公开(公告)号：JPH07167854A

公开(公告)日：1995-07-04

申请号：JP22544094

申请日：1994-09-21

Applicant: WESTERN ATLAS INT INC

Inventor： PEETAA SHII FURENCHI ,  SUTEIIBUN PAANA ,  JIYOO BAUSU SHINIA ,  HAABEI FUERAA

IPC: G01N33/22 ,  F02D15/04 ,  F02D41/02 ,  F02M19/01 ,  G01N33/28

Abstract: PURPOSE: To calculate an octane value from both of air-fuel ratio and amount of printer by calibrating a device in accordance with various data which is input by supplying a reference fuel, setting knock strength set point for amount of cylinder which is compensated by an octane value of the reference fuel, adjusting an air-fuel ratio in accordance with it, and adjusting an amount of printer in accordance with it by a fuel to be checked. CONSTITUTION: An operator inputs initialized data on a display 156 by using a function key 160, etc., to calibrate knock.strength by using a knock meter 152 and the display 156. Next, a mechanical digital counter of an engine is set to a value which is not compensated yet based on an instruction of the display 156 to compensate an amount of cylinder. Then, a knock strength set point is set by using the initialized data, and air-fuel ratio search is conducted until it reaches a peak knock strength to set a micro valve 58. It is exchanged with a sample to be checked, and the amount of cylinder is adjusted until knock strength set point is achieved while operating at peak air-fuel ratio to obtain an octane value from the position and the air-fuel ratio.