An object is to reduce the influence of a hydrogen-ascribable difference between the measurement value of an oxygen sensor and the actual value. An exhaust system includes an oxygen sensor configured to measure the air-fuel ratio of exhaust gas provided in an exhaust passage of an internal combustion engine and including a diffusion rate limiting layer and a controller configured to correct the measurement value of the oxygen sensor in such a way as to increase the measurement value of the oxygen sensor by an amount of correction that is made larger when the responsivity of the oxygen sensor to changes in the air-fuel ratio of the internal combustion engine is high than when it is low in the same operation state of the internal combustion engine.

A signal conditioning module for a wide-band oxygen sensor and methods of installing the same. One signal conditioning module includes an electronic processor, a first electrical coupling, and a second electrical coupling. The first coupling is configured to be coupled to a port of an electrical harness. The power is configured to receive an electrical coupling of a narrow-band oxygen sensor signal for providing power to the narrow-band oxygen sensor. The second coupling is configured to be coupled to the wide-band oxygen sensor. The electronic processor receives power over the first coupling, powers the wide-band oxygen sensor over the second coupling using the received power, receives first data over the second coupling from the wide-band oxygen sensor, converts the first data to second data, and outputs the second data over the first coupling to the electrical harness for transmission to an electronic control unit coupled to the electrical harness.

Provided are an apparatus and a method for compensating for a fuel injection quantity in an engine of a vehicle. The apparatus for compensating for a fuel injection quantity may include: an information collector collecting status information of the vehicle; an oxygen sensor outputting a voltage corresponding to a concentration of oxygen in exhaust gases; a high pass filter (HPF) filtering the output voltage of the oxygen sensor; and a controller generating a reference value on the basis of the status information of the vehicle. In particular, the controller calculates an offset using the reference value and a signal obtained by high-pass filtering the output voltage, and compensates for a fuel injection quantity in each individual cylinder of the engine of the vehicle on the basis of the offset.

Provided are an apparatus and a method for compensating for a fuel injection quantity in an engine of a vehicle. The apparatus for compensating for a fuel injection quantity may include: an information collector collecting status information of the vehicle; an oxygen sensor outputting a voltage corresponding to a concentration of oxygen in exhaust gases; a high pass filter (HPF) filtering the output voltage of the oxygen sensor; and a controller generating a reference value on the basis of the status information of the vehicle. In particular, the controller calculates an offset using the reference value and a signal obtained by high-pass filtering the output voltage, and compensates for a fuel injection quantity in each individual cylinder of the engine of the vehicle on the basis of the offset.

Systems and methods for non-intrusive closed-loop control of internal combustion engines are provided. Systems of the non-intrusive closed-loop control of internal combustion engines include a plurality of engine operating condition sensors, an electronic control unit with a Gaussian process model, and a look-up table. The electronic control unit estimates an MFB50 of the internal combustion engine using the Gaussian process model and with engine operating condition data as input. A desired MFB50 is obtained from the look-up table and a command of a control parameter to a fuel injector for the internal combustion engine is executed by the electronic control unit and as a function of the comparison of the estimated MFB50 and the desired MFB50.

A method to diagnose post air charger compressor icing obstructions without the addition of a post compressor pressure sensor. The method detects when conditions exists for icing to occur and performs at least one icing mitigation strategy when the icing conditions exceed a predetermined icing condition threshold.

Systems and methods for determining fuel delay in a fuel injected engine with cylinders that may be deactivated are presented. In one example, the fuel injection delay is determined via a cylinder firing schedule array when the cylinder firing schedule array is available. The fuel injection delay is determined via weighted average of a fuel injection delay of a present engine cycle and a fuel injection delay of a past engine cycle when the cylinder firing schedule array is not available.

An air-fuel ratio region detection unit, including a first determination voltage higher than a target voltage value indicating the stoichiometric air-fuel ratio, and a second determination voltage lower than the target voltage value, determines that an air-fuel ratio of an engine is within a first rich region when an oxygen sensor output equals or exceeds the first determination voltage, determines that the air-fuel ratio is within a second rich region when the oxygen sensor output equals or exceeds the target voltage value but is lower than the first determination voltage, determines that the air-fuel ratio is within a second lean region when the oxygen sensor output equals or exceeds the second determination voltage but is lower than the target voltage value, and determines that the air-fuel ratio is within a first lean region when the oxygen sensor output is lower than the second determination voltage.

The invention relates to a method and to a regulating device for regulating an air-fuel ratio of an internal combustion engine (10), wherein an exhaust-gas composition of an exhaust gas of the internal combustion engine (10) is determined by virtue of an actual probe signal, which is dependent on the exhaust-gas composition, being detected by means of an exhaust-gas probe (22) and the exhaust-gas composition being determined as a function of the actual probe signal by means of a characteristic curve or a calculation rule, and wherein the determined exhaust-gas composition is compared with a setpoint value or a threshold value, the attainment or exceedance of which triggers a manipulation of the air-fuel ratio supplied to the internal combustion engine (10), wherein, in order to take into consideration at least one disturbance variable which affects the actual probe signal, a safety margin (S) is defined which is applied to the characteristic curve or calculation rule, to the actual probe signal or to the setpoint value or threshold value. It is provided that an evaluation of a present accuracy of the at least one disturbance variable and/or of a present influence of the at least one disturbance variable on the probe signal is performed, and the safety margin (S) owing to the at least one disturbance variable is defined as a function of the evaluation.

An air-fuel ratio region detection unit, including a first determination voltage higher than a target voltage value indicating the stoichiometric air-fuel ratio, and a second determination voltage lower than the target voltage value, determines that an air-fuel ratio of an engine is within a first rich region when an oxygen sensor output equals or exceeds the first determination voltage, determines that the air-fuel ratio is within a second rich region when the oxygen sensor output equals or exceeds the target voltage value but is lower than the first determination voltage, determines that the air-fuel ratio is within a second lean region when the oxygen sensor output equals or exceeds the second determination voltage but is lower than the target voltage value, and determines that the air-fuel ratio is within a first lean region when the oxygen sensor output is lower than the second determination voltage.