SU705293A1 - Apparatus for measuring indicator power of piston machines - Google Patents

Description

(54). DEVICE FOR MEASURING THE INDICATOR POWER OF PISTON MACHINES

3

705293 This is ensured by the fact that in the device for measuring the indicator. power of a porsche machine containing a pressure sensor and a rotation angle sensor one-shot controlling input of the sensor is connected to the output of the pressure sensor and the triggering input is connected to the first output of the rotation sensor, the control unit connected to the first input to the second output of the angle sensor and the first output to the first the input of the registrar unit connected by the second input to the first output of the synchronization unit and the third input to the output of the dMi4i6 CKOro register and the first input of the double adder connected to the output - With the first input of the circuit s transfer, whose output is connected to a second input of the adder, a binary adder coupled to the output from the first input-compensation tion scheme, wherein the first v1hod brediyon to the input of the dynamic register, the second; ffi} 85ff- eBTdpbiMH vhlda; schemes of control unit, the second input with the second output of the synchronization unit,. the third one is connected to the third input of the transfer circuit, to the third input of the control unit and the first input of the input circuit, the second input of which is connected to the one-vibrator output, the third and fourth inputs to the second and third outputs of the control unit, respectively, the first output with the third input of the binary adder, the second output - with the third input of the correction scheme / FIG. 1 shows a block diagram of a device for measuring the indicator power of piston machines; in fig. 2 -. functional diagram of the proposed device,. A device for measuring the power of piston masks contains a pressure sensor 1, a one-shot 2, a rotation angle sensor 3, an overhanging block 4, a synchronization block 5, a control block 6, and a recording block 7. Computing unit 4 consists of a dynamic register 8, a serial binary adder 9, an input circuit 10, a transfer circuit 11 and a correction circuit 12. The output of the pressure sensor 1 is connected to the control input of the one-shot 2, which input input is connected to the first output of the rotation angle sensor 3. The second output of the rotation angle sensor 3 is connected to the first input of control unit 6 The output of dynamic register 8 connections to the first input of registration unit 7, and the first input of adder 9, the second input of which is connected to the first output of input circuit 10, and the third input to output of circuit 11 carry. The first output of the adder 9 is connected to the first input of the correction circuit 12, the second output of the adder 9 is connected to the first input of the transfer circuit 11. The second input of the transfer circuit 11 is connected to the first output of the correction circuit 12 and the second BXOUOM of the control unit 6. The first output of the synchronization unit 5 is connected to the first input of the input circuit 10, the third input of the transponder circuit 11 and the third input of the control unit 6. The third output of the control unit b is connected to the second input of the registration unit 7, the third input of which is connected to the second output of the synchronization unit 5, the third output with the second input of the correction circuit .12. The second output of the correction circuit 12 is connected to the input of the dynamic register, and the third input is connected to the second output of the input circuit 10. The second input of the input circuit 10 is connected to the output of the one-shot 2, the third and fourth inputs, respectively, with the first and second outputs of the control unit 6. The synchronization unit 5 (FIG. 2) consists of a quartz oscillator 13, a binary counter 14, a decoder of 1 5 bits and a decoder of 16 tetrads. The input circuit 10 comprises a trigger 17, three elements AND 18-20 and an element OR 21. The transfer circuit 11 includes an element AND 22, two. element OR 23.24, inverter 25 and J-Trigger 26. Correction circuit 12 contains two 1-triggers 27, 28, five And 29-33 elements and two inverters 34, 35. On the functional diagram (FIG. 2), the output of sensor 1 The pressure is connected to the control input of the one-shot 2, the triggering input of which is connected to the first output of the rotation angle sensor 3 connected by the second output to the first input of the control unit 6. The output of the one-shot 2 is connected to the first. the input element And 18 schemes 10 input, the second input of which is connected to the first in; output of the decoder 1B of the block 5 with synchronization. Four outputs of the decoder 1 5 form the first group of outputs of the synchronization unit 5. The output of the element And 18 is connected to the first input of the element And 19 and the first input of the element, OR 21, the second of which is connected.

