2.6.1. Design of system of ignition

Fig. 2.262. Schematic and assembly diagram: 1 – ignition switch; 2 – main relay; 3 – coil of ignition of spark plugs No. 1 and No. 4; 4 – coil of ignition of spark plugs No. 2 and No. 3; 5 – sensor of provision of a cam-shaft; 6 – sensor of position of the crankshaft; 7 – ignition No. 1 candle; 8 – ignition No. 2 candle; 9 – ignition No. 3 candle; 10 – ignition No. 4 candle; 11 – a signal from the sensor (pressure sensor in an inlet collector, the eats sensor, the air temperature sensor on an admission, the sensor of provision of a butterfly valve, the detonation sensor (if is available), the car speed sensor, the sensor of position of the lever of the selector of the mode of the movement, a signal of electric loading, a signal of start of the engine, a diagnostic conclusion (the car without indicator lamp of an immobilizator)); 12 – electronic control unit

Fig. 2.263. Arrangement of elements of system of ignition: 1 – electronic control unit; 2 – coil of ignition of spark plugs No. 1 and No. 4; 3 – coil of ignition of spark plugs No. 2 and No. 3; 4 – sensor of provision of a cam-shaft; 5 – sensor of position of the crankshaft; 6 – the sensor of absolute pressure in an inlet collector; 7 – eats sensor; 8 – the air temperature sensor on an admission; 9 – sensor of provision of a butterfly valve; 10 – car speed sensor; 11 – transmission range switch (automatic transmission); 12 – high-voltage wires; 13 – diagnostic socket; 14 – the detonation sensor (if is available); 15 – communication channel socket

System of ignition electronic without distributor. It consists of the elements described below and has an electronic control system.

Determines power setting and traffic conditions of the car by signals from sensors, counts the most suitable value of a corner of an advancing of ignition and duration of an electric impulse in primary winding of the coil of ignition and sends a signal to igniter (the power cascade) of the ignition coil.

The coil of ignition has the built-in igniter which includes and disconnects current in primary winding of the coil according to a signal of an electronic control unit. When electric current in primary winding is switched off, the impulse of high voltage is generated in a secondary winding of the coil.

Using signals from these sensors, the electronic control unit identifies the cylinder which piston is in a compression step, defines an angle of rotation of a bent shaft and automatically regulates initial installation of a corner of an advancing of ignition.

Though this system of ignition has no distributor, two coils of ignition are its part (one – for spark plugs of the first and fourth cylinders and another – for spark plugs of the second and third cylinders. When the signal of ignition comes on to ignite coils of ignition of the first and fourth cylinders from an electronic control unit, in a secondary winding the high voltage which is transferred on high-voltage wires is generated and at the same time puts spark plugs of the first and fourth cylinders in action. Similarly, when the operating signal comes to igniter of other coil of ignition, spark plugs of the second and third cylinders at the same time give the spark category.

Signs of malfunctions of system of ignition and their detection see in table 2.3.