Effect of heat on ICE auto-shutoff
#11
08-24-2007, 08:38 AM
Re: Effect of heat on ICE auto-shutoff
It is in the battery management software to require A/C cooling when the battery pack temperature hits 38'C ( 100.5'F ) or above. This in effect, disables EV.
Between 31'C and 37'C ( 88'F to 99'F ) the A/C will be used to cool the battery pack only when the engine is running for other purposes. You can get EV, but sometimes it takes a few seconds longer as the car waits for the A/C to stop the compressor before stopping the ICE.
Below 31'C, A/C cooling is usually not used for the battery pack.
Between 31'C and 37'C ( 88'F to 99'F ) the A/C will be used to cool the battery pack only when the engine is running for other purposes. You can get EV, but sometimes it takes a few seconds longer as the car waits for the A/C to stop the compressor before stopping the ICE.
Below 31'C, A/C cooling is usually not used for the battery pack.
Using the a/c all the time (though still using ECO) hasn't been very helpful with MPG numbers. I console myself with the fact that even the lower MPG numbers are far better than what any other SUV can hope to get.
#12
08-24-2007, 08:59 AM
Re: Effect of heat on ICE auto-shutoff
Sorry to get a little off track, but could somebody please post the link on how to measure the traction battery pack’s temperature on the LCD dash.
I have searched several times through the forum, and I can not find that topic.
Maybe then we can measure our traction battery pack temperature and see for ourselves how fast/slow it cools a hot battery.
Thanks
Rick
I have searched several times through the forum, and I can not find that topic.
Maybe then we can measure our traction battery pack temperature and see for ourselves how fast/slow it cools a hot battery.
Thanks
Rick
#13
08-24-2007, 10:55 AM
Re: Effect of heat on ICE auto-shutoff
To enter the LCD diag menu, 1) press and hold the trip odometer reset button 2) start the vehicle.
After a few seconds the lcd will say something about test. To step through the items, press and release the trip reset button. I don't remember what the text is for the battery temp, but it made sense. There are also lists of the items around the net, but I couldn't find one with my quick search.
After a few seconds the lcd will say something about test. To step through the items, press and release the trip reset button. I don't remember what the text is for the battery temp, but it made sense. There are also lists of the items around the net, but I couldn't find one with my quick search.
#14
08-24-2007, 11:03 AM
Re: Effect of heat on ICE auto-shutoff
On my 08 FEH the system test is done differently. There is no trip button.
You hit setup, then reset
I was also thinking, if you could add a secondary HV battery cooling function. It could keep the battery cool enough to allow more EV in hot climates.
Duncan
You hit setup, then reset
I was also thinking, if you could add a secondary HV battery cooling function. It could keep the battery cool enough to allow more EV in hot climates.
Duncan
#15
08-24-2007, 11:48 AM
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Re: Effect of heat on ICE auto-shutoff
Battery temp is: bt ###
Where ### is degrees C.
It takes approx. 24 presses of the button.
Other codes of worthy note:
E ###.# is speed in miles per hour (English) ( to the tenth! )
###.# is speed in kilometers per hour ( Metric)
t #### is digital tach
ET ### is Engine Temperature in degrees C
TR ##.## is Trip Odometer in miles and hundredths of a mile ( not 10ths! )
BAT ##.# is standard battery voltage
Towards the end ( about 63 button presses) you will find:
AD4 ### this is oil pressure. It is an 8-bit value from 0-255.
I normally get 150-160 for oil pressure.
This value is 160/255 which is 62% of the sender's max value.
But I have no idea what the oil pressure sender's max value is.
If anyone knows what this is, that would be helpful!
Thanks! -John
Where ### is degrees C.
It takes approx. 24 presses of the button.
Other codes of worthy note:
E ###.# is speed in miles per hour (English) ( to the tenth! )
###.# is speed in kilometers per hour ( Metric)
t #### is digital tach
ET ### is Engine Temperature in degrees C
TR ##.## is Trip Odometer in miles and hundredths of a mile ( not 10ths! )
BAT ##.# is standard battery voltage
Towards the end ( about 63 button presses) you will find:
AD4 ### this is oil pressure. It is an 8-bit value from 0-255.
I normally get 150-160 for oil pressure.
This value is 160/255 which is 62% of the sender's max value.
But I have no idea what the oil pressure sender's max value is.
If anyone knows what this is, that would be helpful!
Thanks! -John
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