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A hidi-based learning method for air-fuel ratio control

A learning method, air-fuel ratio technology, applied in fuel injection control, electrical control, engine control, etc., can solve problems such as increased emissions, and achieve the effect of ensuring cold start and cold engine performance

Active Publication Date: 2019-01-25
费尼亚德尔福汽车系统(上海)有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the cold performance of the engine, a rich air-fuel ratio is required; on the other hand, if the air-fuel ratio is too rich, too much gasoline will be discharged from the engine, resulting in increased emissions (hydrocarbons and carbon monoxide)

Method used

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  • A hidi-based learning method for air-fuel ratio control

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Embodiment

[0026] The combustion stability of a gasoline engine under cold engine conditions has a great relationship with the volatile HIDI of gasoline. HIDI is defined as if the HIDi is higher, a richer air-fuel ratio is required to ensure the drivability of the cold engine, so a richer air-fuel ratio will be used.

[0027] In the actual application process, the air-fuel ratio of the cold engine of the engine management system (EMS) will be calibrated based on standard gasoline, and the calibrated air-fuel ratio is temporarily called the standard air-fuel ratio. Generally, standard gasoline has better volatility and lower HIDI value; when encountering gasoline with a higher HIDI value, the actual air-fuel ratio used is the air-fuel ratio that is richer than the standard air-fuel ratio.

[0028] HIDI decision logic – cold engine engine speed drops (Engine Speed ​​Heavy Drop)

[0029] The natural law of the engine cold start process is that the engine speed will rush from the drag speed...

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Abstract

The invention relates to an air-fuel ratio control learning method based on HIDI. The method comprises the following steps: 1) performing engine cold start and rotating speed measurement, defining HIDI index as HIDIMULF, and cold engine operation air-fuel ratio as OpenA / F; 2) determining whether rotating speed of the engine decreases; 3) HIDIMULF=HIDIMULF+Delta2, Open A / F= Open A / Fx(1- HIDIMULF); 4) determining whether rotating speed of the engine decreases to a limiting value, if yes, performing step 5), if no, performing step 6); 5) HIDIMULF= HIDIMULF+ Delta1, Open A / F= Open A / Fx(1- HIDIMULF); 6) determining whether used gasoline goes back to standard gasoline, if yes, performing step 7), if no, performing step 8); 7) recovering HIDI and air-fuel ratio; 8) the engine starting normally. Compared with the prior art, the method is advantaged by good compensation performance and dynamic learning capability.

Description

technical field [0001] The invention relates to an engine air-fuel ratio control method, in particular to a HIDI-based air-fuel ratio control learning method. Background technique [0002] The volatility of gasoline will directly affect the cold engine idling stability of the engine, so the index of gasoline stability in cold engine is defined as HIDI (High Drivability Index). In order to ensure the cooling performance of the engine, a rich air-fuel ratio is required; on the other hand, if the air-fuel ratio is too rich, too much gasoline will be discharged from the engine, resulting in increased emissions (hydrocarbons and carbon monoxide). Contents of the invention [0003] The purpose of the present invention is to provide a HIDI-based air-fuel ratio control learning method with good compensation performance and strong dynamic learning ability in order to overcome the above-mentioned defects in the prior art. [0004] The purpose of the present invention can be achieve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/14
Inventor 董团结
Owner 费尼亚德尔福汽车系统(上海)有限公司