INTAKE AIR CONTROL UNIT FOR INTERNAL COMBUSTION ENGINE

Japanese Patent JP3436173

B2

PROBLEM TO BE SOLVED: To enhance startability by restraining excessive changes of intake air quantity under the open state of a switch valve at the completion of fully closed control over the switch valve, at a starting process of a multi-cylinder internal combustion engine having an electronic control switch valve.
SOLUTION: In an internal combustion engine, having an electronic control switch valve in an intake duct, the opening of the switch valve is controlled at a starting process of the engine so as to attain a first opening which is an approximately fully closed state. Then air consumption consumed in and after cranking of the engine with the first opening for the switch valve is determined. Based on the determined value of the air consumption, a consumption ratio of an intake system air quantity existing within the intake duct from downstream of the switch valve up to intake valves of respective cylinders is determined. By multiplying the consumption ratio and an intake air quantity required to intake after the completion of the fully closed control, air quantity at the transition to an open valve state is determined. Comparing the second opening and the first opening of the switch valve through which the air quantity under transition passes, the opening of the switch valve is controlled so as to attain a greater opening. As a result, excessive changes of intake air quantity are restrained, while the switch valve is in the open state at the starting process of the engine, and thus an engine startability is improved.

Masanobu Kanamaru
Hiroki Ichinose
Satoshi Watanabe

JP6034199A

August 11, 2003

March 08, 1999

Click for automatic bibliography generation  

TOYOTA JIDOSHA KABUSHIKI KAISHA

F02D9/02; F02D41/06; (IPC1-7): F02D41/06; F02D9/02

JP9324677A
JP9280061A
JP7310636A
JP10205381A
JP8303272A

Takashi Ishida (3 others)

Previous Patent: MANUFACTURE OF SEMICONDUCTOR DEVICE

Next Patent: COMMUNICATION METHOD