42 results about "Harshness" patented technology

A variety of methods and arrangements for reducing noise, vibration and harshness (NVH) in a skip fire engine control system are described. In one aspect, a firing sequence is used to operate the engine in a skip fire manner. A smoothing torque is determined that is applied to a powertrain by an energy storage/release device. The smoothing torque is arranged to at least partially cancel out variation in torque generated by the skip fire firing sequence. Various methods, powertrain controllers, arrangements and computer software related to the above operations are also described.

A controller and a method for use in a vehicle to limit noise, vibration, and harshness (NVH) by controlling torque matching between a first power source and a second power source. A first and a second torque estimate are made for the first power source. The torque matching comprises calculating a correction factor based upon a comparison of the torque estimates made during steady-state operating conditions of the vehicle. The first torque estimate is based on operating parameters for the first power source and the second torque estimate is based on operating parameters for the second power source.

A system and method for reducing image artifacts from a processed image are disclosed. An image enhancing system can be implemented with a memory device, an image region segmenter, an artifact detector, and a filter. The region segmenter may be configured to sub-divide an image frame. Each region may be processed by the artifact detector to identify when an image artifact is present in the region. The identified regions may be forwarded to the filter to smooth the harshness of the picture element discontinuities. The method for reducing image artifacts in a compressed and decompressed image can be broadly summarized by the following steps: receiving picture element data associated with at least one image frame; segmenting the at least one image frame into a plurality of regions in accordance with a first viewer selected imaging parameter; analyzing the plurality of segmented regions to identify regions that contain an image artifact in response to a second viewer selected imaging parameter; processing the identified regions with a filter such that at least one picture element data parameter is adjusted in response to both a third and a fourth viewer selected imaging parameters; and inserting adjusted picture element data values into the at least one image frame.

Cumulative histograms generated based on threshold matrixes with respect to halftone-dot area percentage data of the four plates C, M, Y, K are referred to for thereby determining the existential probability of halftone dots. Then, average colorimetric data are calculated from predetermined colorimetric data with respect to every 2n colors using the area percentage as a weighting coefficient. An anti-aliasing filtering process is effected on the average colorimetric data to produce device-independent image data for a color printer. The cumulative histograms are emphasized and the average colorimetric data are emphasized to accurately reproduce a peculiar pattern such as a rosette image which will appear on a printed document on a proof which is outputted from a low-resolution color printer. A process is provided for changing the halftone-dot area percentage data based on the type (wood-free paper, art paper, or the like) of paper of a print sheet of the printed document and the halftone-dot area percentage data on presensitized plates, when the halftone-dot area percentage data are converted into bit map data for the color printer, for thereby reproducing "impression irregularity" and "harshness" out of the visual irregular qualities of paper.

The invention relates to reducing nosie, vibration and harshness in a variable displacement engine, especially a method for operating an engine of a vehicle. The engine having one or more deactivatable cylinders, the method including controlling the stability of a vehicle in response to vehicle acceleration, and reactivating or deactivating combustion in at least a cylinder in response to vehicle acceleration. The invention can reduce nosie, vibration and harshness in a variable displacement engine, meanwhile, can operating the engine to use less cylinders in a range-widening condition thereby enhancing vehicle fuel efficiency.

A system and method for managing inertial torque reactions on stationary powertrain structure rotate at least one selected engine component and at least one selected drive train component in opposite directions so the rotational inertia of the selected drive train component acts in a direction opposite to that of the rotational inertia of the selected engine component to reduce or eliminate the inertial torque reactions on stationary powertrain structure caused by rotational acceleration and deceleration of powertrain components and improves performance with respect to noise, vibration, and harshness (NVH).

