1 Connection to the fuel tank
2 Fuel additive pump
3 Piezo sensor
The fuel additive pump unit consists of the fuel additive pump and a two-piece piezo sensor. The internal piezo sensor can only detect when the fuel additive tank is empty. In conjunction with the counter of the fuel additive control unit, this device thus provides additional certainty of detecting an empty fuel additive tank.
Note: There are plans to enable the external piezo sensor to detect the precise liquid level and these will be implemented at a later date.
The external piezo sensor establishes the changing viscosity of the fuel additive affected by the ambient temperature and sends this reference value to the fuel additive control unit.
On the basis of this input signal, the fuel additive control unit is able to determine precisely the injection duration for the fuel additive.
The fuel additive pump is actuated by the fuel additive control unit using pulse width modulation and supplies the injector on the fuel tank with a precise quantity of fuel additive due to its defined stroke.