ELECTRONIC DEVICE FOR DETERMINING COMPRESSION IN CYLINDERS OF INTERNAL COMBUSTION ENGINE Russian patent published in 2005 - IPC

FIELD: testing of engines.

SUBSTANCE: device comprises capacitive electronic marker of cylinder number and pulse multiplying device, which multiplies signals proportional to the current consumed by the starter and voltage drop at the terminals of the storage battery when the engine is actuated with the starter. The curve obtained at the output of the device is directly proportional to the curve of variation of compression throughout the cylinders of the engine. The first input of the pulse multiplying device is connected with the output of shunting resistance (current sensor) through a differential amplifier and voltage divider. The second input is connected with the voltage divider. The shunting resistance is connected with the wire which connects the positive terminal of the storage battery with the starter. The output of the pulse multiplying device is connected with the first input of the adder through the RC-circuit and voltage follower . The second input is connected with the output of the electronic marker of cylinder number.

EFFECT: enhanced accuracy of measuring compression.