| 摘要 |
An internal combustion engine has an exhaust gas sensor upstream of or in an exhaust gas catalytic converter, and having a measurement signal corresponding to a residual oxygen content of the exhaust gas flowing past the exhaust gas sensor. For operation, an air ratio is specified, a specified forced stimulation is applied thereto, and at least one actuator that influences the mixture is set by appropriately controlling the actuator. In correlation with a rising edge of the forced stimulation, a first maximum value of the air ratio is determined according to the signal profile of the exhaust gas sensor measurement signal during a first measurement duration, and a second maximum value of the air ratio is determined according to the exhaust gas sensor measurement signal during a subsequent second measurement duration. A first sensor characteristic value is determined based on the first and second maximum values. |
| 主权项 |
1. A method for operating an internal combustion engine having an exhaust gas probe arranged in an exhaust system upstream of or in an exhaust gas catalytic converter, the method comprising:
predefining an excess air ratio, applying, by a control device, a predefined forced excitation to the excess air ratio, actuating, by the control device, at least one actuator device according to the predefined excess air ratio with the applied predefined forced excitation, receiving at the control device, from the exhaust as probe, a measurement signal characteristic of a residual oxygen content of the exhaust gas, and in a manner correlating with a rising edge of the forced excitation:
predefining, by the control device, a first measuring time period,determining, by the control device, a first maximum value of the excess air ratio, represented by the measurement signal of the exhaust gas probe, as a function of a signal profile of the measurement signal of the exhaust gas probe during the first measuring time period,predefining, by the control device, a second measuring time period after the first measuring time period, anddetermining, by the control device, a second maximum value of the excess air ratio, represented by the measurement signal of the exhaust gas probe, as a function of a signal profile of the measurement signal of the exhaust gas probe during the second measuring time period, determining, by the control device, a first probe characteristic value as a function of the determined first and second maximum values, and actuating an injection valve as a function of the determined first probe characteristic value. |
