Battery Temp
#1
07-13-2009, 02:59 PM
Join Date: Apr 2008
Location: Los Angeles
Posts: 895
Battery Temp
I mentioned this in another thread, but I thought maybe it deserved it's own place.
When I got my SGII, I downloaded the settings from the Internet, which included a couple of pages of FEH specific settings. However, the setting for Hybrid Battery Temp did not work.
Does anyone have a valid programming setting for hybrid battery temp on the SGII?
When I got my SGII, I downloaded the settings from the Internet, which included a couple of pages of FEH specific settings. However, the setting for Hybrid Battery Temp did not work.
Does anyone have a valid programming setting for hybrid battery temp on the SGII?
#3
07-15-2009, 03:22 AM
Hybrid and Ethanol Expert
Join Date: Mar 2005
Location: All over the Central U.S.
Posts: 3,616
Re: Battery Temp
I'm sure you have double checked, but triple check you keyed everything exactly right. It's easy to make a mistake. Guilty myself.
Also, there are different codes, such as Tmin, Tmax, Tave, and BatEvaporator temperature ( which kind of tells the temp. of the air duct when A/C is off, and shows dramatically when the A/C is being used.
Tave is the most important one and the one that controlls how the car behaves.
Just a few factoids:
A/C is used for the battery when Tave is over 86 degrees F.
It won't come on until 87, but then stays on* until the battery = 75 degrees
* you can force A/C off with cycling the key off and back on.
Between 87 and 95 degrees, the car will use A/C but still allow EV.
Above 96 degrees and EV is disabled, like "A/C max" is on.
Today was 91-93 degrees at my house this afternoon.
I went to lunch, and the A/C cooled the battery to 77 degrees.
Then I parked in the sun, but with windows open. ( 1pm )
Did not use the car again until 10pm.
At 10pm outside air was a nice, 68 degrees.
But my battery pack was a whopping 96 degrees!!!
Even though it was cool out, my A/C was on only to the rear, and my EV was disabled for a bit. The car will not use outside air, even if outside air is cool, if the battery pack is over 86 degrees. Kind of a waste, but the car is dumb that way and does not consider OAT.
Also, there are different codes, such as Tmin, Tmax, Tave, and BatEvaporator temperature ( which kind of tells the temp. of the air duct when A/C is off, and shows dramatically when the A/C is being used.
Tave is the most important one and the one that controlls how the car behaves.
Just a few factoids:
A/C is used for the battery when Tave is over 86 degrees F.
It won't come on until 87, but then stays on* until the battery = 75 degrees
* you can force A/C off with cycling the key off and back on.
Between 87 and 95 degrees, the car will use A/C but still allow EV.
Above 96 degrees and EV is disabled, like "A/C max" is on.
Today was 91-93 degrees at my house this afternoon.
I went to lunch, and the A/C cooled the battery to 77 degrees.
Then I parked in the sun, but with windows open. ( 1pm )
Did not use the car again until 10pm.
At 10pm outside air was a nice, 68 degrees.
But my battery pack was a whopping 96 degrees!!!
Even though it was cool out, my A/C was on only to the rear, and my EV was disabled for a bit. The car will not use outside air, even if outside air is cool, if the battery pack is over 86 degrees. Kind of a waste, but the car is dumb that way and does not consider OAT.
#4
07-15-2009, 09:44 AM
Join Date: Apr 2008
Location: Los Angeles
Posts: 895
Re: Battery Temp
3.15, I don't know about the "*". When I bought the SG last year, the manual that came with it had a setting for battery temp, it just didn't work.
#5
07-15-2009, 09:46 AM
Join Date: Apr 2008
Location: Los Angeles
Posts: 895
Re: Battery Temp
I'm sure you have double checked, but triple check you keyed everything exactly right. It's easy to make a mistake. Guilty myself.
Also, there are different codes, such as Tmin, Tmax, Tave, and BatEvaporator temperature ( which kind of tells the temp. of the air duct when A/C is off, and shows dramatically when the A/C is being used.
