Abstract: A fuel supply system for mixture-comprising, externally ignited internal combustion engines is proposed, which serves to apportion a fuel quantity corresponding to the induced air quantity. The fuel supply system includes an air flow rate meter disposed in the air intake line which actuates a fuel apportionment valve in accordance with the induced air quantity. The restoring force of the air flow rate meter is effected by a control element which is acted upon by pressure fluid, whereby the control element and the pressure control valve each have an air chamber separated from a fuel chamber by a yielding element and in each fuel chamber the same fuel pressure upstream of the fuel apportionment valve and in each air chamber the same pressure in the air intake line upstream of the air flow rate meter prevails as is also effective downstream of the fuel apportionment valve.

Abstract: A method and apparatus for controlling a Diesel engine by limiting the amount of fuel to be admitted to the engine in dependence on engine speed and on the air mass flow rate. The invention provides a primary set of stored data interrelating these variables. The primary data set is used to generate a set-point value for the position of a movable stop member which limits the mechanical travel of the fuel control rack in the fuel injection pump; the control rack is also subject to the action of a mechanical speed governor. Additional corrections of the maximum amount of fuel are made on the basis of air temperature and fuel temperature. Still further refinements include taking into account exhaust gas temperature and engine starting conditions. The final corrected set-point signal is then compared with the output from a position indicator which is attached to the stop member.

Abstract: A fuel metering control loop which includes an exhaust gas sensor and an integrating controller. In order to operate the system at an air number which may differ from the most stable operating point of the oxygen sensor, the output signal from the controller is deliberately changed so as to override the command signals from the oxygen sensor. In particular, the output signal undergoes a step-change toward a higher or lower value at the times of reversal of sensor potential. Thus, the average value of the air number which the controller effectively maintains is different from the nominal value which would be obtained with direct sensor control. In another embodiment, the ongoing integration process is continued for some time beyond the sensor signal reversal.

Abstract: Associated with the fuel controller of a supercharged diesel engine is a mechanism which limits the maximum fuel quantity in all operational states as defined by engine speed and air flow rate. This mechanism includes a three dimensional cam, displaced in rotation by a first transducer responsive to rpm or air flow rate and further displaced axially by a second transducer responsive to the other of these variables. A cam follower attached to the main fuel control rod of the controller makes contact with and follows the surface of the cam, thereby limiting the maximum fuel quantity admitted to the engine. Special provisions permit an enlarged starting fuel quantity and also permit corrections on the basis of further parameters, such as temperature. Several embodiments are presented.

Abstract: The relative fuel consumption of an internal combustion engine, i.e., the fuel consumption per unit time or unit distance, is determined on the basis of measurements to ascertain the exhaust gas temperature. Based on the existing functional relationship between the exhaust gas temperature and fuel consumption, the measured exhaust gas temperature is combined with a signal related to engine speed and is used to provide a datum related to the fuel consumption per unit time. A transducer which detects the distance traveled by the vehicle is used to control an integrating circuit which generates a signal related to the fuel consumption per unit distance traveled. The signals may be used for visual displays to the operator or automatic control of other engine subsystems, for example exhaust gas recycle systems or fuel supply systems.

Abstract: A fuel injection device for mixture compressing, externally ignited internal combustion engines, which serves to meter the fuel proportional to the intake air and aspirates the air-fuel mixture. The fuel injection device includes an air flow rate meter located downstream of a butterfly valve in the air induction tube. The bearing shaft of the air flow rate meter includes a fuel metering valve which can be activated directly by the air flow rate meter. To correct the air-fuel mixture because of air density downstream of the butterfly valve, the fuel injection device is so arranged, that when the butterfly valve is in its idling and full load positions a rich air-fuel mixture can be regulated, and when the butterfly valve is in a partial load position a lean mixture can be regulated.

Abstract: A control system for the fuel injection mechanism of an internal combustion engine, especially a Diesel engine. In order to adapt the fuel admitted to the engine to exact requirements, a correction is made on the basis of air mass flow rate and fuel temperature. The air mass flow rate is deduced from signals generated by an air temperature sensor and an air pressure sensor while the fuel temperature is taken by a fuel temperature sensor. The two temperature signals are applied to a bridge circuit which feeds a differential amplifier whose output is mixed with the pressure signal. The composite mixed signal is applied to a servo-mechanism to limit the excursion of the fuel control rack of the fuel injection pump. Status indicators generate feedback signals for comparison with set-point signals to provide closed-loop control.

Abstract: For use in association with a fuel mixture preparation system of an internal combustion engine which uses closed-loop control based on exhaust chemistry as determined by an oxygen sensor, there is described a circuit which monitors the operational readiness of the oxygen sensor on the basis of its internal resistance. The measurement takes place in a bridge circuit which is supplied with current whenever the sensor is non-operative but which becomes inactive when the sensor is at normal temperatures. The bridge voltages are fed to a comparator which generates an average output value when the oxygen sensor is not yet ready for operation and this average signal is processed in an integrator for final control of the fuel-air mixture.

Abstract: The fuel mixture of an engine is controlled by a mechanism responsive to the signals from an oxygen sensor located in the exhaust pipe. The oxygen sensor is provided with a heater to permit rapid attainment of normal operating temperatures. The heater is controlled by a switch actuated by a timing circuit. The timing circuit closes the switch whenever the alternating signals from a comparator responsive to sensor signals do not occur, indicating sensor non-operation.

