Abstract: A method of producing a substantially regular cylindrical body that consists of a deformable material, especially a sintered metal blank. The blank is provided with an interior helical recess. The blank is first produced with a substantially linear course of the interior recess, for example by extrusion. The body is cut to a defined length and is subjected to a rolling movement by a friction surface while being supported across its entire length on a support. The speed of the rolling movement changes in a linear and continuous manner across the length of the body, thereby regularly twisting the body.

Abstract: The invention relates to a method for determining the injection time of the injection system of an internal combustion engine, comprising the following steps: detecting a crankshaft signal that indicates the relative position of the crankshaft, determining the injection time on the basis of said crankshaft signal, detecting the phase angle of the crankshaft, synchronizing the calculated injection time on the basis of the phase position of the crankshaft, said phase position of the crankshaft being determined on the basis of the crankshaft signal.

Abstract: For the checking of an exhaust gas recycling valve, the control signal for the exhaust gas return valve is returned from a defined value to zero, in the idle state of the internal combustion engine whilst the vehicle is at a standstill and the reaction of the signal (MAF) from an airflow detector in the inlet tract is evaluated. Should said signal not exceed a given threshold value (MAF SWD), within a first time period (T2), then a faulty dynamic is assigned to the exhaust recycling valve. Should the signal not exceed a second given threshold value(MAF SWS), within a second time period (T3), then it is determined that the exhaust recycling valve can not be completely shut.

Abstract: The invention relates to a method for producing a substantially regular cylindrical body that consists of a deformable material, especially a sintered metal blank (10). Said blank is provided with an interior helical recess (12). The blank is first produced with a substantially linear course of the interior recess (12), for example by extrusion. The body (10) is cut to a defined length and is subjected to a rolling movement by means of a friction surface (18) while being supported across its entire length on a support (16). The speed of said rolling movement changes in a linear and continuous manner across the length of the body (10), thereby regularly twisting the body (10).

Abstract: A method for controlling an injection of fuel in an internal combustion engine in which steady-state optimum injection parameters, in particular the start-of-injection angle, is corrected for non-steady-state operating phases. The correction is carried out by a transmission element to which the driver's request is fed as an input and correction parameters are determined therefrom. Using the correction parameters, fuel injection parameters obtained from a characteristic diagram that is optimum for steady-state operating conditions are corrected. In this manner, the behavior of the internal combustion engine is improved for non-steady-state operating phases.

Abstract: A method for monitoring a fuel pressure uses a trigger value or components of the trigger value, with which a pressure adjusting member is triggered. A pressure drop is detected if the trigger value or components thereof deviate from a value typical for that operating point.

Abstract: Exact metering of the fuel to be injected into the cylinder of an internal combustion engine takes into account the pressure in a high-pressure common rail, the required injection mass of fuel, and a compression prevailing in the respective cylinder at an injection onset.

Abstract: A method for detecting irregular combustion processes in a multicylinder diesel internal combustion engine includes detecting incorrect injections and non-injections by recording combustion noise in individual cylinders through the use of one or more structure-borne noise sensors. Subsequently, a check is performed as to whether or not sensor signals exceed threshold values individual to each cylinder within or outside fixed measurement windows.

Abstract: A method and a circuit configuration for gear detection in a motor vehicle transmission detect a signal corresponding to an input rpm and a signal corresponding to an output rpm of the transmission. A quotient of the output rpm to the input rpm is formed. A gear that has been engaged is detected from this quotient and from a known gear ratio of the transmission. A variation over time of the ratio of the output rpm to the input rpm of the transmission is ascertained and compared with a limit value. If the limit value is exceeded, a determination is made that no gear has been engaged.

Abstract: An apparatus for manufacturing a rod of hard metal or ceramic with at least one helical inner bore. A plasticized mass of hard metal or ceramic is simultaneously forced through a die and twisted. Either the mass is twisted uniformly over the cross-section of the billet by a spinner immersed in the mass or the spinner is rotated by the mass. The mass emerges either subject to torsion or entirely or mostly without torsion from a smooth downstream channel through the die. A filament-shaped material extends or is injected into the mass to produce the inner bore or bores.

Abstract: Maximum compression in the cylinder of an internal combustion engine is ascertained from the values for the maximum compression in the cylinder in overrunning operation of the engine and a ratio of the charge pressures in operation under load and in overrunning operation.

Abstract: A process for suppressing torque jumps during operation of an internal combustion engine prevents torque jumps when switching pilot injection (pre-injection) on and off in a diesel internal combustion engine by forming a difference between a predetermined total quantity of fuel to be injected and a pilot quantity to be injected by a pilot injector and acting upon the difference with a correction factor that produces torque balancing. A difference quantity which is corrected in this manner represents a main injection quantity.

Abstract: A method for controlling an exhaust gas recirculation device in an internal combustion engine includes calculating an actual value of an exhaust gas recirculation rate from a current air flow rate measured by an air flow rate meter and a theoretical air flow rate that would result without exhaust gas recirculation. A difference is formed from a desired value stored as a function of load and from the actual value for the exhaust gas recirculation rate. The difference is supplied to a controller which triggers an exhaust gas recirculation valve in such a way that a desired value of the exhaust gas recirculation rate is established.

Abstract: An extruder for extrusion manufacturing a rod of hard metal or ceramic with at least one helical inner bore. A plasticized mass of hard metal or ceramic is simultaneously forced through a die and twisted. Either the mass is twisted uniformly over the cross-section of the billet by a spinner immersed in the mass or the spinner is rotated by the mass. The mass emerges either subject to torsion or entirely or mostly without torsion from a smooth downstream channel through the die. A filament-shaped material extends or is injected into the mass to produce the inner bore or bores.

Abstract: An extruder for extrusion manufacturing one of a hard metal and a ceramic rod with at least one helical inner bore and having a smooth outer surface substantially free of elevations and depressions includes a housing and a die connected to the housing. The mechanism for forcing a plasticized mass through the die is provided wherein the mass is shaped in the form of a billet having a cross-section. A spinner is located in the housing upstream of the die for twisting the mass uniformly over the cross-section of the billet, the spinner being surrounded by an axial flow of the mass. A smooth channel is located downstream of the spinner such that the mass emerges from the channel through the die and a mechanism is provided suspending a filament in the mass wherein the filament follows a twisting movement of the twisted mass so as to form a helical inner bore therein.

Abstract: The invention relates to a extrusion die tool for producing a hard metal or ceramic rod with at least one twisted internal bore (14). The nose (3) of the nozzle (2) has a smooth cylindrical channel (4). A bearer (6) is fitted coaxially inside the nozzle (2) which has a plurality of elastic threads (9) and/or channels or bores corresponding to the desired number of internal bores for the thread-shaped pressing of a plastic material into the extruded material. The bearer (6) and the nozzle nose (3) are rotary, i.e. they rotate about their longitudinal axes. The pitch of the twisted internal bores (14) produced is thus determined by the rotation speed of the thread bearer (6) and/or the nozzle nose (3) and the rate of flow of the extruded material. Rod blanks with high-precision helical internal bores (14) can thus be produced.