2018 / ECLIPSE CROSS / EC - Technical Information Manual
13 -FUEL > 13A-DIRECT INJECTION AND MULTIPOINT FUEL INJECTION (DI AND MPI) > AUTO STOP & GO (AS&G) SYSTEM<CVT><CVT>
AUTO STOP & GO (AS&G) SYSTEM <CVT>
 
 
The purpose of the Auto Stop & Go (AS&G) system is to reduce CO2 exhaust gases from vehicles. The AS&G system automatically should stop the engine when the vehicle is stopped. And also the system should automatically restart the engine when the vehicle is started. The engine-ECU judges whether the engine should be stopped or restarted. The engine-ECU also stops or restarts the engine.
The engine-ECU monitors the vehicle condition by using the signals from sensors and each ECU. If the specified conditions are satisfied, the engine-ECU should stop the engine (auto stop). When the driver tries to start the vehicle, the engine-ECU should swiftly restart the engine (auto start).

SYSTEM CONFIGURATION
 

 
 
 
 
1. Auto Stop & Go (AS&G) System
 
When the ignition switch is turned ON or when the engine starts, the AS&G system should automatically be turned ON. The driver can turn OFF the AS&G system by pressing the AS&G OFF switch. At that time, the AS&G OFF display screen should be turned ON in the combination meter. When the AS&G OFF switch is pressed again, the AS&G system should be turned ON.
 

 
 
2. Auto Stop Control
 
The engine-ECU will stop the engine when the following operation is performed or when the adaptive cruise control (ACC) system stops the vehicle while the AS&G display screen illuminates.
  1. Depress the brake pedal when the vehicle is running to stop the vehicle. (D range transmission)
  2. If the brake pedal is depressed continuously when the vehicle has completely stopped, the engine will automatically stop.
During the auto stop, the AS&G display screen is turned ON in the combination meter. When one or more of following conditions are satisfied, the engine-ECU should prohibit the auto stop.
  • After the key/engine switch is used to start the engine, approximately 30 seconds have not been taken.
  • The accelerator pedal is depressed.
  • If the vehicle is stopped again within approximately 10 seconds of the engine auto start.
  • More than the vehicle speed of approximately 5 km/h is not detected even once after the engine start, including the engine start of the auto start.
  • Engine coolant temperature is 50°C or less.
  • The battery is not fully charged.
  • Battery deterioration is detected.
  • Battery temperature: -5°C or less, 80°C or more
  • The vacuum pressure of the brake booster is less than specified value.
  • The brake fluid pressure is less than the specified value.
  • The driver's seat belt is unfastened.
  • The hood is opened.
  • The driver's door is opened.
  • The parking brake is applied.
  • The steering wheel is being steered.
  • The vehicle slant angle is more than specified value.
  • The ambient temperature is lower than approximately 0°C.
  • The engine-ECU detects an abnormality in the AS&G system.
  • The auto stop prohibition signal is received from each ECU with the conditions described in the following table.
ECUAuto stop prohibition condition
CVT-ECU
  • CVT fluid temperature: 21°C or less, 107°C or more
  • Change gear ratio: Not in Low state
  • A speed of 5 km/h or more is never detected
  • 5 seconds have not passed after auto start
  • The CVT-ECU detects abnormality
ASC-ECU
  • The ASC-ECU detects abnormality
A/C-ECU
  • When the following are not set while the blower fan is ON:
    1. Engine coolant temperature: Less than the specified temperature (changed by ambient temperature)
    2. Ambient temperature: Less than the specified temperature
    3. Room temperature: Outside the specified value range
    4. Evaporator temperature: More than the specified temperature (changed by ambient temperature)
  • The front defogger mode is turned on
  • The temperature set switch is set to the lowest or highest temperature
 

 
 
3. Auto Start Control
cautionIf the following motions are carried out during the auto stop even one time, the engine-ECU should blink the AS&G display screen in the combination meter and prohibits the auto start. Even if trying to return to the previous status after that, the auto start should be prohibited. When restarted, the engine must be started by the key/engine switch.
  • In case the hood is opened.
noteWhen in the states mentioned above, the engine-ECU should send the signal to the combination meter via the CAN to sound the warning buzzer built into the combination meter. This warns the driver that this is different from normal use.
 
