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An experiment of internal exhaust gas recirculation(EGR) thermal management was conducted on a six-cylinders turbocharged diesel engine equipped with the fully hydraulic variable valve system(FHVVS) at medium load conditions. The cylinder pressure, intake and exhaust dynamic pressure, exhaust temperature and fuel consumption rate were measured to investigate the influence of internal EGR based on secondary opening of exhaust valves on the exhaust thermal management performance experiment. The concept of fuel consumption to temperature rise ratio λ was proposed to represent the additional fuel consumption rate when the exhaust temperature increases by every 100℃ in the certain thermal management mode. The results indicated that the recirculation of the high-temperature oxygen-containing exhaust gas from exhaust pipe during the intake stroke significantly reduces the intake flow rate and increases the exhaust temperature. Compared to thermal management of an intake throttle with the same intake flow rate, the internal EGR thermal management significantly reduces the pressure difference between the exhaust and intake, leading to a pump loss reduction of more than 62.2% and a fuel consumption rate reduction of 4.26%—6.62%. By using the compound thermal management of “internal EGR+throttle”, the exhaust temperature increases significantly to 522℃ under the rotating speed of 1200r/min and medium load condition, and the λ is only 3.0g/(kW·h)·(100℃), while as high as 9.6g/(kW·h)·(100℃) for the throttle mode under the same intake flow.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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