GENERAL INFORMATION



In addition to the conventional cruise control system*, an adaptive cruise control system (ACC), which maintains the distance from vehicle travelling in front, has been adopted.

note
  • If vehicle travelling in front accelerates faster than your vehicle’s set speed, your vehicle will be driven at your set speed.
  • If the vehicle travelling in front stops, your vehicle also stops.
  • The system does not function if the vehicle travelling in front is stationary or very slow, or much slower than your vehicle.
  • The system may not be able to maintain the distance if the radar is contaminated, vehicles are driven uphill or downhill repeatedly, another vehicle cuts in abruptly, or a motorcycle is travelling in front.

Control overview



Constant speed control



The vehicle is driven at a constant speed.

Deceleration and distance-keeping controls




  • If the vehicle travelling ahead decelerates, your vehicle also decelerates to maintain the distance. If the vehicle travelling ahead brakes to a standstill, your vehicle also brakes.
  • If the vehicle travelling ahead accelerates, your vehicle also accelerates within the set vehicle speed.
note The distance between the vehicle travelling ahead and your vehicle can be chosen from three settings on the ACC distance switch.

Acceleration control



If vehicle travelling in front accelerates faster than your vehicle’s set speed, your vehicle will accelerate until it reaches your set speed gradually, and then be driven at a constant speed.

CONSTRUCTION DIAGRAM





COMPONENTS AND FUNCTIONS


Component
Function
ACC/FCM-ECU

  • ACC status is changed based on the ACC/ cruise control system/ adjustable speed limitation control mode and on the signal of switch state sent from engine-ECU.
  • Signals of the ACC status (off, standby, active, temporary fail and system fail) are changed state and sent.
  • Acceleration/deceleration are calculated from the ACC status, subject vehicle speed and data which the radar detects, and Acceleration/deceleration are sent to ASC-ECU.

ASC-ECU

  • The ASC-ECU controls brake pressure based on signals of acceleration/deceleration and the target deceleration received from ACC/FCM-ECU.
  • ASC-ECU triggers the stop lamp when the automatic brake is activated.
  • ASC-ECU internal ACC status is switched based on basically signal of ACC status received from ACC/FCM-ECU and sent as signal.
  • Target engine torque and target primary speed <Vehicles for CVT> are sent engine-ECU according to the acceleration/deceleration received from ACC/FCM-ECU.

Combination meter
ACC display screen
Contents of display and buzzer are changed according to signal of ACC status, Display request and buzzer request sent from ACC/FCM-ECU when signal of control mode sent from engine-ECU is ACC ON.
Cruise control switches
ACC ON/OFF switch
Power switch for ACC.
note
  • The system activates by pressing the switch briefly (within 1.5 seconds).
  • The cruise control system activates by pressing the switch for certain period (1.5 seconds or more).
ACC distance switch
The distance from vehicle travelling in front is set with the distance switch.
CVT-ECU <Petrol engine>
Target primary is changed from general control map to cruise control system, ACC control map according to signals of cruise control system control flag, and T/M is controlled by accelerator pedal position sensor and target primary speed which are received from engine-ECU.
A/T-ECU <Diesel engine>
Control map is changed from general control map to cruise control system, ACC control map according to signals of cruise control system control flag, and T/M is controlled by accelerator pedal position sensor which are received from engine-ECU.
Diagnosis connector
If the M.U.T.-III is connected, the diagnosis code and data list from the ACC/FCM-ECU can be read.
Engine-ECU

  • Signals of state of steering switches (including failure judgement result) are sent.
  • Acceleration/deceleration are controlled according to ACC target torque received from ASC-ECU when ACC mode is ON and ACC status is active. Engine-ECU has cruise control module as a part of engine-ECU. ACC target torque which is sent from ASC-ECU through signal is input to the cruise control module. Cruise control module outputs ACC target torque to engine-ECU.

ETACS-ECU

  • Stop lamp ON/OFF circuit which is driven at automatic brake control by ASC-ECU is equipped.
  • The state of ACC set distance switch is sent.

Steering wheel sensor (SAS)
Signals of the steering angle and the steering angle velocity are sent.