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Variable valve timing (VVT) adjusting method of engine and device

A technology of valve timing and adjustment method, which is applied in the direction of engine components, engine control, combustion engine, etc., and can solve problems such as degraded engine

Active Publication Date: 2010-06-23
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem in the prior art that the predetermined VVT strategy is no longer applicable to the engine due to the deterioration of the intake and exhaust systems after the engine has been used for a period of time, the embodiment of the present invention proposes an engine variable valve timing adjustment system and methods

Method used

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  • Variable valve timing (VVT) adjusting method of engine and device
  • Variable valve timing (VVT) adjusting method of engine and device
  • Variable valve timing (VVT) adjusting method of engine and device

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Embodiment 1

[0046] The embodiment of the present invention proposes a method for adjusting the variable valve timing of the engine, the process of which is as follows figure 1 shown, including:

[0047] Step 101, read the air-fuel ratio value of the engine,

[0048] Step 102, judge whether the back pressure of the intake air and exhaust gas is abnormal according to the value of the air-fuel ratio, if it is, go to step 103, otherwise the step ends;

[0049] Step 103, read the intake air pressure measurement value measured by the intake system sensor, and compare it with the standard value to obtain the intake system pressure difference ΔP1, and calculate the intake pressure change rate of the intake system from ΔP1;

[0050] Step 104, read the time difference t2 between the front end and the rear end of the three-way catalytic converter of the engine in response to the air-fuel ratio, calculate the pressure change difference ΔP2 of the three-way catalytic converter, and calculate the exha...

Embodiment 2

[0054] As an improvement of the above-mentioned embodiment 1, the method of the above-mentioned embodiment 1 can be specifically:

[0055] Step 201, the engine control unit measures the ambient pressure through the intake pressure sensor installed on the engine intake system, and judges whether it is operating in a plateau environment according to the ambient pressure, and if so, corrects the VVT ​​target value according to the preset plateau correction coefficient , the step ends; otherwise, jump to step 202;

[0056] Step 202: After starting the engine for t1 time, perform open-loop air-fuel ratio control, and read the air-fuel ratio value; if the difference between the air-fuel ratio value and the standard value is less than the preset threshold value, if so, go to step 203, otherwise send an alarm message, The step ends; this is because once the difference between the air-fuel ratio value and the standard value is too large, it means that the engine has an important proble...

Embodiment 3

[0074] The embodiment of the present invention also proposes an engine variable valve timing adjustment device, including an engine control unit, such as figure 2 shown, also includes:

[0075] The air-fuel ratio detection module 1 reads the air-fuel ratio value of the engine, and judges whether the back pressure of the intake air and exhaust gas is abnormal according to the air-fuel ratio value;

[0076] The intake system sensor module 2 is arranged in the intake system of the engine to detect the intake pressure measurement value of the intake system of the engine;

[0077] Intake pressure change rate calculation module 3, compares the intake pressure measurement value with the standard value to obtain a difference ΔP1, and calculates the intake pressure change rate of the intake system from ΔP1;

[0078] The exhaust system sensor module 4 is arranged at the front end and the rear end of the three-way catalytic converter of the engine to detect the air-fuel ratio response ...

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Abstract

The invention discloses a variable valve timing (VVT) adjusting method of an engine and a device, belonging to the technical field of the engine. The invention obtains the current work status of the engine by timely detecting the pressure change of an air inlet system and an air outlet system of the engine, modifies a VVT strategy according to the current work status of the engine, and updates the target value of the existing VVT strategy by taking a modified result as the target value of a new VVT strategy. The invention is mainly applied to the field of the engine, can dynamically adjust the VVT target value according the latest work status of the engine, and can better set the VVT strategy for the engine compared with the prior art that the VVT strategy only can be generated according to the preset target value, thereby changing the problems that the VVT strategy not only can not be best played but also can worsen the performance of the engine along with the aging of the engine in the prior art.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to an engine variable valve timing adjustment method and device. Background technique [0002] Engine VVT ​​(Variable Valve Timing, variable valve timing technology) is a new technology that has been gradually applied to cars in recent years. Its principle is to adjust the valve timing in a timely manner according to the operating conditions of the engine, control the internal EGR (Exhaust Gas Recirculation, exhaust gas recirculation system) rate of the internal engine and increase the intake charge to reduce the pumping loss and improve the engine's efficiency. torque and power while improving engine fuel economy and emissions performance, idle stability and low-temperature cold start performance. [0003] If the engine VVT ​​technology is to be used to improve the performance of the engine, different control algorithms and strategies need to be developed and implemented in the en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L1/34F02D13/02
CPCY02T10/18Y02T10/12
Inventor 贾志超
Owner CHERY AUTOMOBILE CO LTD
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