SU1615587A1 - Device for signalling engine loading - Google Patents

Abstract

The invention relates to devices for controlling the loading degree of the internal combustion engines of machine-tractor units. The purpose of the invention is to increase the convenience of operation. The detector contains an electric contact sensor 1, a reference frequency generator 3, a driver 4, a counter 5, dividers 6,7,8, triggers 9,10, two key elements made in the form of two-input logic circuits 11,12, a two-input logic circuit 13 and an indicator 14 with their new telecommunications. 3 il.

Description

The invention relates to a measuring and control technology, in particular, to devices for monitoring the loading degree of internal combustion engines of machine-tractor units under operating conditions.

The purpose of the invention is to increase the convenience of operation.

FIG. 1 shows a block diagram of the detector; in fig. 2 - shaper circuit; in fig. 3 - time diagrams of shaper operation.

The engine load indicator contains an electrical contact sensor 1 of the fuel supply limiter 1, connected to the input of the conversion circuit 2. This circuit consists of a generator 3 of the reference frequency, a driver 4, counter 5, dividers 6-8, two triggers 9 and 10, two key elements , made in the form of two-input logic circuits 11 and 12, two-input logic circuit 13, indicator 14, each output of the driver 4 is connected to the installation input of the first 6 and third 8 divider, the second information input of the dividers 6-8 is connected to their output s, and the first input of the indicator 14 is connected to the second input of the third two-input gate 12, its third input coupled to the second input of the first two-input gate 11 and second input 14 of the indicator to the mounting lodklyuchen input of the second divider 7.

Shaper 4 start pulse (Fig. 2) is a device that prepares a circuit for converting the chain 2 to work. It carries out the formation of the trigger pulse of the counter 5.

The shaper works as follows.

The signal from the contact sensor (Fig. 3, position a) is fed to the input of the filter. After filtering the input signal (Fig. 3, position b), the latter is fed to the input of the circuit with an RS flip-flop (Fig. 2), where start-up pulses are formed (Fig. 3, position c).

Each additional output of the imaging unit 4 is connected to the setup input of the first 6 and third 8 dividers, which allows zeroing dividers 6 and 8 by setting signals produced by the imaging unit 4 from the input signal of sensor 1. The second information input of each divider 6-8 is connected to its outputs and provides self-locking dividers 6-8 on their output signals.

The first input of the indicator 14 is connected to the second input of the third key element, made in the form of a two-input logic circuit 12 (for example, element 2I- NOT), the third input of the indicator 14 is connected to the second input of the first element, made in the form of a two-input logic circuit 11, which allows eliminate the operation of the indicator 14 in case of abrupt changes in the limiting values of the engine load modes.

0 Counter 5 is a device in which three signals of predetermined (reference) duration are formed: Ti, t2 and TK. Signals of duration ti and t2 are compared in dividers 6 and 8 with the input signals of sensor 1. In the case when the length of the input signal from the sensor is longer than the specified (reference) duration, the output of counter 5 extracts the signal to the main information input

0 divider 6 (8).

A signal of duration t3 enters divider 7 without comparison with the input signal and serves to reset RS flip-flops on the signal from divider 7.

5Alarm works as follows.

Depending on the ratio of the pulse frequency from the generator 3 of the reference frequency and the pulses from the shaping device 4, the first, second and third output of the counter 5 appear on the signal, defining the underload, normal, and overload modes, respectively.

For example, in the Underload mode, the signals appear on the first output of counter 5 (the output is a conversion factor proportional to the engine in the Underload mode) and is fed through divider 6 to the setup input of trigger 9, output

0 whose signal through the main input of the two-input logic circuit 11 generates a control signal for the indicator 14 at its first input, which corresponds to the Underload mode.

5When the engine is operating in the Overload mode, signals appear on the third output of counter 5 (output with a conversion factor proportional to the Overload mode) and go through trigger 10 and

0 two-input logic circuit 12 to the third input of the indicator 14. Dividers 6-8 at the installation input. Are transferred to the initial state when the engine loading mode changes and self-locks by

5 to the second information input by a signal from its output in the absence of a change in the engine loading mode.

When the engine is operating in the optimal mode, signals appear on the second output of counter 5, which through the second divider 7 set the triggers 9 and 10 to the zero state and simultaneously these signals lead to self-blocking of the divider 7 via its second information input. From the outputs of the flip-flops 9 and 10, the signal O acts on the main inputs of two-input logic circuits 11 and 12, on the other inputs of which there is a signal 1 from the first and third inputs of the indicator. The presence of signal 1 at both inputs of the two-input logic circuit 13 leads to the formation at its output of a signal O, which ensures that the indicator 14 is triggered by its second input.

When the engine is in underload or overload mode, the output signals O from the output of the first, 6 or third 8 splitters cause the first 9 or second 10 trigger to switch and a signal 1 appears at their outputs, which acts on the first inputs of the two-input logic circuits 11 and 12, on the second inputs of which signal 1 was present in the Norma mode.

The action of signals 1 on both inputs of one of the two-input logic circuits 11 or 12 results in the appearance at their output of a signal O, which ensures that the indicator 14 triggers on its first or third input, i.e. An appropriate indication of Underload or Overload appears.

The proposed detector allows the conditions to be improved by the mechanic when performing technological operations and, thus, increasing its operational characteristics.

Claims (1)

The invention The engine load indicator, which contains an electric contact sensor of the fuel limiter, a reference frequency generator, driver, counters, three dividers, two triggers and an indicator, the counter input of which is connected to the output of the reference frequency generator, a reset input through the driver connected to the output of the electrocontact sensor of the fuel supply limiter, the first output through the first divider is connected to the installation input of the first trigger, the second output through the second divider is connected to the reset inputs of the first and second triggers, and the third output through the third divider is connected to the installation input of the second trigger, characterized in that, in order to increase the convenience of operation, three 2I-NOT elements are introduced into it, wherein the second and third outputs of the former are connected respectively to the installation inputs the first and third dividers, the additional inputs of the dividers are connected respectively to their own outputs, the outputs of the first and second triggers are connected respectively to the first inputs of the first and second elements 2I-NO, the output of the first element 2I-NOT connected to the first input of the indicator, to the second input of the second element 2I-NOT and to the first input of the third element 2I-NO, the output of the second element 2I-NOT connected to the second input of the indicator and to the second inputs of the first and third elements 2I-NOT, and the output of the third element 2И-NOT is connected to the third input of the indicator and the installation input of the second divider. IN 3 4w 4w one f4 ge "SJ l§ §p § WITH $ P5; I