Engine Stop Control: Overview

i-stop (engine-stop control) permit condition 

• The conditions to stop the engine by the i-stop control are as follows:
  DETERMINATION CONDITION
  
  

  Determination module	Determination item	Determination condition
  PCM	Vehicle speed If i-stop control is performed (engine stop control) while vehicle is stopped	0 km/h {0 mph}
  	Vehicle speed If i-stop control is performed (engine stop control) while driving	20 km/h {12 mph} or less
  	Brake pedal	Brake pedal is depressed while in D or M position However, no brake pedal conditions during Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) and Cruising & Traffic Support (CTS) operation (1)
  	Brake fluid pressure	Brake fluid pressure is 1.35 MPa {13.8 kgf/cm 2 , 196 psi} or more while in D or M position (perform correction according to vehicle inclination angle) However, no brake fluid pressure conditions during Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) and Cruising & Traffic Support (CTS) operation (1)
  	Brake stroke	3 mm {0.1 in} or more
  	Panic brake	Not operating
  	ABS control	Not operating
  	Accelerator pedal	Released
  	Clutch pedal	Not applicable
  	MTX gear position	Not applicable
  	Vehicle conditions	Vehicle is stopped in D position (2)
  	Steering speed	15 deg/s or less
  	Steering angle If i-stop control is performed (engine stop control) while vehicle is stopped	Within 65° of center to left and right (After EPS control module learns center value)
  	Steering angle If i-stop control is performed (engine stop control) while driving	Within 20° of center to left and right (After EPS control module learns center value)
  	Steering torque	1.1 N.m {11 kgf.cm, 9.7 in.lbf} or less
  	i-stop OFF switch	OFF
  	Vehicle speed history (After engine started and driven once) If i-stop control is performed (engine stop control) while driving	Driving at a speed of 13 km/h {8.1 mph} or more During i-stop while driving (engine stop control): Driving at a speed of 30 km/h {19 mph} or more
  	Vehicle speed history (After engine started and driven once) If i-stop control is performed (engine stop control) while vehicle is stopped	3 km/h {2 mph}
  	Door (driver's side)	Closed (4)
  	Hood	Closed (5)
  	Vehicle inclination angle If i-stop control is performed (engine stop control) while vehicle is stopped	Within ±7° when level
  	Vehicle inclination angle If i-stop control is performed (engine stop control) while driving	Within ±1.1° when level
  	Seat belt (driver's side)	Fastened (3)
  PCM	Steering angle sensor initial setting	Completed
  	Battery condition setting	Completed
  	Engine coolant temperature	30-110°C {86-230°F}
  	Intake air temperature	100°C {212°F} or less
  	Altitude	3, 000 m {9842 ft} or less
  	System condition	i-stop related part DTCs are not recorded
  	Mazda M Hybrid battery voltage	20 V or more
  	Mazda M Hybrid battery condition	30 % or more
  	Mazda M Hybrid battery temperature	59°C {138°F} or less
  	ISG MOSFET temperature	100°C {212°F} or less
  	ISG monitoring board temperature	100°C {212°F} or less
  	Brake coordinated control end	Completed
  	Request deceleration speed	When any of the following conditions is met  There is a deceleration request by MRCC
  	Cylinder deactivation control	Vehicle is not being driven with 2 cylinders
  	Cylinder deactivation control	Other than SPORT mode
  BCM	+B (ROOM fuse) input	Yes
  	IG1 input	Yes
  	ACC input	Yes
  	IG1 output	Yes
  	ACC output	Yes
  	Push button	Not pressed
  	Door (all)	Closed
  	Trunk lid	Closed
  	Seat belt (driver's side)	Fastened (3)
  	Engine start	Engine was started by operating push button with key inside cabin (engine started first time)
  	Engine rotation speed	300 RPM or more is maintained after engine started
  	System condition	i-stop related part DTCs are not recorded
  TCM	TCM detection condition	All met (I-Stop_EST: On)
  	Panic stop	Brake pedal was not depressed suddenly within 4 s
  	TFT	20-117°C {68-242°F}
  	Gear position	Not in 2nd gear fixed mode
  	System condition	i-stop related part DTCs are not recorded
  Dash-electrical supply unit	Climate control unit determination condition	With full-auto A/C  All met (STOP_ST: Available) With manual A/C  All met
  	Cabin temperature (with full-auto A/C)	Difference between target cabin temperature and actual cabin temperature is a certain value or less (Cabin temperature control by A/C is normally performed)
  	A/C temperature (with full-auto A/C)	Setting other than MAX/MIN
  	Ambient temperature	-10-50°C {14-122°F}
  	Cold condition (with manual A/C)	Ambient temperature is 29°C {84°F} or less and evaporator temperature is 9°C {48°F} or less
  	Cold condition (with full-auto A/C)	Ambient temperature is 4°C {39°F} or more or evaporator temperature is 12°C {54°F} or less
  	Warm-up operation condition (with manual A/C)	Ambient temperature is 10°C {50°F} or more and engine coolant temperature is 60°C {140°F} or more
  Dash-electrical	Front defroster switch	OFF
  supply unit	System condition	i-stop related part DTCs are not recorded
  Electronically controlled brake unit	Operation request from PCM	Hill Launch Assist (HLA) control request signal from PCM is received
  	Vehicle inclination angle	Inclination is within ±6° with shift positioned in D/M/R or N/P (LON_ACCL_C: within ±0.104 G)
  	Wheel speed (4 wheels)	0 km/h {0 mph}
  	Brake pedal	Brake pedal is depressed
  	Brake fluid pressure	Approx. 0.45 MPa {4.6 kgf/cm2, 65 psi} or more
  	Accelerator pedal	Released
  	System condition	i-stop related part DTCs are not recorded
  (1) During Mazda Radar Cruise Control with Stop & Go function (MRCC with Stop & Go function) and Cruising & Traffic Support (CTS) operation, the engine is stopped by i-stop control without having to depress the brake pedal. (2) After the vehicle is stopped, the engine stops if the gear is shifted to N position. In addition, if the gear is shifted to P position after the vehicle is stopped in D position, the engine stop condition by the i-stop control is maintained. (3) If the seat belt is unfastened while the vehicle is stopped, i-stop is inhibited until a vehicle speed record is input once. (4) If a door is opened while the vehicle is stopped, i-stop is inhibited until a vehicle speed record is input once. (5) When the engine was started with the hood open, i-stop is inhibited until the ignition is switched OFF.

  i-stop (engine stop control) 

• When the i-stop (engine stop control) permit conditions are met, the PCM stops the engine based on the following controls:
  • Fuel injection control (fuel cut)
• Engine speed is reduced by the fuel cut.
  • Drive-by-wire control (throttle valve open/closed)
• By adjusting the throttle valve opening angle, the engine speed is reduced and the pumping loss is used to stop the engine.
  • Electric variable valve timing control (intake valve timing retard)
• Intake valve timing retard is performed for engine restart by i-stop control.