Kia Sportage>>
Systems of electric equipment of the engine>>
System of simplification of cold start of the diesel engine
System of simplification of cold start of the diesel engine
General information
For achievement of necessary temperature of ignition compressed in cylinders of the cold engine of an air and fuel mix the system of simplification of cold start is used.
The special candle consisting of the case with vpressovanny in it by a heating core is rolled in the chamber of combustion of each of cylinders, created by two spirals: heating and adjusting. After tension giving the heating spiral in a core heats up within several seconds to temperature + 850°С, thus a current, passed through a candle reaches 30 Ampere-second increase in extent of warming up increases and resistance filched that promotes decrease in a current to 15-25 A.Po's value shutdown of a control lamp of system of an incandescence on the dashboard it is possible to carry out start the engine.
Time spent for a preliminary warming up of cylinders, makes no more than 12 seconds and is regulated by the special relay and the module of engine management (ECM) receiving information on the current temperature of cooling liquid of the engine through the ECT sensor. On the basis of the analysis of the received data of ECM exercises administration of duration of functioning of system of an incandescence and a working current of heating.
Principle of functioning of system of preheat
Duration of a phase of preheat is determined by temperature of cooling liquid (ECT ® ECM sensor), - the corresponding dependence is presented in the table.
| Temperature of cooling liquid, °C |
130 |
40 |
20 |
0 |
- 25 |
| Time of activation of the relay, with |
1 |
7 |
8 |
10 |
12 |
| Time of activation of a control lamp of preheat, with |
1 |
2 |
3 |
4 |
7 |
Compulsory shutdown of a phase of a preliminary incandescence occurs at engine start after a key povorachivaniye in the situation START.
In a phase of thermoheat it is used residual warmly heating elements of candles after key return from the situation START in the situation OFF in unsuccessful attempt of start of the engine before end of a phase of preheat when the candle relay is activated.
The system passes to a post-heat phase after successful implementation of start. Dependence of functioning of candles of an incandescence in this phase from temperature of cooling liquid is presented in the table.
| Temperature of cooling liquid, °C |
70 |
60 |
50 |
30 |
- 40 |
| Time of activation of the relay, mines |
0 |
1.5 |
4.9 |
8.1 |
8.1 |
Shutdown of post-heat occurs at the termination of admissions of ignition of a working mix, and also on reaching temperature of cooling liquid of value in 70°С. Besides, management of functioning of a phase of post-heat is made on turns of the engine and extent of squeezing of a pedal of gas.
|
|
Parameters of activation of a phase of post-heat depending on engine turns. |
|
|
Parameters of activation of a phase of post-heat depending on extent of squeezing of a pedal of gas. |
|
|
Temperature drop of cooling liquid below value 60°С leads to repeated activation of post-heat. |
Protective shutdown of the relay of candles of an incandescence occurs at excess by tension of the battery of value in 16 In when the engine is not turned.
|
|
When lowering tension is lower 14 In more than for two seconds of the relay again it is activated. Besides, shutdown of candles is made at refusal actually by the relay, and also sensors ECT, CMP and the provision of a pedal of gas. |