Hybrid maverick 's engine normal operation sound?

[sammy]

I have 24 Maverick XL hybrid, odometer(2000)
When I am driving, I frequently feel my hybrid ICE start. I was aware that a computer controls the on/off of ICE.
I have been heard pretty low rpm noise (nearly unable to hear this engine noise)
but yesterday, I can hear the engine noise was not quite; actually, I reminded the noise when I stepped gas pedal hardly to reach the 50~60% power gauge (but the power gauge needle indicated 20~30%, and I could hear the similar noise from the engine)

I researched about this issue, and some users said it is up to the engine's RPM and the RPM up to computer's decision.
I want to know if the battery in my hybrid Maverick is low and if the computer recognizes that it needs to be recharged at high RPM.
If it is correct, then why does my maverick frequently stop the ICE when I wait for a traffic signal? (The ICE resumes when I leave.)

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[MaveRichard]

I want to know if the battery in my hybrid Maverick is low and if the computer recognizes that it needs to be recharged at high RPM.
If it is correct, then why does my maverick frequently stop the ICE when I wait for a traffic signal? (The ICE resumes when I leave.)

The short answer to your first question is yes.

It is most efficient to charge and move at the same time. It will charge while stationary only if it needs to generate heat for the cabin.

Sitting still is always 0 MPG.

When you hear higher rpm’s when you take off it just means that you emptied high voltage battery (30%)and gave it room to charge at the next stop

 

[sammy]

The short answer to your first question is yes.

It is most efficient to charge and move at the same time. It will charge while stationary only if it needs to generate heat for the cabin.

Sitting still is always 0 MPG.

When you hear higher rpm’s when you take off, it just means that you emptied high-voltage battery (30%) and gave it room to charge at the next stop

Thank you for your reply,
Therefore, it is normal for the engine to run at high RPM at median speeds (30–50 mph).
Do you think the engine will resume running at low RPM if the Maverick Bettery is fully charged?

 

[HeyBales]

How do you know it's running at high RPM's since there is no tach?
Sound only?
Sure it isn't one of the two motors? Now that's high RPM!

Yes it will lower engine rpm if battery is above 40% remaining.
And it will turn off at a stop unless you reach it at 30% in which case it'll run at idle.
It's probably not running that high RPM unless it's cold and it needs to get to operating temp.

 

[sammy]

How do you know it's running at high RPM's since there is no tach?
Sound only?
Sure it isn't one of the two motors? Now that's high RPM!

Yes it will lower engine rpm if battery is above 40% remaining.
And it will turn off at a stop unless you reach it at 30%, in which case it'll run at idle.
It's probably not running that high RPM unless it's cold and it needs to get to operating temperature.

The same engine sound is what I recall hearing as I accelerated to get onto a freeway. similar to sport mode (50–60% power)

 

[MaveRichard]

Thank you for your reply,
Therefore, it is normal for the engine to run at high RPM at median speeds (30–50 mph).
Do you think the engine will resume running at low RPM if the Maverick Bettery is fully charged?

Yes, it will. But also it is actually more efficient for the high voltage battery to be less charged.

 

[Ozarkbeard]

The computer will keep the HV battery between ~30-70%. The ICE won't run at stop lights unless you're running the heater or if the battery is really low.

One scenario where you may hear the engine turning at high RPM is if you're going down a hill and additional braking is needed. It will be more likely to happen then, if you're using the L button on the shifter for regenerative braking and the battery is also fully charged during the downhill descent. It can also occur when L is not being used, but battery is full.

 

[dochawk]

How do you know it's running at high RPM's since there is no tach?

really?

Not at all, or not unless you choose display options?

Or is this trim specific?

 

[MakinDoForNow]

I have 24 Maverick XL hybrid, odometer(2000)
When I am driving, I frequently feel my hybrid ICE start. I was aware that a computer controls the on/off of ICE.
I have been heard pretty low rpm noise (nearly unable to hear this engine noise)
but yesterday, I can hear the engine noise was not quite; actually, I reminded the noise when I stepped gas pedal hardly to reach the 50~60% power gauge (but the power gauge needle indicated 20~30%, and I could hear the similar noise from the engine)

I researched about this issue, and some users said it is up to the engine's RPM and the RPM up to computer's decision.
I want to know if the battery in my hybrid Maverick is low and if the computer recognizes that it needs to be recharged at high RPM.
If it is correct, then why does my maverick frequently stop the ICE when I wait for a traffic signal? (The ICE resumes when I leave.)

