Block and transaxle heaters: 53.4 MPG @ 32F (0C)
#1
Block and transaxle heaters: 53.4 MPG @ 32F (0C)
Hi,
We had a strong cold front come through yesterday and over night, the temperatures dropped to 25F (-4C). So at midnight, I plugged in my block and pan heaters so this morning, the ICE started at 34C, MG1 at 31C and MG2 at 28C.
I followed my standard warm-up cycle, speed <= 25 mph until coolant reached 70C and then trigger an ICE auto-stop as soon as possible. Thereafter, normal commuting speeds up to 55 mph and holding 25-30 mph on the last mile to work. When I parked, the MFD showed 53.4 MPG, pretty much what I get in the spring, summer and fall.
Bob Wilson
We had a strong cold front come through yesterday and over night, the temperatures dropped to 25F (-4C). So at midnight, I plugged in my block and pan heaters so this morning, the ICE started at 34C, MG1 at 31C and MG2 at 28C.
I followed my standard warm-up cycle, speed <= 25 mph until coolant reached 70C and then trigger an ICE auto-stop as soon as possible. Thereafter, normal commuting speeds up to 55 mph and holding 25-30 mph on the last mile to work. When I parked, the MFD showed 53.4 MPG, pretty much what I get in the spring, summer and fall.
Bob Wilson
#2
Re: Block and transaxle heaters: 53.4 MPG @ 32F (0C)
I can ( but don't ) check the MG1 temp, and MG2 temp. Is that something important to your car?
With ~3 hours of plug time in a ~25'F garage, my engine water temp said 89'F and my cylinder head temp. said 111'F. My plug-in warmer includes a high voltage battery heater, and my HV battery was 59'F this A.M.
I have 1 mile of residential, followed by 8 miles of highway ( 55 MPH ) followed by half a mile of work driveway ( usually EV ).
It was 15'F outside, and I had 34.1 MPG in my FEH after 9.9 miles.
That would have been high 20's without the plug-in heaters.
-John
With ~3 hours of plug time in a ~25'F garage, my engine water temp said 89'F and my cylinder head temp. said 111'F. My plug-in warmer includes a high voltage battery heater, and my HV battery was 59'F this A.M.
I have 1 mile of residential, followed by 8 miles of highway ( 55 MPH ) followed by half a mile of work driveway ( usually EV ).
It was 15'F outside, and I had 34.1 MPG in my FEH after 9.9 miles.
That would have been high 20's without the plug-in heaters.
-John
#3
Re: Block and transaxle heaters: 53.4 MPG @ 32F (0C)
This winter, I plan to do more studies and quantify the effect of transaxle preheating. The problem is all of the transaxle heating comes from mechanical working of the oil and MG1/MG2 resistance losses. I'm out to minimize the mechanical working loss.
Bob Wilson
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