Abstract: A heat transmission unit includes a channel conducting a coolant, and a channel conducting a fluid to be cooled. The two channels are separated from each other by a wall provided with ribs extending therefrom into at least one of the two channels. The channel conducting the fluid to be cooled includes a fluid inlet and a fluid outlet. The channel is separated by a partition wall, arranged in flow direction, into a first and a second partial channel having a first partial inlet for fluid and a second partial inlet for fluid, and a first partial outlet for fluid and a second partial outlet for fluid. At least the first partial inlet for fluid is adapted to be shut off by a first shut-off device.

Abstract: Previous heat transmission units have only low cooling efficiencies in case of small fluid mass flows. According to the invention, it is proposed to configure a heat transmission unit (1) in such a manner that a channel (4) conducting the fluid to be cooled is separated, by a partition wall (14;23,24;29,30), into at least two separated partial channels (15,16), a first one of these channels being adapted to be shut off by a shut-off means (21;27;31) arranged at a first partial fluid inlet (17) of this channel. Preferably, in spite of the closed condition of this inlet cross section, full use is made of the existing cooler surface in that there is effected, by suitable arrangement of the partition walls (14;23,24;29, 30) and by further shut-off means (28;32), a deflection of the fluid mass flow in the heat transmission unit (1).

Abstract: The invention relates to a throttle plate port whose pivot axis is disposed so as to be axially offset with respect to the throttle plate and whose radial peripheral surface is shaped, at least by sections, in the form of spherical sectors, where in the position which closes the bore the peripheral surface of the throttle plate abuts, in the form of a line, the seat face of the housing. Through this type of eccentric disposition and simultaneous realization of the peripheral surface, the housing can be realized without undercuts and nonetheless precise dosing can be achieved in the case of small pivot angles.

Abstract: The invention relates to an air-intake duct system (1) in which a throttle valve (40), an exhaust gas recirculating valve (29), a bypass valve (19), an exhaust gas cooler (11), against which exhaust gas flows via bypass valve (19), and, optionally, an air mass sensor are integrated. A complete intake unit for modern engines is hereby created, with which achieves a charging optimization and thus a reduction in fuel consumption as well as a reduction in pollutants by a corresponding thermal management in the engine by the exhaust gas cooler (11) that, together with a shell (3, 4) of the housing (2), is manufactured as a single piece. The individual add-on pieces (12, 19, 29, 40, 59) are optimally matched to one another and have, due to their designs, a low weight and a low finishing work requirement. This makes it possible to distinctly reduce assembly and manufacturing costs.

Abstract: The invention relates to a heat exchanger with a channel (4) through which cooling agent flows and a channel (3) through which fluid to be cooled flows, whereby ribs (6) project into at least one of the channels (3, 4). According to the invention, these ribs (6) feature a linear approach edge (11) and a linear flow-off edge (15), whereby the side walls (12) run continuously between the approach edge (11) and the flow-off edge (15). By these means it is achieved that a turbulent boundary layer forms at the ribs, which boundary layer ends in a turbulent eddy in the area of the flow-off edge (15). This leads to an increased efficiency of the heat exchanger and simultaneously to a good homogenization of the fluid. Moreover, sooting is reliably avoided.

Abstract: The invention relates to an air-intake duct system (1) in which a throttle valve (40), an exhaust gas recirculating valve (29), a bypass valve (19), an exhaust gas cooler (11), against which exhaust gas flows via the bypass valve (19), and, optionally, an air mass sensor are integrated. A complete intake unit for modern engines is hereby created, with which both a charging optimization and thus a reduction in fuel consumption as well as a reduction in pollutants are achieved by a corresponding thermal management in the engine by the exhaust gas cooler (11) that, together with a shell (3, 4) of the housing (2), is manufactured as a single piece. The individual add-on pieces (12, 19, 29, 40, 59) are optimally matched to one another and have, due to their designs, a low weight and a low requirement of finishing work. This makes it possible to distinctly reduce assembly and manufacturing costs.

Abstract: An exhaust gas recirculation valve in which an impact element is spaced from a head on a valve rod, in order to develop kinetic energy when activated end produce impact on the head to free a valve member which may have become stuck to the valve seat due to deposits on the seat from the recirculating exhaust gas. The impact member is activated when the engine is started and after the valve disk is free, the exhaust gas recirculation valve operates conventionally.

Abstract: A process and apparatus for utilization of fuels with alcohol additives for an internal combustion engine which are characterized by the fact that at the present time comercial types of fuel have approximately the same molecular weights, which are clearly distinct from the molecular weights of methanol and ethanol. By complete vaporization of a sample volume of fuel, depending on the admixture of alcohol to standard fuel, different volumes of vaporized fuel samples are produced, or different pressures are obtained if the volume is constant. Based thereon and on the sample temperature a correction signal is formed which is characterized by the alcohol and its content in the sample (as compared with reference values stored in a control device), and the correction signal can be utilized to regulate the engine control variables.

Abstract: An electromagnetic injection valve in which the spring acting between an iron core and a valve closure member is made of spring steel. The iron core is formed as a round rod which is reduced in diameter at the end thereof forming a stop surface for the valve closure member. A protruding support ring of nonmagnetic material is fixed to the valve closure member for the guidance of the spring, such that the turns of the spring are spaced from the surfaces of the reduced diameter end of the rod and the valve closure member in the region of the air gap between the rod and valve closure member by at least an amount equal to the reduction in diameter of the end of the rod.

Abstract: An electrmagnetic intermittent injection valve for supplying fuel to an intake duct of an internal combustion engine comprising a hollow body having a fuel inlet for admission of fuel from a fuel supply, a fuel outlet for supply of fuel to an intake duct of an internal combustion engine, and a fuel return for returning fuel back to the fuel supply. A ball valve is movable in the body between a first position in which the fuel outlet is closed and a second position in which the fuel outlet is open. A spring acts on the ball to urge the ball to the first position. A soft iron core is disposed in the body in facing relation with the ball, the body including a housing end portion of soft iron facing the ball valve. A coil in the body serves for energizing the core and the housing end portion for producing a magnetic field having lines of flux acting on the ball valve to urge the ball valve to the second position against the resilient opposition of the spring.

Abstract: A constant pressure carburettor comprises a mixing chamber 2 which is surrounded by a heating jacket 12, an operator controlled throttle valve 3 at the downstream end of the chamber 2, a fuel feeder 5, 6 at the upstream end of the mixing chamber and a choke valve 10 at an air inlet to the carburettor. The choke valve 10 is, in use, controlled automatically by the air flow into the carburettor in dependence on the opening of the throttle valve 3 and the speed of the engine to which the carburettor is fitted. The choke valve 10 tends to produce vortices or turbulence in the air flow and this tends to cause the fuel supplied by the feeder 5, 6 to the wall of the chamber 2 to be prematurely removed before it is heated. This adversely affects the vaporization of the fuel and the formation of the air-fuel mixture. To avoid turbulence or vortices in the chamber 2, a stabilization conduit 16 is provided between the choke valve 10 and the fuel feeder 5, 6.