Current fuel pressure protection relies on a delta which takes into consideration Map. However on my fuel set up we use fixed fuel pressure of 3.5 bar on a NA application. As a result I have had to set the delta values wide to allow for map changes. Is it possible to change the Fuel pressure protection to have a choice between referencing the fuel pressure only or FP delta value?
Thanks.
You need to select proper fuel pressure regulator:
This settings influence the VE table as the ECU takes into consideration that your rail fuel pressure is fixed and do not change with the MAP.
In your case it gives you proper flat VE table
Afternoon. I have already set the Baro referenced.
I have attached a screenshot of the log, at the bottom fuel pressure is steady 3.5bar and the differential fuel pressure is obviously moving with the map reading so unable to set up fuel pressure protection without a large window of operation.
Additionally what is the difference between Baro referenced and Baro referenced + fuel pressure sensor.
Thanks
I will check then.
The option Baro ref + pressure sensor means that your base pressure is defined. But if the measured pressure differs (eg. is lower due to fuel pump issue or installation voltage drop) it will adjust the injectors PW to provide the same amount of the fuel as there was base pressure.
Just looking through logs from the latest version.
I have noticed that at idle there is -7% fuel pressure correction being applied. But when revving the engine to create Map pressure of 100kpa the FP correction drops to 0%.
I have attached screenshots with two lots of the graph pointed out.
From our previous messages and setting up the fuel pressure correction as the above screenshots should not result is this correction as fuel pressure is fixed at 350kpa
I am not using a baro sensor so I have left this unticked, the drop down set the baro and the default baro pressure reading never moves in the log from 100kpa, as expected yet the fuel pressure correction appears to be applied as result of the map reading?
Did you get a chance to look at this further?
3 rev log 240805.emublog3 (45.2 KB)
In comparison, mine is set as follows:
Yet there is nothing happening on the fuel pressure correction channel, its always zero?
Are the MAP referenced and BARO referenced options potentially reversed?
I don’t use a BARO sensor and have no plans to.
I also don’t want a MAP referenced correction.
I use an OEM Volkswagen fuel filter with a fixed, 4 bar fuel pressure. This is in a dead head setup as it would be in the OEM vehicle. It does not have a MAP reference. What option should I be using?
20240721_0957.emublog3 (6.0 MB)
You can see here screen capture with engine running: https://www.youtube.com/watch?v=ROB5D4yWrk4
The lower 3 options in the dropdown appear to do the same thing, where MAP Referenced always remains zero
@Jadzwin_ECUMASTER
Looked into this a bit further this evening same as F0xy.
When set to “Map” the fuel pressure correction is no longer showing values so assume it is no longer being applied as a correction, with the base fuel pressure 3.5bar as expected - As suggested is the logic reversed for the Baro / Map setting reversed?
Differential fuel pressure is now pinned at Zero when the fuel pressure moves slightly 3.4 - 3.6 bar, so the fuel protection function doesn’t work in this application either.
For the time being I have created. Function to bring on EML for fuel pressure below a threshold.
Hello!
Actually the problem is that differential fuel pressure is not a differential fuel pressure.
It is like effective fuel pressure.
It will be changed in next build. There will be channel effective fuel pressure, and delta fuel pressure that is equal effective fuel pressure - fuel pressure.
For baro referenced sensors there is always applied the fuel correction.
If the MAP lowers, the effective fuel pressure increases (eg. fixed pressure is 350kpa g, the MAP is 50kpa so effective fuel pressure is 300kpa g)
So the injectors time must be shortened. Due to this mechanism the VE table is the real VE table and it is more flat than without such correction.
I hope it explains it better.
Next buld will sort it out
Help from version 3.033
I hope this time it is more clear. If you have any doubts please ask, it helps to improve the help section
Fuel Pressure Regulator
Depending on the fuel pressure regulator used and the presence of a fuel pressure sensor, the appropriate type of regulator should be selected. The use of a fuel pressure sensor allows for active correction of the fuel dose when the measured fuel pressure differs from the theoretically calculated value. In the absence of a sensor or if the sensor returns a status other than OK, the fuel dose correction is not active.
Log Channels
MAP Referenced
The pressure in the fuel rail changes relative to the pressure in the intake manifold in a 1:1 ratio. If the pressure in the intake manifold increases, the fuel pressure increases. The effective pressure should have a constant value defined by the Base pressure parameter.
MAP Referenced + Fuel Pressure Sensor
The pressure in the fuel rail changes relative to the pressure in the intake manifold in a 1:1 ratio. If the pressure in the intake manifold increases, the fuel pressure increases. The effective pressure should have a constant value defined by the Base pressure parameter. If the measured fuel pressure, adjusted for MAP value, differs from the Base pressure, a fuel dose correction is applied. The pressure difference is visible in the Fuel pressure error channel.
Baro Referenced
The pressure regulator maintains a constant pressure defined by the Base pressure parameter. The effective fuel pressure changes along with the pressure in the intake manifold (MAP) and influences the calculated fuel dose.
Delta Effective Fuel Pressure
The pressure regulator maintains a constant pressure defined by the Base pressure parameter. The effective fuel pressure changes along with the pressure in the fuel rail and the intake manifold (MAP) and influences the calculated fuel dose.
Thanks.
Will look at it more in the next build when it is released.
Thanks.
