CS249182B1 - Apparatus for compensating the excitation effect of a non-uniform force component of a wheel on an automobile axle - Google Patents

Abstract

The device consists of a rotating cylinder (3) for rolling the wheels of a car (1) and* an accelerometer (2) placed opposite it and a position sensor (4), mounted on the car wheel (1). The position sensor (4) is connected via a third amplifier (12) to a phase comparator (8), connected to a second indicator (7). The accelerometer (2) is connected via a first amplifier (10) to a filter (5), connected via a second amplifier (11) to the first indicator (6) and to the phase comparator (8). For various types of cars, it is possible to connect a control element (9) connected by its outputs to the rotating cylinder (3), filter (5) and second amplifier (11), connected by its input to the rotating cylinder (3). The device for compensating the excitation effect of the wheel force unevenness component on the car axle is mainly applicable in the automotive industry.

Description

249 182

BACKGROUND OF THE INVENTION The present invention relates to a device for compensating for the driving effect of a wheel unevenness component on an axle of an automobile.

Force unevenness of the wheel, caused mainly by the mechanical anisotropy of the tire construction, is manifested by periodically changing force components, oscillating the axle, steering and other parts of the car. Very unpleasant is the steering wheel oscillation, transmitted by the steering mechanism from the rotating wheels, the so-called steering restlessness. It is an external manifestation of the longitudinal resonance oscillation of the wheel group on its elastic suspension, driven by the longitudinal component of the total force unevenness of the wheel. Particularly noticeable is the steering disturbance, excited by the 1st harmonic speed of the wheels, with the resonant peak of conventional cars in the speed range of 100 to 130 km / h.

So far, it has been very much introduced to reduce the driving effect of the wheels. narrow manufacturing tolerance for residual wheel imbalance and tire selection based on the results of the so-called uniformity theft. This method of avoiding driving disquiet is often ineffective and economically disadvantageous. The conventional method of weight balancing a freely rotating tire will alleviate only one component of the driving force. The standard tire uniformity test, carried out on special testers at a speed of 9 km / h, cannot fully reflect the exciting effects of the tire due to the strongly individual, generally undefined speed dependence. This results in strict tire uniformity requirements making the production of tires considerably more expensive.

These drawbacks are overcome by a device for compensating the excitation effect of the force unevenness component of a wheel on an axle of an automobile according to the invention. Its essence lies in the fact that

- 2 consists of a rotating roller for rolling the car wheels and an accelerometer and a position sensor mounted on it, mounted on the car wheel. The position sensor is connected via a third amplifier to a phase comparator connected to the second indicator. The accelerometer is connected via a first amplifier to a filter attached via a second amplifier to a first indicator and a phase comparator.

Furthermore, it is advantageous for the outputs to be connected to the rotating cylinder, the filter and the second amplifier by a control member connected by its input to the rotating cylinder.

The main advantage of the device according to the invention is the possibility to achieve a reduction or suppression of the original and relatively intensive steering unease without removing the wheel from the car.

The invention and its effects are explained in more detail in the description of an exemplary embodiment thereof according to the accompanying drawing, which shows a device for compensating the excitation effect of a force unevenness component of a wheel on an axle of an automobile according to the invention.

The device according to the invention consists of a rotating cylinder 2, which is located below the wheel of the car 1 to which it touches, and an opposing accelerometer 2 and a position sensor 6. The accelerometer 2 and the position sensor 4 are mounted on the car wheel 1. The position sensor 4 is connected via a third amplifier 12 to a phase comparator 8 connected to a second indicator 7. The accelerometer 2 is connected via a first amplifier 10 to a filter 11 connected via a second amplifier 11 to the first indicator 6 and to the phase comparator 8. ·

In the case of using the device according to the invention for different types of cars, a regulating member connected by its input to the rotating cylinder 2 is connected to the rotating cylinder 2 of the filter 2 and the second amplifier 11 by its outputs.

The invention solves compensation for the restlessness of the critical 1st harmonic longitudinal force component of the rolling wheel at speed

- 3,249,182 corresponding to the maximum restlessness of the steering by the centrifugal effect of a commonly used balancing device, the size and position of which are determined according to the measured longitudinal acceleration of the wheel group of the automobile axle 1.

The device makes it possible to measure the longitudinal acceleration at the wheel groups of the car 1 by the accelerometer 2 and the sensor 4 the position of the wheel rolling on the rotating cylinder 2. By the filter 2 ^{and the} phase comparator 8 the first indicator 6 and the second indicator 7 on the wheel of the automobile 1 compensating for the excited acceleration at, wherein the signals are amplified by a first amplifier 10, a second amplifier 11 and a third amplifier 12.

The automobile 1 stands around on a rotating cylinder 2. An accelerometer 2 is mounted horizontally, longitudinally, e.g. magnetically, on the wheel hub 2. A position sensor 4, for example photoelectric, generates a pulse for synchronizing the wheel position. The amplitude 1. of the harmonic longitudinal acceleration at, obtained, for example, by a filter 2 from the signal measured by the accelerometer 2, is indicated by a first indicator 6, the reading of which can be recalculated for a particular type of car 1 directly to the mass m of the compensating weight in grams. Location compensating weight is determined by the angle indicator 7 in the second stage, the instantaneous value of the first harmonic of the longitudinal acceleration and wheel position of the pulse wheel 8 are input to the comparator fáze.Pro use devices for various types of vehicles can include control member JR _T drawing Marked by dashed line to regulate the required roller speed and set the display range.

The device according to the invention can be used predominantly in the automotive industry. ·

Claims (2)

SUBJECT OF THE INVENTION 248 182 A device for compensating the excitation effect of a wheel imbalance component on an axle of an automobile, characterized in that it comprises a rotating roller (5) for rolling the wheels of the automobile (1) and an accelerometer (2) opposite it and a position sensor (4). mounted on the vehicle wheel A, wherein the position sensor (4) is connected via a third amplifier A2 / to a phase comparator / 8 / associated with a second indicator / 1 / and an accelerometer / 2 / connected via a first amplifier AO / with a filter / 5 connected to the first indicator (6) and to the phase comparator (8) via a second amplifier A1. 2. A device for compensating the excitation effect of a wheel imbalance component on an axle of an automobile according to claim 1, characterized in that a control member (9) connected to the rotating cylinder A (»filter) (5) and the second booster (1) is connected. with its rotating cylinder inlet A / · 1 drawing