I have now once again improved the way I measure volume displacement because the previous method was not acceptable. This time I am monitoring piston displacement in real time by using a hall effect sensor that provides the flywheel/crank angle. The sensor is positioned concentric to the flywheel where I have located a magnet.
Crank angle, A (see diagram below) is the angle measured from cylinder bore centerline at top dead center (TDC).
Next, by applying the Cosine Law in the following function, I was able to calculate the reciprocating motion of the piston with respect to the crank angle.
Crank angle, A (see diagram below) is the angle measured from cylinder bore centerline at top dead center (TDC).
The sensor data also allows for some more interesting information like being able to view the piston acceleration with respect to the crank angle or time. With the sensor now fitted I can now accurately view and measure the Volume displacement alongside pressure changes. Below is a screen grab of various engine data being observed.
I am also experimenting with my RPM function by adding a smoothing function.
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