Method and system for estimating exhaust pressure using a variable voltage oxygen sensor
A technology of exhaust pressure and oxygen sensor, which is applied in the direction of electric control of exhaust treatment device, diagnostic device of exhaust treatment device, electrical control, etc., and can solve the problems of reducing accuracy
Active Publication Date: 2020-01-17
FORD GLOBAL TECH LLC
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Therefore, engine control based on exhaust pressure estimates during operation outside the window may have reduced accuracy
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[0013] The following description relates to systems and methods for estimating exhaust pressure of exhaust gases in an engine. as in figure 1 As shown in , the engine may include an exhaust gas oxygen sensor located in an exhaust passage of the engine. The oxygen sensor may be a variable voltage (VVs) oxygen sensor, such as in figure 2 The VVs sensor shown in . Thus, the reference voltage of the oxygen sensor can be adjusted between a first lower voltage at which water vapor and carbon dioxide are not decomposed and a second higher voltage at which water and / or carbon dioxide are decomposed. The output of the oxygen sensor may be in the form of a pumping current which may be used to determine the air-fuel ratio of the exhaust gas. The exhaust gas oxygen sensor may have a pressure dependence which may be particularly pronounced when operating at the second, higher voltage. Accordingly, an exhaust gas oxygen sensor may be used to determine the exhaust pressure of exhaust ga...
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The present invention relates to a method and system for estimating exhaust pressure using a variable voltage oxygen sensor, and provides a method and system for estimating engine exhaust pressure based on output from an exhaust oxygen sensor. In one example, a method may include estimating the exhaust gas flow of exhaust gas flowing through an engine exhaust passage based on a difference between a first output of an oxygen sensor disposed in the exhaust passage and a second output of the oxygen sensor. pressure, and then adjust engine operation based on the estimated exhaust pressure. As one example, when operating the sensor in a variable voltage mode, the first and second outputs may be obtained after increasing the reference voltage of the oxygen sensor from a lower first voltage to a higher second voltage.
Description
technical field [0001] The present invention generally relates to methods and systems for operating a variable voltage exhaust gas sensor of an internal combustion engine. Background technique [0002] Measurement and / or estimation of the exhaust pressure of the exhaust flow flowing through the exhaust passage of the internal combustion engine may be used as input in various vehicle control strategies to control engine operation. In one example, the engine may include a dedicated, separate pressure sensor disposed in the engine's exhaust passage upstream of the catalyst to measure exhaust pressure. However, some engines may not include an exhaust pressure sensor. Dedicated exhaust pressure sensors can increase engine system cost and engine system control complexity. In another example, exhaust pressure may be modeled based on alternate engine operating conditions and / or sensor measurements. However, the inventors herein have recognized that these exhaust pressure models c...
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IPC IPC(8): F01N11/00
CPCF01N11/005F01N2900/0416F01N2560/025F01N2900/1406F02D41/123F02D41/1456F02D41/3094F02D41/0025G01M15/104F02D2041/001F02D2200/0418F02D2200/0612F02D21/08F02M26/47F02D41/0235F02D41/145F01N11/002F02D35/0015F02D41/0007F02D41/029F02D41/1402F02D41/1448F02D41/1455F02D41/26F02D41/3011F02D2041/1433F02D2200/0404F02D2200/0406F02D2200/0414F02D2200/0802F02D2200/1002F02D2200/101F02D2200/501
Inventor D·A·马克莱德G·苏尔尼拉R·E·索蒂斯M·麦奎林
Owner FORD GLOBAL TECH LLC