RU2349781C1 - Electronic controller of rotational frequency for control of fuel supply by high pressure fuel pump - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: electronic controller of rotational frequency for control of fuel supply by high pressure fuel pump comprises control unit, actuating mechanism with magnetic conductor coil and anchor with permanent magnet. Magnetic conductor connected to source of control voltage creates alternating magnetic field, inside of which permanent magnet is located.

EFFECT: higher reliability and durability of electronic controller.

1 dwg

Description

The invention relates to the field of engine engineering, in particular to the design of electronic regulators of high pressure fuel pumps (TNVD) of diesel engines.

The regulator is one of the main components of the diesel high pressure fuel pump. It maintains the constancy of the diesel mode, set from the control panel, limits the maximum and minimum engine speed.

The design of the Bosch electronic controller (Gorbachenko V.K. et al. Electronic fuel supply control systems in diesel engines is known. - M .: TsNII-TEIavtoprom, 1989, p.15-21), containing an electronic fuel supply control unit, an electronic load adjuster , an actuator with a cone-shaped seat and an electromagnet shaft, a capacitive rail position sensor that extends the functions of the regulator, namely, it allows you to adjust the fuel supply depending on temperature, pressure at the air inlet to the cylinder, and the temperature is cooling liquid smoke of the exhaust gas, etc.

A disadvantage of the known design of the electronic controller is the use of a rather complex, and therefore less reliable and expensive load adjuster. At the heart of his device is a potentiometric pedal position sensor that sets the mode of operation. The setter is placed in a protective casing, in one of the cavities of which there are two duplicated return springs and a friction disk, which provides normalization of the moments of forward and reverse strokes with the necessary hysteresis for reliable determination of the pedal stroke. To implement the boost mode (“kick-down”), a set-up device is provided in the controller that creates increased resistance to rotation shortly before the end of the driver’s pedal stroke. Such a surge in the moment of resistance is necessary for a clear fixation of the inclusion of forced modes. The device is regulated by means of spring-loaded balls, turning when turning to a surface of a smaller radius. A potentiometer is located in another cavity of the setter. To achieve high reliability and durability, the conductive path of the potentiometer and movable contact are carefully made of high-quality materials.

Closest to the claimed one is the design of the electronic controller (RF patent No. 2290523 "Electronic speed controller for controlling the fuel supply by the high-pressure fuel pump", IPC ⁶ F02D 1/08, published on December 27, 2006, authors V.M. Bunov, BC Murzin, B.A. Murdasov, V.V.Sheshukov, G.N. Terentyev, E.V. Bunova, A.E. Safonov), selected as a prototype, containing a control unit, an electromagnetic actuator, a rail position sensor, made for integral with the rail, a position sensor located inside the actuator And winding position sensor placed on an inner surface of the magnetic circuit. In the actuator of the present invention, the magnetic circuit coil is connected to a constant voltage source and creates a constant magnetic field, in the gap of which is the winding of the armature coil, to which a control current is supplied.

A disadvantage of the known design is the presence of cyclic bending loading on the lead wires of the moving coil of the armature of the actuator, which affects the reliability of the controller.

The invention solves the problem of improving reliability and increasing the life of the electronic controller.

This problem is solved in that in an electronic speed controller for controlling the fuel supply by a high-pressure fuel pump containing an electronic control unit, an actuator, a rail position sensor integrally with the rail, according to the invention, the actuator comprises a magnetic circuit coil connected to a source control voltage, and permanent magnet armature.

A significant difference of the proposed electronic controller is to increase reliability and increase the service life.

The task is achieved by the fact that when you connect the magnetic circuit coil to the control voltage source, an alternating magnetic field is created, inside of which there is an armature with a permanent magnet. As a result, a force action arises between the coil connected to the control voltage and the permanent magnet, which is used to move the rail of the fuel pump.

As a result, in comparison with the prototype, there is no cyclic bending loading on the lead wires of the movable armature coil, which increases the resource and facilitates the maintenance of the electronic controller.

The scheme implements the main feedback on the diesel engine speed and additional feedback on the diesel engine speed and current of the magnetic circuit of the actuator. Feedback on the frequency of rotation of the crankshaft of the diesel engine is used to maintain a given speed. When a signal for setting the crankshaft speed (the signal is set in the form of a voltage) is supplied, the controller compares the reference signal and the feedback signal from the speed sensor and generates a control signal (error signal). The amplified error signal, the feedback signal on the frequency of rotation of the crankshaft, calculated by direct differentiation of the signal on the speed of rotation of the crankshaft, as well as the feedback signal on the current are summed, after which it is fed to the input of a power switch operating in a pulsed mode, to the output of which stator (magnetic coil) of the actuator. The actuator changes the amount of fuel supply, increasing or decreasing the speed of the crankshaft.

The invention is illustrated in the drawing, which shows a General view of the electronic controller.

The electronic regulator contains a control unit (not shown in the drawing) connected to all the regulator nodes via a wired network, an actuator 1, in which the armature 2 with a permanent magnet 3 is integral with the rail 4 of the high-pressure fuel pump 5. The regulator also contains a magnetic circuit 6, rigidly mounted on the housing of the fuel pump 5, the coil of the magnetic circuit 7.

Spurious interference induced by the anchor winding of an electromagnet on the measuring winding of the fuel rail position sensor is taken into account by special filters of the control unit and neutralized.

The electronic controller is a closed circuit for automatic control of the diesel engine speed.

The principle of operation of the actuator of the electronic controller is based on the influence of magnetic fields of the constant magnetic field of the armature and the proportional-integral-differential control of the magnetic field of the magnetic circuit coil connected to the control voltage source, which varies according to the law.

The coil 1 of the magnetic circuit 2, connected to a control voltage source, creates a changing magnetic field inside which there is a permanent magnet 3 located on the armature 4, which is rigidly connected to the rail 4 of the fuel pump 5. Depending on the size and direction of the control current of the coil 1, the armature 4 with a permanent magnet 3, made in one piece with the rail 4 of the fuel pump 5, will move, changing the fuel supply.

The proposed modification of the electronic regulator is applicable for all types of diesel engines, does not require a change in the design of the fuel pump, and its cost remains at the same level as its counterparts, with its advantages achieved, which contributes to its introduction into production.

Claims (1)

An electronic speed controller for controlling the flow of fuel by a high-pressure fuel pump, comprising an electronic control unit, an actuator, a rail position sensor integrally with the rail, characterized in that the actuator comprises a magnetic circuit coil connected to a control voltage source and an armature on which the permanent magnet is located.