Hyundai Santa Fe (DM): Description and Operation
System Overview
RPAS (Rear Parking Assist System) is an electronic driving
aid that warns the driver to be cautious while parking or in low speed environments.
The sensor uses ultrasonic waves to detect objects within proximity of the vehicle.
RPAS consists of four RPS 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 Block Diagram
System Operation Specification.
1. |
INIT mode
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2. |
NORMAL Mode
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Sensing Area
1. |
Measurement condition – PVC pole (diameter 75mm,
length 3m), normal temperature
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2. |
Distance range detected objects (Measured directly
in front of sensor)
61cm(24.0in) ~ 120cm(47.2in) : ± 15cm(5.9in)
31cm(12.2in) ~ 60cm(23.6in): ± 15cm(5.9in)
Less than 30cm(11.8in) : ± 10cm(3.9in)
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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.
RPAS alarm system
When the RPAS sensor detects the object, warning is operated
by audible alarm device as like buzzer. RPAS sensor sends data to BCM with LIN
communication and BCM implements audible warning for each RPAS SENSOR by priority.
And it performs a role of gateway only when it sends visible alarm device such
as Cluster.
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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.
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System Operation Spec
When the system has the power (after IGN ON and R gear),
MICOM checks every sensor channel. In case it finds 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)
*α value definition
1. |
low priority sensor off : α = 0ms
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2. |
low priority sensor is 1st warning level : α < 340ms
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3. |
low priority sensor is 2nd warning level : α < 170ms
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*β value definition
1. |
low priority sensor is 1st warning level : β = 1700ms
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2. |
low priority sensor is 2nd warning level : β = 1700ms
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3. |
low priority sensor is 3rd warning level : β = 700ms
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Alarm control by sensing distance is as below
1. |
First warning area (61cm ~ 120cm)
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2. |
Second warning area (31cm ~ 80cm)
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3. |
Third warning area (less than 30cm)
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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.
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- |
In third level alarm, indicator flickers at intervals
of a second.
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- |
In normal alarm level display, RCR/RCL indicator
is combinated by priority.
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Communication Standard
This section defines the communication between RPAS and BCM.
RPAS 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. BCM (Body Control Module) 2. Ultrasonic sensor ※ Rear parking assist control unit function is built in BCM (body control unit). ...See also:
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