SU744141A1 - I.c.engine starting arrangement - Google Patents

Description

one

The invention relates to a pulse technique and can be used to start an internal combustion engine (ICE), in particular a rotary piston.

A device for starting an engine of 5 internal combustion bodies is known, consisting of a starter power supply unit, a block for generating a control signal depending on the speed of rotation of the engine, a zener diode, an integrating circuit for creating a control voltage directly related to the speed of rotation. the engine and the block that turns off the starter. The device automatically turns off the starter during the engine start process when the engine reaches a predetermined rotational speed and allows the starter to turn on when the engine speed decreases, but it has a low reliability of 1.20

Of the known devices, the closest in technical essence is an internal combustion engine starting device containing an alternating current generator, a battery connected 25 through the starter relay contact to the starter and to the primary winding of the ignition coil, the other output of which is connected to the automatic turn off the starter containing a zener diode, integrating 30

a chain forming a chain consisting of resistors and a capacitor and a dna connected in parallel, a switching circuit on two transistors, one of which includes the automatic starter relay winding, the contacts of which are included in the starter winding circuit.

The device has a number of significant drawbacks, in particular, it is possible to note the unreliability of the device in connection with a given moment when the starter turns off in the process of starting the engine.

If the device is adjusted to turn off the starter when the engine speed lies between the starting and idling speeds, the conditions for starting the engine at negative temperatures deteriorate. When the engine is started, the presence of separate flashes in the combustion chambers, at the moment of which the engine speed may exceed idling speed, leads to the starter disconnection in the event that the engine has not started. If the device is adjusted to turn off the starter at engine speed above idle, but below engine speed leading to starter spacing, then it can safely start the engine at negative temperatures, but at the same time it is possible to turn the -starter on idle the engine. And this may lead to premature starter failure of the system, to chipping of the flywheel teeth of the engine. In the case of a rotary piston engine, the probability of starting the starter with the engine running increases as the rotary piston engines operate with less noise and vibrations compared to reciprocating engines.

The device also does not provide protection of the transistor, in the collector circuit of which a relay winding with inductance is included, against reverse voltage polarity at the moment of switching the transistor. This may cause the entire device to fail.

In addition, the device does not have a temperature stabilization threshold, which will result in the device not meeting the requirements imposed on it.

The purpose of the invention is to increase the reliability of the protection of the starter from starting when the engine is running and to improve the cold start of the engine.

The goal is achieved in that an internal combustion engine starting device containing an alternator, a battery connected through the starter relay contacts to the starter and to the primary winding of the ignition coil, another output of which is connected to an automatic starter disconnecting unit containing a zener diode integrating a chain forming a chain consisting of a parallel-connected resistor and a capacitor and a diode, a non-switching circuit on two transistors, into the collector circuit of one of otorrhea enabled relay winding deviation automatic starter contacts are included in the starter relay coil circuit protection unit starter introduced by incorporating with the engine running, the input of which is connected to the starter relay-contact, and an output - to an intermediate point of the alternator windings.

In addition, this goal is also achieved by the fact that the starter protection unit is made of two transistors, the emitters of which are connected to a common bus, the collector of the first through the winding of the starter protection relay and a diode connected to the output of the starter protection unit, two resistors are connected to the base of the first transistor one of which is connected to the common bus and the other to the collector of the second transistor, the base of the second transistor is connected via a divider on two resistors to the input of the starter protection unit, and the common point of the mentioned resistors is the zener diode is connected with a common length, and diodes are connected parallel to the windings of the automatic starter relay and the starter protection relay. The drawing shows the electric

schematic diagram of the device.

The device for starting the internal combustion engine contains a block 1 of the automatic shutdown of the starter and the block 2 of protecting the starter from starting when running

the engine. The automatic starter unit 1 consists of a zener diode 3, an integrating chain, including a capacitor 4 and a resistor 5 that forces the chains (to form a control

voltage), which includes a diode 6, a capacitor 7 and a resistor 8, a switching starter circuit assembled on transistors 9 and 10. In the collector circuit of transistor 10 an automatic winding relay 11 is connected

disconnection of the starter, whose contacts 12 are included in the starter relay circuit. To protect the transistor 10 from breakdown, a diode 13 is switched on in the switching time of the transistor. Block 2 of the protection against the inclusion of the starter

the running engine is made on transistors 14 and 15 and the starter protection relay 16 with normally closed contacts 17 ..

