RU2019726C1 - Universal thirster ignition system for internal combustion engine - Google Patents

Abstract

FIELD: engine engineering. SUBSTANCE: system has converter 1, capacitors 2,9,17, switches 3,8, switches 4,14, resistors 5,6,11,18,20, diodes 7, coil 10, and units 12,13. The circuit provide control of switches 3,8 so that capacitor 9 is charged impulsively not after oscillating discharge but during each stroke of recharging under the action of inductive coil 10. The switches are synchronized by a signal from a pickup of coil current made of resistor 11. EFFECT: higher frequency and energy of sparking. 2 dwg

Description

 The invention relates to universal capacitor ignition systems with continuous-pulse energy storage for internal combustion engines and can be used on vehicles and power plants with any type of ignition coil and ignition timing sensors.

 Known universal thyristor ignition system with continuously pulse energy storage, comprising a matching unit, a function block, a relaxation generator, a DC voltage converter, first and second storage capacitors, first and second electronic switches, a pulse shaper, a current limiting resistor, a dual switch and a reverse diode, and selected as a prototype. The prototype system is compatible with all types of ignition timing sensors and ignition coils and implements octane-corrector functions with a smooth change in the delay time of the ignition moment, multiple sparking during the entire piston stroke, emergency operation with continuous sparking, anti-theft device, has an increased frequency of multiple sparking, increased duration of the spark discharge and provides an increase in the energy of sparking during engine starting.

 The disadvantages of the prototype are the insufficient frequency of multiple sparking and the insufficient energy of sparking. These shortcomings are determined by the fact that in each cycle of multiple sparking, a relatively long time is required for recharging the first storage capacitor after it is completely discharged, and high-frequency oscillations are damped.

 The aim of the invention is to increase the frequency and energy of multiple sparking.

 This goal is achieved by the fact that in the ignition system, which contains a matching block in series with the inputs for connecting to various sensors of the ignition moment, a function block that implements the functions of an octane corrector and an anti-theft device, and a 2OR-NOT logical element, the second input of which is connected to the first output of the first resistor, and the output to the control input of the second electronic key, controlled by a low logic level signal and connecting the minus power source to the second output m of the first storage capacitor and with a negative output terminal of the DC-DC converter, the inputs of which are connected between the plus and minus of the power source, and the positive output terminal is connected to the first output of the first storage capacitor, with the power input of the second electronic switch and through a current-limiting resistor and connected in series with it parallel reverse diode, first electronic switch and serial second storage capacitor and primary winding of the ignition coil minus the power source, as well as the dual switch, capacitor, first, second and third resistors, additionally the fourth and fifth resistors are introduced, and the fourth resistor is connected in parallel to the current-limiting resistor through the first NC contacts of the dual switch, the fifth resistor is connected to the ignition coil to the minus source power supply, the first input of element 2 is NOT connected to the output of the function block through the second NC contacts of the dual switch, the second fixed circuit the first contact of which is connected with the plus and minus of the power source, respectively, through the capacitor and the second resistor, its second input is with the plus of the power source through the third resistor, its output is with the control input of the first electronic switch, and the second output of the first resistor is connected to the connection point of the secondary winding ignition coils with a fifth resistor.

Figure 1 shows a schematic diagram of the proposed ignition system; figure 2 - plot signals explaining the operation of the system, where
a) the signal at the output of the function block;
b) the signal at the output of the element 2 OR NOT;
c) an idealized signal at the second input of element 2 OR NOT;
d) voltage on the primary winding of the ignition coil;
d) current of the primary winding of the ignition coil.

 The ignition system contains a DC voltage converter 1, the inputs of which are connected between the plus and minus of the power source, and the first storage capacitor 2 is connected to its outputs. The positive output terminal of the converter 1 is connected to the power input of the second electronic switch 3 and through the first first disconnect contacts 4 of the dual switch and a fourth resistor 5, in parallel with which a current-limiting resistor 6 is connected, with the connection point of the reverse diode 7, the first output of the first electronic the key 8 and the first output of the second storage capacitor 9, the second output of which is connected through the serial primary winding 10 of the ignition coil and the fifth resistor 11 with a minus power supply, the second output of the key 8, the anode of the diode 7 and through the key 3 with the negative output terminal of the converter 1. Control the inputs of the keys 3 and 8 are connected to the input terminals of the connection to the ignition timing sensors via the serial matching unit 12, the function block 13, the second NC contacts 14 of the dual switch, the first input NTA 2 OR NOT 15 and its output. The fixed second make contact 16 of the dual switch is connected through the capacitor 17 to the plus, and through the second resistor 18 to the minus of the power source. The second input of the element 15 is connected through the first resistor 19 to the connection point of the resistor 11 and the primary winding 10 of the ignition coil, and through the third resistor 20 with the plus of the power source.

 The ignition system operates as follows.

 The dual switch is in the position shown in figure 1. After turning on the power at the output of the block of 13 functions, a signal of a high logical level is set, at the output of the element 2 OR NOT 15 - low, key 3 is unlocked, and key 8 is locked. The converter 1 starts to work, the capacitor 2 is charged, and at the same time the capacitor 9 is charged through the resistors 5 and 6 connected in parallel, the primary winding 10 of the ignition coil, resistor 11 and the public key 3. After the starter is turned on and during engine operation, at the time of sparking the signal of the ignition timing sensor at the input of the matching unit 12 and the delay of the octane corrector in the function block 13, a low logic level signal appears at the output of block 13 (Fig. 2, a), and a high logic output at the output of element 15 (Fig. 2, b) the key 3 is locked, the key 8 is unlocked, and the capacitor 9 starts an oscillating discharge through the primary winding 10 of the ignition coil and the resistor 11. At the first time, all the voltage of the capacitor 9 is applied to the winding 10 (Fig.2, g), and then, as increasing current in the winding 10 (Fig. 2, d), this voltage decreases and becomes equal to zero when the current of the winding 10 reaches a maximum (Fig. 2, d). Under the influence of electromagnetic energy accumulated in the ignition coil, the capacitor 9 begins to recharge through the reverse diode 7, the current through the resistor 11, which has a small resistance and acts as a current sensor, changes its direction. The voltage drop across the resistor 11 is summed at the second input of the element 15 with the bias voltage from the voltage divider collected on the high-resistance resistors 19 and 20.

