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Homework Help: Help me in design calculation for hybrid car

  1. Aug 8, 2012 #1
    Hye everyone....
    My project is regarding with hybrid car.can someone show me the calculation and the formula used to proved this value.taking example honda insight:

    for engine:

    Engine Type: In-Line 4-Cylinder
    Displacement (cc): 1339
    Horsepower @ rpm (Combined: engine (SAE net) + electric motor): 98 @ 5800
    Torque (lb-ft @ rpm, combined engine (SAE net) + electric motor): 123 @ 1000-1700
    Bore and Stroke (mm): 73 x 80
    Compression Ratio: 10.8 : 1
    Valve Train: 8-Valve SOHC i-VTEC®

    how do they get the horsepower and torque?what is the formula used?

    for electric motor (BLDC motor):

    Power (hp @ rpm): 13 @ 1500
    Torque (lb-ft @ rpm): 58 @ 1000

    how do they get the horsepower and torque?what is the formula used?

    additional info:

    battery specs:

    Output (Volts): 100.8
    Rated Capacity: 5.75 Ah

    I really stuck here...Please help me.Thank you all :)
  2. jcsd
  3. Aug 9, 2012 #2


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    Science Advisor
    Homework Helper
    Gold Member

    if you use the right units...

    Power = torque * angular velocity

    (Angular velocity is related to rpm remember)

    It's probably possible to calculate the likely power output of a gas engine from first principles (if you are an expert in gas engine design), but it can also be measured on a rolling road. As can the torque.

    You don't have enough information to calculate the power yourself. At best you could check that the power and torque are roughly consistent with each other because the give you the rpm.
    Last edited: Aug 9, 2012
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