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Hydraulic system of a car

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Capitolo 0. INTRODUCTION 3.1

Hydraulic system of a car

Valve

Limited Slip Differential Actuator

Insertion Actuators

Tank Power Unit

DC Motor

Accumulator

Pump

Clutch Actuator Geab-box Actuator

Tube Tube

Tube

Tube Valves

Selection

Valves Insertion

Clutch Valve

Filter

Selection Actuators

ωM

Va

Ia

Ql

Qs

Qi

R

R R

R

R

Ec

xc

Pd

Pd

Pc

Qc

Cc

xd

JM

JP

QP

Cc

Qc

Qc

Qv

Qa

Q P

Q1 P1

Qu

Qd

Qri

Qrc

Qrs

Qrd

Vl

Pl

Pl

Pl

Pl

Pl

bM, bP

V0

md

mc

bc, b bdc, bd

αP

Qα

Ei1,Ei2

Es1,Es2,Es3

Ed

The system which provides hydraulic power to a car is essentially composed by an electric motor, a gear hydraulic pump, an hydraulic accumulator and some electric valves controlling the power flowing toward the loads (clutch actuator, differential actuator, selection actuator, insertion actuator, etc.).

Zanasi Roberto - System Theory. A.A. 2015/2016

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Capitolo 3. DYNAMIC MODELING 3.2

Ia

Va

 -

1 Las+Ra

6

6

-  

EM

KM -KM-CM

- 

1 (JP+JM)s+bP+bM

?

?

ωM

 -

 

bcMsgnωM

6

6

- --KP-

QP

KP

CP

Qu

Qα

 

αr

?

?

- -



R

?

-

 -

6

1 s

6

 V0

6 6

K0 (V0Vl)γ

- 

Vl

Pl

Ql

DC Motor Pump Accumulator

Pl

Ql

- -

Ai

?

?

Qa

 

1−sgn(Ec) 2 1+sgn(Ec)

2



Qrc

Qv

1−sgn(Ec) 2 1+sgn(Ec)

2

 Pl

R - 

KvE2c√∆Pv

?

?

Qv

 -

 -

1 s Ct1

6

6

P

- 

- 

1 s Lt1

?

?

 -

 

Rt1

6

6

- -

Pv . . .

Qv . . . Other

Actuators

Clutch Valve Hydraulic Tube

∆Pv

Ec

6

 

Rt2

6

6

- -

. . . . . .

Clutch Hydraulic Tube

 -

1 Ccs

6

6

Pc

-  

Qc

Ac  -Ac -Fc

- 

1 mcs+b

?

?

˙xc

 -

 

bcsgn( ˙xc)

6

6

- -

 -

6

1 s

6

K(xc)

6

Fc

- 

xc

0

POG bock scheme of the following physical elements:

• Electric motor (inductance La, resistance Ra, torque constant KM, inertia JM and linear friction coefficient bM).

• Hydraulic pump (gain KP, liking and friction coefficients αr and bcM)

• Accumulatore idraulico (volume a vuoto V0, costante elastica del gas K0)

• Hydraulic circuit controlling the clutch: electric valve, hydraulic tube, hy- draulic capacitance Cc, mass mc, piston section Ac, piston friction bc, cup spring K(xc).

Zanasi Roberto - System Theory. A.A. 2015/2016

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