Electronic ignition control apparatus

43 Pages·2013·3.69 MB·English

Unlted States Patent [19] [11] Patent Number: 4,499,544
Ohba et al. [45] Date of Patent: * Feb. 12, 1985
[54] ELECTRONIC IGNITION CONTROL 4,258,683 3/1981 Hattori et al. .................... .. 123/416
APPARATUS 4,273,089 6/1981 Maier .................. .. 123/417
_ 4,276,601 6/1981 Tokuda et al. ...... .. 364/43l.04
[75] Inventors: Masahiro Ohba, Toyohash1; Kenzo 4,284,045 8/1981 Maier . . . . . . . . . . . . . . . . . . .. 123/416
Ito, Okazaki; Susumu Akiyama, 4,298,941 11/1981 Furuhashi .... .. 364/431.04
Kariya; Yuuji Hirabayashi, Aichi; 4,303,977 12/ 1981 Kobashi et al. 364/431.04
Satoshi Hiram)’ Kariya; Naoto Ooka’ 4,304,203 12/ 1981 Garcea et a1 ..... .. 123/416
~ 4,309,973 l/l982 Tamura . . . . . . . . . . . . . . . .. 123/609
_ Gamagon’ an of Japan _ 4,347,570 8/1982 Akiyama et al. ............. .. 364/431.04
[73] Ass1gnee: Nippondenso C0., Ltd., Kariya, Japan Primary Examiner_FeliX D- Gmber
[ * ] Notice: The portion of the term of this patent Attorney, Agent, or Firm—Cushman, Darby & Cushman
subsequent to Nov. 23, 1999 has been
disclaimed. [57] ABSTRACT
_ In an electronic ignition control apparatus having RAM
[21] Appl' No" “L362 to initially store ?rst and second signals indicative of the
[22] Filed: Aug. 25, 1982 starting and terminating points for calculation of a time
necessary for rotation of a predetermined angle de?ned
Related Us. Application Data by integer times as large as a predetermined angular
, _ interval of an output shaft of an engine, a rotation time
[63] gonzlgugg'gaof Ser' No‘ 199’234’ Oct‘ 21’ 1980’ Pat‘ of the output shaft is calculated during rotation of an
0' ’ ’ ' angle of the output shaft de?ned by the ?rst and second
[30] Foreign Application Priority Data signals from RAM to calculate an optimum spark ad
Oct 22 1979 [JP] Japan 5 4_1 3621 6 vance angle in relation to the operating condition of the
' ’ """""""""""""""" " engine such that an angular position de?ned by integer
[51] Int. (11.3 ......................... .. FOZP 5/ 04; FOZP 3/ 02; times as large as the predetermined angular interval at
G053 15/ 02 the advance angle side of the calculated advance angle
[52] US. Cl. ............................. .. 364/431.04; 123/417; is determined to be stored in RAM as a third signal,
123/ 610; 123/ 613; 364/43l.l2 Calculation of a time de?ned by the difference between
[58] Field of Search ------------- -‘ 123/416, 417, 418, 609; the calculated advance angle and the angular position
364/431-04 de?ned by the third signal is started upon arrival of the
6 R f C-t output shaft to the angular position de?ned by the th1rd
[5 1 e erences 1 ed signal from RAM and completed to deenergize the
US- PATENT DOCUMENTS ignition coil of the engine previously energized.
4,207,847 6/1980 Hattori et al. .................... .. 123/418
4,225,925 9/1980 Hattori et a1. .................... .. 123/416 8 Claims, 20 Drawing Figures
PULSE SIGNAL CRANK-ANGLE 1 ST ADDRESS
GENERATOR COUNT CIRCUIT
SIGNAL 7ST DMA
GENERATOR REQUEST ancun 2 ND 9”‘
REQUEST
CIRCUIT
2 NO ADDRESS
LATCH CIRCUIT CONTROL PLA CIRCUIT SIGNAL
COUNTER
3 I;
PULSE SIGNAL OUTPUT SIGNAL
CONTROL CIRCUIT
GE NERA TOR
r
fa 340 I?
SIGNAL IST COUNT 2 ND COUNT 3RD COUNT
CIR CUI T CIRCUIT CIRCUI T CIRCUIT
U.S. Patent Feb. 12,1985 Sheet 1 of15 4,499,544
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US. Patent Feb. 12,1985 Sheet3 ofl5 4,499,544
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’U.S. Patent Feb. 12,1985 Sheet6ovfl5 4,499,544
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US. Patent Feb. 12,1985 Sheet8of15 4,499,544
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