Parking and Back-Up Sensor System Description
Overview
The parking and back-up sensor system measures distances to objects by transmitting ultrasonic waves and receiving the echo from sound waves bouncing off nearby objects. The driver is informed of nearby objects with audible warning signals as well as visual signs through the multi-information display (MID) in the gauge control module.
Basic Control/Function
The sensors send out ultrasonic waves, receive waves reflected by an obstacle, determine the distance, and use the buzzer and multi-information display (MID) to tell the driver that an obstacle is near.
- The front corner sensors work any time the shift lever is shifted out of P position/mode, until the vehicle reaches about 9 mph (15 km/h). They do not come back on until slowing down to about 5 mph (8 km/h) or less.
- The rear corner and rear center sensors are only activated in shift to R position/mode.
- The parking and back-up sensor system is in active with its switch ON
- The sensors must be free of debris, snow, and ice to work correctly.
Sounding Pattern
The alarm sounding pattern and display of the obstacle detection location are performed by the obstacle detection indication requests and alarm sounding requests from the parking and back up sensor control unit. As shown in the following table, the time of sounding the buzzer is changed depending on the detection distance. A magnified warning display is generated in case of a failure of the parking sensor system.
Front
Rear
Automatic Learning Function of Transmission Type
The parking and back-up sensor control unit automatically learns the transmission type (M/T, A/T, CVT, DCT) at the time of initial power-on after installing the unit to the vehicle. Then, the unit controls the parking and back-up sensor system based on the learned transmission type. Once the transmission type is learned, it is never cleared.
Short-distance collision reduction brake
The parking sensor control unit recognizes the distance and position of the obstacle based on the parking sensor signal and determines whether the obstacle is in the vehicle traveling direction. When it is determined that the vehicle may collide with an obstacle, a brake control request signal is transmitted by F-CAN to reduce the collision. Also, depending on road conditions, weather conditions, vehicle conditions, etc., it may not work or may not fully perform.
When all of the following conditions are met, the parking sensor control unit sends a brake control request signal:
- The Vehicle speed is 1.2 mph (2 km/h) or more and 6.2 mph (10 km/h) or less.
- When it is determined that there is a possibility of collision with in operating speed range with the obstacle.
- No failure is detected.