Contents: Bumpers ↧ Parking Assistance System ↧ System operation ↧ Tightening torques for threaded… ↧
Bumpers
The bumper systems are designed to withstand impacts with fixed obstacles at speeds of 8 km/h (5 miles per hour) without damage. After absorbing the impact energy, the bumpers return to their original position. The bumpers have an internal foam energy absorber and a polymer lining cover.
Parking Assistance System
The Parking Assistance System (PAS) is an electronic system designed to generate an audible signal to inform the driver of obstacles near the rear of the vehicle during reversing maneuvers, such as parking. The PAS system consists of four ultrasonic obstacle sensor units mounted on the rear bumper trim, an electronic controller mounted on the upper side of the wheel arch panel, and a buzzer located on the instrument panel. An ultrasonic locator (sonar) is used to detect obstacles in a specific area, measuring the time between the transmission and reception of ultrasonic waves.
When reverse gear is engaged, the sensors emit short ultrasonic pulses and then receive echo signals reflected from objects located within a certain distance range. The electronic controller uses echo signal data from one or more sensors to calculate the distance to an obstacle.
Note: Some sound-absorbing or sound-reflecting materials may affect the detection range. In exceptional cases, this may make it difficult to detect certain obstacles.
Warning! The parking assistance system does not relieve the driver of the responsibility and duty to be careful when reversing. Care must be taken at all times when driving.
System operation
When the ignition is turned on and reverse gear is selected, the buzzer sounds a tone for 0.3 seconds to indicate that the system is ready.
The controller supplies voltage to each sensor in turn, which converts it into an ultrasonic pulse.
If there is an obstacle in the detection zone, the ultrasonic pulse will be reflected (echoed) and received by the same sensor, or another one adjacent to it.
The echo signal is amplified, processed and returned to the controller in digital form. The controller processes this data and informs the driver of the obstacle by issuing an intermittent sound signal through the buzzer.
Four sensors are arranged on the rear bumper trim in such a way as to provide some overlap of the directional patterns. This ensures the best coverage of the detection zone. The maximum detection range is 150 cm.
The detection area is divided into four warning zones. As shown in the following table, the frequency of the sound signals decreases as the distance to the obstacle decreases.
|
Detection Zone
|
Left corner, right corner (cm)
|
Left middle, right middle (cm)
|
Sound is on
|
Sound is off
|
|
1
|
20 ~ 30
|
20 ~ 30
|
Continuously
|
-
|
|
2
|
31 ~ 60
|
31 ~ 60
|
40 ms
|
280 ms
|
|
3
|
61 ~ 80
|
61 ~ 90
|
40 ms
|
480 ms
|
|
4
|
-
|
91 ~ 150
|
40 ms
|
680 ms
|
|
Ready signal
|
-
|
-
|
300 ms
|
-
|
- LU - Left corner sensor
- PU - Right corner sensor
- LS - Left middle sensor
- PS - Right middle sensor
Tightening torques for threaded connections
|
PROGRAM
|
Nm
|
pound-foot
|
pound-inch
|
|
Front impact bar bolts.
|
22
|
16
|
-
|
|
Front Bumper Lower Trim Bolts
|
10
|
7
|
-
|
|
Wheel arch lining bolts
|
2
|
-
|
18
|
|
Rear Impact Bar Bolts
|
22
|
16
|
-
|
|
Rear Bumper Upper Trim Screws
|
2
|
-
|
18
|
|
Rear Obstacle Warning System Mounting Screw
|
4
|
-
|
36
|
|
Rear Obstacle Warning Controller Nuts
|
8
|
-
|
71
|
|
Power Steering Fluid Return Line Mounting Bolts
|
10
|
7
|
-
|
(The original text can be found on the website chevyman.ru)