# US 2018/0320646 A1 · Road vehicle with an internal combustion engine and provided with an exhaust noise transmission device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0320646 A1 - Document ID: US20180320646A1 - Status: Published application - Kind: A1 - Application number: 15/958,303 - Filed: 2018-04-20 - Published: 2018-11-08 - Earliest claimed: 2017-04-21 - Assignees: Ferrari S.P.A. - Applicants: FERRARI S.p.A. - Inventors: FRANCESCO NACLERIO - Web page: https://patentgrep.com/patent/US20180320646A1 ## CPC - F01N 1/22: the parts being resilient walls - F01N 1/023: {Helmholtz resonators} - F01N 13/008: {Mounting or arrangement of exhaust sensors in or on exhaust apparatus (sensor arrangements for engine control F02D41/1439)} - F01N 13/10: of exhaust manifolds {(with cooling jacket F01N3/046)} - F01N 1/06: by using interference effect - F01N 1/065: {by using an active noise source, e.g. speakers} - F01N 2490/155: being disposed one after the other in flow direction - F01N 2900/1404: Exhaust gas temperature - F02M 35/1294: {Amplifying, modulating, tuning or transmitting sound, e.g. directing sound to the passenger cabin; Sound modulation} - G10K 11/22: for conducting sound through hollow pipes, e.g. speaking tubes - G10K 2210/12822: Exhaust pipes or mufflers - 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) - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - 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 ## Abstract Road vehicle having: a passenger compartment; an internal combustion engine provided with at least one exhaust duct, which originates from an exhaust manifold and has at least one exhaust gas treatment device; and an exhaust noise transmission device provided with a transmission duct, which originates from the exhaust duct, and with a symposer device, which is arranged inside the transmission duct, is pneumatically insulating and is acoustically permeable; an inlet of the transmission duct being arranged between the exhaust manifold and the exhaust gas treatment device, hence upstream of the exhaust gas treatment device. ## Claims ### Claim 1 A road vehicle (1) comprising: a passenger compartment (5); an internal combustion engine (4) provided with at least one exhaust duct (13), which originates from an exhaust manifold (8) and has at least one exhaust gas treatment device (17); and an exhaust noise transmission device (21), which is provided with at least one transmission duct (22), which originates from the exhaust duct (13), and with a symposer device (23), which is arranged inside the transmission duct (22), is pneumatically insulating and is acoustically permeable; wherein an inlet (24) of the transmission duct (22) is arranged between the exhaust manifold (8) and the exhaust gas treatment device (18), hence upstream of the exhaust gas treatment device (18); the road vehicle (1) being characterized in that the transmission device comprises: a temperature sensor (28) and/or a flow sensor (29) arranged inside the transmission duct (22); and a control unit (30) which, through the temperature sensor (28) and/or the flow sensor (29) diagnoses the presence of exhaust gas leaks in the transmission duct (22). ### Claim 2 (depends on 1) A road vehicle (1) according to claim 1, wherein: the internal combustion engine (4) comprises a turbine (15), which is arranged along the exhaust duct (13) downstream of the exhaust manifold (8); and the inlet (24) of the transmission duct (22) is arranged between the turbine (15) and the exhaust gas treatment device (17), hence downstream of the turbine (15). ### Claim 3 (depends on 1) A road vehicle (1) according to claim 1, wherein: the internal combustion engine (4) comprises a turbine (15), which is arranged along the exhaust duct (13) downstream of the exhaust manifold (8); and the inlet (24) of the transmission duct (22) is arranged between the exhaust manifold (8) and the turbine (15), hence upstream of the turbine (15). ### Claim 4 (depends on 1) A road vehicle (1) according to claim 1, wherein an outlet (25) of the transmission duct (22) is arranged outside the exhaust duct (13) and is oriented towards the passenger compartment (5) or outwards. ### Claim 5 (depends on 1) A road vehicle (1) according to claim 1, wherein an outlet (25) of the transmission duct (22) is arranged inside the exhaust duct (13) and downstream of the exhaust gas treatment device (17). ### Claim 6 (depends on 5) A road vehicle (1) according to claim 5, wherein: the internal combustion engine (4) comprises a silencer (18), which is arranged at the end of the exhaust duct (13) and is provided with an outlet pipe (19) forming the end part of the exhaust duct (13); and the outlet (25) of the transmission duct (22) is arranged downstream of the silencer (18). ### Claim 7 (depends on 6) A road vehicle (1) according to claim 6, wherein the outlet (25) of the transmission duct (22) is arranged in the outlet pipe (19) of the silencer (18). ### Claim 8 (depends on 5) A road vehicle (1) according to claim 5, wherein: the internal combustion engine (4) comprises a silencer (18), which is arranged at the end of the exhaust duct (13) and is provided with an outlet pipe (19) forming the end part of the exhaust duct (13); and the outlet (25) of the transmission duct (22) is arranged between the exhaust gas treatment device (17) and the silencer (18). ### Claim 9 (depends on 1) A road vehicle (1) according to claim 1, wherein the symposer device (23) is entirely made of a metal material. ### Claim 10 (depends on 1) A road vehicle (1) according to claim 1, wherein: the symposer device (23) is at least partially made of a plastic material; and the transmission duct (22) comprises an initial metal part (26), which originates from the exhaust duct (13), and an insulating plastic part (27), which is arranged in series with the initial part (26) immediately upstream of the symposer device (23). ### Claim 11 (depends on 1) A road vehicle (1) according to claim 1, wherein the control unit (30) detects exhaust gas leaks in the transmission duct (22) if the temperature inside the transmission duct (22) increases without a corresponding temperature increase inside the exhaust duct (13) and/or if the flow rate inside the transmission duct (22) is greater than zero. ### Claim 12 A road vehicle (1) comprising: a passenger compartment (5); an internal combustion engine (4) provided with at least one exhaust duct (13), which originates from an exhaust manifold (8) and has at least one exhaust gas treatment device (17); and an exhaust noise transmission device (21) provided with at least one transmission duct (22), which originates from the exhaust duct (13), and with a symposer device (23), which is arranged on the inside of the transmission duct (22), is pneumatically insulating and is acoustically permeable; wherein an inlet (24) of the transmission duct (22) is arranged between the exhaust manifold (8) and the exhaust gas treatment device (17), hence upstream of the exhaust gas treatment device (17); the road vehicle (1) being characterized in that: the symposer device (23) is at least partially made of plastic material; and the transmission duct (22) comprises an initial metal part (26), which originates from the exhaust duct (13), and a plastic insulating part (27), which is arranged in series with the initial part (26) immediately upstream of the symposer device (23).