tempomat, MONDEO, manuale
[ Pobierz całość w formacie PDF ]
Strona 1 z 3
Speed Control - Speed Control—Petrol - System Operation and
Component Description
Mondeo 2007.5 (02/2007-)
Print
Description and Operation
Control Diagram
Item
1
Description
Control switch units - Cruise control system
Refer to Component Description: Speed control switch(es).
Steering wheel module
Comments:
Contains the coil spring
GEM (generic electronic module)
Instrument cluster
Wheel speed sensor.
ABS (anti-lock brake system)
module
TCM (transmission control module)
Comments:
Vehicles with automatic transaxle.
PCM (powertrain control module)
Throttle body
Comments:
Contains the
TP (throttle position)
sensor
APP (accelerator pedal position)
sensor
CPP (clutch pedal position)
switches
Comments:
Vehicles with manual transaxle.
BPP (brake pedal position)
switches
Reverse gear solenoid
Comments:
Vehicles with manual transaxle.
2
3
4
5
6
7
8
9
10
11
12
13
System Operation
Speed Control
Cruise control is integrated into
PCM
and intervenes in engine management to automatically keep to the target speed selected by the driver. When the
system is active, the vehicle can be accelerated or decelerated without the accelerator pedal being pressed. The cruise control system is operated using the
control switch units on the steering wheel.
The
PCM
controls the throttle to achieve this. The
ABS
module supplies the VS signal for this.
On vehicles with automatic transmission, the
TCM
receives a notification via the
CAN (controller area network)
bus that the cruise control system is active.
The
TCM
then controls the transmission based on special engine maps.
The cruise control system recognizes three operating modes:
"OFF": The system is switched off.
"STANDBY": The system is switched on but is not currently controlling the speed of the vehicle.
"ACTIVE": The system is switched on and is adjusting the vehicle speed to match the speed set by the driver.
Every time the engine starts, the cruise control system is "OFF". In this mode, only the "ON" button is active.
The cruise control system is initially set to "STANDBY" mode when the "ON" button is pressed. The corresponding message appears in the instrument
2012-08-09
Strona 2 z 3
cluster. The speed control system is then in "STANDBY" mode. No speed has been saved.
The cruise control system can only be set to "STANDBY" mode under the following conditions:
Engine speed between idle speed and maximum permissible speed.
In "STANDBY" mode, only the "OFF", "SET+" and "SET-" buttons are active.
Pressing the "OFF" button switches the cruise control system back off again.
The cruise control system can only be changed into "ACTIVE" mode under the following conditions:
2nd - 6th gear engaged.
Engine speed between idle speed and maximum permissible speed.
Vehicle speed at least 30 km/h.
Pressing the "SET+" or "SET-" button activates the cruise control system. The system is in "ACTIVE" mode. The current speed is saved. The saved speed is
displayed in the instrument cluster. The corresponding message appears in the instrument cluster. The green "Cruise control" indicator lamp in the
instrument cluster lights up.
In "ACTIVE" mode the "OFF", "SET+", "SET-" and "CAN" buttons are active.
Pressing the "OFF" button switches off the cruise control system.
Tapping the "SET+" button (for less than 640 ms) increases the target speed by 1 km/h at a time. Holding down the "SET+" button (for longer than 640
ms) increases the target speed until the button is released. If the button is not released, the cruise control system accelerates the vehicle up to the
maximum permissible speed for cruise control (200 km/h) or up to the vehicle's maximum speed (whichever speed is lower). Tapping the "SET-" button
(for less than 640 ms) reduces the target speed by 1 km/h at a time. Holding down the "SET-" button (for longer than 640 ms) reduces the target speed
until the button is released. If the "SET-" button is held down until the minimum speed of 30 km/h is reached, the cruise control system switches to
STANDBY mode.
Pressing the "CAN" button sets the cruise control system to "STANDBY" mode. The last speed saved is then displayed in brackets on the instrument panel.
The saved speed can be re-activated by pressing the "RES" button. The speed is displayed in the instrument cluster without brackets. If the "SET+" or
"SET-" button is pressed while the "RES" function is being carried out (reactivation of saved speed), the cruise control system saves the current speed as
the target speed.
