CS226539B1 - Circuitry of capacitor type ignition system for explosion engines - Google Patents

Description

The invention relates to the connection of a condenser ignition system of spark ignition engines and the connection of a stabilization circuit. The circuit is primarily designed for small and sports motorcycles, which do not have an electric battery in their network.

A variety of voltage stabilization methods are known for spark ignition engine systems. The simplest situation is for vehicles that have an electric battery in their mains and the mains voltage is maintained at a constant voltage regulator that controls the dynamo or alternator. Here, constant spark energy can be achieved by simple voltage transfer, usually with the aid of a semiconductor inverter. Another stabilization method is to supply the ignition system with a variable width pulse · supplied by the pulse transformer. The pulse width is derived from the magnitude of the current passing through the pulse transformer input circuit. The situation is more difficult if neither the battery nor the voltage regulator is used in the vehicle's electrical network. For stabilization purposes, a variety of circuits have been designed to switch electrically or mechanically the storage capacities of the ignition system or to change the rectifier from a doubler to the usual one-way or two-way connection.

These circuits are usually stepped, the regulation is insufficient and practically only serves to prevent the destruction of ignition circuits by excessive voltage. However, they are not sufficiently reliable and often damage themselves, resulting in subsequent damage to the semiconductor switch. To sum up, if voltage regulation is not sufficient, the ignition circuit does not spark at low speeds and starting the engine is difficult. If the voltage at low speed is selected so that the spark energy is sufficient, then at high engine speed, the ignition circuit components are subject to excessively high voltage. Then the components have to be dimensioned accordingly, which leads to a multiple extension of the equipment, as the price of the components increases sharply with the required quality of the semiconductors with respect to the voltage resistance. At the same time, this voltage is unnecessarily high, since a much smaller value is sufficient to provide the required spark energy. The problem of voltage stabilization is also solved by the connection of a capacitor system, which has the auxiliary winding of the voltage limiter connected on the secondary side of the power transformer. The wiring meets the stabilization requirements, but the DC saturation mode of the transformer core necessitates the choice of a larger core, which increases the size and weight of the ignition block. Also, the limiter components mean some circuit costs and the heat sink modification increases labor.

These disadvantages are overcome by the connection of the spark ignition condenser ignition system of the invention, wherein the ignition condenser is fed via a rectifier and a transformer, from a permanent magnet alternator to which the primary winding of the transformer with the core has a primary winding ignition capacitor connected in series with diode connected to terminals of secondary winding.

The main advantages of the method according to the invention are that the stabilizer does not work with the DC saturation of the transformer core, so that the core can be smaller and lighter. Furthermore, the components of the limiter are eliminated, which also reduces the dimensions, weight and cost of ignition circuits.

The attached figure shows the circuit diagram of the ignition circuit. Several alternator stator coils 1 are connected in series and their output terminals a, b are connected to the primary winding 2 of the core transformer 3. The start of c of secondary winding 4 is connected to the first terminal e of capacitor 6 and end of d of secondary winding 4 to cathode The leads e and f of the capacitor 6 are further connected to a switching circuit of an ignition system, not shown. The circuit works by inducing a relatively low voltage in the coil 1 of the alternator stator at low speed, as a result of which the current of the transformer primary winding 2 is so high that the core 3 of the transformer is not supersaturated and is sufficient to generate an ignition impulse of energy:

A = —I-CU ² where

And the energy of the ignition pulse

C capacitor capacity iU voltage on capacitor

It can be seen from the above relationship that the effect of voltage variation on the ignition pulse energy is considerable. If the alternator rotor speed is increased, a higher voltage is induced in the stator coils 1, leading to an increase in current through the primary winding 2 of the transformer. If this current is increased to such an extent that the transformer core 3 is supersaturated, a higher voltage is induced in the secondary winding 4 than at low rotor speeds, but increasing the voltage is not a linear speed function. As the current in the transformer primary winding 2 increases, the supersaturation of the core 3 increases until the voltage increment on the secondary winding 4 ceases. Voltage stabilization also contributes to increasing the number of ignition pulses with increasing speed and hence the alternator load, which again leads to a drop in the peak voltage on the capacitor

6.

Also, the frequency increase given by the speed increase contributes to voltage stabilization as the losses in the iron core increase.

Claims (1)

Wiring for spark ignition condenser ignition system, wherein the spark capacitor is powered by a rectifier and transformer from a permanent magnet alternator, characterized in that a primary winding (2) is connected to the output terminals (a), (b) of the inventive alternator coil (1) ) a transformer with a core (3) having, at the terminals (c), (dj of the secondary winding [4] connected a ignition capacitor (6) in series with the diode (5).