Similar modeling and control system design principles were then can applied for design of a number of ECTs. mation This additional work revealed the impor- tance of comprehensive and detailed power train system models, and appropriate digital signal processing that should parallel and complement the control work. The modeling also contributed to better understanding of the new hardware, in particular, the elec- trohydraulic actuators. This led to modifi-
cations that improved the control function.
Present and future efforts in the power-
train control area are directed toward in-
creased application of coordinated control
between the engine, transmission, and the overall vehicle system. This will intensify
the need for efficient and comprehensive ve-
hicle system models. A strong and mature
modeling base should ultimately facilitate full utilization of modem, linear, and non- linear control methodologies.