The functionality of the I-shift gearbox depends on the installed software functions. There are three types of software functions: - Standard functions - Package functions - Optional functions Standard functions are always available. Package functions are included in the different dif ferent software packages. Every software package includes a number of different software functions. Optional functions can be added to the different packages to allow for f or specialized functionality.
The following functions are the standard functions, they are always included with the I-shift "C"-generation. - Performance shift - Basic shift strategy - Basic gear shift adjustments - Oil temperature - Basic PTO - E/P modes
The gearchanges are optimized regardless of the external conditions (for example road inclination (gradient), oil temperature and gear ratio. This is done through use of the engine’s compression brake (EPG/VEB), the clutch and the countershaft brake. The result is increased comfort and minimized shift times.
Standard functions - Basic shift strategy A start gear from 1:st to 6:th gear will be automatically selected. The actual selection is done depending on the vehicle weight (only with ECS) and road inclination incl ination (gradient). There is also a trailer connector detection function in the LCM which adjusts the starting gear when connecting and disconnecting a trailer.
Standard functions - Basic gear shift adjustments When engine braking while driving in automatic mode it is possible to adjust the automatically selected driving gear using the shift buttons on the shift lever. Arrows in the display indicate available up/down gears.
Standard functions - Gearbox oil temperature monitor This function has the following features: - the gearbox oil temperature will be shown in the dashboard display - a gearbox oil temperature warning system will inform the driver when the gearbox oil temperature is too high Current warning levels Yellow warning light: Gearbox oil temperature >100° C for more m ore than 300 minutes Gearbox oil temperature >120° C for more m ore than 30 minutes Red warning light: Gearbox oil temperature >140° C for more m ore than 1 minute
It is possible to define which splitter gear that is selected when transmission PTO is used. Using high or low splitter gear when running the PTO will result in different PTO speeds.
Standard functions – Economy/Performance Modes This function adds the possibility to select between Economy and Performance modes. m odes. The modes are selected with the E/P-button on the gear selector. The mode currently active is shown in the display. Economy The strategy here is be to keep the engine revs inside the green field f ield of the rev-counter to get as good fuel economy as possible. Performance Here the engine revs are allowed to go above the green field so that the engines maximum power can be used. The available rpm-range is still wide enough to allow the gearbox to skip gears when possible. Performance mode is automatically switched off after a couple of minutes if the driver does not use the high engine speeds.
Software packages - General information The different software packages each contain a selection of functions that suits different truck uses. Basic (TP-BAS) Gives the transmission its basic functions and is supplied as standard with I-shift. Distribution and Construction (TP-DICON) Modifies the transmission’s operation for distribution and construction operation. Includes, among other things, functions that aid maneuverability when starting from standstill and in close-quarter maneuvering. More text to this picture on next page. _ Long Haul, Fuel & Economy (TP-FUEC) Contains functions that minimize fuel consumption. This program package is particularly suitable for long-haul operations.
Heavy Duty GCM Control (TP-HD) Optimizes I-shift for heavy gross combination weights (>60 ton). One program package can be replaced with another package using VCADS-Pro.
Software packages - Identification There are four different versions of software packages available. Variant name - Software package name TP-BAS - Basic TP-DICON - Distribution and Construction TP-FUEC - Long Haul, Fuel & Economy TP-HD - Heavy Duty GCM Control Package identification When the gear lever is folded forward the display will show which software package that is installed in a truck. Display identification - Software package B - Basic DC - Distribution and Construction FE - Long Haul, Fuel & Economy HD - Heavy Duty GCM Control
Package functions - Eco Roll Eco Roll is a system designed to minimize the trucks rolling resistance when no engine power is needed. Minimizing the rolling resistance will allow the truck to roll as far as possible before the engine is needed again. When Eco Roll is engaged the split gear is set to neutral position. This means that the engine is disconnected from the gearbox. The engine is then allowed to idle during the time when Eco Roll is engaged. The function gives best results in slightly hilly conditions. More text to this picture on next page. _ Eco Roll is engaged when the following six conditions are met: - gear selector is in “A” (Automatic) position - auxiliary brake stalk is in “A” (Automatic) position - accelerator pedal is released - brake pedal is not pressed - downhill not steeper than 5% - truck speed not too high (corresponding to 1800 rpm in top gear)
If any one, or more, of the six conditions are not met Eco Roll is disengaged. Eco Roll can also be used when cruise control is activated. If, for any reason, the engine stops running while the Eco Roll function f unction is used the Eco Roll function is automatically disengaged and the gearbox reconnected to the engine. This will ensure that the servo assisted steering will be working.
