A method for active vibration control of a hybrid electric vehicle may include: determining by a controller whether a driving mode enters an idle region based on a motor speed or an engine speed; selecting a reference angle signal based on position information of a motor or an engine when the driving mode enters the idle region; setting up a period of fast Fourier transform (FFT) and performing FFT of the engine speed or the motor speed corresponding to the period of the FFT from the reference angle signal; setting up a reference spectrum according to the engine speed and an engine load; extracting vibration components based on the reference spectrum; summing vibration components according to frequencies and performing inverse FFT; determining an amplitude ratio according to the engine speed and the engine load; and performing active vibration control of each frequency based on the amplitude ratio and motor torque.

A tolerance ring is arranged between an output-side rotary shaft and a rotor shaft. For this reason, even when looseness in a spline fitting portion of the output-side rotary shaft and rotor shaft is not filled, both the output-side rotary shaft and the rotor shaft are held by the tolerance ring so as not to rattle. Therefore, it is possible to reduce tooth hammer noise that occurs in the spline fitting portion.

The present disclosure relates to active vibration control of a hybrid electric vehicle. One form provides a method that may include setting up a period of fast Fourier transform (FFT) and performing FFT of an engine speed or a motor speed corresponding to the period of the FFT from a reference angle signal; setting up a reference spectrum; extracting vibration components to be removed based on information of the reference spectrum; selecting and adding a removal object frequency from the vibration of each frequency and performing inverse FFT; determining a basic amplitude ratio according to the engine speed and the engine load; determining an adjustable rate which decreases an anti-phase torque as a change amount of the engine speed is decreased; and performing active vibration control of each frequency based on the information of the basic amplitude ratio, the adjustable rate, and the engine torque.

The present invention relates to a wheel air gap for a motor vehicle of which according to the invention at least one section of the wheel air gap open air comprises a sound-absorbing material.

A device for analyzing and compensating for automotive noise, vibration and harshness (NVH) is provided. The device includes a microprocessor, a sensor, to measure NVH associated with an automotive system of a vehicle at a frequency and monitor any direct correlation of an environmental condition to a harmonic or resonation problem, the sensor having an output in electrical communication with the microprocessor when vibrations are present at the measured frequency, and a tensioner for adjusting surface tension of a surface of the vehicle to reduce resonance, wherein the tensioner adjusts tension when said microprocessor determines resonance as sensed by the sensor.

A silencer unit for a compressed-air system of a commercial vehicle, in particular a compressed-air brake system of a commercial vehicle, has at least one interface for connection to the brake system, in particular to an outflow duct of the brake system. The silencer unit has at least one air inlet and at least one air outlet, wherein the air outlet in the assembled state and the state of the silencer unit connected to the brake system, has an orientation which is not oriented vertically downward in the direction of the ground. A splashguard element is provided about and/or on the air outlet. Further, a compressed-air system for a commercial vehicle and a commercial vehicle are disclosed having a silencer unit.

An airbag device includes an inflator that is installed in an upper part of a vehicle seat, and that generates gas in an event of a vehicle collision, an airbag to which the gas from the inflator is supplied, and is inflated and deployed from the upper part of the vehicle seat toward a front side of the vehicle seat, and a diffuser that distributes the gas to the airbag. The diffuser includes a connecting portion that is connected to the inflator, and a plurality of branching portions that each branch from the connecting portion and connect to the airbag. The diffuser includes a silencing portion in at least the branching portions. The silencing portion reduces sound pressure of the gas.

This invention concerns a damper used to reduce the running noise of track wheels. It can absorb wheel vibration, reduce oscillation amplitude and reduce the noise radiation of the wheel. The damper has a damping connector and a damping ring which has an open section; the end of the open section has an angled plane; the damping connector has a pipe-shaped object with two locating objects at the both ends; the locating object has a bar which can get into the pipe-shaped object and a wedge-shaped object which matches the angled plane of the end of the open section; inside the pipe-shaped object is a spring which can push out the two locating objects; each locating object has a locating hole which allows a bar to get through from the pipe-shaped object.

The invention relates to a motor-vehicle accessory, comprising a first part and at least one second part pivotal about an axis (a) relative to the first part in at least one bearing assembly (20a, 20b), and the bearing assembly (20a, 20b) comprises a bearing pin (14) on which a bearing sleeve (22) is coaxial to the bearing axis (a), and the bearing pin (14) forms a head (19) with an axial retaining face (30).

The particularity is that of the bearing pin (14) having first coupling formation that engages in a second coupling formation of the bearing sleeve (22) and prevents relative rotation in a pivot direction (u.sub.1, u.sub.2) between the bearing sleeve (22) and the bearing pin (14).

A work vehicle includes a cabin to cover an operator's seat on a traveling body. A cabin frame that constitutes a framework of the cabin includes a pair of left and right front pillars, a pair of left and right rear pillars, a front beam, a rear beam, and side beams. The front beam couples upper end portions of the front pillars to each other. The rear beam couples upper end portions of the rear pillars to each other. Each of the side beams couples to each other upper end portions of each of the front pillars and each of the rear pillars that stand at a front and rear. The rear beam is formed to have a U-shaped cross-section by presswork of a metal plate material.