AdBlue/DEF PUMP

STRUCTURE OF AdBlue/DEF PUMP

A: Suction from AdBlue/DEF tank

B: Return to AdBlue/DEF tank

C: Pressurized sending to AdBlue/DEF injector

1: AdBlue/DEF pump

2: AdBlue/DEF inlet connector

3: AdBlue/DEF return connector (*1)

4: AdBlue/DEF outlet connector

5: Electric connector

6: AdBlue/DEF filter cap

7: AdBlue/DEF filter (built-in)

*1: There are some machine models which are not equipped with check valve.

•The followings are built-in: The filter to collect the dust in AdBlue/DEF, the valve to switch the flow direction when purging, and the heater to thaw AdBlue/DEF when it is frozen.

•It sucks AdBlue/DEF from AdBlue/DEF tank, pressurizes it to 900 kPa {9.18 kgf/cm2} , and sends it to AdBlue/DEF injector.

•To prevent wrong connection of connectors, the return connectors are white and can be distinguished from others. The sizes of inlet connector and outlet connector are different and they cannot be connected each other.

AdBlue/DEF INJECTOR

STRUCTURE OF AdBlue/DEF INJECTOR

A: Pressurized sending from AdBlue/DEF pump

B: Coolant inlet

C: Coolant outlet

1: AdBlue/DEF injector

2: AdBlue/DEF inlet connector

3: Coolant inlet connector

4: Coolant outlet connector

5: Electric connector

FUNCTION OF AdBlue/DEF INJECTOR

•It injects AdBlue/DEF which is pressurized by AdBlue/DEF pump into AdBlue/DEF mixing tube.

•The injection amount is controlled by the valve opening or closing time while the pressure is constant.

•It circulates the engine coolant to prevent it from being heated by the heat from the exhaust pipe.

OPERATION OF AdBlue/DEF INJECTOR

Principle of injection of the injector is described. Following figure shows the state of injection.

1. Engine controller sends the electrical signal to control AdBlue/DEF injector.

2. Solenoid (4) moves seal ball (2), and seal ball (2) leaves from injection port (1) to make opening state. Pressurized AdBlue/DEF by AdBlue/DEF pump is injected.

3. When the electrical signal is not sent, seal ball (2) closes injection port (1) with spring force (3), so AdBlue/DEF is not injected.