SU1437535A1 - Indirect-action speed governor - Google Patents

Abstract

The invention relates to engine control systems, mainly diesel engines. The purpose of the invention is to improve the transients of the control system. A centrifugal speed meter 1 is connected to spool 4. Servomotor 5 is connected via a spool to a pressure source and connected to a metering unit. The isodromic type feedback includes a driver piston 6, a sensing piston 7 adjustable throttles 8, 10 and a spring 9 of the isodrome. The piston 6 is connected to the servomotor 5, the piston 7 is connected to the piston 6 by means of the hydraulic channel of the isodrome. The throttle 8 is installed between the hydraulic channel of the isodrome and the oil reservoir. A spring 9 connects the piston 7 with the spool 4 and is placed in a cavity connected by a drainage channel in which the throttle 10 is installed, with an oil reservoir. The use of throttles 10 allows one to expand the range of variation of the parameters of the isodromic feedback by jointly adjusting the chokes 8 and 10 and thereby improve the quality indicators of transient processes. 1 sludge; WITH

Description

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The invention relates to mechanical engineering, in particular to pk systems for powering engines, mainly diesel engines.

The purpose of the invention is to improve the transition processes of the engine speed control system.

The drawing shows a schematic diagram of the proposed controller,

The regulator consists of a centrifugal meter 1 of rotational speed with spring 2 and weights 3, spool 4, servomotor 5 hydraulically connected with spool 4 and connected to the fuel metering body (not shown), and an isodromic type feedback from the servo motor 5 and spool 4. The isodromic feedback includes a master piston 6, which is mechanically connected to the servomotor 1lem 5, a sensing piston 7 connected to the sticking piston 6 by a hydraulic channel

jjnoM a, adjustable throttle 8, installed between the hydraulic channel a, and the oil reservoir, spring 9 and 3 of the Odrom, connecting the i- receiving piston 7 with the spool | 4 and adjustable throttle iO, installed between the spring 8 cavity 9 isodrome and oil reservoir. The regulator design also includes a 1d ton oil pump and a hydraulic accumulator (not shown

The regulator works as follows.

As the engine load increases, the crankshaft rotation frequency and, at the same time, the rotation frequency of the loads 3 of the meter 1 decrease by a certain amount. The loads 8 converge and allow the spool 4 to descend under the action of the spring 2. This opens channel 6, through which the oil from the oil pump flows through channel i into the cavity and under the piston the servomotor 5, which spins upwards, increasing the flow fuel, dosing authority. At the same time, the ncip- servo motor 5 informs the master piston 6 to move downwards, which is SS G - gives excessive pressure in the channel Oi and causes the reciprocating piston 7 to move upwards and displace the MS. via the throttle 8 into the oil reservoir. The receiving piston 7 during its movement compresses the spring 9 of the isodrome, and also creates excess Q

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jHoe cavity pressure in. Under the action of the force of the spring 9 and the overpressure of the spool 4, the spool 4 rises up by the amount and at the time, depending on the stiffness of the spring 9 and the degree of opening of the adjustable throttle 10. Raising up, the spool 4 partially closes the channel, limiting the supply of oil to cavity a, the brake thereby moving the piston of the servomotor 5 to increase the fuel supply.

As a result of the transition process, the piston of the servomotor 5 will occupy a new position corresponding to the changed load on the engine, and the rotational speed of the crankshaft of the engine will take its initial value. The nature of the transient processes with other structural factors remaining unchanged will depend on the setting of adjustable chokes 8 and 10. The use of additional throttles 10 allows an impact on the spool 4 from the receiving piston 7, somewhat similar to the effect of changing the spring stiffness of the isodrome 9. it

allows for an additional i-change in the desired direction of the magnitude of the time constant of the yodromic feedback — a factor that significantly affects-. on the nature of transients. Therefore, the use of additional throttles J O allows you to expand the range of variation of the parameters of izodrom feedback by joint adjustment of chokes 8 and 10 and thereby improve the quality indicators of transient processes of the engine speed control system.

Claims (1)

Claims of an Indirectly Used Frequency Regulator, comprising a centrifugal rotational speed meter connected to a spool, a servomotor, coupled through the spool to a pressure source and connected to the metering unit, and an isodromic type feedback including a set piston connected to the servomotor perceiving piston connected to the master piston by means of the hydraulic channel of the isodrome, adjustable throttle installed between the hydraulic channel of the internal of the isodrome and the oil reservoir aroma, and spring 31437535 / isodrome linking, in order to improve the transient, the process piston with the spool and the rooms, in an isodromic feedback entered into the cavity, the second adjustable choke and the oil channel are drained, drainage is characterized by the fact that, on the cavity of the spring of the isodrome.