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Variable valve control system and method for multi-cylinder internal combustion engine

A technology of valve control system and multi-cylinder internal combustion engine, which is applied in the field of calibration or learning process of reference position, and can solve problems such as limitation of control range

Inactive Publication Date: 2008-04-16
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, this is undesirable since the control range of the lift characteristic is limited

Method used

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  • Variable valve control system and method for multi-cylinder internal combustion engine
  • Variable valve control system and method for multi-cylinder internal combustion engine
  • Variable valve control system and method for multi-cylinder internal combustion engine

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Embodiment Construction

[0013] Reference will now be made to the accompanying drawings for a better understanding of the invention.

[0014] A preferred embodiment of a variable valve control system for an intake valve of a spark ignition gasoline internal combustion engine for a vehicle according to the present invention will be described below. FIG. 1 shows an embodiment of a variable valve control system suitable for a V-shaped six-cylinder gasoline internal combustion engine according to the present invention.

[0015] In FIG. 1, variable valve operating mechanisms 2 (2R, 2L) to be described later are mounted on intake valves 3 of left and right cylinder banks RB, LB, respectively. It should be noted that the operating mechanism on the exhaust valve 4 is a direct drive type operating mechanism, which drives the exhaust valve by means of the exhaust camshaft 5, and its valve lift characteristic is always constant.

[0016] The exhaust manifolds 6 of the left and right cylinder banks LB and RB are...

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Abstract

In variable valve control system and method for a vehicular multi-cylinder internal combustion engine, a first learning timing at which a reference position of a lift characteristic is learned for a first cylinder group is deviated from a second learning timing at which the reference position is learned for a second cylinder group.

Description

technical field [0001] The present invention relates to a variable valve control system and method for a multi-cylinder internal combustion engine (of a vehicle) in which each of a plurality of cylinder banks is equipped with a variable valve that continuously changes the lift characteristics of the intake or exhaust valves Valve operating mechanism, and more specifically, the present invention relates to a technique of correction or learning (correction learning) process of a reference position of the above-mentioned lift characteristic. Background technique [0002] In internal combustion engines, particularly in gasoline internal combustion engines that generate output according to the amount of intake air, a variably operated valve mechanism that changes the lift characteristics of intake valves in accordance with engine driving conditions is used so that Improve fuel consumption. Japanese Patent Application First Publication No. 2002-180856 published on June 26, 2002 e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D13/00F01L13/00F01L1/34F02D13/02F02D41/00F02D41/12F02D41/24F02D41/34
CPCF02D13/0207F02D41/2441Y02T10/18F02D2041/001F02D41/2438F01L13/0015F02D41/0082F01L1/34F02D41/123F02D41/2464F01L2800/00F01L2820/032F01L2013/0073Y02T10/12
Inventor 荒井胜博川村克彦
Owner NISSAN MOTOR CO LTD