Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
  • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
  • F02P7/06—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle
  • F02P7/067—Electromagnetic pick-up devices, e.g. providing induced current in a coil
  • F02P7/07—Hall-effect pick-up devices
• • H—ELECTRICITY
  • H03—ELECTRONIC CIRCUITRY
  • H03K—PULSE TECHNIQUE
  • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
  • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
  • H03K17/965—Switches controlled by moving an element forming part of the switch
  • H03K17/97—Switches controlled by moving an element forming part of the switch using a magnetic movable element

Definitions

• the invention relates to an electrical signal generator with a Hall generator according to the preamble of the main claim.
• the Hall generator and the associated amplifier circuit are spatially combined and connected via several lines (US Pat. No. 3,671,767).
• the amplifier circuit which is connected to ground, is connected to a supply voltage via a connecting line and an electrical signal dependent on the magnetic field on the Hall generator is output via an additional connecting line (output). Since the Hall generator with the amplifier stage must be arranged directly at a measuring point, but the control or evaluation circuit is usually spatially separated from it, relatively long connecting lines are required to connect such a signal generator, which are susceptible to faults.
• When using Hall generators in motor vehicles are exposed to the connection lines due to vibrations, temperature changes and the like. Particularly heavy loads.
• particularly high safety requirements are made for the use of the Hall generators in the motor vehicle, for example for controlling the ignition in a contactless ignition system.
• the aim of the present solution is to improve the functional reliability of the electrical signal transmitters with a Hall generator by reducing the connection lines for the Hall generator and for the amplifier circuit spatially combined therewith.
• the electrical signal generator according to the invention with the characterizing features of the main claim has the advantage that the amplifier circuit connected to ground is connected to the Hall generator via only one supply line, via which the electrical signal dependent on the magnetic field on the Hall generator is also emitted, and as a result the functional reliability is increased. This solution is more reliable and more cost-effective due to the saving of a special connecting line for signal output. Another advantage is that an integrated circuit can be used for the amplifier circuit of the Hall generator, the supply voltage of which may vary within wide limits.
• the Hall generator is combined with the amplifier circuit and the load resistor to form a unit connected to ground.
• the supply line is connected at one end to this unit and at the other end it is connected to the current measuring resistor, the threshold circuit and a stabilized DC voltage.
• FIG. 1 An embodiment of the invention is shown in the drawing and explained in more detail in the following description.
• the figure shows the circuit structure of the electrical signal generator with a Hall generator for controlling an ignition system.
• the figure shows a high-voltage capacitor ignition system for a multi-cylinder internal combustion engine, which is connected to the direct voltage of an accumulator battery 10 via the electrical system of a motor vehicle.
• the primary circuit of the ignition system is supplied with electrical energy via a converter 11.
• the primary circuit comprises the primary winding 12a of an ignition coil 12 and an ignition capacitor 13 which is connected to an output of the converter 11 via a charging diode 14.
• the second output of the converter 11 like the one end of the primary winding 12a and the negative connection of the accumulator battery 10, are connected to ground.
• the secondary winding 12b of the ignition coil 12 is to be connected to a plurality of spark plugs 16 via an ignition distributor 15, only one of which is shown.
• an ignition thyristor 17 Parallel to the series connection of the ignition capacitor 13 with the primary winding 12a is an ignition thyristor 17 which is switched to the conductive state by a control circuit at the time of ignition.
• the control circuit is implemented here by an electrical signal transmitter, which contains a Hall generator 18.
• the Hall generator 18 is influenced by the magnetic field of a permanently arranged permanent magnet 19, a rotating magnetic diaphragm driven by the internal combustion engine
• the amplifier circuit 21 cyclically interrupts the magnetic field on the Hall generator 18 when the internal combustion engine is operating.
• the outputs of the Hall generator 18 are connected to the inputs of an amplifier circuit 21.
