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Machine translation
1. (WO1980002861) SPARK AND DWELL IGNITION CONTROL SYSTEM USING DIGITAL CIRCUITRY
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/002861    International Application No.:    PCT/US1980/000703
Publication Date: 24.12.1980 International Filing Date: 02.06.1980
IPC:
F02P 3/045 (2006.01), F02P 5/15 (2006.01)
Applicants:
Inventors:
Priority Data:
49016 15.06.1979 US
Title (EN) SPARK AND DWELL IGNITION CONTROL SYSTEM USING DIGITAL CIRCUITRY
(FR) SYSTEME DE COMMANDE D"ALLUMAGE UTILISANT UN CIRCUIT NUMERIQUE
Abstract: front page image
(EN)Ignition control system (10). Crankshaft advance (15, 16) and reference (17, 18) sensors are utilized to determine positions of maximum and minimum possible spark ignition advance. for each maximum advance pulse (tA) a main counter (41) starts sequentially counting clock pulses (C1) wherein the maximum count obtained by the counter (41) is related to engine crankshaft speed. The count of the main counter (41) is utilized by a dwell circuit (121) to determine the time (tDW) prior to the maximum advance pulse (t-A) at which spark coil excitation should occur. The main counter count also determines several inputs to a read-only-memory (ROM) circuit (48) whose output controls a rate multiplier (53) which receives input clock signals (C2) and provides selective frequency division for these clock signals in accordance with the ROM output. The output of the rate multiplier is coupled to an accumulator means (80, 81, 82) which provides an accumulated count which is utilized to determine spark occurrence. Pulse width modulation circuitry (56) receives an analog signal related to the amount of sensed engine vacuum pressure and produces a corresponding periodic digital two-state signal which has a duty cycle related to the magnitude of the analog vacuum signal. This signal is coupled as an input to the ROM (53) which controls the rate multiplier. In this manner the accumulator count is made to depend upon the magnitude of the analog vacuum signal.
(FR)Un systeme de commande d"allumage (10) est decrit. Des detecteurs d"avance du vilebrequin (15, 16) et des detecteurs de reference (17, 18) sont utilises pour determiner les positions de l"avance a l"allumage par etincelles possible maximum et minimum. Pour chaque impulsion d"avance maximum (tA), un compteur principal (41) commence le comptage sequentiel d"impulsions d"horloge (C1), le comptage maximum obtenu par le compteur (41) etant en rapport avec la vitesse du vilebrequin du moteur. Le comptage du compteur principal (41) est utilise par un circuit (121) pour determiner le temps (tDW) anterieur a l"impulsion d"avance maximum (tA) a laquelle se fait l"excitation de la bobine d"induction. Le comptage du compteur principal determine aussi plusieurs entrees sur un circuit (48) a memoire morte (ROM) dont la sortie commande un multiplicateur (53) qui recoit des signaux d"horloge d"entree (C2) et assure la division selective de frequence de ces signaux d"horloge selon la sortie de la memoire morte (ROM). La sortie du multiplicateur est couplee a un accumulateur (80, 81, 82) qui assure un comptage accumule utilise pour determiner l"existence d"etincelles. Un circuit de modulation de largeur d"impulsion (56) recoit un signal analogique qui est fonction de la pression d"aspiration du moteur detectee et produit un signal numerique periodique correspondant a deux etats qui possedent un cycle de travail qui est fonction de la grandeur du signal analogique d"aspiration. Ce signal est accouple comme entree sur la memoire morte (ROM) (53) qui commande le multiplicateur. De cette maniere le comptage de l"accumulateur se fait en fonction de l"intensite ou grandeur du signal analogique d"aspiration.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)