Abstract: A fuel metering valve assembly includes an air flow metering member which actuates the movable part of a fuel metering valve. Depending on the displacement of this movable part, two cooperating openings, a control slot and a shaped control orifice, together define the effective flow cross section for the fuel delivered to the engine. In order to improve the resolution of the path of the moving part of the valve assembly, one of the cooperating openings, e.g. the control orifice, is formed as a triangular opening in a sleeve or bushing surrounding an axially slidable shaft which supports the air flow rate-responsive member. The triangular opening may also be defined within the wall of the shaft. The width of the control slot is defined by a spacer ring between two coaxial partial bushings and one edge of the triangular opening is defined by the oblique line separating two partial sleeves.

Abstract: A continuous fuel injection system for metering out fuel to the induction tube of an internal combustion engine. An air flow metering assembly in the induction tube includes a baffle plate which is set with its plane perpendicular to the air flow vector and is mounted on a shaft which slides axially in bearings. As a result of the air flow, the baffle plate is displaced axially to varying extent and this displacement is opposed by a restoring force provided by pressurized fuel and subject to adjustment on the basis of engine variables. A vaned impeller wheel, mounted on the baffle shaft, causes rotation of the shaft in the bearings, thereby eliminating static friction and preventing hysteresis effects. The centrifugal forces generated by the rotation aid in distributing the fuel and in admixing it with the incoming air.

Abstract: A fuel supply system for an internal combustion engine includes an airflow metering device in the induction manifold which directly actuates a fuel metering valve formed by cooperating parts of the airflow meter bushing and the shaft around which it pivots. A differential pressure valve holds the pressure drop across the fuel metering aperture constant. Bimetallic springs are provided to exert temperature dependent forces on the diaphragm in the differential pressure valve to increase the differential pressure when the engine is cold.

Abstract: An improved throttle valve for use in the suction tube of a mixture compressing, externally ignited internal combustion engine in which the transversely extending shaft of the throttle valve is provided with an elongated aperture, the opening of which is arbitrarily variable by means of a movable valve component associated with a by-pass valve.A reciprocal type valve as well as a rotary type valve are disclosed for controlling the aforesaid aperture with each said last-named valves being associated with electrical heater elements.

Abstract: A fuel metering system for an internal combustion engine has an arbitrarily settable throttle plate which controls the air flow through the induction tube and an air flow responsive valve element, shaped somewhat like a cylindrical sector, which is pivoted inside the induction tube upstream of the throttle plate. The pivoting valve element has a shaft which is surrounded by a bushing. An opening in the bushing is uncovered to varying extent by a control edge on the pivotal shaft so as to meter out fuel in proportion to the angular excursion of the pivoting valve element. The fuel is delivered to the induction tube directly downstream of the pivoting valve element.

Abstract: A fuel injection system for use with internal combustion engines in which is provided an air aspiration line within which is included a fuel valve for the apportionment of a fuel quantity proportional to the air quantity. The fuel valve extends transversely of the air aspiration line and is arranged to include a plurality of communicating passages about which is positioned a perforated carrier body. A sleeve that includes valve members is also arranged to encircle the carrier body and together therewith adapted to control fuel flow and air flow to said engine.

Abstract: A fuel injection system for an internal combustion engine includes an air flow responsive throttle element in the induction tube which is subject to an adjustable elastic restoring force. The throttle element is attached to a bushing which rotates about a pivotal shaft mounted within the induction tube. A control slot in the bushing is covered to varying extent by a control edge on the pivotal shaft so that fuel which enters a groove in the shaft is metered out according to the relative rotation of shaft and bushing. The relative position of the throttle can be adjusted by a pressure cell.

Abstract: The mixture control system of an internal combustion engine which employs an exhaust gas oxygen sensor is provided with circuitry which subjects the output signal from the sensor to comparison with established threshold values to determine the operational readiness of the sensor. When the amplitude of the sensor signal is sufficiently high, indicating proper operational temperature of the sensor, the test signal is turned off and the monitoring is taken over by a circuit which looks for regular alternation of the sensor signal at a sufficiently rapid rate. When the sensor signal is found inadequate for any reason, the closed loop control system is disengaged and the mixture control is provided on the basis of an average sensor voltage supplied by the circuit.

Abstract: This disclosure relates to an improved apparatus for preconditioning of the fuel-air mixture in the induction tube of a mixture compressing and externally ignited internal combustion engine in which the throttle valve is provided with a multiple vaned valve structure that is pivotable about an axis extending transversely of the induction tube.

Abstract: A fuel injection system for an internal combustion engine includes electromagnetic injection valves controlled by a fuel control unit which receives signals from a camshaft actuated switch, a position-dependent throttle transducer and an oxygen sensor. When the oxygen sensor changes output levels, the transmission of this information is delayed, by the action of a switching transistor controlled by a monostable multivibrator, for a period of time equal to the internal time constant of the multivibrator.

Abstract: An exhaust gas recycle valve adjusts the amount of exhaust gas returned to the induction manifold and the degree of opening of the recycle valve is controlled by the main throttle valve. In one embodiment of the invention, an extended throttle shaft carries a set of contact strips and a complementary shaft, coupled to the exhaust gas valve, carries contact pins which cooperate with the contact strips to open or close an electrical connection between a power source and an electric motor. When the strips and the pins are rotated relative to one another, as when the throttle is moved, the motor is energized and adjusts the position of the exhaust gas valve until the relative position of the strips and the pins is again such as to interrupt conduction.