Abstract: The internal resistance of a lambda probe is determined by: the application of a clocked direct-current counter voltage to the probe via a series resistor; the measurement of the output voltages with the counter voltage connected and disconnected; and, the calculation of the internal resistance from the measured values and known resistance values.Apart from the components of a conventional arrangement, this method requires only a series resistor and a switch for implementation. Measurement can be carried out at short time intervals without excessively high direct-current voltage loading which affects the service life.The internal resistance measured is compared with a desired resistance and the control deviation determined in this way is used to determine the duty factor for probe heating clocked with fixed frequency.

Abstract: The invention is directed to a method for checking the aging condition of a catalyzer by utilizing a lambda probe rearward of the catalyzer. For a transition from lean to rich which takes place within a pregiven time span, a check is made if an overshoot of the probe signal occurs which exceeds a pregiven amplitude. A conclusion is drawn as to the aging condition of the catalyzer from an overshoot when the latter occurs. Transitions between lean and rich and vice versa take place especially during the transition from overrun operation to controlled operation of the engine. Transitions of this kind have large swings of the signals of the lambda probes and this permits reliable measurements. In contrast, conventional methods operate exclusively when the engine to which the catalyzer belongs is lambda controlled. The relatively small signal amplitudes occurring thereby lead to a signal/noise ratio which is considerably poorer than in the methods according to the invention.

Abstract: The invention relates to a method for determining the performance loss of a catalyzer receiving the exhaust gas of a lambda-controlled internal combustion engine and includes the steps of: measuring lambda values forward and rearward of the catalyzer to obtain forward and rearward lambda values, respectively; when a control oscillation of the forward lambda value makes a transition from rich to lean or from lean to rich, determining if the rearward lambda value makes a transition corresponding to the transition of the forward lambda value, and if this correspondence takes place, then carrying out the following additional steps: determining the gas mass flow flowing through the catalyzer; computing the time integral of the product of the gas mass flow and the forward lambda value; computing the time integral of the product of the gas mass flow and the rearward lambda value; and, as a measure of the performance loss of the catalyzer, utilizing either the difference between the integrals or the quotient of the i

Abstract: A method and an arrangement for controlling the air supply to an internal combustion engine of a motor vehicle are proposed with filtered values being generated for the control of the actuating element position from input values formed in dependence upon operating parameters of the internal combustion engine and/or of the motor vehicle as values to be filtered and in which the speed of change of the actuating element position is variable in accordance with the input of the values to be filtered and the filtered values, in particular their difference, by influencing the filter characteristic and the transmission behavior.

Abstract: An electronic control system for fuel metering in an internal combustion engine includes, inter alia, means for determining a basic injection-quantity signal and a transition compensation signal for adapting the quantity of fuel metered-in in the case of acceleration and deceleration, in which, for the purpose of transition compensation, a wall-film quantity signal and a discharge factor signal (Tk) are formed as a function of load and rotational speed, and the transition compensation signal takes into account both the wall-film quantity signal and the discharge factor signal. The discharge factor signal can either be read from a characteristic map or assume two discrete values. The proposed system serves the purpose of achieving a transitional behavior which is as optimum as possible with respect to the exhaust gas.

Abstract: A method for correcting a measuring error of a hot-film air-mass meter occurring as the result of backflow, in particular for acquiring the air mass of the combustion air of an internal-combustion engine. It is proposed for an errorfree acquisition that the air volume be measured with the hot-film air-mass meter as a first value (23) and further as a second value 24 with a second method for determining air volume (.alpha./n method), which works independently of the hot-film air-mass meter; that the two values (23, 24) be drawn upon alternatively as a valid variable dependent upon the operating ranges determining the measuring reliability; and that in at least one operating range which is free of backflow for a correction signal (K.sub.H) to be extracted from a comparison of the first (23) and the second value (24) and used to correct the second value (24) in operating ranges showing backflow.

