What is an automotive ACC module
The automotive ACC module is an adaptive cruise control module that realizes the intelligent cruise control function of the vehicle by working in coordination with sensors such as radar.
Youdaoplaceholder0 Core Functions and definitions
Youdaoplaceholder0 The automotive ACC Module (Adaptive Cruise Control Module) is the core component of the adaptive cruise control system. It is responsible for monitoring the road conditions ahead through sensors such as radar and cameras, and automatically adjusting the vehicle speed to maintain a safe distance from the vehicle in front. Its core functions include:
Youdaoplaceholder0 Intelligent following : Automatically accelerate or decelerate based on the speed of the vehicle in front, and even stop (some advanced versions support full-speed range following).
Youdaoplaceholder0 cruise control : Drive at the set speed when there is no vehicle in front.
Youdaoplaceholder0 Safety warning : When the braking capacity of the system is insufficient, it alerts the driver to intervene through sound and light.
Youdaoplaceholder0 technology implementation
Youdaoplaceholder0 sensor collaboration : Relying on millimeter-wave radar or infrared beams to detect the distance and speed of the vehicle in front, some models combine cameras to improve recognition accuracy.
Youdaoplaceholder0 control logic : The expected acceleration is calculated through the electronic control unit (ECU), and the engine and braking system are linked to perform operations.
Youdaoplaceholder0 Application scenarios and limitations
Youdaoplaceholder0 applicable scenarios : highways, urban congested sections and other environments with good road conditions.
Youdaoplaceholder0 limitations :
Unable to cope with extreme weather conditions (such as heavy rain, thick fog) or complex road conditions (sharp turns, sudden traffic cuts).
The driver needs to stay focused. The system is only an auxiliary function.
The damage of the car's ACC module (adaptive cruise control module) will cause the vehicle's ACC system to fail to function properly, specifically manifested as the failure of the cruise control function. The following are the key information and handling suggestions:
Common causes of faults
Youdaoplaceholder0 Sensor failure : The radar sensor or camera is blocked or damaged, which may cause abnormal signals due to foreign object obstruction or wiring issues.
Abnormal line connection : Short circuit or poor contact in the radar module line may cause the system to falsely report fault codes.
Youdaoplaceholder0 module bracket breakage : Collision may cause the bracket to break, and long-term tilting may affect the calibration accuracy.
Handling suggestions
Youdaoplaceholder0 check the sensor status
Clear foreign objects from the radar/camera area at the front of the vehicle to ensure there is no obstruction.
Check whether the radar bracket is broken. If necessary, repair or replace it.
Youdaoplaceholder0 professional maintenance
If the module is damaged and needs to be replaced with original factory parts, it is recommended to contact the 4S store for inspection and repair.
During the warranty period, free maintenance of the circuit or module can be requested.
Youdaoplaceholder0 regularly maintain
Regularly inspect the vehicle's electronic control system to prevent module displacement or bracket breakage due to collisions.
If the module is damaged and cannot be repaired, original factory parts need to be replaced to ensure system stability.
The faults of the ACC system are mainly caused by abnormal radar/sensor, system software and hardware faults, and line problems , specifically manifested as radar obstruction, sensor damage, control module failure or poor line connection, etc.
Youdaoplaceholder0 Core fault cause
Youdaoplaceholder0 radar system anomaly .
The radar probe was blocked by snow and mud, resulting in detection failure.
Hardware damage to the radar module or calibration offset (such as changes in installation position due to jolts).
Youdaoplaceholder0 sensor failure .
The millimeter-wave radar/camera is contaminated (such as oil stains, insect carcasses attached).
The infrared sensor was physically damaged due to water ingress and collision.
Sensor poisoning (such as poor-quality oil affecting oxygen sensors).
Youdaoplaceholder0 control system anomaly .
Program error in the power control module (PCM) or electronic control unit (ECU).
The software version of the ACC system is outdated or has vulnerabilities.
Youdaoplaceholder0 Auxiliary influencing factors
Youdaoplaceholder0 Power supply and line issues .
Voltage fluctuations or model mismatches after battery replacement.
The wiring harness is aged and damaged, and the interfaces are oxidized with poor contact.
Youdaoplaceholder0 environmental interference .
Heavy rainfall or heavy snow affects the transmission of electromagnetic waves.
Metal reflection inside the tunnel causes signal interference.
Youdaoplaceholder0 human factors .
Vehicle modification causes the radar detection area to be blocked (such as not the original factory grille).
The radar module was not calibrated in time after the collision accident.
Youdaoplaceholder0 troubleshooting suggestions
Youdaoplaceholder0 priority investigation items .
Clean the contaminants on the surface of the radar probe and camera.
Use dedicated diagnostic devices to read fault codes (such as Volkswagen VAS, Mercedes-Benz Star Diagnosis).
Youdaoplaceholder0 Professional maintenance requirements .
After replacing the front windshield or bumper, the ADAS system needs to be recalibrated.
When there is a malfunction in the control module, the 4S store needs to perform program flashing or component replacement.
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