The cruise control system goes into STANDBY mode in the following situations:
Operation of the brake pedal
Operation of the clutch pedal
Handbrake operation
If the driver operates the accelerator pedal and the saved speed is subsequently exceeded for more than 5 minutes.
Pressing a speed control button for more than 2 minutes
Intervention by the traction control or electronic stability program (for longer than 40 ms)
Shifting of the gear selector lever to the "N" position (vehicles with automatic transmission only)
Speed falls below 30 km/h.
Occurrence of particular
DTC (diagnostic trouble code)
If the accelerator pedal is operated, the speed increases. As soon as the pedal is released, the speed falls to the saved value.
The following components supply signals which are required to operate the cruise control system:
Accelerator pedal position (APP) sensor
The
APP
sensor identifies the current position of the accelerator pedal and sends a
PWM (pulse width modulation)
signal to the
PCM
and an analog
DC
(direct current)
signal to the
GEM
.
If one or both of the
APP
sensors fails, a fault is stored in the
PCM
fault memory and the cruise control system cannot be activated.
Brake pedal position (BPP) switch
The
BPP
switch tells the
PCM
whether the vehicle is being braked. In its rest state the switch is closed and sends an earth signal to the
GEM
. This signal is
sent via the
CAN
to the
PCM
.
The brake light switch is likewise connected to the
GEM
and is opened in the rest state. When the vehicle is braked, the brake light switch sends a signal
to the
GEM
. This compares the signals from the
BPP
switch and the brake light switch. If a deviation occurs, a fault is stored in the
GEM
fault memory and
the cruise control system cannot be activated.
Clutch pedal position (CPP) switch
The
CPP
switch sends a ground signal to the
GEM
as soon as the clutch is operated. This signal is passed on by the
GEM
via the
CAN
bus to the
PCM
. This
then supplies the signal to the cruise control system.
If the
CPP
switch is incorrectly installed or set, the cruise control system cannot be activated.
Wheel speed sensors
The wheel speed sensors record the speed of the wheels. The recorded speed is sent to the
ABS
module via a hard-wired connection. The
ABS
module
calculates a vehicle speed signal (VS signal) from the speed and the wheel diameter. This VS signal is then transferred via the
CAN
bus to the
PCM
and
supplied to the cruise control system. If the VS signal is faulty, the cruise control system cannot be activated.
Parking brake switch.
The parking brake switch is hard-wired to the
GEM
. The parking brake switch sends a signal to the
GEM
when the parking brake is operated. The
GEM
activates the parking brake indicator lamp in the instrument cluster. If the parking brake indicator lamp is lit, the cruise control system cannot be activated.
Reversing lamp switch
The reversing lamp switch is hard-wired to the
GEM
. The reversing lamp switch sends a signal to the
GEM
when reverse gear is engaged. The
GEM
activates the reversing lamp. The cruise control system cannot be activated when reverse gear is engaged.
-
-
-
-
-
-
-
-
-
Component Description
Speed control switch(es).
Item
1
2
3
4
5
Description
Speed control system ACTIVE/STANDBY (ON)
Cancel cruise control (CAN)
Cruise control system OFF
Acceleration (set +)
Reactivate (RES)
2012-08-09
Strona 3 z 3
Deceleration (set –)
The cruise control system buttons are non-locking push buttons. They are connected to the coil spring via a hard-wired 16-pin plug connection.
The cruise control system buttons are based on the resistance bridge circuit principle. The cruise control system buttons deliver a variable resistance signal
voltage to the steering wheel module. The cruise control system buttons receive a 5 Volt reference voltage. The steering module measures the feedback
voltage to determine which button has been pressed.
A simple resistance measurement across pins 15 and 16 (right cruise control system button) or pins 15 and 8 (left cruise control system button) at the 16-
pin coil spring connection enables the function of the cruise control system buttons to be monitored. A change of resistance must occur when a button is
pressed.
6
2012-08-09
[ Pobierz całość w formacie PDF ]