Driving dynamics and hybrid combined in the torque vectoring
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1 Driving dynamics and hybrid combined in the torque vectoring Concepts of axle differentials with hybrid functionality and active torque distribution Vehicle Dynamics Expo 2009 Open Technology Forum Dr. Rüdiger Freimann Dr. Thieß-Magnus Wolter Erik Schneider Stuttgart, June 17th, 2009 Excellence in Automotive Research & Design
2 Overview Driving dynamics and hybrid combined in the torque vectoring Initiation Motivation Torque Vectoring and driving dynamics Simulation approach 2 Examples of Hybridization with active torque distribution Design Functionality Evaluation results for longitudinal and lateral dynamics Layout and optimization of longitudinal dynamics Layout and optimization of lateral dynamics Summary Photocase 2
3 Overview Driving dynamics and hybrid combined in the torque vectoring Initiation Motivation Torque Vectoring and driving dynamics Simulation approach 2 Examples of Hybridization with active torque distribution Design Functionality Evaluation results for longitudinal and lateral dynamics Layout and optimization of longitudinal dynamics Layout and optimization of lateral dynamics Summary Photocase 3
4 Motivation Driving dynamics and hybrid combined in the torque vectoring Active manipulation of lateral dynamics Torque Vectoring System Active manipulation of longitudinal dynamics Traction advancement Advancement of acceleration behavior Hybrid function Energy recovery and boost function Ease integration Moderate changes in driveline design and package Preservation of engine and driveline configurations Modularity and ability to retrofit Photocase 4
5 Positioning possibilities Integration of electrical machines in the powertrain At the Internal Combustion Engine Quelle:vgl. VDI-Berichte Nr. 1943,
6 Positioning possibilities Integration of electrical machines in the powertrain At Between the Internal Engine Combustion and transmisson Engine (inline or parallel) Quelle:vgl. VDI-Berichte Nr. 1943,
7 Positioning possibilities Integration of electrical machines in the powertrain At Between the Internal Engine within Combustion gearbox and transmisson Engine (inline or parallel) Quelle:vgl. VDI-Berichte Nr. 1943,
8 Positioning possibilities Integration of electrical machines in the powertrain At Between the Positioning Internal Engine within Combustion at gearbox and transfer transmisson case Engine (inline or parallel) Quelle:vgl. VDI-Berichte Nr. 1943,
9 Positioning possibilities Integration of electrical machines in the powertrain At Between the Positioning Internal Engine within Combustion at gearbox at and transfer axle transmisson shafts case Engine (to (inline FA and/or parallel) RA) Quelle:vgl. VDI-Berichte Nr. 1943,
10 Positioning possibilities Integration of electrical machines in the powertrain At Between the Positioning Internal As Engine within Wheel Combustion at gearbox at Integration and transfer axle transmisson shafts case Engine (4x2 (to (inline FA or 4x4 and/or parallel) possible) RA) Quelle:vgl. VDI-Berichte Nr. 1943,
11 Possible positions at the differential Integration of electrical machines in the powertrain 1 electrical machine 2 electrical machines 3 electrical machines Axle Torque Support Wheel Individual Torque distribution possible 11
12 Axle differential with active torque distribution Torque-Vectoring M Rad Understeering driving behavior without active torque distribution Positive effect on Active longitudinal and lateral torque distribution Traction Critical cornering speed Self-steering response Handling and cornering characteristics Agility Yaw damping / yaw boosting Reducing brake intervention 12
13 Basic Optimization Targets System Definition Longitudinal Dynamics Optimal E-Machine Concept related to driving Cycle and performance targets Optimal Battery Capacity related to driving Cycle Optimal Hybrid Strategy related to driving Cycle Lateral Dynamics and Driving safety Optimal E-Machine Concept and set-up for dynamic Torque Vectoring Targets for mass distribution and self steer characteristics Limitations to hybrid strategy under lateral dynamics Necessary sub-controls for ASR/MSR and ESC Intervention Pixelio Networked Simulation approach for Optimization and pre evaluation through virtual test runs 13
14 Simulation environment Networked simulation Use of EXITE-ACE as co-simulation tool to connect IAV-powertrain model VeLoDyn and common handling simulation tool vedyna Powertrain model Integration tool Vehicle model vedyna detailed Powertrain model representing hybrid architecture and contains operational strategy detailed vehicle chassis model detailed environmental description including a maneuver controller for longitudinal/lateral maneuver setup 14
15 Overview Driving dynamics and hybrid combined in the torque vectoring Initiation Motivation Torque Vectoring and driving dynamics Simulation approach 2 Examples of Hybridization with active torque distribution Design Functionality Evaluation results for longitudinal and lateral dynamics Layout and optimization of longitudinal dynamics Layout and optimization of lateral dynamics Summary Photocase 15
