Optimization for economical cruising strategy of continuously variable transmission vehicle using pseudo-spectral method
XU Shao-bing
LI Sheng-bo
CHENG Bo
Abstract：The fuel consumption of passenger cars not only associates with their fuel-saving performance, but also depends on how they are driven. This paper investigates the economical cruising strategies for vehicles equipped with continuously variable transmission (CVT) and gasoline engine. A fuel optimized control problem is formulated after building models for vehicle longitudinal dynamics and engine fuel consumption. This is a typical singular optimal control problem with a nonstrictly convex cost function, so the Legendre pseudo-spectral method is selected to obtain its optimal solutions. The results show that vehicles should cruise at a constant speed (CS) when the average speed is either low or high; while the‘pulse-and-gliding’(PnG) strategy becomes more economical when the average speed is medium, the maximum fuel saving of PnG is 13%higher than that of the CS strategy. For the PnG strategy, the fuel-saving mechanism and the relationship between fuel economy and driving comfort are also explained.
Keywords：ECO-drivingcruisepseudo-spectral methodoptimal control
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 693-700 )