CA2361674A1 - Ignition system for propelling charges which functions according to the induction principle - Google Patents
Ignition system for propelling charges which functions according to the induction principle Download PDFInfo
- Publication number
- CA2361674A1 CA2361674A1 CA002361674A CA2361674A CA2361674A1 CA 2361674 A1 CA2361674 A1 CA 2361674A1 CA 002361674 A CA002361674 A CA 002361674A CA 2361674 A CA2361674 A CA 2361674A CA 2361674 A1 CA2361674 A1 CA 2361674A1
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- Prior art keywords
- ignition
- ignition system
- cartridge case
- primary
- coils
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
- F41A19/58—Electric firing mechanisms
- F41A19/63—Electric firing mechanisms having means for contactless transmission of electric energy, e.g. by induction, by sparking gap
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
- F42B5/02—Cartridges, i.e. cases with charge and missile
- F42B5/08—Cartridges, i.e. cases with charge and missile modified for electric ignition
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
A disadvantage of propelling charge ignition systems which function according to the induction principle is that unwanted differential gas pressures can occur, especially in the lower temperature range. This can lead to uncontrolled increases in pressure and damage or even destroy the weapon system. Attempts to counteract this with reduced quantities of powder resulted in a significantly poorer performance of the ammunition in terms of the range and penetration power of the projectile, over the entire temperature range.
According to the invention, the propelling charge bodies (1) therefore have a cartridge case (2) whose wall (6) supports at least one primary coil (7a, 7b, 7c).
According to the invention, the propelling charge bodies (1) therefore have a cartridge case (2) whose wall (6) supports at least one primary coil (7a, 7b, 7c).
Description
IGNITION SYSTEM FOR PROPELLING CHARGES i~HICH FUNCTIONS
ACCORDING TO THE INDUCTION PRINCIPLE
The invention concerns an ignition system for propellent charges, which system functions according to the induction principle, according to the pre-characterizing clause of the first claim.
Ignition systems for propellent charges which function according to the induction principle have been known for quite a long time and are described in, for example, European Patent Specification EP 0 526 389 B1.
Known from this patent application is a device for firing ammunition which has a combustion chamber which can accommodate several propellent charges bodies comprising a propellent charges and an ignition agent for igniting the propellent charges. A fixed primary coil, which receives an ignition signal, is provided at the combustion chamber, the primary coil surrounding the combustion chamber. Disposed in each propellent charges body is a secondary coil which is connected to an ignition agent resistance which initiates the ignition agent.
These ignition systems for propellent charges and those functioning according to a comparable principle have the disadvantage that unwanted differential gas pressures can occur upon the ignition of the propellent charges, especially in the lower temperature range.
These differential gas pressures can lead to uncontrolled increases in pressure in the combustion chamber and damage or even destroy the weapon system.
Attempts have been made to prevent this unwanted effect by reducing the quantity of powder used. This, however, results in significantly poorer performance of the ammunition in respect of the range and penetration power of the projectiles.
The object of the invention is therefore to improve the known ignition system for propellent charges.
This object is achieved by means of the characterizing features of the first claim. Advantageous embodiments of the invention are claimed in the sub-claims.
According to the invention, and in contrast to the known ignition systems, the at least one primary coil is disposed not around the combustion chamber, but in or on the cartridge case wall. The primary coil can thus be matched to the. size of the propellent charges, as a result of which the required ignition energy is limited to the particular need. The cartridge case wall is also advantageously suitable as a winding former, it also being possible for the windings to be run into the interior of the case wall, where they can be protected through being covered by layers of the case wall. Printed circuits applied to the cartridge case wall can also be used as a primary coil instead of wire windings.
The winding density of the primary coil can be advantageously constant over the length of the cartridge case. Production is consequently very simple and a uniform induction with a homogeneous magnetic field is achieved.
It can be advantageous, particularly when the propellent charges has several ignition systems, if the winding density is variable over the length of the cartridge case. The density of the windings for generating the inductions can be greater at the location.of secondary coils than in the area of the intervals between the secondary coils.
The primary coil can also be divided into several individual coils arranged spatially in series with different winding densities instead of in one coil.
