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Auto Start/Stop and Brake Pedal

5K views 15 replies 11 participants last post by  Jim_in_PA 
#1 ·
This thread is really to discuss how to get the most out of Stop/Start. If you don't like it, there are other thread to b$tch about it.

So I'd appreciate it if this is not yet another advertisement thread for OBD port gadget to override the Stop/Stop setting. There is already a few threads discussing that tool.

I really don't mind the Auto Stop most of the time. But if I know I'm going to immediately start again. It's just a wasted cycle. But if I'm sitting at a very long light it does save gas. I also don't like it stopping if I just worked the engine hard and it needs to run to cool things down. Other than those two cases it works fine.

After having this for 1500 miles now I noticed a couple things I have not seen mentioned.

1) The Brake Pedal has more than one switch (or poles). The Auto Stop is NOT triggered on the brake light switch. The Auto Stop is at a different position on the Pedal. Now this could just be mechanical tolerances and some instances might Actuate the Brakes Light, Before, After or at the Same time as AutoStop.

To test this I turned on the Backup Camera (manual button) at night so I could see the brake lights come on easily. If I very slowly press the brake pedal, the Brake Light will come on and the Vehicle will stop (on Level surface). I can keep my foot here indefinitely and the engine will not stop. As soon as I push my foot a little further the Engine shuts down. This makes sense as they are probably independent circuits. It could be the same switch that cancels cruise control as well.


Another thing is, you do get braking before you hit that Auto Stop switch. Not a lot, but enough if you are on an incline or level surface. If you are on a decline there is not enough braking to hold the vehicle and keep engine running.

But knowing this I can decide on a case by case basis if I want it to stop the engine or not. You can brake as hard as you want. You just decide how far to let up if you want engine to stay running or not.

Again both the braking action and the trip point of each switch may vary vehicle to vehicle. I did have a quick look and it is one physical multipole switch. I was hoping it was separate so you could widen the gap a little more between braking and stopping motor (it's fairly narrow).

I've also noticed that sometimes there is like a 2 second delay with full braking before the engine stops. And other times it's immediate. I have not figured out what situation causes that difference in behavior.

It really does save gas. I was up in the high 20's AVG MPG after a long trip and pulled up to a light. I could see the MPG dropping continuously as I sat there waiting. And of course as soon as I pushed my foot the whole way the dropping immediately stopped. It's pretty cool to see that it isn't a complete waste.
 
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#2 ·
Instead of a brake switch, or a multi-pole switch, the sensing appears to be done by a brake pedal travel sensor, which provides a continuous input to the computers in the vehicle, much like a throttle position sensor.

Also, a clarification. My product is not an ESS override. It simply changes the ESS start-up default to the driver's preference.

I agree with you that ESS has value, particularly in stop-and-go traffic and it really does save gas. As you implied, the reasons people dislike it have been well enough documented in other threads.

And yes, you can also control ESS pretty well with some practice with your braking technique.
 
#3 ·
Travel Sensor makes sense. If it was that, I wonder why they would separate Brake Lights from Auto Stop position?

You can think of your device as an "Override", it overrides the default behavior of turning it back on, on each start to be what it was when it was turned off.
 
#5 ·
I really don't mind the Auto Stop most of the time. But if I know I'm going to immediately start again. It's just a wasted cycle. But if I'm sitting at a very long light it does save gas.
I generally like it. What ruffles my feathers is when I pull into a parking spot and it shuts down as soon as I stop. I put it in park and it starts back up to shut off. Either that or I subconsciously take my foot off the brake after hearing it shut off which causes it to start back up. Need to pay more attention to it to figure out what's going on. May resort to hitting the disable button when parking so I can avoid starting it to stop it.
 
#8 ·
I don't like it shutting off at a stop sign. After coming to a complete stop, there should be a stop sign delay of a few seconds, like 5. I also agree about the parking issue when it shuts off while you put it in park, only to start back in park. Again the delay would fix this issue. Maybe as simple as a re-program. Makes you wonder why this was not worked out before they released it.


Sent from my iPad using JeepGarage
 
#9 ·
I don't like it shutting off at a stop sign. After coming to a complete stop, there should be a stop sign delay of a few seconds, like 5. I also agree about the parking issue when it shuts off while you put it in park, only to start back in park. Again the delay would fix this issue. Maybe as simple as a re-program. Makes you wonder why this was not worked out before they released it.


Sent from my iPad using JeepGarage
Many companies use "potential" customers to test new systems. FCA lets you buy it first and then act as a test dummy. After enough complaints they might fix something. I'm pretty sure all their engineers are Amish, so never actually drive a Jeep. :lol:


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#11 ·
Week 2 of my new 2017 Overland and I'm loving it but one thing is bugging me. I have a tight garage and pull in slowly, inching forward and stopping before I hit anything. The auto start stop shuts the engine down, only to start it back up for a second as I shift from Drive to Park at which point I shut everything down.

There must be a trick to avoid that. Anyone have any recommendations other than manually turning off Auto start stop each time I pull into the garage?
 
#14 ·
To avoid start/stop while parking; take off your seatbelt before pulling in to your parking spot. ESS deactivates when you're not using your seatbelt.

I don't advocate this, because it's dangerous and illegal, but to avoid the ESS I disabled the seatbelt chime and just don't wear my seatbelt to avoid forgetting to turn off ESS. As soon as my ESS device arrives, I can begin to wear my seatbelt more often again.
 
#16 ·
Of course, unhooking your seat belt before being fully parked exposes you to risk from the "idjuts" that think parking lots are super highways... ;) While that's not going to apply in your own garage (hopefully) it can be of concern elsewhere.
 
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