Technical Paper
Development of a method to predict performance of sensing system with air mass flow sensor by CFD
2020-01-24
2019-32-0610
With the strengthening of exhaust gas regulations such as EU Stage 5 and China’s 4th regulation, the engine such as external EGR and aftertreatment device has become complicated. In addition, Kubota’s industrial engines are used not only in agricultural and construction machines but also in various machines with different applications around the world, there are many variations of intake and exhaust systems, and the engines are diversified. For an engine adopting an external EGR and a aftertreatment device, a hot wire type mass air flow rate sensor is widely adopted in an intake piping in order to control the EGR valve appropriately and the regeneration control of the DPF. However, it is known that the sensitivity of this sensing system varies depending on the shape of the intake piping. When the sensitivity varies, the engine is controlled based on the incorrect air mass flow rate, so that the exhaust performance may be deteriorated.