This is already then the case if, instead of one propellant charges body,-several propellant charges bodies, each having its own cartridge wall, are combined to form a total charge. Moreover, the primary coils can be optimally assigned to the secondary coils and, consequently, also distributed variably over the length of the cartridge case.
Depending on the type of weapon, ammunition and propellant charges, both the primary coil and the cartridge case can be inert, i.e., be preserved upon combustion of the propellant charges. Alternatively, the primary coil and the cartridge case can be consumable, i.e., even burn away upan combustion of the propellant charges. Alternatively, the primary coil and the cartridge case can contribute to the burning of the propellant charges, by being themselves combustible. Coils made from the so-called printed conductors are particularly advantageous if the primary coils and the cartridge are consumable or combustible due to the fact that, unlike conductors made from wire, they can be produced from combustible or consumable materials.
Propellant charges are generally already available as propellant charges bodies of a determinate size.
Matching to the projectile type necessitates the assembly of the propellant charges bodies in the quantity required in each case. It is then advantageous if the wall of the cartridge case is composed.of a plurality of parts. Since each of the cartridge case parts has at least one primary coil the component cases must be electrically coupled., This electrical coupling can be, for example, conductive coupling, i.e., contact points adjoin when the cartridge cases are assembled. Alternatively, the electrical coupling can be capacitive. Capacitive coupling of the conductor surfaces, separated from one another by the cartridge case wall, can be effected through large-area coatings in the region of the points at which, for example, the component cases overlap. An inductive coupling of the component cases is also conceivable, induction coils which lie opposite one another following assembly of the component cases being disposed in the region of overlapping of the respective component cases.
Depending on the intended time sequence of ignition of the propellent charges, the individual primary coils can be electrically connected in series or electrically connected in parallel, In the first case, the level of the voltage induced in the respective secondary coils is dependent on the resistance of the coils of the primary circuit. In the second case, the same voltage is present in all primary coils.
It is also possible to combine the two electrical circuits of the primary coils, by electrically connecting a portion of the primary coils in series and electrically connecting another portion of the primary 3.0 coils in parallel. Moreover, it is possible to predefine the intensities of the ignitions at a particular instant and a particular location.
Control elements for controlling the ignition current can be connected' into the respective electric circuits of the primary coils. These control elements may comprise temperature sensors, temperature switches, time switches and transmitting and receiving circuits-.
Switching of the ignition current can thus be time-staggered, simultaneous, serial or randomly adjustable, as required, for example, in dependence on the temperature of the propellent charges powder or the prevailing humidity. The secondary circuit, also termed the receiving circuit, comprises at least one ignition plane, disposed in the powder chamber of the propellent charges, which is composed of an inert or consumable or combustible base body, one or more electrical igniters and an inert or consumable or combustible secondary coil which is electrically connected to the igniters. The same advantages are achieved for the design of the ignition plane as for the design of the primary circuit.
Control elements can be connected into the electric circuit of the igniters instead of into the primary circuit for the purpose of controlling the ignition current in the ignition planes. These control elements, likewise, can comprise temperature sensors and temperature switches, time switches and transmitting and receiving circuits. In this case, likewise, switching of the ignition current can be time-staggered, simultaneous, serial or randomly adjustable in dependence on the temperature, for example, of the propellent charges powder.
In the ignition planes, integrated circuits can be connected into the electric circuit of the igniters for the purpose of programming the ignition sequence.
Particularly in stand-by operation, with a cartridge loaded ready to fire, this offers the possibility, through inductive injection of, for example, a coded phase-, pulse- or frequency-modulated signal in the primary circuit, of programming the ignition planes as required by means of integrated circuits in dependence on the powder temperature in order to achieve a time-and temperature-dependent initiation of the ignition.
The advantages of the invention consist in the fact that it eliminates the above-mentioned disadvantages of conventional ignition, that initiation of ignition of the propellent charges powder is dependent on the powder temperature and is temporally and locally defined, as a result of which an increased performance is achieved in respect of the range and penetration power of the projectiles.
The invention is described more fully with reference to exemplifying embodiments, wherein:
Figure 1 shows a propellent charges body according to the invention, in partial section, Figure 2 shows a schematic representation of a series connection of primary coils, Figure 3 shows a schematic representation of a parallel connection of primary coils with control elements in the electric circuit, Figure 4 shows a schematic representation of a secondary circuit according to the invention with control elements in the electric circuit of the igniters and Figure 5 shows an assembly drawing of a primary and secondary circuit with integrated circuits in the electric circuits of the igniters.
