Development and Validation of a Variable Displacement Variable Compression Ratio Miller Cycle Technology on an Automotive Gasoline Engine Article Swipe
Huiyong Yang
,
Lei Zhang
,
Jingping Liu
,
Jianqin Fu
,
Dazi Shen
,
Zhipeng Yuan
·
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.3390/en16114480
YOU?
·
· 2023
· Open Access
·
· DOI: https://doi.org/10.3390/en16114480
At partial load, traditional automotive gasoline engines have high pumping losses due to the throttling of the intake charge for load control. Variable Valve Timing (VVT) and the introduction of externally cooled EGR could reduce the pumping losses but only with a very limited effect. On the other hand, in the medium to full load range, the engine cannot utilize a high compression ratio due to limitations in knocking. A variable displacement, variable compression ratio device which utilizes an asymmetric camshaft to realize the different closure times of the two intake valves is discussed in this paper. The large-scale change in the intake valve timing leads to the large-scale change in the effective cylinder volume at the intake valve closure, which realizes a variable cylinder volume and a variable effective compression ratio. The device is utilized to reduce the pumping losses and to increase the in-cylinder thermal efficiency at the same time. Engine dyno test results indicate that, in the low to medium load range, a later closure of the intake valve could reduce the effective cylinder volume, and the intake pressure could be significantly increased, and therefore pumping losses reduced. However, the reduced effective cylinder volume due to a later intake valve closure would lead to reduction in the effective compression ratio (ECR) and a drop in in-cylinder thermal efficiency. Therefore, there is a balance point between the pumping loss reduction and the drop in in-cylinder thermal efficiency. On the other side, in the medium to full load range, when avoiding knocking becomes the major controlling factor of the combustion phasing (degree of constant-volume combustion) and the effective expansion ratio (EER), too high of an effective compression ratio would lead to significant drop in the effective expansion ratio EER and also the in-cylinder thermal efficiency. Therefore, there exists a best compromise between the ECR and EER, and the best system would be one with a moderate ECR but an EER as high as possible. The quantitative equations which include both ECR and EER in the thermal efficiency calculations captured the above observations pretty well and can be utilized to optimize for the best compromise of IVC, EVO, ECR, EER and engine performances during the concept stage and/or the calibration stage of an engine.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.3390/en16114480
- https://www.mdpi.com/1996-1073/16/11/4480/pdf?version=1685622069
- OA Status
- gold
- Cited By
- 2
- References
- 19
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4379144723
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4379144723Canonical identifier for this work in OpenAlex
- DOI
-
https://doi.org/10.3390/en16114480Digital Object Identifier
- Title
-
Development and Validation of a Variable Displacement Variable Compression Ratio Miller Cycle Technology on an Automotive Gasoline EngineWork title
- Type
-
articleOpenAlex work type
- Language
-
enPrimary language
- Publication year
-
2023Year of publication
- Publication date
-
2023-06-01Full publication date if available
- Authors
-
Huiyong Yang, Lei Zhang, Jingping Liu, Jianqin Fu, Dazi Shen, Zhipeng YuanList of authors in order
- Landing page
-
https://doi.org/10.3390/en16114480Publisher landing page
- PDF URL
-
https://www.mdpi.com/1996-1073/16/11/4480/pdf?version=1685622069Direct link to full text PDF
- Open access
-
YesWhether a free full text is available
- OA status
-
goldOpen access status per OpenAlex
- OA URL
-
https://www.mdpi.com/1996-1073/16/11/4480/pdf?version=1685622069Direct OA link when available
- Concepts
-
Compression ratio, Bandwidth throttling, Valve timing, Automotive engineering, Mean effective pressure, Cylinder, Thermal efficiency, Materials science, Camshaft, Internal combustion engine, Engineering, Mechanical engineering, Combustion, Chemistry, Gas compressor, Organic chemistryTop concepts (fields/topics) attached by OpenAlex
- Cited by
-
2Total citation count in OpenAlex
- Citations by year (recent)
-
2025: 2Per-year citation counts (last 5 years)
- References (count)
-
19Number of works referenced by this work
- Related works (count)
-
10Other works algorithmically related by OpenAlex
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