SU1239541A1 - Device for measuring angle of advance of fuel supply in diesel engine - Google Patents

Description

The invention relates to mechanical engineering, in particular to the diagnosis of internal combustion engines, namely, to means of measuring the fuel advance angle to a diesel engine. ,

 The purpose of the invention is to simplify and extend the functionality of the device by measuring the angle on the engines of tact.

The drawing shows a block diagram of a device for measuring the fuel advance angle to a diesel engine.

The device contains an upper dead center sensor 1 (TDC) and a sensor 2 is moved and the nozzle needles, of which through the formers 3 and 4 rectangular pulses are respectively connected to the corresponding input of the first trigger 5, which through the first input of the coincidence circuit 6 is connected to the input the first register 7; the second input of the .6 matching circuit input is connected to the output of the voltage generator 8, equalized by voltage. rectangular pulses, a display unit 9 whose input is connected to the output of the first register 7, a power source, a second register 10 with an inverse output, which is connected to the control input of the generator 8, a second trigger 11 with a counting input, connected to the output of the generator 8, switch 12c one moving contact connected to the input of the second register 10, and two fixed contacts, one of which is connected to the output of the trigger 11, and the second to the output of the generator 8, and a reset button 13 connected between the setting inputs of the registers 7 and 10 and zero bus power source. .

The device works as follows.

When button 13 is pressed, both registers 10 and 7 are reset, as a result, zero is displayed on display unit 9, and a single signal is received from the inverted output of one of the bits of register 10 to the control panel of the controlled generator of 8 rectangular pulses. register 10 continuously receive high-frequency pulses of the generator 8, and at the input of the first .register 7 these pulses are received only during the presence of

the output of the trigger 5 of a single signal, which is proportional to the fuel injection advance angle, since the trigger 5 is controlled to form

in amplitude and duration by the formers 3 and 4 signals from the needle displacement sensor 2 and the piston arrival sensor 1 in this one. cylinder in TDC. As soon as the known number Nj is recorded in the second register 10 in advance, a zero signal appears at its inverse output, as a result of which the generator 8 stops the generation of pulses and to the inputs

register w pulses do not arrive. From the moment you press button 13 to the moment of generation, the first register 7 records a certain number Nv, the value of which in the decimal system

The numbers are displayed on the display unit of the display 9. During the time interval tj, during which the indicated numbers were recorded, the shaft made m turns m C / T, where

T - the period of rotation of the shaft.

Moreover, the indicated numbers can be represented by the expressions

N m

t f × 3

Nj - T-m-fj,

where f.

- the frequency of the pulses of the generator 8, and the ratio of the numbers - with the image that is, om:

N, N,

tJt uJT

 J

2TG

where G is the angle of operation of the injection.

fuel.

From the last expression we obtain the formula for calculating the injection advance angle (in radians)

45

at

or degrees

at

55

Given N 36010 and choosing any k, the injection advance angle gets from the indications of the display unit 9 by moving the comma to the left of the comma.

To double the lead angle measurement cycle again

Press button 13 and the device will start working in the same way as described above. {

Thus, when installing switch 12 to the first position I, the proposed device allows. measure the advance angle of a two-stroke diesel fuel supply.

To measure the fuel injection advance angle of a four-stroke diesel switch 12 is necessary

will install | II, Since the four-stroke engine has an injection, the top-head into the cylinder occurs once during two shaft turns, and the frequency of the pulses entering the second, register from the output of the second trigger, is two 13 times lower, the measurement result obtained on the indicator will be match the fuel advance angle for the four-stroke engine.

Editor N. Dumbass

Compiled by P. Filippov

Tekred I.Popovich Proofreader T. Kolb

Order 3387/41 Circulation 778 Subscription VNIIPI State Committee: USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

production and printing company, Uzhgorod, st. Project, 4

Claims (2)

1. DEVICE FOR MEASURING ANGLE OF ADVANCE OF FUEL SUPPLY TO DIESEL, comprising a top dead center sensor and a needle displacement sensor. nozzles, each of which is connected through a square-wave generator to the corresponding inputs of the first trigger, the output of which through the first input of the matching circuit is connected to the input of the first register, the second input of the matching circuit is connected to the output of the square-wave generator, the display unit, the second register with inverse output and a power source, characterized in that, in order to simplify and expand the functionality, the device further comprises a second trigger with a counting input, switch l with two fixed and one movable contact and a reset button wherein · rectangular pulse generator is voltage controlled and its control input connected to the inverted output "! the second register, and the output is additionally connected to the counting input of the second trigger and the first fixed contact of the switch, while the second fixed contact of the switch is connected to the output of the second trigger, the moving contact is to the input of the second register, and the reset button ^ 'is connected between the setting inputs of the registers and zero power supply bus. 2. The device according to claim 1, wherein the outputs of the first register are connected to the inputs of the display unit. , SU „, .1239541 I output of the trigger 5 of a single signal, which is proportional to the lead angle of the fuel injection, since trigger 5 is controlled by the shapers 3 and 4 generated by the amplitude and duration, the signals coming from the needle movement sensor 2 and the piston arrival sensor 1 in this one. cylinder in TDC. As soon as the previously known number N _{2 is} written in the second register 10, a zero signal appears on its inverse output, as a result of which the generator 8 stops the generation of pulses and no pulses arrive at the inputs of the registers. From the moment the button 13 is pressed until the moment the generation is stopped / in the first register 7. some number Νγ is written, the value of which in the decimal system * 20 is displayed on the display ~ of the display unit 9. During the time interval t _e during which the indicated numbers were recorded, the shaft made m revolutions m = t ₃ / T, where T is the period of rotation of the shaft. Moreover, these numbers can be represented by the expressions 1'5 ¹ . . 1239541