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Adaptive Cruise Control not finding semi trucks

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172CR

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Discussion starter · #1 · (Edited)
Curious if anyone has had issues with their adaptive cruise control (ACC) not registering as seeing a semi truck ahead? This seemed to affect the Ridgeline at higher speeds, I'm not sure if it was because the semi was moving (relatively) so much slower or not but it had a terrible time registering a semi truck. It was able to pick up a passenger car with no issue, MUCH further in advance than a semi as well.

If I wasn't coming from a TLX - advance with this feature knowing how far that car registered ANY object, I wouldn't be as concerned but with this, it was really bedding the brakes to slow down when following a semi because it picked it up sooooooo late.

Here's a video and does show it registering JUST prior to us having to move out of the lane or manually press the brakes;
https://youtu.be/yij0s7ntPjo
 
#2 ·
Is the vehicle icon for the ACC filling only on the left side, or is that because of video quality. If that is the case, something is wrong with your sensors.

Time to go to the dealer.
 
Discussion starter · #3 · (Edited)
njamesj said:
Is the vehicle icon for the ACC filling only on the left side, or is that because of video quality. If that is the case, something is wrong with your sensors.

Time to go to the dealer.
Click to expand...
Not quite sure what you mean, the ACC vehicle icon is on the right side of the gauge bezel when it's activated along with the Lane Keep Assist. The icon did pick up the semi right before we changed into the left lane at the last second.
 
#4 ·
Don't have an answer. But I wonder if weather condition played a role (looks like maybe there was a rain). If ACC uses a combination of RADAR (Grill Logo) and Monochrome Imaging (roof-line camera). Perhaps the camera view was obstructed?

But, if I had to speculate... it "appears" you are on a slight incline and approaching right hand curve. Two ingredients that makes for the sensors to miscalculate.

Maybe it's all things combined. Crazy.
 
#5 ·
If you end up going to the dealer good luck! My radar failed and it took them 4 days to figure it out and it was misaligned when I got it back. Couldn't see the car in front of me only the car in the right lane.

Was a horrible service experience and at least my local dealer didn't know how to align or fix the sensor.


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#6 ·
Bad area! Last year on that Utah/Idaho border an ISP officer was mostly hidden in the median. As I past by with my WAZE engaged, he raised his middle finger to great me to Idaho..
 
Discussion starter · #7 ·
Nervey said:
Don't have an answer. But I wonder if weather condition played a role (looks like maybe there was a rain). If ACC uses a combination of RADAR (Grill Logo) and Monochrome Imaging (roof-line camera). Perhaps the camera view was obstructed?

But, if I had to speculate... it "appears" you are on a slight incline and approaching right hand curve. Two ingredients that makes for the sensors to miscalculate.

Maybe it's all things combined. Crazy.
Click to expand...
Agreed, it could have been a combination of things. It was lightly raining in the video but the rest of the trip was dry and still experienced the same thing. We'll see how it goes, I have a feeling it was the speed difference.

chrisnack said:
If you end up going to the dealer good luck! My radar failed and it took them 4 days to figure it out and it was misaligned when I got it back. Couldn't see the car in front of me only the car in the right lane.

Was a horrible service experience and at least my local dealer didn't know how to align or fix the sensor.


Sent from my iPhone using Tapatalk Pro
Click to expand...
That sounds terrible!
 
#8 ·
172CR said:
Curious if anyone has had issues with their adaptive cruise control (ACC) not registering as seeing a semi truck ahead?

-snip-

Here's a video and does show it registering JUST prior to us having to move out of the lane or manually press the brakes;
https://youtu.be/yij0s7ntPjo
Click to expand...
I'm not seeing a technical problem in the video. Though admit that this is my first vehicle with the feature.

You have the adaptive distance set to only 2 bars which is on the short end, and it does pick up the semi on your 2nd "Jesus". It would have slowed and possibly engaged collision mitigation braking if needed and enabled.

These are "driver aids" and not made for autonomous driving, so you took the correct action as the driver to intervene for your comfort and peace of mind.

If you weren't overtaking that truck so fast, and/or had the adaptive distance set to 4 it would have slowed sooner. If you're not noticing a difference when you set the adaptive distance out to 4 bars, then you may need to get the radar unit adjusted or just tilted up a bit.
 
Discussion starter · #10 ·
HazzMattPDX said:
I'm not seeing a technical problem in the video. Though admit that this is my first vehicle with the feature.

You have the adaptive distance set to only 2 bars which is on the short end, and it does pick up the semi on your 2nd "Jesus". It would have slowed and possibly engaged collision mitigation braking if needed and enabled.

These are "driver aids" and not made for autonomous driving, so you took the correct action as the driver to intervene for your comfort and peace of mind.

If you weren't overtaking that truck so fast, and/or had the adaptive distance set to 4 it would have slowed sooner. If you're not noticing a difference when you set the adaptive distance out to 4 bars, then you may need to get the radar unit adjusted or just tilted up a bit.
Click to expand...
I know what you're getting at but that's not entirely correct with how the ACC works. The silhouette will pick up a vehicle ahead within a certain set distance, which I believe is 200 yards straight on, regardless of the follow distance set. Just because I have the follow distance quite short doesn't mean it won't recognize the vehicle at all until it applies the braking. Having two TLX's with the feature, and the Ridgeline operating identical to the TLX's with a normal private passenger car, it seems odd it picks up the larger vehicles so late.

But I do agree with the technical aspect, this is likely working as designed and it's having to do with speed I'm approaching a slower vehicle.

