Last post on Nov 13, 2011 at 11:20 AM
You are in the Toyota Highlander Hybrid
What is this discussion about?
Toyota Highlander Hybrid, Hybrid Cars, SUV
#3810 of 4026 Adaptive cruise control
Nov 02, 2007 (5:24 am)
Probably the major reason I did not purchase a Lexus 400h hybrid a couple of years ago was the fact that it did not have adaptive cruise control, even though the "regular" Lexus 350 did. Which I thought was somewhat strange because I would think the ability to automatically (and smoothly) slowdown and speed up in stop-and-go and rush-and-slow traffic would increase fuel economy.
Can I get adaptive cruise control with the new 2008 Toyota Highlander Hybrid?
#3811 of 4026 Re: Adaptive cruise control [newcars]
Nov 02, 2007 (8:22 am)
"Which I thought was somewhat strange because I would think the ability to automatically (and smoothly) slowdown and speed up in stop-and-go and rush-and-slow traffic would increase fuel economy."
I would think the opposite. The system reacts to traffic, which is not smooth by any means. Thus it might well reduce MPG when compared to careful (but courteous) driving.
#3812 of 4026 Re: Don't Forget VDIIM when Comparing [cdptrap]
Nov 02, 2007 (8:23 am)
"The HH, set to CRUISE at 55 MPH, upon sensing my steering to the LEFT (south) as it enters the curve, reduces speed smoothly to 50-51 MPH, makes the climb, lets me turn back RIGHT (west) and smoothly accelerates to preset CRUISE speed."
The vehicle is not responding to the wheel turning, it is responding to the lean of the vehicle as you go into the turn.
If it were simply the wheel turn, then the cruise control would slow you down when you moved to the left lane to pass a truck - hardly the desired operation when passing!
#3813 of 4026 Re: Don't Forget VDIIM when Comparing [kdhspyder]
Nov 02, 2007 (8:32 am)
Yes, I am aware of the fact that in the HH the electric stearing will be "biased" against the driver turning in the "wrong" direction once the VSC aspect of VDIM detects that the vehicle is going "off course".
First, this is clearly a REACTIVE effort.
And VDIM is used across the product line whereas only the vehicles with electric stearing could have this implementation.
#3814 of 4026 Re: Don't Forget VDIIM when Comparing [stevedebi]
Nov 02, 2007 (8:45 am)
I suspect the operative term here might be...
"..reduces speed smoothly to 50-51 MPH, makes the climb,..."
The CC's reaction to a "climb" is always delayed with respect to our own "view" of the road ahead, it must wait for the vehicle's speed to decline before reacting.
In order for VDIM to react to the vehicle "leaning" it must have sensors to indicate same, it does not. It does have "yaw" sensors which might be used for this but typically is not.
#3815 of 4026 Re: Don't Forget VDIIM when Comparing [wwest]
Nov 02, 2007 (11:49 am)
"In order for VDIM to react to the vehicle "leaning" it must have sensors to indicate same, it does not. It does have "yaw" sensors which might be used for this but typically is not."
I'm not sure what to call them, but the vehicle senses when lateral force is being applied in a turn, if I understand stability control correctly, and takes action to ensure that the vehicle does not go out of control. From what people are saying here, that includes reducing the speed until the vehicle determines that the turn is complete.
#3816 of 4026 Re: Don't Forget VDIIM when Comparing [stevedebi]
Nov 03, 2007 (9:47 am)
"..that includes reducing the speed until the turn is complete."
Probably only if the lateral forces are considered extreme even for a high traction roadbed surface, an exceedingly tight turn, or an accelerating TIGHT turn, for instance.
VSC relies on two sensors, mostly, a stearing wheel directional position sensor, and a yaw sensor. Along with roadspeed these are used to determine if the vehicle is following the course, "line" set by the stearing wheel sensor.
If the rear end "drifts" "out" in a tight turn, over-stearing, the VSC will react by braking the front wheel on the outside of the turn to create a moment counter to the "drift". Should the brakes be already applied it will "unbrake" the inside front wheel.
For plowing, under-stearing, my '01 AWD RX300 brakes both rear wheels as an aid in slowing theh RX in hope of regaining (enough) front wheel traction.
I have seen no mention of dethrottling for VSC circumstances. But I would think it would be unsafe to do so for a "plowing" FWD or an overstearing RWD unless the throttle opening is considering severe enough to be, itself, the causative factor.
#3817 of 4026 Re: Don't Forget VDIIM when Comparing [wwest]
Nov 03, 2007 (10:33 am)
The VSC/TRAC system is a dual-layered system using the ABS as you correctly noted and using the DBW throttle system to reduce engine output....not making a bad condition worse.
#3818 of 4026 Re: Don't Forget VDIIM when Comparing [kdhspyder]
Nov 03, 2007 (5:17 pm)
My '01 AWD RX300 does not have DBW yet the TC system is clearly able to dethrottle the engine.
EFI fuel cut..??
#3819 of 4026 I Got My 2008 HiHy
Nov 06, 2007 (11:27 am)
Well, I took the plunge and got one of the new Highlander Hybrid Limited's last night. So far, everything's living up to expectations and I'm very impressed with the vehicle. It will take some time to get used to its way of "thinking," but I'm really looking forward to that.
I do have one minor question, though. I searched in the Owner's Manual but couldn't find an explanation for the Tire Pressure Monitoring System display layout. It shows a single column of tire pressures, but which reading is which tire or wheel location?
Here's to many miles and fewer gallons!