Engine Indicated Torque Estimation of a Naturally Aspired Gasoline Engine
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ght © 2020 KSAE/ 11713 pISSN 12299138/ eISSN 19763832
ENGINE INDICATED TORQUE ESTIMATION OF A NATURALLY ASPIRED GASOLINE ENGINE Jinrak Park1), Seibum Choi1)*, Jiwon Oh2) and Jeongsoo Eo2) Department of Mechanical Engineering, KAIST, Daejeon 34141, Korea Research and Development Division, Hyundai Motor Group, 150 Hyundaiyeonguso-ro, Namyang-eup, Hwaseong-si, Gyeonggi-do 18280, Korea 1)
2)
(Received 30 September 2019; Revised 29 November 2019; Accepted 2 December 2019) ABSTRACTThe information of clutch transmitted torque is needed when controlling a clutch in a vehicle powertrain. However, engine indicated torque is a very important variable when estimating the clutch torque. The engine indicated torque is generally estimated as a function of engine rotational speed and the mass flow rate of air from an intake manifold into cylinders, which is referred as port air mass flow. The port air mass flow cannot be measured but should be estimated in a real vehicle. In previous studies, the port air mass flow was estimated using the information of the mass flow rate of air into the intake manifold through a throttle plate, which is referred as throttle air mass flow, and the information of air pressure in the intake manifold together. However, this study proposes a new estimation method of the port air mass flow using only the information of the throttle air mass flow. In addition, the engine indicated torque is estimated using the estimated port air mass flow and compared with the measured value. The estimation method of the port air mass flow and engine indicated torque, presented in this study, is verified with production engine experiments. KEY WORDS : Engine indicated torque, Engine torque, Naturally aspired engine, Gasoline engine, Mass flow rate
NOMENCLATURE Tind Hu i m· f e m· ao Lth vol Vd Pman Tman Vman R k ma m· a m· ai Ma
Mai
Mao
: engine indicated torque, N∙m : fuel energy constant, N∙m/kg : thermal efficiency multiplier, : fueling rate, kg/s : engine crankshaft rotational speed, rad/s : port air mass flow, kg/s : air fuel equivalent ratio, : stoichiometric air fuel mass ratio, : volumetric efficiency, : displacement volume of engine cylinders, m3 : pressure of the air in the intake manifold, N/m2 : temperature of the air in the intake manifold, K : volume of the intake manifold, m3 : ideal gas constant, N∙m/kg∙K : proportional constant, : air mass in the intake manifold, kg : rate of change of air mass in the intake manifold, kg/s : throttle air mass flow, kg/s : air mass in the intake manifold in the Laplace domain, : instantaneous sucked-air mass into the intake manifold through a throttle plate in the Laplace
xegr m· egr m· fresh
Tfric iISG TISG Tdyno Je JISG Jdyno Jeq
domain, : instantaneous sucked-air mass from the intake manifold into cylinders in the Laplace domain, : EGR rate, : mass flow rate of air into the intake manifold through EGR passage, kg/s : mass flow rate of fresh air from the intake manifold into cylinders, kg/s : engine friction torque, N∙m : gear ratio of the ISG motor, :
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