Prius (2010-12) Fuel :: Pulse And Glide At Constant Speed?
Aug 16, 2010
Two weeks ago we were driving across rolling hills in southern Ohio. I started to wonder, "What would be the perfect road for the Gen 3 Prius?" Is there a road shape that would allow the benefits of pulse and glide without the speeding up and slowing down?
Let's assume no net elevation change on an interstate highway and a driving speed of 60 or 65 mph. To stay in the most fuel efficient engine ranges for the ICE, we'd want down-hill stretches where the power demand shown on the hsi would be in the bottom 1/4 of the total Echo range, and up-hill stretches where we could stay in the top 1/4 of the hsi Echo range (just below Power).
Would the optimal ascent and descent angles be the same, or would the angle of decline be shallower that the assent angle? Would mileage (mpg) be better on this ideal up and down road than mileage on a flat road at constant speed?
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I own a Prius C 2013. I read about Pulse and Glide, and I also watched youtube about it. I somehow have never seen a situation where there is no arrow in the Energy Monitor. The best I have ever seen is arrow coming out of the battery only which is EV mode. Some people say 35-45 is the best speed for P&G, but I never see "no arrow". What speed makes the car run without arrow?
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Correct me if I'm wrong - Pulse & Glide is not really possible at speeds higher than, say 120-130km/h (74-80mph). I have noticed on my last trip that if you want to keep 130km/h average and you pulse up to 140km/h and glide down to 120km/h, when "gliding" the engine never shuts down, and the glide period is very short.
When pulsing back to 140km/h it takes a "long" time and the instant fuel consumption is "high" (e.g. 6-7L/100km) while when "gliding" you are actually at 2-3L/100km, which means on average you are at about 5L/100km, which is what I would get in any case if keeping speed constant with the CC at 130km/h.
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While pulse and glide, is it better in Eco mode or normal mode with Prius c?
Eco mode will take more time to pulse, it may lower mpg?
Nexus 7 ?
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I am a new 2010 prius owner and I am very interested in obtaining the max MPG in my new car I have read and seen video with regard to the pulse and glide method. My question is
1. can you shift into neutral on the glide
2. can this do any harm to the car.
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I have great success doing pulse and glide in city. I once drove 32 miles non highway at 90mpg in a single trip using this technique. But it seem that it is impossible to do so on the highway, speed goes down too fast during glide. I found that too many pulses on highway actually decrease mpg. How to greatly improve mpg in highway driving?
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As I understand it pulse and glide should work at pretty much any speed. I'm trying to adopt pulse and glide but I drive on mostly 55 MPH hilly roads. If I'm in HV mode and have some EV range I find I can only get ICE shutoff below 42+/- MPH. However if I switch to EV mode as I back off the pedal the ICE will shut down at speeds up to 62+/-MPH. Switching from EV to HV while gliding at speeds above 43 MPH causes the ICE to resume turning. So I've tried accelerating to my desired pulse speed in HV coordinating releasing the pedal with selecting EV mode to begin the glide then beginning the next pulse by simultaneously pressing the pedal and mode button. Alternatively I can stay in EV mode for the glide then floor the pedal to restart ICE but that risks getting an undesired higher less efficient ICE power level and doesn't allow lower power pulses to allow glides to begin on downgrades.
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I'm talking basically about the equivalent of your standard pulse and glide in the regular Prius. But the PiP would allow you to do it up to 62 mph. However, you would manually have to toggle the HV/EV button to do it. It would be tiresome.
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Brand new 2015 Pruis two.... Still on 1st tank of gas. Can't get it to glide for more than a second or two generally. I'm experienced at the technique from owning a 2006. Could regularly get 50-60 mpg in that car. New 2015 won't let me glide. Today I had a minor breakthrough when it let me glide for 9 whole seconds! Mostly it bounces me between "charging" and "EV" without giving me a true glide. 1st tank is set to deliver a lackluster 39mpg.
I'm not too worried about that yet because I've spend some time sitting the car (with air) learning all the controls that have changed since 2006. Couple of things I'll try next: I have not driven too much in ECO mode yet... mostly just regular mode. Normal commute 24mi round trip mostly highway. I'll check the tires next trip and the parking brake when I run an errand in a minute. Also whether maybe there was a current software upgrade that's suppressing this?
