Engine Block Heater for Highlander Hybrid
#21
Re: Engine Block Heater for Highlander Hybrid
I suspect that I'll never see "summer-like" MPG, but it will be better than starting at ambient temp in the winter! I've been told to heat it for 3-4 hours, so we're setting a timer to go on about that amount of time before the anticipated morning drive time. My car can get 30MPG in the summer, but was at about 19 in the winter so I hope to bring it up into the 20's with the heater.
I'm a "worst-case" driver - no garage, and only about a 5-mile commute. I never even got the car warmed up last winter on the drive into work, so I think this will help. I'll let you all know!
I'm a "worst-case" driver - no garage, and only about a 5-mile commute. I never even got the car warmed up last winter on the drive into work, so I think this will help. I'll let you all know!
So what would it cost to bring the engine block up to 130F using a block heater vs not...??
And how much of that 20.59 cents went toward simply moving the RX for that distance vs heating the block and thereby the engine coolant??
Maybe 10%, 2.059 cents...?
Hmmm..
No, wait...
The engine block is CONTINUOUSLY heated, to ~200F yet.
So, until the coolant heat rises to the point wherein the EXCESS is dumped overboard isn't that HEAT free of cost...??
It seems to me that the only time there is "value" in the engine coolant heat is for cabin heat, otherwise ALL of it is THROWN overboard.
That can't be right...or can it...??
That would mean that the cost savings for pre-heating the engine blocking would be ZILCH,...or maybe even NEGATIVE.
And then there is the catalyst, that MUST be heated to something like 800F before becoming fully operational. Does pre-heating the engine block allow more of the "initial" excess heat derived from "fuel burn" to flow into the exhaust and thereby help to heat the catalyst sooner?
Wow, too many variables for me, 'way too many.
#22
Re: Engine Block Heater for Highlander Hybrid
A cold-start is the most fuel inefficient period of operation, under 20 mpg and at times under 10 mpg. The value of an EBH wrt FE is to allow ICE to cycle through the five warm-up stages of hybrid operation sooner. During the 1st stage, the ICE always runs as long as coolant is below 104F. Use of EBH cuts this high fuel usage period by 2-3 min. The goal is then to reach stage 4 (full hybrid mode) and stay there, as soon as possible. HiHy has an 80C/182 F thermostat and takes about 35 min to reach a stable 185 F. ICE will restart at low speeds when coolant temp drops below 73C (163.4 F), which happens frequently below 32F.
During my morning drives, without EBH, ambient temps 30-40F, and a radiator screen to retain heat, the ICE is off 30 - 33% of the time (35 mpg). With a 3 hr EBH cycle, ICE is off 45 - 50% of the time (43 mpg).
During my morning drives, without EBH, ambient temps 30-40F, and a radiator screen to retain heat, the ICE is off 30 - 33% of the time (35 mpg). With a 3 hr EBH cycle, ICE is off 45 - 50% of the time (43 mpg).
#23
Re: Engine Block Heater for Highlander Hybrid
A cold-start is the most fuel inefficient period of operation, under 20 mpg and at times under 10 mpg. The value of an EBH wrt FE is to allow ICE to cycle through the five warm-up stages of hybrid operation sooner. During the 1st stage, the ICE always runs as long as coolant is below 104F. Use of EBH cuts this high fuel usage period by 2-3 min. The goal is then to reach stage 4 (full hybrid mode) and stay there, as soon as possible. HiHy has an 80C/182 F thermostat and takes about 35 min to reach a stable 185 F. ICE will restart at low speeds when coolant temp drops below 73C (163.4 F), which happens frequently below 32F.
During my morning drives, without EBH, ambient temps 30-40F, and a radiator screen to retain heat, the ICE is off 30 - 33% of the time (35 mpg). With a 3 hr EBH cycle, ICE is off 45 - 50% of the time (43 mpg).