16 #1 Example, roughly equiv. to Lexus RX400h Integration of electrical machines in the powertrain Starter/Generator at ICE, Additional E- Machine at Rear Axle (Only virtual / SW 4WD clutch) electrical Torque Vectoring - + opt. Bat. Also possible with Rear Axle Drive and E-machine at front axle Quelle:vgl. VDI-Berichte Nr. 1943,
17 Potential Hybrid strategy (w/ Rear Axle E-Machine) Integration of electrical machines in the powertrain Battery charging during normal driving Basic Recuperation (engine drag torque superposition) Brake recuperation (system blending). Virtual AWD Battery buffered AMT shift support (boost) Driving with E-machine only 4WD-strategy and rear axle boost Safety strategy for: Driving with E- machine in "Active Short Erroneous Torque set-point / sign Slip intervention (ASR/MSR) ESC and ABS intervention (e. g. under coupled inertia) 17
18 Simulation settings 3d-Alpe d Huez simulation XYZ XYZ XYZ XYZ XYZ XYZ Vehicle parameterization Advanced driver settings and road conditions 3D-Two-Lane Alpe d Huez road profile Front and rear E-Machine scaled from longitudinal optimization Driver used form vedyna expect gear shifting All hybrid functions enabled SOC at start: 70 % 4WD torque split strategy: ASR on 1. As much as possible with front axle, then add rear axle 2. Permanent 4WD suport SOC dependent MSR on/off Implementation of a ASR/MSR controller by IAV 18
19 Vehicle behaviour while regen. braking on Alpe d Huez 3d-Alpe d Huez simulation 160 seconds on the road MSR/ESC off Up-hill drive with max. of 800Nm recuperation torque at rear axle 19
20 Vehicle behavior while regen. braking on Alpe d Huez Example for over braking on rear axle while regenerative braking up-hill. 20
21 Integration of electric machines in the powertrain #2 Rear Axle differential with active torque distribution Integration of two electric machines in the differential casing Control Open differential Energy storage Compact electric machines Optional for hybrid capability Wheel-specific torque vectoring Existing engine/transmission configurations (MT, AMT, DCT, CVT, AT) can be carried over Rear-axle module: supplier add-on Using a suitable storage system Parallel hybrid Improved longitudinal dynamics Avoidance of traction interruption Utilization of wheel-specific coefficient of friction 21
22 Design of active differential Axle differential with active torque distribution Electric machine Seal Open differential carried over Flexibility and modularity Open differential Active differential... with hybrid function Basis for electric axle Capability of integrating gear ratio Flange, constant-velocity joint shaft Flange, drive shaft Rotor bearing High degree of integration for electric machine without gear ratio Existing mechanical structures and technologies carried over Low additional moments of inertia, utilization of existing package 22
23 Hybrid functionalities Axle differential with active torque distribution 4th gear, 85 km/h boosting 24 kw 24 kw E-machine mode E-machine mode 350 Nm 350 Nm 600 Nm +350 Nm i = Nm +350 Nm 1700 N 1700 N N N E-machine and generator torque: 2 x 350 Nm / 30 kw Hybrid functionalities Avoidance of traction interruption MT / AMT 300 Nm 23
24 Torque vectoring functionality Axle differential with active torque distribution Moving off with µ-split Generator mode E-machine mode 350 Nm 350 Nm 350 Nm 350 Nm i = Nm +700 Nm 1000 N 1000 N N µ low Mechanical torque transmission superimposed by electrical power flow when necessary 175 Nm +175 Nm TV torque of 700 Nm for optimizing traction influencing transverse dynamics independently of drive torque µ high 24
25 Traction potential in boosted mode Tractive -power chart Constant-speed driving without e-machines 25,0 Traction / running resistance [kn] Zugkraft / Fahrwiderstand [kn] 20,0 15,0 10,0 5,0 1st gear 2nd gear 3th gear 4th gear 5th gear 6th gear 0, Velocity [km/h] Geschwindigkeit [km/h] Road load 25
26 Traction potential in boosted mode Tractive -power chart Constant-speed driving without boosted by e-machines (2 x 350 Nm) 25,0 Traction / running resistance [kn] Zugkraft / Fahrwiderstand [kn] 20,0 15,0 10,0 5,0 1st gear 2nd gear 3th gear 4th gear 5th gear 6th gear 0, Velocity [km/h] Geschwindigkeit [km/h] Road load 26
27 Traction potential in boosted mode Tractive -power chart Constant-speed driving without boosted by e-machines (2 x 350 Nm) and transmission 25,0 Traction / running resistance [kn] Zugkraft / Fahrwiderstand [kn] 20,0 15,0 10,0 5,0 1st gear 2nd gear 3th gear 4th gear 5th gear 6th gear 0, Velocity [km/h] Geschwindigkeit [km/h] Road load 27
28 Traction potential in boosted mode Tractive -power chart Constant-speed driving only without boosted by e-machines (2 x (2350 x 350 Nm) Nm) and transmission ,0 Traction / running resistance [kn] Zugkraft Zugkraft / Fahrwiderstand Fahrwiderstand [kn] [kn] , , , ,0 1st gear 2nd gear 3th gear 4th gear 5th gear 6th gear Electric propulsion mode 0.0 0, Geschwindigkeit [km/h] Velocity [km/h] Road load 28
