Starter blocking device. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Starter blocking device. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Automobile. Ignition

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The proposed device is suitable for installation on most car models. It prevents erroneous activation of the starter when the engine is running, has great reliability, which is achieved by the introduction of an RC circuit that protects the device from the influence of the contact bounce of the ignition switch at the time of start-up and operation of the starter.

The device is connected to the vehicle's electrical circuits (the SA1 ignition switch and the K1 traction relay are part of the vehicle's electrical system). The blocking device with pins 2 and 3 is included in the break in the wire from the ignition switch to the traction relay K1. The device consists of switching VS1 and blocking VS2 keys and circuits for their launch.

Starter lock device

Construction and details. Any trinistor from the KU202 series can be used in a switching key, while an instance with the highest possible resistance of the control transition (at least 100 ohms) must be selected with forward and reverse current through it. The required capacitance of the capacitor C1 depends on the value of this resistance. Trinistor VS2 type KU101 with any letter index. Diode VD1 type KD202Zh, VD2 type D223; capacitor type K50-6; MLT resistors.

When assembling, it is necessary to take into account that the device will be operated in harsh conditions (high and low temperatures, strong vibration, humidity, oil ingress on the device, etc.).

Adjustment not required if the device is correctly assembled from serviceable parts. At the moment when the trinistor VS1 opens, the capacitor C1 is recharged from pin 2 through the control transition of the trinistor and resistor R1. In this case, the charging current flows through the control transition of the trinistor in the opposite (non-working) direction. This can be eliminated by turning on another diode D223 between the cathode and the control electrode of the trinistor (the anode to the cathode of the trinistor). In the presence of this diode, it is practically not required to select a trinistor.

Author: A.Kuzema

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