SU1422057A1 - Bed for measuring tractive-economic parameters of motor vehicles - Google Patents

Abstract

The invention is related to a transport technique for testing wheeled vehicles and can be used in testing vehicles, it allows to extend the functionality by measuring the acceleration time and the after-run of the vehicle. Measurement is carried out using a roller bench equipped with an inductor brake 4 with a control circuit, a tachogenerator 8, a traction characteristics measuring unit 7, as well as a pulse sensor 24 and measuring the acceleration and overrun time of the car. 1 il. jS С /) 4 to ko ate 41

Description

The invention relates to the testing technique of wheeled vehicles,: The purpose of the invention is expansion. functionality by measuring the time of acceleration and run-up of the car.

The drawing shows the structural scheme of the stand.

The stand consists of a platform 1 on which the running rollers 3 are mounted in the spherical bearings i2. The front rollers are connected to an inductor-j brake 4, the stator of which is across the lever 5 is mechanically connected to

by the exporter of used power.

; The reactive moment that occurred during the operation of the induction brake is converted by the transducer 6 into an electrical signal, which is fed to the input of the vehicle traction characteristics measuring unit 7.

A duster frequency sensor; roller 3 — a tachogenerator 8 mounted on a roller axis produces a voltage proportional to the rotation frequency of the roller and, consequently, to the driving speed of the car, which enters the induction brake control circuit 9, the speed meter 10 and on the measuring device 11, for example, the M ЗЗЗК, equipped with contact sleeves 12-14, connected to the control unit 15, with a mosh, which is carried out

start and stop of the counter 16 pulses, performed, for example, on the basis of the stopwatch SES-2P. The speed control limits are set with the help of the indicators of the beginning and end of the measurement of the device 11 to the specified values: V start acceleration V end of the overrun and V end acceleration of the V start of the overrun.

The counter control unit 15 consists of an AND-NE 17 logic element, for example, a 133 series, and a transistor 18 operating in a key mode. In order for the pulse counter to count down the time by counting pulses from the internal generator 19, its control terminals 20 and 21 must be opened by an internal switch, the transistor 18 is closed. In the initial state, the input of the logical element 17 receives a logical zero signal from the contact group 12 and 13 of the device 11. At the output of the element 17 there will be a signal 1, a transistor

Q

five

0

five

18 is open, pins 20 and 21 of the meter. 16 pulses are closed, time counting does not occur.

When the car accelerates, the tachogenerator 8 generates a voltage proportional to its speed, the pointer device 11- deflects and when combined with the left pointer, with which the initial acceleration speed is set, contact group 12, 13 opens, the input of the element 17 receives a signal 1, the transistor 18 is closed by opening the output terminal 20, 21 of the pulse counter 16, which starts the countdown.

When combining the arrow of the picker 11 with the right pointer, on which the final acceleration time is set, contact group 12, 14 of the device 11 closes, the signal O arrives at the input of the element 17, transistor 18 opens and stops counting time. The pulse counter records the acceleration time of the car from the speed V of acceleration beginning to the speed V of the end of acceleration.

When measuring the run-on time, the circuit operates in the same way, only the contact group 12, 14 is triggered first and starts the counter 16 pulses, and the contact group 12, 13 stops the counter.

On the pulse counter 16, the run-out time from the V end of the acceleration to the V start of the drive is recorded. In order to measure the acceleration path and the after-run of the car, the switch 22 must switch the internal counter of the counter of 16 pulses from the output of the internal generator 19 to the output of the sensor of pulses 24, for example, KVD25 connected to the roller. .

For each rotation of the roller, the sensor 24 pulses impulses one pulse, and since the circumference of the roller is 1 m, the counter 16 pulses counts the pulses of the sensor 24 and indicates the acceleration and overrun paths in meters.

The scheme of starting and stopping the counter 16 pulses while working as well as when measuring time. Button 25 is used to reset the pulse counter (zeroing).

Claims (1)

Claims for measuring vehicle performance indicators of a car comprising a platform with running rollers equipped with an induction brake connected to the output of an inductor brake control unit and an input of the measuring unit of traction characteristics, tachogenerator mounted on the axis of one of the running rollers and connected to the input of the speed meter and the input of the induction brake control unit, characterized in that, in order to extend the functionality by measuring the acceleration and run-down time of the car, the tachogenerator is also connected to the input of the measuring device, with contact groups connected to the inputs of the trigger generator, the output of which is connected to the start input of the pulse counter, equipped with a reset switch and an external and internal pulse counting switch, the input The counting of external pulses of the pulse counter is connected via a switch to the output of a pulse sensor locked at the axis of another roller.