US 11,740,159 B2
Measuring method and system for determining piston movement within engine
Chang-Ju Kim, Daejeon (KR); Ju-Kyeong Kim, Daejeon (KR); Myung-Rae Cho, Seoul (KR); and Sang-Jae Lee, Hwaseong-si (KR)
Assigned to TJTENG CO., LTD., Daejeon (KR); and Chang-Ju Kim, Daejeon (KR)
Appl. No. 17/621,064
Filed by TJTENG CO., LTD., Daejeon (KR); and Chang-Ju Kim, Daejeon (KR)
PCT Filed Dec. 17, 2020, PCT No. PCT/KR2020/018524
§ 371(c)(1), (2) Date Dec. 20, 2021,
PCT Pub. No. WO2021/125823, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 10-2019-0170819 (KR), filed on Dec. 19, 2019.
Prior Publication US 2022/0349780 A1, Nov. 3, 2022
Int. Cl. G01M 15/06 (2006.01)
CPC G01M 15/06 (2013.01) 5 Claims
OG exemplary drawing
 
1. A measuring system for a vehicle engine to determine whether a piston motion is normal in the vehicle engine including having a crank shaft, the connecting rod and a piston, the measuring system comprising:
a probe configured to be screw-coupled to a location where a spark plug is to be mounted in a state where a lower portion of the spark plug is separated from the vehicle engine, the probe including measuring rod extending from the center thereof, wherein an end portion of the measuring rod is located at the center of the upper surface of the piston and is located at a top dead point of the piston according to rotation of the crank shaft in order to measure the top dead point of the piston and to output a corresponding signal value;
an air supplier configured to be connected with a tube to supply air into an air path formed in the probe and to apply pressure to the piston, the air supplier configured to sense air pressure;
an air inhaler configured to be connected with the tube to inhale air through the air path formed in the probe in order to make the inside of the cylinder chamber in a vacuum state, the air inhaler configured to sense air pressure;
a control unit configured to operate the air supplier and the air inhaler through a signal value of the probe, to receive signal values generated from the air supplier and the air inhaler, to compare the signal values with stored memory values in order to determine whether or not the engine works normally, and to output the determination result to a display unit; and
a rotary jig configured to rotate the crank shaft.