The invention relates to a method for measuring surface harshness of multi-measuring-point floating positioning. A measuring device comprises a mounting basic standard, a supporting and positioning mechanism, a multi-measuring-point mechanism, a power supplying system, a data collecting and analyzing system and a measuring sensor which is connected with the power supplying system and the data collecting and analyzing system, wherein a measuring and mounting basic standard is provided with a plurality of measuring mechanisms with a confirmed position relationship; each measuring mechanism is provided with a displacement measuring sensor; the basic harness data of a measured object is obtained through the relative position relationship of a plurality of measurement points and the surface ofthe measured object, and further the harness data of the surfaces of measured objects with different wavelengths is calculated. The measuring device provided by the invention is flexible and convenient and has simple structure, the system errors of measurement positioning can be eliminated completely, the measuring accuracy is improved effectively, the harness of the surface for the measured object is measured, the device has important application value on the measurement of the smoothness of the surface of the object, and especially has a wide application prospect on the harness detection oftracks.

The invention discloses NVH (noise, vibration and harshness) semi-anechoic room test system and method. The NVH semi-anechoic room test system comprises an anechoic room, a dynamometer chamber, a sound arrester and a sound-proof wall. The anechoic room is used for containing a device to be tested. A test bench base is arranged in the anechoic room, and the device to be tested is fixed on the test bench base. Elastic dampers are disposed between the test bench base and the base floor in the anechoic room. The dynamometer chamber is used for containing a test device. The test device comprises a dynamometer. The dynamometer chamber is provided with a dynamometer bottom plate. The test device is fixed on the dynamometer bottom plate. Elastic dampers are disposed between the dynamometer bottom plate and the base floor in the dynamometer chamber. The sound arrester encloses the device to be tested so as to spatially isolate the anechoic room and the dynamometer chamber and isolate sound. The soundproof wall is provided with a plurality of connecting shafts which penetrate through the soundproof wall in soundproof manner and are used for connecting the test device and the device to be tested for testing. The NVH semi-anechoic room test system can meet the multi-mode test needs and is effective in sound proofing and accurate in test data.

The invention provides an offline automobile gearbox NVH (noise, vibration and harshness) detecting method. A system for the offline automobile gearbox NVH detecting method comprises an offline analyzer, a control unit, a data acquisition system, a loading system, a driving system and a gearbox. The offline automobile gearbox NVH detecting method is characterized in that the offline analyzer performs offline analysis via an advanced order analysis algorithm, and the gearbox is the object for the offline analysis and provided with a vibration noise pickup sensor. The offline automobile gearbox NVH detecting method has the advantages that defects of the prior art are overcome, and efficiency in NVH detection in an offline process of the gearbox can be improved effectively.

The invention relates to a dynamic vibration absorber capable of improving NVH (Noise, Vibration and Harshness) and a matching method thereof. The dynamic vibration absorber comprises a connecting seat and a plurality of mass blocks; the dynamic vibration absorber further comprises a plate spring, a connecting post, and a fastening piece; one end of the plate spring is fixedly connected to the connecting seat, a sliding chute is further formed in the plate spring in the length direction thereof, the connecting post is detachably connected with the mass blocks, one end of the connecting post is arranged inside the sliding chute in a sliding manner along the sliding chute, and the fastening piece is connected with the connecting post and used for fixedly connecting the mass blocks onto the plate spring. The dynamic vibration absorber provided by the invention can ensure that the natural frequency of the dynamic vibration absorber is adjustable by adjusting the weights and the positions of the mass blocks, aiming at different systems of a whole vehicle, a universal dynamic vibration absorber can be available for damp matching, and an optimal scheme for vibration restraining can be found quickly.

A control system for controlling a steering system is provided. The control system includes a first module that selectively determines a gain curve based on a position of a hand wheel of the steering system. A second module determines a motor assist command based on the gain curve.

The present invention is directed to a balance shaft module for a vehicle. In the balance shaft module of the present invention, an intermediate gear is covered by a baffle cover, thus making it possible to prevent air from mixing into the engine oil when an intermediate gear rotates. Further, since an intermediate gear is supported with increased support force by a gear shaft, to the present invention provides a reduction in noise and frictional wear and improves durability while considerably improving the NVH (Noise Vibration Harshness) performance of a vehicle.

