Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preignition control method and system for flexible fuel engine, vehicle and storage medium

A technology of flexible fuel and control method, which is applied in the direction of engine control, combustion engine, fuel injection control, etc., can solve the problem of inability to effectively monitor the pre-ignition situation of flexible fuel engine, and achieve simple and reliable control method, less interference factors, The effect of high accuracy

Active Publication Date: 2021-06-11
ZHEJIANG GEELY HLDG GRP CO LTD +3
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, pre-ignition in flex-fuel engines cannot be effectively monitored using conventional means using knock sensors

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preignition control method and system for flexible fuel engine, vehicle and storage medium
  • Preignition control method and system for flexible fuel engine, vehicle and storage medium
  • Preignition control method and system for flexible fuel engine, vehicle and storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0039] In the prior art, a knock sensor is used to monitor the pre-ignition knock of the engine. However, for the flexible fuel engine, after the early combustion of the engine, the pressure in the cylinder may rise rapidly, but the pressure in the cylinder changes smoothly and basically does not fluctuate, that is, the cylinder will not vibrate strongly, because the knock sensor is Identify the vibration frequency signal generated by the fluctuation of the cylinder pressure in the cylinder, so the use of the knock sensor cannot judge the occurrence of pre-ignition of the flexible fuel engine, which may lead to engine damage. For this reason, this embodiment provides a kind of pre-ignition control method for flexible fuel engine, refer to figure 1 As shown in the schematic flow chart, the present application provides the operation steps of the method described in the embodiment or flow chart, but more or less operation steps may be included based on routine or non-creative wor...

Embodiment approach

[0043] As a specific implementation, see figure 2, to obtain the pressure threshold and pressure fluctuation integral threshold corresponding to the current engine operating conditions, including:

[0044] S201. Obtain engine speed and engine load information;

[0045] S202. Determine the current engine working condition according to the engine speed information and the engine load information; the engine working condition is the working condition of the engine. Specifically, the current engine working condition may include, for example, an idling condition, a light load condition, a medium load condition, Heavy load conditions and accelerated conditions.

[0046] S203. According to the current engine working condition, determine a pressure threshold and a pressure fluctuation integral threshold corresponding to the current engine working condition.

[0047] As a specific implementation manner, the pressure threshold and the pressure fluctuation integral threshold correspon...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a preignition control method and system for a flexible fuel engine, a vehicle and a storage medium. The preignition control method comprises the steps that the cylinder pressure of the engine is obtained; a pressure threshold value and a pressure fluctuation integral threshold value corresponding to the current engine working condition are obtained; whether the cylinder pressure meets at least one of the following conditions: the cylinder pressure is higher than the pressure threshold and the cylinder pressure exceeds the pressure fluctuation integral threshold is judged; and if yes, engine protection operation is executed. Pre-ignition of the flexible fuel engine is directly recognized through the cylinder pressure of the engine, the preignition control method has the advantages of being few in interference factor, high in accuracy and high in response speed, so that pre-ignition protection of the engine can be effectively conducted, and the control method is simple and reliable.

Description

technical field [0001] The present application relates to the technical field of engines, in particular to a pre-ignition control method, system, vehicle and storage medium of a flexible fuel engine. Background technique [0002] Pre-ignition is a phenomenon in which the mixture is ignited by the heat source in the cylinder before it is ignited by the spark plug. The characteristics of early combustion are power reduction, unstable engine operation accompanied by knocking sound (sound is dull), and high temperature overheating phenomenon. Knocking generally occurs after the spark plug is ignited. It is usually caused by the abnormal compression ratio of the combustible gas mixture. The early combustion and knocking of the engine have a relatively large impact on the engine, which are caused by the abnormal combustion of the combustible mixture in the cylinder. Pre-ignition will occur along with deflagration. After a long-term operation of a gasoline fueled engine, the oil...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): F02D41/22
CPCF02D41/22F02D2041/227Y02T10/40
Inventor 杨万里沈源李红洲金先扬吴建财李延鹏洪安新
Owner ZHEJIANG GEELY HLDG GRP CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com