Why doesn't cruise control work on hills?
The cruise control can't see them either. Ford's manual states: "When you are going downhill, your vehicle speed may increase above the set speed. The system will not apply the brakes. Change down a gear to assist the system in maintaining the set speed." That hill warning is there because the car companies are "worried about runaway vehicles."
Can PID cruise control maintain set speed on hills?
A perfectly tuned PID cruise control has the ability to maintain set speed on hills after a short period. During that period, when the car first starts up the hill, the car must first slow down before the controller sees that it needs to make a change to the throttle to bring the speed back up to setpoint.
Is it safe to drive with cruise control on winding roads?
It’s particularly dangerous to use cruise control on winding roads since it will enter into turns and accelerate through them at the speed on which the cruise control is set. It’s often safer and more efficient to turn cruise control off on hilly and/or winding roads.
When is it best to use cruise control?
And of course, cruise control is best used on modern, limited-access highways with no secondary roads or driveways entering from the side, with moderately-curved turns and moderately-sloped hills.
What is the danger of cruise control?
Why is there a hill warning?
Can cruise control cause transmission to overheat?
Can cruise control see road conditions?
Can cruise control see hills?
Does Chrysler have cruise control?
Do cars shift gears?
See 4 more
About this website
Does using cruise control damage transmission?
Cruise control, if used properly, is not bad for your car in the least. It can even reduce wear and tear on the engine/transmission and improve fuel efficiency by reducing instances of rapid acceleration. However, it can be harmful if used with a manual transmission or in certain adverse conditions.
When should cruise control not be used?
Don't use cruise control when it's raining, snowing, or when there are wet/icy roads in general. While some newer vehicles have features that help your car handle wet roads and rain even while cruise is on, it's best to be in total control of your car when you are driving in these conditions.
Is it better to use cruise control in the mountains?
It's also a bad idea to use cruise control when you're driving in hilly or mountainous topography, or if the roads are winding. When you set this feature, it just knows to keep your car at a constant speed.
Should you use cruise control on slippery roads?
On wet roads, cruise control set at too fast a speed could cause the vehicle to hydroplane when it encounters standing water. On very low-traction surfaces such as ice and snow, cruise control operation can result in a skid or spin. Drive safe and avoid using cruise control on slippery roads.
Does cruise control use more fuel?
Generally speaking, yes. Cruise control can help you become more fuel-efficient and can help you save an average of 7-14% on gas thanks to its ability to maintain a continuous speed. In comparison, the constant change in acceleration and deceleration of the driver placing their foot over the pedals can eat more gas.
Does cruise control hurt engine?
RAY: No, not at all. In traditional cruise-control systems, using the "reduce speed" button is just like backing your foot off the gas pedal. It's harmless.
Why should or shouldn't you use cruise control at night?
Why shouldn't or should you use cruise control while driving at night? You should not, so that you'll pay more attention to what you're doing. What type of zone is a railroad crossing? Why is it often harder to judge the speed and distance of a motorcycle?
Is it safe to use cruise control in wet weather?
Cruise control should not be used in wet conditions but there is no reasonable explanation why it would cause aquaplaning.
Should you use cruise control on a brand new car?
Don't Use Cruise Control As said earlier, a new freshly built car shouldn't be driven at a constant speed. Cruise control in a vehicle does the same. Though it is good for extracting good mileage it'll surely have a negative effect on the long run.
Can you brake while on cruise control?
You can brake while using cruise control. But applying the foot brake manually automatically shuts off the cruise settings. An alternative to stepping on the brake pedal is using the decelerate button on your car's cruise control panel. Typically, you can adjust the speed setting by tapping up or down.
When using cruise control and you are going downhill, does the ... - Quora
Answer (1 of 10): Depends on the system. My Volvo will use the brakes if the speed goes 10 mph above the set point, otherwise it just uses the engine. Depends on the hill however, if it's a very steep hill i ditch the cruise control, pull the gearbox back into a lower gear (it's an automatic) a...
Should you use cruise control when driving in the mountains ... - Answers
Im with someone in the army and we want to get married asap but would he get into trouble he is 21 and im 16
Cruise control not maintaining speed going downhill
Collected Oct 18th 2014 (loving it!!) - A3 1.4 TFSI S-tronic Saloon, Brilliant red, Parking system plus, Comfort pack, Folding door mirrors, Electric lumbar support, High beam assist, Hold assist, Interior lighting pack, Reversing camera, Through-load, Towbar.
Do cruise controls ever control speed on a downhill gradient?
My understanding was that cruise controls only control the throttle position and so a car that is set to (for example) 70 mph may exceed this speed going
If you drive with the cruise control on, how does it regulate ... - Quora
Answer (1 of 11): Interesting question…I hadn’t thought of this scenarios. Automatic transmissions will work in tandem with cruise control and downshift as needed. Engine compression assists with braking. In small inclines, that’s all that’s needed. I have a modern automatic and I imagine it woul...
