2.2.1.4. Features of system of electronic control by injection of fuel and ignition


Fig. 53. Electric circuit of a control system of engines 420.10-10 and 4213.10


The electric schematic diagram of system of electronic control is provided by the engine on fig. 53.
The following components are a part of a control system:
– control unit of the engine;
– sensors;
– executive electromechanisms;
– control (diagnostic) lamp of malfunction;
– plait of wires;
– the socket is diagnostic.

Control unit of the engine
On the car the control unit of the MIKAS-7.2 engine or "is installed by M1.5.4. At ABTPOH".
The control unit is the multimode cyclic automatic machine with the branched program of registration - information processing and controls of engine electromechanisms.
The block is installed in interior of the car from the passenger's seat, on the right on a sidewall under the decorative panel. The block is connected to a plait of wires of a control system by means of the 55-contact socket which is attached to the block case by means of the lever bracket.
Takes an electronic control unit basic signals from the sensor of provision of a bent shaft. Lack of two teeths (two basic impulses) on a disk of synchronization allows to synchronize the top dead point (TDP) of the first and fourth cylinders. On the basis of the calculated values of frequency of rotation and loading (a mass consumption of air) the electronic control unit realizes sparking in the corresponding cylinder. Using information on tension in onboard network of the car, the electronic block corrects time of accumulation of energy of coils of ignition (time of the connected condition of primary winding of the coil of ignition to the power supply) for full sparking. The control unit of service does not demand.

