# US 2014/0360178 A1 · Method for determining wastegate valve lift > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0360178 A1 - Document ID: US20140360178A1 - Status: Published application - Kind: A1 - Application number: 13/914,386 - Filed: 2013-06-10 - Published: 2014-12-11 - Earliest claimed: 2013-06-10 - Assignees: Ford Global Technologies, LLC - Applicants: Ford Global Technologies, LLC - Inventors: Yan Wang - Web page: https://patentgrep.com/patent/US20140360178A1 ## CPC - F02B 37/183: {Arrangements of bypass valves or actuators therefor} - F02B 37/18: by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere} - F02D 41/0007: {for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12)} - F02D 41/064: {at cold start (F02D41/067 takes precedence)} - F02D 41/1445: {the characteristics being related to the exhaust flow} - F02B 37/10: at least one pump being alternatively {or simultaneously} driven by exhaust and other drive, {e.g. by pressurised fluid from a reservoir or an engine-driven pump} - F02B 39/10: electric - F02D 41/2464: {Characteristics of actuators} - F02D 2200/021: Engine temperature - F02D 2200/0406: Intake manifold pressure - Y02T 10/12: Improving ICE efficiencies - Y02T 10/40: Engine management systems - 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) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Various systems and methods for determining the lift of a wastegate valve are provided. For example, a method comprises determining a relation between an actuator position and a lift of a wastegate valve at engine start-up in a temperature range. The relation may be modified based on a difference between a desired boost level and an actual boost level. ## Claims ### Claim 1 A method, comprising: identifying a relation between an actuator position and a lift of a wastegate valve at engine start-up in a temperature range; and after start-up, modifying the relation based on a difference between a desired boost level and an actual boost level. ### Claim 2 (depends on 1) The method of claim 1, wherein the modifying occurs only at a temperature higher than the temperature range. ### Claim 3 (depends on 1) The method of claim 1 wherein the temperature range is below a warmed-up engine operating temperature, and wherein the temperature range includes engine cold start. ### Claim 4 (depends on 1) The method of claim 1 wherein the relation not learned when outside the temperature range restarts from an idle stop operation. ### Claim 5 (depends on 1) The method of claim 1 wherein the relation yields a decreased lift for a given actuator position at an upper end of the temperature range and yields an increased lift for a given actuator position at a lower end of the temperature range. ### Claim 6 (depends on 2) The method of claim 2, wherein the relation is a transfer function. ### Claim 7 (depends on 1) The method of claim 1, wherein the temperature range extends between 0° C. and 40° C. ### Claim 8 (depends on 1) The method of claim 1, wherein the valve lift is identified based on a pressure differential and exhaust flow. ### Claim 9 (depends on 4) The method of claim 4, wherein the valve lift is further identified based on the actual boost level, the method further comprising adjusting a wastegate to open further in response to actual boost greater than desired, and close further in response to actual boost less than desired after the engine starting operation. ### Claim 10 (depends on 1) The method of claim 1, wherein the relation is modified upon exceeding a time threshold, the relation modified such that a decreased lift is yielded for a given actuator position. ### Claim 11 (depends on 1) The method of claim 1, wherein the relation is modified upon exceeding a temperature threshold, the relation modified such that a decreased lift is yielded for a given actuator position. ### Claim 12 (depends on 1) The method of claim 1, wherein the relation is modified if the difference exceeds a threshold, the relation modified such that the relation yields a decreased lift for a given actuator position at an upper end of the temperature range and yields an increased lift for a given actuator position at a lower end of the temperature range. ### Claim 13 An internal combustion engine, comprising: at least one cylinder; a compression device including a compressor arranged along an intake manifold and a turbine arranged along an exhaust passage; a wastegate arranged along the exhaust passage, the wastegate including a wastegate valve coupled to an actuator via a linkage; and an engine controller including a logic subsystem and a storage subsystem holding instructions thereon executable by the logic subsystem to: determine a relation between a position of the actuator and a lift of the wastegate valve at start-up of the engine in a temperature range; and modify the relation based on a difference between a desired boost level and an actual boost level. ### Claim 14 (depends on 13) The engine of claim 13, wherein the relation is a transfer function. ### Claim 15 (depends on 13) The engine of claim 13, wherein the temperature range extends between 0° C. and 40° C. ### Claim 16 (depends on 13) The engine of claim 13, wherein the valve lift is determined based on a pressure differential and exhaust flow. ### Claim 17 (depends on 16) The engine of claim 16, wherein the valve lift is further determined based on the actual boost level. ### Claim 18 (depends on 13) The engine of claim 13, wherein the relation is modified upon exceeding a time threshold. ### Claim 19 (depends on 13) The engine of claim 13, wherein the relation is modified upon exceeding a temperature threshold or if the difference exceeds a threshold. ### Claim 20 A method, comprising: identifying a relation between an actuator position and a lift of a wastegate valve at engine start-up in a temperature range; and after start-up, modifying the relation based on a difference between a desired boost level and an actual boost level; wherein the relation yields a decreased lift for a given actuator position at an upper end of the temperature range and yields an increased lift for a given actuator position at a lower end of the temperature range.