초록 ▼

An ignition system and method for internal combustion engines with which a reliable triggering of an ignition spark is provided with control of the ignition process over the entire firing duration, wherein an excessive stress on the ignition coil and spark plug is avoided. By detecting the primary c

An ignition system and method for internal combustion engines with which a reliable triggering of an ignition spark is provided with control of the ignition process over the entire firing duration, wherein an excessive stress on the ignition coil and spark plug is avoided. By detecting the primary current and evaluating it in a control loop, the state of the secondary circuit can be detected reliably. In the case of a disturbance, for example at strongly spent spark plug, the ignition current is immediately readjusted via the control circuit in order to avoid a disruption in spark. This ignition current control thus reacts automatically to sources of defect on the secondary side current.

대표청구항 ▼

1. A method for ignition for internal combustion engines with an ignition coil (3) with the primary circuit (P) and secondary circuit (S) anda spark plug (5) provided in the secondary circuit (S), wherein the ignition current is a pulse signal which is controlled by pulse width modulation in the pri

1. A method for ignition for internal combustion engines with an ignition coil (3) with the primary circuit (P) and secondary circuit (S) anda spark plug (5) provided in the secondary circuit (S), wherein the ignition current is a pulse signal which is controlled by pulse width modulation in the primary circuit (P), wherein the method comprises:measuring the primary current actually in the primary current circuit (P),comparing the measured primary current with a predetermined target current, andreadjusting the pulse width modulation and/or a frequency modulation of the pulse signal in the primary circuit (P) based on the comparison result, in order to achieve the desired current, andwherein an instantaneous flyback current induced in the ignition coil (3) is measured, and the instantaneous primary current and the instantaneous flyback current are added to give a total current, and the total current is compared with the predetermined target ignition current. 2. The method according to claim 1, wherein a ramp-shaped rising signal is superimposed on the primary circuit during the firing period of the spark plug. 3. The method according to claim 1, wherein the initial ignition current is not controlled until ignition sparking. 4. A method for ignition for internal combustion engines with an ignition coil (3) with the primary circuit (P) and secondary circuit (S) anda spark plug (5) provided in the secondary circuit (S), wherein the ignition current is a pulse signal which is controlled by pulse width modulation in the primary circuit (P), wherein the method comprises:measuring the primary current actually in the primary current circuit (P),comparing the measured primary current with a predetermined target current, andreadjusting the pulse width modulation and/or a frequency modulation of the pulse signal in the primary circuit (P) based on the comparison result, in order to achieve the desired current, andwherein by integration of the total current the total energy supplied to the ignition coil (3) is determined and on reaching a maximum energy the supply of current to the ignition coil (3) is interrupted. 5. An ignition system for internal combustion engines, with a control unit (1) providing a drive signal, a firing time and an ignition current,an electronic switch (2) for generating a pulse signal,an ignition coil (3) with primary (31) winding and secondary winding (32), wherein said primary winding (31) is connected to a voltage source (4) via the electronic switch (2), and the secondary winding (32) feeds a spark plug (5), anda first current measuring means (61) for determining the primary current flowing through the primary winding (31), to which a comparator (8) is associated downstream for comparison with the target current predetermined by the control unit (1), which is operatively associated with the electronic switch (2) for pulse width and/or frequency modulation of the primary current and thus of the ignition current amplitude,wherein a second current measuring means (62) is provided for determining the flyback current induced in the primary winding (31), and an adder (7) is provided for adding the currents measured with current measuring means (61, 62) to the total current, wherein the total current is applied to the comparator (8). 6. The ignition system according to claim 5, wherein the pulse signal has a fixed or controlled switching frequency of 50 kHz and higher. 7. The ignition system according to claim 5, wherein the pulse signal has a fixed or controlled switching frequency of 50 kHz to 100 kHz. 8. An ignition system for internal combustion engines, with a control unit (1) providing a drive signal, a firing time and an ignition current,an electronic switch (2) for generating a pulse signal,an ignition coil (3) with primary (31) winding and secondary winding (32), wherein said primary winding (31) is connected to a voltage source (4) via the electronic switch (2), and the secondary winding (32) feeds a spark plug (5), and a first current measuring means (61) for determining the primary current flowing through the primary winding (31), to which a comparator (8) is associated downstream for comparison with the target current predetermined by the control unit (1), which is operatively associated with the electronic switch (2) for pulse width and/or frequency modulation of the primary current and thus of the ignition current amplitude,wherein an integrator (9) is provided, which receives the signal of the total current from the adder (7) and is integrated to an ignition energy, whereby upon reaching an energy maximum fed to one of the ignition coils (3), the electronic switch (2) opens. 9. An ignition system for internal combustion engines, with a control unit (1) providing a drive signal, a firing time and an ignition current,an electronic switch (2) for generating a pulse signal,an ignition coil (3) with primary (31) winding and secondary winding (32), wherein said primary winding (31) is connected to a voltage source (4) via the electronic switch (2), and the secondary winding (32) feeds a spark plug (5), and a first current measuring means (61) for determining the primary current flowing through the primary winding (31), to which a comparator (8) is associated downstream for comparison with the target current predetermined by the control unit (1), which is operatively associated with the electronic switch (2) for pulse width and/or frequency modulation of the primary current and thus of the ignition current amplitude,wherein a secondary current correction means (81) is connected on the primary side to the control unit (1) and the comparator (8), wherein the secondary current correction means (81), under control of the control unit (1), provides a ramp-like rising signal during the firing period of the spark plug.