The crankshaft position sensor is used to control the internal combustion engine.With the help of the electronic unit on the microprocessor reads.More specifically, it determines whether the position of the crankshaft is based on that, spots where the pistons at any given time.This parameter is required for the proper operation of the injection and timing.
Basic properties DPKV
name from this device a few, all are equal.The most common term "crankshaft position sensor" for short - DPKV.Sometimes it is called TDC sensor, a little more often - or sensor phase synchronization.But how to describe it, the breakdown leads to the fact that the engine is stopped and can not continue to work.The reason is that it determines at what point of time it is necessary to put the discharge at the spark plug electrodes.
In the event that the motor is stopped, will not start, even though the rubber timing belt and transmits a movement to the camshaft, can judge the fault DPKV.In addition, the instrument panel whe
DPKV design and its main elements
crankshaft position sensor VAZ has enough simple scheme.It has a few basic elements:
- magnetized core of steel.
- frame of nylon.
- top of the frame held winding thin copper wires varnish insulation.
- All elements potted.
DPKV Set in the immediate vicinity of the crankshaft pulley on which there are teeth.Moreover, all of them should be 60, but at one point the two cut.Through this gap the control unit sees the first cylinder when the piston is at TDC.
principle of the sensor
DPKV The work on the principle of electromagnetic induction.Upon rotation of the crankshaft pulley with teeth moves near the sensing surface of the sensor.At a time when the metal tooth passes near DPKV, winding begins to generate a weak pulse.Such surges in one revolution takes 60 (the number of teeth on the pulley).But there is a small gap, as mentioned earlier.
Due to the fact that there is a gap between the teeth, at some point, increasing the time interval between pulses.ECU sees the crankshaft begins to make the next turn.At the same time the crankshaft position sensor 2110 counts 20 pulses.This is exactly the time when the first cylinder piston is located at the uppermost position.It is through this produced voltage supply to the electrode spark.
its location - on the part of the timing.This place is a generator drive pulley, which marked the teeth.The sensor is located on the engine side, which is closer to the bulkhead.Not a very convenient location to spend a replacement, need to remove the right wheel.Connecting the device to the on-board network is made by means of wire, its length is 0.7 meters.
Incidentally, you can make artless anti-theft system, using the signal from the crankshaft position sensor.It is enough to enable it to establish a chain of simple relay with normally open contacts.The ignition key is to build in a small but strong magnet, and the castle - reed.Such a simple circuit can protect the car from theft, since the slightest distortion or altogether interrupt signal from the sensor leads to a complete stop of the engine.
Immediately it should be noted that the sensor is affected by many factors.And you need to look carefully to ensure that there was no interference from high-voltage wires.If they are, then the dashboard, you may receive the error, although the engine will operate normally.The presence of warnings misleading, since no visible sign appears.
To check, you will need only a multimeter.The main thing - to be able to measure the resistance of the sensor windings.To do this, disconnect the plug and connect the multimeter.The resistance value should be about 0,85-0,9 Ohm.If it deviates from this in any direction, there is a short circuit between turns.The signal is distorted as a result, the ECU does not perceive it.It is also often the case and wire break.As a result, there is no signal at all.
Sensor Replacement To remove the old and install a new one instead, you will need to lift the right side of the car.After that unscrews the bolts on the wheel to gain access to the installation site DPKV.In fact, the crankshaft position sensor, which is only a replacement for such a scheme, and can be removed without removing the wheels.However, the convenience of this.Therefore it is better to raise the car on jack.
Remember when replacing that the gap between the top of the pulley tooth and the sensor surface of the sensor should be in the range 1-1.5 mm.Otherwise it does not work correctly becomes.
Here what the crankshaft position sensor.Its price is about 300-350 rubles.It is always best to keep in the glove compartment of a spare, so that his failure was not a surprise to you.