RU2293390C1 - Energy plant with interference suppression device, having decreased introduced electric capacity - Google Patents

Abstract

FIELD: engineering of vehicle energy supplies, for automobiles in particular.

SUBSTANCE: in accordance to invention, mounted between walls of plug well and ignition coil mounted in well is screen, provided (with forming of open circular coil) with through recess, extending from end of screen positioned on the side of spark plug to the end of screen opposite relatively to spark plug. Screen is made perforated by a set of through slits, positioned in parallel to longitudinal geometrical axis of screen. Minimal width of any one of slits is selected so that its opposite edges do not contact each other during radial forming of screen, value of interval between screen slits equals from 1 to 3 of values of slit width, while maximal length of slit is less than length of screen generatrix.

EFFECT: decreased electric capacity introduced to electric contour of ignition coil, without substantially increasing radio interference emitted from radiation object and, as a result, improved energetic parameters thereof.

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Description

The invention relates to devices for energy supply of vehicles, in particular a car.

From the book of V.A. Balagurov "Ignition Devices", M. Mechanical Engineering, 1968, p. 12, the power plant of a car is known, formed by an internal combustion engine with forced ignition, which includes a cylinder head and an electric spark ignition system. The spark ignition system includes an openly mounted ignition coil containing a high voltage lead, a spark plug installed in the cylinder head, containing a central electrode and a contact rod, and a high voltage wire containing a conductive core, one end of which is galvanically connected to the high voltage lead of the ignition coil, and the other with the contact rod of the spark plug, and the insulator. In this case, the noise suppression device of the power plant is formed by a resistive element located between the central electrode and the contact rod of the spark plug, as well as made with distributed electrical parameters of the conductive core. Moreover, from the book of VB Rabzhayev, G. Babich, L. M. Korets, “Automotive Tractors and Wiring Harnesses”, M. Energoatomizdat, 1989, p. 19, high-voltage wires with a conductive core with distributed parameters of two types: with distributed active resistance (resistive wire) and with distributed active-inductive-capacitive resistance (impedance wire). One of the disadvantages of the above ignition system is the large energy loss in the noise suppression device.

From the patent US 6437674, IPC H 01 F 27/02 (publication 20.08.02), a power plant of a car is known, formed by an internal combustion engine with forced ignition, including a cylinder head containing cylindrical candle wells made in the cylinder head, and an electric spark ignition system . The spark ignition system includes a spark plug located in each of the spark plug wells containing a contact rod, and an ignition coil axially mounted on the spark plug containing a high voltage winding and a high frequency inductor integrated into the ignition coil. In this case, the noise suppression device is formed by cylindrical candle wells made in the cylinder head, as well as by high-frequency inductors integrated into the ignition coils. Moreover, one of the conclusions of the high-frequency inductor is galvanically connected with the contact rod of the spark plug, and the other with one of the conclusions of the high-voltage winding of the ignition coil. One of the disadvantages of the ignition system described in the above patent is the inefficiency of suppressing radio interference with frequencies above 100 MHz.

The prototype of the invention is known from the patent EP 0951028, IPC N 01 F 38/12 (publ. 20.10.99) power plant of the car, formed by internal combustion engines with forced ignition, containing the cylinder head with cylindrical candle wells made in the cylinder head and an electric spark ignition system including a spark plug located in each of the spark plug wells containing a contact rod and an ignition coil axially mounted on the spark plug containing a high voltage winding, as well as mehopodavitelnoe device. In this case, the noise suppression device is formed by a cylindrical candle well, within the geometrical volume of which there are both a candle and an ignition coil, as well as a screen. Moreover, the screen is made in the form of a hollow made of a solid magnetically and electrically conductive material, coaxial relative to the longitudinal geometric axis of the candle well and the ignition coil located between the walls of the candle well and the ignition coil of the cylinder, equipped (with the formation of an open ring coil) with a through cut extending from the located from the side of the spark plug to the end of the screen and to the opposite, relative to the candle, end of the screen. One of the disadvantages of the prototype is the increased electrical capacity of the magnetic screen introduced into the primary winding of the ignition coil.

Considering that due to the increase in the electric capacity introduced by the screen into the electric spark ignition system, the energy characteristics of the electric spark ignition system are deteriorating, the object of the invention was to create a power plant, in particular a car, with an electric spark ignition system having a small electric capacity introduced into the electric spark ignition system.

