Digital engine control system using DDA schedule generators

Details Digital engine control system using DDA schedule generators Digital engine control system using DDA schedule generators

1973-06-07

1976-06-22

Myhre, Charles J.

Internal-combustion engines

Noncompression

23515121, 235197, F02B 300, F02D 1910

Patent

active

039644430

ABSTRACT:
A first pair of DDAs for interpolating along a predetermined MAP-RPM-Fuel schedule for an internal combustion engine and a second pair for iterpolating along a predetermined MAP-TEMP-ENRICH schedule. Each DDA interpolates along a predetermind specific schedule for a number of iterations directly proportional to the magnitude of one of the engine dependent parameters comprising the schedule without necessitating any intervening conversion into or out of a binary number. The first DDA of each pair using slope and intersection data from a small memory interpolates linearly along at least two contiguous segments and feeds the second DDA which by feeding different register stages to different adders interpolates nonlinearly to effect a predetermined logarithmic relationship. The outputs of the two pairs are summed and then suitably clocked to selectively gate different fuel injectors.

REFERENCES:
patent: 2841328 (1958-07-01), Steele
patent: 3426184 (1969-06-01), Riseman
patent: 3483364 (1969-12-01), Leeson
patent: 3582622 (1971-06-01), Okupa
patent: 3674999 (1972-07-01), Kelling
patent: 3676655 (1972-07-01), Ancona
patent: 3689753 (1972-09-01), Williams
patent: 3701890 (1972-10-01), Dummermuth
patent: 3793882 (1974-02-01), Holben
patent: 3831563 (1974-08-01), Brittain
patent: 3835819 (1974-09-01), Anderson
"Electronic Fuel Injection", Electronics Magazine, Sept. 11, 1972, pp. 121-225.

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