Driver Assistance System (Dca): Overview Infiniti M37 IV

Component Description

Scheme 26

FUNCTION DESCRIPTION

When a vehicle is detected ahead

1. The vehicle ahead detection indicator comes ON.

When vehicle approaches a vehicle ahead

1. If the driver is not depressing the accelerator pedal, the system activates the brakes to decelerate smoothly as necessary. If the vehicle ahead comes to a stop, the vehicle decelerates to a standstill within the limitations of the system.
2. If the driver is depressing the accelerator pedal, the system moves the accelerator pedal upward to assist the driver to release the accelerator pedal.

When brake operation by driver is required

1. The system alerts the driver by a warning chime and blinking the vehicle ahead detection indicator. If the driver is depressing the accelerator pedal after the warning, the system moves the accelerator pedal upward to assist the driver to switch to the brake pedal.

Note. Depending on the position of the accelerator pedal, the system may not be able to assist the driver to release the accelerator pedal appropriately. When the driver depresses the accelerator pedal even further while the system is moving the accelerator pedal upward, the accelerator pedal control will be canceled. When the driver is depressing the accelerator pedal, the brake control by the system is not operated. When the driver is depressing the brake pedal, neither the brake control nor the alert by the system operates. When the ICC system is set, the DCA system will be canceled.

OPERATION DESCRIPTION

ICC sensor calculates a distance from a vehicle ahead and a relative speed to transmit the ICC sensor signal to the ADAS control unit via ITS communication. Based on the received signal, the ADAS control unit transmits a control signal to the accelerator pedal actuator via ITS communication and to the ABS actuator control unit (control unit) via CAN communication.

When vehicle approaches a vehicle ahead If the driver is not depressing the accelerator pedal, the system activates the brakes to decelerate smoothly as necessary If the driver is depressing the accelerator pedal, the system moves the accelerator pedal upward to assist the driver to release the accelerator pedal When brake operation by driver is required The system alerts the driver by a warning chime and blinking the vehicle ahead detection indicator. If the driver is depressing the accelerator pedal after the warning, the system moves the accelerator pedal upward to assist the driver to switch to the brake pedal

Scheme 27

Scheme 28

Operation Condition

ADAS control unit performs the control when the following conditions are satisfied.

1. When the DCA system setting on the navigation screen is ON.
2. When the dynamic driver assistance switch is turned to ON.
3. When the brake pedal is not depressed.
4. When the vehicle speed is above approximately 5 km/h (3 MPH).
5. When the vehicle ahead is detected.
6. When the ICC system is not set.

No Operation Condition

The ADAS control unit is not operate when the system is under any conditions of the no operation condition.

1. When the brake pedal depressed.
2. When the ICC system is set.
3. When the system judges that the vehicle comes to a standstill by the system control.
4. When the vehicle ahead is not detected.

Operation Cancellation Condition

The ADAS control unit cancels the operation when the system is under any conditions of the operation cancellation condition.

1. When the dynamic driver assistance switch is turned to OFF.
2. When the system malfunction occurs.
3. When ABS or VDC (including the TCS) operates.
4. When the VDC is turned OFF.
5. When the drive mode select switch is in SNOW position.
6. When driving into a strong light (i.e., sunlight).
7. When the ICC sensor body window is dirty and the measurement of the distance between the vehicles becomes difficult.

Operation At The Driver Operation

Give priority to the driver operation in the following situation.

1. When the accelerator pedal is depressed again.
2. When the brake pedal is depressed.

DESCRIPTION

The DTC is displayed on the information display by operating the ICC steering switch.

On Board Self-diagnosis System Diagram

Scheme 29

CONSULT performs the following functions via CAN communication with ADAS control unit and the communication with accelerator pedal actuator.

ECU IDENTIFICATION

Displays accelerator pedal assembly parts number.

1. Always perform the laser beam aiming adjustment after removing and installing or replacing the ICC sensor. CAUTION: The system does not operate normally unless the laser beam aiming adjustment is performed. Always perform it.
2. Perform the DCA system action test check that the DCA system operates normally.

