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<M/T><M/T>
AUTO STOP & GO (AS&G) SYSTEM <M/T>
 
 
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 depresses the clutch pedal during the auto stop, the engine-ECU should turn on the starter relay to drive the starter, also the engine-ECU should restart the engine (auto start).

System Configuration Diagram
 
 
 
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 while the AS&G display screen illuminates.
  1. While letting the vehicle run and perfectly stop, depress the clutch pedal to place the gearshift lever in the neutral position.
  2. Release the clutch pedal.
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 auto stop prohibition signal is received from the A/C-ECU.
  • The vacuum pressure of the brake booster is less than specified value.
  • The engine-ECU detects an abnormality in the AS&G system.
  • The driver's seat belt is unfastened.
  • The hood is opened.
  • The driver’s door is opened.
  • The ambient temperature is lower than approximately 0°C
  • The steering wheel is being steered.
 

 
 
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.
 
 
Normal Auto Start
When the driver depresses the clutch pedal during the auto stop, the engine-ECU should turn on the starter relay to drive the starter, also the engine-ECU should restart the engine. When the engine starts, the AS&G display screen in the combination meter should go off. When the following conditions are satisfied during the auto stop, the AS&G-ECU should prohibit the auto start.
  • AS&G system: OFF*
  • Gearshift lever position: except neutral position
note*: Pressing the AS&G OFF switch again to turn ON the AS&G system can enable the auto start.
 
 
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 charging status is deteriorated.
  • The vehicle electrical load increases.
  • The steering wheel is being steered.
  • The vacuum pressure of the brake booster is less than specified value.
  • The driver's seat belt is unfastened.
  • The driver’s door is opened.
  • The engine start request signal is received from the A/C-ECU.
  • The engine-ECU detects an abnormality in the AS&G system.
When the following conditions are satisfied during the auto stop, the engine-ECU should prohibit the forcible auto start.
  • AS&G system: OFF*
  • Gearshift lever position: except neutral position
note*: Pressing the AS&G OFF switch again to turn ON the AS&G system can enable the forcible auto start.
 
 
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.
 
 
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 openedRESTART ENGINE"AS&G" blinked
Driver's seat belt is unfastened-"AS&G" blinked
Driver's door is opened -"AS&G" blinked
During auto stop, gearshift lever is operated*1-"AS&G" blinked
AS&G system is abnormal*2AS&G SYSTEM SERVICE REQUIRED"AS&G OFF" blinked
ON/OFFAfter ignition switch ON; for several seconds-"AS&G OFF" displayed
note*1: When detecting that the gearshift lever is in other than neutral position during the auto stop, the engine-ECU should send the request signal to the combination meter via the CAN to sound the warning buzzer. When receiving the signal, the combination meter should sound the built-in warning buzzer. This warns the driver about the dangerous operation, prohibiting the auto start.
note*2: The engine-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 signals are 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
    • Clutch interlock switch ON signal (the clutch pedal is fully depressed)
At Engine Start from Auto Stop Status
  • When detecting one of the following conditions 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.
    • Neutral position switch: ON; Clutch monitoring switch: ON (the clutch pedal is depressed.)
    • Neutral position switch: ON and the conditions of the forcible auto start are satisfied




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