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The Atkinson-cycle engine is a type of internal combustion engine invented by James Atkinson in 1882. The Atkinson cycle is designed to provide efficiency at the expense of power density. A modern variation of this approach is used in some modern automobile engines. While originally seen exclusively in hybrid electric applications such as the earlier-generation Toyota Prius, later hybrids and some non-hybrid vehicles now feature engines with variable valve timing, which can run in the Atkinson cycle as a part-time operating regimen, giving good economy while running in Atkinson cycle, and conventional power density when running as a conventional, Otto cycle engine.
An exhaust gas flow rate diagnosis method, an engine management device, a medium, and a controller
The present application belongs to the technical field of vehicle engineering, and particularly relates to a waste gas flow diagnosis method, an engine management device, a medium and a controller; on the basis of an exhaust gas recirculation (EGR) cooling water path, an EGR bypass branch is added; by cutting off the medium circulation of the EGR cooler part and maintaining the medium circulation of the remaining part through the bypass branch, a heat exchange layout for fault diagnosis is constructed; based on the temperature rise performance of the EGR cooler in the detection process, the diagnosis of low flow faults and high flow faults can be realized respectively, and it is particularly suitable to be implemented in combination with the self-checking process during the engine warm-up process; during this period, it is not necessary to collect EGR temperature sensor data, which is conducive to reducing the integration difficulty of high-pressure EGR parts; and it has a higher detection rate and a better monitoring frequency IUPR (In Use Performance Ratio) for the above faults; in addition, good results can also be achieved for engines using Atkinson cycle combined with high-pressure EGR technology.
Owner:UNITED AUTOMOTIVE ELECTRONICS SYST