SU1509556A1 - Hydromechanical governor for ic-engine - Google Patents

Abstract

The invention allows to expand the range of adjustment of the controller parameters when it is coordinated with engines having different characteristics. The controller contains a centrifugal speed meter associated with the actuator control actuator spool 1 and the isodromic feedback servo motor hydraulically coupled to it. The latter is kinematically connected with the movable sleeve 4 of the spool. The presence of a device for changing the kinematic coupling ratio of the servomotor to the isodromic feedback with the sleeve 4 of the spool allows changing the parameters of the isodromic feedback and thereby expanding the adjustment range of the regulator. 1 hp f-ly. 1 il.

Description

The invention relates to engine construction, in particular, to systems for automatically controlling the rotational speed of diesel engines.

The purpose of the invention is to expand the range of adjustment of the controller by adjusting the parameters of the isodromic feedback link.

The drawing shows a functional diagram of the hydromechanical regulator.

The controller contains the spool 1 of the centrifugal rotational frequency meter, the piston 2 of the executive servo motor, the piston 3 of the isodromic feedback servo motor, the sleeve 4 of the spool., The lever 3 of the first kind with the support 6, the device 7, the change of the support sex. The weights of the speed meter are driven from the motor shaft. At steady state, the spool 1 is in the middle position and rotates around its axis. The upper disk of the spool closes the hole, leading to the cavity under the piston 3. The lower disk closes the hole in the sleeve 4, leading to the cavity above the piston 2. In the cavity above the piston

3, the working fluid (oil) from the engine oil system or from the regulator's own oil pump enters the cavity between the disks of zolot 1. Cavities under pistons 2 and 3 are in communication. The ratio of pressures in the cavity above the piston and under the piston 3 is constant and is provided by the ratio of the working areas of the differential piston 3. The ratio of the working areas of the differential piston 2 ensures a constant ratio of pressures

in the cavity above and below this piston. At steady state, piston 3 is stationary and in the middle position, spool 1 and sleeve

4 - in the middle position, piston 2, connected to the fuel delivery body, in the position corresponding to the current steady state.

The controller works as follows.

When the engine shaft speed decreases as a result of, for example, an increase in the braking torque, the rotational speed meter turns down the spool 1. The bottom disk of the rotary drive opens a window in hub 4 and. directs fluid from the cavity between the spool discs into the cavity above the pist0

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it 2. The piston 2 moves down and increases the fuel supply to the fuel. engine pumps. The fluid from the cavity under the piston 2 flows into the cavity under the piston 3 of the servomotor feedback and moves it up. The movement of the piston 3 through the lever 5 is transmitted to the sleeve 4. The holes in the sleeve 4, shifted down, are closed by the disk of the spool 1, the movement of the piston 2 to increase the fuel supply (and engine torque) stops. The upper disc of spool 1 releases some of the fluid from the cavity under the piston 3. The piston 3 and the sleeve 4 retract to the middle position. At the same time, under the action of increased torque, the engine speed increases from the set one. The piston 2 stops at a position corresponding to the new equilibrium torque and braking torque. I; -.

This aperiodic transient process is provided by the correct choice of the gear ratio from the piston 3 to the sleeve 4, i.e. the position of the support 6 on the lever 5. If you increase the moment of inertia of the rotating masses of the engine or transmission, the decrease in the engine speed will slow down. The piston 2 is lowered more than is required to restore the speed of the engine shaft. Excessive torque will increase speed. shaft to a value greater than the specified. The transition process will worsen. it will be oscillatory. To maintain a given aperiodic process, with increasing moment of inertia, it is necessary to reduce the gear ratio from the piston 3 to the sleeve 4, i.e. move support 6 to the right. The reduction in the gear ratio should be equal to the square root of the high. the moment of ineri 1i. .

If the characteristics of the engine and the load change during operation (for example, switching on the load by means of a coupling, turning off part of the fuel pumps, etc.), then simultaneously with changing the mode, support 6 must be moved. If the regulator is installed on the diesel generator , the moment of inertia of which does not change, then the support 6 is fixed in the position corresponding to the characteristics of this diesel generator. The same controller can provide the specified

quality of regulation of engines with different characteristics.

Introduction to the design of a device regulator that changes the gear ratio from the isodromic feedback piston to the spool hub allows the controller to expand the tuning range of the controller parameters and thereby ensure the required quality parameters of the transients of the engines.

Claims (2)

Invention Formula one . A hydromechanical frequency controller for the internal combustion engine, containing a centrifugal rotational speed meter, an actuating servo motor connected to the fuel delivery body, an isodromic feedback servo motor and a switchgear with a slide valve and a movable sleeve, installed in the pressure source hydraulic communication line with the isomer servo motor and a sliding valve and a movable sleeve installed in the hydraulic link of the pressure source with the idle speed servo motor and the idle valve. communication and the executive servomotor, with the movable bushing of the switchgear kinematically connected to the serv an isodromic feedback motor, and a spool with a centrifugal a rotational speed meter, characterized in that, in order to extend the tuning range. by adjusting the parameters of the isodromic feedback, the kinematic relationship the isodrom feedback servo motor is provided with a device for changing the gear ratio, 2. The regulator according to claim 1, about tl and - h-and y with the fact that the device to change the gear ratio of the kinematic link, made in the form of a lever of the first row, contains a screw pair for changing the position of the support lever of the first row.