초록 ▼

A system for controlling a vehicle drivetrain in a fuel-efficient manner includes, in one embodiment, a control computer operable to determine a number of engine load/engine speed boundary conditions as functions of brake specific fuel consumption (BSFC) contours in relation to an engine output char

A system for controlling a vehicle drivetrain in a fuel-efficient manner includes, in one embodiment, a control computer operable to determine a number of engine load/engine speed boundary conditions as functions of brake specific fuel consumption (BSFC) contours in relation to an engine output characteristics map and define therefrom an undesirable engine operation region U. As long as the engine is engaged with at least one of the gear ratios of the vehicle transmission, the control computer is operable to maintain or encourage engine operation outside of the region U. In another embodiment, the control computer is operable to define a contour from substantially zero engine load to substantially full engine load, wherein the contour preferably corresponds to a fuel-efficient path from no-load to full-load engine operating conditions.

대표청구항 ▼

1. A system for controlling a vehicle drivetrain, comprising:a memory having stored therein an engine output characteristics map for an internal combustion engine and a number of fuel consumption contours associated with said map; and means for establishing a region of said engine output characteris

1. A system for controlling a vehicle drivetrain, comprising:a memory having stored therein an engine output characteristics map for an internal combustion engine and a number of fuel consumption contours associated with said map; and means for establishing a region of said engine output characteristics map wherein engine operation is undesirable, said region defining a first border as a function of at least one of said fuel consumption contours and a second border intersecting said first border.