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DME continuously controls signals of Valvetronic sensors and immediately records the error messages regarding their performance, if signals of sensors are incorrect. Even more – DME collects the information regarding this coherence (I/U) for the current motor.Īccordingly – DME will record the error message regarding absolute value (power/current consumption too high or too low), also the error messages regarding correlation/plausibility, if under the same conditions the current, consumed by the motor, will be significantly different ī) module of sensors. DME contains the map with information about the allowed consumption of the current, depending on the voltage, supplied to it. The first group of defects: faults, detected by DME.Ī) motor. DME controls the voltage, supplied to the motor (the Bridge type controller is used to manage the voltage – the voltage can change the polarity) and current, consumed by it ī) position of the eccentric shaft is controlled by very accurate Holl sensor module, which is placed at the end of the shaft, near the first cylinder.
Bmw inpa for n51 engine how to#
More detailed information, how does the Valvetronic works, you can find in the aftersales materials of BMW AG, in this entry I will pay more attention, how to detect defects of Valvetronic.Ī) motor (1) is a regular DC motor, connected with 2 pin connection. In the picture – construction of Valvetronic. 0.8 mm) and maximal – pressing the accelerator pedal to the end. The stroke of the valves is minimal in idle (0.4. With Valvetronic – the throttle is fully opened, the amount of air is manages with the stroke of inlet valves (0.4. Without Valvetronic – the air supply is managed with throttle opening, inlet valves in all cases are opening with maximum stroke (8. How does the performance of the engine differ with and without Valvetronic?
Bmw inpa for n51 engine series#
The effect is similar to using the principle of Stratified charge in N43/N53 series engines. 15% fuel economy (larger economy is in low/average load area and idle). The avoidance of such air pumping gives even till 10. If the amount of air is regulated with inlet valves, not throttle, there is no air shortage in the inlet manifold – the air is not “sucked out”, and pumping losses are avoided. Why is it Valvetronic necessary, if the engine already has a throttle? Valvetronic changes (reduces) the opening of inlet valves and allows the inlet valves to perform as an individual throttle of each cylinder. So in this post, I will gather my experience regarding Valvetronic. Of course, sometimes it can really be damaged, but the understanding about this hub is limited – “that on the top of the engine”, and it’s replaced without reason. In the same time, it’s “last hope” of the engine repair specialists – if they are not able to find the cause of the problem, most probably, Valvetronic will be the one to blame. Valvetronic is, most probably, the most hated hub of the BMW engine.