Mitsubishi Eclipse II technical information manual page 203

text version of content this owner's manual page from owners manual to the vehicle Mitsubishi Eclipse, year of production 1995 - 1999:

2-90 POWER TRAIN - Automatic Transaxle Shift Logic Selection 2s 2ND The purpose of the Shift Logic Selection program is to activate I the appropriate “shift logic” so that the “in-gear logic” condition d matches the gear called for by the shift schedule (driver selected gear, throttle position). Imagine that the TCM must always be in one of the logic boxes at any given time. The double line boxes represent the “in-gear logic” the TCM uses to maintain a certain gear range. The single line boxes represent the “shift logic” required by the TCM to execute a desired gear change from one gear to another. The paths (lines with arrows) between the blocks are labeled with one or more of the shift schedule output signals (Is, 2s). 1ST 1s These desired gear signals (shift schedule output signals) be- come the primary input which will cause the correct path to q = In-gear logic be taken, from one in-gear box (such as inl) to a shift logic box (such as l-2). n = Shift logic The output is a change to “shift logic” in order to obtain an in-gear conditon that matches the output of the shift schedule 1 S, 2s = Shift schedule output routine. The TCM knows whether the desired shift has been 1 ST, 2ND = Speed ratio shift completed when a correct speed ratio check of the input and complete signal output speed sensors is present. The speed ratio check is used to verify that the desired gear has been achieved. For example, when the correct speed ratio signal for second gear has been verilied by the TCM by checking the speed ratio between the input and output speed sensors, it will switch to the appropriate in-gear logic (in2). Changes to “In Gear” or “Shift” Logic shift, instead of from an in-gear condition. A “change If the transaxle is in first gear logic (inl) and the mind” condition occurs if a change in the throttle shift schedule output changes to call for second position signal causes the normal shift schedule gear (2s), then “1-2” logic will be activated. This generally remains in effect until the completion ofroutine to select a different desired gear signal, such as is, during a 1-2 shift change. These shifts are the shift is determined by the speed ratio check. accommodated by direct paths between upshift and When the speed ratio check confirms that the de- gired gear (second) has been obtained, ‘in2” logic downshift logic within the logic selection routine. “Change mind” shifts are needed to provide the is activated. There are other possible exits or proper response to changes in driver demand. changes that may be made to the normal shift sched- ule logic from the“1-2” shift logic example, suchChanges in the manual lever (selector lever) position as a change-mind condition. may also cause a “change-mind” shift depending A “change-mind” shift condition may occur whenon when the lever position changes. A more detailed shift logic chart is illustrated. a shift that has begun directly from within another Shift Logic Chart ratio check does not confirm the completion of an Another exit or change to the normal shift schedule ’d logic is the fail shift timer may expire. The TCM attempted shift within this time limit, the shift logic is aborted, and the desired in gear logic is activated. will only allow a certain amount of time to elapse for the shift logic to complete a shift. If a speed

owners manual Mitsubishi Eclipse

owners manual Mitsubishi Eclipse - year of production: 1995, 1996, 1997, 1998, 1999 - Mitsubishi Eclipse II technical information manual EN