Engine control with fixed point digital overflow prevention

Details Engine control with fixed point digital overflow prevention Engine control with fixed point digital overflow prevention

1991-12-18

1993-12-21

Malzahn, David H.

Boots, shoes, and leggings

36443104, G06F 738

Patent

active

052726592

ABSTRACT:
A real time electronic engine control system is disclosed and includes a method of an apparatus for preventing overflow during a fixed point arithmetic operation. Each of two input numbers is divided by the same fixed number to obtain quotients of the input numbers and the arithmetic operation is then performed on the quotients of the input numbers to obtain a resultant number. The resultant number r from the arithmetic operation is compared to maximum (p) and minimum (q) register overflow values and the value of r is selected if p>r>q, while the value p is selected if r.gtoreq.p, and q is selected if r.ltoreq.q. Finally, the selected one of the compared numbers is multiplied by the fixed number to provide the result of the computation.

REFERENCES:
patent: 4379338 (1983-04-01), Nishitani et al.
patent: 4592008 (1986-05-01), Nopper
patent: 4700324 (1987-10-01), Doi et al.
patent: 4819198 (1989-04-01), Noll et al.
patent: 4941119 (1990-07-01), Moline
Drumm, "Saturation Adder Solves Overflow Problems in 2nd-Order Filters" Electronic Design vol. 28, No. 18 Sep. 1, 1980 pp. 167-168.

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