Abstract: The invention relates to a method and device for diagnosing deviations in a single cylinder lambda control in an internal combustion engine having at least two cylinders and an exhaust gas sensor designed as a broadband lambda sensor, wherein a pump current is evaluated by means of a pump cell and the pump current is used at least temporarily for an individual cylinder lambda control. According to the invention, a pump voltage or a pump voltage change is determined via the pump cell in addition to the pump current and the value is transmitted to a diagnosis apparatus. Deviations in the single cylinder lambda control can thus be better diagnosed without additional material expense according to the invention, which provides advantages in particular in respect of tightened rulemaking in on-board diagnosis. A preferred application of the method is the use in internal combustion engines having multi-bank exhaust systems.

Abstract: The invention relates to a method and device for diagnosing deviations in a single cylinder lambda control in an internal combustion engine having at least two cylinders and an exhaust gas sensor designed as a broadband lambda sensor, wherein a pump current is evaluated by means of a pump cell and said pump current is used at least temporarily for an individual cylinder lambda control. According to the invention, a pump voltage or a pump voltage change is determined via the pump cell in addition to the pump current and said value is transmitted to a diagnosis apparatus. Deviations in the single cylinder lambda control can thus be better diagnosed without additional material expense according to the invention, which provides advantages in particular in respect of tightened rulemaking in on-board diagnosis. A preferred application of the method is the use in internal combustion engines having multi-bank exhaust systems.

Abstract: A method for operating an exhaust gas probe, in particular a lambda probe, in the exhaust gas of an internal combustion engine, where at least one heating element for achieving the operating temperature in the exhaust gas probe and determination of the temperature of the exhaust gas probe is performed by measuring the internal resistance. Measurement of the internal resistance occurs by the superimposition of discrete bipolar test pulses that include a pulse and a counter pulse, and by acquisition of the Nernst voltage.

Abstract: A method for setting operating states of an internal combustion engine, in particular an internal combustion engine of a hybrid drive. In addition to the internal combustion engine, the hybrid drive includes at least one electric drive, a hybrid coordinator and a control unit assigned to the internal combustion engine in which functions are implemented. The functions request operating states favorable to their running ability from the hybrid coordinator which performs a commensurate modification of the distribution of power between the internal combustion engine and the at least one electric drive.

Abstract: A method for regulating the fuel/air ratio of a combustion process which is operated alternatingly with excess air and air deficiency, and having at least one catalyst volume in the exhaust gas of the combustion process which stores oxygen when there is excess oxygen in the exhaust gas and gives it off when there is oxygen deficiency, in which method the oxygen charges into the catalyst volume taking place when there is excess air, and the oxygen discharges from the catalyst volume taking place when there is air deficiency determined, and in which the fuel/air ratio is regulated in a first control loop such that the sum of the oxygen charges and oxygen discharges determined in a predefined interval takes on a predetermined value, wherein the combustion process is operated using oxygen excess or oxygen deficiency, respectively, at least until these appear at an oxygen-sensitive Nernst probe downstream from the catalyst volume.

Abstract: A procedure to calculate the Lambda value with a wideband Lambda sensor of an internal combustion engine of a motor vehicle is thereby characterized, in that from the measured pumping electricity and the sensitivities of the wideband Lambda sensor as well as the gas concentration ratios, in the lean operation an oxygen concentration and in the rich operation an oxygen deficit are determined and from these respectively a conclusion is drawn about the Lambda value using the Pischinger Formula.

Abstract: The invention concerns a procedure to determine the oxygen storage capability of an emission control system with an exhaust gas sensor with discrete-level ability disposed in front of the emission control system. If in a period of time before the determination of the oxygen storage capability, the control intervention of the exhaust gas sensor is ascertained, and if this mean value is taken into consideration when calculating the fuel-delivery control phase during the determination of the oxygen storage capability of the emission control system, or if this mean value is used to correct the lambda value used to calculate the amount of oxygen stored, an improved measuring accuracy can be achieved while using a cost effective discrete level sensor.

Abstract: A method for regulating the fuel/air ratio of a combustion process which is operated alternatingly with excess air and air deficiency, and having at least one catalyst volume in the exhaust gas of the combustion process which stores oxygen when there is excess oxygen in the exhaust gas and gives it off when there is oxygen deficiency, in which method the oxygen charges into the catalyst volume taking place when there is excess air, and the oxygen discharges from the catalyst volume taking place when there is air deficiency determined, and in which the fuel/air ratio is regulated in a first control loop such that the sum of the oxygen charges and oxygen discharges determined in a predefined interval takes on a predetermined value, wherein the combustion process is operated using oxygen excess or oxygen deficiency, respectively, at least until these appear at an oxygen-sensitive Nernst probe downstream from the catalyst volume.

Abstract: A method for operating an exhaust gas probe, in particular a lambda probe, in the exhaust gas of an internal combustion engine, where at least one heating element for achieving the operating temperature in the exhaust gas probe and determination of the temperature of the exhaust gas probe is performed by measuring the internal resistance. Measurement of the internal resistance occurs by the superimposition of discrete bipolar test pulses that include a pulse and a counter pulse, and by acquisition of the Nernst voltage.

Abstract: A method for setting operating states of an internal combustion engine, in particular an internal combustion engine of a hybrid drive. In addition to the internal combustion engine, the hybrid drive includes at least one electric drive, a hybrid coordinator and a control unit assigned to the internal combustion engine in which functions are implemented. The functions request operating states favorable to their running ability from the hybrid coordinator which performs a commensurate modification of the distribution of power between the internal combustion engine and the at least one electric drive.

