Are you asking if I feel a jerk transitioning to EV when I'm not getting fuel cut? I'm not sure, but I'll check. All transitions to/from EV are so much smoother than my 2007 FEH, I barely notice them unless I'm looking at the gauges.

I'm sure you're right about SoC below 47 not being the determining factor. This does not happen as often as it used to (not getting fuel cut). Could temperature or break-in effect this? Another difference is the service I had a couple of months ago for the engine light (both o2 sensors and exaust manifold were replaced).

--Rick

 

I noticed the same behavior this afternoon, although the SoC threshold was 46 or so. Less than 46, no open loop when coasting above 40mph (was doing 40-50). I did let it glide down into EV with closed loop a couple of times and felt a slight jolt when it dropped into EV.

May be something else going on too, but it happened 3 or 4 times as I bounced between 44 and 48 or so SoC.

-- Rick

 

Now we are on the same page with the slight jolt I'm seeing in the transition from fuel-cut to EV at 40mph or so. I'll watch the 46% Soc requirement and post my findings. At fill-up I changed my fuel-cut settings to 16 on one SGII and 17 on the other SGII and you can see my mileage in the mileage log only at CleanMPG.com:
http://www.cleanmpg.com/index.php?page=garage&displayunits=MPG(US)&viewcar =2612

GaryG

 

Gary:

Is that actual MPG or what the SG shows?

 

The SGII was way off from MPG but it is adjusted much better now. That is actual MPG I pumped from the time my FEH rolled off the assembly line and tested. In other words the lifetime mileage on my OD is divided by the gas I pumped into the tank. This is as much actual as it gets with no BS from the time it was first started at the factory.

GaryG

 

Gary:

Driving today, anytime over about 40mph where it seems to go open loop while coasting, it went 9,999mpg every time. As soon as brakes are applied, it goes closed loop.

 

Hmm.... in my 2005 IIRC I can hit the brakes ( over 40 MPH ) while in open loop / fuel cut and it stays in fuel cut. ( such as when going down a very steep hill )

 

It sounds like Ford had to design the software so the brakes would not cause a problem with the transmission holding the engine idle during fuel-cut. Our eCVT uses regen when applying the brake pedal but I'll be sure and check it out latter.

Today I was on I-95 doing between 60 - 65mph and I did a lot of fuel-cut during decel and I noticed it took ~3 seconds to go open loop any time I let off the gas pedal. I think the idle at that speed was to high for my SGII fuel-cut setting to read 9,999. I'm at 16 and 17 now and maybe I need to go 18 because I did not get above 200mpg or so when I went open-loop at that speed.

GaryG

 

I've been told that fuel cut has been used for years by Ford on some of its gas engines and it's nothing new. No real way to double check that as I don't own another older Ford product!

Googling showed patents from Ford going back 1998 and 2000. Even mentioned a 2.0L 1998 Ford Escort. Early systems had problems and the latest patent explains a very complex system of engine controls for fuel cut.

 

I am positive that my '95 Mustang has fuel cut after you're off of the throttle in a deceleration scenario. The engine will change tone approx. 1 second after full throttle release and deceleration is more noticeable. This change in tone is the same as when you turn off the ignition while decelerating (like you would if your brakes didn't work and you needed to use the engine to stop). Staying slightly on the throttle (but still slowing without the brakes) will NOT result in the same tone change and deceleration characteristics.

Unfortunately, since it's a pre-1996 computer, I can't use tools like the scanguage to confirm full fuel cut but there is definitely some.

I have also found articles in the past where the 1987 Buick Turbo Regals (Grand National) had fuel-cut in their programming as well.