Abstract: An electronic system for controlling the fuel injection of an internal-combustion engine based on the load, rotational speed, and temperature, as well as at least an oxygen probe reading in the exhaust pipe. The system determines basic injection-quantity signal as well as a transition-compensation signal to adapt the injection fuel quantity in situations of acceleration and deceleration. The system stores an engine characteristics map for a wall-film-quantity signal, and dividing factors for acceleration and deceleration. The system generates a correction value (Wkor) for the wall-film quantity signal and correction factors (FWS1kor, FWS2kor) for the two dividing factors. Three methods are provided for changing the correction factors in connection with the adaptation and these are based on a direct calculation, based on an estimation of the missing quantity and incremental calculation, and based on an incremental adjustment based on the evaluation of the oxygen-probe voltage.

Abstract: An arrangement for lambda control operates on an internal combustion engine (11) comprising a catalytic converter (12) and a lambda probe (13.v) mounted in front of the catalytic converter and a lambda probe (13.h) mounted behind the catalytic converter. The arrangement integrates by means of an integration means (15) the difference between the actual lambda value measured by the rear probe and the lambda desired value to which controlling is to be effected. The integration value is used as control desired value for a means (16) for lambda control. This arrangement and the associated method make it possible to control to the actually wanted lambda desired value even if the front lambda probe carries out incorrect measurements, for example because of hydrocarbons in the exhaust gas in front of the catalytic converter or, in the case of continuous-action control, faulty linearization of the probe characteristic.

Abstract: A method for simulating the time-dependent trace of the lambda value at the outlet of an exhaust gas catalyzer comprising measuring the air-mass flow inducted by the engine; computing the oxygen flow to the engine; determining the deviation .DELTA..lambda. of the lambda value forward of the catalyzer, the deviation being positive for a lean mixture and negative for a rich mixture; computing the oxygen partial flow flowing into the catalyzer; inputting the oxygen-storage capacity thresholds of the catalyzer; computing the simulated time-dependent trace of the lambda value at the outlet of the catalyzer, and comparing the simulated and the actual lambda values for correction of the thresholds and for an indication of catalyzer deterioration.

Abstract: The invention relates to a method for the continuous lambda control of an internal combustion engine 13 having a catalyzer. The method is carried out by generating a control oscillation FS of pregiven amplitude at least in pregiven operating conditions. This method is based on the recognition that with an increase in amplitude of the control oscillation, the conversion window becomes wider insofar as a maximum amplitude is not exceeded. The conversion window is that range of lambda values wherein the conversion exhibits at least a pregiven quality.

Abstract: The invention is directed to a method for lambda control of an internal combustion engine having a catalyzer and a measuring probe arrangement in front of the catalyzer for emitting a measuring signal and a testing probe arrangement behind the catalyzer for emitting a test signal. The method includes the steps of: forming a ratio between the measuring signal and the test signal at pregiven operating conditions; evaluating said ratio as an estimating quantity for the conversion rate of the catalyzer; and, modifying output values of control parameters in a pregiven controlled manner on the basis of the instantaneous values of said ratio, said output values being applicable for controlling an internal combustion engine having a new catalyzer. This method affords the advantage that it evaluates a catalyzer with the aid of the above-mentioned ratio value and controllably modifies values of control parameters in dependence upon the evaluation ratio.

Abstract: A method as well as an arrangement for monitoring the conversion rate of a catalyzer in the exhaust-gas system of an internal combustion engine is suggested by using a lambda probe upstream and downstream of the catalyzer. An inquiry is made as to whether the individual lambda probe signals exceed specific permissibility ranges and the conclusion drawn as to the conversion rate or the operability of the catalyzer.

Abstract: The invention is directed to a method for the temperature open-loop control and closed-loop control of exhaust gas probes for mixture control systems having several heatable exhaust gas probes. For this purpose, the temperature of one exhaust gas probe is closed-loop controlled in a control loop and the heaters of other exhaust gas probes are open-loop controlled. The closed-loop controlled exhaust gas probe controls the open-loop controlled exhaust gas probes insofar as the actuating variable of the temperature control loop is used as the output value for the temperature open-loop control of the other exhaust gas probes.