During my morning drives, without EBH, ambient temps 30-40F, and a radiator screen to retain heat, the ICE is off 30 - 33% of the time (35 mpg). With a 3 hr EBH cycle, ICE is off 45 - 50% of the time (43 mpg).
Typo...??
Did you mean 3.5 min...??
But what about stage 2 of the "warmup" stages, the ice will remain running even with the (pre-heated) coolant up to 182F until the catalyst is at ~800F.
#24
Re: Engine Block Heater for Highlander Hybrid
No typo. See below.
Time Period------Avg Coolant (F)
Zero - 4:59 ||150.8
5:00 - 9:59 ||178.9
10:00 - 14:59||179.8
15:00 - 19:59||180.8
20:00 - 24:59||181.0
25:00 - 29:59||178.5
30:00 - 34:59||183.3
35:00 - 36:45||185.2
Steady state coolant temp is typically not reached until the 35 min point in my drive.
Remember, ICE is not running continuously after S1. When in S2, ICE shuts off only when not needed (@ 0 miles per hour) or in neutral. During my morning commute, ICE is off only 5 - 6% of the time when in S1/S2.
In S3a/b and S4, ICE can enter stealth mode (< 42 miles per hour). For my drive, ICE is off 63% of the time once I'm out of S2. I have a lot of rolling hills during the middle part of my commute, so when running, ICE recharges battery on upgrades.
Time Period------Avg Coolant (F)
Zero - 4:59 ||150.8
5:00 - 9:59 ||178.9
10:00 - 14:59||179.8
15:00 - 19:59||180.8
20:00 - 24:59||181.0
25:00 - 29:59||178.5
30:00 - 34:59||183.3
35:00 - 36:45||185.2
Steady state coolant temp is typically not reached until the 35 min point in my drive.
Remember, ICE is not running continuously after S1. When in S2, ICE shuts off only when not needed (@ 0 miles per hour) or in neutral. During my morning commute, ICE is off only 5 - 6% of the time when in S1/S2.
In S3a/b and S4, ICE can enter stealth mode (< 42 miles per hour). For my drive, ICE is off 63% of the time once I'm out of S2. I have a lot of rolling hills during the middle part of my commute, so when running, ICE recharges battery on upgrades.
#25
Re: Engine Block Heater for Highlander Hybrid
No typo. See below.
Time Period------Avg Coolant (F)
Zero - 4:59 ||150.8
5:00 - 9:59 ||178.9
10:00 - 14:59||179.8
15:00 - 19:59||180.8
20:00 - 24:59||181.0
25:00 - 29:59||178.5
30:00 - 34:59||183.3
35:00 - 36:45||185.2
Steady state coolant temp is typically not reached until the 35 min point in my drive.
Remember, ICE is not running continuously after S1. When in S2, ICE shuts off only when not needed (@ 0 miles per hour) or in neutral. During my morning commute, ICE is off only 5 - 6% of the time when in S1/S2.
In S3a/b and S4, ICE can enter stealth mode (< 42 miles per hour). For my drive, ICE is off 63% of the time once I'm out of S2. I have a lot of rolling hills during the middle part of my commute, so when running, ICE recharges battery on upgrades.
Time Period------Avg Coolant (F)
Zero - 4:59 ||150.8
5:00 - 9:59 ||178.9
10:00 - 14:59||179.8
15:00 - 19:59||180.8
20:00 - 24:59||181.0
25:00 - 29:59||178.5
30:00 - 34:59||183.3
35:00 - 36:45||185.2
Steady state coolant temp is typically not reached until the 35 min point in my drive.
Remember, ICE is not running continuously after S1. When in S2, ICE shuts off only when not needed (@ 0 miles per hour) or in neutral. During my morning commute, ICE is off only 5 - 6% of the time when in S1/S2.
In S3a/b and S4, ICE can enter stealth mode (< 42 miles per hour). For my drive, ICE is off 63% of the time once I'm out of S2. I have a lot of rolling hills during the middle part of my commute, so when running, ICE recharges battery on upgrades.
#27
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