1 / 29

HW/SW Codesign of a Multiple Injections Driver for Engine Control Systems

This project aims to design a driver for fuel injection in engines with tight time constraints, focusing on direct injection engines with 2 to 4 cylinders. The system includes sensors for fuel temperature and pressure, requiring precise timing and fuel quantity control. Implementation constraints ensure integer computations and use of basic math instructions. The design involves behavioral modeling, decomposition, and system architecture, with a focus on detecting engine phases and managing injection angles. The project includes a detailed design flow using Esterel and C compilers for simulation and testing. Performance targets include low errors in RPM, stroke angle, and clock frequency.

henry-pittman
Télécharger la présentation

HW/SW Codesign of a Multiple Injections Driver for Engine Control Systems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. HW/SW codesign of a multiple-injections driver for engine control systems Alessandra Nardi Fan Mo Mentor : Alberto Ferrari

  2. OUTLINE • Problem definition • Driver specifications • Behavioral model • Functional simulation results

  3. PROBLEM DEFINITION - I • HW/SW Driver for fuel injection • Direct injection engine • 2 to 4 cylinders • One injector for every cylinder • independent • max 5 strokes for engine cycle • Tight time constraints

  4. INTAKE COMPRESSION EXPANSION EXHAUSTED 570° 320° CRANKSHAFT ANGLE 120° 440° PROBLEM DEFINITION - I Massimo Baleani, Alberto Ferrari

  5. PROBLEM DEFINITION - II 180 540 Engine phase  Engine angle Compression Intake Exhaust Explosion 0 360

  6. PROBLEM DEFINITION - III • Fuel sub-system • sensor for fuel temperature (FT) • sensor for fuel pressure (FP) • Engine angle • fly-wheel (FW) - every 6 • phase-wheel (PW)

  7. DRIVER INPUT/OUTPUT INPUTS • FW, PW, FT, FP • Stroke fuel quantities (Q1,…,Q5) • Stroke opening angles (T1,…,T5) • every TDC Exhaust PARAMETERS: Stroke angle ranges : (_o_k, _c_k) Minimum closure time : Tcmin

  8. DRIVER INPUT/OUTPUT OUTPUTS • Engine angle position (ALPHA90) - every 90 • Engine speed (SRPM90) - every 90 • DC events • Injector signal J • Fuel injected in the last cycle: F1, F2, F3, F4, F5

  9. DRIVER SPECIFICATIONS - I • Max 5 strokes for each cycle of each cylinder • k-th Injection Stroke (ISk) only in (_o_k, _c_k) • Guarantee : IS1 < IS2 < IS3 < IS4 < IS5 • Overlapped strokes: • injector closed for a minimum amount of time Tcmin

  10. DRIVER SPECIFICATIONS - II Tk  (_o_k, _c_k) ? • IF Tk < _o_k THEN _o_k = _o_k • IF Tk > _o_k THEN ISk not scheduled • IF Tk  (_o_k, _c_k) THEN _o_k = Tk

  11. DRIVER SPECIFICATIONS - III • In case of overlapped strokes: IS1 IS2 IS2 IS1 Minimum Closure Time

  12. IMPLEMENTATION CONSTRAINTS • Injection open angle resolution : +/- 0.2 • Injected fuel quantity precision : 0.1mg • if not cut • All computation must be integer • Only basic mathematical instructions (no sqrt) • Use IC/OC to implement timed functionality

  13. IMPLEMENTATION CONSTRAINTS Injection open angle resolution : +/- 0.2 • Constant speed model  =  ·t • Constant acceleration model  = 0 ·t + 1/2 · a  ·t2 • Error :  = 1/2 · a  ·( / 0 )2 • Example:  = 6 0 = 1,000 rpm a  = 10,000 rpm/s   = 0.03

  14. IMPLEMENTATION CONSTRAINTS • Injected fuel quantity resolution : +/- 0.1mg V = Q / D = 0.1mg/(0.76mg/mm3) = 0.131mm3  t = 13.1 s Example:  = 0.03  t =  / 0 0 = 1,000 rpm  t = 5s • Counter Precision 0 = 8,000 rpm  t = 125 s  Tclock = 0.5s 0 = 500 rpm  t = 2 ms  # ticks = 4000  # bits = 12

  15. FUNCTIONAL/ARCHITECTURE CODESIGN • Behavioral Model • Behavioral Decomposition #1 •  resources • Behavioral Decomposition #2 • resources optimization

  16. BEHAVIORAL DECOMPOSITION #1

  17. BEHAVIORAL DECOMPOSITION #2

  18. BEHAVIORAL DECOMPOSITION #2

  19. DRIVER SYSTEM

  20. ENGINE DETECTION Description of the modules: - FRC - DETECTOR - SAMPLE90

  21. CYLINDER DRIVER

  22. CYL_DRIVER/OPEN_INJECTION_ANGLES Tk  (_o_k, _c_k) ? • IF Tk < _o_k THEN _o_k = _o_k • IF Tk > _o_k THEN Isk not scheduled • IF Tk  (_o_k, _c_k) THEN _o_k = Tk

  23. CYL_DRIVER/TIMER_SYSTEM_MNG

  24. TIMER_SYSTEM_MNG/V_T_S_CONVERTER

  25. DESIGN FLOW ESTEREL COMPILER ESTEREL Description C COMPILER C SIMULATION Platform DESIGN MODULE PART Executable File TESTBENCH PART TESTBENCH Description OUTPUT DATA Record COMPARE

  26. SIMULATION RESULTS: RPM Speed [rpm] Time [s]

  27. SIMULATION RESULTS: INJECT PULSE Injector signal Time [s]

  28. SIMULATION RESULTS: INJECT PULSE Injector signal Angle [°]

  29. PERFORMANCE - RPM: error < 0.3rov/min - STROKE: no functional error, angle error < 0.08 degree - CLOCK FREQUENCY: 1MHz (with reference to Testbench provided by Alberto Ferrari)

More Related