SU1514968A1 - Electric starting system for ic-engine - Google Patents

Abstract

The invention relates to mechanical engineering, in particular, to engine-building, namely to control devices for electric starting of internal combustion engines, and can be used on vehicles. The aim of the invention is to increase the reliability of the system by preventing the possibility of overvoltage at the output of the generator, as well as by increasing the reliability of the starter lock when the engine is running and by preventing the starter from turning on during its inertial rotation. The system contains a battery 1, a starter 2, a generator 3 with main and additional rectifiers, a mass switch 4, a starter relay 5 with a closing contact 6, a blocking relay 7 with a closing contact 8 and two opening contacts 9 and 10, a threshold element 11 , starter button 12, isolation diode 13, protective relay 14 with closing contact 15, oil pressure sensor 16 with opening contact 17, resistor 18. The threshold element may consist of comparator 19, reference voltage source 20, voltage divider 21 with resistors 22 and 23 konde Nasator 24, Zener diode 25. The system can include an isolating diode 26. When the oil pressure sensor 16 in the engine is triggered, a protective relay 14 is switched on and its contact 15 bypasses the ground switch 4. With the engine running, as well as with the inertial rotation of the starter 2, the voltage is applied to the comparator 19, due to which the starter relay 5 is prevented from turning on. 3 hp f-ly, 1 ill.

Description

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poBbii i element 11, starter button 12, separation diode 13, protection turnip 14 with closing contact 15, oil pressure sensor 15 with opening contact 17, resistor 18. Threshold element may consist of comparator 19, reference voltage source 20, divider 21 voltages with resistors 22 and 23, capacitor 2A, stabilizer-ia 25. The system can have

a separating diode 26 is turned on. When the engine oil pressure sensor 16 is triggered, the protective relay 14 is turned on and its contact 15 shuts down the ground switch 4. With the engine running, as well as with the inertial rotation of the starter 2, the voltage is applied to the comparator 19, due to which the starter relay 5 is prevented from turning on. 3 hp f-ly, 1 ill.

The invention relates to machine building, in particular, to an engine, namely to electric starter control devices of an internal combustion engine, and can be used on vehicles.

The aim of the invention is to increase the system reliability by preventing the possibility of re-stressing at the generator output, ia also by increasing the reliability of the starter lock when the engine is running and by preventing it. turning on the starter during its inertial rotation.

The drawing shows a diagram of a system for the electric start of an internal combustion engine.

The system contains a battery 1, a starter 2, a generator 3 s: main and additional rectifiers (not shown), a switch 4: a mass 4, a starter relay 5 with a closing contact 6., a blocking relay 7 with the closing contact 8 and two breaking contacts 9 and 10, the threshold element 11, the starter button 12 and the separation diode 13, and the battery 1 is connected to the system through the ground switch 4, the starter 2 is connected to the battery 1 through the closing contact 6 starter relays 5, starter relay 5 connected to the battery l of the secondary battery 1 via a starter button 12 and the lead-out track 8, the relay 7 blokschyuvki yield additional rectifier (not shown) of the generator 3 is connected to a lock relay 7 through the entry threshold element 11.

The system also includes a protective relay 14 with a closing contact 15,

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oil pressure sensor 16 with a break contact 17, a resistor 18, while the closing contact 15 of the protective relay 14 is connected in parallel to the ground switch 4, the input of the protective relay 14 is connected to the battery I through serially connected separation diode 13, the first time 9 of the relay 9 relay 7 and the resistor 18, and the disconnecting contact 17 of the oil pressure sensor 16 is connected to the connection point of the resistor 18 and the first disconnecting contact 9 of the blocking relay 7. The threshold element 11 may consist of a comparator 19, a voltage source 20, a voltage divider 21 with resistors 22 and 23, a capacitor 24, a zener diode 25, and the series-connected resistors 22 and 23 of the voltage divider 21 are connected to the output of an additional rectifier ( not shown in the drawing) of the generator 3, the connection point of the resistors 22 and 23 of the voltage divider 2 is connected to one input of the comparator 19 and at the same time to the zener diode 25 and the capacitor 24, the reference source 20 is connected to the other input of the comparator 19, and you od comparator 19 is connected to a lock relay WMOs row 7. The opening contact 17 of the oil pressure sensor 16 can be pushed through the first disconnecting contact 9 of the lockout relay 7 and the separation diode 13 to the input of the threshold element 11. The system can be switched on to the isolating diode 26, while the starter 2 is connected to the resistor connection point 22 and 23 voltage divider 21 through the second break contact 10 of lockout relay 7 and isolating diode 26.

The system works as follows.

When the engine is not running, the voltage at the output of the additional rectifier (not shown) of the generator 3 is zero, and the contact 17 of the oil pressure sensor 16 is closed, i.e. input voltage threshold element 1I is missing.

