Title:
MBT DETECTING METHOD BASED ON IONIC CURRENT
Document Type and Number:
Japanese Patent JP3313882
Kind Code:
B2
Abstract:
PURPOSE: To improve detecting precision of MBT (minimum ignition advance to the optimum torque) by applying restriction, by which ionic current is gradually increased, for the predetermined duration from a start of ionic current detection, and then, releasing the restriction so as to detect a time when the current value becomes the maximum value from the ionic current from which the restriction is removed.
CONSTITUTION: During the operation of an engine, ionic current Ii inputted into an ion circuit 24a in an ionic current measuring circuit, which is connected to an ignition plug, is inputted into a drain D of a field effect transistor FET. In this process, a steppedly starting control signal CS is inputted, so that control voltage Vg impressed to the first gate G1 of FET is slowly started in a time length decided on the basis of a resistor R and a condenser C of a time constant circuit TCC. Therefore, a size of output current Iout in this time is increased with a lapse of time, and a current change starting pulse-shapedly just after a start of ionic current detection is restricted, and as a result, error detection is prevented.
Inventors:
Morito Asano
Masayuki Nishimura
Masayuki Nishimura
Application Number:
JP9881094A
Publication Date:
August 12, 2002
Filing Date:
May 12, 1994
Export Citation:
Assignee:
Daihatsu Motor Co., Ltd.
Diamond Electric Co., Ltd.
Diamond Electric Co., Ltd.
International Classes:
F02P17/12; F02D45/00; (IPC1-7): F02D45/00; F02P17/12
Domestic Patent References:
| JP634490A | ||||
| JP4140481A | ||||
| JP5654962A |
Attorney, Agent or Firm:
Kazuhiro Akazawa