# US 9,752,949 B2 · System and method for locating engine noise > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,949 B2 - Document ID: US9752949B2 - Status: Granted - Kind: B2 - Application number: 14/587,434 - Filed: 2014-12-31 - Published: 2016-06-30 - Granted: 2017-09-05 - Earliest claimed: 2014-12-31 - Assignees: General Electric Company - Applicants: General Electric Company - Inventors: Jeffrey Jacob Bizub; Mark James Lemke - Web page: https://patentgrep.com/patent/US9752949B2 ## CPC - G01L 23/221: {for detecting or indicating knocks in internal combustion engines} - F02D 35/027: {using knock sensors} - F02D 41/22: Safety or indicating devices for abnormal conditions {(in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809)} - G01L 23/227: {using numerical analyses} - F02D 2041/228: {Warning displays} - F02D 2200/021: Engine temperature - F02D 2200/025: Engine noise, e.g. determined by using an acoustic sensor - Y02T 10/40: Engine management systems - G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G) - 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 A system includes a controller configured to receive noise signals acquired by at least two knock sensors of a plurality of knock sensors coupled to a reciprocating device. Each noise signal represents a noise signature of the reciprocating device detected at a respective knock sensor. The controller is also configured to determine a location of a coincident noise within the reciprocating device based at least on the received noise signals. ## Claims ### Claim 1 A system, comprising: a controller configured to receive noise signals acquired by at least two knock sensors of a plurality of knock sensors coupled to a reciprocating device at different locations associated with different cylinders of the reciprocating device, each noise signal representing a noise signature of the reciprocating device detected at a respective knock sensor, to detect a presence of a coincident noise based at least on the received noise signals, and to determine, when the coincident noise is present, a location of the coincident noise within the reciprocating device based at least on the received noise signals. ### Claim 2 (depends on 1) The system of claim 1, wherein the controller is configured to utilize sound triangulation to determine the location of the coincident noise within the reciprocating device. ### Claim 3 (depends on 2) The system of claim 2, wherein the at least two knock sensors of the plurality of knock sensors are located on a same plane through the reciprocating device, and the controller is configured to utilize two-dimensional sound triangulation to determine the location of the coincident noise within the reciprocating device. ### Claim 4 (depends on 2) The system of claim 2, wherein the at least two knock sensors of the plurality of knock sensors are located on different planes through the reciprocating device, and the controller is configured to utilize three-dimensional sound triangulation to determine the location of the coincident noise within the reciprocating device. ### Claim 5 (depends on 2) The system of claim 2, wherein the controller is configured to receive a temperature signal representing a temperature of a medium from at least one temperature sensor coupled to the medium that the plurality of knock sensors is coupled to within the reciprocating device, and to determine the location of the coincident noise within the reciprocating device based at least on the temperature signal and the received noise signals. ### Claim 6 (depends on 3) The system of claim 3, wherein the controller is configured to determine the location of the coincident noise within the reciprocating device based at least on the temperature signal, the received noise signals, and a speed of sound in the medium. ### Claim 7 (depends on 1) The system of claim 1, wherein the controller is configured to receive noise signals acquired by the plurality of knock sensors and to compare respective noise signatures received from plurality of knock sensors for matching noise signatures to detect the coincident noise. ### Claim 8 (depends on 7) The system of claim 7, wherein the controller is configured select the at least two knock sensors from the plurality of knock sensors to determine the location of the coincident noise within the reciprocating device based on matching noise signatures within the noise signals received from the at least two knock sensors. ### Claim 9 (depends on 7) The system of claim 7, wherein the controller is configured to utilize joint time frequency analysis on the received noise signals acquired by the plurality of knock sensors to detect the coincident noise. ### Claim 10 (depends on 7) The system of claim 7, wherein the controller is configure to utilize an attack, decay, sustain, release (ADSR) envelope on the received noise signals acquired by the plurality of knock sensors to detect the coincident noise. ### Claim 11 A method of locating a coincident noise within a reciprocating device, comprising: utilizing a reciprocating device controller for: receiving noise signals from a plurality of knock sensors coupled to the reciprocating device at different locations associated with different cylinders of the reciprocating device, wherein each noise signal represents a noise signature of the reciprocating device detected at a respective knock sensor; analyzing the noise signals to detect a presence of the coincident noise within the reciprocating device; and determining, when the coincident noise is present, a location of the coincident noise within the reciprocating device based at least on the received noise signals from at least two knock sensors of the plurality of knock sensors. ### Claim 12 (depends on 11) The method of claim 11, wherein analyzing the noise signals to detect the coincident noise comprises comparing the sampled noise signals from different knock sensors for matching noise signatures to detect the coincident noise and to identify which knock sensors of the plurality of knock sensors detected the coincident noise. ### Claim 13 (depends on 12) The method of claim 12, comprising selecting the received noise signals from the at least two knock sensors from among the knock sensors that detected the coincident noise for determining the location of the coincident noise. ### Claim 14 (depends on 11) The method of claim 11, wherein determining the location of the coincident noise comprises utilizing sound triangulation to determine the location of the coincident noise within the reciprocating device. ### Claim 15 (depends on 14) The method of claim 14, wherein the at least two knock sensors of the plurality of knock sensors are located on a sample plane through the reciprocating device, and utilizing sound triangulation comprises utilizing two-dimensional sound triangulation. ### Claim 16 (depends on 14) The method of claim 14, wherein the at least two knock sensors of the plurality of knock sensors are located on different planes through the reciprocating device, and utilizing sound triangulation comprises utilizing three-dimensional sound triangulation. ### Claim 17 (depends on 14) The method of claim 14, comprising receiving a temperature signal representative of a temperature of the medium that the at least two knock sensors of the plurality of knock sensors are coupled to within the reciprocating device, and determining the location of the coincident noise within the reciprocating device based at least on the received noise signals from at least two knock sensors and the temperature of the medium. ### Claim 18 (depends on 17) The method of claim 17, comprising determining the location of the coincident noise within the reciprocating device based at least on the received noise signals from at least two knock sensors, the temperature of the medium, and a speed of sound in the medium. ### Claim 19 A method of detecting a coincident noise within a combustion engine, comprising: utilizing an engine controller for: receiving noise signals from a plurality of knock sensors coupled to the combustion engine at different locations associated with different cylinders of the combustion engine, wherein each noise signal represents a noise signature of the combustion engine detected at a respective knock sensor; and comparing the received noise signals from different knock sensors of the plurality of knock sensors for matching noise signatures to detect a presence of the coincident noise and to identify which knock sensors of the plurality of knock sensors detected the coincident noise. ### Claim 20 (depends on 19) The method of claim 19, comprising determining a location of the coincident noise within the combustion engine via sound triangulation based at least on the received noise signals from at least two knock sensors of the knock sensors that detected the coincident noise.