Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1981-02-18
1983-04-05
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
123417, 123418, 123421, 123599, F02P 100, F02P 302, F02P 504
Patent
active
043787690
ABSTRACT:
In an ignition system for an internal combustion engine, a digital system for computing the timing advance is provided. Constants approximating the curve of timing advance v. engine speed are stored in a microprocessor. The positive half waves of primary current in the magneto generate the ignition energy and also generate a reference signal for controlling the actual ignition time. The sequence of reference signals is also used to generate a digital value indicative of engine speed. The latter is used to address the read only memory in which the constants for approximating the timing advance curve are stored. After each reference signal, the value read out from the read only memory is counted down by a counter. When the counter reaches the value of zero, ignition is started.
REFERENCES:
patent: 3923021 (1975-12-01), Stark
patent: 4009669 (1977-03-01), Hetzlar et al.
patent: 4231332 (1980-11-01), Wrathall
patent: 4244023 (1981-01-01), Johnson
patent: 4244339 (1981-01-01), Gorille
patent: 4262644 (1981-04-01), Walker et al.
patent: 4267810 (1981-05-01), Wesenmeyer et al.
Haubner Georg
Meier Werner
Schrumpf Hans
Wesemeyer Jurgen
Nelli Raymond A.
Robert & Bosch GmbH
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