SU123410A1 - Hydraulic speed control for internal combustion engines - Google Patents

Description

Existing hydraulic speed controllers are usually based on the fact that when the engine speed changes, the amount and, accordingly, the pressure of the fluid supplied by the low pressure pump, driven by the engine shaft, changes into the cavity of the servo motor that controls the high pressure pump throttle. loaded with a spring. The high-speed mode of the engine is established by tensioning this spring or by changing the cross section of the throttling orifice, which bypasses the fluid from the servomotor cavity.

In the described hydraulic speed controller, as opposed to the existing ones, in order to reduce the degree of unevenness of the control system, a suction gear pump connected to the engine shaft and connected to a common drive with a booster fuel pump is connected to the suction cavity of the pump to prevent engine spacing in case of failure of the drive of the suction pump. Such a design of the hydraulic speed regulator allows a more complete use of the fuel system with throttling to the exhaust, since by varying the capacity of the suction pump it is possible to change the degree of unevenness of the regulator in broad predictions.

The described controller can be widely used on internal combustion engines that do not require precise maintenance of revolutions and precision regulation.

The drawing shows a diagram of the described hydraulic speed controller in two versions.

Liquid fuel is pumped / supplied from the tank to the throttle 2, in front of which the reducing valve 3 is installed, which maintains a constant pressure in front of the throttle 2. Part of the fuel that went through

No. 123410-2 -

throttle 2 passes through throttle 4 to high pressure pump 5 and from there the engine cylinder B is supplied. The remaining part is pumped out by pump 6 to the drain.

Pumps 1 and 6 are driven by a motor shaft and are connected by a common drive.

When the engine load drops, its engine speed increases, the amount of fuel pumped out by the pump 6 increases, the pressure in front of the throttle 4 drops, and the fuel filling of the pump decreases accordingly.

5 and the flow of fuel into the engine cylinder, which causes the engine to slow down. As the engine load increases, the engine speed drops, the amount of fuel pumped out by pump 6 decreases, the pressure before dross 1 4 rises, the filling of pump 5 increases, the fuel supply to the engine cylinder increases and the engine speed increases.

The described scheme of the hydraulic speed controller can be performed in this way (option II), which is pumped out by the pump

6 does not go to the drain (as in the first embodiment), but returns back to the pressure reducing valve 3 and through the throttle 2 together with the fuel coming from the pump /, passes again partially through the throttle 4 into the high pressure pump 5 and the engine cylinder, and in part pumped out by a pump (5, etc.

The hydraulic revolutions regulators described are simple in design and show high dynamic qualities of the regulation, due to the fact that the change in fuel supply is dependent on the change in engine speed, it is almost dry overnight.

Subject invention

Claims (2)

1. The hydraulic speed controller for internal combustion engines has their high-pressure fuel pump with a throttling suction inlet, characterized in that, in order to reduce the degree of unevenness of the control system, the suction cavity of the high-pressure fuel pump in front of the throttling orifice of this pump pumping gear pump connected to the engine shaft. 2. The hydraulic speed regulator according to claim 1, characterized in that, in order to prevent the engine from scattering in the event of a failure of the drive of the evacuation pump, the latter is connected by a common drive to the priming pump. }, P dariant