Sensors
 Sensor of provision of a bent shaft (frequency sensor) of the inductive DG-6 0261210113 type (BOSCH, Germany) or its analog.
The sensor works together with the synchronization disk having 60 teeths, two of which are removed. Prosechka of teeths is a phase mark of provision of a bent shaft of the engine: the beginning of the 20th tooth of a disk corresponds to VMT of the first or fourth cylinders of the engine (teeths are reckoned after a prosechka on the course of rotation of a bent shaft).
The sensor serves for synchronization of phases of control of system electromechanisms with phases of operation of the mechanism of gas distribution of the engine. It marks each turn of a bent shaft on equal angular marks (3 °) that allows to calculate phases of injection and corners of an advancing of ignition, and also a working point of engine management on the frequency of rotation of a bent shaft.
The sensor is installed in a forward part of the engine on the right on a flange of a cover of gear wheels of the camshaft. The nominal gap between an end face of the sensor and tooth of a disk of synchronization has to be 0,5–1,2 mm. The sensor is connected to a plait of wires by means of a three-contact block with a latch.
 The sensor of position of the camshaft (the phase sensor) PG-3.1 0232103006 (BOSCH, Germany) or its analog is the integrated sensor on the basis of Hall's effect (magneto-resistive effect) with the built-in amplifier shaper of a signal.
The sensor works together with a camshaft pin-otmetchikom: the pin-otmetchik is pressed in a camshaft gear wheel.
The sensor serves for definition of phase VMT of the first cylinder, i.e. it allows to define the beginning of the next cycle of rotation of a bent shaft of the engine.
The sensor is installed in a forward part of the engine at the left on a cover of gear wheels of the camshaft. The nominal gap between an end face of the sensor and a pin-otmetchikom has to be 0,5–1,2 mm. The sensor is connected to a plait of wires by means of a three-contact block with a latch.
 The sensor of a consumption of HLM2-4.7 0280212022 air (BOSCH, Germany) or its analog is the integrated sensor of termoanemometrichesky type with the built-in measuring scheme and the amplifier of a signal. The sensitive element of the sensor is executed in the form of the platinum heated thread. For purification of thread of dirt (after switching off of the engine) it is burned by an impulse of current 40 мА, the sent control unit within 1 second (tarirovochny burned the sensor).
The sensor allows to determine the mass of the air which is sucked in by the engine and to calculate a working point of management on cyclic filling of cylinders of air.
It fastens on the one hand to the throttle device, with another – to the air filter by means of rubber branch pipes and collars. At installation of the sensor it is necessary to observe its orientation: the arrow represented on the sensor case has to coincide with the direction of an air stream to the engine. The sensor is connected to a plait of wires of the control unit by means of a six-contact block with a latch.
On the sensor the potentiometer of adjustment of contents WITH in the fulfilled engine gases is established.
 The sensor of provision of a butterfly valve DKG-1 0280122001 (BOSCH, Germany) or its analog serves for definition of degree and speed of opening of a butterfly valve.
The sensor represents a potentiometer with the slip ring moving on the radius of conducting sector 0-100 °. Output resistance of a potentiometer changes depending on the size of opening of a butterfly valve. Power supply of the sensor is carried out with a stabilized voltage of (5+0,2) B from the control unit.
The sensor is installed on the throttle device from above and fastens to it two screws. The axis of the throttle device has the focusing lyska which at installation of the sensor is combined with shliyets on a collet clip of an axis of the sensor, connection of axes is condensed with a rubber ring. The sensor is connected to a plait of wires by a three-contact block with a latch.
 Sensors of temperature of cooling liquid and the soaked-up air 19.3828 serve for control of a thermal condition of the engine.
The sensor of temperature represents a semiconductor stabilitron which has the return inclusion and is powered by direct working current of +5 V from the control unit. The output tension of the sensor changes depending on ambient temperature.
Sensors are screwed in carving nests:
– the air temperature sensor – on an engine receiver (at the left);
– the sensor of temperature of cooling liquid – on a pump housing of cooling liquid of the engine (ahead). Connections are condensed with sealant.
Sensors are connected to a plait of wires by two-contact blocks with latches.
 KS 0261231046 detonation sensor (BOSCH, Germany) or its analog of piezoelectric type serves for definition of a detonation of the engine and allows the control unit to correct an ignition advancing corner for elimination of a detonation.
The sensor is installed on the engine from above on the right between the second and third cylinders and is connected to a plait of wires by means of a two-contact block with a latch.
 The sensor of pressure of fuel 23.3829 or its analog of membrane type with the built-in rheostat which resistance changes depending on fuel pressure.
The sensor serves for determination of absolute pressure of fuel in a fuel stage and can be installed as an element of an additional complete set on the filter of thin purification of fuel.
The sensor is connected to a plait of wires by a round tip and screw connection.
 The oxygen sensor (or a lambda probe) LSH-15 0258003234 (BOSCH, Germany) or its analog is an element of an anti-toxic complete set of the car.
Serves for indication of a condition of fuel-air mix at the level of stoichiometric structure at which the coefficient of excess of air is approximately equal 1,0 that allows the control unit to provide optimum conditions for work of converter of the fulfilled gases. The sensor represents the warmed diffusive electrochemical probe consisting of solid electrolyte on the basis of dioxide of zirconium (ZnO2). The probe develops an electric signal about 0,8-1,0 In at the lowered concentration of oxygen in the fulfilled gases (rich mix) and 0,2-0,4 B at the increased concentration of oxygen (poor mix). The sensor has the metal case with a carving of M14x1,5 and a turnkey nut of S22 and the punched protective tip for the diffusive probe.
The sensor is installed in system of production of the fulfilled engine gases on a reception pipe of the muffler before converter. For basic (without converter) the cap is established to a complete set of a control system of the engine to the place of the sensor of oxygen.
The sensor is connected to a plait of wires by means of a series 6,3 nest (an alarm wire) and a two-contact block with a latch (a chain of a pozistorny heater of the sensor).