Provided is an inverter control system and method for an eco-friendly vehicle, by which overall improvements can be obtained in terms of switching loss, electromagnetic performance, noise-vibration-harshness (NVH) performance, control stability, and so forth, when compared to a conventional case in which one fixed switching frequency and one fixed sampling frequency are used over the entire operation area. To this end, the inverter control method for an eco-friendly vehicle which generates a pulse width modulation (PWM) signal according to a switching frequency and a sampling frequency and controls ON/OFF driving of a switching element, in which a controller changes and sets the switching frequency according to a current motor speed, changes and sets a sampling frequency according to the switching frequency, and controls on/off driving of a switching element according to the switching frequency corresponding to the motor speed and the sampling frequency.

Provided is a method used for a power transmission system possessing a transmission and clutch. The power transmission system is used for a vehicle. The slip of the clutch is adjusted to a target where a magnitude of a sensed parameter of a shaft of the transmission corresponds to a desired noise, vibration, and harshness (NVH) level in the power transmission system. The sensed parameter of the transmission shaft may be one of acceleration, speed, and torque of the transmission shaft. The transmission shaft may be one of the input shaft and output shaft of the transmission.

It is possible to ensure good starting performance and operability of an engine, reduce starting time with improved combustion stability, and improve noise vibration harshness (NVH), regardless of whether the engine is started at low temperature even if a high-pressure fuel pump in a gasoline direct injection (GDI) engine breaks, without using an additional dedicated device.

Engine systems and methods for accomplishing regeneration of a NOx adsorber (28) using in-cylinder post-injection in a way that creates a lean-rich transition (FIG. 3) for regenerating the NOx adsorber while attenuating engine torque output fluctuations during the transition without the necessity of using torque sensing to attenuate the fluctuations.

A vehicle includes an engine with an associated engine-speed sensor, and wheels each having a respective wheel-speed sensor. The vehicle also includes a continuously variable transmission (CVT) coupled to the engine and configured to operate at variable input-to-output ratios. At least one controller is programmed to reduce the operating ratio of the CVT in response to the engine-speed sensor indicating the engine is operating at idle speed and the wheel-speed sensor indicating the velocity is approximately zero. This provides less noise, vibration and harshness in the vehicle due to the reduced ratio that is possible during conditions in which a vehicle launch in that reduced ratio may not be acceptable.

The invention relates to a motor NVH (noise, vibration and harshness) testing system and method based on LabView. The system comprises an industrial control computer with LabVIEW, a data acquisition unit, a sensor and a programmable power supply, wherein the sensor comprises an acceleration sensor, a rotating speed sensor and a noise sensor; the industrial control computer with the LabVIEW is connected with a motor to be detected through the programmable power supply; the acceleration sensor, the rotating speed sensor and the noise sensor are respectively connected with the motor to be detected; and the industrial control computer is respectively connected with the acceleration sensor, the rotating speed sensor and the noise sensor through the data acquisition unit. Compared with the priorart, the motor NVH testing system and method based on LabView has the advantages of low implementation cost, high reliability, high production efficiency and the like.

The invention discloses a spring clamp structure for improving the NVH (Noise, Vibration and Harshness) characteristics of a corrugated pipe of an automobile exhaust system. The spring clamp structure comprises an exhaust system corrugated pipe, wherein the exhaust system corrugated pipe comprises an inner layer flexible joint, a middle layer corrugated pipe and an outer layer mesh; the middle layer corrugated pipe and the outer layer mesh are clamped and fixed into a whole body by the inner layer flexible joint through end rings at the two ends of the inner layer flexible joint; the outer layer mesh is tightly pressed on the middle layer corrugated pipe through a spring clamp which is sleeved on the outer layer of the outer layer mesh. According to the spring clamp structure, the spring clamp structure sleeves on the outer layer mesh, the outer layer mesh is tightly pressed on the surface of the middle corrugated pipe, and two adjacent fixing points for tightly pressing the outer layer mesh and the middle corrugated pipe are kept within 150 mm as much as possible, so that collision of the outer layer mesh and the middle corrugated pipe is prevented from being produced in high-frequency vibration, and abnormal noise produced by the collision is avoided; the spring clamp structure is a simple structure with reliable performance for improving the NVH characteristics of the corrugated pipe of the automobile exhaust system.