Emulation system for a motor vehicle drivetrain

摘要

An on-line system for emulating the operation of a motor vehicle drivetrain including a torque converter, a converter clutch and a shiftable ratio automatic transmission. Nonlinear differential equations describing the ability of the drivetrain input torque to accelerate the engine inertia and the ability of the drivetrain output torque to overcome the road load and accelerate the vehicle inertia are coupled by a drivetrain model, and periodically integrated forward in real time to provide desired (predicted) engine and vehicle speed values. The predicted engine speed forms the basis for a speed control signal which is applied to an engine dynamometer to load an engine under test as though it were actually installed in a motor vehicle including the modeled drivetrain elements.