# US 2014/0150760 A1 · Methods and systems for a gas constituent sensor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0150760 A1 - Document ID: US20140150760A1 - Status: Published application - Kind: A1 - Application number: 13/706,074 - Filed: 2012-12-05 - Published: 2014-06-05 - Earliest claimed: 2012-12-05 - Assignees: Ford Global Technologies, LLC - Applicants: Ford Global Technologies, LLC - Inventors: Gopichandra Surnilla; Richard E. Soltis; Jaco Hendrik Visser; Timothy Joseph Clark; David James Scholl - Web page: https://patentgrep.com/patent/US20140150760A1 ## CPC - F02M 26/46: for determining the characteristics of gases, e.g. composition - F02B 47/08: the substances including exhaust gas - F02D 41/005: {according to engine operating conditions} - F02D 41/144: {Sensor in intake manifold} - F02D 41/1456: {with sensor output signal being linear or quasi-linear with the concentration of oxygen} - F02M 35/1038: {for temperature or pressure} - F02M 35/10393: {for characterising a multi-component mixture, e.g. for the composition such as humidity, density or viscosity} - G01N 33/0006: {Calibrating gas analysers} - F02D 2200/0406: Intake manifold pressure - F02M 25/089: {Layout of the fuel vapour installation} - F02M 26/05: High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor - F02M 26/06: Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor - Y02T 10/40: Engine management systems - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract 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. ## Claims ### Claim 1 A method, comprising: based on a gas constituent sensor output and a pressure sensor output, generating a correction while exhaust gas recirculation is off; and adjusting an amount of exhaust gas recirculation based on the gas constituent sensor output and the correction while the exhaust gas recirculation is on. ### Claim 2 (depends on 1) 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 an engine. ### Claim 3 (depends on 2) 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 a turbocharger. ### Claim 4 (depends on 1) The method of claim 1, wherein adjusting the amount of exhaust gas recirculation includes adjusting an amount of high pressure exhaust gas recirculation and low pressure exhaust gas recirculation. ### Claim 5 (depends on 4) 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. ### Claim 6 (depends on 1) The method of claim 1, further comprising generating the correction over a range of turbocharger boost pressure. ### Claim 7 (depends on 1) The method of claim 1, further comprising generating the correction while fuel vapor canister purge is not flowing. ### Claim 8 (depends on 1) The method of claim 1, wherein the gas constituent sensor is an oxygen sensor. ### Claim 9 (depends on 1) The method of claim 1, further comprising adjusting the gas constituent sensor output based on the correction. ### Claim 10 (depends on 1) The method of claim 1, wherein the correction is a pressure correction. ### Claim 11 A method, comprising: while exhaust gas recirculation is off and over a range of boost pressures: generating an intake gas constituent concentration from a gas constituent sensor; and generating an intake pressure from a pressure sensor; and based on the gas constituent concentration and the pressure, generating a correction of the gas constituent sensor; and while the exhaust gas recirculation is on: adjusting subsequent output of the gas constituent sensor based on the correction; and adjusting an amount of exhaust gas recirculation based on the adjusted output of the gas constituent sensor. ### Claim 12 (depends on 11) The method of claim 11, wherein the gas constituent sensor and the pressure sensor are disposed downstream of a high pressure exhaust gas recirculation inlet in an intake passage of an engine. ### Claim 13 (depends on 11) The method of claim 11, wherein adjusting the exhaust gas recirculation includes adjusting an amount of high pressure exhaust gas recirculation and an amount of low pressure exhaust gas recirculation. ### Claim 14 (depends on 13) The method of claim 13, wherein adjusting the amount of high pressure exhaust gas recirculation and the amount of low pressure exhaust gas recirculation includes adjusting a ratio of high pressure exhaust gas recirculation to low pressure exhaust gas recirculation. ### Claim 15 (depends on 11) The method of claim 11, wherein the gas constituent sensor is an oxygen sensor and the gas constituent concentration is oxygen concentration. ### Claim 16 A system, comprising: an engine with an intake passage and an exhaust passage; a turbocharger including a compressor coupled in the intake passage; 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 exhaust gas recirculation inlet and configured to output an intake pressure; and a control system in communication with the sensors, the control system including non-transitory instructions to turn off high pressure and low pressure exhaust gas recirculation and generate a gas constituent sensor correction based on outputs from the gas constituent sensor and the pressure sensor, and to adjust amounts of high pressure and low pressure exhaust gas recirculation based on the gas constituent sensor output and the correction when the high pressure and low pressure exhaust gas recirculation systems are on. ### Claim 17 (depends on 16) The system of claim 16, wherein the gas constituent sensor is an oxygen sensor configured to output an oxygen concentration, and wherein the correction is a pressure correction. ### Claim 18 (depends on 16) The system of claim 16, 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. ### Claim 19 (depends on 16) The system of claim 16, wherein the control system is further configured to vary a boost pressure of the turbocharger while the correction is generated. ### Claim 20 (depends on 16) The system of claim 16, further comprising a fuel vapor canister, and wherein the control system is further configured to turn off purging of the fuel vapor canister while the correction is generated.