Optimize Your EV in Visual Studio .NET

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Optimize Your EV
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Optimizing is always step number one Even if you go out to buy your electric vehicle ready-made, you still want to know what kind of a job has been done so you can decide if you re getting the best model for you In all other cases, you ll be doing the optimizing either by the choices you make up front in chassis selection or by your conscious optimizing decisions later on In this section, you ll be looking to minimize the following resistance factors: Weight and climbing and acceleration Aerodynamic drag and wind Rolling and cornering resistance Drivetrain system You ll look at equations that define each of these factors, and construct a table of real values normalized for a 1,000-lb vehicle and nine specific vehicle speeds These values should be handy regardless of what you do later just multiply by your own EV s weight ratio and use directly, or interpolate between the speed values You ll immediately see a number of values reassembled in the design section of this chapter, when a real vehicle s torque requirements are calculated to see if the torque available from the electric motor and drivetrain selected is up to the task This design process can be infinitely adapted and applied to whatever EV you have
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Conventions and Formulas
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This book uses the US automotive convention of miles, miles per hour, feet per second, pounds, pound-feet, etc, rather than the kilometers, newton-meters, etc, in common use overseas Any formulas borrowed from the Bosch handbook have been converted to US units Speaking of formulas, you will find the following 13 useful; they have been grouped in one section for your convenience:
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Figure 5-1
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For a great EV chasis: optimize, design, and then buy it
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Build Your Own Elec tric Vehicle
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1 Power (ft-lb/sec) 5 Torque (ft-lb) 3 Speed (radians/sec) 5 Force in feet per second (FV) 2 1 Horsepower (hp) 5 550 ft-lb/sec Applying this to equation 1 gives you: 3 Horsepower (hp) 5FV/550 where V is speed expressed in feet/sec 4 88 feet/sec 5 60 mph Multiply feet/sec by (60 3 60)/5280 to get mph 5 Horsepower (hp) 5 FV/375 where V is speed expressed in mph and F is in pounds 6 Horsepower (hp) 5 (Torque 3 RPM)/5252 5 2 p/60 3 FV/550 7 Wheel RPM 5 (mph 3 Revolutions/mile)/60 8 Power (kW) 5 07457 3 hp 9 The standard gravitational constant (g) 5 3216 ft/sec2 or almost 22 mph/sec 10 Weight (W) 5 Mass (M) 3 g/3216 For the rest of this book, we will refer to a vehicle s mass as its weight 11 Torque 5 (F(5280/2p))/(Revolutions/mile) 5 84034 3 F / (revolutions/mile) Revolutions/mile refers to how many times a tire rotates per mile 12 Torquewheel 5 Torquemotor 3 (overall gear ratio 3 overall drivetrain efficiency) 13 Speedvehicle (in mph) 5 (RPMmotor 3 60) / (overall gear ratio 3 revolutions/mile)
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It Ain t Heavy, It s My EV
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In real estate they say the three most important things are location, location, and location In electric vehicle conversion the three most important things are weight, weight, and weight In this section, you ll be taking a closer look at the items in the Weight row of Figure 5-1 and the supreme importance of minimizing weight in your EV
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Remove All Unessential Weight
You don t want to carry around a lot of unnecessary weight But, unless you re starting with a build-from-scratch design, you re inheriting the end result of someone else s weight trade-offs This means you need to carefully go over everything with regard to its weight versus its value at three different times
Before You Purchase the Conversion Vehicle
Think about the vehicle s weight-reduction potential before you buy it Is it going to be easy (pickup) or difficult (van) to get the extra weight out What about hidden-agenda items Has a previous accident resulted in a filled fender on your prospective purchase (Take along a magnet during your exam) Does its construction lead to ease of weight removal or substitution of lighter-weight parts later Think about these factors as you look
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