Abstract: In a method for lambda value detection, the voltages of the loaded and the unloaded lambda sensor are detected and the internal resistance of the sensor is calculated from these values with the aid of the known value of the load resistance. The value of the internal resistance and the respective value of the voltage of the sensor in the unloaded state serve as input variables for a characteristic field, in which lambda values dependent on values of the internal resistance and of the voltage of the sensor in the unloaded state are stored. The method of the invention affords the advantage that lambda values can be measured very accurately even in the strongly temperature-dependent rich branch of a sensor, for example, of a sensor of the Nernst type. The values thus detected can be indicated by a measuring device or they can be used for exhaust gas control, for example in warming-up or at full load.

Abstract: A fuel injection system for an internal combustion engine of the type wherein the lengths of fuel injection pulses (t.sub.i) are based on engine load signals (TL) developed from a measurement of intake manifold pressure (p) and wherein compensation is provided for the fuel injection signals during transitions between different dynamic operating conditions. Transition compensation for the inlet manifold pressure values representative of engine load is achieved by modifying the pressure values in dependence upon incremental pressure differences (.DELTA.p). The pressure difference values (.DELTA.p) used for this purpose can themselves be modified by other engine-dependent factors (F.sub.1, F.sub.2) when the measured incremental manifold pressure differences (.DELTA.p) exceed predetermined thresholds.

Abstract: In a method for adjusting air and fuel masses for a multi-cylinder internal combustion engine with individual injection for each cylinder, the fuel mass for each injection operation is calculated taking into account the probable intake-pipe pressure during the opening time of the inlet valve. After a change of the accelerator pedal, the throttle flap is only adjusted when the fuel masses decisive for the new throttle-flap position have been calculated and substantially ejected.

Abstract: An open-loop/closed-loop control system for adjusting the air/fuel mixture of an internal combustion engine 12 exhibits an oxygen probe (.lambda.-probe) 14 which is exposed to the exhaust gas of the internal combustion engine 12 and which emits an output signal which represents a measure of the air ratio .lambda.. The control system also has a basic memory 10 for storing fuel-metering times which are used for precontrolling the internal combustion engine 12 to a predetermined air ratio .lambda., a desired-value memory 18 for storing desired values of the air ratio and a closed-loop control device 20 which, in depedence on an output signal of the .lambda.-probe 14 measured and on an associated desired value read out of the desired-value memory 18, corrects the particular fuel-metering time read out of the basic memory 10 and the desired-value memory 18 stores the inverse value of the air ratio .lambda..

Abstract: A control system for controlling the air/fuel ratio in an internal combustion engine 10, in which an oxygen probe (lambda probe) 13 is arranged in the exhaust gas of the internal combustion engine 10, has a control device 12 for continuous control. The actual value of the air ratio lambda is determined via a measured probe output voltage in conjunction with an at least approximately predetermined probe-characteristic relationship 16 between the value of the probe output voltage and the value of the air ratio lambda associated therewith. After forming the difference of desired value and actual value of the air ratio lambda, the air/fuel ratio is controlled on the basis of this difference. Such a control system is used primarily in order to reduce the total emission of the main pollutant components of the exhaust gas of an internal combustion engine.

Abstract: A method of determining the prevailing atmospheric air pressure in a pressure-controlled injection system wherein the intake manifold pressure (Ps), measured when a predetermined load condition of the engine has been detected, is multiplied by a predetermined, preferably speed-dependent factor (K) to provide a value representative of the atmospheric air pressure (Po).

Abstract: An electronic control system for an engine of a vehicle is provided with an idling RPM set-point regulator to deliver at its output a nominal idling speed control signal, and a summer for combining the control signal with a modulating error signal which is generated in response to a detection of a defect in a component part of the vehicle. The modulated nominal control signal causes a corresponding change in the normal running of the engine during idling operation or during reduced load thus signalling to the operator a faulty condition. Additional warning means are provided for generating optical warning signals, and means for generating the modulating error signal to be supplied to the electronic control system when a defect occurs in the warning means.