_7_ In Figure 1, a propellant charges body 1 according to the invention is represented schematically in partial section. Cartridge case 2 surrounds the propellant charges 3. A cylindrical ignition body 5 is disposed in a longitudinal cylindrical recess 4 in the centre of the propellant charges body 1.
The section of the wall 6 of the cartridge case 2 shows the primary coils 7 embedded in the wall 6. There are three primary coils, the windings 8 of which, wound concentrically relative to the cartridge case, can be seen in the wall 6 of the cartridge case 2. The ignition current is supplied yia a metal ring 9 disposed on the end face 10 of the propellant charges 1S body 1. This ring 9 is connected to a current supply in the combustion chamber, not depicted here, when the propellant charges is inserted in it. In this exemplifying embodiment, the current feedback ll is also located in the wall 6 of the cartridge case 2 and leads from the end face 12 to a further ring 13 which is disposed concentrically relative to the ring 9, likewise on the end face 10 of the propellant charges body 1,. This ring 13 is likewise connected to a contact in the combustion chamber: While the contacts in the combustion chamber can consist of pins, it is advantageous if the contacts on the propellant charges body are annular since the contacts on the propellant charges body then always correspond to the contacts in the combustion chamber, irrespective of the position of the propellant charges body.
The secondary circuit 14 with the_ ignition tiers 15a, 15b and 15c is disposed in the section of the ignition body 5. The windings 16 of the three secondary coils 17a, 17b and 17c are shown in section. Connected to the secondary coils 17a, 17b and 17c are the igniters _8_ 18a, 18b and 18c respectively, which are visible in this case.
Figure 2 shows a schematic circuit diagram of a series connection of primary coils. The ignition current is carried from an ignition circuit drive 20 in which, for example, the instant of ignition is set, via the supply line 21, to a pin contact 22 in the combustion chamber, not shown here. The pin contact 22 is contacted by the ring 9, from which the primary coils 7a, 7b and 7c are supplied with the ignition current. The primary coils 7a, 7b and 7c are embedded in the wall 6 of the cartridge case 2, as was shown in Figure 1. The feedback 11 leads to the ring 13 which is connected to a pin contact 23, which is likewise disposed in the combustion chamber, not shown here. From this pin contact 23, the feedback 24 leads back to the ignition circuit drive 20.
Figure 3 differs from Figure 2 in that the primary coils are connected not in series, but in parallel to one another. Features corresponding to those of the preceding exemplifying embodiment are denoted by the same references. The supply line 21 coming from the ignition circuit drive 20 divides into three branches 21a, 21b and 21c. Each of these branches leads to its own pin contact 22a; 22b and 22c. Each of these contacts an individual ring 9a, 9b and 9c respectively.
Each of these rings is connected to a supply line 25a, 25b and 25c respectively, each of which individually leads to the primary coils 107x, 107b and 107c respectively located in the wall 6 of the cartridge case 2, supplying them with the required ignition current. Each of these primary coils 107a, 107b and 107c is individually connected to the current feedback 11 which,. analogously to Figure 2, leads back to the ignition circuit drive 20.
Disposed in each of the ignition lines 21a, 21b and 21c are switching elements 26a, 26b and 26c respectively.
In this exemplifying embodiment, these are temperature-dependent switching elements by means of which the.
level and duration of the induction current in the 'individual primary coils can be predefined in dependence on the temperature of the powder charge or on the ambient temperature. In this way the strength of the generated magnetic field is also determined in each case, this having corresponding effects on the voltages induced in the secondary coils of the secondary circuit.
Figure 4 shows a schematic circuit diagram of the secondary ignition circuit 14. It corresponds to the secondary ignition circuit in Figure 1. The three ignition tiers 15a, 15b and 15c comprise the secondary coils 17a, 17b and 17c respectively. By contrast with Figure 1, in which only one igniter 18a, 18b and 18c respectively can be seen, in this case the actual number of igniters in each case is represented.
