SU1271996A1 - Device for automatic warm-up of internal combustion engine - Google Patents

Abstract

The invention is intended for automatic warming up of the internal combustion engine of mobile units during their stand periods during the cold season. The aim of the invention is to increase the heating efficiency by increasing the reliability of its start-up by additionally installing a programmable time relay with two inputs in series and a two-input circuit I. When the temperature of the engine decreases, temperature relay 3 operates according to the temperature sensor 1, switches the program regulator 6 to work starting signal, which gives signals to the control starter bus 7. Starter 7 is connected to battery 11 and starts to rotate the engine shaft, starts it, and it inaet progrevats. The time in relay 10 is counted from the moment the engine starts to work according to the signal from engine start sensor 9, and the duration of the time interval formed by relay 10 is determined by the number of starter starts 7 fixed by counter 8, the readings of which determine the duration of the relay 10 of time. 3 il. cl

Description

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The invention relates to mechanical engineering, in particular, engine-building, and specifically to devices for automatic heating of an internal combustion engine of mainly mobile units during periods of their station during the cold season.

The aim of the invention is to increase the efficiency of the device by increasing the reliability of engine starting.

FIG. 1 shows a functional diagram of the device; in fig. 2 shows an embodiment of a software trigger controller; in fig. 3 is an embodiment of a programmable time relay.

The automatic warm-up device contains an engine temperature sensor 1 connected in parallel to two temperature relays 2 and 3. The output of the temperature relay 2 is connected to the first input of the circuit 4, the output of which is connected to the engine stop unit 5, and the output of the temperature relay 3 is connected to the first input of the program start regulator 6, the output of which is connected to the starter control bus 7. To the output of the program regulator the start-up b torus is also connected to the input of the counter 8, the output of which is connected to the second input of the program regulator 6. To the third input of the program regulator 6 start-up an engine start sensor 9 is connected, which is also connected to the first input 10 of the relay time. The second input of the programmable time relay 10 is connected to the counter 8, and the output of the time relay 10 is connected to the second input of the circuit 4. The generator 12 is connected to the starter 7 via the battery 11.

The software start controller 6 (Fig. 2) contains a four-input circuit AND 13 connected at the output to the input of the time relay 14, which at the output is connected to the input of the counter 8, the control bus of the starter 7 and the input of the time relay 15. The inputs of the circuit And 13 is connected to the output of the counter 8, the sensor 9 engine start, relay 3 temperature and the output of the relay 15 time.

The programmable time relay 10 (Fig. 3) consists of a multivibrator 16 connected at the input to the engine start sensor 9, and at the output through the counter 17 - with a three-input circuit And 18, which is connected to the input of the multivibrator 16, as well as blocks 4 and 8 .

As the sensor 1 of the engine temperature, it is advisable to use the standard sensors to the temperature gauges of the engines of automobiles and tractors. f-- The relays 2 and 3 of the temperature of the center should be performed electronically in order to reduce the temperature and weight of the device. Eyes are relay elements that operate when input signals change. The thermistor sensor is usually included in the bridge circuitry together with post resistors at the input of the relay.

The programmable time relay 10 is most advisable to run on typical digital or analog chips.

Multivibrator 16 of the programmable time relay 10 (Fig. 3) generates square-wave oscillations with a period of 10 minutes following, but with a signal from the sensor 9 for starting the engine, i.e. only at work

engine The oscillations from the multivibrator 16 are sent to the counter 17. The latter is connected to the three-input circuit And 18, which also works only when there is a signal from the sensor 9 for starting the engine. The circuit And 18 is connected to the counter 8, which records

number of starter starts 7.

As the engine start sensor 9, a regular alternator of the electrical equipment system can be used, which is equipped with an additional rectifier unit. At the output of the additional voltage, voltage appears only when the engine is running, so this device can use it as an engine start sensor 9. Thus, the voltage at the output of the optional generator rectifier unit can be used to prohibit the operation of the start-up software controller 6 and to activate the programmable relay 10 in time.

As a block 5 engine stop

0 can be used for diesel engines solenoid valves for stopping the engine fuel, and for carburetor engines for both fuel shutoff valves and relays that switch off the ignition circuits. To provide work

5 valves or relays with circuit 4 in block 5 can be used with intermediate power amplifiers, such as electromagnetic relays.

The device operates as follows.

When the unit is parked during the inter-shift period during the cold season, the engine temperature decreases, and the parameters of the engine temperature sensor I also change accordingly, which triggers the temperature relay 3, which includes the start-up program controller 6 in operation.

The controller 6, in accordance with the program embedded in it, issues commands to the control starter 7. The engine starts, the engine start sensor 9 outputs a signal to prohibit the input of the software start controller 6, and the latter stops issuing commands to the starter control bus 7.

When the engine is running, generator 12 charges battery II.

