Computer Command Ride (CCR)

Fig. 1 Computer Command Ride (CCR) System.:

DESCRIPTION
The Computer Command Ride (CCR) control system, Fig. 1, controls the vehicle's ride firmness by controlling an actuator in each of the four struts to increase ride firmness as speed increases. On three damping mode systems the three modes are comfort, normal and sport. On two damping mode systems the modes are firm and comfort. Damping mode selection is controlled by the CCR controller according to vehicle speed conditions, vehicle accelerometer input and any error conditions which may exist.

On three-mode systems, the CCR controller located on a bracket under the driver's seat, controls and monitors the system. Using speed and accelerometer input signals the CCR determines the optimum mode strut valving. The controller monitors feedback signals from the struts to determine proper system operation. If the controller receives an incorrect feedback signal, a diagnostic trouble code is set in the controller and the fault indicator on the controller will light. The fault indicator will flash diagnostic trouble codes when the controller's diagnostic enable circuit is grounded.

On two-mode systems, the driver select switch determines the operating mode of the system. In the "Normal" switch position, the damping level depends on vehicle speed and accelerometer inputs. In the "Firm" switch position, the system will place the damping level in the firm mode regardless of vehicle speed and accelerometer inputs.

On all systems, each strut contains an electrical actuator that rotates a selector valve to a specific location commanded by the CCR controller. The selector valve contains different sized orifices which increase or decrease the strut's damping rate to control ride firmness.

The accelerometer/lateral acceleration switch is used for lift, dive or roll control. The switch will activate the sport mode on three damping mode systems or the firm mode on two damping mode systems when it detects any excessive lift, dive or roll. The system will then return to its speed dependent mode two seconds after the switch returns to its inactive state.