ACTIVATING COMPONENTS

ACTIVATING COMPONENTS Volvo S80 II рестайлинг

Active components connected to the Suspension module (SUM) can be activated in the diagnostic tool for function checks, in connection with fault-tracing or replacement.

If necessary, new software can be downloaded into the suspension module (SUM). When ordering software, the hardware and the software in the vehicle is compared to the information in the Volvo central database.

If the comparison between the vehicle and Volvo central database does not correspond, the database is updated with the vehicle configuration. When this is complete the software can be downloaded.

After new software has been downloaded, the control module must be calibrated according to the diagnostic tool's vehicle communication.

Scheme 94

Scheme 94: CONTINUOUSLY CONTROLLED CHASSIS CONCEPT (FOUR-C)

Four-C is a system that individually regulates damping in the shock absorbers whilst driving. The Suspension module (SUM) controls the functions for Four-C.

By regulating the damping in the shock absorbers the compromise between ride comfort, road grip and steering characteristics becomes considerably better than with traditional shock absorbers.

Suspension module (SUM) (4/84) receives signals from the height sensor (7/118-121) and acceleration sensor (7/87-89). Using information about the vehicles movements, together with information from other control modules the Suspension module (SUM) can adjust the shock absorber damping in relation to the driving conditions and driving mode.

The Suspension module (SUM) constantly assesses the driving style by monitoring the brake pressure and steering wheel angle. The information that the Suspension module (SUM) receives via the CAN network consists of

the driver's requested torque from the Engine control module (ECM) (4/46)
brake pressure from the Brake control module (BCM) (4/16)
vehicle speed from the Brake control module (BCM)
steering wheel angle from the Steering wheel angle sensor module (SAS) (3/130).

Comfort can be prioritized when driving straight ahead. When cornering, damping is increased to minimize roll and give the vehicle a more sporty feel. If there is sudden under- or oversteer, the damping is reduced to optimize grip. Grip is always the priority of the system, even during heavy braking or when the ABS system engages.

When driving on uneven surfaces, for example, on dirt roads, the system works to ensure that the pressure of the wheels on the road surface is as even as possible to maintain contact with the road in all situations.

The damping forces are controlled individually for all four wheels and are updated 500 times per second.

Information about the body's height position rear is sent from Suspension module (SUM) to Headlamp Control Module (HCM) (4/118) via CAN-net (Applies up to and incl. structure week 201119). From structure week 201120 this information is sent to Central electronic module (CEM) (4/56). The information is also used by receiving control module to calculate current angle for the headlights' light beam length adjustment.

The intensity of the lighting in the switches is partially controlled manually and partially controlled automatically by the twilight sensor. Manual control occurs together with lighting in other instrumentation. The signal is transmitted from the light switch module (LSM) (3/111) to the suspension module (SUM) via the control area network (CAN), and then on to the switch via a directly connected cable.

Automatic control occurs via the twilight sensor on the Climate control module (CCM). The signal is transmitted from the climate control module (CCM) (4/6) to the suspension module (SUM) via the control area network (CAN) and then on to the switch via a directly connected cable

If the Four-C function is not working, the shock absorbers act like standard passive shock absorbers. In the event of a fault in the system, a text message is displayed in the driver information module (DIM) indicating that a service is required.

The Suspension module informs the Central electronic module , via the CAN network, that it is active.

The Four-C function is not active when the vehicle is stationary. The function is activated automatically when the vehicle reaches a certain speed.

Scheme 95

Scheme 95: CHANGING THE DRIVING MODE

There are three different driving modes to choose from; and . The driving mode is selected using the switch on the dashboard and the selected driving mode is indicated by an LED. The switch (3/225) is directly connected to the Suspension module (SUM) (4/84).

The last selected driving mode is stored in the control module so that it is active in the next operating cycle.

Scheme 96

Scheme 96: CONTROL MODULE

The task of the suspension module (SUM) is to manage the functions for Four-C (Continuously Controlled Chassis Concept). Four-C is a system that continuously controls damping in the shock absorbers to affect the behavior and comfort of the vehicle. The suspension module (SUM)is located on the base plate under the rear seat backrest.

The control module continually receives signals from different sensors to calculate the vehicle's position and movements. By individually controlling damping in the shock absorbers, the system works to achieve the best possible comfort and road grip.

The suspension module (SUM) reads off and controls directly connected components and sensors. The system also communicates with other control modules and components via CAN communication.

The suspension module (SUM) has integrated self diagnostics that check input and output signals to detect damaged components and wiring. If the control module detects a fault, the current diagnostic trouble code (DTC) is stored at the same time as the control module continues the system in fail-safe mode. In this case, the shock absorbers function as normal passive shock absorbers. When a fault is detected an error message is also transmitted to the Driver information module (DIM) to warn the driver.

Diagnostic trouble codes (DTCs) that are stored in the control module's memory can be read off using the diagnostic tool.

An easy way to check whether the suspension module (SUM) is powered is to change driving mode via the switch and check that it changes. See CHANGING THE DRIVING MODE . If the driving mode does not change, this could mean that the control module has disengaged the switch, which can occur if there is a fault in the switch.

If the voltage falls below 9 V or exceeds 16.0 V, the system continues in fail-safe mode.

The table below summarizes the input signals to and output signals from the suspension module (SUM). The signals are divided into directly connected signals and CAN communication. The illustration below displays the same information with the Volvo component designations