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Method for adapting an engine to the fuel grade by decrementing the initial octane number of the fuel

A technology of engine and octane number, which is applied in the direction of combustion engine, internal combustion piston engine, engine ignition, etc., and can solve the problems of combustion chamber damage, correction device is not ideal, lack of performance and fineness, etc.

Active Publication Date: 2012-04-11
RENAULT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, these correction devices are not ideal
Specifically, they either lack the performance and sophistication associated with the detected octane rating, or are always on the verge of detecting knock, which can lead to sustained damage to the combustion chamber

Method used

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  • Method for adapting an engine to the fuel grade by decrementing the initial octane number of the fuel
  • Method for adapting an engine to the fuel grade by decrementing the initial octane number of the fuel
  • Method for adapting an engine to the fuel grade by decrementing the initial octane number of the fuel

Examples

Experimental program
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Embodiment Construction

[0043] figure 1 Shows the operating range of the engine, where the axis of abscissa represents revolutions per minute and the axis of ordinate represents engine load in N.m, also called torque. The curves represent the maximum performance of the engine.

[0044] In this figure, there is a grid consisting of eighteen regions numbered from 0 to 17.

[0045] Zone 0, set below a specific torque, does not require any specific advance adjustments, since knocking is rare and there is therefore little risk of damage to the combustion chamber.

[0046] A region 17 is defined above the specified speed in which knocking becomes difficult to detect. Correction values ​​from previously traversed regions are therefore applied here.

[0047] Regions 1-16 each include a slow loop (BL) anti-knock correction value to be applied to spark advance.

[0048] For example, zone 1 could have a correction of 2° (BL_1), zone 2 a correction of 5° (BL_2), zone 3 a correction of 4° (BL_3), and zone 4 a...

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Abstract

The invention relates to a method for adapting an engine to the octane number of the fuel by decrementing the initial octane number. Starting with a reference setting of the spark advance in an engine operating range (10) for a given octane number, the engine operating range (10) being divided into a plurality of zones (1 to 16), each including an anti-pinking corrective value of the spark advance of the reference setting, the engine is switched to a reference setting that corresponds to a lower octane number: when a threshold value (S l_2 to S 16_2) of the advance correction loop is exceededin at least one zone, or when a counter of the number of zones, in which another threshold value (S l_l to S 16_l) of the advance correction loop is exceeded, exceeds a multi-zone threshold (S3).

Description

technical field [0001] The invention relates to a method of adapting an engine to the abundance of a fuel, in particular to the octane number of the fuel. In particular, the invention relates to controlled ignition engines, the ignition advance of which can be controlled electronically. More specifically, the invention relates to a method of adaptation by decrementing (decreasing, reducing) the known octane number (learned octane number, empirical octane number) of the fuel. Background technique [0002] Various different types of fuels are currently available with different properties. These properties include octane rating. Octane numbers may generally take approximate values ​​of 98, 95, 91 and 87 in different fuels. Fuels with an octane rating of 98 and 95 are often used in Western Europe, fuel with an octane rating of 91 can be encountered in the United States, and fuel with an octane rating of 87 is used, for example, in Iran. [0003] In order to optimize the trad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02P5/152
CPCY02T10/46F02P5/1523F02P5/1527Y02T10/40
Inventor F·潘托E·瓦朗西安纳
Owner RENAULT SA