Block start diesel internal combustion engine

 

(57) Abstract:

Usage: devices for starting diesel engines with glow plugs. The inventive block start diesel engine contains software device 1, the information input which serves as the input unit, the Executive snout 2, contacts 4 which are connected respectively to the input unit serving to connect the battery to the output unit, the oscillator 6 and the logical circuit 5 controls. In addition, the unit can be equipped with logic OR 12, the inputs of which are connected respectively to the bus power supply and to the output unit, and the output of the logic circuit OR connected to the power bus logic circuit 5 controls. Unit start diesel engine contact the Executive relay mounted on a flat spring which is mechanically connected with the armature of the actuating relay and disturbing frequency equal to or multiple of the resonance frequency of the mechanical vibrations of the moving system of the actuating relay. 3 C.p. f-crystals, 4 Il.

The invention relates to electrical equipment for internal combustion engines, in particular to devices of starting a diesel engine.

The known device p is d Executive relay control current through the glow plug of a diesel engine for the particular program.

It is known a device in which the software device includes first first actuating relay that his contact delivers the maximum current to the glow plugs for quick warm up, and then after a certain period of time includes a second actuating relay, providing a decrease of current through the candle, so as to maintain the temperature of the candles at the specified level [1].

A device in which the software device support, through the Executive relay the temperature of the glow plugs, changing the duration of the switching relays in the signal of the temperature sensor [2].

In the ignition system software, the device maintains the temperature of the glow plugs, controlling the resistance of the glow plugs [3].

The disadvantages of these devices are that they do not provide sufficient reliability of the ignition system due to the low reliability of the actuating relay contacts which switch the significant currents (hundreds of amperes).

Also known device of starting a diesel engine containing the device that controls the contactless Executive unit floor the TCI devices with contactless devices are existing proximity switches when the currents 200-300 And have a voltage drop of about 1.5-2.0 V, i.e., contactless switch dissipates power 300-600 watts. This leads to difficulties associated with heat dissipation and reduces the efficiency of the use of such elements. Furthermore, in such devices it is necessary to apply special measures for the protection of the proximity switches from their failure in the event of a short circuit in the candle or lead wires. All this increases the cost of the equipment.

Closest to the invention is the block start diesel engine, which device contains the device with the actuating relay output [5] . Software device generates a signal for switching on the output relay activation time which depends on the temperature of engine coolant. Contact the Executive relay included in the circuit of the glow plugs.

Such a block circuit diagram of the start-up of the diesel engine is quite simple and economical. However, it is possible to "lock" (welding) of Executive contacts of the relay, causing the current in the circuit of the spark plug is not interrupted, which can lead to their failure. Maksimalno current candle is overheating and may break down, moreover, fragments of candles can get into the engine, which will lead to its failure. The battery of the car also withstand a load current of 200-300 But only in the short mode, in case of sticking of the relay contacts of the battery can be damaged. At the same time, due to the high current connection elements of the ignition system (battery, spark plug, contact the Executive relay) are made so that these circuits are not disabled by the key "START" (key starter). Therefore, in case of failure of the relay driver must open circuit candles, for example, by disconnecting the battery terminals that execute quickly is not possible. Therefore, the task of improving the reliability of block start diesel engine is very important.

The aim of the invention is to increase the reliability of block start diesel engine.

This is achieved by the fact that the block start diesel engine, containing a programming device, the information input by the information input unit, the output relay, the contacts of which are connected respectively to the input unit serving to connect the battery, and the output unit, the effect of the actuating relay, moreover, the input means of the modulation control signal actuating relay connected to the output unit, the output means of the modulation control signal actuating relay connected to the first input of the logical control circuit actuating relay, a second input which is connected to the release device, the output logical control circuit actuating relay is connected to the winding of the actuating relay.

In addition, the control unit starting a diesel engine can be equipped with logic OR, the inputs of which are connected respectively to the bus power supply and to the output unit, and the output of the logic circuit OR connected to the power bus logic control circuit of the actuating relay.

