Electricity: electrical systems and devices – Electrical speed signal processing systems
Patent
1979-08-15
1981-05-19
Miller, J. D.
Electricity: electrical systems and devices
Electrical speed signal processing systems
361239, 123414, 123418, F02B 502
Patent
active
042688884
ABSTRACT:
In order to prevent ignition power losses at low engine speeds and further to provide for the use of ignition control signals of both unipolar and bipolar nature, the invention provides that a Schmitt trigger which generates the principal ignition control signal is actuated by the transducer. The switching thresholds of this Schmitt trigger are changeable by a secondary threshold recognition circuit which can shift at least the negative threshold of the principal threshold circuit to more positive values. The invention also includes a delay circuit which prevents the return of the shifted threshold to more negative values. Still further included is a third threshold circuit which is engaged only at some higher engine speed.
REFERENCES:
patent: 4063539 (1977-12-01), Gorille et al.
patent: 4095576 (1978-06-01), Hattori et al.
patent: 4138982 (1979-02-01), Hattori et al.
patent: 4164926 (1979-08-01), Kindlman
patent: 4174697 (1979-11-01), Podrapsky et al.
patent: 4178892 (1979-12-01), Podrapsky et al.
patent: 4188929 (1980-02-01), Podrapsky et al.
patent: 4201163 (1980-05-01), Hattori et al.
Bodig Bernd
Jundt Werner
Miller J. D.
Robert & Bosch GmbH
Schroeder L. C.
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