Abstract: Disclosed is an internal combustion engine comprising at least one cylinder and an exhaust manifold in which a catalytic converter, a first exhaust gas probe, and a second exhaust gas probe are disposed. The first exhaust probe is located upstream from the catalytic converter while the second exhaust gas probe is arranged downstream therefrom. A lambda Controller is provided which is configured so as to determine a lambda correction factor in accordance with a first test signal that is assigned to the first exhaust gas probe. A trim controller is provided to which a setpoint value and an actual value of a second test signal allocated to the second exhaust gas probe are fed as a control difference. The trim controller is configured so as to determine a proportionate corrective factor.

Abstract: Disclosed is an internal combustion engine comprising at least one cylinder and an exhaust manifold in which a catalytic converter, a first exhaust gas probe, and a second exhaust gas probe are disposed. The first exhaust probe is located upstream from the catalytic converter while the second exhaust gas probe is arranged downstream therefrom. A lambda Controller is provided which is configured so as to determine a lambda correction factor in accordance with a first test signal that is assigned to the first exhaust gas probe. A trim controller is provided to which a setpoint value and an actual value of a second test signal allocated to the second exhaust gas probe are fed as a control difference. The trim controller is configured so as to determine a proportionate corrective factor.

Abstract: After the start of an internal combustion engine, a check is made to see whether a positive change in a measurement signal is established. A positive change is established if the measurement signal lies below a predetermined threshold value when the internal combustion engine is started. A fault entry is made if, within a predetermined time period, the positive change in the measurement signal, expressed as the difference between the measurement signal when the internal combustion engine is started and a present value of the measurement signal when the time period has elapsed, does not reach an expected value.

Abstract: The total ignition angle ZW(z) of each cylinder z is composed of cylinder-selective values basic ignition angle GZ(z) {determined by engine speed n and load L}, knock adjustment angle KNK(z), in addition to a first adaptation value AD1(z) and a second adaptation value AD2 common to all cylinders. AD1(z) is increased when KNK(z) is greater than a threshold DEC and is reduced when KNK(z) is lower than a threshold INC. The second adaptation value AD2 is formed as a function of the average value {overscore (AD1+L )} of the adaptation values of all cylinders.

Abstract: The total ignition angle ZW(z) of each cylinder z is composed of cylinder-selective values basic ignition angle GZ(z) {determined by engine speed n and load L}, knock adjustment angle KNK(z), in addition to a first adaptation value AD1(z) and a second adaptation value AD2 common to all cylinders. ADl(z) is increased when KNK(z) is greater than a threshold DEC and is reduced when KNK(z) is lower than a threshold INC. The second adaptation value AD2 is formed as a function of the average value {overscore (AD1)} of the adaptation values of all cylinders.

Abstract: A process for monitoring the functioning of an exhaust gas sensor disposed in a mixture-regulating circuit of an internal combustion engine includes outputting either a rich voltage representing a rich mixture composition or a lean voltage representing a lean mixture composition as a function of a composition of a mixture to be supplied to the engine, and using a behavior of the voltages during engine operation as a criterion for evaluating the functioning of the exhaust gas sensor. The temperature of an exhaust gas sensor is ascertained and compared with a temperature threshold value. If the temperature threshold value is exceeded, monitoring is performed to determine if that status is maintained for a predetermined period of time or number of cycles. A value occurring for a rich voltage or a lean voltage is detected and compared with a diagnostic value if the conditions are met. It is concluded that the exhaust gas sensor is superannuated, if the diagnostic threshold is not attained.

Abstract: A method for distinguishing sources of error in a mixture formation or mixture regulating system of an internal combustion engine having an exhaust system with a lambda regulator and a heated lambda sensor is disclosed. A value of a sensor voltage is continuously measured. The value of the sensor voltage is compared with a lower diagnostic limit value and an upper diagnostic limit value. A lambda regulator value of the lambda regulator is varied in an enriching direction to a maximum lambda regulation limit if the lower diagnostic limit value fails to be attained, and the lambda regulator value is varied in a leaning down direction to a minimum lambda regulation limit if the upper diagnostic limit value is exceeded.