Kia Optima Hybrid: Parking Assist System / Description and Operation

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual / Body Electrical System / Parking Assist System / Description and Operation

System Overview

PAS(Parking Assist System) is an electronic driving aid device warning driver to be cautious when they park or speed low after detecting an object on side and behind of vehicle by using the feature of ultrasonic waves.

PAS consists of four PS sensors which are detecting the obstacles and transmit the result separated into three warning levels, the first, second and third to BCM by Lin communication.BCM decides the alarm level by the transmitted communication message from the slave sensors, then operate the buzzer or transmits the data for display.

System Operation Specification.

INIT mode

(1)	System initializing time is 500ms after IGN1+ R Gear.

(2)	PAS recognizes LID and sets the sensor ID up during initialization.

(3)	PAS activates each sensor and then executes the diagnosis after finishing initialization of BCM

(4)	PAS Starting buzzer” is normally worked, when sensor does not send an error message and after finishing error diagnosis.

(5)	If any failure is received from the any sensors, PAS Starting Buzzer” does not work but the failure alarm is operated for a moment. If you have display option, warning sign is also shown on it.

(6)	Buzzer for sensor failure is operated once, but display is shown continuously until it is repaired completely.

NORMAL Mode

(1)	Lin communication starts and keeps the routine after IGN1 ON+R gear

(2)	BCM send a message once to each sensor for operating request to check the initial status of the system and four sensors response at a time. At this time, if there is no problem, the alarm starts after 500ms of R gear shifting at 300ms intervals.

(3)	After initialization, normal mode starts 100ms later after finishing alarm output.

(4)	Alarm for obstacles is divided into 3 levels. The first and second are intermittent sound, and the third alarms continuously

(5)	In display, the data of each sensor is sent from BCM to display, for example Cluster. CAN communication is used for transmission and maximum gateway time is 50ms.

(6)	The efficient vehicle speed of PAS operation is under 10Km/h.

(7)	Refer to ‘Digital PAS Project LIN communication’ for the more detailed communication specification.

TUNNING MODE

(1)	Basically, start condition is the same as NORMAL MODE and use TUNING TOOL as a MASTER instead of BMC MASTER.

(2)	Therefore, BCM is not connected with LIN BUS

(3)	TUNING TOOL displays the way of analog after receiving the reference and envelop data as a format of LIN Diagnostic frame by communicating with sensors.

(4)	Refer to ‘Digital PAS Project_LIN_communication’ for the more detailed communication Specification.

CONFIGURATION MODE

(1)

Purpose of CONFIGURATION MODE is following.

–	Check assigned ID for each sensor

–	Check variant ID for each sensor

(2)	Basically, start condition is the same as NORMAL MODE and use TUNING TOOL as a MASTER instead of BCM MASTER.

(3)	Therefore, BCM is not connected with LIN BUS.

(4)	TUNING TOOL checks and assign Supplier ID and Function ID.

(5)	Refer to ‘Digital PAS Project LIN communication’ for the more detailed communication Specification.

Sensing Area

1.	Measurement condition – PVC pole (diameter 75mm, length 1m), normal temperature

2.	Distance range detected objects (Measured directly in front of sensor) 61cm(24.0in) ~ 100cm(39.4in) : ±15cm(5.9in) 31cm(12.2in) ~ 60cm(23.6in): ±10cm(3.9in) Less than 30cm(11.8in) : ± 10cm(3.9in)

Horizontal Sensing Area

Vertical Sensing Area

Distance Measurement

Direct Measurement

Transmission and Reception are executed with one sensor

(RL, RCL, RCR, RR each sensor execution)

Indirect Measurement

(RCL > RL, RCL > RCR, RCR > RCL, RCR > RR Execution in order)

With two or three sensors, one of them sends the transmission and the others get the reception.

Direct and Indirect Measurement at once

With two or three sensors, the one sensor performs both transmission and reception, and the others perform only reception.

