# US 2025/0146554 A1 · Method for improving vehicle noise and its control device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0146554 A1 - Document ID: US20250146554A1 - Status: Published application - Kind: A1 - Application number: 18/825,547 - Filed: 2024-09-05 - Published: 2025-05-08 - Earliest claimed: 2023-11-03 - Assignees: Hyundai Motor Company; Kia Corporation - Applicants: Hyundai Motor Company; Kia Corporation - Inventors: Jae Woong Hwang; Si Yoong Kim; Sukil Oh; Seock Chan Kang; HoYoung Jeong; DaeGeon Yoon; Kun Hee Lee; Chang Kook Chae; Sung Baeck Lee - Web page: https://patentgrep.com/patent/US20250146554A1 ## CPC - F16F 15/145: {Masses mounted with play with respect to driving means thus enabling free movement over a limited range} - F16F 15/002: {characterised by the control method or circuitry (control of mechanical oscillations per se G05D19/00)} - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION ## Abstract A method for improving vehicle noise, which improves noise generated from a centrifugal pendulum absorber (CPA) after a vehicle turns off includes collecting real-time driving information according to an operation of the vehicle through a driving information detector, determining whether the idle condition is satisfied based on the real-time driving information; determining whether a transmission P stage is engaged and whether a brake operates when the idle condition is satisfied, and reducing rotation of a CPA mounted turbine applied to a torque converter through at least one of transmission clutch and brake operations at a time when an engine turning-off signal is input in a state of satisfying the transmission P stage engagement or brake operation condition. ## Claims ### Claim 1 A method for improving vehicle noise generated from a centrifugal pendulum absorber (CPA) after a vehicle turns off, the method comprising: collecting real-time driving information according to an operation of the vehicle through a driving information detector; determining whether an idle condition is satisfied based on the real-time driving information; determining whether a transmission P stage is engaged and whether a brake operates when the idle condition is satisfied; and reducing rotation of a CPA mounted turbine applied to a torque converter through at least one of transmission clutch and brake operations at a time when an engine turning-off signal is input in a state of satisfying the transmission P stage engagement or brake operation condition. ### Claim 2 (depends on 1) The method of claim 1, further comprising: after determining whether the transmission P stage is engaged and whether the brake operates, engaging the transmission P stage immediately when the engine turning-off signal is input in a state of not satisfying the transmission P stage engagement and brake operation conditions of the vehicle; and reducing the rotation of the CPA mounted turbine applied to the torque converter through at least one of the transmission clutch and brake operations after the transmission P stage engagement. ### Claim 3 (depends on 1) The method of claim 1, wherein: in the reducing of the rotation of the CPA mounted turbine, a stop time of the turbine rotation is advanced so the rotation of the CPA mounted turbine stops in a same time zone as a turning-off operating time of an engine from a time of recognizing the engine turning-off signal. ### Claim 4 (depends on 3) The method of claim 3, wherein reducing the rotation of the CPA mounted turbine includes performing turbine rotation stop control by operating any one of an under-drive clutch (UD-C), an over-drive clutch (OD-C), and a low-reverse brake (LR-B) of a transmission. ### Claim 5 (depends on 2) The method of claim 2, wherein: in the reducing of the rotation of the CPA mounted turbine, a stop time of the turbine rotation is advanced so the rotation of the CPA mounted turbine stops in a same time zone as a turning-off operating time of the engine from a time of recognizing the engine turning-off signal. ### Claim 6 A control device for improving vehicle noise generated from a centrifugal pendulum absorber (CPA) after a vehicle turns off, the control device comprising: a driving information detector configured to detect real-time driving information required for controlling improvement of CPA noise from various sensors according to an operation of the vehicle; and a controller configured to reduce rotation of a CPA mounted turbine applied to a torque converter through at least one of transmission clutch and brake operations when an engine turning-off signal is input in a state of satisfying an idle condition according to the real-time driving information, and satisfying a transmission P stage engagement or brake operation condition. ### Claim 7 (depends on 6) The control device of claim 6, wherein: the controller is configured to engage the transmission P stage immediately when the engine turning-off signal is input in a state of not satisfying the transmission P stage engagement and brake operation conditions of the vehicle, and then to reduce the rotation of the CPA mounted turbine applied to the torque converter through at least one of the transmission clutch and brake operations. ### Claim 8 (depends on 6) The control device of claim 6, wherein: the driving information detector is further configured to detect real-time driving information including at least one of an engine start state (ON/OFF), an engine RPM, a transmission (TM) state, a TM clutch state, a brake pedal sensor (BPS), and a vehicle speed, and delivers the detected real-time driving information to the controller.