In order to start the engine, the ground switch 4 is closed and the starter button 12 is pressed. Since, in this case, the threshold element 11 is in the off state, the blocking relay 7 is activated through its output circuit. Terminal 8 of lock 7 is closed and power is supplied to starter relay 5. The relay 5 of the st.Arter is activated, its contact 6 is closed and the starter 2 is connected to the battery 1. The engine of the internal combustion engine starts and the generator 3 is turned on.

With the help of the threshold element I1, the voltage at the output of the additional rectifier of the generator 3 is measured. When the engine reaches the rotational speed corresponding to its stable operation, the threshold element 1I operates and turns off the lockout relay 7. Accordingly, the starter relay 5 and the starter motor 2 are also disconnected, and the starter motor 2 is disconnected regardless of whether the starter button 12 is pressed. After starting the engine, the oil pressure switch 16 also triggers and opens contact 17. At the same time, the voltage of battery 1 through resistor 18, contact 9 of lockout relay 7 separates diode 13 to enter the input of protective relay 1.4 and simultaneously to the input of threshold element 11. Protective relay 14 is triggered and its pin 15 shunts the switch 4 on the assy. This prevents the occurrence of overvoltages at the output of the main rectifier of the generator 3 when the mass switch 4 is accidentally disconnected during engine operation. The contact 15 of the zazitny relay 14 is selected from the word of the possibility of the charging current of the battery 1 through it. When the engine is stopped, the contact 17 of the oil pressure sensor 16 is closed, the signal from the input of the protective relay 14 is removed and the contact 15 is disconnected14968

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kats, i.e. engine starting is only possible when the mass switch 4 is reclosed.

The signal arriving after starting the engine to the input of threshold element 11 along the circuit: resistor 18, pin 9, diode 13, duplicates the signal from the output of the additional rectifier of generator 3 and prevents starter 2 from turning on when the engine is running. Moreover, for the duration of the start, the contact 9 of the lockout relay 7 breaks the indicated circuit, as a result of which the starter 2 can be turned off if the oil pressure sensor 16 triggers falsely during engine scrolling.

When the threshold element 11 is executed on the basis of the comparator 19, the signal from the output of the additional rectifier of the generator 3 is fed to the divider 21. The voltage at the output of the divider 21 is compared by means of the comparator 19 with the reference voltage of the source 20. The reference voltage is about 1 B. The threshold for triggering the element 11 is set by selecting the value of the resistor 23 of the voltage divider 21.

After starting the internal combustion engine, i.e. after releasing the locking relay 7 and the starter relay 5 to the input of the comparator 19, connected to the voltage divider I1, the EMF of the starter motor 2 rotating by inertia enters through the locking contact 10 of the locking relay 7 and the decoupling diode 26. If the internal combustion engine does not start, this will trigger the comparator 19 and prevent the starter 2, which is inertia rotating, from starting.

Capacitor 24 and zener diode 25. prevents the input of the comparator 19, connected to the output of the additional rectifier of the generator 3, from impulse noise and overvoltages.

Claims (3)

1. The electric start system of the internal combustion engine, containing a battery, a starter motor, a generator with a rectifier, a mass switch, a starter relay with a closing contact, a blocking relay with contacts, a threshold element. a starter button and a separating diode, the battery being turned on —in the system via a mass switch, the starter is connected to the battery via the starter relay contact, the starter relay is connected to the battery through the starter button and the lockout relay contact is switched on to the input of the blocking relay through the threshold element, about tl, and —chich, and with the fact that, in order to improve reliability by preventing the possibility of overvoltage at the generator output, the supply system and a protective relay with a NibiKaiouiHM coitac ohm, an oil pressure sensor with an open contact and a resistor, the blocking relay is made with two break contacts, the closing contact of the protective relay is connected in parallel to the ground switch, the input of the protective relay is connected to the battery of the third battery - a cut-in series of isolating diode, the first softening contact of the blocking relay and the resistor, and the disconnecting pin of the oil pressure sensor is connected to the solenoid line of the resistor and the first disconnecting contact of the relay b locking, 2. The system according to claim 1, wherein the threshold element 5 0 5 Q consists of a comparator, a reference voltage source, a voltage divider with resistors, a capacitor and a zener diode; the series-connected resistors of the voltage divider are connected to the generator, the connection point of the voltage divider resistors is connected to one comparator input and simultaneously to the stabilizer and the capacitor, the source the reference voltage is connected to another input of the comparator, and the output of the comparator is connected to the input of the blocking relay. 3. Pop-1 system, characterized in that, in order to increase the reliability of the starter lock when the engine is running, I open and search for the contact of the oil pressure sensor through the first open contact of the lock relay and the isolation diode is connected to the input of the threshold element. 4, The system of PP. 2 and 3, in order to prevent the starter from turning on during its inertial rotation, it is equipped with an isolating diode, the starter being connected to the connection point of the voltage divider resistors through a second break contact blocking relay and isolating diode.