# US 2013/0152584 A1 · Method for reducing sensitivity for engine scavenging > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0152584 A1 - Document ID: US20130152584A1 - Status: Published application - Kind: A1 - Application number: 13/327,668 - Filed: 2011-12-15 - Published: 2013-06-20 - Earliest claimed: 2011-12-15 - Assignees: Ford Global Technologies, LLC - Inventors: Mrdjan J. Jankovic; Amey Y. Karnik - Web page: https://patentgrep.com/patent/US20130152584A1 ## CPC - F02D 41/1456: {with sensor output signal being linear or quasi-linear with the concentration of oxygen} - F02D 37/02: one of the functions being ignition - F02D 41/0002: {Controlling intake air} - F02D 41/18: by measuring intake air flow - F02P 5/1502: {using one central computing unit} - F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)} - F02D 2041/001: {for engines with variable valve actuation} - Y02T 10/12: Improving ICE efficiencies - Y02T 10/40: Engine management systems - 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) - F02P: IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES ({anti-pollution means for internal-combustion engines F02B17/00}; specially adapted for rotary-piston or oscillating-piston engines F02B53/12; {ignition of gas turbine plants F02C7/26; ignition of jet propulsion plants F02K9/95; starting of combustion engines F02N9/00}; ignition of combustion apparatus in general, glowing plugs F23Q; measuring of physical variables in general G01; controlling in general G05; data processing in general G06; electrical components in general see Section H; {ignition coils H01F38/12}; sparking plugs H01T13/00) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method for correcting a total cylinder air flow during scavenging by way of an oxygen sensor is disclosed. Additionally, cylinder trapped air amount and cylinder scavenging air amount are adjusted based on the corrected total cylinder air flow. The approach may reduce sensitivity between cylinder air flow estimates and fuel supplied for combustion. ## Claims ### Claim 1 A method for operating an engine, comprising: adjusting a first actuator in response to an cylinder scavenging air amount, the cylinder scavenging air amount corrected via an oxygen sensor; and adjusting a second actuator in response to a cylinder trapped air amount, the cylinder trapped air amount corrected via the oxygen sensor apart from the cylinder scavenging air amount. ### Claim 2 (depends on 1) The method of claim 1, where the first actuator is a valve timing actuator and where the second actuator is an ignition coil providing spark to the engine. ### Claim 3 (depends on 1) The method of claim 1 where the first actuator is an electronically controlled throttle and the second actuator is a turbine waste-gate. ### Claim 4 (depends on 1) The method of claim 1, where the cylinder scavenging air amount and the cylinder trapped air amount are based on a total cylinder air amount. ### Claim 5 (depends on 1) The method of claim 1, further comprising adjusting an engine indicated torque based on a corrected cylinder trapped air amount. ### Claim 6 (depends on 1) The method of claim 1, further comprising determining presence of cylinder scavenging air in response to engine speed, MAP, valve overlap, and turbocharger waste gate position. ### Claim 7 (depends on 6) The method of claim 6, where valve overlap is a duration when intake and exhaust valves of a cylinder are simultaneously open, and where cylinder scavenging air amount and the cylinder trapped air amount are adjusted during an engine operating condition conducive for scavenging. ### Claim 8 A method for operating an engine, comprising: adjusting fuel injection timing in response to a corrected total cylinder air amount flowing through a cylinder during a cycle of a cylinder; adjusting a cylinder trapped air amount based on the corrected total cylinder air amount flowing through the cylinder; adjusting a cylinder scavenged air amount based on the corrected total cylinder air amount flowing through the cylinder; and adjusting a first actuator in response to the cylinder trapped air amount. ### Claim 9 (depends on 8) The method of claim 8, further comprising adjusting an exhaust parameter in response to the cylinder scavenged air amount, and where the cylinder trapped air amount and the cylinder scavenging air amount is adjusted based on output of an oxygen sensor. ### Claim 10 (depends on 9) The method of claim 9, where the exhaust parameter is an exhaust exotherm. ### Claim 11 (depends on 8) The method of claim 8, where the first actuator is an ignition coil, and further comprising adjusting a second actuator in response to the cylinder scavenging air amount, and further comprising adapting exhaust pressure based on a corrected total cylinder air amount. ### Claim 12 (depends on 11) The method of claim 11, where the second actuator is a camshaft phase actuator. ### Claim 13 (depends on 12) The method of claim 12, further comprising increasing intake valve and exhaust valve opening overlap to increase the cylinder scavenging air amount when the cylinder scavenging air amount is less than a desired cylinder scavenging air amount. ### Claim 14 (depends on 8) The method of claim 8, where the corrected total cylinder air amount flowing through the cylinder is corrected via an output of an oxygen sensor. ### Claim 15 A engine operating system, comprising: an engine; an actuator in communication with the engine; a turbocharger coupled to the engine; an exhaust system coupled to the turbocharger, the exhaust system including an oxygen sensor; a controller including instructions for adjusting a total cylinder air amount in response to an output of the oxygen sensor, the controller including additional instructions for providing a corrected cylinder trapped air amount and a corrected cylinder scavenging air amount based on the total cylinder air amount. ### Claim 16 (depends on 15) The engine operating system of claim 15, further comprising additional instructions for adjusting spark timing of a cylinder in response to the corrected cylinder trapped air amount. ### Claim 17 (depends on 15) The engine operating system of claim 15, further comprising additional instructions for adjusting valve timing in response to the corrected cylinder scavenging air amount. ### Claim 18 (depends on 15) The engine operating system of claim 15, further comprising including additional instructions to adjust an estimated exhaust flow. ### Claim 19 (depends on 15) The engine operating system of claim 15, where the engine includes two cylinder banks, where the total cylinder air amount applies to a cylinder of a first cylinder bank, where the controller includes additional instructions for adjusting a total cylinder air amount of a cylinder of a second cylinder bank, and where the controller includes additional instructions for providing a corrected cylinder trapped air amount and a corrected cylinder scavenging air amount based on the total cylinder air amount of the cylinder of the second cylinder bank. ### Claim 20 (depends on 15) The engine operating system of claim 15, further comprising additional instructions for adapting an exhaust pressure parameter based on a corrected total cylinder air amount.