29 Traction potential in boosted mode Tractive -power chart Constant-speed driving without only boosted with by e-machines (2 (2 x 350 x 350 Nm) Nm) and and transmission ,0 Traction / running resistance [kn] Zugkraft Zugkraft / Fahrwiderstand Fahrwiderstand [kn] [kn] , , , ,0 1st gear 2nd gear 3th gear 4th gear 5th gear 6th gear Electric propulsion mode 0.0 0, Geschwindigkeit [km/h] Velocity [km/h] Road load 29
30 Overview Driving dynamics and hybrid combined in the torque vectoring Initiation Motivation Torque Vectoring and driving dynamics Simulation approach 2 Examples of Hybridization with active torque distribution Design Functionality Evaluation results for longitudinal and lateral dynamics Layout and optimization of longitudinal dynamics Layout and optimization of lateral dynamics Summary Photocase 30
31 Overview Driving dynamics and hybrid combined in the torque vectoring Initiation Motivation Torque Vectoring and driving dynamics Simulation approach 2 Examples of Hybridization with active torque distribution Design Functionality Evaluation results for longitudinal and lateral dynamics Layout and optimization of longitudinal dynamics Layout and optimization of lateral dynamics Summary Photocase 31
32 Consumption potential in the NEDC Simulations results of longitudinal dynamics Power component from electric machines in NEDC Power in [kw] t in [s] 30 Total power Electric Power 20 El. Drive Cutoff C Bat = 26 Ah 10 (v > v Limit ) 0-10 Cutoff (end of acceleration) Recuperation Example without electric propulsion mode t in [s] Full-load acceleration Acceleration from km/h Acceleration from km/h Acceleration from km/h Boosted versus conventional % % % Consumption in NEDC Potential Startstop - 4.1% Dependent on operating strategy -9.5% to % 32
33 Wheel-specific Torque-Vectoring Simulations results of lateral dynamics ISO 4138 Steer. angle w/o el. hyb. powertrain Steer. angle w/ el. hyb. powertrain Torque, left Torque, right lateral acceleration gain approx. 5% Steady-state skid-pad driving R = 100 m (test to ISO 4138) Self-steering response impact E-machine torque levels Steering angle linearization gain approx. 30% area of optimizing control 2 x 230Nm 2 x 350 Nm predictable driving behavior also on upper lateral acceleration increase the speed of cornering possibility to recuperate transversal dynamics energy possibility to realize a lane keeping system Lateral acceleration 33
34 Wheel-specific Torque-Vectoring Simulations results of lateral dynamics ISO 7401 E-machine torque levels Yaw rate peak response time reduced by approx. 30% Overshoot reduced from 13% to approx. 2% ½ steering angle area of optimizing control Steering angle Yaw rate w/o el. hyb. powertrain Yaw rate with el. hyb. powertrain Torque, left Torque, right Step steering-angle change from 0 to 50 (300 /s at 80 km/h, test to ISO 7401) Driving dynamics impact low response time by fast actuator speed (~10 ms) enhancement of steering response (yaw rate gain) reduction of undesired yaw rate response (yaw rate amortization) reduction of body motion Time 34
35 Wheel-specific Torque-Vectoring Simulations results of lateral dynamics FMVSS 126 E-machine torque levels Yaw rate Steering anglel Steering input Timet Yaw rate response Yaw deflection Yaw rate w/o el. hyb. powertrain Yaw rate w/ el. hyb. powertrain Torque, left Torque, right Transversal deflection Yaw rate vs. max..yaw rate Understeer criterion Oversteer criterion position w/o el. hyb. powertrain position with el. hyb. powertrain w/o el. hyb. powertrain with el. hyb. powertrain Sine with dwell for 6.5xA (test to FMVSS 126) Driving stability impact impact of tracking stability vehicle stabilization without braking increase of driving dynamics by pre controlled intervention Time Time 35
36 Torque-Vectoring and Hybrid Combined system layout optimisation Influence of additional torques for stabilizing potential Based on: FMVSS 126 at max. steering angle amplification Yaw rate deviation (abs.) Consumption potential from longitudinal dynamics 2 x 20kW 2 x 30kW Installed Total Torque in Nm Simulated Vehicle category: SUV, (not fully verified) 36
37 Driving Dynamics and Hybrid Combined in the Torque- Vectoring Initiation Motivation Torque Vectoring and driving dynamics Simulation approach 2 Examples of Hybridization with active torque distribution Design Functionality Evaluation results for longitudinal and lateral dynamics Layout and optimization of longitudinal dynamics Layout and optimization of lateral dynamics Summary Photocase 37
38 Summary Hybrid control with active torque distribution Positive effect on longitudinal and lateral dynamics Assist cornering behavior and vehicle stabilization Offer traction optimization, boost function and shift support at MT and AMT Parallel hybrid Electric machines provide the basis for hybridized powertrain Benefits of electric machines direct at the differential Use of existing engine/transmission configurations Integrative, flexible and modular solution Very short control response time to provide the demanded driving dynamics intervention Drawbacks Additional costs and weight related to standard TV Photocase Advanced control necessary 38
39 Thank you Dr. Rüdiger Freimann IAV GmbH Rockwellstrasse 16 D Gifhorn Germany Phone +49 (0) Excellence in Automotive Research & Design
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