Tianjin Lovol individual pump engine adopts the
Huber EGR valve electric control
system, it will be explained as follows.
The work principle, dismantlement and notices of EGR induction system
I. EGR (Exhaust Gas Recirculation) working principle
1. EGR working principle
ECU controls the electromagnetic valve to open the EGR valve at a appropriate time according to rotational speed,
loading and outlet water temperature of the engine. Small amount of exhaust gas enters induction system through
EGR valve where exhaust gas mixes with fresh air and then enters into cylinder for combustion. That small amount
of exhaust gas enters cylinder as mixed gas for combustion not only can reduce the total amount of exhausted gas but
also reduce the content of NOx in exhaust gas. It is known that NOx is generated under high temperature and
enriched oxygen,, thus EGR may inhibit the generation of NOXx and furthermore reduce the content of NOx in
exhausted gas. However, excess exhausted gas in mixed gas for combustion also can affect the ignition characteristics
of mixed gas and thus affect the dynamic performance of engine, especially when the engine is in idle or low speed
and in low temperature, thus the recycling exhausted gas may apparently affect the performance of the engine. So,
under above condition, ECU control can prevent exhausted gas from recycling and thus avoid the performance of
engine being affected. But when the engine’s speed is beyond a certain rotational speed and its loading reaches to a
certain temperature, ECU may let small part of exhausted gas into recycling and the recycling amount of exhausted
gas can be different according to different rotational speed, loading temperature and temperature of exhausted gas,
thus realize the minimum content of NOx in exhausted gas.
发动机
转速信号
油门位置信号
水温信号
阀
涡轮
压气机
2. Working principle of post-processing
The type of post-processing is Oxidation catalytic converter which mainly converts the soluble organic component in
exhaust particulated.
13.02
Compressor