SU1158935A1 - Device for measuring tractor slippage - Google Patents

Abstract

A DEVICE FOR MEASURING THE TRACTOR TOWING, containing the engine speed sensor, the sensor of the track-measuring wheel pulses, connected via signal converters to the recorder and control circuit, in order to increase the accuracy of measuring the average values of the slipping, a scheme is introduced into it multiply the frequency to the input of which the engine speed sensor is connected, the reversible engine speed counter, the counting input of which is connected to the output of the frequency multiplying circuit, and the control input to one of the outputs The control circuit detectors, and the reversible counter of the 1 pulses of the measuring wheel, to the counting input of which the sensor of the pulses of the measuring wheel are connected, to the first control input (L d - the second output of the control circuit, to the second control input - the output of the engine revolution counter, and the output of the reversible counter pulses of the measuring wheel are connected to the input of the control circuit. SP oo with 00 SP

Description

This invention relates to the field of measurement in comparative vehicle tests.

A known device for measuring tractor slippage, comprising speed sensors of the driving and known wheels associated with revolution counters operating in antiphase and associated with the recorder l.

A disadvantage of this device is that it does not allow measurement with sufficient accuracy, since the driven wheel of the tractor is deformed and can itself slip relative to the ground, once in a rut. ;

It is also known a device for measuring the slipping of a tractor, comprising a driver for engine revolutions, a sensor sensor for a track-measuring wheel, connected via signal transducers to the recorder and the G23 control circuit.

However, such a device also does not achieve sufficient measurement of the parameters of the skidding, the measurement and recording of the skidding are performed only at idle speed of the tractor without taking into account its working load.

The purpose of the invention is to improve the accuracy of measuring the mean values of the slip.

The goal is achieved in that the device for measuring tractor slipping, containing an engine speed sensor, a track wheel pulse sensor, connected via signal converters to the recorder and control circuit, introduces a frequency multiplication circuit, to the input of which the engine speed sensor is connected, a reversible counter motor speed, the counting input of which is connected to the output of the frequency multiplying circuit, and the control input to one of the control circuit outputs, and the reversible pulse counter The test wheel, to the counting input of which is connected the pulse sensor of the measuring wheel, to the first control input is the second output of the control circuit, to the second control input to the output of the engine rev counter, and the output of the reversible pulse counter of the measuring wheel is connected to the input of the control circuit.

The drawing shows a block diagram of a device for measuring tractor slipping.

A device for measuring tractor slippage includes an engine speed sensor 1, a frequency multiplication circuit 2, a reversing counter 3 pulses of engine revolutions, a sensor 4 pulses for the measuring wheel, a reversible counter for pulses 5 for the measuring wheel, a control circuit 6.

The sensor 1 of the engine speed is connected to the counting input of the reversible counter 3 via the frequency multiplication circuit 2, and the sensor 4 of the track-measuring impulses - directly. The control circuit 6 is connected to the control inputs of counters 3 and 5. The counter 3 is connected to the second control input of counter 5, and the output of the counter is connected to the control circuit 6.

Slipping measurement is performed in two modes of tractor operation: | Under load and at idle. When the tractor is moving under load at the test section (recommended length is 100 m), information from the engine speed sensor 1 through the frequency multiplication circuit 2 is fed to) the reverse counter 3 pulses the engine speed, which operates in accumulation mode. Simultaneously with the start of counting pulses by the counter 3, the control circuit 6 allows the reversing counter 5 pulses of the track measuring wheel to be counted against the pulses from sensor 4 of the impulses of the track measuring wheel. When the reversing counter 3 pulses the engine speed of 10,000 from it, the counter prohibits the reversing counter 5 pulses of the measuring wheel, which, through the control circuit 6, prohibits the counts from being counted by counter 3. The counter 5 records an arbitrary number of pulses of the path traveled by the tractor under load (with the presence of skidding) for 10,000 impulses of engine revolutions ..

When the tractor is idling, the control circuit 6 switches on counters 3 and 5 of the mode of subtracting the number of pulses from the engine 1 and the measuring wheel from sensor 4. As soon as 31

5, the difference is equal to zero j between an arbitrary number of pulses of the tractor's path recorded in the tractor's operating mode under load and the number of pulses of the path recorded in the idling mode (the length of the test sections for determining the tractor exhaust is equal), then the reversible counter 5 through the control circuit 6, the prohibit signal for counter 3 to deduct the engine speed pulses when the tractor is idling from among 10,000 engine speed pulses fixed in the tractor's operating mode narrow. In this way, the difference number in counter 3 corresponds to the tractor slipping numerically, and when this number is picked up by the operator, it is necessary to separate the two significant digits to the right, which reflects the tractor skidding directly in the percents without using computation.

The operation of the device is as follows:

tr 2H :: Ss.t., 79%, n „

where n "10000 - the number of pulses in engine rpm, fixed in mode

158935

. tractor operation under load on an arbitrary number of pulses of the track;

 - number of impulses of engine revolutions, fixed in the tractor operation mode at idle speed for the same arbitrary number of impulses of the track;

, 79 - differential number of pulses, proportional to the slip, fixed by a reversible counter of engine revolutions in the tractor operation mode at idle. Frequency multiplication scheme 2 is intended to provide accumulation of information about engine revolutions in the amount of 10,000 units when the tractor passes under a load of the recommended length of the test section of 100 m at various operating speeds.

The proposed device makes it possible to directly measure the average slippage value that is created from the pull load on the crocket tractor.

Claims (1)

DEVICE FOR MEASURING TOWING A TRACTOR, containing an engine speed sensor, an im- \ measuring wheel sensor is connected to the input of the control circuit. · Pulses of the measuring wheel connected via sig-input converters to one of the outputs of the control circuit, and a reversible pulse counter of the measuring wheel, to the counting input of which the pulse sensor of the measuring wheel is connected, to the first control input - the second output of the control circuit, to the second control input - the output of the engine speed counter, and the output of the reversible pulse counter trackJ 1158935 1158935 2