Patent ID: 6616575
Filing Date: 2003-09-09
Classification: B60W,F16H,Y02T,Y10T

Abstract:
A drive line assembly for a work machine comprising:an engine driving an engine output shaft; an engine speed sensor which generates engine speed signals indicative of a speed of said engine output shaft; a fuel injector operable to regulate fuel flow to said engine; a transmission driven by said engine output shaft and having a number of gear ratios; and a controller operable to (i) store a predetermined maximum efficiency curve of engine speed versus torque output, wherein said predetermined maximum efficiency curve is derived from specific fuel consumption data for said engine, (ii) determine said engine speed from said engine speed signals, (iii) limit said fuel flow said fuel injector supplies to said engine to cause said engine to operate along said predetermined maximum efficiency curve for said engine speed, (iv) control shift points between said number of gear ratios based on said predetermined maximum efficiency curve, (v) store a primary upshift point and a secondary upshift point between said number of gear ratios based on said predetermined maximum efficiency curve, and (vi) determine a transmission speed, wherein said primary upshift point occurs at a higher transmission speed than said secondary upshift point.