# US 10,319,357 B2 · System and a method for attenuating sound produced by a vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,319,357 B2 - Document ID: US10319357B2 - Status: Granted - Kind: B2 - Application number: 15/460,916 - Filed: 2017-03-16 - Published: 2018-07-26 - Granted: 2019-06-11 - Earliest claimed: 2017-01-20 - Assignees: Wipro Limited - Applicants: Wipro Limited - Inventors: Vijay Kumar; Thomas Chittakattu Ninan - Web page: https://patentgrep.com/patent/US10319357B2 ## CPC - G10K 11/04: Acoustic filters {; Acoustic resonators} - F01N 1/00: Silencing apparatus characterised by method of silencing - F01N 1/168: {for controlling or modifying silencing characteristics only} - F01N 1/18: having rotary movement - F01N 13/02: having two or more separate silencers in series - F02D 41/021: {Introducing corrections for particular conditions exterior to the engine (conjoint control of vehicle sub-units for propelling the vehicle B60W30/18)} - G01H 17/00: Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the other groups of this subclass - G01J 1/16: using electric radiation detectors (G01J1/20 takes precedence) - F01N 2900/12: said parameters being related to the vehicle exterior - F02D 2200/025: Engine noise, e.g. determined by using an acoustic sensor - F02D 2200/701: Information about vehicle position, e.g. from navigation system or GPS signal - G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - 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) - G01H: MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES - G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N) ## Abstract The present disclosure discloses a system for attenuating sound produced by a vehicle. The system comprises a navigation device associated with the vehicle for determining location details of the vehicle, a sound reduction unit provisioned in an exhaust assembly of the vehicle. The system further includes an Electronic Control Unit (ECU) of the vehicle communicatively coupled to the navigation device and the sound reduction unit. The ECU is configured to detect sound reduction location, by comparing the location details with a pre-defined location data and operate the sound reduction unit to attenuate sound produced by the vehicle when the sound reduction location is detected. The system of the present disclosure, attenuates sound intensity of the vehicle to a desired level by considering surrounding conditions of the vehicle, thus the vehicle noise may be automatically attenuated in the sound sensitive areas or locations. ## Claims ### Claim 1 A system for attenuating sound produced by a vehicle, the system comprising: a navigation device associated with the vehicle for determining location details of the vehicle; a sound reduction unit comprising a plurality of sound filters provisioned in an exhaust assembly of the vehicle; and an Electronic Control Unit (ECU) of the vehicle communicatively coupled to the navigation device and the sound reduction unit, the ECU is configured to: detect a sound reduction location, by comparing the location details with a pre-defined location data; and operate the sound reduction unit, to attenuate sound produced by the vehicle, when the sound reduction location is detected, by selectively aligning at least one sound filter of the plurality of sound filters with exhaust path in the exhaust assembly. ### Claim 2 (depends on 1) The system as claimed in claim 1, wherein a location is identified as the sound reduction location when the determined location corresponds with at least one location in the pre-defined location data. ### Claim 3 (depends on 1) The system as claimed in claim 1, wherein a location is identified as the sound reduction location when the location details corresponds with at least one location in the pre-defined location data, and change in illumination level of light around the vehicle is beyond a pre-defined threshold illumination level. ### Claim 4 (depends on 3) The system as claimed in claim 3 further comprises a light sensor mounted on the vehicle and communicatively coupled with the ECU, wherein the light sensor is configured to sense change in the illumination level of light around the vehicle. ### Claim 5 (depends on 1) The system as claimed in claim 1, wherein a location is identified as the sound reduction location based on the location details corresponding with at least one location in the pre-defined location data, and based on pre-defined time. ### Claim 6 (depends on 1) The system as claimed in claim 1, further comprises a timer communicatively coupled with the ECU to determine current time. ### Claim 7 (depends on 1) The system as claimed in claim 1, wherein the plurality of sound filters provisioned in the exhaust assembly of the vehicle comprises the plurality of sound filters being rotatably mounted in the exhaust assembly of the vehicle. ### Claim 8 (depends on 1) The system as claimed in claim 1 further comprises a microphone communicatively coupled with the ECU, the microphone is positioned at an outlet portion of the exhaust path to measure intensity of sound at the outlet of the exhaust path. ### Claim 9 (depends on 8) The system as claimed in claim 8, wherein the ECU is configured to regulate the sound reduction unit based on a comparison of the intensity of sound measured by the microphone with a pre-defined sound data. ### Claim 10 (depends on 1) The system as claimed in claim 1, wherein the sound reduction unit further comprises: a support member comprising a plurality of provisions, rotatably mounted in the exhaust assembly, wherein, each of the plurality of the provisions is configured to accommodate at least one sound filter of the plurality of sound filters; and an actuator coupled to the support member, wherein the actuator is operable by the ECU, to rotate the support member. ### Claim 11 (depends on 1) The system as claimed in claim 1, wherein each of the plurality of sound filters is configured to attenuate sound to different levels. ### Claim 12 (depends on 1) A vehicle comprising a system as claimed in claim 1. ### Claim 13 A method for attenuating sound produced by a vehicle, the method comprising: determining, by a navigation device, location details of the vehicle; detecting, by an Electronic Control Unit (ECU), a sound reduction location, by comparing the location details with a pre-defined location data; and operating, by the ECU, a sound reduction unit comprising a plurality of sound filters, by selectively aligning at least one sound filter of the plurality of sound filters with exhaust path in an exhaust assembly of the vehicle, to attenuate sound produced by the vehicle when the sound reduction location is detected. ### Claim 14 (depends on 13) The method as claimed in claim 13 further comprises: sensing, by a light sensor, change in illumination level of light around the vehicle; and identifying, by the ECU, the sound reduction location based on the change in the illumination level beyond a pre-defined threshold illumination level and the determined location details corresponding with at least one location in the predefined location data. ### Claim 15 (depends on 13) The method as claimed in claim 13 further comprises: determining, by the ECU, time information from a timer; identifying, by the ECU, the sound reduction location based on the time information corresponding to a pre-defined time and the determined location details corresponding with at least one location in the pre-defined location data. ### Claim 16 (depends on 13) The method as claimed in claim 13 further comprises: measuring, by a microphone, intensity of sound at outlet of an exhaust path; and regulating, by the ECU, the sound reduction unit based on comparing the intensity of sound measured by the microphone with a pre-defined sound data.