Patent ID: 6975935

Claim:
A device for detecting the rotation direction of a piston engine, which includes at least one cylinder, a piston movable back and forth in the cylinder, a cylinder chamber formed inside the cylinder which is delimited by an inner cylinder wall and the piston, an inlet channel which opens into the cylinder chamber via at least one inlet valve, an outlet channel which opens into the cylinder chamber via at least one outlet valve, at least one triggerable throttling device situated in the inlet channel, the device comprising: a control arrangement to control the piston engine; a measuring arrangement to measure a rotational speed; a triggering arrangement to trigger the throttling device; and a measuring arrangement to measure a pressure in the inlet channel when the inlet valve is open and the throttling device is closed; wherein the control arrangement causes the throttling device to close when a rotary motion is detected, measures a pressure in the inlet channel after a predefinable measuring period, compares the measured pressure with a predefinable threshold value to provide a comparison result, and determines the rotation direction of the piston engine based on the comparison result.