Additive
Role
Role of the additive
- To lower the combustion temperature of the particles to 450°C (instead of 550°C)
- To impregnate the particles forming in the combustion chamber
- To propagate combustion of the particles
Description
Additive EOLYS (supplier "RHODIA")
Composition
- Cerine: 6,5% by mass (EOLYS 176)
- Catalytic converter: brown colour
- Solvent product (combustible hydrocarbon)
Additive tank
Description
(1) fuel additive filler pipe
(2) breather pipe
(3) fuel additive pump (1283)
The quantity put in at the factory is 3,5 litres
NoteIn after-sales, you use 3 litres of fuel additive
NoteThe "fuel additive level check" procedure specifies the method for checking the level of fuel additive in the vehicle
Location
(4) additive tank
(5) fuel tank
Location: under the fuel tank
Additive injection pump (1283)
Role
The additive injection pump delivers a precise quantity of additive under pressure into the additive circuit
Description
"a" outlet to fuel additive injection valve
"b" connector
(6) positive displacement metering pump
The fuel additive pump is a positive displacement metering pump
The quantity of additive delivered depends on the unit capacity of the positive displacement metering pump
The unit capacity of the positive displacement metering pump is 6,45 mm3
As a function of the quantity of fuel added, the diesel injection ECU calculates the quantity of fuel additive to be injected into the fuel tank
The diesel injection ECU commands the volumetric metering pump by means of an OCR signal
Note1 pulse of the OCR signal = one injection of a capacity of 6,45 mm3
NoteOCR: opening cyclic ratio
Fuel additive pump connector
| channel of the fuel additive pump connector | signal |
|---|---|
| 1 | - |
| 2 | - |
| 3 | 12V power relay |
| 4 | RCO signal |
The fuel additive pump (1283) is controlled by an OCR signal
Features of the OCR signal
- Opening ratio of 34%
- Frequency of the OCR signal 45Hz
- Amplitude of the OCR signal 12 volts
Location
The pump is submerged in the additive tank
NoteThe pump cannot be separated from the additive tank
Valve
Role
The valve ensures that a defined quantity of additive is injected into the fuel tank
Description
Pressure of the fuel additive injection valve
- 0,23 bar (relative pressure)
- 1,23 bar absolute pressure
NoteThe additive injection valve is not an electrical component
Location
The additive injection valve is located on the plate of the fuel pump gauge module
Fuel tank cap presence sensor (4320)
Role
The fuel tank cap presence sensor informs the BSI1 whether the cap is open or closed
Role of the BSI1 as a function of the information received: to detect that fuel may be added
Description
(7) contact
(8) permanent magnet
The filler cap is fitted with a magnet and when the cap is closed, the magnet is opposite the contact
Electrical special features
Allocation of channels of connector
- Terminal 1: 5 volts supply
- Terminal 2: signal
- Presence of the magnet opposite the contact: resistance = 150 000 ohms
- Absence of the magnet opposite the contact: resistance = 15 ohms
Fuel gauge (1211)
Role
The fuel gauge informs the BSI1 of a variation in the level of fuel
The BSI1 sends the information to the diesel injection ECU
Role of the diesel injection ECU as a function of the information received
- Determine the amount of additive to be injected
- To control the additive injection pump
Check
H = height of the float pin in relation to the base plane
Check: fuel gauge
| height of the float pin in relation to the base plane | resistance |
|---|---|
| 14 mm | 350 ± 11 ohms |
| 41 mm | 300 ± 10 ohms |
| 72 mm | 250 ± 10 ohms |
| 104 mm | 200 ± 9 ohms |
| 138 mm | 150 ± 9 ohms |
| 171 mm | 100 ± 8 ohms |
| 204 mm | 50 ± 2 ohms |
Built-in systems interface (BSI1)
The BSI1 sends to the diesel injection ECU the following information
- Volume of fuel added
- Counter of the volume of fuel added
- Status of additive system (diagnosis of the additive system)
The BSI1 receives the following information from the diesel injection ECU
- Additive low level fault
- Request for lighting of the "MIL" lamp
- Risk of particle filter clogging
This information keeps the driver informed of the condition of the particle filter
Diesel injection ECU
The diesel injection ECU controls the injection of additive
The diesel injection ECU software incorporates
- Management of the beginning and duration of additive injection into the fuel tank
- Management of the total amount of additive injected since the beginning of the filter's life
- Emergency strategies
- Memorisation of faults present
The diesel injection ECU controls the additive injection pump electrically