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Engineering
Electrical Engineering
Unreasonable values for engine torque in vehicle simulation
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[QUOTE="jrmichler, post: 6424565, member: 638574"] Unlikely. The difference between actual and calculated torque is only 10%, and some of your numbers are estimated rather than measured. Some things to check: 1) Check RPM vs road speed to make sure you have the correct tire diameter, transmission gear ratio, and differential gear ratio. Calibrate your speedometer first. 2) Measure your actual aerodynamic drag and rolling friction by a coastdown test. Here's how I tested my truck: [URL]https://ecomodder.com/forum/showthread.php/coastdown-test-06-gmc-canyon-20405.html[/URL]. Note that different tires have different rolling resistance, tire pressure affects rolling resistance, and ambient temperature affects both drag and rolling resistance. 3) Measure the actual acceleration using the same procedure as for the coastdown test. Measuring speed vs time is typically more accurate than an accelerometer. [/QUOTE]
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Electrical Engineering
Unreasonable values for engine torque in vehicle simulation
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