i-stop CONTROL [SKYACTIV-G 2.0]

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Outline

Control Table

Block Diagram

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Operation

Engine stop control

i-stop (engine-stop control) permit condition

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

Purpose	Condition item
Driveability	Vehicle speed	0 km/h {0 mph}
	Brake pedal	Brake pedal depressed in D position or M position (except 2nd gear fixed mode) (If ABS operates during deceleration, i-stop operation is inhibited.)
	Brake fluid pressure	Brake fluid pressure is 1.25 MPa {12.7 kgf/cm2, 181 psi} or more in D position or M position (except 2nd gear fixed mode) (pedal force sufficient to suppress vehicle lurch when engine is restarted)
	Accelerator pedal	Released (foot removed from accelerator pedal)
	Vehicle conditions	Vehicle stopped in D position (After vehicle is stopped and shifted into N position, engine stops 0.6 s after operation. In addition, after vehicle is stopped in D position and if shifted into P position, engine stop condition continues by i-stop control
Marketability	Cabin temperature	Difference between target temperature in cabin and temperature in cabin is within a certain value (A/C cabin temperature control is performed)
	A/C temperature	Setting other than MAX/MIN
	Ambient temperature	-10―50 °C {14―122 °F}
	Steering speed	10 deg/sec or less (After EHPAS control module learned center value)
	Steering angle	-65―65 ° (Center) (After EHPAS control module learned center value)
	EHPAS control module consumption current	16 A or less
	i-stop OFF switch	OFF
	Vehicle speed history	3 km/h {2 mph} or more
	Advanced key	Authorization is possible/No authorization failure on previous engine stop by i-stop control (The i-stop operation is also inhibited if the battery for the advanced key is depleted.)
Safety	Battery charge condition	68.4 % or more (determined from current sensor signal))
	Battery fluid temperature	0—70 °C {32—158 °F}
	Battery voltage	11.2 V or more
	Estimated battery voltage during engine restart	7.45 or more*1
	Defroster switch	OFF
	Power brake unit vacuum	-43 kPa {-0.44 kgf/cm2, -6.2 psi} or less am3zzn00003464
	Door (front, rear)	Closed
	Bonnet	Closed*2
	Liftgate	Closed
	Vehicle inclination angle	When level, less than ± 12 %
	Seat belt (driver)	Fastened
	System condition	i-stop related module normal
System restriction	Number of starter operations	Within 180,000 times
	Number of starter relay operations	Within 180,000 times
	Time period from engine stop by i-stop control from vehicle stop	0.25 s or more
	ISC learning	Completed
	Battery conditioning learning	Completed
	Steering angle sensor initialization setting	Completed
	DSC sensor initialization	Completed
	Elapsed time after engine restart	Maximum 6.4 s or more (Engine stop time fluctuates according to i-stop control)
	PCM DTC	DTC except P2299:00 (Brake override system) not detected
Engine condition	Engine coolant temperature	55—110 °C {131—230 °F}
	Intake air temperature	100 °C {212 °F} or less
	ATF temperature	20―120 °C {68―248 °F}
Environment condition	Altitude	1,500 m or less

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.

―  Generator output control (generator load)

•  Engine speed is reduced by lowering the generator load.

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Engine restart control

i-stop (engine restart control) conditions

•  Conditions for restarting the engine during i-stop control (engine stopped) are as follows:

Driver operation	Brake pedal released → depressed while in P or N position
	Brake pedal depressed → released while in D or M position (except 2nd gear fixed mode)
	Accelerator pedal depressed while in D or M position (except 2nd gear fixed mode)
	Steering angle (D or M position (except 2nd gear fixed mode)): 70 deg/sec or more (after EHPAS control module learned center value)
	Steering angle (D or M position (except 2nd gear fixed mode)): -70° or less or 70° or more (after EHPAS control module learned center value)
	Engine start by key operation
	Shift operation	P or N position → D or L or R position
Marketability	A/C request
	A/C temperature MAX setting, MIN setting
	Battery charge 67.9% or less
	Battery charge rate is specified value or more
	Battery voltage is 11 V or less
	Estimated battery voltage when engine is restarted is 7.25 V or less
	i-stop OFF switch on
	•  The following conditions are met while in P or N position (determined that driver is not in vehicle). ―  Seat belt (driver): Not fastened ―  Door (driver): Open
	•  The following conditions are met, advanced key removed: ―  Seat belt (driver): Fastened ―  Door (driver): Closed ―  Door (Any door except driver): Open
Safety	Defroster switch on
	•  Any of the following conditions met ―  Brake fluid pressure is 0.35 MPa {3.6 kgf/cm2, 51 psi} or less while in D or M position (except 2nd gear fixed mode) ―  Brake fluid pressure is 13 MPa {133 kgf/cm2, 1885 psi} or less while in R position
	Power brake unit vacuum: -41 kPa {-0.42 kgf/cm2, -5.9 psi} or more am3uun00001955
	Vehicle speed: 1 km/h {0.6 mph} or more
	Engine stop time by the i-stop control: 120 s or more

i-stop (engine restart control)

•  When the i-stop (engine restart control) conditions are met, the PCM restarts the engine by the following controls:

―  Fuel injection control (from first time, fuel injection to specific cylinders (expansion stroke)

•  Fuel is injected to cylinders which are determined to be stopped at the expansion stroke. During i-stop control (engine stop), cylinders are identified based on the signal from the crankshaft position sensor and fuel injection is enabled to those cylinders which are identified first as being stopped in the expansion stroke.

―  DC-DC converter control

•  When the engine is restarted by the i-stop control, the battery voltage is decreased to operate the starter by supplying power from the battery. When the starter operates, the supply voltage for electronic devices is increased by the DC-DC converter.

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Indicator illumination request

•  The PCM sends an i-stop indicator light (green)/i-stop warning light (amber) illumination or flash request to the instrument cluster according to the vehicle conditions.

•  The i-stop indicator light (green)/i-stop warning light (amber) illumination/flash request conditions are as follows: