11-6-3-5-blok-upravleniya-ehpkhkh.html

11.6.3.5. EPHH control unit

On the engine of fashion. 331 with the carburetor like "Soleks" the EPHH control unit of 50.3761 type intended for control of the electromagnetic valve is used.

The control unit continuously controls the frequency of rotation of a bent shaft of the engine by measurement of the period of repetition of impulses of system of ignition which are removed from the coil of ignition and move on a conclusion of "1" control unit. Besides, from the sensor screw in the control unit the signal allowing to distinguish the open or completely closed provisions of a butterfly valve is given.

With a frequency of rotation of a bent shaft of the engine less than 1245 min.^-1 irrespective of a sensor screw signal conclusions "4" and "6" control units have the electric communication leading to passing of current through a winding of the electromagnetic valve.

At an open butterfly valve mobile and motionless contacts of the sensor screw are opened also conclusions "4" and "6" control units have electric communication irrespective of the frequency of rotation of a bent shaft of the engine.

After short circuit of contacts of the sensor screw provided that the frequency of rotation of a bent shaft of the engine exceeds 1245 ^min.-1, electric communication of conclusions "4" and "6" control units are broken off and again is restored or after decrease in frequency of rotation to 1245 rpm, or after disconnection of contacts of the sensor screw.