I did text the video to a friend who is a service manager at a local Honda dealership in Portland who thought the truck should have picked up the semi well in advance of when it did as well. His initial thought was the radar (or lidar) is focused under the truck which would explain why it can see a passenger vehicle normally as the ground clearance is much shorter than the larger semi.

I'll report back after he takes a look at the direction the radar is pointing.
 
#11 ·
4 bars is an insane distance. I run one bar and it still pretty far. It's also pretty touchy if a car pulls out too close then you'll get a seatbelt check.


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#12 ·
172CR said:
I know what you're getting at but that's not entirely correct with how the ACC works. The silhouette will pick up a vehicle ahead within a certain set distance, which I believe is 200 yards straight on, regardless of the follow distance set. Just because I have the follow distance quite short doesn't mean it won't recognize the vehicle at all until it applies the braking. Having two TLX's with the feature, and the Ridgeline operating identical to the TLX's with a normal private passenger car, it seems odd it picks up the larger vehicles so late.

But I do agree with the technical aspect, this is likely working as designed and it's having to do with speed I'm approaching a slower vehicle.

I did text the video to a friend who is a service manager at a local Honda dealership in Portland who thought the truck should have picked up the semi well in advance of when it did as well. His initial thought was the radar (or lidar) is focused under the truck which would explain why it can see a passenger vehicle normally as the ground clearance is much shorter than the larger semi.

I'll report back after he takes a look at the direction the radar is pointing.
Click to expand...
Ah, thanks for that clarification about how/when the silhouette lights up, vs the following distance. Yeah I hope it's as simple as aiming it up a bit then. Look forward to your results!
 
Discussion starter · #13 ·
HazzMattPDX said:
Ah, thanks for that clarification about how/when the silhouette lights up, vs the following distance. Yeah I hope it's as simple as aiming it up a bit then. Look forward to your results!
Click to expand...
Totally! Who knows, maybe that's just how it works on the ridgeline too!
 
#14 ·
My dealer said each bar is 70 ft. I agree, now that I have driven it and played with the distances. So at 2 bars, you are looking at about 140 ft and at 80 mph, not nearly enough distance to help. That is 117 feet per second...and you were going faster then 80. You could have changed lanes much earlier, were you looking to test the braking?
 
#15 ·
Shineaholic said:
My dealer said each bar is 70 ft. I agree, now that I have driven it and played with the distances. So at 2 bars, you are looking at about 140 ft and at 80 mph, not nearly enough distance to help. That is 117 feet per second...and you were going faster then 80. You could have changed lanes much earlier, were you looking to test the braking?
Click to expand...
70' sounds about right but that is the distance it will keep, not detect. Detecting comes on much earlier, the vehicle gradually slows down until it sits around 70' away assuming you have selected 1 bar.

That being said, I find the system to be much too nanny like. Detection is much too early even on 1 bar. As an example, if I am approaching a slower moving car, I need to move to the other lane with what seems like 400+' or my car will start to slow down. When the vehicle in front is out of the way, it takes too much time before it starts to accelerate back to speed which is probably a good 5 seconds. I do drive 2 other vehicles with adaptive cruise and must say both are much better at mimicking a real everyday driver. I cannot, imagine anyone using the farthest distance which I think is 5 bars.

Back to the OP. I drive the Trans Canada between Montreal and Toronto on a regular basis. This is a major 2 lane truck route with big rigs making up a big chunk of vehicles on the road. Never have I seen the cruise not pick up the truck however the road is pretty much flat all the way.
 
Discussion starter · #17 ·
Thanks for the post;

Again has nothing to do with the set interval distance and the brakes being applied. I know some have brought this up numerous times.

It has to do with when the truck first DETECTS the vehicle ahead of it, not the distance allowed regarding the interval bars. As in the pdf, the car silhouette is filled with a car... meaning it can detect a vehicle in front of it regardless of the distance intervals. The truck picks up a car in front just fine, well in advance of any interval bar.

I'll take another video to show what I mean. If I'm on a straight freeway with 2 lanes heading in one direction and there is a car in the left lane and a semi in the right lane 200 ft ahead, the car will be detected without problem, and I move into the right lane behind the semi won't be detected until I'm much closer.
 
#18 ·
njamesj said:
The dealer is wrong...the ACC following distance is based on the time factor, not distance in feet.
Click to expand...
This is exactly what I thought and was looking for, but you beat me to posting. Still, 1.1 seconds to 2.8 seconds is on the tailgating side. I was taught, and I think they still teach, that on dry clear roads (ideal conditions) there should be a two second interval between the front of your vehicle and the back of the vehicle you are following. That should increase to three seconds in poor weather (rain) and four to five seconds in winter.
 
#20 ·
172CR said:
Thanks for the post;

Again has nothing to do with the set interval distance and the brakes being applied. I know some have brought this up numerous times.

It has to do with when the truck first DETECTS the vehicle ahead of it, not the distance allowed regarding the interval bars. As in the pdf, the car silhouette is filled with a car... meaning it can detect a vehicle in front of it regardless of the distance intervals. The truck picks up a car in front just fine, well in advance of any interval bar.

I'll take another video to show what I mean. If I'm on a straight freeway with 2 lanes heading in one direction and there is a car in the left lane and a semi in the right lane 200 ft ahead, the car will be detected without problem, and I move into the right lane behind the semi won't be detected until I'm much closer.
Click to expand...


It's fine left to right? It must be aimed low and doesn't see the "bulk" of the truck until you are closer. I follow you as yes the distance bars and everything is irrelevant if it isn't picking up the vehicle in front and you don't get the vehicle symbol.

How does it do with motorcycles? Mine picks those up just fine. Curious if you are misaligned how motorcycles show up.


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172CR
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