1. Always perform accelerator pedal released position learning when replacing the accelerator pedal assembly or disconnecting the accelerator pedal position sensor connector.
2. Perform the DCA system action test check that the DCA system operates normally.

Always perform the DCA system action test to check that the system operates normally after replacing the ICC sensor, replacing the accelerator pedal assembly, or repairing any DCA system malfunction.

ADAS control unit judges the gear position based on the following signals.

1. Current gear position signal transmitted from TCM via CAN communication.
2. Value of gear ratio calculated from input speed signal transmitted from TCM via CAN communication.
3. Value of gear ratio calculated from the vehicle speed signal transmitted from ABS actuator and electric unit (control unit) via CAN communication.

ADAS CONTROL UNIT: Description

CAN controller controls the communication of CAN communication signal and ITS communication signal, and the error detection.

ACCELERATOR PEDAL ACTUATOR: Description

CAN controller controls the communication of ITS communication signal and the error detection.

The switch does not turn ON

1. When the DCA system setting is ON, the DCA system switch indicator does not illuminate even if the dynamic driver assistance switch is depressed.

The switch does not turn OFF

1. The DCA system switch indicator does not turn off even if the dynamic driver assistance switch is pressed when the DCA system switch indicator illuminates.

Note. The system cannot be operated when setting conventional (fixed speed) cruise control mode.

1. DCA system setting is not selectable on the navigation screen. NOTE: When the ignition switch is in ACC position, DCA system settings cannot be changed. "Distance Control Assist" is not indicated on the navigation screen. The switching between ON and OFF cannot be performed by operating the navigation system. The item of "Distance Control Assist" on the navigation screen is not active.
2. After turning ON the ignition switch or starting the engine, DCA settings of the navigation system cannot be selected for several tens of seconds under the following conditions: After replacing AV control unit. After erasing connection history of the navigation system. After erasing self-diagnosis results of AV control unit.
3. The DCA system setting differs from the one set at the previous driving. NOTE: Turn OFF the ignition switch and wait for 5 seconds or more.

The dynamic driver assistance switch can be turned ON/OFF, but the DCA system does not operate.

Note. Never start the operation under the following conditions. No operation condition When the brake pedal depressed When the ICC system is set When the system judges that the vehicle comes to a standstill by the system control When the vehicle ahead is not detected Operation cancellation condition When the dynamic driver assistance switch is turned to OFF When the system malfunction occurs When ABS or VDC (including the TCS) operates When the VDC is turned OFF When driving into a strong light (i.e., sunlight) When the ICC sensor body window is dirty and the measurement of the distance between the vehicles becomes difficult When ABS warning lamp is ON When drive mode select switch is in SNOW position

The warning chime may not sound in some cases when there is a short distance between vehicles. Some examples are

1. When the vehicles are traveling at the same speed and the distance between vehicles is not changing
2. When the vehicle ahead is traveling faster and the distance between vehicles is increasing
3. When a vehicle cuts in near own vehicle
4. The warning chime will not sound when own vehicle approaches vehicles that are parked or moving slowly.
5. The warning chime does not sound when the system does not detect any vehicle ahead. (Diagnose the conditions under which the system is detecting the vehicle ahead and when the system is malfunctioning. If there is any malfunction in detecting the vehicle ahead, check the system following the " «DESCRIPTION»(ref-573618-S23184933632013082200000) ".)

The dynamic driver assistance switch can be turned ON/OFF but the actuation force of accelerator pedal is not generated.

Note. When the vehicle ahead detection indicator does not illuminate, the control and warning with the system are not performed. The actuation force of accelerator pedal may not be generated sufficiently depending on depressing method or depressing amount of accelerator pedal.

Symptom check: Detection function may become unstable under the following conditions.

1. When the reflector of vehicle ahead is broken or dirty.
2. When the vehicle is driving on a curve such as S-curve where the curvature changes.
3. When the vehicle is driving on up-and-down road or passing the peak or foot of slope or passing the break of the inclination of hill.

When DCA system is active, the DCA system does not perform any control even through there is a vehicle ahead.

See also:
• DESCRIPTION
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