Accordingly, the ignition tier 15a comprises a further igniter 18d, the ignition tier 15b comprises two further igniters 18e and 18f and the ignition tier 25c also comprises two further igniters 18g and 18h. A
different ignition intensity can thus be set on each of the ignition tiers. Switching elements can also be disposed in the electric circuit 27 of the respective ignition tiers instead of in the electric circuit of the ignition circuit drives, as shown in Figure 3. In this exemplifying embodiment, the switching elements 26a, 26b, 26c are likewise temperature-dependent switching elements. The electric circuits of the respective ignition planes can then be closed and the igniters activated only when the switching elements close the electric circuits and do not leave them open due to an inadmissible temperature of the propellent charges.
S
As evident from Figures 2, 3 and 4, the secondary ignition circuit in Figure 4 can in each case be coordinated with one of the primary ignition circuits arranged above it.
Figure 5 shows one possible coordinations.
Coordination of Figure 2 with Figure 4, takes place for this exemplifying embodiment. Unlike the previous exemplifying embodiments, a programming signal 28 is added to the ignition circuit drive. When the cartridge is loaded ready to fire, the ignition tiers can be programmed by means of the integrated circuits in dependence on the powder temperature; for example through inductive injection of a coded phase-, pulse-or frequency-modulated signal into the primary circuit, so that a time- and temperature-dependent initiation of the ignition can be achieved. In this exemplifying embodiment, the integrated circuits 29a, 29b and 29c are disposed in the electric circuits 27 of the ignition tiers 15a, 15b and 15c respectively. The signal transmission is effected prior to the actual ignition operation, i.e., prior to the induction of the ignition current, and is represented in this exemplifying embodiment by the reference 30.
ACCORDING TO THE INDUCTION PRINCIPLE
The invention concerns an ignition system for propellent charges, which system functions according to the induction principle, according to the pre-characterizing clause of the first claim.
Ignition systems for propellent charges which function according to the induction principle have been known for quite a long time and are described in, for example, European Patent Specification EP 0 526 389 B1.
Known from this patent application is a device for firing ammunition which has a combustion chamber which can accommodate several propellent charges bodies comprising a propellent charges and an ignition agent for igniting the propellent charges. A fixed primary coil, which receives an ignition signal, is provided at the combustion chamber, the primary coil surrounding the combustion chamber. Disposed in each propellent charges body is a secondary coil which is connected to an ignition agent resistance which initiates the ignition agent.
These ignition systems for propellent charges and those functioning according to a comparable principle have the disadvantage that unwanted differential gas pressures can occur upon the ignition of the propellent charges, especially in the lower temperature range.
These differential gas pressures can lead to uncontrolled increases in pressure in the combustion chamber and damage or even destroy the weapon system.
Attempts have been made to prevent this unwanted effect by reducing the quantity of powder used. This, however, results in significantly poorer performance of the ammunition in respect of the range and penetration power of the projectiles.
The object of the invention is therefore to improve the known ignition system for propellent charges.
This object is achieved by means of the characterizing features of the first claim. Advantageous embodiments of the invention are claimed in the sub-claims.
According to the invention, and in contrast to the known ignition systems, the at least one primary coil is disposed not around the combustion chamber, but in or on the cartridge case wall. The primary coil can thus be matched to the. size of the propellent charges, as a result of which the required ignition energy is limited to the particular need. The cartridge case wall is also advantageously suitable as a winding former, it also being possible for the windings to be run into the interior of the case wall, where they can be protected through being covered by layers of the case wall. Printed circuits applied to the cartridge case wall can also be used as a primary coil instead of wire windings.
The winding density of the primary coil can be advantageously constant over the length of the cartridge case. Production is consequently very simple and a uniform induction with a homogeneous magnetic field is achieved.
It can be advantageous, particularly when the propellent charges has several ignition systems, if the winding density is variable over the length of the cartridge case. The density of the windings for generating the inductions can be greater at the location.of secondary coils than in the area of the intervals between the secondary coils.
The primary coil can also be divided into several individual coils arranged spatially in series with different winding densities instead of in one coil.
This is already then the case if, instead of one propellant charges body,-several propellant charges bodies, each having its own cartridge wall, are combined to form a total charge. Moreover, the primary coils can be optimally assigned to the secondary coils and, consequently, also distributed variably over the length of the cartridge case.