 
Normal Auto Start
Depending on the driver's operation, the engine-ECU turns off the AS&G display screen that was displayed in the combination meter while quickly starting the engine. Auto start should function either by brake pedal or accelerator pedal operation. Auto start conditions are as follows:
<Vehicles without brake auto hold and ACC, or when the brake auto hold and ACC are not in operation>
Selector leverBrake pedalAccelerator pedal
PReleased then depressed againDepressed
RAuto start functions regardless of pedal state
NReleasedDepressed
DReleasedDepressed
<When the brake auto hold is in operation or ACC is in operation>
Selector leverBrake pedalAccelerator pedal
PReleased then depressed againDepressed
RAuto start functions regardless of pedal state
N-*Depressed
D-*Depressed
note
  • If the selector lever is moved from D range to outside D range, and then back to D range again, the engine will the engine will perform auto start.
  • * : The engine does not start automatically even if the brake pedal is released.
 
 
Forcible Auto Start
When one of the following conditions is satisfied during the auto stop, the engine-ECU should start the engine swiftly despite the driver's determination. Also, the engine-ECU should turn on the starter relay to drive the starter. At that time, the AS&G display screen in the combination meter should go off as well as the normal auto start.
  • The vehicle speed is more than 3 km/h.
  • The battery's charge state has deteriorated
  • Vehicle electrical load has increased
  • The steering wheel is being steered.
  • 3 minutes after Auto Stop state.
  • The driver's seat belt is unfastened.
  • The driver's door is opened.
  • The vacuum pressure of the brake booster is less than specified value.
  • The engine-ECU detects an abnormality in the AS&G system.
  • When the electric parking brake is applied <Vehicles with electric parking brake>
  • The engine start request signal is received from each ECU with the conditions described in the following table. engine start request signal
ECUEngine start request condition
CVT-ECU
  • The CVT-ECU detects abnormality
ASC-ECU
  • The ASC-ECU detects abnormality
A/C-ECU
  • A/C: OFF → ON
  • The front defogger mode is turned on
  • The temperature set switch is set to the lowest or highest temperature
 
 
4. Control for Increasing Voltage
At the auto start, the engine-ECU sends the increasing voltage request signal to the DC/DC converter. When receiving the signal, the DC/DC converter should temporarily switch the relay in the unit to the voltage converter of the DC/DC converter. The voltage converter increases the battery voltage dropping during cranking to 12.2 V. This can prevent the jumpy sound of the audio equipment due to the battery voltage drop at the auto start. The DC/DC converter should stop increasing the voltage when the input voltage returns to 12.2 V. There is a DC/DC converter in both the control system and the entertainment system. The control system controls the power supply voltage of the CVT-ECU and ASC-ECU. The entertainment system controls the power voltage supply of MMCS, audio, etc.
 
 
5. AS&G System Display Control
 
The engine-ECU sends the signal to the combination meter via CAN, corresponding to the operation of the AS&G system. The combination meter that received the signal turns ON or blinks the AS&G/AS&G OFF display screen, and shows a warning display. Then the AS&G system status is informed to the driver.

AS&G system
Condition
Multi information display
Warning displayAS&G/AS&G OFF display screen
OFFIgnition switch: ON (engine is stopped.); After several seconds are taken-"AS&G OFF" displayed
During engine running-"AS&G OFF" displayed
ONIgnition switch: ON (engine is stopped.); After several seconds are taken--
During idling and driving
(The idling stop operation standby incomplete)
--
During idling and driving
(The idling stop operation standby complete)
-"AS&G" displayed
During auto stop-"AS&G" displayed
Hood is opened-"AS&G" blinked
During auto stop, hood is openedSHIFT TO P POSITION THEN RESTART ENGINE"AS&G" blinked
Driver's door is opened-"AS&G" blinked
Driver's seat belt is unfastened-"AS&G" blinked
During auto stop, selector lever is placed on "P" position and brake pedal is released-"AS&G" blinked
AS&G system is abnormal*AS&G SYSTEM SERVICE REQUIRED"AS&G OFF" blinked
ON/OFFAfter ignition switch ON; for several seconds-"AS&G OFF" displayed
note*: The engine-ECU, CVT-ECU or the ASC-ECU may detect a diagnosis code. Check whether the each ECU detects a diagnosis code or not.
 
 
 
6. Starter Relay Control
 

At Normal Engine Start
  • When the following signal is input, the engine-ECU should turn ON the power transistor of the starter relay in the unit. This allows the starter relay to be turned ON, and then the starter is driven.
    If the immobilizer result checking has some discrepancy, the output to the starter relay should be turned OFF. The starter, therefore, should not be driven.
    • Ignition switch-ST signal
    • Selector lever: P or N range
At Engine Start from Auto Stop Status
  • When the auto start conditions are satisfied during the auto stop, the engine-ECU should turn ON the power transistor of the starter relay in the unit. This allows the starter relay to be turned ON, and then the starter is driven.
 




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