• the amplifier circuit 21 The amplifier circuit
• the Hall generator 18 are grounded on the one hand and are connected to a supply voltage via a supply line 22 and a current measuring resistor 23 on the other hand.
• the supply voltage is a stabilized DC voltage of 6.3 V, which drops across an appropriately dimensioned Z diode 24 connected to ground.
• the Zener diode 24 is on the anode side via a resistor 25 on the positive pole of the battery 10
• Output resistor 27 is connected to ground.
• the collector of the control transistor 26 is also connected to the control electrode 17a of the ignition thyristor 17.
• the output of the amplifier circuit 2.1 there is an output transistor 28 with an open collector connection and with an emitter on ground.
• the open collector connection of the output transistor 28 is connected to a load resistor 29, which in turn is connected to the supply line 22.
• the amplifier circuit 21 is designed as an IC module, which operates at an applied voltage of 4-20 V.
• the Hall generator 18 is combined with the amplifier circuit 21, the output transistor 28 and the load resistor 29 to form a compact unit 30 and housed together with the permanent magnet 19 and a flux guide plate, not shown, in a grounded housing. Via the supply line 22, this unit 30 is connected to the current measuring resistor 23, the threshold circuit to the control transistor 26 and to the stabilized DC voltage at the Zener diode 24.
• the Hall generator 18 generates a voltage at its outputs signal by which the amplifier circuit 21 is reversed.
• the output transistor 28 now comes into the current-carrying state and a current flows through the measuring resistor 23, the supply line 22, the load resistor 29 and the output transistor 28 that the control transistor 26 is switched through to the current-conducting state (> 1 V when the control transistor 26 is not connected).
• the stabilized DC voltage of the Zener diode 24 thus passes via the control transistor 26 to the control connection 17a of the ignition thyristor 17, as a result of which this is also controlled in the current-carrying state.
• the ignition capacitor 13 can now discharge via the ignition thyristor 17 and the primary winding 12a.
• the sudden current surge when the ignition capacitor 13 is discharged generates a high-voltage pulse in the secondary winding 12b, which pulse reaches the one of the spark plugs 16 via the distributor 15 and triggers an ignition spark there.
• the Hall generator 18 is now shielded again by the aperture 20 from the magnetic field of the permanent magnet 19, the output transistor 28 is thereby controlled again in the blocking state and the control transistor 26 thus also returns to the blocking state.
• the ignition capacitor 13 is now recharged via the converter 11 in preparation for a further ignition process. The process already discussed is repeated in a cyclical sequence.
• the invention is not limited to the exemplary embodiment, since the electrical signal transmitter according to the invention can also be used for other switching operations, for example as a speed transmitter or as a dead center transmitter in a motor vehicle.
• the amplifier circuit 21 is connected to the Hall generator 18 via a supply line 22 with a current measuring resistor 23 to a supply voltage, that the output of the amplifier circuit also a load resistor 29 connected to the supply line 22 depending on the voltage of the Hall generator 18 to ground switches and that a threshold circuit is arranged in parallel to the current measuring resistor 23, which is reversed by the voltage drop across the current measuring resistor 23 as soon as the load resistor 29 in the output of the amplifier circuit 21 is switched to ground. Since the voltage fluctuations for supplying the Hall generator 18 and the amplifier circuit 21 by switching the load resistor 29 on and off lie within the limits permitted for the function of these parts, it is possible to connect the grounded electrical signal transmitter according to the invention via only one line. Via this line 22 there is on the one hand the voltage supply of the electrical signal transmitter and on the other hand the signal output.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Ignition Installations For Internal Combustion Engines (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=6201677

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• 1983
  • 1983-06-16 DE DE19833321795 patent/DE3321795A1/de not_active Withdrawn
• 1984
  • 1984-05-16 WO PCT/DE1984/000110 patent/WO1985000081A1/de unknown
  • 1984-05-16 AU AU29615/84A patent/AU2961584A/en not_active Abandoned
  • 1984-05-16 EP EP84901972A patent/EP0145731A1/de not_active Withdrawn
  • 1984-06-14 IT IT21409/84A patent/IT1175506B/it active

Non-Patent Citations (1)

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