In the control unit start diesel engine movable contact actuating relay mounted on a flat spring which is mechanically connected with the armature of the actuating relay.

In the control unit starting a diesel engine, the frequency of the output signal means of the modulation control signal actuating relay is equal to or multiple of the resonance frequency of the mechanical oscillatory system movable part of the actuating relay.

In Fig. 1 shows the scheme proposal is asego the unit; in Fig. 3 - possible variant implementations of the logical control circuit actuating relay; Fig. 4 - possible embodiment of the means of the modulation control signal actuating relay.

Block start diesel engine contains software device 1, the actuating relay 2 coil 3 and the contact 4, the logical circuit 5 controls the output relay, means 6 modulation control signal actuating relay, information input 7 block 8 pin - side network power, contact, 9 - bus power supply, the contact 10 output unit, the contact 11 (General). In one embodiment, the execution unit may be provided with logic OR 12.

For the operation of the unit to the electrical system of the vehicle connect the ignition key (key START) 13 connected between the contacts 8 and 9 of the unit, the battery 14 connected between pins 8 and 11 of block, spark plug 15, is connected between pins 10 and 11 of the unit and the temperature sensor 16 connected between pins 7 and 11 of the block. Information input 17 software device 1 is connected with the information input 7 of the block. The power bus 18 and 19 software device 1 are connected respectively with the contacts 9 and 11 of the block. O the 23 means 6. Input 24 means 6 is connected with pin 10 of the block, the power bus 25 means 6 is connected to the contact 11 of the block.

The output 26 of the logical circuit 5 is connected to the winding 3 of relay 2, the second output winding 3 is connected to pin 8 of the block. Contact 4 Executive relay 2 is connected between pins 8 and 10 of the block.

Power bus 27 ("General") of the logical circuit 5 connected to pin 11 of the block. The composition of the logic circuit 5 may include a self-contained power source (dry battery, a miniature battery) connected to the power rails 27 and 28. In one embodiment, execution unit power bus 28 logic circuit 5 may be connected to the output of the logic circuit 12, the inputs which in this embodiment are connected respectively to terminals 9 and 10 of block.

Software device 1 can be performed by one of the known schemes, forming an output signal the duration of which is a function of two parameters - input voltage 18 software device 1 and the temperature of the engine coolant (resistance temperature sensor 16 connected to the information input 17 software device 1).

Software device 1 may perform other functions (switching on of the heating on the sanitary operation of the starter, and so on).

Relay (see Fig.2,a) contains a coil with a core 29 of magnetic material, the armature 30 of magnetic material, which can be rotated around a support 31 and a return spring 32. The anchor 30 is fixed to the plate 33, in the form of flat steel or bronze spring, at the end of the fixed contact 34. The second pin 35 fixed to the stationary rack 36.

Logic circuit 5 controls the actuating relay contains logic elements NOT 37,38, logical-OR-NO 39, resistors 40-43, transistors 44,45.

The input of logic element 37 is connected to the input 21 of the logical circuit 5 and through a resistor 40 from the power bus. The input of logic element 38 is connected to the input 22 of the logical circuit 5 and through a resistor 41 with the power bus. The outputs of logic elements 37, 38 are connected respectively with the first and second input logic gate 39, the output of which through a resistor 42 is connected to the base of transistor 44. The emitter of transistor 44 is connected to the base of transistor 45 and through a resistor 43 - bus "General", is connected to the emitter of transistor 45. The collectors of transistors 44, 45 are United and connected to the output logic circuit 26 5.

Supply circuit logic elements 37-39 the management Executive of the relay may be made in the form of a self-oscillating oscillator, for example, in the form of a multivibrator (see Fig.4). Bus self-oscillating power generator connected respectively to the contacts 24 and 25 means 6, and the output of the astable oscillator serves as the output means 23 6.

As logic circuits OR 12 (see Fig.1) can be used standard diode circuit OR.