How does cruise control work?
Setting your cruise control on the speed limit on a long road trip is a great way to help you maintain a safe speed and avoid a speeding ticket; however, if your travels include any winding roads or rolling hills, using cruise control can actually increase your odds of getting into an accident and even waste your fuel consumption. As you travel up and down hills, your cruise control maintains the same speed by accelerating on the inclines and braking on the decline, which can actually burn more gas than letting your car’s natural momentum carry it downhill. It’s particularly dangerous to use cruise control on winding roads since it will enter into turns and accelerate through them at the speed on which the cruise control is set. It’s often safer and more efficient to turn cruise control off on hilly and/or winding roads.
What is adaptive cruise control?
Many cars now come with adaptive cruise control technology, which automatically adjusts your car’s speed to maintain a certain following distance from the car in front of you. While this is certainly a useful safety feature on long stretches of highway driving, it can be dangerous to rely on this feature when driving in congested traffic. It’s best to manually adapt your speed to fit your driving conditions when driving through dense traffic, such as rush hour, construction zones, or slow traffic following an accident or rough weather. Even adaptive cruise control can fail to adjust quickly enough to prevent a fender bender (or worse!).
Can you relax while driving?
Relaxing too much while relying on cruise control can create a false sense of security and control which can quickly lead to serious injury if not kept in check.
Does cruise control make you more comfortable?
We mentioned how cruise control makes it easy to get too comfortable and not stay alert while driving, but it can also lead to slower reaction times in the event of traffic coming to an unexpected stop, another driver cutting you off, or a pedestrian or animal crossing into your path.
Can cruise control be used on slippery roads?
Rain, wind, and slippery roads can make using cruise control even more treacherous. If you’re on a long road trip, it can be tempting to turn on your cruise control and let your guard down, but inclement weather and poor road conditions can jeopardize control of your vehicle and potentially cause an accident. Prioritize your safety and the safety of other drivers and passengers by keeping both hands on the wheel and staying alert, particularly when driving through bad weather.
Why is cruise control bad for steep hills?
The problem cruise control has with steep hills is that the systems are designed to only add power gradually, so as not to cause an oscillation condition where the car surges above the set speed, then slows under, then surges, etc.
How does cruise control work?
Cruise control cannot make the car do anything that youcan't make the car do just by pressing or releasing the accelerator pedal, because that's essentially all cruise control does: push and release the accelerator. With the exception of a small variation plus/minus via the torque convertor, the engine can't change RPM at a given speed without shifting gears.
Why does my car shift up?
Automatic transmissions generally try to balance power output with fuel efficiency, and as a result have generally more mediocre shift points when one is needed at the cost of the other. In this case, the manufacturer probably programmed the car to shift somewhere just above 3k RPM in order to get better gas efficiency out of the car in most use cases (flat roads), as higher gear = lower RPM = less gas consumption, as long as power output is sufficient. It just so happens that when it shifts up, it no longer has the requisite power to accelerate at that RPM, and requires a downshift again. So why doesn't it just lay on the gas in the higher gear? Trying to apply power without enough torque is horrendous for gas mileage, AND your car likely has a set speed of acceleration/RPM increase that it finds acceptable (faster acceleration = more gas usage). In this case, the car finds that it will use an unacceptable amount of gas trying to accelerate in the higher gear, so it applies power in the lower gear (more torque), then shifts up to cruise in the higher gear, which again generally uses less gas due to the lower RPM. In a manual car you might just put the clutch in and cruise instead of shifting to a higher gear, but an automated system would never leave the car out of gear in case an emergency situation occurred.
Do you need a PhD to control a PID?
Typo: you don't need a PhD to control a PID ..
Is nullcharstring a bad control system?
Yep, I gotta agree with nullcharstring. It's just a bad control system on your vehicle. Mine occasionally guesses too low and has to downshift, but then it is able to hold at the correct speed once it gets back there. It's worse on the downhill, as it seems to give it just enough power to keep it from engine braking. I want the engine braking dammit!
Does lazyness invest time into PID tuning?
Lazyness and managers probably not wanting to invest any time into proper PID tuning. "Eh, it holds speed on the highway, close enough".
How much does adaptive cruise control reduce fuel consumption?
According to greencarreports.com, the study showed a 5 to 7 percent drop in fuel consumption for the cars driving with adaptive cruise control compared with human drivers.
Why is aggressive driving bad?
Some people drive very aggressively, they accelerate heavily and suddenly brake, such kind of driving is not fuel-efficient, this aggressive driving cause more fuel consumption.
Why do non flat areas increase fuel consumption?
Non-flat areas increase fuel consumption because the cruise control cannot read the road the way the driver can.
Does cruise control save gas?
