Investigation of Control System Strategies for Hydraulic Valve Actuation in an IC Engine

Adil Karakayis

Supervisor: Dr Steven Begg

Context

• Existing systems

• Objectives

• Test rig structure

- Actual hydraulic system

- Simulation model

- Signal generation system

- Data logging system

• Experimental results

• Future work

Existing Systems

• VVTL-i (Variable Timing and Lifting Intelligent)

• i-VTEC (Intelligent Variable Valve Timing and Electronic Lift Control)

• IVLC (Intake Valve Lift Control)

• VVEL (Variable Valve Event and Lift)

• MAEHV (Multi-Air Electro Hydraulic Valve Timing)

• VarioCam Plus

• Camtronic

• Valvetronic

• Valvematic

Valve Lift Profiles Mechanical Valve Actuation • Possible to do cam phasing

• Possible to change valve lifting

• Restriction of camshaft cam lobe profile

Hydraulic Valve Actuation • Fully flexible

• Freedom of each valve

• Possible to try advance engine strategies

Camshaft Valve Lift Profile Optimized Valve Lift Profile

Reference:<https://docs.google.com/file/d/0BzhpsbuelzqYU01WWlc1dkFxbm8/edit?pli=1> [Accessed on 21 July 2014]

Test Rig Structure

• [1] HVA assemebly

• [2] Moog servovalve

• [3] LVDT sensor

• [4] Pressure transducers

• [5] Primmary and secondary oil tanks

• [6] Hydraproducts hydraulic pump system

• [7] Parker Oaler Accumulator

• [8] Parker high pressure oilf filter

Equipment • [9] Pressure switch

• [10] Pressure gauge

• [11] High pressure flexible hoses

• [12] Protective glass

Test Rig Structure

MATLAB/Simulink Model

• SimHydraulics

- Fixed displacement hydraulic pump

- Accumulator

- 4-way directional valve

- Double-acting hydraulic cylinder

Components of Simulink model

• PID controller

• SimMechanics

- Hydraulic actuator rod

- Poppet valve

Experimental Results

• Camshaft Valve Lift Profile • Optimized Valve Lift Profile

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0

2

4

6

8

10

12

0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045

Cu

rren

t (A

)

Lif

t (m

m)

- E

ng

ine

Sp

eed

(x1

00

0rp

m)

Time (s)

Valve Lift vs Signal (800rpm at 70bar)

Desired Lift (mm) Simulation Lift (mm) LVDT(mm) Current Monitoring (A)

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0

2

4

6

8

10

12

0.06 0.065 0.07 0.075 0.08 0.085 0.09

Cu

rren

t (A

)

Lif

t (m

m)

Time (s)

Valve Lift vs Signal (1000rpm at 70bar)

LVDT(mm) Simulation Lift (mm) Desired Lift (mm) Current Monitoring (A)

Future Work

• Simulation model can be improved.

• Signal generation system can be improved.

• Feedback control system can be added into the system in addition to feed-forward control system.

Experiment Video

Thank you for your attention Any Question?