NVH technology

Question 1

Minimizing Noise, Vibration and Harshness (NVH) (All)

What’s the Benefit?
Honda endeavors to reduce noise, vibration and harshness (commonly referred to as NVH) in order to enhance the feeling of quality and create a more enjoyable driving experience.

Answer 1

The Feature:

Special attention is paid to quieting the engine, soundproofing the cabin, improving aerodynamics and strengthening the body.

• Honda uses special engine and transmission mounts to help absorb vibration. Many Honda vehicles utilize special subframes that help provide the occupants with a pleasant, quiet ride.
• Some models have a hood blanket to help absorb engine noise.
• All Honda models use vibration-damping insulators and special high-density plastic sheeting.
• Sheeting, insulation and foam placed in large sheetmetal panels and in the door pillars help damp vibrations.
• Expanding foam insulation is injected into body pillars in some models to help control sound transmission.

Question 2

Active Control Engine-Mount System (ACM) (Odyssey, Pilot and Ridgeline)

What’s the Benefit?

This system helps provide a smoother, quieter ride.

Answer 2

The Feature:

Whenever Variable Cylinder Management (VCM) operates in 3-cylinder mode, it creates vibration as the engine rocks on its engine mounts.

To counteract this, a separate ACM control unit monitors the vibrations and operates high-speed solenoids in the front and rear engine mounts that actively cancel each oscillation.
As a result, these vibrations are not transferred to the chassis through the engine mounts and are not felt inside the cabin.

Question 3

Active Noise Cancellation™ (ANC) System (Accord, CR-V, Odyssey, Pilot and Ridgeline)

What’s the Benefit?
This feature provides a quieter cabin, helping to make for greater comfort and less fatigue.

Answer 3

The Feature:

The ANC system eliminates noise caused by both VCM cylinder deactivation and exhaust noise.

The ANC controller uses a front ceiling-mounted microphone and a rear tray microphone to detect any “booming” sound in the cabin associated with cylinder deactivation.
It then emits a mirror “anti-noise” signal through the audio system’s speakers, which effectively cancels those booming sounds and creates a quieter passenger compartment.
ANC is always working, even when the audio system is turned off.

Question 4

Engine Mounts (Accord, Civic, CR-V, Fit, HR-V, Odyssey, Pilot and Ridgeline)

What’s the Benefit?
Insulating the passenger cabin from the engine’s vibration helps enhance passenger comfort.

Answer 4

The Feature:

Honda engines use several different types of advanced engine mounts to control engine vibration.

All front-wheel-drive models have inertial-axis mounts.
Honda engineers used computer analysis to determine their optimum location.
They effectively control engine vibration over a wide range of engine speeds.
An electronically controlled engine mount is used on select automatic transmission-equipped models, which helps damp engine vibrations at varying engine speeds.
Another design found on select models is the Honda liquid-filled engine mount.
This innovative design uses engine vibration to pump fluid from one chamber to another within the mount.
This alters its damping frequency in response to changing engine rpm.