Depending on the type of weapon, ammunition and propellant charges, both the primary coil and the cartridge case can be inert, i.e., be preserved upon combustion of the propellant charges. Alternatively, the primary coil and the cartridge case can be consumable, i.e., even burn away upan combustion of the propellant charges. Alternatively, the primary coil and the cartridge case can contribute to the burning of the propellant charges, by being themselves combustible. Coils made from the so-called printed conductors are particularly advantageous if the primary coils and the cartridge are consumable or combustible due to the fact that, unlike conductors made from wire, they can be produced from combustible or consumable materials.
Propellant charges are generally already available as propellant charges bodies of a determinate size.
Matching to the projectile type necessitates the assembly of the propellant charges bodies in the quantity required in each case. It is then advantageous if the wall of the cartridge case is composed.of a plurality of parts. Since each of the cartridge case parts has at least one primary coil the component cases must be electrically coupled., This electrical coupling can be, for example, conductive coupling, i.e., contact points adjoin when the cartridge cases are assembled. Alternatively, the electrical coupling can be capacitive. Capacitive coupling of the conductor surfaces, separated from one another by the cartridge case wall, can be effected through large-area coatings in the region of the points at which, for example, the component cases overlap. An inductive coupling of the component cases is also conceivable, induction coils which lie opposite one another following assembly of the component cases being disposed in the region of overlapping of the respective component cases.
Depending on the intended time sequence of ignition of the propellent charges, the individual primary coils can be electrically connected in series or electrically connected in parallel, In the first case, the level of the voltage induced in the respective secondary coils is dependent on the resistance of the coils of the primary circuit. In the second case, the same voltage is present in all primary coils.
It is also possible to combine the two electrical circuits of the primary coils, by electrically connecting a portion of the primary coils in series and electrically connecting another portion of the primary 3.0 coils in parallel. Moreover, it is possible to predefine the intensities of the ignitions at a particular instant and a particular location.
Control elements for controlling the ignition current can be connected' into the respective electric circuits of the primary coils. These control elements may comprise temperature sensors, temperature switches, time switches and transmitting and receiving circuits-.
Switching of the ignition current can thus be time-staggered, simultaneous, serial or randomly adjustable, as required, for example, in dependence on the temperature of the propellent charges powder or the prevailing humidity. The secondary circuit, also termed the receiving circuit, comprises at least one ignition plane, disposed in the powder chamber of the propellent charges, which is composed of an inert or consumable or combustible base body, one or more electrical igniters and an inert or consumable or combustible secondary coil which is electrically connected to the igniters. The same advantages are achieved for the design of the ignition plane as for the design of the primary circuit.
Control elements can be connected into the electric circuit of the igniters instead of into the primary circuit for the purpose of controlling the ignition current in the ignition planes. These control elements, likewise, can comprise temperature sensors and temperature switches, time switches and transmitting and receiving circuits. In this case, likewise, switching of the ignition current can be time-staggered, simultaneous, serial or randomly adjustable in dependence on the temperature, for example, of the propellent charges powder.
In the ignition planes, integrated circuits can be connected into the electric circuit of the igniters for the purpose of programming the ignition sequence.
Particularly in stand-by operation, with a cartridge loaded ready to fire, this offers the possibility, through inductive injection of, for example, a coded phase-, pulse- or frequency-modulated signal in the primary circuit, of programming the ignition planes as required by means of integrated circuits in dependence on the powder temperature in order to achieve a time-and temperature-dependent initiation of the ignition.
The advantages of the invention consist in the fact that it eliminates the above-mentioned disadvantages of conventional ignition, that initiation of ignition of the propellent charges powder is dependent on the powder temperature and is temporally and locally defined, as a result of which an increased performance is achieved in respect of the range and penetration power of the projectiles.
The invention is described more fully with reference to exemplifying embodiments, wherein:
Figure 1 shows a propellent charges body according to the invention, in partial section, Figure 2 shows a schematic representation of a series connection of primary coils, Figure 3 shows a schematic representation of a parallel connection of primary coils with control elements in the electric circuit, Figure 4 shows a schematic representation of a secondary circuit according to the invention with control elements in the electric circuit of the igniters and Figure 5 shows an assembly drawing of a primary and secondary circuit with integrated circuits in the electric circuits of the igniters.
