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Engineering
Electrical Engineering
Unreasonable values for engine torque in vehicle simulation
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[QUOTE="rrowe, post: 6424334, member: 684495"] Mass was determined from the curb weight of the Camry plus about 100 kg for the driver and fuel. The wheel radius is from the specification for the stock tires, as well as the gear and differential ratios. Drag force was determined using equation (1) from [URL='https://www.engineeringtoolbox.com/drag-coefficient-d_627.html']this page[/URL] and an experimentally determined drag coefficient via wind tunnel test. Friction force was determined using equation (3) from [URL='https://www.engineeringtoolbox.com/rolling-friction-resistance-d_1303.html']this page[/URL]. Note that the page linked in the original post mention in an example: Those values are relatively close to my computed values, give or take some for the speed difference, difference in drag coefficient, etc. 1.5 m/s[SUP]2[/SUP] is a chosen number. It was chosen based on research of typical longitudinal acceleration during driving. I also corroborated this by observing similar values with accelerometer readings during a test drive. Anecdotally, this is equivalent to ~3 mph/sec which is a rate I would absolutely expect to see during normal driving conditions. Is it possible my understanding of automotive powertrains is flawed and there's additional factors altering torque other than the two gear ratios I currently account for? [/QUOTE]
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Electrical Engineering
Unreasonable values for engine torque in vehicle simulation
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