RU38973U1 - STARTER LOCK DEVICE - Google Patents

Abstract

The utility model relates to transport equipment, namely, devices for blocking starters and can be used to ensure trouble-free operation of starters for cars and trucks and other vehicles. The technical result, which consists in increasing the accuracy of implementing the temperature dependence of the thresholds, is achieved due to the fact that a starter blocking device containing an amplifier limiter, a "D" trigger, an integrating circuit, a temperature-dependent element, an output stage, and a thermally dependent element is included in the power circuit " D "trigger, the output of the trigger is connected to the input of the output key, the output of which is connected to the" R "input" D "of the trigger.

Description

The utility model relates to transport equipment, namely, devices for blocking starters and can be used to ensure trouble-free operation of starters for cars and trucks and other vehicles.

A device for blocking a starter is known, comprising a limiter amplifier, an integrating circuit connected to the output of the limiter amplifier through a diode, a comparator, the input of which is connected to a capacitor of the integrating circuit. The reference input of the comparator is connected to a voltage divider containing a resistor and a thermally dependent element, for example, a thermistor. The output of the comparator is connected to the input of the trigger, one of the outputs of which is connected to the starter relay [1].

A disadvantage of the known technical solution is the low accuracy of the implementation of the necessary temperature dependence of the thresholds of the device.

The objective of the proposed solution is to eliminate the above drawback, namely improving the accuracy of the implementation of the temperature dependence of the thresholds.

The task is achieved due to the fact that the proposed starter lock device containing an amplifier limiter, a "D" trigger, an integrating circuit, a temperature-dependent element, an output stage, and

a thermo-dependent element is included in the power supply circuit of the “D” trigger, the output of the trigger is connected to the input of the output key, the output of which is connected to the “R” input of the “D” trigger.

The drawing shows a diagram of the starter lock device.

The starter locking device comprises an amplifier limiter 1, an integrating circuit connected through a diode 2 to an amplifier limiter, comprising a resistor 3 and a capacitor 4 connected in series between the power source. A differentiating circuit consisting of a series capacitor 5 and a resistor 6 is connected between the power terminals, the output of which is connected with the "S" input "D" of the trigger 7, the thermo-dependent element 8 is connected between the power source and the power "D" of the trigger. The capacitor of the integrating circuit is connected to the "C" input "D" of the trigger 7, the output of which is connected to the input of the transistor switch 9, the output of the latter is connected to the relay, which includes the starter 10, and to the "R" input "D" of the trigger.

The device operates as follows.

When a supply voltage is supplied from the ignition switch to the short circuit terminal of the device, the differentiating circuit from the capacitor 5 and resistor 6 generates a pulse of positive polarity, which is applied to the "S" input "D" of trigger 7 and sets it to the state when there is a positive potential at the direct output , which is applied to the input of the transistor switch 9 and opens it, preparing to turn on the starter relay 10. The capacitor 4 of the integrating circuit is charged through the resistor 3 to the level of the supply voltage. When a supply voltage is supplied from the ignition switch to the starter relay 10 (terminal CT of the device), the latter is triggered by connecting the starter to the battery with its contacts. After starting the engine, a sinusoidal signal appears in the input of the device, proportional to the crankshaft speed

motor shaft. The amplifier limiter generates rectangular pulses from this signal, which discharge the capacitor 4 through the diode 2 and the internal resistance of the amplifier of the limiter. When the engine speed reaches a predetermined one, the voltage across the capacitor 4, the charge time constant of which is determined by the resistor 3, and the discharge time constant is the frequency of the input signal below the trigger threshold of trigger 7, which is equivalent to a negative voltage drop at the input "C", the trigger switches in such a way that on a direct exit de zero potential appears, this causes the transistor switch 9 to close and the starter relay 10 to disconnect. A positive potential appears on the collector of the transistor switch 9, which is applied to the "R" input of trigger 7, making it impossible to connect it again with any potential changes in the water "C" . Starting the starter is not possible until the ignition is turned on.

If the starter did not start when the starter was turned on, then at the moment of voltage removal from the ST terminal, a self-induction pulse appears in the winding of the starter relay 10, applied to the input R of the trigger 7 of positive polarity, which switches it to the zero potential state at the direct input, making it impossible to restart starter without first turning on the power from terminal 3 of the device (i.e., turning off the ignition). To ensure the temperature dependence of the starter cut-off threshold, a thermo-dependent element (thermistor) is included in the trigger power circuit 8. At high temperatures, the resistance of the thermistor is small, the trigger voltage is high and the trigger threshold for input “C” is high, and when the input signal is applied, the trigger switches over low engine speed. When the temperature decreases, the resistance of the thermally dependent element 8 increases, respectively, the supply voltage decreases

trigger and the trigger threshold at the input "C", which requires a deeper discharge of the capacitor 4 to switch the trigger, ie, a higher engine speed, which is necessary in winter conditions.

The proposed device allows to increase the accuracy of the temperature dependence of the thresholds. The use of "D" trigger allows you to combine the functions of the comparator and the starter lock, which leads to a simplification of the device.

Sources of information:

1. Tanengolz L.Ya. "Faults in the electrical equipment of cars" Military Publishing House, 1994 edition 3, p. 106

Claims (1)

A starter lock device comprising an amplifier-limiter, an integrating circuit, a D trigger, a thermally dependent element, an output stage, characterized in that the thermally dependent element is included in the supply circuit of the D trigger, the output of the trigger is connected to the input of the output key, the output of which is connected to the R input of the D trigger .