scholarly journals Adaptive Engine Torque Compensation with Driveline Model

2018 ◽  
Vol 166 ◽  
pp. 04004
Author(s):  
Jinrak Park ◽  
Seibum Choi ◽  
Jiwon Oh
Keyword(s):  
Hybrid Vehicles ◽  
Friction Torque ◽  
Operating Conditions ◽  
Engine Torque ◽  
Powertrain Control ◽  
Starter Motor ◽  
Parallel Hybrid ◽  
Engine Wear ◽  
Adaptive Compensator ◽  
Engine Clutch

Engine net torque is the total torque generated by the engine side, and includes the fuel combustion torque, the friction torque, and additionally the starter motor torque in case of hybrid vehicles. The engine net torque is utilized to control powertrain items such as the engine itself, the transmission clutch, also the engine clutch, and it must be accurate for the precise powertrain control. However, this net torque can vary with the engine operating conditions like the engine wear, the changes of the atmospheric pressure and the friction torque. Thus, this paper proposes the adaptive engine net torque compensator using driveline model which can cope with the net torque change according to engine operating conditions. The adaptive compensator was applied on the parallel hybrid vehicle and investigated via MATLAB Simcape Driveline simulation.

scholarly journals Development of Engine Clutch Control for Parallel Hybrid Vehicles

2013 ◽  
Vol 6 (2) ◽  
pp. 283-287 ◽  
Author(s):  
Joonyoung Park
Keyword(s):  
Hybrid Vehicles ◽  
Parallel Hybrid ◽  
Engine Clutch ◽  
Clutch Control

Analytical Calibration of Map-Based Energy Managements of Parallel Hybrid Vehicles

2014 ◽  
Author(s):  
Thomas Juergen Boehme ◽  
Markus Schori ◽  
Heiko Rabba ◽  
Matthias Schultalbers
Keyword(s):  
Hybrid Vehicles ◽  
Parallel Hybrid ◽  
Analytical Calibration

Coordinating Control Oriented Research on Algorithm of Engine Torque Estimation for Parallel Hybrid Electric Powertrain System

2004 ◽  
Author(s):  
Tong Yi ◽  
Li Jianqiu ◽  
Zhang Junzhi ◽  
Yang Fuyuan ◽  
Zhang Kexun ◽  
...  
Keyword(s):  
Engine Torque ◽  
Powertrain System ◽  
Torque Estimation ◽  
Parallel Hybrid ◽  
Coordinating Control ◽  
Hybrid Electric ◽  
Hybrid Electric Powertrain ◽  
Oriented Research

Research on Dynamic Torque Control Strategy for Parallel Hybrid Electric Vehicle

2011 ◽  
Vol 228-229 ◽  
pp. 951-956 ◽  
Author(s):  
Yun Bing Yan ◽  
Fu Wu Yan ◽  
Chang Qing Du
Keyword(s):  
Electric Vehicle ◽  
Hybrid Electric Vehicle ◽  
Control Algorithm ◽  
Dynamic Control ◽  
Torque Control ◽  
Engine Torque ◽  
Parallel Hybrid Electric Vehicle ◽  
Torque Control Strategy ◽  
Parallel Hybrid ◽  
Hybrid Electric

It is necessary for Parallel Hybrid Electric Vehicle (PHEV) to distribute energy between engine and motor and to control state-switch during work. Aimed at keeping the total torque unchanging under state-switch, the dynamic torque control algorithm is put forward, which can be expressed as motor torque compensation for engine after torque pre-distribution, engine speed regulation and dynamic engine torque estimation. Taking Matlab as the platform, the vehicle control simulation model is built, based on which the fundamental control algorithm is verified by simulation testing. The results demonstrate that the dynamic control algorithm can effectively dampen torque fluctuations and ensures power transfer smoothly under various state-switches.

Optimal integrated energy management and shift control in parallel hybrid electric vehicles with dual-clutch transmission

2019 ◽  
Vol 234 (2-3) ◽  
pp. 599-609
Author(s):  
Guoqiang Li ◽  
Daniel Görges
Keyword(s):  
Fuel Consumption ◽  
Energy Management ◽  
Electric Vehicles ◽  
Hybrid Electric Vehicles ◽  
Weighting Factor ◽  
Engine Torque ◽  
Shift Control ◽  
Parallel Hybrid ◽  
Power Split ◽  
Hc Emissions

