2012 Camry Cruise Control Accelerating Down Hill - Toyota Nation Forum : Toyota Car and Truck Forums


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7th Generation (2012+) Toyota Camry Discussion for years: 2012+

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Old 05-29-2012, 11:10 AM   #1 (permalink)
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2012 Camry Cruise Control Accelerating Down Hill

I have a 2012 Camry LE with the 4 cylinder & automatic trim. I noticed that when I have cruise control on and going down hill the car will accelerate until I eventually have to hit the brakes to prevent going 10+mph over my cruise speed. Is this normal? This is the first car I have driven where cruise control will not maintian desired speed when going down hill. Do I need to go to dealership?
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Old 05-29-2012, 11:36 AM   #2 (permalink)
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I'm assuming you mean "gain speed" when you say the car accelerates and not that the system applies throttle to gain speed. IF it applies throttle to gain speed, then you better talk to the dealer about it. If you mean it just gains speed, then it depends on the grade of the downhill road you're talking about. Cruise control does not apply brakes for you, so if the grade is steep enough that the vehicle's weight gives it enough momentum to override the vehicle's engine braking resistance, then your speed will go up. Try different grades of downhills. I doubt it's something wrong with the car's system.

If it maintains set speed in a normal highway, then don't worry about it...you're not supposed to "cruise" on downhill roads anyway
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Old 05-29-2012, 11:38 AM   #3 (permalink)
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I don't drive any steep hills, so I have not experienced 10+ over set speed. Would you say the grade was steep where you experience this.

Copied from OM page 202:
"Situations unsuitable for cruise control
Do not use cruise control in any of the following situations.

....
●On steep hills Vehicle speed may exceed the set speed when driving down a steep hill."
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Old 05-29-2012, 03:09 PM   #4 (permalink)
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gen 7

I had the same thought at first.. "This car is accelarating down hill!" But I soon figured it out. The damn car has such low resistance that it was just gaining speed by just rolling down hill ! I have learned to just down shift the automatic a few speeds to allow the transmission to dynamically brake to reduce and maintain my desired speed. I have a hard time keeping my speed with in the speed limit. I have such a lead foot.
I find myself thinking it feels like I'm just doing 6o mph and then I look down and see I am really doing 80 mph... Man I love this car !

P.S. I know if I would have bought the V6 that I would have a dozen speeding tickets by now...

3,700 miles and counting...
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Old 05-29-2012, 04:00 PM   #5 (permalink)
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Yes the car is gaining speed rather than applying more throttle. I see this on I-5 in southern Oregon on 6-7% grades. I'll have the cruise set to 70mph and it will go up to 75-80mph before I hit the brakes. I wish the tranny would downshift so I wouldn't have to reset the cruise after hitting the brakes. Anyone else experience this? My Toyota Tacoma maintains speed downhill with the cruise on no problem. I agree the rolling resistance is so low that the car overcomes the engine braking in 6th gear so you overshoot your cruise speed on steep hills.
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Old 05-30-2012, 12:24 AM   #6 (permalink)
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My personal car 2012 SE I4 is doing thesame thing. The cruise control won't hold to the set speed when going downhill.

I had three Honda Accords before and their cruise control holds to it's setting in downhill. The cruise control of my 2012 Camry LE Hybrid service car is also holding on its setting during downhill driving.

I don't think this is normal for the new Camry. I will have the dealer check the cruise control for possible defect.
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Old 05-30-2012, 07:59 AM   #7 (permalink)
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That low resistance freewheel, is built into the trans to help fuel economy. Normal.

If the tach does not go up, when on cruise -- coasting down hill, it is not accelerating.


Do the same hill with out cruise-!
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Old 05-30-2012, 10:28 AM   #8 (permalink)
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gain speed = acceleration

Like free fall in vacuum acceleration is 9.8 meter per second.

Question is why it gain speed. These guys think it's the cruise increasing speed because they don't understand how cruise control work.

Old cruise control only control gas paddle. It keep the speed above the set speed. It apply gas paddle only when it detect the speed is below the set speed. When the set speed is achieve it will ease off on the gas paddle, and when it go above it will ease off even more to the point of letting go of the gas paddle. Cruise control don't have control of the brake, that is the driver's job.

When I first learn about cruise control, I thought it also steer the car. I learn real quick that it doesn't. LOL
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Old 05-30-2012, 11:41 AM   #9 (permalink)
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Quote:
Originally Posted by workerant View Post
gain speed = acceleration

Like free fall in vacuum acceleration is 9.8 meter per second.

Question is why it gain speed. These guys think it's the cruise increasing speed because they don't understand how cruise control work.

Old cruise control only control gas paddle. It keep the speed above the set speed. It apply gas paddle only when it detect the speed is below the set speed. When the set speed is achieve it will ease off on the gas paddle, and when it go above it will ease off even more to the point of letting go of the gas paddle. Cruise control don't have control of the brake, that is the driver's job.

When I first learn about cruise control, I thought it also steer the car. I learn real quick that it doesn't. LOL
Acceleration on Earth in a vacuum is actually 9.8 m/s^2 :P. But yes, you are correct. An increase in velocity results in an increase in acceleration (acceleration = change in velocity/change in time). However, I'm pretty sure what the other member(s) meant was that the car is not actively accelerating when going downhill, i.e. the car isn't depressing the gas pedal.

At least you weren't the guy who flipped his RV because he decided to take a nap or make coffee or something while it was on cruise control, haha.
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