Quote:
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Originally Posted by sperry
Quote:
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Originally Posted by dayofpain
its like this
yaw = pitch in relation to the horizon.
g's = measurement in "gravitys" of inertia in any direction.
2 different sensors measuring different things.
a car moving faster pitches into corners at different g's and differnt yaw rate as compared to a car moving at a slower rate of speed. also changes in suspension change things differently as well. now have two "almost" redundant sensors makes things awesome as one backs up the other and so forth. the two sensors cooerlate and decide which torque split to give the wheels. these only work in "auto" mode. in any other mode both sensors are defeated. two sensors being better because well lets face it, we all know more is better right? we are americans. ;P
maybe clears things up.
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Your description of yaw and G's are wrong, but you're right about there being a difference between latteral G force and yaw rate.
If you imagine a 3-axis system where X points down the nose of the car, Y point out the passenger door, and Z point up through the roof... yaw is defined as rotation about the Z axis. Pitch would be rotation about the Y axis and roll would be rotation about the X axis.
Latteral G Force is force, not inertia. Well, technically it's a "pseduoforce" that's generated by the car traveling around a circle during cornering. The force's direction is towards the center of the circle the car is traveling around, and it's magnitude is what we call "latteral G's", and it's measured in multiples of the force of gravity on Earth (aka 9.8m/ss).
The DCCD uses lateral G to decide how to bias the torque between the front and rear wheels in Auto mode. The VCD (aka traction control) uses yaw rate to determine what wheels to brake to keep the car from spinning out or pushing.
So yes, two sensors are potentially better, but in this case they're actually being used for different purposes... one's for torque split, the other's for traction control. |
ok so aparently we are going to get really technical, i forogt how retarded online forums can be.
your description is just as fallable as mine.
there are two sensors in the car
1. measures the inertial force IE: g-force (
www.websters.com) of the car
2. measures the "direction the car is tipped" or the "degree" in relation to its horizontal axis.
the sensors correlate between each other and make the decision of which tires get torque and which do not.
lastly, i thought this thread was about how noone knew what they did, you posted the correct answer right off the bat.
i was just trying to help.
ALSO as point of reference. car makers tend to call shit anything they please whether its correct or not. IE: yaw sensor not measuring degrees in relation to vertical axiss but measuring degress against horizontal axiss. cause they think they are cool and innovative. they make up terms and use terms INCORRECTLY all the time. i took one such sensor apart and found it couldnt possibly measure the degree relation in which it was named for. due to its inner workings it could only measure based off of the horizon. UNLESS my sensor was mounted incorrectly (impossible due to bracket shape).