Electronic-mechanical drive of the fuel pump. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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Failures in the operation of the heating system of Zaporozhets vehicles are often associated with a malfunction of the electromagnetic drive of the fuel pump, which has a contact device for switching the electromagnet current. During the operation of the fuel pump, the current interrupted by the contacts exceeds 5 A, which leads to wear of the contacts. Burning of contacts with a violation of their conductivity or, conversely, their "welding" leads to a stop of the fuel pump.
You can increase the reliability of the fuel pump by unloading its contacts by installing a transistor current amplifier in the drive (see diagram). The coil Y1 of the electromagnet is included in the emitter circuit of the transistor key VT1, and the contacts switch its base current.
Diode VD1 protects the transistor from breakdown by self-induction voltage from the winding of the electromagnet V1 at the moments of closing the transistor. The use of a transistor switch can significantly reduce the current through the contacts and increase the reliability of the fuel pump.
The body of the transistor VT1 can be attached directly to the parts that are connected to the car body, which increases the ease of installation. Instead of the KT837A transistor, transistors of the P214-P217 series can be used.
Author: L. Mashkinov, pos. Chernogolovka, Moscow region; Publication: N. Bolshakov, rf.atnn.ru
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