It is connected to the forward output of the trigger 17. The forward input of the trigger 17 is connected to the output of the element H 19, the inverse input to the first input of the OR element 24 of the transfer circuit 11 and the second output of the Decoder 15 of the synchronization unit 5, the third output of which is connected to the third input of the element OR 21. The output of the OR element 21 is connected to the first input of the AND element 20, the second input of which is connected to the first output of the control unit 6 connected by the second output to the second input of the And element 19. The output of the dynamic register 8 is connected to the first input of the registration unit 7 and the first input do adder 9, the second input of which is connected to the output of the element And 20 of the input circuit 10, and the third input - with the output of the Ji-flip-flop 26 of the transfer circuit 11. Input 3i-flip-flop 26 is connected to the output of the element And 22, the first input of which is connected to the output of the element OR 23, and the second input is connected to the output of the inverter 25, the Input of the inverter 25 is connected to the output of the element OR 24, the second input of which is connected to the fourth output of the decoder 1S unit 5. synchronization and the third input of the control unit 6. The first output of the adder 9 is connected to the first inputs of the AND 30 and AND 33 elements of the circuit 12 of the corrected pin, the second output is connected to the first input of the OR element 23 of the transfer circuit 11. The output of the element And 33 is connected to the input of the inverter 35 and the first input of the element And 29, the second input of which is connected to the inverse output of the trigger 17 of the input circuit 10. The output element And 29 is connected to the input of the inverter 34, the second input element OR 23 scheme 11. transfer and the second input unit 6 controls. Input 1) -trigger 27 is connected to the output of the element And 30, the second input of which is connected to the output of the inverter 34. Input B-Trigger 28 is connected to the output of the element And 31, the first input of which is connected to the output J) -trigger 27. Output I) - trigger 28 is connected to the first input element AND 32 and the second input element AND 33, the third input of which is connected to one of the outputs of the binary counter 14 of the synchronization unit i5, the other outputs of which are connected to the inputs of the decoders 15 and 16. The binary counter 14 is connected to the output of the quartz generator 13 of block 5 synchronization. Output

the inverter 35 is connected to the second inputs of the AND 31 and AND 32 elements. The output of the AND 32 element is connected to the input of the dynamic register 8. The second input of the recording unit 7 is connected to the third output of the control unit 6, and the third input of the registration unit 7 is connected to the outputs of the tetrader descrambler 16 block 5 I synchronization.

A device for measuring the indicative power of piston machines operates as follows.

The pressure sensor 1 generates an electrical signal proportional to the current pressure in the cylinder. The rotation angle sensor 3 produces on the first output pulses corresponding to the central points of the elementary volumes into which the working volume of the cylinder is conventionally divided. Full work done by gases during the piston stroke is equal to

°: -D s, -, O),

where P; - gas pressure in the cylinder,

corresponding to the Vj element volume of the cylinder;

g-j number of elementary volumes MOBu .Nj.

Summing up the positive and negative work in the cylinder for one lth, we get the work on the ith cycle

) and average indicator pressure on the th cycle

(-N

D

(3)

 where - the working volume of the cylinder

p .. is the pressure in the cylinder in the i-th incl at the j-th split point

cylinder volume.

Indicator power is determined by the expression

. ft)

50

H

TDe C - constant engine design factor, Y - constant time interval

measurements,

Claims (2)

 - the number of revolutions of the crankshaft per unit of time. Vn-lT is the number of revolutions of the crankshaft over the interval T of the measurement time. The proposed unit for measuring the indicator power of piston machines is implemented in relation to (4) as follows. The dynamic register 8, the serial binary adder 9, the input circuit 10, the transfer circuit 11 and the correction circuit 12 form a reversible ten counter, which performs the summation of the number of pulses proportional to the positive work and subtracting the number of pulses proportional to the negative work. In addition, the computing unit 4 calculates a constant measurement time interval T, at the end of which the correction circuit 12 outputs a signal to the second input of the control unit 6 on the first output. The control unit 6, based on the end time interval T signal, generates a calculation stop signal on the first output, and a third output signal on the start of the register 7 unit, which outputs the measurement result of the indicator power from the output of the dynamic register 8 to the decimal display or digits to read. Claims. A device for measuring the indicator power of piston machines, containing a pressure sensor and a rotation angle sensor, a one-shot whose control input is connected to the output of the pressure sensor ii triggering input — to the output of the rotation angle sensor, a control unit connected by the first input to the second output of the rotation angle sensor and the first output - with the first input of the registration unit, connected by the second input with the first output of the synchronization unit and the third input. - with the output of the dynamic register and the first input of the binary adder, connected output with the first input of the transfer circuit, the output of which is connected to the second input of the adder, characterized in that, in order to improve the measurement accuracy and simplify the device design, therein the binary adder is connected to the output of the first input of the correction circuit, the first output of which is connected to the input of the dynamic register, the second output is from the ffi inputs of the transfer circuit and the control unit, the second input is with the second output of the synchronization unit, the third output of which is connected to the Third input of the transfer circuit, with the third input of the control unit and the first input of the input circuit, the second input of which is connected to the one-shot output, the third and fourth inputs to the second and third outputs of the control unit, respectively, the first output to the Third input of the binary adder, the second output to the third input of the correction circuit. tye into account during the examination 1.Avtorskoe certificate of the USSR № 277334, cl. 2 QOl C 23/08, 1968. 2. Author's certificate. USSR № 432363, cl. 2 G01 L 23/08, 1972. (prototype). Grz  h h y t .one