Energy Management

Discussion in 'Experienced Truckers' Advice' started by Hammer166, Dec 3, 2017.

  1. Hammer166

    Hammer166 Crusty Information Officer

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    So... I spent the first part of the month training a new guy. He had 4 years of experience, but no mountain experience at all, and was definitely uptight about going over Loveland Pass. I was stuck in the right seat, and a thought occurred to me as I watch him make lots of simple mistakes on the grades. I had noticed it with other inexperienced drivers, but it never struck me as it did that day. And that was their poor energy management.

    Pilots live and die based on their energy management (@tscottme ,@MooneyBravo and other pilots here can attest to this.) But that day, for some reason, it really jumped out at me just how often an experienced driver used it to their advantage, making their life easier, using it to help rather than hinder.

    A big part of energy management is being ahead of the truck, proactive and not reactive. What I noticed that day was how often he unnecessarily used his throttle and brake, rather than using the terrain to help keep his speed where he wanted it. Coming up to steep downgrade that's proceeded by a very short steep upgrade, my question to him: " Why are you slowing down at the base of this hill? You're now going to need throttle to make the top!" But he was behind the truck, not seeing what was in front of him. All he saw was the "Steep Grade Ahead" sign, and had to fight gravity with fuel rather than use that gravity to bleed off energy as he coasted up the hill.

    Same thing going downgrade, he failed to notice the road was flattening out, and bled off 15 -20 mph that he didn't need to, and required some throttle to get his speed up to a reasonable level before the downgrade resumed. And at the bottom of the hill, same thing. Stayed in the lower gears too long instead of upshifting and hanging on the jake to allow the truck to slowly accelerate as the grade shallowed and the speed limit came back up.

    And yes, I realize that this is intuitive for some, and a concept others struggle to grasp. But that ride opened my eyes to just how often I've used terrain, rather than fuel or brake pads, to help me get my truck speed where I wanted it. So much so that it took a ride with someone who didn't use those techniques to let me see it. For most of you experienced drivers it's almost an innate thing, mainly because we tend to be well out in the front of the truck. For you newer guys, it's another incentive to work on moving your attention further ahead, it will not only make your driving easier and smoother, it does wonders for your spatial awareness. Surprises become much less commonplace, making accident avoidance a routine thing instead of a panic situation.

    And trust me on this, if there is any one thing that separates a true driver from a guy who drives trucks, it's proactivity. You won't find any million mile+ safe drivers who spend their time behind the truck, always reacting. Get out front, and stay out front!
     
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  3. Pedigreed Bulldog

    Pedigreed Bulldog Road Train Member

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    That right there is why an experienced driver will get better fuel mileage in the hills using his right foot than the cruise, because like the inexperienced driver you described, the cruise is reactionary and not proactive.
     
  4. STexan

    STexan Road Train Member

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    That's not as true as it used to be given the current generation cruise systems, coupled with auto transmission that have a digital terrain database of most major roads and the computer is "looking ahead" and is doing the things you're describing (backing out optimally and applying power at optimal time and even engine braking on significant grades with varying angles in a "smart way"). Also, eCoast and overspeed allowance. They're pretty "smart" and don't knock them until you've tried them.

    Edit: These new systems also factor in estimated gross weight based on suspension pressure. But they are not any good at determining and adjusting for significant wind impacts
     
    Last edited: Dec 4, 2017
    MooneyBravo, Joetro and Hammer166 Thank this.
  5. HighwayD

    HighwayD Light Load Member

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    Great Post. Very informative, a great lesson for newer drivers and a great reminder for more experienced drivers.
     
  6. tscottme

    tscottme Road Train Member

    Good post. In flying they call it "stay ahead of the airplane".
     
  7. x1Heavy

    x1Heavy Road Train Member

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    Nice post. I don't think too many schools are blessed with a mountain big enough to train on.

    During my schooling we were crossing notchcliff which was about a 10 foot wide unmarked pavement through the woods over the ridges with a full 18 wheeler. It's not something you do normally, but the instructors thought it best to put us into a situation where you are forced to learn the hill. It was fortunate that my father had run this route often when I was a child so I knew it rather well.

    Here is Notchcliff, enjoy! (Upgrade, turns to the left just beyond those trees, some of the sharpest corners on the hill.)

    Google Maps
     
  8. mustang190

    mustang190 Road Train Member

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    Up hills fast, down hills faster. Cow mobiling is the way to go!
     
    tscottme Thanks this.
  9. MooneyBravo

    MooneyBravo Heavy Load Member

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  10. TripleSix

    TripleSix God of Roads

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    @Hammer166, just being a little nosy...what exactly are you doing...just teaching guys that never ran the mountains, the do’s and dont’s?
     
  11. STexan

    STexan Road Train Member

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    I'm in my first auto ever [just the last 4 months]. Descending major mountain grades with an auto is a completely different matter then with a stick. Even the reality you can run in "manual mode" with an auto is still different and "non-intuitive", especially if you've driven nothing but sticks for 20+ years. Add in snow/ice and then it becomes more of a complex issue to discuss because running auto and running stick should really be two different discussions.

    I honestly do not know how to explain the "practical and safe way" to handle a majorly long and steep descent in an auto. There are too many factors that [can] come into play with an auto. Even auto's and powertrain combinations from different yet recent years behave differently from what I can gather.
     
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