Executive electromechanisms
 Fuel nozzles of EV1.3C 0280150902 (BOSCH, Germany) or their analogs.
The nozzle represents the precision hydraulic valve with the drive from a high-speed electromagnet and is intended for dispensing and thin dispersion of fuel towards the inlet valve of the cylinder of the engine. With a constant relative pressure of fuel in the highway about 300 kPa and nozzle electromagnet supply voltage the volume of the dosed fuel is proportional to duration of the operating impulse of inclusion of a nozzle.
Nozzles are established from above on the right side on the engine, in special saddles openings of a receiver and nestle from above a fuel stage through sealing rubber rings. Each nozzle is connected to a plait of wires by means of the two-contact block having a special cylindrical groove and latches.
 The Regulator of Additional Air (RAA) (the idling regulator) ZWD-3 0280140505 (BOSCH, Germany) or its analog represents the dvukhobmotochny rotary solenoid with a slot-hole opening through passage which section changes according to the program of the control unit.
At interaction of constant magnetic field of a rotor of the regulator with variation magnetic field of the stator which is formed by impulses of management of various porosity with a frequency of 125 Hz the rotor together with the valve turns on the set corner and changes the section of the roundabout channel through passage via which the soaked-up air gets to zadrosselny space, passing a butterfly valve.
The regulator fastens to an engine receiver through the rubber-metal holder. To the output union of the regulator the rubber hose from a receiver, and is brought to the entrance union – a rubber hose from the side union of the throttle device. All connections of hoses are condensed with collars. The regulator is connected to a plait of wires by means of a three-contact block with a latch.
 The electric fuel pump EKP-3 0580464038 (BOSCH, Germany) or its analog serves for creation of pressure in the fuel highway. It consists of the following elements: the electric motor of a direct current, the pump of kolovratny type with working bodies in the form of rollers, the case with inlet and final unions, two plugs for connection of supply voltage, the return and safety valves.
The electric motor of the pump is cooled with the passing fuel stream therefore in order to avoid its failure it is not allowed to turn on the pump in the absence of fuel in highways or in tanks more than for two minutes.
The safety valve limits fuel pressure in the highway after the pump to the level of 580 kPa.
The backpressure valve interferes with leak of fuel from the highway in a tank via the idle pump at the elevated pressure of fuel.
Giving of the pump is calculated so that at a voltage of power supply of 6 V fuel pressure in the highway of not less standard (300 kPa) at launch of the engine and its work was provided idling.
The pump is installed on the left longeron of a frame and is connected by one rubber hose to the filter settler, and the second – to the filter of thin purification of fuel located under a cowl. The pump turns on from the pump relay which works on signals from the control unit.
The pump is connected to a plait of wires according to the specified polarity by means of round tips: a carving hairpin of M4 – the + plug" and a carving hairpin of M5 – the plug"" (a wire of mass of the pump).
 The relay main 90.3747-10 or its analog – the electromagnetic relay of a direct current with normally opened contacts.
The main relay turns on the control unit and is intended for giving of tension on all basic elements of system of electronic control by the engine.
The power chain of the main relay going from the accumulator is protected from short circuits on "weight" by the cordlike PR14.3722 fuse on 25 A. At the same time the chain of ignition of a control system is protected from short circuits on "weight" by the cordlike PR119-B-0,1 fuse on 10 A. Safety locks have a folding design for replacement of a fusible insert.
The main relay is installed on a front board over the engine, near the relay of the fuel pump. The relay is connected to a plait of wires by means of a four-contact block.
Cordlike safety locks are placed:
25 And – under a cowl, near the rechargeable battery;
10 And – under the dashboard from the passenger's seat.
 The relay of the fuel pump 90.3747-10 or its analog – the electromagnetic relay of a direct current with normally opened contacts.
The relay turns on the control unit and is intended for giving of tension on the fuel pump.
The relay is installed on a front board over the engine, near the main relay of a control system and the relay of inclusion of the starter (involving the relay). The relay is connected to a plait of wires by means of a four-contact block.
 Ignition coils two-output 3012.3705 or their analogs serve for formation of high-voltage impulses of ignition in the first or fourth and second or third cylinders.
The coil represents the high-voltage transformer with the closed magnetic conductor, primary and secondary windings of which are electrically not connected among themselves. On a design the coil dry, i.e. not oil-filled, also includes a magnetic conductor with windings, two plugs for connection of a chain of management and two isolated nests for connection of high-voltage wires. In a magnetic conductor four openings under the screw or a bolt of M5 for fastening of the coil are executed.
Coils of ignition are installed on an engine block head cover on the general arm. The low-voltage winding of the coil is connected to a plait of wires by two single nests of a series 6,3, and high-voltage wires are connected to a secondary winding of the coil through two special isolated nests. The wire of control of the coil of ignition of the first and fourth cylinders has the special tag (put with paint).

Control lamp of malfunction of the engine
The lamp of malfunction signals about malfunctions of a control system of the engine.
It is established on the car dashboard as a part of a combination of devices in the form of a symbol of yellow color with the image of a contour of the engine. The lamp is connected to a plait of wires under the dashboard two nested clips of a series 6,3.

Plait of wires
The plait of a control system of the engine is intended for electric connection among themselves of components of a control system of the engine and connections of system to onboard electric equipment.

The socket is diagnostic
The socket serves for connection of means of the automated external diagnostics and programming of a control system of the engine.
The socket is installed under a cowl (over the engine) on a board of a front and is closed by a protective cover.