Type-S Torque Sensitive power steering
#1
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Type-S Torque Sensitive power steering
The March 2001 Car&Driver article (pg 83) states:
"The crowning touch, we think, is the replacement of the TL's speed-sensitive power-steering assist with a torque-sensitive system that offers much better road feel to the enthusiast driver."
What is "Torque-sensitive" power steering? How will it work? I assume at low engine torque times, the power assist will be high, and then at high torque times it will be less assisted. (Parallel parking, low engine torque, high power steering assist.) Is that right?
But what about when you are coasting down a hill, foot not even on the gas pedal, high vehicle speed, but low engine torque. In that situation, would power assist be high? (Eeeek!! A slight turn of the wheel, and you drift off the road.) Conversely, when I am turning onto the street, low vehicle speed, but high engine torque, then the power steering assist would be low, hard to turn the wheel. That doesn't sound good either.
Anyone know how this system really works, because I am an engineer, and this has me stumped.
"The crowning touch, we think, is the replacement of the TL's speed-sensitive power-steering assist with a torque-sensitive system that offers much better road feel to the enthusiast driver."
What is "Torque-sensitive" power steering? How will it work? I assume at low engine torque times, the power assist will be high, and then at high torque times it will be less assisted. (Parallel parking, low engine torque, high power steering assist.) Is that right?
But what about when you are coasting down a hill, foot not even on the gas pedal, high vehicle speed, but low engine torque. In that situation, would power assist be high? (Eeeek!! A slight turn of the wheel, and you drift off the road.) Conversely, when I am turning onto the street, low vehicle speed, but high engine torque, then the power steering assist would be low, hard to turn the wheel. That doesn't sound good either.
Anyone know how this system really works, because I am an engineer, and this has me stumped.
#7
Dragging knees in
iTrader: (2)
From what I remember...
On speed-sensitive, the power steering assist boost is relative to the vehicle speed.
On torque-sensitive, the power steering assist boost is relative to the engine speed (RPM).
It's all possible by a variable-ratio power steering pump that can vary the force of hydraulic pressure to increase or decrease steering assist.
But I'm not 100% sure, so don't quote me.
On speed-sensitive, the power steering assist boost is relative to the vehicle speed.
On torque-sensitive, the power steering assist boost is relative to the engine speed (RPM).
It's all possible by a variable-ratio power steering pump that can vary the force of hydraulic pressure to increase or decrease steering assist.
But I'm not 100% sure, so don't quote me.
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#8
Originally Posted by Pure Adrenaline
From what I remember...
On speed-sensitive, the power steering assist boost is relative to the vehicle speed.
On torque-sensitive, the power steering assist boost is relative to the engine speed (RPM).
It's all possible by a variable-ratio power steering pump that can vary the force of hydraulic pressure to increase or decrease steering assist.
But I'm not 100% sure, so don't quote me.
On speed-sensitive, the power steering assist boost is relative to the vehicle speed.
On torque-sensitive, the power steering assist boost is relative to the engine speed (RPM).
It's all possible by a variable-ratio power steering pump that can vary the force of hydraulic pressure to increase or decrease steering assist.
But I'm not 100% sure, so don't quote me.
#9
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Here is the explanation of speed-sensitive:
http://www.canadiandriver.com/articles/jk/at_010327.htm
Here is the explanation of torque-sensitive from Honda:
Source: http://www.hondanews.com/CatID2006?m...36652&mime=asc
Now maybe this 5 year old thread can
http://www.canadiandriver.com/articles/jk/at_010327.htm
Here is the explanation of torque-sensitive from Honda:
Rack and Pinion Steering With Improved Stability and Reduced Kickback
The Accord's well-weighted and highly responsive power rack-and-pinion steering system provides an exceptionally linear and consistent feel regardless of pavement conditions. The Accord's power assist is steering-torque sensitive; hydraulic boost is applied to the system in direct proportion to the amount of force (torque) created between the tire and the road as the wheel is steered.
As the force increases, the system increases the amount of power assist accordingly. Regardless of speed, an increase in effort is countered by an increase in boost (for example, if the wheels encounter a rough surface with a greater coefficient of friction).
The Accord's well-weighted and highly responsive power rack-and-pinion steering system provides an exceptionally linear and consistent feel regardless of pavement conditions. The Accord's power assist is steering-torque sensitive; hydraulic boost is applied to the system in direct proportion to the amount of force (torque) created between the tire and the road as the wheel is steered.
As the force increases, the system increases the amount of power assist accordingly. Regardless of speed, an increase in effort is countered by an increase in boost (for example, if the wheels encounter a rough surface with a greater coefficient of friction).
Now maybe this 5 year old thread can
#11
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all i know is that in my 96 TL when i hit the gas (even at speed) i get torque steer pretty bad. especially noticable on the interstate when i drop a gear and stomp it. course it also breaks traction to the front tires half the time when i do this...
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