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 driving20 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 drivingWithin 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 stopped3 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.