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Glide Mode Made Simple ?


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#1 CO2SLAVE

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Posted 22 June 2012 - 11:03 AM

Hi Everyone ,

just wondering if it is possible to have an automatic glide mode to improve economy even further ...

I have read previously that optimum economy is obtained by minimal use of the regen system and gliding in a state where the regen is not working and the engine is off .

This state is virtually impossible to maintain as the throttle position needs to be held in the correct position to a millimetre ! ( In an Auris HSD at any rate - the prius may be easier ?)

But has anyone found a way to set the throttle position so that off is effectively the glide position ?

I realise that you will not have any engine ( not really engine but regen) braking effect when you lift off but you can brake to have regen when you want anyway.

there may be a simple way of adjusting the accelerator position so that the fully lifted off position is slightly on but I guess that will not be that easy as throttles these days are not really mechanical cable operated devices as they used to be years ago .

Any ideas people?

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#2 ColinBarber

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Posted 22 June 2012 - 05:54 PM

other than hacking into the electronics and reprogramming the ECU I guess the only way would be to either mechanically stop the throttle pedal from fully coming back to the rest position or misadjust the throttle pedal position sensor. It would certainly be safer to do the later but I wouldn't recommend either from a safety point of view. It also may cause an issue when stationary - you will have the throttle pedal slightly down which may keep the engine running or apply electric power to the motor and you then end up wasting more energy than you save by gliding more.

I've not driven the Auris, I guess it must have a very short throttle pedal travel? I don't have a problem resting my foot on the pedal to maintain a glide on either a Prius or a Lexus 400h

#3 Grumpy Cabbie

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Posted 23 June 2012 - 02:38 PM

I believe the situation you refer to was more achievable on the gen2 2004-2009 Prius. It was much harder to achieve on the gen3 Prius, so as the Auris HSD is based heavily on this, I assume it is the same.

Basically use of the electric on its own should be avoided in most situations as this energy has to be put back and usually that is by burning more petrol. To get the super best economy you're best just driving as lightly as possible; a good description would be to drive as if you had no brakes - drive gentle and coast to a stop when safe to do so. Don't try and keep the car in electric only, just drive steady and let the car sort itself out.

#4 GerryJ

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Posted 23 June 2012 - 03:55 PM

I normally have the car in Eco mode when I do this on my Prius and I have not had a problem. What mode are you in?

#5 CO2SLAVE

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Posted 24 June 2012 - 01:42 PM

other than hacking into the electronics and reprogramming the ECU I guess the only way would be to either mechanically stop the throttle pedal from fully coming back to the rest position or misadjust the throttle pedal position sensor. It would certainly be safer to do the later but I wouldn't recommend either from a safety point of view. It also may cause an issue when stationary - you will have the throttle pedal slightly down which may keep the engine running or apply electric power to the motor and you then end up wasting more energy than you save by gliding more.

I've not driven the Auris, I guess it must have a very short throttle pedal travel? I don't have a problem resting my foot on the pedal to maintain a glide on either a Prius or a Lexus 400h



#6 CO2SLAVE

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Posted 24 June 2012 - 01:47 PM

other than hacking into the electronics and reprogramming the ECU I guess the only way would be to either mechanically stop the throttle pedal from fully coming back to the rest position or misadjust the throttle pedal position sensor. It would certainly be safer to do the later but I wouldn't recommend either from a safety point of view. It also may cause an issue when stationary - you will have the throttle pedal slightly down which may keep the engine running or apply electric power to the motor and you then end up wasting more energy than you save by gliding more.

I've not driven the Auris, I guess it must have a very short throttle pedal travel? I don't have a problem resting my foot on the pedal to maintain a glide on either a Prius or a Lexus 400h


Yes to maintain a glide in a Auris HSD is quite difficult even in ECO mode As I understand it you need the power flow indicator to show no power flow to either battery or wheels. I am not sure if it will affect the low speed operation of the throttle

#7 CO2SLAVE

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Posted 24 June 2012 - 01:55 PM

I believe the situation you refer to was more achievable on the gen2 2004-2009 Prius. It was much harder to achieve on the gen3 Prius, so as the Auris HSD is based heavily on this, I assume it is the same.

Basically use of the electric on its own should be avoided in most situations as this energy has to be put back and usually that is by burning more petrol. To get the super best economy you're best just driving as lightly as possible; a good description would be to drive as if you had no brakes - drive gentle and coast to a stop when safe to do so. Don't try and keep the car in electric only, just drive steady and let the car sort itself out.

I think you may have misunderstood as i am not advocating the use of electric mode The idea is as you say to minimise the generation of regen. ( which is only about 50% efficient) and glide without using the engine or battery power. This is where the big economy gains can be made. The only difficulty for me is maintaining the glide position on the throttle as it is super sensitive.
So if I can find a way to maintain the glide position when lifting off the throttle this will surely help the economy?

#8 Grumpy Cabbie

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Posted 24 June 2012 - 05:08 PM

Then purchase the scanguage II as this gives the indication of when the glide mode occurs. I understand it is harder to achieve in the gen3 than the gen2 though like you say, a very steady and light foot helps keep it just there. I've had it happen for only a few seconds on a flat road but there is another way of thinking in that glide mode doesn't really occur at all as it is just the switching from one to the other which is delayed on the gen2's screen.

I see from your mpg figures that you are a bit of a hypermiler. Have you considered an enginer plug in kit? That'll really help your mpg figures and be fun too, though it might cause warranty issues and isn't for people without an electrical engineering background.

#9 CO2SLAVE

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Posted 25 June 2012 - 10:55 AM

Then purchase the scanguage II as this gives the indication of when the glide mode occurs. I understand it is harder to achieve in the gen3 than the gen2 though like you say, a very steady and light foot helps keep it just there. I've had it happen for only a few seconds on a flat road but there is another way of thinking in that glide mode doesn't really occur at all as it is just the switching from one to the other which is delayed on the gen2's screen.

I see from your mpg figures that you are a bit of a hypermiler. Have you considered an enginer plug in kit? That'll really help your mpg figures and be fun too, though it might cause warranty issues and isn't for people without an electrical engineering background.

I think you may be right on the non existent glide mode because it only does it for a second or so. I have been looking around on the forums and I don't think anyone has succeeded in doing this yet. A better idea would be a cruise control that holds throttle position rather than speed. This would do the same thing as the glide but you could also use it for cruising economically too!!
The engineer kit is a no go because the car is owned by the company and they wouldn't go for that. I would be a bit short on the electrical skill side too. Might consider a scan gauge when I can get some spare cash together.

Has anyone seen a mod for the cruise control ?
Apparently some peugeots had a dual cruise which you could choose wether to maintain speed or throttle position

#10 Joseph D

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Posted 26 June 2012 - 08:40 AM

Has anyone seen a mod for the cruise control ?
Apparently some peugeots had a dual cruise which you could choose wether to maintain speed or throttle position


I don't believe this will work, because to maintain the glide you need to release pressure on the accelerator ever so slightly as your speed bleeds off. If you do not do this, you will have the electric motor come on to maintain speed, and you will be no longer gliding at this point.

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