Wiring the unit into the electrical system of the vehicle shown in Fig.1. When the ignition key 13 in the position "Ignition" of its contacts are closed and the voltage from the battery 14 through the key 13, the terminal 9 is fed to the input 18 of the software of the device 1. Input 17 software device 1 receives the signal from the temperature sensor 16. Software device 1 produces at the output 20 of the logical signal "1", the duration of which depends on the temperature signal from sensor 16) and battery voltage. This logic signal is fed to the input 21 of the logic circuit 5, which output signal at pin 26 includes Executive relay 2. Contact 4 relay 2 is closed and the voltage from the battery 14 through the pin 8, pin 4, pin 10 goes to the spark plug 15 of the engine. Candles warmed up, and then starts the signal l is iscrucial engine, who runs. After a certain period of time, a programming device 1 generates at the output 20 of the signal "0" which is fed to the input 21 of the logical circuit 5. Logic circuit 5, the output signal at the output 26 turns off relay 2, contact 4 which is opened, the current through the spark plug 15 is terminated.

In that case, if after receipt of a signal on relay off (signal "0" at the output 20 software device 1) pin 4 will not open (due to sintering of his contacts), the unit operates as follows. Input means 24 6 since the closure of the contact 4 has a voltage equal to the voltage of the battery 14. Therefore, the oscillator means 6 is raised and the output means 23 6 has a signal in the form of a rectangular periodically recurring pulses which is fed to the input 22 of the logical circuit 5. As long as the input 21 of the logical circuit 5 includes a signal "1" (relay included) pulse signal input 22 is not transmitted to the output 26 of the logic circuit 5. Once at the entrance 21 of the logical circuit 5, a signal will appear to "0" (relay 2 is off) pulse signal input 22 output 26 of the logic circuit 5 and modulates the control signal actuating relay 2. Modulation bignoodletitling signal at the output 26 of the logical circuit 5 becomes zero, the scheme comes in its original state until the next cycle start the engine.

The described algorithm corresponds to the embodiment of the block in which the logical circuit 5 is powered by a standalone power source. In that case, when you arrange the execution of the block with a logical block diagram 12 operates as follows. Logic circuit 5 receives power from the battery 14 through the key 13, the contact 9 of the block, the first input of logic circuit OR 12, the output of the logic circuit 12, the contact 28 of the logical circuit 5. After turning off the key 13, if the contact 4 of the relay is not opened, the logic circuit 5 continues to be powered by the circuit of the rechargeable battery 14, the pin 8 of the block, the contact 4 of the relay, a second input of the logic circuit 12, the output of the logic circuit 12, the contact 28 of the logical circuit 5. This provides the power for the logic circuit 5 after turning off the power supply unit (after contact opening 13) on all the time, until you open the contact 4 of the relay.

The process of forced disconnection of contacts 4 of relay 2 is as follows (see Fig.1 and 2). Considering the case when the relay contacts are not opened after turning off the current in the relay coil. In this case, the logic circuit 5 expressed parts of the relay selected so at the moment of closing of the contacts 34, 35 between the core 29 and anchor 30 there was an air gap (see Fig. 2, b). Therefore, after receiving the current in the relay coil, the armature 30 is attracted to the core 29, a flat spring 33 bends (see Fig.2) and contacts 34,35 result of the bending of the flat spring occurs shear force directed along these contacts tending to move the contact 34 relative to the contact 35. After turning off the current control anchor 30 under the influence of return spring 32 is rotated around the support 31, the spring 33 is bent in the opposite direction relative to the previous state (see Fig.2, C and d). When this occurs shear force acting along the springs 33 and directed in the opposite direction relative to the previous state. Repeated exposure to the relay coil modulated signal leads to the repeated occurrence of the cases considered in Fig. 2, in that, ultimately shifting the power shifts the contact 34 relative to the contact 35, while Microware destroyed, and the surfaces of the contacts 34 and 35 samozachowawcze due to friction together. Thus, the modulated signal to the relay coil leads to prinuditelnaya oscillatory system, including the anchor 30 fixed at one end on a support 31, a spring 33, one end of the fixed anchor and the other on the welded contact 34 to the contact 35. If you choose the frequency of the modulation signal control relay is equal to or a multiple of the natural frequency of mechanical oscillations of the moving system of the relay, the amplitude of oscillation of the moving system will increase significantly when exposed to a modulated signal in comparison with the normal travel of the movable system. This will lead to increased forces acting on the contacts 34, 35. This increases the probability of failure microwelding contacts and increases the reliability of the relay.

