NOTE: IPM is only available for Tier 3/Stage IIIA, Interim Tier 4/Stage IIIB, Final Tier 4/Stage IV engines, and not for Stage II engines.
This feature is for many typical farming operations that use the rear power take-off (PTO) in high-power applications or the tractor as a transport vehicle. Operators who are looking for more power in non-stationary PTO and transport applications will be interested in the IPM feature.
In high rear PTO power applications such as forage harvesters, rototillers, and beet or potato harvesting equipment or where heavy trailers, carts, or implements are moved to and from various locations, this feature provides significant additional capabilities. The solution improves productivity with more consistent ground speeds, quicker acceleration, and the ability to better hold desired transport speeds.
This two-in-one tractor solution successfully operates in power-intensive PTO and transport applications at reasonable low fuel consumption without being disadvantaged by the higher weight, the bigger proportions, and the extra costs of the next higher horsepower model.
This feature is available as a factory- or field-installed option.
8R Tractor in transport
Rear PTO field applications
- Rear-mounted snow blowers
- Sugar beet harvesting
- Forage harvesters
- Potato harvesting
- Rotary cutters
- Mower conditioners
- Flail mowers
- Soil stabilizing
- Power harrow
- Vegetable bed formers
- Muck spreaders
- Grain carts or wagons
- Slurry tanks
- Implement transport from field to field
- Pull-type sprayers
- Extensive operation in hills/roadways
This is not intended to be an inclusive list of all applications but shows the wide range of uses for additional engine horsepower.
IPM provides engine power increase in levels proportional to the size of the tractor. IPM provides a controlled power boost of up to 26 kW (35 engine hp) to tractor under the following operating conditions:
- Tractor moving and PTO under load
- Transport during acceleration
- Transport during deceleration
Power increase is not provided under draft applications or non-loaded rear PTO applications. Power increase is only provided when required.
How it works
There are specific operating parameters when IPM functions to boost engine power. It is the "intelligent" part of the system that provides seamless operation while adjusting the engine horsepower depending on how the tractor is being used. For engine horsepower boost activation, the tractor must already be running an application that is using the full power capability of the tractor.
Power must be sensed going through the PTO drive clutch by the tractor's electronic systems. The tractor must be moving at least 0.5 km/h (0.3 mph) and PTO consuming moderate power before power boost engages. The speeds shown above, assume lowest possible gear or speed setting and the engine running at 2100 rpm.
NOTE: If the tractor is equipped with a front PTO, additional IPM power will transfer through the front PTO. However, IPM activation is only sensed through the rear PTO. Adequate load must be sensed on the rear PTO in order for IPM to activate.
When in transport applications, power transition is smooth. The engine will respond seamlessly as load changes, such as when going up and down hills. Additional power is available at a useful working speed with minor differences between tractor models and transmissions.
The minimum ground speed is where additional power will begin to be applied, assuming the engine is already fully loaded. Ramp up to full additional power occurs as speed continues to increase. Full additional power occurs within a 3 mph (5 km/h) band.
Transport during acceleration: power boost occurs in steps through the range from 23 km/h – 28 km/h (14.3 mph – 17.4 mph).
Transport during deceleration: power boost ramps down in equal steps in the range from 23 km/h – 18 km/h (14.3 mph – 11.2 mph).
Power boost levels other than at rated rpm
Some operators will run the tractor at full loads and/or run transmissions in auto mode in transport. This means that the engine most likely will not be operating at rated rpm. As the engine is loaded, it will eventually drop off of rated rpm and use the power bulge as rpm slows. This is the way every John Deere PowerTech™ Plus engine operates when it is loaded to maximum power and torque.
Usable rpm range of operation (8345R shown)
IPM (shown in purple in chart above versus standard power shown in blue) provides additional engine horsepower from rated engine speed down to approximately 1600 rpm (shown on the x-axis in image above, with power kilowatt shown in the y-axis), which is peak engine torque.
Horsepower levels are increased above base equipment power bulge values.
If the PTO is engaged and the engine rpm stays near rated speed of 2100 rpm, the full additional power potential for the tractor model will be available for use to handle additional load from the implement or changing terrain.
If the PTO is not in use and in transport operation, and the rpm has dropped off of rated speed, usable additional power boost of IPM will taper off as rpm decreases. The chart above (with 8345R Tractor power curves) shows the relationship of how much additional usable horsepower is available in the operating range. All tractors operate in a similar manner with this feature.
Operator visibility and control of operation
Engine power display
All tractors have the power meter display function as base equipment. The operator can observe when full capabilities of the tractor are being utilized. This function graphically displays power utilization up to rated horsepower and power bulge.
The power meter can be found in the CommandCenter™ display. If the engine is off or has minimal load, the power meter will not fill in. The meter is similar in concept to a cellular phone's signal-strength meter. As the power increases, it will fill in bars in an icon. The display will also show the level of additional power being used. The long section represents up to the rated power. The smaller section represents power bulge and is an indicator of additional power available with IPM.
Via the CommandCenter, there is also the ability to enable or disable the function. The operator's manual provides simple details about navigating the engine screen.
IPM is automatically enabled each time the tractor is started.
Tractor compatibility with additional power
IPM has been thoroughly tested by John Deere engineers to be compatible with the base tractor equipment with no impact to reliability. John Deere provides IPM as opposed to unapproved aftermarket devices that boost power without regard to engine, transmission, axles, and drawbar, or hitch capability.
This feature provides optimal utilization of tractor components. For example, with PTO operation, power goes through axles to move the tractor along the ground and turn the PTO shaft and implement. Adding power to both of these systems does not overload either one individually. At transport speeds, drive train torque load decreases significantly from levels seen at low field speeds. Adding power at transport does not overload transmissions or axles.
Aftermarket devices are not selective when power increases are available. Great amounts of power increase are promised with these devices. Large power changes are not compatible with base tractor equipment. To note, base tractor equipment changes as power increases. Larger parts, like hitches, drawbars, tire size, drive train components, axle diameters, and engine calibrations for emission performance and cooling, ensure durability of the total vehicle as power increases. Operating outside of the design capabilities of the tractor base equipment will have an impact on durability and reliability.