Abstract: A method for diagnosing the dynamic characteristics of a lambda sensor, which is used at least intermittently for a cylinder-individual lambda closed-loop control, which provides for at least one actuating variable of the lambda closed-loop control to be detected and compared to a specifiable maximum threshold, and, if the maximum threshold is exceeded, the dynamic response of the lambda sensor is deemed insufficient with respect to the usability for the cylinder-individual lambda closed-loop control.

Abstract: A circuit configuration for operating a gas sensor is described, including a reference gas space in which an electrode is situated which is supplied with a reference gas pump current to maintain the concentration of the reference gas. A diagnostic system determines a concentration change of the reference gas via a change in the reference pump current and a time-based evaluation of the sensor signal of the gas sensor.

Abstract: A circuit arrangement is proposed to diagnose a heating resistor, which is connected in series with a first switch, which connects the heating resistor to a power source for operation of the heating resistor with a heating current. Provision is made for means to operate the heating resistor with a diagnostic current during a cut-out time of the heating current and for means to acquire a diagnostic voltage as a measurement for the voltages occurring at the heating resistor as well as means to calculate the resistance of the heating resistor, which is taken as a basis for the diagnosis.

Abstract: A method for the dynamic diagnosis of an exhaust gas analyzer probe situated in an exhaust-gas system having at least one exhaust-gas catalytic converter, of an internal combustion engine, a measuring signal (lambda-actual) of the exhaust gas analyzer probe being compared to a setpoint value (lambda-setpoint) as a function of the operating state of the internal combustion engine, and the system deviation being supplied to a controller, which regulates the operating parameters of the internal combustion engine correspondingly, the dynamic diagnosis of the exhaust gas analyzer probe being implemented with a closed control loop, and the deviation from the setpoint value (lambda-setpoint) of the measuring signal (lambda-actual) of a slowing exhaust gas analyzer probe being amplified by the intervention of the controller and the dynamic diagnosis is implemented on the basis of this amplified deviation.

Abstract: The invention concerns a procedure to determine the oxygen storage capability of an emission control system with an exhaust gas sensor with discrete-level ability disposed in front of the emission control system. If in a period of time before the determination of the oxygen storage capability, the control intervention of the exhaust gas sensor is ascertained, and if this mean value is taken into consideration when calculating the fuel-delivery control phase during the determination of the oxygen storage capability of the emission control system, or if this mean value is used to correct the lambda value used to calculate the amount of oxygen stored, an improved measuring accuracy can be achieved while using a cost effective discrete level sensor.

Abstract: A method for controlling and regulating an electrical heating of a probe situated in the exhaust system of an internal combustion engine, a total heating power of the probe being set, and an actual temperature value of the probe being determined by measuring a characteristic parameter, e.g., a resistance. To prevent overheating of the probe ceramics, and therefore over-compensation of aging effects when using such a method, a rated heating power is determined by way of a program map as a function of operating points of the internal combustion engine; a control heating power is determined from the actual temperature value and a new setpoint value in a controller; and the total heating power is formed as the sum of the rated heating power and the control heating power. Moreover, due to this procedure, the regulating reserve of the controller is retained in wide ranges of the operating points. A cost advantage is yielded, because a measuring resistor and an analog-to-digital converter can be omitted.

Abstract: A method for the dynamic diagnosis of an exhaust gas analyzer probe situated in an exhaust-gas system having at least one exhaust-gas catalytic converter, of an internal combustion engine, a measuring signal (lambda-actual) of the exhaust gas analyzer probe being compared to a setpoint value (lambda-setpoint) as a function of the operating state of the internal combustion engine, and the system deviation being supplied to a controller, which regulates the operating parameters of the internal combustion engine correspondingly, the dynamic diagnosis of the exhaust gas analyzer probe being implemented with a closed control loop, and the deviation from the setpoint value (lambda-setpoint) of the measuring signal (lambda-actual) of a slowing exhaust gas analyzer probe being amplified by the intervention of the controller and the dynamic diagnosis is implemented on the basis of this amplified deviation.

Abstract: A procedure to calculate the Lambda value with a wideband Lambda sensor of an internal combustion engine of a motor vehicle is thereby characterized, in that from the measured pumping electricity and the sensitivities of the wideband Lambda sensor as well as the gas concentration ratios, in the lean operation an oxygen concentration and in the rich operation an oxygen deficit are determined and from these respectively a conclusion is drawn about the Lambda value using the Pischinger Formula.

Abstract: A method and an electronic circuit for regenerating an electrical contact are provided in order to remedy the problem of electrical contacts becoming highly resistive over time. Electrical contacts become highly resistive over time, particularly when the contacts are thermally highly stressed and/or exposed to corrosive gases. To remedy this undesired effect and to reestablish the low resistance of the contacts, an electrical regenerating signal is applied to these contacts.

Abstract: A method for diagnosing the dynamic characteristics of a lambda sensor, which is used at least intermittently for a cylinder-individual lambda closed-loop control, which provides for at least one actuating variable of the lambda closed-loop control to be detected and compared to a specifiable maximum threshold, and, if the maximum threshold is exceeded, the dynamic response of the lambda sensor is deemed insufficient with respect to the usability for the cylinder-individual lambda closed-loop control.