The problem is solved in a power plant formed by an internal combustion engine with a positive ignition, including a cylinder head (cylinder head) containing at least one cylindrical candle well made in the cylinder head, an spark ignition system containing a candle installed in the candle well ignition comprising a contact rod and axially mounted on the spark plug ignition coil with windings, as well as a noise suppression device containing a candle well inserted in the cylinder head, within the geometrical volume of which both the candle and the ignition coil are located, as well as a cylindrical screen coaxially located between the walls of the candle well and the ignition coil installed in the well, provided with (with the formation of an open annular coil) a through cut extending from located on the side of the candle end of the screen to the opposite, relative to the candle, the end of the screen.

The problem is solved in that the screen is made of a perforated set of through slots located parallel to the longitudinal geometric axis of the screen, the minimum width of any of the slots is selected from the condition of non-closure of its opposite edges when the screen is radially formed, the interval between the screen slots is from 1 to 3 values of the slot width, the maximum the length of the slit is less than the length of the screen generatrix.

The invention is illustrated by the following drawings.

Figure 1 shows a variant of noise suppression, with a reduced capacity of the device, with a lot of single through slits along the screen generatrix, stepwise distributed along the screen guide.

Figure 2 shows a variant of noise suppression, with a reduced capacity of the device, with a lot of short through slots distributed at intervals along the generatrix and along the screen guide.

The invention is implemented by an internal combustion engine (not shown) comprising a cylinder head 1, a spark plug 2, a spark plug 3 made in a cylinder head, an ignition coil 4 and a suppression device. The spark plug 2 is installed in the candle well 3 of the cylinder head 1. The ignition coil 4 is axially mounted on the spark plug 2 and is also located in the cylindrical candle well 3. The suppression device is formed by the spark plug 3, as well as made of magnetically and electrically conductive material, coaxial with respect to longitudinal geometric axis of the candle well 3 and the ignition coil 4, located between the walls of the candle well 3 and the ignition coil 4 installed in the well, with a screen 5 provided with open loop) through cut 6, extending from the end of the screen 5 located on the side of the candle 2 to the opposite, relative to the candle 2, the end of the screen 5.

Perforation can be formed by many long ones, the longitudinal size of which is up to 95% of the length of the screen generatrix, parallel to the longitudinal geometric axis of the screen, distributed at intervals along the screen guide of the through slits, or many parallel to the longitudinally geometric axis of the screen, distributed at intervals along the screen guide of the perforation lines, each of which is formed by at least two short through slots spaced at intervals, the longitudinal geometric axes of which coincide They are given and parallel to the longitudinal geometric axis of the screen, or a combination of long slots and perforation lines.

At the same time, the edges of the long slits adjacent to the end face of the screen 5 from the side of the ignition coil 4 are indented from the end of the screen, the edges of the long slots adjacent to the end of the screen 5 from the side of the spark plug 2 from the side of the ignition 2 can be indented from the end of the screen, and with an incision the ends of the screen adjacent to any of the ends of the screen, the edges of the short slots can be made both indented from the end of the screen, and with the formation of an incision of the end of the screen.

The minimum width of any of the slots is selected from the condition of non-closure of its long edges when the screen is radially formed. The size of the interval between the slots of the screen is from 1 to 3 values of the width of the slit.

Magnetic field lines of the magnetic field formed by the primary and secondary windings of the ignition coil, propagating along the path of least magnetic resistance (magnetic and electrically conductive screen), envelops the gaps without crossing them. In this case, the magnetic resistance of the magnetic circuit in the case of using a perforated slit screen does not increase significantly compared to a screen without slotted holes. The electrical component of the electromagnetic field of interference propagating through the channel formed by the walls of the screen and the walls of the candle well of the cylinder head also does not cross the perforating screen of the slit, which excludes the possibility of their work as slit antennas. At the same time, a decrease in the total area of the magnetic and electrically conductive screen leads to a decrease in the electric capacitance introduced into the electric spark ignition system.

Claims (1)

A power plant formed by an internal combustion engine with positive ignition, including a cylinder head (cylinder head), comprising at least one cylindrical spark plug well in the cylinder head, an spark ignition system comprising an spark plug installed in a spark plug well, comprising a contact rod, and an ignition coil axially mounted on the spark plug with windings, as well as an interference suppression device comprising a head a spark plug well, within the geometrical volume of which there is both a candle and an ignition coil, as well as a cylindrical screen coaxially located between the walls of the spark plug well and an ignition coil installed in the well, equipped with an open ring (with the formation of an open ring coil) extending from the side of the candle end of the screen to the opposite of the candle end of the screen, characterized in that the screen is made of perforated many parallel to the longitudinal of the geometric axis of the screen of the through slits, the minimum width of any of the slots is selected from the condition that its opposite edges do not close when the screen is radially formed, the interval between the screen slots is from 1 to 3 values of the slit width, the maximum slit length is less than the length of the screen generatrix.

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