The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 22, 1976
Filed:
Jun. 07, 1973
Thomas William Hartford, Livonia, MI (US);
The Bendix Corporation, Southfield, MI (US);
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.