_7_ In Figure 1, a propellant charges body 1 according to the invention is represented schematically in partial section. Cartridge case 2 surrounds the propellant charges 3. A cylindrical ignition body 5 is disposed in a longitudinal cylindrical recess 4 in the centre of the propellant charges body 1.
The section of the wall 6 of the cartridge case 2 shows the primary coils 7 embedded in the wall 6. There are three primary coils, the windings 8 of which, wound concentrically relative to the cartridge case, can be seen in the wall 6 of the cartridge case 2. The ignition current is supplied yia a metal ring 9 disposed on the end face 10 of the propellant charges 1S body 1. This ring 9 is connected to a current supply in the combustion chamber, not depicted here, when the propellant charges is inserted in it. In this exemplifying embodiment, the current feedback ll is also located in the wall 6 of the cartridge case 2 and leads from the end face 12 to a further ring 13 which is disposed concentrically relative to the ring 9, likewise on the end face 10 of the propellant charges body 1,. This ring 13 is likewise connected to a contact in the combustion chamber: While the contacts in the combustion chamber can consist of pins, it is advantageous if the contacts on the propellant charges body are annular since the contacts on the propellant charges body then always correspond to the contacts in the combustion chamber, irrespective of the position of the propellant charges body.
The secondary circuit 14 with the_ ignition tiers 15a, 15b and 15c is disposed in the section of the ignition body 5. The windings 16 of the three secondary coils 17a, 17b and 17c are shown in section. Connected to the secondary coils 17a, 17b and 17c are the igniters _8_ 18a, 18b and 18c respectively, which are visible in this case.
Figure 2 shows a schematic circuit diagram of a series connection of primary coils. The ignition current is carried from an ignition circuit drive 20 in which, for example, the instant of ignition is set, via the supply line 21, to a pin contact 22 in the combustion chamber, not shown here. The pin contact 22 is contacted by the ring 9, from which the primary coils 7a, 7b and 7c are supplied with the ignition current. The primary coils 7a, 7b and 7c are embedded in the wall 6 of the cartridge case 2, as was shown in Figure 1. The feedback 11 leads to the ring 13 which is connected to a pin contact 23, which is likewise disposed in the combustion chamber, not shown here. From this pin contact 23, the feedback 24 leads back to the ignition circuit drive 20.
Figure 3 differs from Figure 2 in that the primary coils are connected not in series, but in parallel to one another. Features corresponding to those of the preceding exemplifying embodiment are denoted by the same references. The supply line 21 coming from the ignition circuit drive 20 divides into three branches 21a, 21b and 21c. Each of these branches leads to its own pin contact 22a; 22b and 22c. Each of these contacts an individual ring 9a, 9b and 9c respectively.
Each of these rings is connected to a supply line 25a, 25b and 25c respectively, each of which individually leads to the primary coils 107x, 107b and 107c respectively located in the wall 6 of the cartridge case 2, supplying them with the required ignition current. Each of these primary coils 107a, 107b and 107c is individually connected to the current feedback 11 which,. analogously to Figure 2, leads back to the ignition circuit drive 20.
Disposed in each of the ignition lines 21a, 21b and 21c are switching elements 26a, 26b and 26c respectively.
In this exemplifying embodiment, these are temperature-dependent switching elements by means of which the.
level and duration of the induction current in the 'individual primary coils can be predefined in dependence on the temperature of the powder charge or on the ambient temperature. In this way the strength of the generated magnetic field is also determined in each case, this having corresponding effects on the voltages induced in the secondary coils of the secondary circuit.
Figure 4 shows a schematic circuit diagram of the secondary ignition circuit 14. It corresponds to the secondary ignition circuit in Figure 1. The three ignition tiers 15a, 15b and 15c comprise the secondary coils 17a, 17b and 17c respectively. By contrast with Figure 1, in which only one igniter 18a, 18b and 18c respectively can be seen, in this case the actual number of igniters in each case is represented.