 At the time when the voltage at the second input reaches the switching threshold of element 15 (Fig. 2, c), a low logic level signal appears at its output, key 8 is locked, and key 3 is unlocked. A pulse recharging of the capacitor 9 occurs from the capacitor 2 (the capacity of which significantly exceeds the capacitance of the capacitor 9) to the voltage of the converter 1, the current in the charge circuit increases (Fig. 2, e), the energy accumulated in the capacitor 9 again reaches its initial maximum value due to compensation of its part, which was spent on the formation of sparks and losses. When the charge current of the capacitor 9 stops (Fig. 2, e), a low logic level signal is installed at the second input of element 15 (Fig. 2, c), high at its output, and the keys 3 and 8 again change the state of conductivity. The next cycle of the discharge of the capacitor 9 begins, followed by its recharging and recharging from the capacitor 2, i.e. the system goes into self-oscillating mode. The oscillation frequency is determined by the inductance of the winding 10 of the ignition coil, the capacitance of the capacitor 9 and, to a small extent, the resistance of the resistors 6 and 5, the resistance of the resistor 5 being small, determined by the maximum allowable current of the keys 3 and 8, and it can even be shunted. Thus, the frequency of undamped oscillations is the maximum possible for this type of ignition coil, since in the self-oscillating process there are no pauses required in the prototype system for locking the keys.

 As follows from the above, in the process of generating undamped oscillations, the key 3 is unlocked only for the duration of the charge of the capacitor 9, therefore, the proposed ignition system automatically adapts to the ignition coil of any inductance, and the oscillation frequency is automatically set to the maximum possible. In this case, the current in the primary winding of the ignition coil and in the spark gap is close to sinusoidal. The energy of multiple sparking increases significantly, since it occurs in the form of continuous undamped oscillations, i.e. with constant and maximum amplitude. This sparking occurs until a high logic level signal appears at the output of the function block 13, after which the key 8 is locked and the key 3 is unlocked until the next signal from the ignition timing sensor is received at the input of block 12. To put the system into emergency continuous sparking, it is necessary to switch the double switch. At the same time, one resistor 6 remains in the charging circuit of the capacitor 9, and the first input of the element 15 is disconnected from the output of the function block 13 and connected to the connection point of the capacitor 17 and the resistor 18. After power is turned on for the time that the capacitor 17 is charged through the resistor 18 at the output of the element 15 low logic level signal, so key 8 is locked and key 3 is open. This time is necessary in order for converter 1 to charge capacitors 2 and 9 to full voltage. After the capacitor 17 is charged, the keys 3 and 8 are switched and the continuous process of self-generation of undamped oscillations begins, as described above. The frequency of these oscillations due to the disconnection of the resistor 5 is reduced so that the converter 1 can provide a sufficient voltage level on the secondary winding 10 of the ignition coil.

 In comparison with the prototype, the invention has the following advantages: a significantly increased frequency of multiple sparking, and due to the adaptability of the system, this frequency is automatically set to the maximum possible for any type of ignition coil, while in the prototype system the frequency is forcibly set based on the coil with maximum inductance in order to exclude "through" currents when switching to a coil with a lower inductance; a significant increase in the energy of sparking, not only due to the undamped nature of the oscillations, but also due to the adaptability of the system, which ensures the absence of pauses between individual clock cycles in the cycle of repeated sparking at any inductance of the ignition coil.

Claims (1)

 UNIVERSAL THYRISTOR IGNITION SYSTEM, containing a matching block in series, the inputs of which are inputs for connecting various sensors of the ignition moment, a function block that implements the functions of an octane corrector and an anti-theft device, and a logical element 2OR - NOT, the second input of which is connected to the first output of the first resistor , and the output is to the control input of the first electronic key controlled by a low logic level signal, the first and second conclusions of which are respectively connected to common the first bus, the first output of the first storage capacitor and the negative output of the DC / DC converter, the inputs of which are connected between the plus and minus, which is connected to the common bus of the power supply, and the positive output is connected to the second output of the first storage capacitor, with the power input of the first electronic of the key and through the current-limiting resistor and the reverse diode connected to it, the second electronic switch and the second storage capacitor and series the primary winding of the ignition coil - with a common bus, as well as a dual switch, capacitor, second and third resistors, characterized in that, in order to increase the frequency and energy of multiple sparking, the fourth and fifth resistors are introduced, and the fourth resistor is connected in parallel to the current-limiting one through the first disconnecting contacts of the dual switch, the first and second terminals of the fifth resistor are connected respectively to the output terminal of the primary winding of the ignition coil, with a common bus, the first input of element 2 OR - NOT connected to the output of the function block through the second NC contacts of the dual switch, the second NC contact of which is connected to the plus of the power source and the common bus, respectively, through the capacitor and the second resistor, its second input - with the plus of the power source through the third resistor, its output - with the input control of the second electronic key, and the second terminal of the first resistor of the connection with the input terminal of the secondary winding of the ignition coil and the first terminal of the fifth resistor.

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