Fuel additive
Role
Role of the fuel 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
Fuel additive EOLYS (supplier "RHODIA")
Composition
- Cerine: 6,5% by mass (EOLYS 176)
- Catalytic converter: brown colour
- Solvent product (combustible hydrocarbon)
Fuel 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. the "fuel additive level check" procedure specifies the method for checking the level of fuel additive in the vehicle
Location
(4) fuel additive tank
(5) fuel tank
Location: under the fuel tank
Fuel additive pump (1283)
Role
The fuel additive pump delivers a precise quantity of pressurised additive to the fuel additive circuit
Description
"a" outlet to fuel additive injection valve
"b" connector
(3) fuel additive pump
The fuel additive pump is a positive displacement metering pump
The quantity of fuel additive delivered depends on the unit capacity of the fuel additive pump
The unit capacity of the fuel additive pump is 6,45 mm3
Depending on the quantity of fuel added, the engine management ECU determines the quantity of fuel additive to be injected into the fuel tank
The engine ECU controls the fuel additive pump by means of an OCR signal
NotePulse of the OCR signal = one injection of a capacity of 6,45 mm3 (OCR: opening cyclic ratio)
Fuel additive pump connector
| channel of the fuel additive pump connector | signal |
|---|---|
| 1 | - |
| 2 | - |
| 3 | 12 Volts (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 fuel additive pump is immersed in the fuel additive tank
NoteThe fuel additive pump cannot be separated from the fuel 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 bars 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
To inform the BSI1 of the opening and closing of the fuel tank cap
Role of the BSI1 as a function of the information received: to detect that fuel may be added
Description
(6) contact
(7) 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 engine management ECU
Role of the engine management ECU in accordance with the information received
- To determine the quantity of fuel additive to be injected
- To control the fuel additive pump
Check
A = height of the float pin in relation to the base plane
Fuel gauge check
| height of the float pin in relation to the base plane (mm) | resistance (ohm) |
|---|---|
| 14 | 350 ± 11 |
| 41 | 300 ± 10 |
| 72 | 250 ± 10 |
| 104 | 200 ± 9 |
| 138 | 150 ± 9 |
| 171 | 100 ± 8 |
| 204 | 50 ± 2 |
Built-in systems interface (BSI1)
The BSI1 sends the following information to the engine ECU
- 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 engine management ECU
- Minimum fuel additive level warning
- 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
Engine ECU
The engine management ECU manages the injection of fuel additive
The engine management ECU software incorporates
- Management of the beginning and duration of additive injection into the fuel tank
- Management of the total quantity of fuel additive injected since the start of the service life of the particle filter
- Emergency strategies
- Memorisation of faults present
The engine management ECU carries out the electric control of the fuel additive pump