The Pre-Collision System (PCS) with Dynamic Radar Cruise Control is offered as Special Order equipment on the IS F. PCS uses a high-frequency millimeter-wave radar sensor in the front radiator grille to recognize a vehicle or obstacle in the radar detection area in front of the IS F. If an object is present within range of the millimeter wave sensor, the radar detects the distance to the object, the relative speed and the course based on the reflected waves. The PCS Electronic Control Unit (ECU) uses this data to determine whether a collision is imminent
and unavoidable.
PCS consists of three operations: pre-collision (when an unavoidable collision is determined); front or rear wheel skid tendency; and sudden braking. In pre-collision or sudden braking operation, the Skid Control ECU switches Brake Assist (BA) to the standby mode, determines the front or rear wheel skid tendency and signals the Seatbelt Control ECU to retract the front seatbelts (through engaging the belt clutch motor and operating the Pre-tensioners to restrain occupants prior to the collision). Maximum braking force is applied as soon as the driver presses the brake pedal. If no collision occurs, the seatbelts and BA return to their normal state. In a front or rear wheel skid tendency, PCS operates only the seatbelt retraction function, with seatbelts returning to the normal state once the vehicle
is stabilized.
The Dynamic Radar Cruise Control System consists of four main types of control:
Constant-Speed Control, used when no vehicle is traveling ahead to maintain a constant set vehicle speed
Deceleration Control, when a vehicle is detected ahead that’s traveling at a slower speed and the IS F’s speed is subsequently reduced in accordance with the vehicle ahead
Follow Control, when a vehicle is detected ahead and the IS F maintains a vehicle-to-vehicle distance that is proportionate to the speed of that vehicle
Acceleration Control, when the system detects that either the vehicle ahead or the IS F has changed lanes, and accelerates gradually to a set vehicle speed and then maintains that speed
Like the conventional cruise controls, controls for Dynamic Radar Cruise Control are mounted on the right side of the steering wheel, conveniently positioned to maximize accessibility while minimizing distraction. And, while this feature is designed to enhance safety, there are limitations to the system, which make it imperative to understand that only the driver—not the Pre-Collision System (PCS) with Dynamic Radar Cruise Control—has the ability to recognize and avoid obstacles, or execute emergency avoidance maneuvers.
