SU1326768A2 - Circuit for connecting starter-generator for internal combustion engine - Google Patents

Abstract

The invention makes it possible to increase the reliability of the starter-generator switching circuit. The relay coil 26 is connected in series with the switch 25. The base of the resistor 28 is connected to the emitter of the transistor 16 through the suppressor resistor 27, and the collector is connected to the cathode of the diode 17 through the indicator 14 connected in parallel with the resistor 15 and the switch 25. When the battery terminals voltage decreases 1 and 2 below the permissible level, the transistor 10 is opened through the resistor 19 of the voltage divider 11, causing the opening of the transistors 16 and 28. The relay 26 is activated, and its contacts 29 disconnect the block 8 from the batteries. The switch 25 allows the motor to start electrically from discharged batteries in an emergency. When the switch 20 is closed, an attempt is made to start up with the most discharged batteries. 1 il. (L 14)

Description

The invention relates to engine operation, engineering, in particular, to electric engine starting devices.

The purpose of the invention is to increase the reliability of the starter-generator switching circuit.

In the drawing, a schematic diagram of the inclusion of a starter-generator for an internal combustion engine is shown.

The circuit contains batteries 1 and 2, connected via contacts 3 of contactor 4 to starter-generator 5, a start-up resistor 6 connected to starter-generator 5 via locking contacts 7 of control unit 8, the closing contacts 9 of which are entered into the power supply contactor 4. The first base transistor 10 is connected to the voltage divider 11 connected by the coil of contactor 4, and the emitter is connected via resistor 12 to the locking contacts 7 and through the Zener diode .13 to the coil of contactor 4. The device also has an indicator 14, limiting The resistor 15, the second transistor 16 and the main diode 17. The voltage divider 11 on the resistors 18 and 19 is connected to the block 8 through the diode 17. The switch 20 serves to start the circuit, closing 21 and opening 22 and 23 contacts of the contactor 4 - for switching batteries 1 and 2 from a parallel connection to a series one when the internal combustion engine is started. The resistor 24 shunts the base-emitter transition of the transistor 16.

In addition, the device contains an additional switch 25 and a relay 26, the coil of which is connected in series with the switch 25, a suppressor resistor 27 and a third transistor 28, the base of which is connected to the emitter of the transistor 16 through a resistor 27, and the collector is connected to the cathode of the diode 17 14 with a resistor 15 and a switch 25 with a coil of a relay 26, the disconnecting contacts 29 of which are introduced into the power supply circuit of the unit 8, and the closing contacts 30 are connected in parallel with the collector-emitter junction of the transistor 28; move The resistor 31 shunts the transition base - emitter of the third transistor

28, and the additional diode 32 - the relay coil 26.

The inclusion scheme works as follows.

When the switch 20 is closed, the block 8 is activated and with its contacts 7 it connects the starter-generator 5 to the batteries through the starting resistor 6 (the first starting level). If the voltage at the terminals of the batteries 1 and 2 remains within acceptable limits, then the transistors 10, 16 and 28 are in the closed state. After a certain time, the contacts 9 of the block 8 are activated.

ten

five

0

five

0

five

0

five

0

five

which connect the contactor 4 coil to the batteries m. The contactor is triggered and by its contacts 3, 21, 22 and 23 switches the batteries 1 and 2 from the parallel connection to the serial one and connects the starter-generator 5 to them (second start level). When switching batteries 1 and 2, the block 8 contacts 7 disconnects the starting resistor 6 from the battery 1, causing the coil of the contactor 4 to switch to series-connected batteries 1 and 2 through the starting resistor 6. It is necessary to take into account the resistor 6 is much less than the resistance of the cathode of the contactor 4. Turning off the switch 20 after starting the engine opens the contacts 9 of the unit 8. The contactor 4 is turned off and the circuit returns to its original position. In the second starting stage, the transistors 10 and 16 also remain in the closed state.

If the voltage at the terminals of the batteries 1 and 2 at the first start-up stage has decreased below the permissible level, the transistor 10 opens through the resistor 19 of the voltage divider 11, causing the transistors 16 and 28 to open. Relay 26 trips and its open contacts 29 disconnect the unit 8 from batteries 1 and 2. The start is stopped, and the glow of the indicator 14 on the control panel informs the driver or operator of the battery's low voltage or deterioration of the contacts in the connecting wires.

An additional switch 25 permits an electrical start-up of the internal combustion engine from the discharged batteries in an emergency. When the switch 20 is closed, an attempt is made to start with the extremely discharged batteries 1 and 2, and the indicator 14 is lit on the first and second stages of the start.

The trigger threshold of the battery condition monitoring device must be selected according to the operating conditions of the vehicles. Controlling the magnitude of the resistor 19 allows the selection of the threshold of the operation of the battery condition monitoring device in accordance with the ambient temperature. Such adjustment is advisable to be carried out twice during the year simultaneously with the preparation of vehicles for the winter or summer season.

The proposed scheme makes it possible to increase the reliability of starting the internal combustion engine by improving the operating conditions of the batteries, since in the case of working with exhausted batteries, only their control is performed, and the transition to the second stage is not started. Additionally, the duration of the battery condition check is reduced, which prevents the batteries from being deeply discharged.

Claims (1)

Invention Formula Starter-generator switching circuit for an internal combustion engine according to aut. St. No. 1134760, characterized in that, in order to increase reliability, an additional switch, a relay equipped with a coil, closing and opening contacts, an additional diode, a relay co-coupling, a third a transistor and a suppressor resistor, the relay coil is connected in series with an additional switch, the base of the third transistor is connected to the emitter of the second transistor through a suppressive resistor, the emitter of the third transistor is connected to the negative pole of the battery, the collector of the third transistor is connected to the main cathode the diode through a parallel-connected battery status indicator and a relay coil with an additional switch, the relay opening contacts are placed between the anode of the main diode and the control unit, and the relay closing contacts are placed between the collector and the emitter of the third transistor.