Abstract: Disclosed is a jolt damping circuit for use in fuel metering systems of an internal combustion engine having self-ignition. The jolt damping circuit includes a guide regulator, a device for generating a jolt disturbance signal in dependency on the rotary speed of the engine, and means for combining the output signal from the guide generator and from the jolt disturbance signal generator to produce a desired value setting signal applicable to regulating means for the setting member of a fuel injection pump. The jolt damping circuit is directly connectable into a standard fuel metering system of a motor vehicle.

Abstract: The invention is directed to an arrangement for rapidly adjusting an electromagnetic load associated with internal combustion engines. The output signals of two control systems are combined in a logic circuit such that priority is assigned to one of the two control systems. Dependent on the output signal of the higher-order control system, an evaluation circuit acts on a switch arrangement to thereby suitably influence the signal resulting from the combining operation of the output signals of the two control systems. This arrangement makes it possible to speed up the delivery of the output signal of the higher-order control system to the electromagnetic load which may be an injection valve, for example. The higher-order control system may be a smooth-running control system.

Abstract: The air charge pressure sensor of the control system for a turbo supercharger of an internal combustion engine measures absolute charge pressure, but is used, in the idling condition of the engine, to measure atmospheric pressure, which is stored when the engine is idling for deriving the relative charge pressure for the control system.

Abstract: Disclosed is a system for recirculating exhaust gas in an internal combustion engine having an exhaust gas recirculating conduit which is provided with a valve controlled by two solenoid windings. The system includes a control device including a PID regulator having limitations and cooperating with a three-point switching circuit which exhibits a hysteresis and includes a feedback. The energizing signals for the two solenoid windings are limited between a minimum and a maximum value, whereby the minimum value is defined by the operational sensitivity of the exhaust gas recirculating valve.

Abstract: For a speed governing system for an internal combustion engine with self-ignition, which includes an electromagnetic final control element for influencing the injection quantity and a control unit having a governor for controlling the final control element, provisions are proposed which give the governor a high dynamic amplification in the range of a drop in the engine rpm, a dynamic amplification that drops from a higher value to a lower value in the range of a sudden drop of engine speed, that is, an rpm undercutting, and a flattened governor characteristic in the vicinity of the ends of the control range. A governor of this kind reacts very flexibly to changes in rpm and in particular does not enter a saturated state, and it adjusts to a new control state without disruptive reacceleration phenomena. A governor of this kind is particularly well suited for motor vehicles having a Diesel engine with a relatively large number of cylinders.

Abstract: An apparatus for the load-dependent actuation of an adjusting device of an internal combustion engine, in particular of a throttle valve, of an exhaust gas recirculation line leading to the intake tube of the engine, in which the adjusting device is controlled in accordance with the position of a governor sleeve of a governor of an injection pump filled with fuel. The fuel in the injection pump, which is at an interior pressure (p.sub.1), is utilized as a hydraulic operating medium, and the position of the governor sleeve is ascertained via a self-balancing hydraulic follower piston apparatus. In order to preclude influence on the part of the interior pressure (p.sub.1), which is dependent on the pump rpm, the follower piston apparatus is disposed such that in the balanced status it is exposed on both ends to a pressure corresponding to the interior pressure (p.sub.1).

Abstract: Disclosed a regulating device for a fuel volume adjuster of a self-igniting internal combustion engine. In order to damp jerking movements resulting at different power transmissions, a signal corresponding to the actual rotary speed of the engine is fed back into an electronic regulating circuit. Preferably, the feedback path includes a phase shifter. It is essential that the regulating action of the rotary speed be not delayed by the phase turning shifter. For this purpose, the electronic regulating circuit includes a PI stage and the fed back signal is applied to the regulating circuit only after its I-constituent has become effective.