Logic circuit 5 controls the output relay operates as follows. When the input 21 of the logical signal "1" to enable the Executive relay this signal is fed to the input of a logic gate 37, the output of which is formed a signal "0". This signal "0" is fed to the input of a logic gate 39, the output of which a signal "1" regardless of the output signal of the logic element 38 ("0" or "1"). This signal "1" opens the transistors 44, 45, which corresponds to the enabled state of the output relay.

After the end of the cycle rawhide 21 logic circuit 5 a signal "0", which output logic element 37 in the form of a signal "1" is supplied to the first input of logic element 39. If the input 22 of the signal "0" (which corresponds to the signal "1" at the output of logic element 38) to the inputs of the logic element 39 has two signal "1", the output of the logical element is formed by a signal "0", the transistors 44, 45 are closed, which corresponds to the off state of the output relay.

In that case, if the relay contacts are not opened as a result of their joining, then the input means 24 6 (see Fig.1 and 3) operates in a voltage equal to the voltage at the input 8 of the block. Consequently, at the output means 23 6 receive a sequence of rectangular pulses, i.e., the signal on the input 22 of the logical circuit 5 is changed periodically from "0" to "1" and Vice versa. With the same frequency changing signal at the output of logic element 39, respectively, are periodically closed and opened transistors 44, 45, which leads to a modulation control signal actuating relay at the output 26 of the logic circuit 5. After opening the relay contacts, the voltage at the input means 24 6 disappears, the modulation control signal actuating relay stops.

Tool 6 modulation of the th power of this device, the second power bus (common) is connected to the contact means 25 6. When the input means 24 6 voltage oscillator is excited at its output a signal as a series of rectangular pulses which are fed to the output means 23 6. After the disappearance of the voltage at the input 24 of the self-oscillations are thwarted, the signal at the output means 23 6 stops.

The advantages of the proposed unit are as follows. The availability of funds modulation control signal, and a logic control circuit of the actuating relay allowed to exercise control and automatic forced disconnection of contacts actuating relay in case of welding, "sticking". This increases the reliability of the unit.

The proposed execution of the block in combination with the proposed design of the moving system of the actuating relay also increases the reliability of operation of the relay due to shear forces acting on the welded relay contacts during the modulation signal control relay.

The use of the modulation signal with a frequency equal to or a multiple of the natural frequency of mechanical oscillations of the moving system relay, allows to increase the pullout force when the lock.

In practice, was implemented block on the proposed scheme and made the relay, the contacts of which were made of red copper uncoated precious metals, as is usually done to improve the reliability of the relay. When testing via relay was passed a current of about 300 A. After 15000 switching relay operable, and the relay contacts remained without visible damage (Podgorny).

1. BLOCK START DIESEL INTERNAL COMBUSTION ENGINE, containing a programming device connected to the bus power supply and having an information input, an information input unit, the output relay, the contact of which is connected between the input of the unit for connecting the battery and the output unit, characterized in that it is equipped with an oscillator and a logic control circuit of the actuating relay with two inputs, one of which is connected to the output of the oscillator, and the other to the release device, and the output of the logic control circuit connected to the winding of the actuating relay, and the input of the oscillator with the output of the block.

2. The block under item 1, characterized in that it further provided with a logic circuit OR the input of which is connected somepointer relay.

3. The block under item 1, characterized in that the movable contact actuating relay mounted on a flat spring that is located with the opportunity to interact with the anchor Executive relay.

4. The block under item 3, characterized in that the oscillator is made to output frequency equal to or multiple of the resonance frequency of the mechanical vibrations of the moving system of the actuating relay.

 

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