Flexible fuel engine with alterable compression ratio and control method thereof

A technology of flexible fuel and control method, applied in the direction of engine control, combustion engine, internal combustion piston engine, etc., which can solve the problems of prone to knocking, low thermal efficiency, and inability to adapt to the combustion characteristics of different fuels

Inactive Publication Date: 2008-02-27
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current flexible fuel engine has a fixed compression ratio, which cannot adapt to the combustion characteristics of different fuels. After fuel replacement, the thermal efficiency is low, and abnormal combustion phenomena such as knocking are prone to occur; fuel replacement during driving may easily lead to unstable engine operation, etc. unusual phenomenon

Method used

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  • Flexible fuel engine with alterable compression ratio and control method thereof
  • Flexible fuel engine with alterable compression ratio and control method thereof

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Experimental program
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Embodiment approach 1

[0018] Embodiment 1: When gasoline fuel is used, the engine ECU receives the signal returned by the fuel sensor, adjusts the engine compression ratio to 8-10 through adjustment method 1 or adjustment method 2, and adjusts the combustion control strategy at the same time, and through VVT The mechanism adjusts the valve timing of the engine. At the same time, adjust the injection pressure of the fuel injector at 5-6MPa to adapt to the combustion characteristics of gasoline fuel.

Embodiment approach 2

[0019] Embodiment 2: When diesel or biodiesel fuel is used, the engine ECU receives the signal returned by the fuel sensor, adjusts the engine compression ratio to 14-18 by adjusting mode 1 or mode 2, and adjusts the combustion control strategy at the same time, And adjust the engine valve timing through the VVT ​​mechanism. At the same time, adjust the injection pressure of the fuel injector at 100-200MPa to adapt to the combustion characteristics of diesel or biodiesel fuel.

Embodiment approach 3

[0020] Embodiment 3: When methanol fuel is used, the engine ECU receives the signal returned by the fuel sensor, adjusts the engine compression ratio to 10-12 through adjustment method 1 or adjustment method 2, and adjusts the combustion control strategy at the same time, and through VVT The mechanism adjusts the valve timing of the engine. At the same time, adjust the injection pressure of the fuel injector at 5-6MPa to adapt to the combustion characteristics of methanol fuel.

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Abstract

The present invention discloses one kind of engine with changeable compression ratio and changeable fuel and its control method. The engine includes one combustion system, one fuel pressure regulating system, one liquid fuel providing system, one gas fuel providing system, one changeable gas valve timing mechanism, one electronic control unit and one sensor module. According to the acquired signal, the electronic control unit determines the current fuel type, regulates the compression ratio, combustion controlling strategy and gas distribution phase of the engine and regulates the pressure of the fuel injector, so as to fit the fuel. The engine of the present invention can burn gas fuel, liquid fuel and mixed fuel, and has compression ratio adjustable in 8-18 and high dynamic performance and economic performance in burning different types of fuel.

Description

technical field [0001] The invention belongs to the field of internal combustion engines, and in particular relates to a flexible fuel engine with a VVT mechanism, variable compression ratio, and the ability to use various fuels and a control method thereof. Background technique [0002] With the increasing scarcity of oil resources, the problem of automobile energy has become a bottleneck restricting the development of the automobile industry. In order to solve the problem of automobile energy, automobile manufacturers all over the world have introduced various new fuel engines, such as BMW's hydrogen fuel engine, ethanol gasoline E80 automobiles from companies such as the United States, and automobiles using CNG and LPG. The emergence of these new energy vehicles has greatly eased the impact of the oil crisis on consumers' daily lives. However, the emergence of various new energy vehicles has caused great inconvenience to the travel of users. During long-distance driving,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D19/06F01L13/00F02D13/02
CPCF02D19/0689Y02T10/36F02D19/0655F02D19/087F02D15/04F02D19/0644Y02T10/30
Inventor 杨俊伟汤绪雯
Owner CHERY AUTOMOBILE CO LTD
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