This paper addresses the integration of the energy management and the shift control in parallel hybrid electric vehicles with dual-clutch transmission to reduce the fuel consumption, decrease the pollutant emissions, and improve the driving comfort simultaneously. Dynamic programming with a varying weighting factor in the cost function is proposed to balance the shift frequency and the fuel consumption for the power-split control and gear schedule design. Simulation results present that the drivability can be improved with a varying weighting factor due to fewer shift events while the fuel consumption is only slightly increased compared to dynamic programming with a constant weighting factor. A shift-energy-management strategy integrating the upshift and power-split control based on a multi-objective optimization is presented where model predictive control is employed to ensure engine load rate constraints. The strategy can smoothen the engine torque through torque compensation from the electric motor to prevent engine transient emissions resulting from a sudden load change. In a simulation study, the NOx and HC emissions could be reduced by 1.4% and 2.6% with 2% increase of the overall fuel consumption for the Federal Test Procedure 75 by smoothening the engine torque. For the New European Driving Cycle, 0.9% and 1.1% reduction of NOx and HC emissions could be achieved with only 0.3% more fuel consumption.

scholarly journals A Control-Oriented Engine Torque Online Estimation Approach for Gasoline Engines Based on In-Cycle Crankshaft Speed Dynamics

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4683
Author(s):  
Qiang Tong ◽  
Hui Xie ◽  
Kang Song ◽  
Dong Zou
Keyword(s):  
Real Time ◽  
Engine Speed ◽  
Estimation Error ◽  
Control Unit ◽  
Friction Torque ◽  
Adaptive Observer ◽  
Load Torque ◽  
Engine Torque ◽  
Brake Torque ◽  
Torque Estimation

Engine brake torque is a key feedback variable for the optimal torque split control of an engine–motor hybrid powertrain system. Due to the limitations in available sensors, however, engine torque is difficult to measure directly. For torque estimation, the unknown external load torque and the overlap of the expansion stroke between cylinders introduce a great disturbance to engine speed dynamics. This makes the conventional cycle average engine speed-based estimation approach unusable. In this article, an in-cycle crankshaft speed-based indicated torque estimation approach is proposed for a four-cylinder engine. First, a unique crankshaft angle window is selected for load torque estimation without the influence of combustion torque. Then, an in-cycle angle-domain crankshaft speed dynamic model is developed for engine indicated torque estimation. To account for the effects of model inaccuracy and unknown external disturbances, a “total disturbance” term is introduced. The total disturbance is then estimated by an adaptive observer using the engine’s historical operating data. Finally, a real-time correction method for the friction torque is proposed in the fuel cut-off scenario. Combining the aforementioned torque estimators, the brake torque can be obtained. The proposed algorithm is implemented in an in-house developed multi-core engine control unit (ECU). Experimental validation results on an engine test bench show that the algorithm’s execution time is about 3.2 ms, and the estimation error of the brake torque is within 5%. Therefore, the proposed method is a promising way to accurately estimate engine torque in real-time.

Experimental Investigation of the Cylinder Block Movement in an Axial Piston Machine

2015 ◽  
Author(s):  
Stephan Wegner ◽  
Stefan Gels ◽  
Dal Sik Jang ◽  
Hubertus Murrenhoff
Keyword(s):  
Viscous Friction ◽  
Friction Torque ◽  
Operating Conditions ◽  
Valve Plate ◽  
Measuring System ◽  
Cylinder Block ◽  
Experimental Investigations ◽  
German Research Foundation ◽  
Block Movement ◽  
Axial Piston

The greatest share of hydromechanic and volumetric losses in axial piston machines are produced within the tribological interfaces piston / cylinder, cylinder block / valve plate and slipper / swash plate. Hydrostatic and hydrodynamic effects are used to minimise the sum of solid friction, viscous friction and throttle losses. Other tribological interfaces have minor influence on efficiency losses in most operating points in machines of this type. This paper focuses on experimental investigations with the objective to acquire further knowledge on the cylinder block / valve plate contact. The investigations are part of a project funded by the German Research Foundation in which experimental and simulative investigations are combined to identify the effects influencing this tribological interface. The experiments focus on the multi-directional movement of the cylinder block and the friction torque within the contact. Therefore a test rig was built, capable of measuring the cylinder block movement in all degrees of freedom and the friction torque between both parts. A sensor system is built around a standard rotary group of an axial piston pump with a spherical cylinder block / valve plate contact. The pump functionality is maintained and measurements under standard operating conditions up to 30 MPa are possible. Procedures of the design process and descriptions of the measuring system are presented, followed by results of the cylinder block movement measurement, comparing the behavior under different pressure levels and speeds.

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