PAS alarm system

When the RPAS sensor detects the object, warning is operated by audible alarm device as like buzzer. PAS sensor sends data to BCM with LIN communication and BCM implements audible warning for each PAS SENSOR by priority. And it performs a role of gateway only when it sends visible alarm device such as Cluster.

–

Sensor buzzer/display information processing method of BCM In case of RL/RR sensor information, the BCM handles each sensor information directly about Display and buzzer output function. Buzzer output of CL/CR sensor, BCM handles center combination information by priority both sensor, Otherwise, about fail display information,BCM send that to cluster each sensor information.

System Operation Spec

When the system has the power (after IGN ON and R gear), MICOM checks every sensor channel.In case it is not find any error, it sounds 300ms buzzer 500ms afterward.But it finds any error even a sensor, it sounds buzzer corresponding fault sensor instead of initial starting alarm. Function for normal mode entrance is as below

With R Gear, system function is as below

With R gear releasing, system function is as below

?acceptable error range on waveform ±10%

Alarm Output Specification classified by distance between sensors

Condition logic according to priority of alarm level is as below. (the identical sensor)

*? value definition

1.	low priority sensor off : ? = 0ms

2.	low priority sensor is 1st warning level : ? < 340ms

3.	low priority sensor is 2nd warning level : ? < 170ms

*? value definition

1.	low priority sensor is 1st warning level : ? = 1700ms

2.	low priority sensor is 2nd warning level : ? = 1700ms

3.	low priority sensor is 3rd warning level : ? = 700ms

Alarm control by sensing distance is as below

1.	First warning area (61cm ~ 100cm)

2.	Second warning area (31cm ~ 60cm)

3.	Third warning area (less than 30cm)

Period of fault alarm

(1)	With visible display

Visible Alarm Indicator Specification.

When the gear is applied to R, cluster lights the indicator as below figure.

When the system finds an object, it lights indicator immediately. During sensing an object, if there is no object, it lights indicator that is no alarm status for two seconds and then turns out afterward detecting an object.

(But when it turns third step alarm to No alarm status, it lights third step alarm for two second and turns out.)

–	It shows only the detecting position of obstacles.

–	In third level alarm, indicator flickers at intervals of a second.

–	n normal alarm level display, RCR/RCL indicator is combinated by priority.

Error Handling

LIN BUS Off error case

Section	Error recognition condition	Error releasing condition
InitialRoutine	LIN BUS OFF sensing once	Error is not released in initial mode.
Normal Routine	LIN BUS OFF is sensed times in a row	The fault is released when BCM or LIN Master senses LIN BUS ON four times in a row in normal mode

? Remark :

1.	In fault counting, output message or signal should be transmitted as a Last Valid value.

2.	Error in initial mode, fault buzzer (BCM) is operated with fault display(Cluster)

3.	Error in normal mode, fault is only displayed on Cluster without buzzer.

Sensor fault (LIN Msg : 0x08)

Section	Error recognition condition	Error releasing condition
InitialRoutine	Sensor fault Message sensing once	Error is not released in initial mode.
Normal Routine	Sensor fault Message sensing four times in a row	The fault is released when BCM or LIN Master senses LIN BUS ON four times in a row in normal mode

? In fault display, RCR/RCL indicator is displayed individually

? Remark :

1.	In fault counting, output message or signal should be transmitted as a Last Valid value.

2.	Error in initial mode, fault buzzer (BCM) is operated with fault display (Cluster)

3.	Error in normal mode, fault is only displayed on Cluster without buzzer

4.	When the error occurs in direct condition, the sensors sent the same status of error for indirect condition

Communication Standard

PAS send a detecting result of object and sensor diagnosis result to BCM according to this document, and BCM takes a role to alarm.

Indicator shows the transmitted position and alarm data, in alarm case, it finds the nearest DATA and alarms the nearest DATA first.

(Ex. In case, RL is first step alarm and RR is third step, RR alarm has priority.)

Components and Components Location

Component Location 1. BCM2. Ultrasonic sensor ? Parking assist control unit function and buzzer are built in BCM (body control unit). ...

Parking Assist Sensor Components and Components Location

Component ...

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