Accordingly, the ignition tier 15a comprises a further igniter 18d, the ignition tier 15b comprises two further igniters 18e and 18f and the ignition tier 25c also comprises two further igniters 18g and 18h. A
different ignition intensity can thus be set on each of the ignition tiers. Switching elements can also be disposed in the electric circuit 27 of the respective ignition tiers instead of in the electric circuit of the ignition circuit drives, as shown in Figure 3. In this exemplifying embodiment, the switching elements 26a, 26b, 26c are likewise temperature-dependent switching elements. The electric circuits of the respective ignition planes can then be closed and the igniters activated only when the switching elements close the electric circuits and do not leave them open due to an inadmissible temperature of the propellent charges.
S
As evident from Figures 2, 3 and 4, the secondary ignition circuit in Figure 4 can in each case be coordinated with one of the primary ignition circuits arranged above it.
Figure 5 shows one possible coordinations.
Coordination of Figure 2 with Figure 4, takes place for this exemplifying embodiment. Unlike the previous exemplifying embodiments, a programming signal 28 is added to the ignition circuit drive. When the cartridge is loaded ready to fire, the ignition tiers can be programmed by means of the integrated circuits in dependence on the powder temperature; for example through inductive injection of a coded phase-, pulse-or frequency-modulated signal into the primary circuit, so that a time- and temperature-dependent initiation of the ignition can be achieved. In this exemplifying embodiment, the integrated circuits 29a, 29b and 29c are disposed in the electric circuits 27 of the ignition tiers 15a, 15b and 15c respectively. The signal transmission is effected prior to the actual ignition operation, i.e., prior to the induction of the ignition current, and is represented in this exemplifying embodiment by the reference 30.
Claims (20)
1. Ignition system for propellent charges which functions according to the induction principle, the propellent charges being. ignited in a combustion chamber of a device for firing ammunition and the propellent charges comprising induction coils in which the ignition voltage for ignition of the connected igniters is induced by means of a primary coil, characterized in that the propellent charges bodies (1) have a cartridge case (2), the wall (6) of which caries at least one primary coil (7a, 7b, 7c; 107a, 107b, 107c).
2. Ignition system according to Claim 1, characterized in that the at least one primary coil (7a, 7b, 7c; 107a, 107b, 107c) is disposed coaxially in or on the wall (6) of the cartridge case (2).
3. Ignition system according to either of Claims 1 or 2, characterized in that the density of the winding of the primary coil (7a, 7b, 7c; 107a, 107b, 107c) is constant over the length of the cartridge case (2).
4. Ignition system according to either of Claims 1 or 2, characterized in that the density of the winding of the primary coil is variable over the length of the cartridge case (2).
5. Ignition system according to any one of Claims 1 to 4, characterized in that the primary coil (7a, 7b, 7c; 107a, 107b, 107c) and the cartridge case (2) are inert during combustion.
6. Ignition system according to any one of Claims 1 to 4, characterized in that the primary coil (7a, 7b, 7c; 107a, 107b, 107c) and the cartridge case (2) are consumable during combustion.
7. Ignition system according to any one of Claims 1 to 4, characterized in that the primary coil (7a, 7b, 7c; 107a, 107b, 107c) and the cartridge case (2) are combustible.
8. Ignition system according to any one of Claims 1 to 7, characterized in that the wall (6) of the cartridge case (2) is composed of a plurality of parts and the electric coupling of the component cases is conductive.
9. Ignition system according to any one of Claims 1 to 7, characterized in that the wall (6) of the cartridge case (2) is composed of a plurality of parts and the electric coupling of the component cases is capacitive.
10. Ignition system according to any one of Claims 1 to 7, characterized in that the wall (6) of the cartridge case (2) is composed of a plurality of parts and the electric coupling of the component cases is inductive.
11. Ignition system according to any one of Claims 1 to 10, characterized in that the primary circuit is divided into several individual coils (7a, 7b, 7c; 107a, 107b, 107c) arranged spatially in series.
12. Ignition system according to Claim 11, characterized in that the individual primary coils are distributed at variable distances over the length of the cartridge case (2).
13. Ignition system according to either of Claims 11 or 12, characterized in that the individual primary coils (7a, 7b, 7c) are electrically connected in series.
14. Ignition system according to either of Claims 11 or 12, characterized in that the individual primary coils (107a, 107b, 107c) are electrically connected in parallel.
