SU925717A1 - Device for measuring parameters of braking process of wheeled vehicle - Google Patents

Description

(5) DEVICE FOR MEASUREMENT OF PARAMETERS OF THE WHEELED VEHICLE BRAKING PROCESS

I

. The invention relates to equipment for testing the operation of wheel brakes of vehicles, in particular automobiles, and can be used to determine the dynamic parameters of the braking process of wheeled vehicles.

Closest to the proposed device for measuring the parameters of the braking process / wheeled vehicle containing a tachogenerator, amplitude limiter and differentiator connected to the recording device 1.

The disadvantage of this technical solution is the low accuracy of the measurements due to the insufficient accuracy of the display of the dynamics of the wheel braking processes.

The purpose of the invention is to expand the functionality of the device and improve measurement accuracy.

The goal is achieved by the fact that the device is equipped with a frequency detector,

connected to the circuit between the amplitude limiter and the differentiator, wherein the output of the frequency detector is also connected directly to the recording device.

The drawing shows the block diagram of the device.

The device contains a wheel speed sensor t that converts a change in the speed of rotation of the wheel into a change in the frequency of the output sinusoidal voltage, the output of which is connected through an amplitude limit. Tel 2 with the input of the frequency detector 3, the output of which, in turn, is. It is connected to the inputs of the recorder 4 and the differentiator 5, the latter also being connected to the device C. The output of the limiter 2 is also connected to the device k,

The device works as follows.

After acceleration of the transport medium; and its movement with constant

The speed from the output of the sensor 1 is relieved by a sinusoidal voltage whose frequency is constant and proportional to the speed of rotation of the wheel. In this case, a constant amplitude signal is output from the detector 3 detector output, and there is no signal at the output of differentiator 5 When braking the vehicle, the frequency of the signal at the output of sensor 1 decreases sharply. With a frequency detector 3, the frequency characteristics of a change in the rotational speed of the wheel are converted to amnlite and the output of the differentiator 5 is a signal proportional to the deceleration of the wheel of the vehicle. All of these signals are recorded in the device as a function of time. At the moment of blocking (stopping) the wheels at the output of sensors 1 and at the output of detector 3, the signals disappear, and at the output of differentiator 5 a short pulse appears that accurately fixes the moment of its stop. The use of the time scale in the device allows tracing the entire dynamics of the braking process of the vehicle wheel. ,

Using the frequency and amplitude characteristics of the rotation and deceleration of the vehicle wheels in the described device will improve the accuracy of determining the dynamic parameters of the process

wheel braking and extend the functionality of the vehicle's wheel brake testing device.

Claims (1)

Invention Formula A device for measuring parameters of a wheeled vehicle braking process, comprising a series-connected wheel speed sensor, an amplitude limiter and a differentiator connected to the recording device, in addition, the output of the amplitude limiter is connected directly to the recording device, about tl and ch th ua es, in order to expand the functionality of the device and increase the accuracy of measurements, it is equipped with a frequency detector connected to the circuit between the amplitude limiter and the differentiator, and the output of the frequency detector is also connected directly to the recording device. Sources of information taken into account during the examination 1. N. Bukharin, Goal to V.K. Car tests using electrical measurement methods, M.-L., Mashgiz, 1962, ci 227 (cb2-63) (prototype).