Cruise control got dangerous when on curve.

[Nikhil Malhotra]

I was about to rear end another car today due to confusion by the cruise control system.

Going at around 65mph and traffic turned slow , so we were all at around 40 mph or so . When a curve came the cruise control thought there is no car ahead of me , and started accelerating . It should have sensed that the steering was not straight at the curve and i was turned towards left.

I had to hit the brake hard , and then press the cruise button on the steering to switch it off .

Risky. I dont think there is anything unique here in the genesis , my guess is all cars with adaptive cruise control would have behaved in a similar fashion .

 

[Mr. Incredible]

read the manual, it specifically addresses this..

2018 manual it is on pages 5-89 to 5-91

 

[Mr. Incredible]

also hitting the brake immediately disables the SCC, if yours is not then you have other concerns that a dealer needs to address.

SCC IS NOT tied into the steering, it is merely a sonar sensor at the front of the vehicle. LKA is a complete separate and independent system.

I have several curves of nature described in the manual on my commute, interchanges to other highways and the like, I always reduce the SCC speed from 65-70 to the curve speed a few hundred yards before the curve, usually it is 30mph, if I need to go faster I use the accelerator, this over-rides the SCC, but when I remove my foot it will only slow the car to the set speed (30mph), this prevents the car from accelerating to 65mph on its own in these situations, but allows the SCC to maintain the posted curve speed if there is no reason to speed up.

I am constantly adjusting the set speed via the hand controls for various situations, I enjoy using the SCC because it takes a lot of the stress out of my drive, but I am well aware of its limitations and the need to be attentive.


SCC is a fine tool for long straight drives, but it is NOT auto drive and it requires user intervention in many situations, like curves, changing lanes, passing, sudden stopped traffic, etc.

 

[Nikhil Malhotra]

wow ... reading this on the manual is one thing. Experiencing it is scary .

Car was so fast in acceleration ... it surprised me . It felt it was a split second.

 

[Nikhil Malhotra]

also hitting the brake immediately disables the SCC, if yours is not then you have other concerns that a dealer needs to address.

Yes i think at the moment i just hit the brake and the second thing was to press the CRUISE button on the steering to turn the system off . You're right that it would have disabled automatically. I will surely try this out on a empty road.

 

[Mr. Incredible]

wow ... reading this on the manual is one thing. Experiencing it is scary .

Car was so fast in acceleration ... it surprised me . It felt it was a split second.

not sure on the 2015-2016, but for the 2018 there is an option to adjust the acceleration for SCC from Slow - Normal - Fast. mine is set to slow, which is sometimes irritating (especially to other drivers), because it chugs along to get back to speed, but I feel it is safer:

 

[Nikhil Malhotra]

I'm not sure , but it appears the cruise control was not aware of the shoulder wall .
The freeway has a approx 4 feet wall on the right edge. I could have gone into the wall if my steering was not turned .

What is the range of the sensors ? I read somewhere that the radar operates at 77GHz frequency band .
Some of the systems like the bosch LRR4 can detect anything withing 80 - 250 meters.

 

[EdP]

I'm not sure , but it appears the cruise control was not aware of the shoulder wall .
The freeway has a approx 4 feet wall on the right edge. I could have gone into the wall if my steering was not turned .

Yes, you have to look out the window and steer. It is a great feature that I use often, but it has limitations.

 

[Suburbazine]

I'm not sure , but it appears the cruise control was not aware of the shoulder wall .
The freeway has a approx 4 feet wall on the right edge. I could have gone into the wall if my steering was not turned .

What is the range of the sensors ? I read somewhere that the radar operates at 77GHz frequency band .
Some of the systems like the bosch LRR4 can detect anything withing 80 - 250 meters.

Radar cruise CANNOT see walls. If it's not moving it's invisible. If it's not moving fast enough it's invisible.

If you were to enable detection of immobile objects the car would freak out over all immobile objects. It can only see one dimension (Z-axis), which is to measure distance of any single object within a cone. It cannot see multiple objects (or X/Y axis), filtering removes spurious distance measurements to enable tracking a single target. Advanced filtering gives you a Doppler effect which is tracking multiple objects along that single plane. It can't tell if they're left/right/crossing etc.