The device works as follows.

The control signal, depending on the speed of rotation of the engine, is removed from the primary winding 18 of the ignition coil. When the ignition key is turned to the "Starter" position, the contacts 19 of the starter relay close and the power from the battery 20 is supplied to the automatic starter unit. Transistor 10 opens, AND relay triggers

its contacts 12 starter relay circuit 21. Starter starts scrolling the engine. When a certain speed is reached, the transistor 9 opens and the transistor 10 closes, the AND relay turns off and breaks the starter relay circuit 21, and the starter 22 turns off.

The starter protection unit with the engine running is connected between the contacts 23 of the starter relay and the midpoint

24 alternators. Transistors 14 and 15 operate in key mode. When the starter 22 is turned on when the engine is not running, the contacts 23 of the starter relay close and the supply voltage sets into the base of transistor 14, which, when opened, keeps the transistor 15 locked. Relay 16 is turned off. After starting the engine, the starter 22 turns off, the contacts 23 of the starter relay open, the transistor 14 closes, and the transistor 15 opens, as it is powered from the midpoint 24 of the alternator. Relay 15 is triggered and opens the contacts in the relay starter 21 circuit. This prevents the starter 22 from starting up with the engine running.

Thus, by increasing the reliable protection of the starter from starting up with the engine running and improving the cold start conditions of the engine, the device allows to increase the durability of the starter, since the life of the starters of starters in most cases is 100,000 km or 50,000 inclusions. According to statistics, every third inclusion with overexposure. Startup time averages 4 seconds, overexposure 2s. In normal starting, the starter measles rotates at 2000 rpm. When overexposed, the speed of the starter core reaches 5000 rpm. From here it is easy to determine that during launch time without a re2000. 100 about:; Keeps the starter doing ---, 2 vol.

60 5000

During overexposure

, 6 about.

60

That is, for the entire period of operation, when starting without overexposure, the starter makes 133.2-50000 6660000 vol. Given the overexposure, the starter for the entire period of operation will make an additional 166.6- / s-50000 2748900 vol., And a total of 6660000 + 2748900 9408900 vol. Thus, the starter bearings operate with a load that is almost 1.5 times greater than the load when the starter operates without overexposure.

If this is considered in relation to a rotary piston engine, then this result will be even more impressive, since the rotary piston engine has a greater acceleration compared with reciprocating engines and grows faster at start-up. The speed of the starter core when starting with overexposure molset reach 8000-10000 rev / min. In addition, prolonged overexposure can lead to the failure of the burner coupling.

When you turn on the starter when the engine is running, there is a danger of chipping the teeth of the starter gear and the flywheel crown teeth. The destruction of the teeth of the starter gear leads to the failure of the starter drive. When chipping the teeth of the flywheel ring, the flywheel needs to be replaced, which is associated with disassembling the engine and balancing the engine parts (the costs of repair are increased).

Claims (3)

1. An internal combustion engine start device containing an alternator, a battery connected through the starter relay contacts to the starter and to the primary winding of the ignition coil, another output of which is connected to an automatic starter deflection unit containing a zener diode integrating the chain forming the chain, consisting of a parallel-connected resistor and a capacitor and a diode, a switching circuit on two transistors, one of which includes a relay coil in the collector circuit of one Starter switch-off, the contacts of which are included in the winding circuit of the starter relay, characterized in that, in order to increase the reliability of the starter protection against switching on when the engine is running and to improve the cold start of the engine, the starter protection unit is inserted from turning on when the engine is running, connected to the relay contacts of the starter, and the output - to the middle point of the winding of the alternator. 2. The device according to claim 1, characterized in that the starter protection unit is made on two transistors, the emitters of which are connected to the common bus, the collector of the first - through the winding of the starter protection relay and the diode is connected to the output of the starter protection unit, two resistors are connected to the base of the first transistor, one of which is connected to the common bus and the other transistor, the base of the second transistor through a divider on two resistors connected to the input of the block starter protection, and the common point of the mentioned resistors is via a zener diode connected with a common fault. 3. Internal Combustion Engine Start POPP. 1 and 2, characterized in that diodes are connected parallel to the windings of the automatic starter relay and the starter protection relay. Sources of information taken into account in the examination 1. UK patent number 1323687, cl. H 2H, 1970. 2. US patent No. 3452210, cl. 290-38, 1969. R .