DYNAMIC RADAR CRUISE CONTROL SYSTEM SYSTEM DESCRIPTION

The cruise control switch is used to turn the dynamic radar cruise control system on and off, as well as operate 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP and CANCEL. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAP-UP, and + (ACCEL) functions are operated with the same switch. The cruise control switch is an automatic return type switch which turns on only while operating it in the direction of each arrow and turns off after releasing it.

1. This system maintains the vehicle at the speed that the driver has set, as long as there are no vehicles ahead. In addition to this, the system maintains the vehicle-to-vehicle distance that has been set by the driver. If the system detects a vehicle driving at a slower speed ahead while the driver is driving at a constant speed, it controls the engine to decelerate the vehicle. If further deceleration is required, the system controls the brake actuator assembly in order to apply the brakes. Thereafter, if there are no vehicles ahead within the set vehicle-to-vehicle distance because either the vehicle ahead or the driver has changed lanes, the system accelerates slowly to reach the set speed and resumes driving at this speed.

2. Vehicle-to-vehicle distance control mode is designed to control vehicle speed and vehicle-to-vehicle distance using the constant speed function, deceleration cruising function, follow-up cruising function, and acceleration cruising function.

3. The millimeter wave radar sensor assembly and driving support ECU assembly control the system while vehicle-to-vehicle distance control mode is operating, and send signals to each actuator and ECU.

4. In vehicle-to-vehicle distance control mode, the dynamic radar cruise control system receives signals from the forward recognition camera, yaw rate sensor (airbag sensor assembly) and the steering angle sensor. Based on these signals, the system then estimates curve radius and compensates for information on the preceding vehicle while turning. It can also compensate using brake control when approaching another vehicle.

5. This system judges the presence of a vehicle in front and the distance to it based on the signals from the millimeter wave radar sensor assembly and forward recognition camera while vehicle-to-vehicle distance control mode is operating. Using this information, the system informs the driver of danger with the warning buzzer, performs brake control, and turns on the stop lights when approaching a vehicle in front.

6. The dynamic radar cruise control system performs the following controls (example).

   Tech Tips

   
   

   • Vehicle distance increases and decreases in accordance with vehicle speed.

   • Control conditions are indicated on the multi-information display in the combination meter assembly.

   

   *1	Drives the vehicle at a constant speed (set speed: 100 km/h (60 mph))	*2	Decelerates the vehicle from the set speed to the speed of the preceding vehicle (80 km/h (50 mph))*
   *3	Follows the preceding vehicle while maintaining an appropriate vehicle-to-vehicle distance according to the speed of the preceding vehicle (80 km/h (50 mph))	*4	Gradually accelerates the vehicle to the set speed and maintains the speed

   *: Brake control and either throttle valve control*1 or fuel injection volume control*2 is performed to decelerate the vehicle. If deceleration is insufficient and the distance to the preceding vehicle becomes too short, the vehicle approach warning buzzer sounds to warn the driver to take an appropriate action (such as braking).

   
   

   • *1: for 2AR-FE, 3ZE-FAE, 3ZR-FE

   • *2: for 2AD-FTV, 2AD-FHV, 2WW

*1	Cruise Control Indicator

The cruise control switch is used to turn the dynamic radar cruise control system on and off, as well as operate 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP and CANCEL. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAP-UP, and + (ACCEL) functions are operated with the same switch. The cruise control switch is an automatic return type switch which turns on only while operating it in the direction of each arrow and turns off after releasing it.

1. MODE CONTROL

   Push and hold the switch of the cruise control switch (ON/OFF) for 1.5 seconds or more with the dynamic radar cruise control system off to change to the constant speed control mode.

2. 

   *1	Cruise Control Indicator
   *2	Cruise Control SET Indicator

   SET CONTROL

   The vehicle speed is stored and vehicle-to-vehicle distance control mode begins controlling vehicle speed when the cruise control switch is pushed to -/SET while driving with the dynamic radar cruise control system on, and the vehicle speed is over the low speed limit. The cruise control SET indicator will display, and the set speed will be displayed in the multi-information display.

3. - (COAST) CONTROL

   When vehicle-to-vehicle distance control mode is controlling vehicle speed and the cruise control switch is pushed to -/SET and held in that position, the stored vehicle speed decreases by approximately 1 km/h (or 1 mph) or 5 km/h (or 5 mph)*.

   
   

   • *: w/o Wireless Door Lock Buzzer Answer Back Function

4. TAP-DOWN CONTROL

   When vehicle-to-vehicle distance control mode is controlling vehicle speed and the cruise control switch is tapped to the -/SET side (for 0.6 seconds or less), the stored vehicle speed decreases by approximately 5 km/h (or 5 mph) for each time the switch is tapped.

5. + (ACCEL) CONTROL

   When vehicle-to-vehicle distance control mode is controlling vehicle speed and the cruise control switch is pushed to +/RES and held in that position, the stored vehicle speed increases by approximately 1 km/h (or 1 mph) or 5 km/h (or 5 mph)*. Pushing the cruise control switch to +/RES while following a vehicle using vehicle-to-vehicle distance control mode does not increase actual vehicle speed, but changes only the set speed.

   
   

   • *: w/o Wireless Door Lock Buzzer Answer Back Function

6. TAP-UP CONTROL

   When vehicle-to-vehicle distance control mode is controlling vehicle speed and the cruise control switch is tapped to the +/RES side (for 0.6 seconds or less), the stored vehicle speed increases by approximately 5 km/h (or 5 mph) for each time the switch is tapped.

7. MANUAL CANCEL CONTROL

   Performing any of the following cancels dynamic radar cruise control system control of vehicle speed (the stored vehicle speed in the ECM is maintained).

   
   

   • Depressing the brake pedal.

   • w/ Shift Paddle Switch:

     The transmission is changed from 4th gear to 3rd, 2nd or 1st gear with the transmission shift switch assembly while the shift lever is in D or M.

   • for U760E, U760F:

     Moving the shift lever to any position except D or S (6th, 5th or 4th gear).

   • for U660F, K111, K111F, K114F:

     Moving the shift lever to any position except D or M (6th, 5th or 4th gear).

   • for Manual Transaxle:

     The transmission is changed 1st gear or R.

     Vehicle-to-vehicle Distance Control Mode: Cluch pedal is depressed for a certain period of time or longer.

     Constant Speed Control Mode: Depressing the clutch pedal.

   • Pulling the cruise control switch to CANCEL.

   Performing any of the following cancels dynamic radar cruise control system control of vehicle speed (the stored vehicle speed in the ECM is not maintained).

   
   

   • Turning the dynamic radar cruise control system off using the cruise control switch (ON/OFF).

8. RES (RESUME) CONTROL

   If control of vehicle speed by the dynamic radar cruise control system was canceled due to any of the manual cancel conditions (other than turning the dynamic radar cruise control system off using the ON/OFF switch), and if vehicle speed is more than approximately 50 km/h (or 31 mph), pushing the cruise control switch to +/RES restores and maintains the stored vehicle speed from the time of cancellation.