Kimberly S Scott

US Patent:

50580213, Oct 15, 1991

Filed:

Feb 22, 1990

Appl. No.:

7/484049

Inventors:

Kimberly Scott - Toledo OH

Assignee:

Prestolite Electric Incorporated - Toledo OH

International Classification:

F02P 500
F02P 900
G06F 1548
G06G 770

US Classification:

36443104

Abstract:

A distributorless ignition system is shown having a timing controller that is responsive to one cylinder of the engine reaching top dead center for predicting the times at which one or more subsequent cylinders in the firing order should enter dwell and fire based upon the current engine speed, current battery voltage and the time interval between one cylinder reaching top dead center and the preceding cylinder reaching top dead center. At low operating speeds the controller plans for the firing of a cylinder utilizing triple precision calculations. At midrange speeds and high speeds, however, the controller utilizes double precision calculatons. At very high speeds, the controller of the present invention plans the firing of two or more cylinders at the same time forcing the cylinders into overlapping dwell. Knock is reduced while optimizing the amount of power obtained from each cylinder by utilizing various knock algorithms depending upon the current speed of the engine when the potential knock is detected.