 During engine operation, the engine warms up and, accordingly, the parameters of the engine temperature sensor I change. In this case, the temperature relay 3 initially switches off and then, at a given temperature, the temperature relay 2 is triggered, which forms at the input of circuit AND 4 a signal that the engine has reached the set temperature and can be stopped. However, issuing by AND circuit 4 commands to the engine stop unit 5 is performed in this case only with an enable signal from the programmable time relay 10. The time in relay 10 is counted from the moment the engine starts to operate according to the signal from engine start sensor 9, and the duration of the time interval formed by programmable time relay 10 is determined by the number of starter starts 7. The number of starter starts 7 is recorded at start by a counter 8, whose readings are determined The duration of the time delay of the programmable time relay 10 is set. Counter 8 is required in the device both to limit the number of starter starts during an emergency engine start in order to prevent the unacceptable discharge of the battery I, and to estimate the required duration of the charge of battery II, i.e. engine work. After starting the engine, the programmable time relay 10 starts from the signal of the engine start sensor 9 and starts counting the time interval during which the output signal from the programmable time relay 10 prohibits the operation of the AND 4 circuit, and, as a result, the engine is not allowed to stop even to a given temperature, i.e. Relay 2 temperature worked. The dwell interval of the programmable time relay 10 is formed in accordance with the readings of counter 8, i.e. with the number of starter inclusions, which characterizes the degree of discharge of the battery And and the time required for its charge. After counting, the programmable relay 10 of the interval time in accordance with the readings of counter 8 at its output appears a signal permitting the operation of circuit AND 4. If there is already a signal from temperature relay 2 at the first input of circuit 4, signaling sufficient heating the engine, the circuit AND 4 is triggered and the engine stop unit 5 is put into operation. The engine stops and its temperature starts to decrease gradually, the parameters of the engine temperature sensor I change accordingly, which causes the temperature switch off-relay 2 and, as a result, AND 4 circuits. At the same time, the command from the engine stop unit 5 is removed and the latter is ready to the new inclusion. With a further decrease in the temperature of the engine, the temperature switch 3 is triggered according to the temperature sensor I readout. The temperature switch 3 activates the start-up software controller 6, which outputs signals to the starter control bus 7. The latter is connected to battery II and begins to rotate the engine shaft. The engine starts to work, at the same time it warms up and further the processes of stopping and starting the engine are repeated. The software start controller 6 switches on the starter for a certain period of time. In the event that the engine does not start, software controller 6 provides breaks of a predetermined duration between starter turns 7 in order to restore battery performance 11. Time relay 14 determines the duration of the start of the engine starter, and time relay 15 forms intervals between time relay 14, t. e. starter 7, due to the fact that when the time relay 15 is turned on, the signal of its output inhibits through the AND 13 circuit the time relay 14 is turned on. When the power is turned on and the engine is not running, the And 13 circuit receives signals from the counter 8, the start sensor 9 and the time relay 15, which allow the start program regulator 6 to work. However, the software controller does not work if the temperature relay 3 does not work, indicating that the engine has cooled below the set temperature. If the temperature relay 3 has worked, then all the enabling signals are present at the input of circuit AND 13. This causes the AND circuit 13 to operate and turn on the time relay 14, which in turn turns on the starter 7. The engine shaft begins to rotate. If the engine did not start during the time the relay was turned on 14 times, i.e. the starter 7, then after turning off the relay 15 time through the scheme And 13 it prepares to re-enable the relay 14 time. After the end of the exposure time relay 15, the AND 13 circuit is again switched on and then the time relay 14, i.e. starter 7. Each switch-on of time relay 14 is summed by counter 8, which, fixing six starts of starter 7, forms a signal at the input of the AND 13 circuit that prohibits the operation of time relay 14, i.e. the start of the starter 7 is stopped and the emergency duty signal is given to the staff on duty,; In the case of starting the engine when the starter 7 is turned on, the signal from the engine start sensor 9 prohibits the operation of the start control software b through the circuit 13 and thus turns on the starter 7 immediately. At the end of the engine after warming up and charging the battery 11, the engine start sensor 9 sets the counter 8 to the initial

Claims (1)

Claim An automatic heating device 10 for an internal combustion engine, comprising an engine temperature sensor, a first and second temperature switch, an engine start sensor, a program start controller with three inputs, a two-output counter, an engine shutdown unit, and a generator, a battery and a starter with a control bus connected in series 15, wherein the motor temperature sensor output is connected to inputs of the first and second temperature switch, the outputs of which are connected respectively to the input _of governmental stopping the engine block and the first the input of the program start controller, the engine start sensor with its output is connected to the second input of the program controller, the output of the latter is connected to the control bus of the starter and through a counter 25 with its first input, characterized in that, in order to increase the efficiency. by increasing the reliability of starting the engine, it additionally contains a programmable time relay with two inputs connected in series and a two-input circuit I, the second input of the last connected to the output of the first temperature switch, and the circuit output to the engine shutdown unit, the first input of the programmable time relay with the output of the engine start sensor, and the second input is 35 with the output of the counter. Fig g Fig!