Internal-combustion engines – High tension ignition system – Using capacitive storage and discharge for spark energy
Patent
1994-08-01
1995-08-22
Nelli, Raymond A.
Internal-combustion engines
High tension ignition system
Using capacitive storage and discharge for spark energy
F02P 306
Patent
active
054430550
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to ignition systems for internal combustion engines. More specifically, the present invention relates to an ignition system with means for suppressing a transient switch-on condition.
BACKGROUND OF THE INVENTION
Ignition systems, with suppression of a faulty ignition signal after the ignition system has been put into operation, are already known from the German Published Patent Application No. 39 17 808 A1. In this known ignition system, the ignition signal supplied by the control unit is combined with the output signal of a delay circuit which, after the current supply has been switched on, delays the crankshaft angle signal, for example, for a predetermined time so that the trigger signal for the ignition end stage is likewise delayed. The delay takes place by means of an RC element, for example. The realization of the suppression of a switch-on spark is relatively complicated in this case due to the use of a timing element. Finally, no possibility is provided for ensuring that the supply voltage is sufficient for the control unit at the end of the delay period and that, therefore, defined conditions are present at the individual control outputs.
SUMMARY OF THE INVENTION
The arrangement according to the present invention, in contrast to the prior art, has the advantage that immediately after the ignition system has been put into operation, by actuating the ignition switch, for example, each control output of the control unit is immediately drawn to an active low level. It may be regarded as a further advantage that the low level at the output is retained until such time as the supply voltage necessary for the control unit has been built up.
Advantageous further developments and improvements to the ignition system given in the main claim are possible by means of the measures listed in the subclaims. It is particularly advantageous for the switching of the control unit output to earth to take place by means of a voltage-controlled switch so that no additional control current is necessary for this switch. It may be regarded as a further advantage that either each output of the control unit is individually switched to earth by means of a voltage-controlled switch, for example a MOSFET, in order to trigger an ignition end stage or that the outputs of the control unit are respectively lead to a collecting line and are, in this way, switched to earth by means of a MOSFET located in the collecting line. It should finally be mentioned as an advantage that the triggering of the individual MOSFETs takes place as a function of the supply voltage. By this means, for example, the GATE can be lead to the DRAIN input of a further MOSFET connected between the ignition switch outgoing circuit and earth, this MOSFET being controlled as a function of the supply voltage.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a first embodiment of an ignition system in accordance with the present invention.
FIG. 2 shows a second embodiment of an ignition system in accordance with the present invention.
DETAILED DESCRIPTION
In FIG. 1, a terminal 10, for example the ignition switch outgoing circuit of an internal combustion engine, is connected via a resistor 11 to a DRAIN input of a MOSFET 12, which is switched to earth 13 via a SOURCE terminal of the MOSFET. A supply voltage VCC is lead to the control input GATE 14 of the MOSFET 12, two diodes 15 and 16 being connected between the supply voltage VCC and the GATE. A connection 17 leads from the DRAIN input of the MOSFET 12 to GATE connections of further MOSFETs 18.sub.1 to 18.sub.n, where n corresponds to the number of ignition final stages to be activated. Furthermore, a Zener diode 22 is connected to earth 13 in parallel with the MOSFET 12 in order to intercept voltage peaks. The DRAINs of the MOSFETs 18.sub.1 to 18.sub.n are respectively connected to the outputs A1 to An of an integrated driver module 19. The driver module 19 is connected at its terminal 20 to the supply voltage VCC. The driver module 19 is, furtherm
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Gantenbein Reinhard
Schneider Andreas
Nelli Raymond A.
Robert & Bosch GmbH
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