X Series E70 X5 3.0Si (N52K) OFFRD
driving situation. In this way as soon as the cooling requirement of the engine falls, the air resistance of the vehicle
can be reduced.
The X5 contains the following advanced engineering features in the powertrain area:
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Spark-ignition engines
For the market launch the familiar N52B30O1 and N62B48O1 spark-ignition engines will be used. However the
engines shall be adapted in certain respects.
The exhaust system, the cooling system and the fuel supply system are specific to the vehicle.
The belt drive has been adapted to the increase in the number of optional extras. On the power takeoff side, the
transfer case has been redesigned.
In addition, a modified rear axle transmission is used in the X5 4.8i and 3.0d. The way in which the drive shaft
and power takeoff shafts are coupled with the rear axle is new.
The N52B30O1 will be equipped from 10/2007 with a map-controlled oil pressure regulator. The coolant
temperature sensor at the cooler outlet has been omitted.
With the E71, the new N63B44O0 8-cylinder spark-ignition engine will be introduced to the market. In addition,
the N54B30O0 6-cylinder spark-ignition engine with 2 turbo chargers will also be used in the E71.
[more...]
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Diesel engines
The vehicle contains the 2 familiar diesel engines:
•
M57D30O2 (turbo charged)
•
M57D30T2 (2-level turbo charging)
A new exhaust system has been developed for these diesel engines that satisfies the high expectations on this
vehicle (e.g. with respect to exhaust emissions, noise). These diesel engines comply as standard with the
exhaust norm EURO 4. The oxidation catalysator is installed close to the engine. The diesel particle filter is
accommodated in the same housing.
The M57D30T2 is equipped with a pressure-controlled fuel low pressure system.
A fuel-pressure-temperature sensor measures the pressure and the temperature in the fuel low-pressure
system. The signals are received by the Digital Diesel Electronics (DDE).
The DDE actuates the fuel pump controller (EKPS control unit).
The EKPS control unit in turn actuates the fuel pump.
This enables very precise and responsive fuel delivery.
[more...]
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Intelligent alternator regulation
The intelligent alternator regulation is a function of the engine controller.
The intelligent alternator regulation represents a refinement of the recharging strategy for the vehicle battery.
The vehicle battery is no longer completely recharged but charged to a certain degree depending on various
external conditions (ambient temperature, battery age etc.).
In contrast to conventional recharging strategies, the battery is only recharged when the vehicle is coasting. In
the process the alternator receives maximum stimulus, electrical energy is produced and fed into the vehicle
battery.
No fuel is consumed in the process. The kinetic energy from the coasting vehicle drives the alternator via the
wheels and engine. Electrical energy is generated.
The alternator is not actuated during acceleration phases of the vehicle. This means no energy and more
specifically no fuel is used to generate electrical energy.
SBT Electrical systems E70, E71
BMW AG - TIS
07.02.2013 11:39
Issue status (12/2007) Valid only until next DVD is issued
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