Digital ignition spark timing angle control with read only memor

Details Digital ignition spark timing angle control with read only memor Digital ignition spark timing angle control with read only memor

1976-01-19

1977-03-01

Husar, C. J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123 32EB, 1231465A, F02P 100

Patent

active

040096998

ABSTRACT:
A read only memory is pre-programmed to produce an output binary signal representation of a predetermined ignition spark timing angle based upon the instantaneous value of both of two selected engine operating parameters at each of a plurality of respective selected points within the range of values in response to respective input address signals. Over the range of values of the two selected engine operating parameters, therefore, the read only memory generates a three-dimensional surface of ignition spark timing angles. The binary signal representations of the ignition spark timing angles retrieved from the read only memory are varied in accordance with engine manifold vacuum and actual atmospheric pressure to tilt the three-dimensional surface generated by the read only memory about a selected engine parameter value as an axis in an amount substantially inversely proportional to actual atmospheric pressure.

REFERENCES:
patent: 3483364 (1969-12-01), Leeson
patent: 3738339 (1973-06-01), Huntzinger et al.
patent: 3749073 (1973-07-01), Asplund
patent: 3835819 (1974-09-01), Anderson
patent: 3903857 (1975-09-01), Honig et al.
patent: 3927648 (1975-12-01), Kawai et al.
patent: 3942491 (1976-03-01), Seite et al.

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