RU2350767C1 - 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 the high-pressure fuel pump incorporates electronic control unit, actuator, and rack position pickup made integral with the said rack. The actuator armature movable coil comprises spring-loaded brushes in contact with fixed rods.

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 electronic regulator of Bosch (B.K. Gorbachenko, V.V. Kurmanov, M.V. Masing. Electronic control systems for fuel supply in diesel engines is known. - M .: TSNIITZIavtoprom, 1989, p. 18-20), containing electronic fuel supply control unit, electronic load adjuster, actuator with a cone-shaped seat and an electromagnet rod, a capacitive rail position sensor that expands 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, temperature Coolant tours opacity of 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 control unit 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 an electronic controller (RF Patent No. 2290523 "Electronic speed controller for controlling the fuel supply by a high-pressure fuel pump", published December 27, 2006, application No. 2005123624/06, registered in the State Register of Inventions December 27, 2005 G., authors V.M. Bunov, BCMurzin, B.A. Murdasov, V.V. Sheshukov, G.N. Terentyev, E.V. Bunova, A.E. Safonov), selected as a prototype, containing electronic control unit, actuator, rail position sensor, made with integrally with the rack, wherein the position sensor is disposed within the actuator, and the position sensor winding are arranged on the inner surface of the magnetic circuit.

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 claimed invention solves the problem of increasing the reliability and durability 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 rack position sensor integrally with the rail, according to the present invention, the movable armature coil in the actuator has spring-loaded brushes in contact with fixed rods.

As a result, in comparison with the prototype, the control voltage is applied to the fixed rods in contact with the spring-loaded brushes of the movable armature coil, as a result of which there is no cyclic bending loading on the lead wires of the movable coil, which increases the life of the movable coil and facilitates 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 winding 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 speed of the crankshaft (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 whose output through the contact rods and brushes is connected to the armature of the actuator associated with the rail of the high pressure fuel pump. The actuator changes the amount of fuel supply, increasing or decreasing the speed of the crankshaft.

The proposed technical solution is illustrated by drawings. Figure 1 shows the electronic controller. Figure 2 shows the brush assembly.

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 is rigidly fixed to the core 4 of the position sensor 5 of the rail 6, made in one piece with the fuel rail 6 high pressure pump 7. The regulator also contains a magnetic circuit 8, rigidly mounted on the housing of the fuel pump 7, exciting 9 and measuring 10 of the winding of the position sensor 5 of the rail 6 of the injection pump, located on the inner surface of the magnetic circuit 8, and the core 4 of the position sensor 5, placed inside the magnetic circuit 8, the current-carrying rods 11 connected through the connectors a and b to the control voltage source (not shown in the drawing).

Anchor 3 of the actuator 1 is an insulator 12, the contact of the movable coil 13, the spring 14 and the brush 15.

Spurious interference induced by the anchor winding of an electromagnet on the measuring winding of the high pressure fuel pump 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 a mechanical action on a conductor with a current placed in a magnetic field. The coil of the magnetic circuit 8, connected to a constant voltage source, creates a constant magnetic field, in the gap of which is the armature winding 3. The armature winding 3 through the contact rods 11 and brushes 15 is supplied with a control current from the control unit. Depending on the magnitude and direction of the control current, the armature 3, rigidly fixed to the rod 2, made in one piece with the rail 6 of the fuel pump 7, will move left and right, increasing or decreasing 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 in the actuator the movable armature coil has spring-loaded brushes in contact with the fixed rods .

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