Abstract: A control device is proposed for regulating the exhaust gas recycling rate in an internal combustion engine with self-ignition in which combustion pressure signals are adjusted directly or indirectly to nominal values dependent on operating characteristics of the engine. In one particular embodiment the combustion pressure signal is differentiated and the frequency of certain occurring amplitude values is adjusted to a nominal value. Owing to the integration of specific combustion processes into the regulation, the device is capable of operating with relatively high precision. It is particularly well suited to compensate for drift phenomena.

Abstract: An electronic control device is proposed for a Diesel fuel metering system, in which at the onset of the starting procedure, a constant fuel quantity is pre-specified at first, and this quantity subsequently increases in steps or in a ramp-like manner. Above a predetermined rpm or starting quantity, an rpm-dependent reduction in quantity takes place, to 90% of the full-load quantity. The open-loop or closed-loop control of the starting quantity ends upon the attainment of a speed of 800 rpm, for example. Both an analog and a computerized realization of the control device are provided, and the control device according to the invention is capable of dispensing with the processing of a temperature signal and can thus dispense with the use of one temperature sensor.

Abstract: The invention is directed to a safety arrangement for an internal combustion engine having self-ignition where, in the sense of an overall system monitoring, specific signals relating to the operating conditions of the internal combustion engine are continuously monitored. These signals are indicative, for example, of the position of the throttle pedal, the computed rack-travel nominal or desired value, and the rotational speed. The monitored signals are processed and a corrected rack-travel nominal value is generated by means of a minimum-value selection circuit. The corrected rack-travel nominal value signal generated in this manner is fed to the rack controller of an EDC unit. At the same time, a deviation in rack travel is determined utilizing the corrected rack travel nominal value in combination with an actual-value signal of the rack travel fed back from the rack-travel sensor.

Abstract: The invention is directed to a safety arrangement for an internal combustion engine with self-ignition such as a diesel engine or the like wherein the operational signals of throttle position, rack travel and rotational speed are continuously monitored and compared with upper and lower limit values for these signals. From this comparison, comparison signals are generated and are combined with each other to provide an overall monitoring of the operation of the diesel engine so that the latter can be shut off when impermissible ranges of operation are present or, if conditions permit, the engine can be switched to an emergency mode of operation so that the motor vehicle may be driven to the next service station for repair.

Abstract: An rpm-to-voltage converter for use in vehicles, in which the converter evaluates the time period between two sequential rpm pulses. This is accomplished by means of a capacitor loading and unloading in an approximately hyperbolic course, so that the inversely proportional relationship between the frequency and the period duration is evaluated for the frequency-to-voltage conversion. The primary characteristics of the converter are a capacitor which can be periodically loaded and unloaded, the exponential voltage course of which during the loading phase is followed by means of an emitter follower, and at the end of the loading procedure the voltage value proportional to the rpm is stored in a memory device.

Abstract: An electronic control system for the fuel quantity of an internal combustion engine having self-ignition is proposed, in which above a predetermined load threshold the increase in fuel quantity is limited and a regulation of exhaust gas temperature is performed. The load threshold is preferably approximately 75% of the full-load value, and it may be dependent on operating characteristics, for instance on the rpm. Depending upon the engine type, it may be useful to regulate not the absolute exhaust gas temperature but rather the difference between the exhaust gas temperature and the temperature of the aspirated air.

Abstract: A method and an apparatus are proposed for controlling the quantity of exhaust gas recirculated from the exhaust gas system of an internal combustion engine to its intake side. The aspirated air quantity is compared with a set-point value formed in accordance with load and rpm, and if the deviation is greater than a minimum amount, control pulses for two magnetic valves are formed, which are triggered alternatively depending upon the polarity of the deviation and which further cause pressure to be delivered from two pressure sources having different pressure levels into the work chamber of a pneumatically functioning adjusting member of a dosing valve for exhaust gas recirculation. The opening duration of a given valve is dependent on the magnitude of the deviation from the set-point, and the valve remains completely open until a counteracting correction takes place if the deviation from the set-point exceeds a predetermined maximum amount.

