Method and device for operating an exhaust gas detector
A detector and exhaust gas technology, applied in electrical control, machine/engine, fuel injection control, etc., can solve problems such as detector signal distortion, achieve the effect of reducing harmful substance emissions and fuel consumption
Active Publication Date: 2020-08-11
ROBERT BOSCH GMBH
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Problems solved by technology
Deduced variables, e.g. temperature-independent detector signals are distorted due to deviations of the actual countervoltage from the nominal value of the countervoltage
Method used
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Embodiment Construction
[0028] figure 1 The technical environment in which the method according to the invention according to the first preferred embodiment of the invention can be used for signal conditioning of exhaust gas detectors 1 , 5 is shown schematically using the example of an Otto engine. The internal combustion engine 3 is supplied with air via an air supply 6 and the mass of the air is determined with an air mass measuring device 7 . The air mass sensor 7 can be embodied as a hot film air mass sensor. The exhaust gas of the internal combustion engine 3 is discharged through the exhaust gas duct 2 , wherein an exhaust gas purification device 9 is arranged downstream of the internal combustion engine 3 in the direction of flow of the exhaust gas. Exhaust gas purification device 9 usually includes at least one catalytic converter.
[0029] For controlling the internal combustion engine 3, an engine control unit 4 is provided, which on the one hand supplies the internal combustion engine 3...
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The invention relates to a method for operating an exhaust gas detector in an exhaust gas duct of an internal combustion engine, wherein the exhaust gas detector has at least one heating element for achieving a nominal temperature of a measuring unit in the exhaust gas detector, and wherein , in order to adjust the heating power to stabilize the temperature in the measuring unit, the method includes the following steps: a) Select (11) the operating point of the exhaust gas detector, at which the output voltage of the parallel circuit corresponds to the output voltage integrated in the control The counter voltage of the voltage source in the unit, the parallel circuit is formed by the detector voltage at the output end of the electrical connection part of the measuring unit and the counter voltage of the voltage source integrated in the control unit; b) in Reading (12) the output voltage of the parallel circuit at the operating point selected in step a), wherein the output voltage of the parallel circuit corresponds to the counter voltage of the voltage source integrated in the control unit; and c) The supply voltage read in step b) using (13) is used as the actual back voltage. The invention furthermore provides corresponding devices for carrying out the method. This provides the possibility of operating the exhaust gas detector in such a way that the actual counter-voltage can be determined and possible tolerances accurately taken into account. At the same time, the signal quality of the derived parameters is improved and the diagnostic selectivity of the detector signal is also improved.
Description
technical field [0001] The invention relates to a method for operating an exhaust gas detector in the exhaust gas duct of an internal combustion engine, wherein the exhaust gas detector has at least one heating element for achieving a nominal temperature of a measuring cell in the exhaust gas detector . Furthermore, the invention relates to a computer program, which is configured to carry out each step of the method, and to a machine-readable storage medium, on which the computer program is stored. The invention also relates to a device for carrying out the method. Background technique [0002] In order to reduce emissions in gasoline engine cars, a 3-way catalytic converter is usually used as an exhaust gas purification device, but the exhaust gas purification device can fully convert the exhaust gas only when the air-fuel ratio λ is adjusted with high precision. For this purpose, the air-fuel ratio λ is measured by means of an exhaust gas sensor upstream of the exhaust g...
Claims
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IPC IPC(8): F02D41/14
CPCF02D41/1454F02D41/1489
Inventor M·费
Owner ROBERT BOSCH GMBH