So, using cruise control on flat areas such as on motorways can help you save the gas, it saves the gas by driving at a constant speed since the driver does not accelerat e and brake frequently.
Does driving on a flat road save gas?
It depends upon where you drive, if you drive in a flat area such motorway, then it can save gas.
Does driving increase fuel consumption?
This aggressive type of driving can increase the fuel consumption because if you rapidly accelerate, you consume a high amount of fuel, which can travel you a few meters more, but if you brake in middle, you might not reach the point the consumed fuel can, as a result, your fuel is wasted.
It keeps you relaxed
As said above, the cruise control’s primary purpose is to lock the accelerometer at a specific speed and allow you to take your foot off the pedal.
It improves the fuel economy
In a car, almost all elements or in-built systems influence the fuel economy, and so does the cruise control, however, in a positive sense.
It keeps your speed in check
Most drivers usually go at optimal speeds on roads; however, if the same road has more visibility and is more expansive, there are chances of overspeeding.
It goes very well with automatic transmission
If you’re fond of automatic transmission, you should always go for models with cruise control.
It is not suitable for every sort of road
For perfect implementation and use of cruise control, you need wider roads with minimum to no turns.
It increases the reaction time
Here, reaction time means the time taken to move your foot to the brake pedal to deactivate the cruise control and slow down the car.
It increases drowsiness and hampers alertness
Yes, continuous use of cruise control means increased somnolence and less alertness. When you are using cruise control, you have to sit and enjoy driving.
Why can't you use cruise control on a steep road?
If you read the owner’s manual for any car, it will tell you not to use cruise control on a steep road. Cruise control is designed to maintain speed on a fairly level road. When you are driving in mountains, you end up varying your speed in response to the terrain and the road. If you try to drive in mountains with cruise control on, your car will try to maintain a constant speed, with the result that it will rev the engine too high at times, and apply the brakes constantly at other times. This will cause premature aging to your engine, transmission, and brakes.
What is PID in cruise control?
There is a lot going on with cruise controls. They use a control scheme called PID, which stands for Proportional, Integral, Derivative.
What happens if your PID is too sensitive?
If the PID is set too sensitive, the car might actually go faster on hills or speed up, then slow down, back and forth. This is much worse than having it slow a few mph up a hill. I’ve had cars that did this. They are unusable.
How does a car maintain speed?
They don’t. They maintain speed through operating the fuel system. When going down hill they simply ‘back off’ the gas the same as you would by lifting your foot off the pedal. Your car’s engine braking is the only thing maintaining speed, so the more gravity is working against your engine braking (the steeper the hill), the faster you’ll go.
What is hydroplaning on tires?
Hydro- or aquaplaning is a product of speed and the effectiveness of your tires' ability to displace water from the road surface and maintain contact with the asphalt.
How fast can a car go down a hill?
do this little test accelerate at the base of a hill to 45, release the accelerator and the speed will drop to 30 - 45 depending on the hills incline and length, now on the same hill be at the top at 45 mph heading downhill and release the accelerator. By the time you reach the bottom you will be running 50 - 60 MPH. The reason gravity's effect on the mass of your car, going up hill the mass of your car is retarded by gravity causing deceleration, going down hill the mass of your care is boosted by gravity resulting in acceleration.
Why do cars have to de-tune?
So the car manufacture must de-tune the controls some to insure it stays stable. De-tuning means they no longer preform perfectly. It takes more time for the car to come back up to speed, The set speed may never be re-obtained exactly.
What is the danger of cruise control?
The danger with relying on cruise control when going downhill or approaching curves is that you could lose control entirely, manufacturers say.
Why is there a hill warning?
That hill warning is there because the car companies are "worried about runaway vehicles." Elder said.
Can cruise control cause transmission to overheat?
Maybe. "Using cruise control while driving through hilly terrain could cause the system to force multiple transmission shifts which could lead to overheating of the transmission fluid and premature component wear," said Stephen Leroux, automotive professor at Centennial College in Toronto.
Can cruise control see road conditions?
So, cruise control can't see road conditions or upcoming turns – so it won't slow down if roads are slippery or if you're about to hit a sharp curve. "The car companies are putting these recommendations there for safety," Elder said. "They want the driver to be completely in control.". And hills?
Can cruise control see hills?
And hills? The cruise control can't see them either. Ford's manual states: "When you are going downhill, your vehicle speed may increase above the set speed. The system will not apply the brakes. Change down a gear to assist the system in maintaining the set speed."
Does Chrysler have cruise control?
While Chrysler called its first version of cruise control auto-pilot, the technology, even now, does one thing – it keeps you at the speed you set, no matter what's happening on the road.
Do cars shift gears?
Some cars do shift gears to slow you down when you're going downhill, said Stu Miller, senior manager of auto service centre operations with the British Columbia Automobile Association (BCAA). "Some cars today have the ability to do transmission braking and engine braking, but not all cars do," Miller said.
