7.3. System of preheat - diesel models
Principle of functioning
The individual glow plug is screwed in the vortex camera of each of cylinders of the engine. Candles are warmed in the electric way, facilitating start of the cold engine. Control of giving of power supply on candles is exercised by means of the special relay / timer.
On some models of a glow plug continue to function during even some time after implementation of start of the engine. After the starter is switched off candles pass into the mode of 3-minute functioning on the timer. At the same time within the first 15 seconds the possibility of shutdown of candles is completely excluded. Then giving of food on them can be interrupted under following conditions:
a) Squeezing of the accelerator pedal on the course more than 11 mm and its keeping in the pressed state within more than 2.5 seconds;
b) Registration by the sensor of temperature of cooling liquid of value over 60 °C.
In an instrument guard of the car the special control lamp informing the driver on operation of system of preheat is built in. Switching off of a lamp confirms readiness of the engine for start. Giving of tension on candles is made within several more seconds after switching off of a lamp. If in the allowed time attempts of start of the engine are not made, the timer turns off giving of food in order to avoid an overheat of candles and replanting of the battery.