Fuel Consumption Speed

ENGINEERING – TRANPORTATION ENGINEERING CALCULATOR Fuel Consumption Speed A precise tool.
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What is the Fuel Consumption Speed & How does it work?

Fuel consumption does not stay constant as a vehicle changes speed; aerodynamic drag, engine efficiency, and drivetrain losses all vary with velocity, creating a characteristic curve.

To compare different vehicles, engineers often define a reference speed (v_{0}) at which the consumption (C_{0}) is measured (e.g., 60 km/h). This baseline anchors the curve and allows the effect of speed to be expressed as deviations from (v_{0}).

A common empirical model adds linear and quadratic terms to capture the increasing drag and engine load: (C(v) = C_{0}bigl(1 + a,(v – v_{0}) + b,(v – v_{0})^{2}bigr)). The coefficients (a) and (b) are fitted from test data and reflect how sharply consumption rises with speed.

C(v) = C_{0} left(1 + a,(v – v_{0}) + b,(v – v_{0})^{2}right)
C(v) = fuel consumption at speed (v) (L/100km)
C_{0} = baseline consumption at reference speed (v_{0})
a = linear speed coefficient (1/(km/h))
b = quadratic speed coefficient (1/(km/h)²)
v = target speed (km/h)
v_{0} = reference speed (km/h)
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Parameters
Result —
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Frequently Asked Questions
What is the reference speed in this calculator?
The reference speed (v_{0}) is a baseline speed at which the fuel consumption (C_{0}) is measured, typically around 60 km/h.
How does the empirical model add terms to the fuel consumption curve?
The model adds linear and quadratic terms to account for changes in aerodynamic drag, engine efficiency, and drivetrain losses as speed varies.
Can I use this calculator to compare different vehicles?
Yes, by defining the reference speed and consumption for each vehicle, you can compare their fuel efficiency at various speeds.
What does a higher quadratic term indicate in the model?
A higher quadratic term indicates that the increase in fuel consumption becomes more significant as the speed increases beyond the reference speed.
How do I interpret deviations from the reference speed in the curve?
Deviations from (v_{0}) show how much the actual fuel consumption differs from the baseline at other speeds, helping to understand efficiency changes.
Is this calculator suitable for all types of vehicles?
This model is generally applicable to road vehicles but may need adjustments for specific vehicle types or conditions.
Can I input my own data into the calculator?
Yes, you can input your own reference speed and consumption values to analyze your specific vehicle’s fuel efficiency.

Results are for informational purposes only and do not constitute professional advice.