Posted by A Sherman on June 2, 2006, 1:19 am
>>
>> "mark_digital©" wrote
>>>
>>> I misunderstood what you meant by compression braking because the engine
>>> is not involved with slowing the car..........
>>>
>>> Have a good day and enjoy your Prius.
>>
>> Thanks Mark, I do enjoy my Prius.
>>
>>
>> Your reply pointed out that I did not realize that MG2 ordinarily provides
>> the dynamic braking without involvement of the ICE.
>>
>> Now that I am thinking about it, I assume that the ICE and MG1 must both be
>> involved in braking when in "B" mode. They both must provide retarding
>> forces (actually torques) that are apportioned by the power split device.
>>
>> I was assuming that this use of MG! and the ICE would also happen during
>> "dynamic braking". Now I realize that this is unnecessary with dynamic
>> breaking provided by MG2. So here are new questions:
>>
>> Do I understand this correctly?
>> Is MG1 and ICE "pumping" ever used for retarding in "D", or is it only used
>> in "B"?
>>
>> Al
>>
>>
> I just went to a web site to get a better understanding and I can't see how
> the engine can remain "hard connected" to the wheels, provide resistance and
> all the while not suffer scored cylinder walls.
The engine is not "hard connected" to the wheels. I think one of the better
explanations is at:
http://www.ecrostech.com/prius/original/PriusFrames.htm
Enjoy!
Al
Posted by Bob Wilson on May 20, 2006, 2:08 am
> Ya' know. I just got this car serviced last week and I'm only getting 37.8
> mpg on the screen in last 100 miles.
>
> I know they put in Mobil 1 over the old Dino Havoline, but I cannot figure
> out why the dramatic drop.
Is your oil over the fill line? The optimum is 3/4 between F and E.
> I just checked the tires and they were down to 30 psi all around from
> dealer. I bumped them back up to 40 front, 38 rear.
I have pressure sensor tire caps at 40 psi.
>
> I'm going to try and set the cruise control at 50, 60, 70, 80, and 90 mph
> and see what the thing does at each. I know I drive fast and am hot off the
> line, but still seems low overall compared to others.
I use a run of at least 150-200 miles to make sure enough gas is burned
to get a good metric. I'm looking forward to your data.
Bob Wilson
Posted by B. Peg on May 21, 2006, 11:39 pm
Okay.
This car is a victim of it's environment. I thought the mileage up I-5 was
going to be crap and it was: 39-41 mpg running 80-85 mph.
What was really odd was while in San Francisco with all the hills, rainy
weather, constant temps in the 70's, the car reported 50.8 mpg! Huh? I
never see that figure in Southern San Jacquin Valley. All I get around
there is 43 mpg. Maybe the SJV air is so crappy it won't burn as well?
Granted S.F. is more stop and go and slow driving than what I'm accustomed
to. Guess I'll pipe down a while about mpg numbers and why some are getting
so much more than I.
I read earlier about the parking brake thing. One of my mechanics in the
past told me not too set the parking brake if the shoes are really hot else
I may warp the drum and get a pulsating in the pedal. I just leave it in
plain old Park.
B~
Posted by Michael Pardee on May 22, 2006, 12:47 am
> Okay.
> This car is a victim of it's environment. I thought the mileage up I-5
> was going to be crap and it was: 39-41 mpg running 80-85 mph.
> What was really odd was while in San Francisco with all the hills, rainy
> weather, constant temps in the 70's, the car reported 50.8 mpg! Huh? I
> never see that figure in Southern San Jacquin Valley. All I get around
> there is 43 mpg. Maybe the SJV air is so crappy it won't burn as well?
> Granted S.F. is more stop and go and slow driving than what I'm accustomed
> to. Guess I'll pipe down a while about mpg numbers and why some are
> getting so much more than I.
> I read earlier about the parking brake thing. One of my mechanics in the
> past told me not too set the parking brake if the shoes are really hot
> else I may warp the drum and get a pulsating in the pedal. I just leave
> it in plain old Park.
> B~
An oddity many oof us have noticed is that the hybrid system really seems to
like hills.
Mike
Posted by =?iso-8859-1?Q?mark=5Fdigital= on May 22, 2006, 8:56 am
> Okay.
> This car is a victim of it's environment. I thought the mileage up I-5
> was going to be crap and it was: 39-41 mpg running 80-85 mph.
> What was really odd was while in San Francisco with all the hills, rainy
> weather, constant temps in the 70's, the car reported 50.8 mpg! Huh? I
> never see that figure in Southern San Jacquin Valley. All I get around
> there is 43 mpg. Maybe the SJV air is so crappy it won't burn as well?
Maybe the software was convinced it was safe to give you electromotion and
not be called upon for speed demon antics. May sound silly but it does use
logic based on the driver's habits. You're safe as long as it doesn't use
face recognition. Let's hope it doesn't report to the Toyota service
department you have a split personality.
>> "mark_digital©" wrote
>>>
>>> I misunderstood what you meant by compression braking because the engine
>>> is not involved with slowing the car..........
>>>
>>> Have a good day and enjoy your Prius.
>>
>> Thanks Mark, I do enjoy my Prius.
>>
>>
>> Your reply pointed out that I did not realize that MG2 ordinarily provides
>> the dynamic braking without involvement of the ICE.
>>
>> Now that I am thinking about it, I assume that the ICE and MG1 must both be
>> involved in braking when in "B" mode. They both must provide retarding
>> forces (actually torques) that are apportioned by the power split device.
>>
>> I was assuming that this use of MG! and the ICE would also happen during
>> "dynamic braking". Now I realize that this is unnecessary with dynamic
>> breaking provided by MG2. So here are new questions:
>>
>> Do I understand this correctly?
>> Is MG1 and ICE "pumping" ever used for retarding in "D", or is it only used
>> in "B"?
>>
>> Al
>>
>>
> I just went to a web site to get a better understanding and I can't see how
> the engine can remain "hard connected" to the wheels, provide resistance and
> all the while not suffer scored cylinder walls.