Power Supply: PWM or CAN?

Each power supply comes with 3 inputs: PWM (2 pins), CAN (4 pins) and Analog / Potentiometer (3 pins). In general only one can be used at a time for the speed control (PWM or CAN), with the exception of a safety potentiometer or brake pedal that can work in parallel as a safety control …

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Hollow Roller Design (braked dynos)

Despite theis higher complexity and cost, typically braked dynos use Hollow Rollers because the capacity of having longer axles, which are necessary for connecting the rollers between them (car dynos) and with the brake. Car dynamometers can also use hollow rollers for inertial dynos because it is necessary to connect them in pairs. Advantages of …

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PID Setup

P.I.D. coefficients determine the brake response to the difference between the desired speed (target) and the current speed (this difference is called error).The DAQ (SP1+ / SP5 / SP6) implements a standard PID, with I constant proportionally to P (Kp)  Ti, this allows changing only Kp constant and SP5 will modify Ki to keep …

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How to do a Dyno Run

In most cases we need to know an estimation of the Power at Engine, which implies to record the coast down phase: friction losses from tyre losses and air-pump losses from brake mainly. This coast down phase must be recorded with the clutch pressed or the Neutral position selected

Inertial Roller Design

Typically we use solid rollers for inertial dynamometers, specially for Motorcycle dynamometers due to its extreme simplicity. They can be used for car dynamometers although the amount of steel to be removed to create longer axles (in order to connect each side roller) may be a bit high, which makes more time and money costly …

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Load Cell Calibration

Calibration of loadcell, for dyno running with SportDevices SP1+, SP3, SP4, SP5 and SP6 DAQ units.Procedure may be different depending on how the dyno is constructed. In this description there is use “calibration bar” and “Calibration weight”.The purpose of calibrating the load cell is because the load cell normally is the most important factor in …

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Ratio Calibration

Important: the software only uses the Roller Channel for all calculations related to the engine (Transformation from Roller Engine scale to Torque at Engine, and Calc RPM for Graph’s Engine RPM axis). This is done in this way for two reasons: because some engines cannot always provide Engine RPM readings, for instance diesel engines or …

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