Revas-Inast Public Results

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Steven Perry
9 years ago
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1 Revas-Inast Public Results Project Set-up Vehicle dynamics server: state estimator Picture from Triphase Rapid prototyping software platform Active safety demonstrator Innovative sensors With support of Active suspension

Rapid prototyping software platform Active safety

2 Targets Decrease vehicle movement to increase comfort and safety Safety should be maintained when active suspension system fails Balance between function/performance and energy consumption developed in a short time Simulation with system targets to generate force-velocity couples Current situation (e.g. primary ride on road ISO 868 Class D) Defined heave, pitch and roll targets for primary ride Also targets defined for secondary and NVH

3 Safety Integrity and criterion Drivers can/ cannot cope Vehicle no longer controllable System reaction dangerous System reaction disturbing System reaction noticeable 1 Nothing noticed Source: IZVW / Audi AG Safety criterion NOT SAFE SAFE Architecture Electrical and software architecture Hydraulic analyses (e.g. slalom manouver) +

Nothing noticed 9 8 7 6 5 4 3 2 1 Source: IZVW / Audi AG Safety criterion NOT SAFE SAFE

4 Safety functions in software architecture Error Handler Error co code ode xx Sky-Hook Signal out of range accelerometers Signal out of Signal Si S irange gnal gn al Input IInp npu ut u displacement sensors Gradient monitoring body Gradient monitoring rattle accelerations velocities Signal Sign Si gnal gn g n na al al State Sta St atte a Gradient rattleestimator Validation V Vali Va alilid damonitoring dati da tion ti o on Estim Es ma ato tor Instability monitoring Cont Co ntro trollllller err e Controller displacements Valve current limits Signal Sign Si gnal gn g all Ouput Oupu Ou p power t Valve monitoring RPT power stage errors/warnings Offsets monitoring Vehicle CAN interrupted Private CAN interrupted Safety function CAN signal quality checks RPT input module errors Balancing function/performance and consumption Power supply required to drive with active suspension on defined road profiles + Energy flow Energy efficient actuator Optimization performed by Need for SW integrated energy management

damonitoring dati da tion ti o on Estim Es ma ato tor Instability monitoring Cont Co ntro trollllller err e Controller displacements Valve current limits Signal Sign Si gnal gn g all Ouput Oupu Ou p

5 Key Components a. The hydraulic actuator in the suspension Safety is maintained when system fails. = Key Components b. The hydraulic power pack determination =

6 UC needed current load pumps alternator current 1 2 time (s) 3 4 Current load pumps & alternator current with ultra cap box - 5l/min - Road ISO 868 Class C Pumps current load 1 l/min - Road ISO 868 Class B 12 1 current (A) Current load pumps & alternator current without ultra cap box - 5l/min - Road ISO 868 Class C With integrated energy management with UC 2 without UC current (A) current (A) Key Components c. Ultracap limits effect on power supply Alternator can deliver pump power current load pumps Energy management needed alternator current 4 5 time (s) time (s) Key Components d. The state estimator Estimation of wheel forces via wheel displacements and accellero s Derivation of modal velocities as input for sky hook control Reduction of needed sensors Actual force estimation needed for safety y reasons

UC current (A) current (A) Key Components c.

7 Integration test Implementation & Testing System test Successful outdoor road test on rough road Implementation & Testing Current situation New Vehicle behavior OK! Normal suspension Active suspension in same vehicle type and same road section

Testing Current situation New Vehicle behavior OK!

8 Future concept of high voltage architecture for full active suspension For (H)EV Simultaneous estimated current consumption by dynamic high power 12V-users ESP 7 A EPS 11 A Torque vectoring 3 A Active front steering/dynamic steering 5 A Full active suspension 1-7 A Sum A 3-4V E M EP S E- AB C DC/DC shift Proposed architecture. 14V High currents means big power loss Local power solution needed for each system like DC/DC or super caps, which enlarges individual system costs Use of high voltage bus for high power (chassis) applications to lower the currents and package

M EP S E- AB C DC/DC shift Proposed architecture.

M.S Ramaiah School of Advanced Studies - Bangalore. On completion of this session, the delegate will understand and be able to appriciate:

M.S Ramaiah School of Advanced Studies - Bangalore. On completion of this session, the delegate will understand and be able to appriciate: Transmission Control Lecture delivered by: Prof. Ashok C.Meti MSRSAS-Bangalore 1 Session Objectives On completion of this session, the delegate will understand and be able to appriciate: Rl Role of electronic