# US 2013/0158764 A1 · Noise reduction in motor vehicles with a hybrid drive > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0158764 A1 - Document ID: US20130158764A1 - Status: Published application - Kind: A1 - Application number: 13/719,256 - Filed: 2012-12-19 - Published: 2013-06-20 - Earliest claimed: 2011-12-20 - Assignees: Dr. Ing. h.c. F. Porsche Aktiengesellschaft - Inventors: Stefan Wimmer; Wolfgang Held; Heiko Mayer; Thomas Rauner - Web page: https://patentgrep.com/patent/US20130158764A1 ## CPC - B60W 20/17: for noise reduction - B60K 6/52: Driving a plurality of drive axles, e.g. four-wheel drive - B60K 23/0808: {for varying torque distribution between driven axles, e.g. by transfer clutch} - B60W 10/08: including control of electric propulsion units, e.g. motors or generators - B60W 20/10: Controlling the power contribution of each of the prime movers to meet required power demand - B60W 20/19: for achieving enhanced acceleration - Y02T 10/62: Hybrid vehicles - Y10S 903/903: having energy storing means, e.g. battery, capacitor - B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract A method for noise reduction in a motor vehicle that has a hybrid drive and includes an internal combustion engine and at least two electric machines including a first electric machine on a front axle of the motor vehicle and a second electric machine on a rear axle of the motor vehicle. The method includes automatically cutting in the at least two electric machines as a function of a required drive torque and an expected noise emission associated with the required drive torque, in a case of sole operation of the internal combustion engine, so as to reduce the load of the internal combustion engine. Torque distribution is carried out variably between the front axle and rear axle of the motor vehicle. ## Claims ### Claim at position 1 1: A method for noise reduction in a motor vehicle with a hybrid drive, the motor vehicle including an internal combustion engine and at least two electric machines including a first electric machine on a front axle of the motor vehicle and a second electric machine on a rear axle of the motor vehicle, the method comprising: automatically cutting in the at least two electric machines as a function of a required drive torque and an expected noise emission associated with the required drive torque, in a case of sole operation of the internal combustion engine, so as to reduce the load of the internal combustion engine, and carrying out torque distribution variably between the front axle and rear axle of the motor vehicle. ### Claim at position 2 (depends on 1) 2: The method as recited in claim 1, further comprising determining a permissible drive torque associated with a maximum permissible noise emission for a sole operation of the internal combustion engine, and on a basis of the permissible drive torque, automatically establishing respective required drive torques at which the at least two electric machines have to be cut in so as to provide the load reduction of the internal combustion engine. ### Claim at position 3 (depends on 2) 3: The method as recited in claim 2, wherein the permissible drive torque corresponding to the maximum permissible noise emission is stored retrievably in a memory unit of the motor vehicle. ### Claim at position 4 (depends on 2) 4: The method as recited in claim 2, wherein a cut-in of the at least two electric machines for the load reduction of the internal combustion engine is carried out automatically and torque distribution between the front axle and rear axle of the motor vehicle is carried out variably when the maximum permissible noise emission is overshot. ### Claim at position 5 (depends on 1) 5: The method as recited in claim 1, wherein uniform torque distribution between the front axle and rear axle of the motor vehicle is carried out. ### Claim at position 6 6: A control unit for a motor vehicle with a hybrid drive, the motor vehicle having an internal combustion engine and at least two electric machines including a first electric machine on a front axle of the motor vehicle and a second electric machine on a rear axle of the motor vehicle, the control unit comprising: a check unit configured to determine, for a required drive torque, an expected noise emission associated with the required drive torque in the case of sole operation of the internal combustion engine, and to automatically initiate a cutting in of the at least two electric machines if the determined noise emission overshoots a maximum permissible noise emission so as to reduce a load of the internal combustion engine, and to variably carry out a torque distribution between the front axle and rear axle of the motor vehicle. ### Claim at position 7 (depends on 6) 7: The control unit as recited in claim 6, further comprising a computing unit configured to determine a permissible drive torque for the maximum permissible noise emission associated correspondingly with the permissible drive torque for a sole operation of the internal combustion engine and configured to, on the basis of the determined permissible drive torque, automatically establish respective required drive torques at which the at least two electric machines have to be cut in for the load reduction of the internal combustion engine. ### Claim at position 8 (depends on 6) 8: The control unit as recited in claim 6, further comprising a measurement unit connected communicatively to the check unit and configured to continuously measure the noise emission of the motor vehicle and to communicate the respectively measured noise emission to the check unit, the check unit being configured to balance the respectively measured noise emission with the maximum permissible noise emission.