooled parts of the internal combustion engine and against overheating. An ignition device inserted into the ignition chamber, with an electrode, forms a spark gap toward the cylindrical wall of the ignition chamber in the region between the middle of the ignition chamber and the transfer channels. To improve the stability of the electrode, the electrode is provided with a heat conductor so as to provide more severely leaning of the fuel-air mixture to be ignited while avoiding glow sparking and reducing the emission of noise.

Internal combustion engine having a main combustion chamber and an

An internal combustion engine having an ignition chamber communicating with a main combustion chamber via at least one transfer channel, with the ignition chamber forming a closed circular cylinder and its cylindrical wall being protected by an annular thermal pipe from too-rapid cooling and from overheating. In the wall of the ignition chamber, partial electrodes disposed in an insulated manner are provided which are electrically connectable via spark gaps with each other and with the ignition voltage supply line. As a result, ignition occurs near the wall in an area at an elevated temperature level and, in particular, in the immediate vicinity of the entry point of the fresh fuel-air mixture via the overflow channel so that, as a result, the flammability is maintained with increased leaning of the fuel-air mixture.

In order to enrich the fuel mixture fed to an internal combustion engine temporarily subsequent to engine braking, the invention proposes that engine braking is detected as the combination of a closed throttle and elevated engine speed. A detector for this condition supplies a signal to the fuel shut-off mechanism of a valve-control pulse generator. After engine braking, the counter is reset with the signal from the engine braking detector and counts engine-synchronous pulses. The counter contents are decoded and transformed into an analog signal which is used by the pulse generator for additional pulse extension to supply excess fuel to the engine for a limited period of time.

Method and apparatus for adjusting fuel supply to an internal combustion

The invention is in an externally ignited internal combustion engine which has one main combustion chamber per cylinder and one ignition chamber which communicates with the main combustion chamber via an excess flow channel, the opening member of which projects into the main combustion chamber and is embodied as a flame injector. After the ignition of the mixture located in the ignition chamber by means of a spark plug, when the jet of flame leaves the excess flow channel and enters the main combustion chamber through the flame injector, the fuel-rich mixture surrounding the opening of the ignition chamber is induced in the vicinity of the cooled walls of the main combustion chamber and thus the temperature of the jet of flame is lowered. In this way, the NO.sub.x concentration of the charge component comprising the jet of flame, and thus also the exhaust gas quantity as a whole, is reduced. At the same time, the turbulence of the charge in the main combustion chamber is rapidly increased at the instant of combustion, thus producing a much more desirable firing action.

Spark ignited internal combustion engine

A process for controlling the operation of an internal combustion engine based on the volumetric efficiency of the engine to define a primary nominal fuel quantity. The process also includes measuring the fluctuations in the volumetric efficiency. In order to operate the engine in a preferred leaned-out condition, a nominal set-point value of the permitted range of fluctuations of the volumetric efficiency is established and the actual measured fluctuations are maintained in that range by changing the fuel metered out to the engine. Various methods for measuring the volumetric efficiency indirectly by pressure measurements in the induction tube are presented.

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Stuttgart, Germany

Dieter Scherenberg