US 10,458,357 B2 · Method for diagnosing and controlling two-step exhaust variable valve lift system and vehicle provided with the same method

Abstract

Disclosed herein is a method for diagnosing and controlling a two-step exhaust variable valve lift (VVL) system, including: a controlling device acquiring an operation state signal of a vehicle; when the vehicle is in the over-run state, the controlling device outputting a mode conversion signal of the two-step exhaust VVL system; an air mass sensor measuring an air mass entering an engine, and the controlling device comparing a predetermined prediction value of the air mass with the measured air mass; when a difference of the compared air mass corresponds to a predetermined mode conversion comparing amount, the controlling device determining that a mode conversion of the two-step exhaust VVL system is completed; and when the difference of the compared air mass does not correspond to the mode conversion comparing amount, the controlling device determining that the two-step exhaust VVL system is faulty and outputting a result thereof.

Claims9

Dependent claims

A method for diagnosing and controlling a two-step exhaust variable valve lift (VVL) system, the method comprising:

acquiring, by a controller, an operation state signal of a vehicle to determine whether or not the vehicle is in an over-run state;
when the vehicle is in the over-run state, outputting, by the controller, a mode conversion signal of the two-step exhaust VVL system;
measuring, by an air mass sensor, an air mass entering an engine, and comparing by the controller, a predetermined prediction value of the air mass with the measured air mass;
when a difference of a compared air mass corresponds to a predetermined mode conversion comparing amount, determining, by the controller, that a mode conversion of the two-step exhaust VVL system is completed;
and
when the difference of the compared air mass does not correspond to the mode conversion comparing amount, determining, by the controller, that the two-step exhaust WI, system is faulty and outputting, by the controller, a fault signal as a result thereof.

3 more elements

A vehicle provided with a two-step exhaust variable valve lift (VVL) system, the vehicle including:

an accelerator pedal sensor measuring an operation angle of an accelerator pedal and outputting a corresponding signal;
a vehicle speed sensor measuring speed of the vehicle and outputting a corresponding signal;
and
an air mass sensor measuring an air mass entering an engine,
wherein the two-step exhaust VVL system includes:
a controller receiving vehicle state signals including the corresponding signal of the accelerator pedal sensor and the vehicle speed sensor to determine whether or not the two-step exhaust VVL system enters a diagnosis mode and outputting a mode conversion signal of the two-step exhaust VVL system;
a timer measuring a conversion delay time between an output time of the mode conversion signal and an operation completion time of the two-step exhaust VVL system;
a memory storing the conversion delay time;
and
an engine management system operated over the stored conversion delay time by a control of the controller.

7 more elements

Dependencies are inferred from the claim text.

Method for diagnosing and controlling two-step exhaust variable valve lift system and vehicle provided with the same method

Life of this patent

Method for diagnosing and controlling two-step exhaust variable valve lift system and vehicle provided with the same method

Life of this patent

Abstract

Claims9