The hybrid battery is a "flow battery". It will try to keep at least 28% soc. At 30% soc the ice will be started and run at a fast idle (1150?) to charge the HVB TO 40% so and then turn Ice off. The 30-40% is used to power the dcdc converter for all 12-15.6 v buss plus whatever the dc voltage is for AC compressor, etc. The HVB soc from 40-72%(+/-) is reserved to hold the Regen charging and will be discharged asap for max mpg. Engine braking will start soon after 72% and be vigorous after 80% soc. 80-100% soc is not used much and is the reserve capacity so it will last the 10yr/100-150k miles. The faster rpm of ice heard sometimes is when it's charging the 30-40% hvb, plus charging 12v battery plus ac power, plus sending torque to wheels.
When ice stops at light to save gas have will have more than 30% to last through the (30-45? Seconds) light to save gas. If you press go pedal past about 10% power usage ice will start as that would require ice to furnish at least some needed torque. Choose "instantaneous mpg display" as you can watch all electric usage easier.

 

[The Real Maverick]

The hybrid battery is a "flow battery". It will try to keep at least 28% soc. At 30% soc the ice will be started and run at a fast idle (1150?) to charge the HVB TO 40% so and then turn Ice off. The 30-40% is used to power the dcdc converter for all 12-15.6 v buss plus whatever the dc voltage is for AC compressor, etc. The HVB soc from 40-72%(+/-) is reserved to hold the Regen charging and will be discharged asap for max mpg. Engine braking will start soon after 72% and be vigorous after 80% soc. 80-100% soc is not used much and is the reserve capacity so it will last the 10yr/100-150k miles. The faster rpm of ice heard sometimes is when it's charging the 30-40% hvb, plus charging 12v battery plus ac power, plus sending torque to wheels.
When ice stops at light to save gas have will have more than 30% to last through the (30-45? Seconds) light to save gas. If you press go pedal past about 10% power usage ice will start as that would require ice to furnish at least some needed torque. Choose "instantaneous mpg display" as you can watch all electric usage easier.

PMS (pretty much so)

However I have never never ever seen the HV battery pack display more than 72.2% charge. Even going down the longest hills in the USA. I'd be surprised if anyone has seen higher than this.
(You need an OBDII reader to see percent and I have one attached all the time.)

 

[HeyBales]

really?

Not at all, or not unless you choose display options?

Or is this trim specific?

None of the hybrid models have a tach available for display so far. (engineering test mode will show RPM, but then you lose most your other useful displays)
Not really a useful need for it, just curiosity. Already a gauge that tells you engine is running or not. Nothing actionable off the RPM being seen.

3rd party scan tool can show engine, traction & generator motor RPM's though.
Again just curious observing as nothing can be done from it.

 

[dochawk]

But I want to know!

it just isn't right for the car to know something that I don't!

[little yellow guy stamping his foot goes here]

 

[mkrdsr1]

The computer will keep the HV battery between ~30-70%. The ICE won't run at stop lights unless you're running the heater or if the battery is really low.

One scenario where you may hear the engine turning at high RPM is if you're going down a hill and additional braking is needed. It will be more likely to happen then, if you're using the L button on the shifter for regenerative braking and the battery is also fully charged during the downhill descent. It can also occur when L is not being used, but battery is full.

We just experienced this for the first time on a trip to West Virginia and Pennsylvania. I was concerned at first, but after hitting the accelerator to get the transmission to shift, I figured this was normal

 

[Ozarkbeard]

We just experienced this for the first time on a trip to West Virginia and Pennsylvania. I was concerned at first, but after hitting the accelerator to get the transmission to shift, I figured this was normal

The transmission doesn't shift in your Hybrid. It is an eCVT and doesn't have gears like the ecoboost transmission does.

When you hit the go pedal, the computer got a signal to stop downhill braking, which stopped the engine braking assist.

 

[mkrdsr1]

The transmission doesn't shift in your Hybrid. It is an eCVT and doesn't have gears like the ecoboost transmission does.

When you hit the go pedal, the computer got a signal to stop downhill braking, which stopped the engine braking assist.

Duh, I knew that, still not used to CVT

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