RU2350766C1 - Rpm electronic governor to control fuel feed by high-pressure fuel pump - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: rpm electronic governor designed to control fuel feed by high-pressure fuel pump incorporates electronic control unit, actuator, and rack position pickup made integral with the said rack. The actuator incorporates magnetic circuit coil connected to the controlled voltage source and short-circuited armature coil arranged in the magnetic circuit gap.

EFFECT: long useful life of electronic governor.

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 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 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; electromagnetic actuator; rail position sensor, made in one piece with the rail; a position sensor located inside the actuator, and the windings of the position sensor are located on the 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 increasing the reliability and durability of the electronic controller.

This problem is solved in that the electronic speed controller for controlling the fuel supply by the high pressure fuel pump according to the invention contains a control unit, an actuator, a rail position sensor integrally with the rail, an actuator with a magnetic coil and a short-circuited armature winding. A magnetic circuit coil connected to a control voltage source creates an alternating magnetic field, in the gap of which there is a short-circuited winding of the armature in which the emf is induced. As a result, there is a force action between the coils, which are used to move the rail of the fuel pump. To return to its original state and equilibrium position, a spring is used.

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 life and facilitates the maintenance of the electronic controller.

The scheme implements the main feedback on the frequency of rotation of the crankshaft of the diesel engine and additional feedback on the position of the rail of the fuel pump and on the current of the coil 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. Feedback on the position of the rail of the fuel pump is designed to provide the necessary range of movement of the rail of the fuel pump. 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 position of the fuel pump rail, the signal of the rail speed calculated by direct differentiation of the signal on the position of the rail, and also the current feedback signal are summed, after which it is fed to the input of a power switch operating in a pulsed mode, to the output of which is connected to a 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 controller contains a control unit (not shown in the drawing) connected to all controller nodes via a wired network, an actuator 1, in which the rod 2 of the armature 3 with a short-circuited coil of the coil 4 is rigidly fixed to the core 5 of the position sensor 6 of the rail 7, made in one integral with the rail 7 of the high-pressure fuel pump 8. The regulator also contains a magnetic circuit 9 rigidly fixed to the fuel pump housing 8, an external magnetic circuit coil 10, exciting 11 and measuring 12 of the sensor winding Oia 6, located on the inner surface of the magnetic circuit 9, the spring 13, and the core 5 is placed inside the magnetic circuit 9.

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 an electronic controller is based on mechanical action on a conductor with induced current, placed in an alternating magnetic field. The coil 10 of the magnetic circuit 9, connected to a control voltage source (not shown in the drawing), creates an alternating magnetic field, in the gap of which there is a short-circuited winding of the coil 4 of the armature 3. An EMF is induced in it. As a result, there is a force action between the coils, which are used to move the rail 7 of the fuel pump 8.

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 a short-circuit Anchor coil located in the gap of the magnetic circuit.