- Mon Dec 26, 2022 6:44 am
#60108
Hey guys, i working in my brazilian Dodge Polara, and they use a Bosch Hall Distributor with Magnetti Marelli 1AVP hall shutter wheel. The difference is in the size of tooths, in bosch we have 4 equal tooths, and 1AVP, we have a 1 big tooth, so you can make a sequencial injection using a basic distributor. My question is, how i can make the speed work full sequencial with that distributor? Because, 1AVP, is a ECU that works completely sequentially, just using the distributor, after all, the distributor plays the role of sequential ignition, just needing to inform the phase signal for the injection through it.
This text i took in 1AVP manual:
This sensor, which is part of the ignition distributor itself, sends signals to the
command to calculate the engine speed and identify the position of the first cylinder to synchronize the
sequential injection and detonation control individually per cylinder. It is composed of a magnet
permanent, Hall integrated circuit and a metallic rotor with four windows, fixed directly to the tree
from the distributor.
The Hall sensor is powered directly by the 1 AVB system control unit and, its
operation is based on the emission of negative signals that generate, internally in the unit, a
12V voltage.
When the metallic rotor opening is between the permanent magnet and the sensor, the magnetic field
of the magnet can reach the sensor. In this condition, the negative signal1 produced, generates in the unit a
12V potential difference. When the sensor is covered by the metal rotor, the field
magnet does not reach the sensor. In this condition the generated signal is 0V.
To calculate the engine speed, the control unit counts the time of the
variation between 0 and 12V. With this time, she manages to know the frequency and, consequently, the
Engine rotation.
The identification of the first cylinder is made by means of a larger window of the metallic rotor. this window,
when exposed to the Hall sensor, corresponds to 72° APMS on the crankshaft (before neutral
top) while the windows of the other cylinders, when exposed, also correspond to 72°
APMS, however, its exposure ends after 66°, with 6° remaining for the piston to reach the
PMS since its windows are smaller.
With this variation, the control unit also obtains information about the angular position of the
crankshaft.
The window corresponding to the TDC position (top dead center) in the combustion phase of the
first cylinder, is 6° larger than the windows of the other cylinders. In this way, the Hall signal is generated
when detecting the opening of the metallic rotor windows taking place 72° before TDC in all
cylinders.
On cylinders 3, 4 and 2, when the Hall signal is interrupted, there are 6° to go before these cylinders
enter PMS.
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