Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1974-01-16
1977-05-03
Husar, C. J.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
123148E, F02P 100
Patent
active
040208079
ABSTRACT:
In order to vary the timing of the ignition of an air/fuel mixture in a cylinder of an internal-combustion engine as a function of engine speed, a flip-flop is set by an engine-controlled switch at a predetermined point t.sub.0 in the cycle, in a position preceding by an angle .alpha..sub.0 the upper-dead-center position of an associated piston, to effect a rapid discharge and to start a slow recharge, at constant rate, of a capacitor C.sub.1 forming part of a time/voltage converter. The maximum voltage attained by this capacitor at the end of a cycle, as a measure of cycle length T, is registered in an ancillary capacitor C.sub.3 as another capacitor C.sub.2, forming part of a voltage/time converter, also begins charging at time t.sub.0 at a rate making the charges of capacitors C.sub.2 and C.sub.3 equal on or before the attainment of the UDC position. This equality is detected by a comparator which thereupon, at a time t.sub.0 +t.sub..gamma., resets the flip-flop to trigger an igniter for the associated cylinder. The charging rate of capacitor C.sub.2 may be modified by one or more sensing circuits responsive to external parameters and/or by one or more threshold circuits upon the charge of capacitor C.sub.1 or C.sub.2 reaching a predetermined level. Capacitors C.sub.2 and C.sub.3 are discharged upon the resetting of the flip-flop, the recharging of capacitor C.sub.3 beginning shortly thereafter.
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Costa Mario
Del Zotto Giorgio
Devinsky Paul
Dubno Herbert
Husar C. J.
Ross Karl F.
SGS-ATES Componenti Elettronici SpA
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