2019年5月4日土曜日

Necessity of Thrust Trim for a vehicle

Wheel alignment and axle constructive adjustment on VW Golf 7 GTI are over after exchanging front wheels as a matter of fact. She goes straight without steering adjustment at all, score is 99 point if I apply.
25,000 km used wider tires require desperate effort to obtain straight running, without any adjustment consciously and unconsciously.
The Thrust Angle value within the tolerance, plus minus 10 minutes angle value and actual Zero Thrust differ each other at all.
Also the thrust angle changes according to burdening condition, with a driver only or with an assistant and heavier baggage.
So, the adjustment to establish Zero Thrust condition should be done under some specific condition logically.
In addition, residual fuel in the tank affects on the datum.
Anyway, Zero Thrust is difficult to establish because of the procedures under the condition of physical property of flexible rubber materials, tires and bushes.
Because have I experiences on this alignment adjustment to have done that for 20 years, I try it, who on Earth will do that except manufacturer's engineers specialized in the research and developing divisions?
An airplane pilot does  "Trim Adjusting" on every three dimensional wings as a routine work, because if the procedures were not done, the airplane cannot keep straight flight.
As for vehicles, thrust adjustment is done by a driver unconsciously to keep straight running.
Of course, caster, toe, SAI, scrub contribute to keep straight running, but fundamental discrepancy cannot be removed. It is just like a bud neutral Rudder is compensated by Aileron trim.
The discrepancy on the Thrust must be corrected by thrust adjustment, Scientific and Physiologic phenomena cannot be denied and be deceived.

As my proposal to the vehicle manufacturers, how about applying "Thrust Trim" in a sophisticated hi-end model and the adjusting action might be left on the fashionable "IA technology"?
The value of the car increases dramatically, no?

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