Various systems and methods are described for an engine system with an exhaust gas recirculation system. In one example method, a correction for a gas constituent sensor is determined based on output from the gas constituent sensor and output from a pressure sensor over a range of boost pressure. Th
Various systems and methods are described for an engine system with an exhaust gas recirculation system. In one example method, a correction for a gas constituent sensor is determined based on output from the gas constituent sensor and output from a pressure sensor over a range of boost pressure. The gas constituent sensor output is adjusted based on the correction, and an amount of exhaust gas recirculation is adjusted based on the adjusted gas constituent sensor output.
대표청구항▼
1. A method for controlling an internal combustion engine, the engine comprising a controller with an electronic storage medium programmed with computer readable data representing non-transitory instructions executable by the controller for performing the method, the method comprising: closing an ex
1. A method for controlling an internal combustion engine, the engine comprising a controller with an electronic storage medium programmed with computer readable data representing non-transitory instructions executable by the controller for performing the method, the method comprising: closing an exhaust gas recirculation valve;adjusting a turbocharger wastegate valve to vary a boost pressure amount from zero boost pressure to a maximum boost level pressure while detecting the boost pressure with a pressure sensor and detecting a gas constituent sensor output;at each of a plurality of detected boost pressures, generating a pressure correction factor based on the detected gas constituent sensor output;fitting the generated pressure correction factors to a curve and determining a quadratic pressure correction equation of the curve;correcting a subsequent gas constituent sensor output via the equation; andopening the exhaust gas recirculation valve, an opening amount of the exhaust gas recirculation valve adjusted based on the corrected gas constituent sensor output. 2. The method of claim 1, wherein the gas constituent sensor and the pressure sensor are positioned downstream of an exhaust gas recirculation inlet in an intake passage of the engine. 3. The method of claim 2, wherein the exhaust gas recirculation inlet is a high pressure exhaust gas recirculation inlet disposed downstream of a compressor of the turbocharger. 4. The method of claim 1, wherein adjusting the amount of exhaust gas recirculation includes adjusting amounts of high pressure exhaust gas recirculation and low pressure exhaust gas recirculation. 5. The method of claim 4, wherein adjusting the amounts of high pressure exhaust gas recirculation and low pressure exhaust gas recirculation includes increasing the amount of high pressure exhaust gas recirculation and reducing the amount of low pressure exhaust gas recirculation. 6. The method of claim 1, further comprising generating the pressure correction factors while a fuel vapor canister purge valve is closed and fuel vapor canister purge is not flowing. 7. The method of claim 1, wherein the gas constituent sensor is an oxygen sensor. 8. A method for controlling an internal combustion engine, the engine comprising a controller with an electronic storage medium programmed with computer readable data representing non-transitory instructions executable by the controller for performing the method, the method comprising: closing an exhaust gas recirculation valve;adjusting a turbocharger wastegate valve to vary a boost pressure amount from zero boost pressure to a maximum level of boost pressure while detecting a plurality of boost pressures with a boost pressure sensor and detecting a plurality of intake gas constituent sensor outputs;determining a quadratic pressure correction equation based on the detected plurality of boost pressures and the detected plurality of intake gas constituent sensor outputs;correcting a subsequent output of the intake gas constituent sensor via the equation; andopening the exhaust gas recirculation valve, an opening amount of the exhaust gas recirculation valve adjusted based on the corrected intake gas constituent sensor output. 9. The method of claim 8, wherein the intake gas constituent sensor and the pressure sensor are disposed downstream of a high pressure exhaust gas recirculation inlet in an intake passage of the engine. 10. The method of claim 8, wherein adjusting the opening amount of the exhaust gas recirculation valve includes adjusting an opening amount of a high pressure exhaust gas recirculation valve and an opening amount of low pressure exhaust gas recirculation valve. 11. The method of claim 10, wherein adjusting the opening amount of the high pressure exhaust gas recirculation valve and the low pressure exhaust gas recirculation valve includes adjusting a ratio of high pressure exhaust gas recirculation to low pressure exhaust gas recirculation. 12. The method of claim 8, wherein the intake gas constituent sensor is an oxygen sensor. 13. A system, comprising: an engine with an intake passage and an exhaust passage;a turbocharger including a compressor coupled in the intake passage for generating a boost pressure;a turbocharger wastegate valve;a high pressure exhaust gas recirculation system and a low pressure exhaust gas recirculation system, the high pressure exhaust gas recirculation system having a high pressure exhaust gas recirculation inlet disposed downstream of the compressor;a gas constituent sensor positioned downstream of the high pressure exhaust gas recirculation inlet and configured to output a gas constituent concentration;a pressure sensor positioned downstream of the high pressure exhaust gas recirculation inlet and configured to output an intake pressure; anda control system in communication with the sensors, the control system including non-transitory instructions executable by a controller to adjust a high pressure exhaust gas recirculation valve to turn off high pressure exhaust gas recirculation, adjust a low pressure exhaust gas recirculation valve to turn off low pressure exhaust gas recirculation, generate a quadratic pressure correction equation based on outputs from the gas constituent sensor and the pressure sensor over a whole boost range from zero boost pressure to a maximum level of the boost pressure, correct a subsequent output of the gas constituent sensor via the equation, and adjust the high pressure exhaust gas recirculation valve and low pressure exhaust gas recirculation valve to adjust amounts of high pressure and low pressure exhaust gas recirculation based on corrected gas constituent sensor output. 14. The system of claim 13, wherein the gas constituent sensor is an oxygen sensor configured to output an oxygen concentration. 15. The system of claim 13, wherein adjusting the amounts of high pressure and low pressure exhaust gas recirculation includes adjusting a ratio of high pressure exhaust gas recirculation to low pressure exhaust gas recirculation. 16. The system of claim 13, wherein the control system is further configured to adjust the wastegate valve to vary the boost pressure of the turbocharger while the equation is generated. 17. The system of claim 13, further comprising a fuel vapor canister, and wherein the control system is further configured to turn off purging of the fuel vapor canister by sending a signal with the controller to close a fuel vapor canister purge valve while the equation is generated.
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이 특허에 인용된 특허 (20)
Stewart,Gregory E.; Shahed,Syed M.; Kolavennu,Soumitri N., Calibration of engine control systems.
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