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International Journal of Automotive Technology > Volume 20(3); 2019 > Article
International Journal of Automotive Technology 2019;20(3): 619-627.
ENGINE NET TORQUE COMPENSATION THROUGH DRIVELINE TORQUE ESTIMATION IN A PARALLEL HYBRID VEHICLE
Jinrak Park1, Seibum Choi1, Jiwon Oh2, Jeongsoo Eo2
1KAIST
2Hyundai Motor Group
PDF Links Corresponding Author.  Seibum Choi , Email. sbchoi@kaist.ac.kr
ABSTRACT
In recent years, interest in smart and green vehicles has increased. There are many cases where engine net torque related control is performed when building smart and green car systems. Speed tracking control in autonomous driving, or optimal transmission shift control is an example. The engine net torque is the sum of the engine indicated torque, accessory load torque, and frictional torque, and the starter motor torque in the case of a parallel hybrid vehicle. However, the estimation error of these torque items can cause the estimation error of the engine net torque. In this paper, a compensation method for the slowly varying uncertainty of the engine net torque in a parallel hybrid vehicle using a multiplicative constant is proposed. The adaptation of the multiplicative constant is conducted using the amount of change in the engine net torque estimated in the backward direction of the driveline. The proposed algorithm is verified based on production vehicle data.
Key Words: Engine torque estimation, Engine net torque estimation, Engine torque compensation, Engine net torque compensation, Vehicle driveline model, Parallel hybrid vehicle
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