Abstract: A method and an apparatus are proposed for determining and controlling an exhaust gas recirculation rate in internal combustion engines (Diesel engines), wherein an adjusting member in the exhaust gas recirculation line is adjusted by a regulator in order to attain precise regulation of the exhaust gas quantity recirculated to the aspirated air zone. The regulator is supplied with the exhaust gas temperature (T4) measured at a given time as the load signal for the engine. The comparison value of the regulator is then either an actual value of the exhaust gas recirculation rate, ascertained by means of effective temperature measurements in the intake zone of the engine, or a set-point differential temperature which is produced by means of measuring the aspirated air quantity at a given time and the rpm.

Abstract: A method and apparatus for determining the injected fuel quantity in internal combustion engines having self-ignition are proposed. A performance graph is prepared which includes the injected fuel quantity per stroke in accordance with the injection duration, with the rpm as a parameter. In order to avoid a fictive 0 point, the injection duration is shortened by a predetermined period of time and multiplicatively linked with an rpm signal, while linear rpm correction curves having a dependency of the rpm voltage on the injection duration can be assumed. At the output of an integrator by means of a sample and hold circuit, an injection quantity signal is produced whenever the rpm signal (Un) is supplied to the integrator for the integration process and the duration of the integration is determined on the basis of the injection duration signal (SD).

Abstract: To provide a high output signal, a strain bolt (12, 12a) is screwed (13, 13a) into a tapped bore extending through the housing wall (10), the bolt having a bore (14) extending therethrough, and a region or zone (18) of reduced outer diameter to form a comparatively thin-walled tubular or sleeve-like region which, upon application of fluid, typically liquid fuel pressure within the housing, tends to elongate the portion of the bolt of reduced wall thickness; a piezo-ceramic transducer assembly, preferably formed of two oppositely polarized disks (23, 24) is clamped between an integral head (FIG. 1: 19) or a separate clamping nut (FIG. 2: 31) and the outer wall of the housing, or an abutment surface formed by the upper surface of an intermediately positioned tightening nut (FIG.

Abstract: A device is proposed for drift compensation in fuel metering systems, in which it is not the metered quantity as such which is controlled in closed-loop fashion, but rather only the position of a quantity-determining member. The object of the invention is to maintain or re-obtain the original association between the fuel quantity and the position signal of the quantity-determining member for the purpose of providing a correct indication of the load state existing at a particular time. The drift compensation is intended to be capable of being performed manually, semi-automatically, or automatically, in an additive and/or multiplicative manner. It can furthermore be realized via a preferably rpm-dependent characteristic curve. The various values may be ascertained, for instance, in connection with running-out and running-up tests.

Abstract: An rpm-governing system for an internal combustion engine with auto-ignition is proposed, in which the fuel quantity to be injected at least in the event of idling is subject to the influence of an electromagnetic final control element, in which the control unit for forming the final control element trigger signal includes a regulator having PID behavior and in which the regulation signal is formed in accordance with the actual rpm/set-point rpm deviation. This rpm-governing system has an increase in rpm set-point value, with a retarded drop, this increase in set-point being made to follow up the increase in actual value. The PID regulator furthermore has a non-linear and preferably rpm-dependent P component. The signal end stage includes a pulse length modulator, the output signal of which triggers an electromagnetic final control element while there is a simultaneous current regulating action.

Abstract: A method is described for closed-loop control of the composition of the operating mixture coming to be combusted in an internal combustion engine, wherein operating mixtures are formed in the combustion chambers either simultaneously or sequentially, which differ from one another percentagewise by a predetermined amount of the air number .lambda.. The different exhaust gas compositions resulting from this difference are measured sequentially or simultaneously with the aid of one or two CO sensors and the average operating mixture composition is regulated such that a constant difference is established for the CO content in the exhaust gas. In the use of a quantity of recirculated exhaust gas to influence the operating mixture composition, an optimal composition of the exhaust gases is thereby established.