Alright I have a 5-speed XR and the cruise control often gets a little excited...whenver I'm on a highway with the cruise control on and go up a big hill, the cruise control overaccelates when the car gets over the crest of the hill. For example, if I have the CC set at 60 mph and I'm in 5th gear and go up a hill that the car takes at 57 mph or so, it'll accelerate past 60 and up to 65 mph or so as it goes over the crest of the hill. If I hit "cancel" while it's doing this, it doesn't stop accelerating, it just keeps going till it gets 5 mph or so above where I set it. This is concerning, since cops like to hang out over the crests of hills because you can't see them as easily, and I'm gonna be pissed as hell if I get a ticket for an overzealous cruise control. Does anyone else have this problem? Anyone got a solution?
The only time my cruise over-accelerates is when I accelerate using the cruise control switch (instead of using the gas to accelerate) while already in cruise control. When I release the switch there seems to be a delay and that's when I experience over-acceleration. You'd think it'd stop as soon as you release it.
You should definitely have yours looked at especially if doesn't cancel when you want it to cancel. When I hit cancel, it disengages IMMEDIATELY.
Interesting...I have to take my car in for its first oil change, so I'll mention that to them and ask if that's how it should be.
Yeah, it comes back down to its normal speed, it just does so after going several mph past where I set it. There is a significant (about 3 second) delay between when I hit cancel and when it stops accelerating if I hit cancel in the middle of one of its acceleration fits.
I'm wondering if this behavior relates to it being a manual transmission. This is the first manual car I've driven that has cruise control, and it seems to do this whenever I probably should've downshifted but didn't want to cause it'd defeat the purpose of me having CC altogether.
The guy I talked to at the dealership didn't seem like he knew crap about cars and was mostly a clerical guy...and he didn't really have any idea about the cruise control. So, I'm gonna try to figure out why the heck it does that and possibly tune the CC to behave itself a little better. If anyone has any suggestions, lemme know, especially if you also have an '05 trix 5-speed and don't experience this problem, cause I need to get it fixed while it's still under warranty if it's an actual issue.
I have noticed that on my 2005 XR Auto that Toyota has set the cruise acceleration a little higher than what I would like. When you click the cruise arm to resume to 55 mph its rather generous on the gas and revs up to 3000 rpm -- makes the engine sounds likes its being beat on by a joy rider. In my previous car, a 1980s Buick V6, it was hard to hear the engine at all unless you kicked in the passing gear. I wished Toyota would have done better on insulating the engine sound from the passenger compartment, buts it comparible with the similar sized Ford Focus Wagon.
The guy I talked to at the dealership didn't seem like he knew crap about cars and was mostly a clerical guy...and he didn't really have any idea about the cruise control. So, I'm gonna try to figure out why the heck it does that and possibly tune the CC to behave itself a little better. If anyone has any suggestions, lemme know, especially if you also have an '05 trix 5-speed and don't experience this problem, cause I need to get it fixed while it's still under warranty if it's an actual issue.
Why didn't you ask to speak to someone w/ a better sense of your problem? Did you talk to a salesman? lol. Ask for the service manager. I wouldn't play around w/ it too much in case something goes wrong and you could kiss the warranty for the cruise goodbye. Get them to investigate and fix it. That's what the warranty is for.
yeah i have an XRS and i have this issue. but its not a big deal. it only goes 2-3 mph over and corrects itself. it kinda jerks the car though hot coffee drinkers beware.
I have noticed that on my 2005 XR Auto that Toyota has set the cruise acceleration a little higher than what I would like. When you click the cruise arm to resume to 55 mph its rather generous on the gas and revs up to 3000 rpm -- makes the engine sounds likes its being beat on by a joy rider. In my previous car, a 1980s Buick V6, it was hard to hear the engine at all unless you kicked in the passing gear. I wished Toyota would have done better on insulating the engine sound from the passenger compartment, buts it comparible with the similar sized Ford Focus Wagon.
Ditto with our '05 'rolla S. "Rather generous on the gas" is kind of an understatement.......we drove up to Phila PA from Knoxville TN, andthe cc kicking down from o/d to 2nd to get up hills was a lil disconcerting, for awhile (guess I was used to it by the time we drove back south). We also have a '95 Olds 88 which we never ever noticed anything similar......guess that's the difference between having a big torque-y V6 vrs a small efficient I4....hwy gas mileage was pretty good, concerning the loaded car, the a/c, the crazy cc and the hills (and driving at a spirited pace) - I think we averaged about 37 mpg for the whole trip, so I guess no harm done to gas mileage by the fluctuating cc, anyways...
Yeah i have a 2005 matrix TRD 5 speed and it has the same problem going over a crest accellerates about 5km/h over set speed and then slows back down. I am going to have the dealership take a look at this when i'm due for my first oil change. I do not have any problem with the cancel on the cruise.
The cruise control control algorithms vary a lot between different makes/models. Most simple implementations overshoot, and here is why: The CC needs feedback to maintain a set speed in the face of hills, wind, etc. The feedback is usually just a value expressing on average how much above or below the set speed you have been over the past several seconds. The problem is that when you crest a hill, if the CC fell behind up the hill, it is still remembering that on average it was going too slow recently, so even after it has gotten up to your set speed it still thinks it has to go faster, so you overshoot. It is a deficiency in the CC algorithm, and it is there because it is cheap and easy to implement. A better CC algorithm will still have these terms to see what the average recent error is, but will also have terms for the CHANGE in error between the last two samples. If the error is decreasing quickly (that is, you are approaching your set speed too quickly) it will back off and prevent the overshoot. If the error INCREASES quickly (when you first hit the hill), this allows it to give lots of gas before it has a chance to fall behind. So such a system can be better all around. I have a friend who had a BMW, and it was rock solid on the set speed in all terrain. My 04 XR manual, on the other hand, overshoots by 2-3 MPH sometimes when I crest a short steep hill.
Workaround 1: When I crest a hill in my 04 XR manual, and it had fallen behind, I watch for when it gets back up to the set speed, and then I quickly hit "cancel" then "resume". This clears its "history" of being behind, thus preventing the overshoot.
Workaround 2: When I see a short steep hill, I leave the CC on but manually push the gas pedal down more quickly and further than the CC would, thus it DOESN'T fall behind, thus it doesn't overshoot at the top.
Well took my car in for it's first oil change and got them to look at the cruise and they said that it was working normally. The claim that it is also the same on other toyota vehicles like the sienna and corrolla, kinda fustrating to have it over accell at the crest of the hills, but looks like we are just going to have to live with it. You would think they would be able to use a more accurate cruise control system since i have been in many other cars that do not have this problem. Also a friend of mine has a celica gt which has same engine and his cruise does not have the same problem.
TRD
oh one other thing that may have an affect on the cruise control is that all 2005 corolla and matrix has an electronic throttle, no more cable linkage.
My 2003 Vibe does the same thing, you get used to it... it seems like Toyota's cruise control system does not use a "level device" that notices the change in inclination....
The Trix and Vibe don't have thes best cruise control systems out there that;s all....
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