Patent ID: 6379282
Filing Date: 2002-04-30
Classification: B60K,B60W,F16H,Y02T,Y10S,Y10T

Abstract:
A control system for a power transmission used for driving a vehicle, said power transmission including an engine and a continuously variable transmission which conveys a driving force with a speed change from said engine to wheels of said vehicle, said control system comprising;idling elimination control means which stops said engine when said vehicle is brought into a halt; and speed change control means which calculates a target engine rotational speed in consideration of a driving condition of said vehicle and varies a speed change ratio of said continuously variable transmission such that a rotational speed of said engine follows said target engine rotational speed, wherein, while said vehicle is being decelerated with a throttle provided in said engine being closed, said control system, while terminating fuel supply to said engine, directs said speed change control means to vary said speed change ratio to a substantially LOW ratio such that said speed change control means makes said rotational speed of said engine follow said target engine rotational speed at a control speed which is faster than a control speed applied when said throttle is open, said control speed being defined as the speed at which said speed change ratio is being varied and wherein said speed change control means controls speed change operation of said continuously variable transmission by a control value which includes an integral term, said integral term being determined as a cumulative sum of a deviation of said rotational speed of said engine from said target engine rotational speed.