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When I drove my 2012 Prius 3 today, the fuel indicator was flashing as I had about 20 miles until empty. I was on my way to get gas when suddenly, the horn was honking as if the alarm was going off. Nothing I did seemed to stop the horn, even clicking the unlock button on the key fob. Intermittently, the horn would stop, then start up again in a stuttering fashion, only to be followed by the incessant honking I mentioned earlier. I have a video of this but it must be too large to upload.
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I have a 2010 with about 166k miles. I am getting a slight hesitation at slight acceleration or constant speed. It does not matter if it's on highway or freeway speeds. Now I am not sure if this in junction with me changing the PCV valve, cleaning the EGR pipe, or cleaning the TB for carbon recently. It started happening a week after it though.
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When I first bought the car I was resetting the trip/mpg every day and getting a daily reading. Then I started to realize that wasn't accurate as a per tank reading. So now I judge my weekly trip/mpg. Currently I am getting 57-59 mpg on the MFD(I do not have a scangauge yet) - so i guess that would equal 54-57 actual.
My commute is 43 miles one way. half of it is mixed city driving a mile of low speed out of my neighborhood to a 55 mph with two 2 mile 35 mph zones and then the second half is interstate.
I have been working on keeping the SOC high for the 55 mph so that i can most of the time slip in and out of high speed "stealth" mode. Usually with the MFD around 69-75? and not drop speed too quickly. maybe a mph per 2 miles depending on the grade.
I try the pulse and glide in the 35 mph zones. coast in, then glide as far as I can and pulse back up. I have been playing with a couple ways,
OPTION 1: use in electric only-takes longer and kills SOC.
OPTION 2: Pulse hard into el+ICE and its crap mpg for a small amount of time. Pulse gently into ICE and decent mpg for a little longer amount of time.
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Just bought a 2010 Prius IV and loving the car.
Minor annoyance, but wondering why it's so difficult to get the car to enter or stay in EV mode.
When I'm able to get into EV mode, it often beeps that it's leaving EV mode due to excessive speed, but I'm often doing barely 10 mph when this happens. I was under the impression that I could do up to 25 mph. Yesterday, I was floating at 8 mph and it said that was excessive speed.
More often, though, I can't even get into EV mode. It says "EV mode currently unavailable" and why. Doesn't matter if I'm not moving or if I'm driving slowly.
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Traffic permitting, pulse and glide or coast seems to work for the mpgs for those dreaded 1 mile trips on a cold engine. If no one behind, I'll just get off the gas and coast down the street, usually to the next stop light. Funny how often the light is red. If a bunch of ICEers are close behind, coasting not an option.
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I normally run my climate control in manual mode, and I notice that my blower doesn't always run at a constant speed. I know that if you use the Auto setting the fan will change speeds, but I didn't think it should do that if you are using a manual setting. Is that right?
I was thinking I would make an appointment with the dealer to check it out. But didn't want to do that if this is normal behaviour.
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Fuel mileage dropped from 52 to 40 on several hot days and I heard a constant loud hum. In the shop tomorrow.
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I have a f53 motorhome and 4 out of the 8 injectors pulse. The front 2 and the back 2 don't pulse. The middle 2 on both sides work perfect. Why would they not pulse and only give out positive on the two wires to the injector on the one that don't work. The ones that work they pulse.
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I have a 2013 Prius 4. I'm not sure if there is a problem or not but the heater just seems to blow the same temperature of air no matter how high I set the temperature. The air feels lukewarm. I was driving 60 miles yesterday with the temperature set at 76. I had on a long sleeve shirt and polar fleece jacket and it never got to where I was really warm. Outside temp was about 50.
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I got a problem with the injectors there getting power but no pulse, what do i need to do to trace the problem, not sure what to do next!
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I've had an issue with my 08' for a few weeks after returning from a 1 week vacation with the car sitting on the street in NYC. The symptoms are a noise associated with poor performance of the vehicle. It accelerates slower and requires more RPM. When you take your foot off the accelerator it feels as though there is a brake on or some additional drag somewhere in the front end. It's really evident that it doesn't actually glide, but it decelerates rapidly.
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04 6.0 with no FICM sync and no fuel pulse width. Crank/cam sync yes. All other data is good. Tried known good FICM and PCM but nothing. Had glow plug codes thats it. Found chaffed wires due to mice. Replaced damaged Injector harness still nothing. Fuel pressure is good btw.
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