15. Ignition system according to either of Claims 13 or 14, characterized in that a portion of the primary coils are electrically connected in series and the other portion of the primary coils are electrically connected in parallel.
16. Ignition system according to any one of Claims 1 to 15, characterized in that control elements (26a, 26b, 26c) are connected into the respective electric circuits of the primary coils (107a, 107b, 107c) for the purpose of controlling the ignition current.
17. Ignition system according to any one of Claims 1 to 16, characterized in that the secondary circuit (14) comprises at least one ignition tier (15a, 15b, 15c) disposed in the propellent charges (3).
18. Ignition system according to Claim 17, characterized in that the ignition tiers (15a, 15b, 15c) are composed of an inert or consumable or combustible base body with one or more electrical igniters (18a to 18h) and an inert or consumable or combustible secondary coil (17a, 17b, 17c) which are each electrically connected to the igniters (18a to 18h).
19. Ignition system according to any one of Claims 1 to 18, characterized in that, in the ignition tiers (15a, 15b, 15c), control elements (29a, 29b, 29c) are connected into the electric circuits (27) of the igniters (18a to 18h) for the purpose of controlling the respective ignition current.
20. Ignition system according to any one of Claims 1 to 15, characterized in that, in the ignition tiers (15a, 15b, 15c), integrated circuits (29a, 29b, 29c) are connected into the electric circuits (27) of the igniters (18a to 18h) for the purpose of programming the ignition sequence.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19904195.4 | 1999-02-03 | ||
| DE19904195 | 1999-02-03 | ||
| DE19962594.8 | 1999-12-23 | ||
| DE19962594A DE19962594B4 (en) | 1999-02-03 | 1999-12-23 | Ignition system for propellants, which works according to the induction principle |
| PCT/EP2000/000273 WO2000046551A1 (en) | 1999-02-03 | 2000-01-15 | Ignition system for propelling charges which functions according to the induction principle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2361674A1 true CA2361674A1 (en) | 2000-08-10 |
Family
ID=26051641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002361674A Abandoned CA2361674A1 (en) | 1999-02-03 | 2000-01-15 | Ignition system for propelling charges which functions according to the induction principle |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1151229A1 (en) |
| CA (1) | CA2361674A1 (en) |
| IL (1) | IL144201A0 (en) |
| WO (1) | WO2000046551A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2650884B1 (en) * | 1989-08-08 | 1991-10-11 | Commissariat Energie Atomique | CHARGE FOR ELECTROTHERMAL LAUNCHER |
| DE3931896A1 (en) * | 1989-09-25 | 1991-04-04 | Wegmann & Co | Mortar system for smoke candles - uses soft magnetic rings on shot cooperating with Hall sensors and magnets on pot side |
| DE4003320C2 (en) * | 1990-02-05 | 1995-02-09 | Rheinmetall Gmbh | Projectile for electrothermal accelerators |
| EP0526389B1 (en) | 1991-06-29 | 1997-01-29 | Dynamit Nobel GmbH Explosivstoff- und Systemtechnik | Device for launching ammunition |
| DE4220680A1 (en) * | 1991-06-29 | 1993-01-07 | Dynamit Nobel Ag | Appts. for using up munitions - has combustion chamber which receives propellant charge bodies and igniter along with prim. and sec. coils, yielding simultaneous ignition |
| DE19706605A1 (en) * | 1997-02-20 | 1998-08-27 | Dynamit Nobel Ag | Secondary coil for inductive ignition |
| FR2764369B1 (en) * | 1997-06-04 | 1999-12-17 | Lasers Et Tech Avancees Bureau | PLASMA FIRE SYSTEM OF ARTILLERY AMMUNITION |
-
2000
- 2000-01-15 WO PCT/EP2000/000273 patent/WO2000046551A1/en not_active Application Discontinuation
- 2000-01-15 EP EP00904917A patent/EP1151229A1/en not_active Ceased
- 2000-01-15 CA CA002361674A patent/CA2361674A1/en not_active Abandoned
- 2000-01-15 IL IL14420100A patent/IL144201A0/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP1151229A1 (en) | 2001-11-07 |
| WO2000046551A1 (en) | 2000-08-10 |
| IL144201A0 (en) | 2002-05-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |