Abstract: A method of controlling a pneumatically operated servo-motor (1) having a linearly movable operating rod (6) is described in which the actual position of the operating rod is monitored continuously during each stroke, and when the rod reaches a position which lies a predetermined amount in front of a limit position reached during the preceding stroke the speed at which the operating rod travels towards the corresponding limit position of the current stroke is modified. In particular the method is used in a clutch actuating servo-motor to brake the speed of the operating rod at a position which corresponds to the initial contact between the clutch friction surfaces when the rod is moving to engage the clutch, so that the free travel of the clutch is taken up as quickly as possible, but the actual engagement is slowed in order to avoid undesirable jerkiness and wear.

Abstract: a fuel system for mixture-compressing internal combustion engines controls the pressure differential of the extraction air required for proportioning the fuel. The system includes a fuel proportioning device and a vane pump for generating a carrier air stream for transporting the fuel into the suction tube of the internal combustion engine. A control valve constructed as a differential pressure valve influences the air pressure at the fuel outlet area and consequently the differential pressure for fuel proportioning. The throttle point is located in the carrier air channel upstream from the fuel proportioning area. A change in differential pressure adapts the mixture composition for various operating conditions.

Abstract: A piston pump, for use for example for operating auxiliary mechanisms in motor vehicles, has a piston 1 which is reciprocated in a cylinder 2 by an eccentric 20 and a return spring 18. The cylinder 2 has an outlet valve 23, and inlet openings 4 in its side wall. Instead of moving the piston 1 so far downwards in the suction stroke of the pump that the piston head 6 L is below the inlet openings 4 to allow fluid to flow into the pump chamber 10, the piston is provided with a peripheral groove 13 and openings 11 in its side wall. The openings 11 lead to a recess 17 in the piston head and hence to the pump chamber 10. The groove 13 moves into communication with the inlet openings 4 at two separate times in each to and fro movement of the piston, that is in each pumping cycle, so that the fluid being pumped can only flow into the pump chamber from the inlet openings 4 during these two times.

Abstract: A fuel supply system for a mixture-compressing combustion engine includes a main air channel containing a throttle valve with a suction pipe connected to the downstream end of the main air channel and extending to the inlet valves for the engine. An air quantity measuring valve is located in the main air channel upstream of the throttle valve. A carrier-air channel branches off from the main air channel between the air quantity measuring valve and the throttle valve. Spaced from the main air channel is a fuel metering nozzle which opens into the carrier-air channel. A proportioning valve is located in the fuel metering nozzle and is adjustable by the air quantity measuring valve.

Abstract: A pneumatically operated diaphragm fuel pump comprising a ram actuated by a diaphragm and arranged in a drive chamber and a reversible lever subjected to the action of a tension spring for actuating suction and air-inlet valves. The lever is locked with respect to the ram for a given range of stroke of the ram and switching takes place only at the dead center positions of the diaphragm.

Abstract: A carburetor comprising an accelerator pump having a working chamber containing fuel and a piston displaceable in the working chamber to discharge fuel therefrom to an inlet passage of the carburetor. A sleeve is secured to the carburetor housing at one end of the working chamber and the piston is slidably guided by the sleeve for movement into and out of the chamber. A sealing ring adjoins the sleeve and includes a free sealing lip directed into the chamber and sealingly bearing against the piston. In order to vary the amount of fuel delivered to the inlet passage for a given stroke of the piston, a piston and sleeve of different diameter are employed while the linkage mechanism between the throttle valve and the piston can remain without change.

Abstract: An actuator for use as part of an electrically heated thermal delay valve (FIG. 1) or switch (FIG. 2) includes a thermally responsive plate (12) the periphery of which is fixed and the central part of which forms a temperature-dependent control element. The actuator also includes a metal carrier plate (9) which has a PTC element (10) mounted on it and which is free to move in a direction normal to its surface between stop abutments, and at least one spring (11) which electrically contacts the PTC element (10) and biases the carrier plate (9) towards the thermally responsive plate (9) to ensure that it is constantly in thermal contact with the carrier plate (10). This ensures that a direct thermal contact between the PTC element and the thermally responsive plate is constantly maintained which results in consistently reproducible functions being achieved with the apparatus by virtue of this direct thermal contact. The thermally responsive plate (9) may be biased towards the carrier plate (10).

Abstract: The ratio air:fuel with a mixture fed to an internal combustion engine is maintained constant independent of the condition of said internal combustion engine in that the mixture is fed supercritically and the air subcritically into a by-pass line bypassing the main choke.

Abstract: An arrangement for indicating the on-going fuel consumption of an operating internal combustion engine in a motor vehicle having a multi-stage transmission. An engine operating parameter indicative of the quantity of fuel being supplied to the engine per engine revolution, is sensed or detected, and a signal representative of the sensed parameter is transmitted to an indicating instrument. The signal is modulated, furthermore, as a function of the currently engaged stage of the transmission. The modulating action may be carried out by a pressure transducer and the signal may be transmitted through a passage connecting the output of the transducer with the indicating instrument. The sensing procedure may be carried out through another passage connecting an input of the transducer with the intake manifold of the engine downstream of the throttle valve.

Abstract: A pneumatically actuated adjusting device, particularly for throttle flap adjustment on mixture-compressing combustion engines, with a diaphragm held between a housing upper portion and a housing lower portion. This diaphragm forms a vacuum-charged working chamber with the housing upper portion. With the housing lower portion it forms a chamber open to ambient atmosphere. A guide bushing projects from the housing upper portion on the atmosphere vented side of the diaphragm and is rigidly connected to it. The diaphragm is also rigidly connected to two concentric spaced diaphragm plate pairs. The outer diaphragm plate pair is connected to a pipe moving inside the guide bushing. This pipe has one or several recesses, with a ball in every recess. Indentations in the guide bushing have diameters corresponding to the ball diameter, with the depth determining the stroke of the first adjustment stage. The inner diaphragm is rigidly connected to a control piston inside the pipe. This control piston has a recess.

Abstract: A fuel-air mixture arrangement with an air-compressing supercharger for a combustion engine with continuous fuel injection into the intake pipe which holds an air quantity meter, a pivotal ram flap and a throttle flap are arranged behind each other. The air quantity meter, depending on its deflection, actuates a fuel metering unit. The fuel metering proceeds at constant pressure drop in the fuel. This pressure drop can be varied depending on certain coefficients, and the pressure drop on a valve is varied by a control pressure valve to which controlling variables are applied. The set pressure drop at the metering cross sections of the fuel metering units is kept constant by the valve operated by the control pressure valve. The air quantity meter is located downstream of the air compressing supercharger and the control pressure valve receives the supercharger air pressure prevailing upstream of the throttle flap via a diaphragm unit.

Abstract: A carburetor for internal combustion engines with a fuel-carrying main injection system discharging upstream from an arbitrarily actuated main throttle into the intake duct. An idling mixture duct discharges downstream of this main throttle via an arbitrarily adjustable throttle cross section. From the idling mixture duct, a transition opening leads to the intake duct whose exit cross section upon opening the main throttle away from the idling position shifts from the intake duct section upstream of the main throttle to the downstream section. An auxiliary duct for adding further mixture connects the idling duct with the exit opening. The cross section of the auxiliary duct is regulated by a screw and the auxiliary duct has a ball retaining valve.

Abstract: A carburetor for internal combustion engines with an acceleration pump whose pump chamber is connected to the float chamber by a suction duct having a suction valve. The pump chamber also is connected to the intake line section upstream of the throttle by a delivery duct having a pressure valve and a calibrated injection opening. The acceleration pump has a displacement member which is actuated via a linkage by a lever depending on the throttle position. The pump chamber has a flow duct, leading to the float chamber and having a cross section adjustable by means of a screw, and a second adjustable flow duct whose inlet has a valve actuated by the throttle position. The valve may have a spring which presses a closure member, held in a diaphragm, against the inlet overcoming the force of the fuel pressure. This spring also presses a plunger against a second lever arm which actuates the acceleration pump.

Abstract: A carburetor for combustion engines with a mixing chamber in the carburetor housing, the mixing chamber being bounded downstream by a randomly actuated mixture throttle and upstream by an air throttle controlling the intake air cross section and actuated by the pressure prevailing in the mixing chamber. A bypass air duct discharges into the center of the mixing chamber and receives the fuel supply. A nozzle pin cooperates with the air throttle and controls the cross section of a fuel jet. Downstream of this jet is another fuel jet whose cross section is controllable as a function of engine operating parameters by means of an analog magnet. The fuel jet controlled by the analog magnet may be the fuel outlet in the bypass air duct, and may be controlled by a nozzle pin through a lever via the analog magnet which is a plunger system. The second fuel jet may be located in a bypass air duct and its cross section may also be controlled by an analog magnet as a function of engine operating parameters.

Abstract: An arrangement for heating the intake pipe of a spark-ignited internal combustion engine with electrical heating elements having a positive temperature coefficient. These heating elements are located on a heating plate which forms part of the intake pipe wall, and are held by a carrier member, rigidly fastened to these elements. This carrier member has several elastic plates, one for each heating element, connected to one central current contact surface. The carrier member is centered in the heating plate and is loaded by a compression spring which is centered in the cover of the housing of the arrangement.

Abstract: An arrangement for regulating supercharger air pressure in a combustion engine operated with exhaust gas supercharge which equipped with an exhaust gas turbosupercharger, consisting of a supercharger and an exhaust gas turbine. The regulating device is a valve controlling an exhaust gas bypass to the exhaust gas turbine. The valve has a pressure unit divided by a diaphragm into two chambers. One side of the diaphragm is charged with supercharger air pressure, and the other side is loaded by a spring. The two chambers are connected by a calibrated opening in the diaphragm. Another valve connects the chamber holding the spring to the atmosphere and has the form of a nonreturn ball valve. The preloading of the spring of the nonreturn ball valve may be adjustable.

Abstract: A thermal timer valve for temperature-dependent operation of accessory devices of a fuel mixture preparation system of a combustion engine. The valve has a membrane chamber acted upon by intake pipe or manifold negative pressure. The membrane is connected to a rod which on one end has a valve closure element and on the other end a piston located in an oil chamber. The oil chamber may have an adjustable overflow channel. A disk check valve may be associated with the piston. Also there may be an overflow channel with a compensation chamber.

Abstract: A carburetor for combustion engines, having upstream of an arbitrarily operated throttle valve, an additional throttling element which is controlled automatically by a membrane unit operated by underpressure of vacuum in accordance with air flow. The additional throttling element controls a fuel jet by means of a needle. The discharge location of the fuel jet is at a point where essentially the same underpressure prevails as in the mixing chamber formed between throttle valve and throttling element. In an enrichment system for the heating phase the fuel jet is controlled by a needle whose variable position is determined by the position of a temperature-sensitive element via a lever, and the fuel quantity for acceleration is varied by means of a second membrane unit. The discharge location of this enrichment system is downstream of the throttling element. The second membrane unit may be actuated by underpressure and may have a pressure chamber closed by a movable membrane loaded by a spring.

Abstract: A diaphragm pump operated by vacuum pressure and having a switching arrangement to control the continuous alternations between the intake stroke caused by vacuum pressure and the working stroke caused during venting by a spring after the end of each stroke. The switching arrangement consists of a crack-open valve between vacuum pressure chamber and a space continually connected to atmosphere, and a plunger, fastened to the diaphragm; the length of the plunger is variable through a spring clutch. The special action of the switching arrangement is based on the fact that the plunger requires a larger force for cracking the valve than afterwards for keeping it open. This is accomplished by having a differential pressure, act in the closing direction on the valve, and eliminating this force after opening, causing the spring-loaded plunger to extend to its full length and to keep open the valve during the entire working stroke of the diaphragm.

Abstract: A fuel quantity distributor in which a continuously operating suction pipe injection device is provided with differential pressure valves corresponding to the number of cylinders arranged about the metering unit. The valves maintain the pressure difference of the fuel constant by the metering unit. The valves have, furthermore, a diaphragm which contacts on one side, the delivered fuel. The other side of the diaphragm is exposed to a control pressure. Each of the differential pressure valves is equipped with one of these diaphragms in the form of a metal diaphragm in the plane of the vave seat. A centering ring with a crushing edge for a seal ring, is located in the distributor housing. The metal diaphragm is fixed relative to the valve seat by this centering ring through the use of a cup spring. The diaphragm, moreover, is located in a carrier within the distributor housing.