Tave is the most important one and the one that controlls how the car behaves.
Just a few factoids:
A/C is used for the battery when Tave is over 86 degrees F.
It won't come on until 87, but then stays on* until the battery = 75 degrees
* you can force A/C off with cycling the key off and back on.
Between 87 and 95 degrees, the car will use A/C but still allow EV.
Above 96 degrees and EV is disabled, like "A/C max" is on.
Today was 91-93 degrees at my house this afternoon.
I went to lunch, and the A/C cooled the battery to 77 degrees.
Then I parked in the sun, but with windows open. ( 1pm )
Did not use the car again until 10pm.
At 10pm outside air was a nice, 68 degrees.
But my battery pack was a whopping 96 degrees!!!
Even though it was cool out, my A/C was on only to the rear, and my EV was disabled for a bit. The car will not use outside air, even if outside air is cool, if the battery pack is over 86 degrees. Kind of a waste, but the car is dumb that way and does not consider OAT.
Also, there are different codes, such as Tmin, Tmax, Tave, and BatEvaporator temperature ( which kind of tells the temp. of the air duct when A/C is off, and shows dramatically when the A/C is being used.
Tave is the most important one and the one that controlls how the car behaves.
Just a few factoids:
A/C is used for the battery when Tave is over 86 degrees F.
It won't come on until 87, but then stays on* until the battery = 75 degrees
* you can force A/C off with cycling the key off and back on.
Between 87 and 95 degrees, the car will use A/C but still allow EV.
Above 96 degrees and EV is disabled, like "A/C max" is on.
Today was 91-93 degrees at my house this afternoon.
I went to lunch, and the A/C cooled the battery to 77 degrees.
Then I parked in the sun, but with windows open. ( 1pm )
Did not use the car again until 10pm.
At 10pm outside air was a nice, 68 degrees.
But my battery pack was a whopping 96 degrees!!!
Even though it was cool out, my A/C was on only to the rear, and my EV was disabled for a bit. The car will not use outside air, even if outside air is cool, if the battery pack is over 86 degrees. Kind of a waste, but the car is dumb that way and does not consider OAT.
#6
07-15-2009, 02:27 PM
Re: Battery Temp
I thought we figured out last year or so that the Btmp didn't read for 08's, so I haven't ever re-tried. I think mine is 3.15*, I'd have to re-check to be sure. I know I checked & rechecked the codes to be sure I had them right, so if there's a new/better set I'd love to try! It's been 100+ for over a week now, even parking in the shade of the garage it's still 95+, so I'm sute BTM(?) would be high.
#7
07-16-2009, 10:14 AM
Join Date: Apr 2008
Location: Los Angeles
Posts: 895
Re: Battery Temp
I thought we figured out last year or so that the Btmp didn't read for 08's, so I haven't ever re-tried. I think mine is 3.15*, I'd have to re-check to be sure. I know I checked & rechecked the codes to be sure I had them right, so if there's a new/better set I'd love to try! It's been 100+ for over a week now, even parking in the shade of the garage it's still 95+, so I'm sute BTM(?) would be high.
#8
07-18-2009, 12:29 AM
Hybrid and Ethanol Expert
Join Date: Mar 2005
Location: All over the Central U.S.
Posts: 3,616
Re: Battery Temp
I discovered a new behavior today.
The A/C will come on for the rear at 80 degrees battery temp. and not go off until 71 degrees battery temp. if the A/C is turned on to the cabin (front) at the same time.
Otherwise, if the front A/C is off, the A/C won't come on until the battery gets over 86 degrees, and shuts off at 75 degrees.
Not a big deal, but interesting someone took the time to write two different control strategies.
The A/C will come on for the rear at 80 degrees battery temp. and not go off until 71 degrees battery temp. if the A/C is turned on to the cabin (front) at the same time.
Otherwise, if the front A/C is off, the A/C won't come on until the battery gets over 86 degrees, and shuts off at 75 degrees.
Not a big deal, but interesting someone took the time to write two different control strategies.
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