Mitsubishi Outlander (2013+). Manual - part 165

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-12

When the driving wheels slip on the slippery road
surface, TCL applies the brake automatically, sends
the signal requesting engine speed reduction to the
engine-ECU, and prevents the loss of the driving
force resulting from the slippage of the driving wheel.

Hill START ASSIST (HSA) FUNCTION

System configuration

When the vehicle has completely stopped on a steep
uphill by the service brake, ASC-ECU judges
whether or not start the HSA function control in
accordance with the signals (ETACS-ECU,
CVT-ECU, G & yaw rate sensor, brake fluid pressure
sensor, engine-ECU, wheel speed sensor).

ACB06022

gear position information

CVT-ECU

Parking brake switch

ETACS-ECU

engine related information

Engine-ECU

: Hardwire-line
: CAN line
: Brake-line

Wheel speed sensor

Combination meter

Hydraulic unit

ASC-ECU

Master cylinder
pressure sensor

G and yaw rate
sensor

HSA control

Brake fluid
currently
supplied to each
wheel cylinder
is controlled.

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-13

HSA function state transition diagram (Overview)

NOTE:

•

ASC-ECU judges the inclination angle of the slope according to the G and yaw rate sensor output.

•

When either of the following conditions is satisfied, the mode is shifted to the forcible termination mode,
and HSA function control is terminated.

•

The parking brake operation is detected.

•

The shift lever operation to the shift or selector position other than the uphill direction driving is

detected (Forward uphill driving: shift or selector position other than "D"

, Reverse uphill driving: shift

or selector position other than "R").

•

The accelerator pedal and brake pedal are depressed at the same time.

•

The wheel speed sensor pulse is generated (When the vehicle moved)

•

The engine is stopped by engine stall, etc.

*:When uphill driving, if shift position is "N" position, HSA function is operated

HSA function control activated

ASC-ECU judges that the HSA operation condition is
satisfied. When the driver releases the brake pedal,
ASC-ECU maintains the brake wheel cylinder pres-
sure and waits.

FLUID PRESSURE HOLD MODE

By closing the cut valve, ASC-ECU maintains the
brake wheel cylinder pressure of the time when the
brake pedal is depressed, to prevent the vehicle from
moving backward.

AC809431

Fluid pressure
hold mode

When the conditions above are met

Forcible termination
mode

- Steep uphill

- The accelerator pedal is not depressed

Release of depressed brake pedal

The fluid pressure hold mode is kept for
approx. two seconds

Start mode

The accelerator pedal
is depressed

HSA function
control activated

HSA function control
not activated

The start mode is continued for
approx. 1.5 seconds

Depressurization is
complete

- The vehicle has been stopped by depressing the brake during uphill driving

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-14

START MODE

ASC-ECU releases the brake wheel cylinder pres-
sure maintained by the cut valve, depending on the
engine torque generated by depressing the accelera-
tor pedal.

FORCIBLE TERMINATION MODE

ASC-ECU immediately releases the brake wheel cyl-
inder pressure maintained by the cut valve and termi-
nates HSA function control.

BRAKE ASSIST (BA) CONTROL

Operation description

• If an emergency brake is determined by the brake

pedal depression speed and force, the brake
assist works to increase the braking force the
drivers produce. [The braking force is not
increased more than the brake performance (the
friction force between the road surface and the
tyres) .]

• The brake assist is completed when the brake

pedal is released or the vehicle is stopped.

fail-safe function

The brake assist mechanism does not work when the
ABS warning lamp illuminates.

Brake assist operation

AC903511AC

Brake pedal
depression force

Braking force

Emergency brake (determined)

Elapsed time

With brake assist

Without brake assist

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-15

ESS FUNCTION

ESS SYSTEM CONFIGURATION

The ASC-ECU judges whether the brake is applied
suddenly or not according to the stop lamp switch
"ON" signal sent from the stop lamp switch and the
frequency signal in proportion to the rotation speed
of each wheel sent from the wheel speed sensors. If
the ASC-ECU judges that the brake is applied sud-
denly, it sends the ESS activation request signal to
the ETACS-ECU. When the ETACS-ECU receives
the ESS activation request signal, it makes the
turn-signal lamps flash quickly.

Emergency stop signal operating
condition

It operates when the following conditions are met.

• The vehicle speed is 55 km/h or more.

• The brake pedal is depressed, and the system

judges that the brake is applied suddenly accord-
ing to the deceleration of the vehicle and the ABS
operation status.

Emergency stop signal operation stop
condition

The operation will be stopped under one of the fol-
lowing conditions.

• The brake pedal is released.

• The hazard warning lamps are flashing by the

hazard warning lamp switch operation.

• The system judges that the brake is not applied

suddenly according to the deceleration of the
vehicle and the ABS operation status.

AC809173

Wheel speed sensor

ASC-ECU

ETACS-ECU

Combination meter

Vehicle speed

The ESS operation
demand from ASC-ECU

The demand of the
turn-signal lamp blink
control by hazard warning
lamp switch operation

The demand of the
turn-signal lamp blink
control by turn-signal lamp
switch operation

Blink control
of turn signal
lamp

ESS
operation
judging

Vehicle deceleration

The judgment of a brake operation

ABS operation

The lighting state of hazard warning lamp by
operation of hazard warning lamp switch

Processing with a filter

Hazard warning lamp
switch

Turn-signal lamp switch

Stop lamp switch

Turn-signal indicator

Front turn-signal lamp,
Side turn-signal lamp,
Rear turn- signal lamp,

CAN-C-Mid line

CAN-C line

G and yaw rate sensor
(longitudinal G)

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