Package functions - Smart Cruise Control Normal cruise control have a function that engages the auxiliary brakes (VEB and EPG) if the set cruise control speed is exceeded by more than a set limit. This limit can be adjusted by the driver. Smart Cruise Control will enable a function that limits the auxiliary brakes even though the vehicle speed is above the brake cruise set speed when the road conditions are such that the vehicle still will decelerate with reduced auxiliary brake power. When possible the Eco Roll is also activated. More text to this picture on next page. _ Smart Cruise Control is engaged when the following four conditions are met: - cruise control is activated - gear selector is in “A” (Automatic) position - auxiliary brake stalk is in “A” (Automatic) position - accelerator pedal is released - the offset speed for brake cruise is set to more than 5 km/h - no engine PTO:s are activated
Package functions – Launch Control* This function adds the following features: - will enable a function that allows clutch control at low vehicle speeds by use of the brake pedal (see picture, the clutch is engaged by the accelerator pedal and disengaged by the brake pedal) - will make it possible to run the vehicle at engine idle speed without slipping the clutch - will control engine torque when driving in start gear in order to optimize gear shifting performance and avoid running in high engine revs. More text to this picture on next page. _ The following functions requires that the EBS allows XBR (external brake request) from the TECU. - will automatically activate service brakes to stop the vehicle during start of vehicle when rolling in wrong direction This feature requires Electronic Brake System (ABS-EBS) . - will automatically activate service brakes to stop the vehicle in order to change gear during vehicle speed direction change. This feature requires Electronic Brake System (ABS-EBS). - when Hill Start Aid is enabled a Smart Hill Start Aid function will automatically activate a delayed brake release when the vehicle is in a uphill slope but not when the it is in a down hill slope. This feature requires the medium or high Electronic Brake System package (EBS-MED or EBS-HIG).
Package functions – Enhanced Shift Strategy* This function adds the following features compared with the basic shift strategy: - improvement of the engine brake performance by continuously selecting gears that runs the engine at high revs. When a compact retarder is installed, the cooling performance is increased and accordingly the retarder braking performance. - when driver activates manual control on the air suspension control box, the lowest possible gear will automatically be selected to get the best possible control of the vehicle when driving slowly. This feature requires Electronically Controlled Suspension levelling (ECS). The following function requires that the EBS allows XBR (external brake request) from the TECU. - the service brakes are applied momentarily during gear shifts when engine braking to compensate for the interruption of engine brake torque. This maximizes the engine braking performance at the same time as giving an excellent comfort. This feature requires Electronic Brake System (ABS-EBS) on the vehicle. This function will also be disabled if a trailer without ABS is connected to the vehicle. * Full functionality requires EBS-MED/EBS-HIG.
Package functions – Heavy Duty GMC Control This function adds features to better control high GMC weights (60-180 ton). The function adapts the gear selections, clutch and shift operations for higher GMC. The function is possible to use with the following variants: - MD16 (ATO3112C) - MD13, 480hp and 520hp (AT2512C and ATO2512C) Note that there are also other restrictions that apply when this function is used, for example topology restrictions.
Optional functions The following optional functions f unctions can be combined with the software packages. - Gear selections in auto - Enhanced PTO functions
Optional Functions – Gear selections in auto ”1” This function adds the following features when using “A” (Automatic) mode: Starting gear It is possible to manually adjust the automatically selected starting gear in automatic mode by activating the shift button on the shift lever. Arrows in the display indicate available gears. Driving gear it is possible to manually adjust the automatically selected driving gear in automatic mode by activating the shift button on the shift lever. Arrows in the display indicate available gears.
Optional Functions – Gear selections in auto ”2” This function adds the following features when using “A” (Automatic) mode: Kick-down The kick-down function will change the gear-shifting strategy. The picture shows the three different driving modes that the driver can select. - Economy The strategy here is be to keep the engine revs inside the green field f ield of the rev-counter to get as good fuel economy as possible. - Performance Here the engine revs are allowed to go above the green field so that the engines maximum power can be used. The available rpm-range is still wide enough to allow the gearbox to skip gears when possible. Performance mode is automatically switched off after a couple of minutes if the driver does not use the high engine speeds. - Kick-down During kick-down the engine revs are allowed to go above the green field fiel d so that the engines maximum power can be used. The gearbox will also try to keep the engine revs high by not using gear-skipping. Variant name for “Gear Selections in Auto”:
Optional functions - Enhanced PTO Functions This option makes it possible to activate the Power Take Off features described below by setting software parameters in VCADS-pro. All of the below functions require that a BBM module is installed in the vehicle (variants ELCE-CK or SPEED-DU) This option adds the following features: Gear selection restricted by engine speed limits It is possible to set software parameters that will limit the engine speed when engine or transmission PTO:s are used. This feature will adapt the gear selection strategy to these speed limitations. More text to this picture on next page. _ Auto Neutral The driveline will be disengaged on request from the BBM (Body Builder Module) regardless of the gear lever position when the “Auto Neutral” function is active.
Reverse Inhibit When the BBM requests “reverse inhibit”, the reverse gears is blocked by the transmission system. Split box engagement It is possible to engage a split box for running high capacity PTO:s. The direct gear is engaged when the Body Builder Module request that the split box is engaged.
Functions in software packages The picture shows the functions included in the different software packages. Possible software combinations The picture shows an overview over the possible combinations of ”standard”, ”package” and ”extra” functions.
