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Commit 0a954c0c authored by Markus Quaritsch's avatar Markus Quaritsch
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more work on user manual

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###Engine Torque and Engine Speed Limitations
##Gear Shift Model (MT, AMT)
##Gear Shift Model
The Gear Shift Model is based on shift curves that define the engine speed for up- and down- shifting as a function of engine torque. As soon as the engine operation point passes one of the shift curves a gear change is initiated.
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##Gear Shift Rules for AMT Gearbox
###Computation of Shift Polygons in Declaration Mode (According to ACEA Whitebook 2016)
####1. Computation of Characteristic Points
![](pics/shiftlines_1.PNG)
####2. Definition of Shift Lines
![](pics/shiftlines_2.PNG)
####3. Exception 1: Margin to Max-Torque line (Downshift)
![](pics/shiftlines_3.PNG)
Note: Line L1 is shiftet parallel so that it satisfies the max-torque margin condition, not intersected.
####4. Exception 2: Minimal Distance between Downshift and Upshift Lines
![](pics/shiftlines_4.PNG)
####5. Final Gearshift Lines (Example)
![](pics/shiftlines_5.PNG)
If the gearbox defines a maximum input speed for certain gears the upshift line may further be intersected
and limited to the gear's maximum input speed.
###Upshift rules
* If the engine speed is higher than the gearbox maximum input speed or engine n_{95h} speed (whichever is lower)
* If all of the following conditions are met:
- The vehicle is not decelerating
- Engine operation point (speed and torque) is above (right of) the upshift line AND
- The acceleration in the next gear is above a certain threshold if the driver is accelerating, i.e., acceleration_nextGear > min(Min. acceleration threshold, Driver acceleration) AND
- The last gearshift was longer than a certain threshold (Declaration Mode: 2s) ago AND
- The last downshift was longer than a certain threshold (Declaration Mode: 10s) ago
###Downshift
* If the engine speed is lower than the engine's idle speed
* If all of the following conditions are met:
- Engine operation point (speed and torque) is below (left of) the downshift line AND
- The last gearshift was longer than a certain threshold (Declaration Mode: 2s) ago AND
- The last upshift was longer than a certain threshold (Declaration Mode: 10s) ago
###Shift parameters
- Gearshift lines
- Engine idle speed
- Gearbox max. input speed
- Engien n_{95h} speed
- Min. time between two consecutive gearshifts.
- Min. time for upshift after a downshift
- Min. time for downshift after an upshift
- Min. acceleration in next gear
##Gear shift rules for AT Gearbox
##Gear Shift Rules for AT Gearbox
The gear shift rules for automatic gearboxes differ from AMT and MT.
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......@@ -12,6 +12,7 @@ In this chapter the used component models for the simulation are described.
* [Engine: Fuel Consumption Calculation](#fuel-consumption-calculation)
* [Engine: Transient Full Load](#transient-full-load)
* [Engine: WHTC Correction](#transient-full-load)
* [Engine Torque and Engine Speed Limitations](#engine-torque-and-engine-speed-limitations)
* [Gear Shift Model](#gear-shift-model)
* [Torque Converter Model](#torque-converter-model)
* [Auxiliaries](#auxiliaries)
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......@@ -31,6 +31,7 @@
3-simulation-models/Transmission_Losses.md
3-simulation-models/Gearbox_AT.md
3-simulation-models/GearShift.md
3-simulation-models/Gearshift_AMT.md
3-simulation-models/Gearshift_AT.md
3-simulation-models/Engine_Speed_Torque_limitations.md
3-simulation-models/TC.md
......
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