초록 ▼

A multi-speed transmission control has a CPU which utilizes a pre-programmed computer to control the interchange of the friction devices in the transmission. A routine within the CPU is executed by the computer at least when an impending ratio interchange is sensed. The routine uses stored data whic

A multi-speed transmission control has a CPU which utilizes a pre-programmed computer to control the interchange of the friction devices in the transmission. A routine within the CPU is executed by the computer at least when an impending ratio interchange is sensed. The routine uses stored data which includes friction disc parameters, engine operating parameters and vehicle performance parameters to determine if the impending shift will result in sufficient excess heat energy to cause the temperature of components in the friction device to exceed a predetermined design limit. If the temperature design limit will be exceeded, a reduced energy ratio interchange is commanded utilizing adaptive parameters for the upcoming shift; and if the temperature design limit will not be exceeded, the ratio interchange proceeds without adaptive parameters.

대표청구항 ▼

[ What is claimed is:] [3.] A control for an engine driven multi-speed transmission having a plurality of friction devices which are selectively interchanged to complete a transmission ratio shift and during which shift heat energy is transmitted through an oncoming friction device, said control com

[ What is claimed is:] [3.] A control for an engine driven multi-speed transmission having a plurality of friction devices which are selectively interchanged to complete a transmission ratio shift and during which shift heat energy is transmitted through an oncoming friction device, said control comprising:means for storing a plurality of parameters of an engine and the transmission and for determining an impending ratio interchange said transmission parameters including friction plate diameter and thickness and a heat sink capacity for each friction device;means for determining a heat energy amount which will be absorbed by the friction device during the impending ratio interchange;means using at least said heat sink capacity and said friction plate diameter and thickness for determining if said heat energy amount will cause a temperature in a heat sink of the oncoming friction device to exceed a predetermined value;means for determining adaptive values for the transmission parameters; andmeans for instructing a portion of the transmission parameters to utilize said adaptive values during the impending ratio interchange when it is determined that the temperature of the heat sink of the oncoming friction device will exceed the predetermined value.