Control device of ignition timing in internal-combustion engine

Abstract

Abstract PURPOSE:To improve drivability of an engine, by utilizing a correction record of ignition timing in an MBT control (control where the ignition timing is corrected on the basis of a crank angle for the maximum pressure in a cylinder) in the past to an arithmetic operation of the present ignition timing. CONSTITUTION:An ignition timing control device provides a decision means C deciding whether or not an engine is in a transient operational condition on the basis of the detection result in an operational condition detecting means B detecting an operational condition of the internal-combustion engine. And the control device, in which a correction quantity of ignition timing obtained by the ignition timing control device A on the basis of a crank angle thetapmax, when a maximum pressure is generated in a combustion chamber, is stored as a study value in a memory means D corresponding to the detection result of the operational condition only when it is decided that the engine is not in the transient operational condition, calculates the ignition timing by an arithmetic means E on the basis of said study value and the basic ignition timing. While the control device, when the decision means C decides that the engine is in the transient operational condition, interrupts by an interrupting means F a correction control of the ignition timing on the basis of the crank angle thetapmax.

Inventors

• 👤 Yoshihisa Kawamura
• 👤 川村　佳久
• 👤 Shuzo Fukuzumi
• 👤 福住　周三

Bibliographic Details