Abstract: A method of preventing dieseling of an engine for a mild hybrid electric vehicle includes steps of: determining whether an ignition switch is set to an OFF position; determining whether an engine stop condition is satisfied when the ignition switch is set to the OFF position; determining a target time point that completes a rotation of a mild hybrid starter and generator (MHSG) according to an engine speed when the engine stop condition is satisfied; and controlling a speed of the MHSG from a time point when the engine stop condition is satisfied to the target time point to reduce a speed of the engine.

Abstract: A method and an apparatus for starting an engine of a mild hybrid electric vehicle are disclosed. A method for starting an engine of a mild hybrid electric vehicle includes operating a mild hybrid starter & generator (MHSG) to perform an engine cranking operation, calculating an aging factor of the engine based on a time to reach a target RPM, calculating a moving average value of the aging factor, determining whether the moving average value of the aging factor is between a first reference value and a second reference value, and increasing cranking torque of the MHSG when the moving average value of the aging factor is between the first reference value and the second reference value.

Abstract: A method for controlling MHSG torque assist time of a mild hybrid electric vehicle includes detecting charge amount of a first battery, detecting indoor and outdoor temperature of the vehicle, expecting the MHSG torque assist time based on the outdoor temperature of the vehicle if the charge amount of the first battery exceeds a minimum charge amount, expecting an operation time of an air conditioner based on a data base of the air conditioner operating manners of a driver and a difference between the indoor and outdoor temperature of the vehicle, operating the MHSG to convert electricity from the first battery to the second battery, generating the MHSG to make the charge amount of the first battery to be maximum when the MHSG torque assist time is reached, and making the charge amount of the first battery to be maximum when the first battery becomes discharged.

Abstract: A method for controlling a mild hybrid electric vehicle may include detecting degradation state of a first battery, determining whether the degradation state of the first battery exceeds a degradation reference value or not, stopping normal operation of a mild hybrid starter & generator (MHSG) if the degradation state of the first battery exceeds a degradation reference value, determining whether an SOC value of a second battery is below a charge reference value or not, and operating the MHSG restrictively and inducing electric power conversion to the second battery if the SOC value of the second battery is below the charge reference value.

Abstract: A cruise control method of a mild hybrid electric vehicle may include determining whether a cruise mode is operated according to an output signal of a user interface device by a controller; determining whether a vehicle speed increasing signal is output from the user interface device by the controller; determining a compensation torque depending on difference of a predetermined target speed and the current speed of the mild hybrid electric vehicle according to the vehicle speed increasing signal by the controller; and controlling the operation of the MHSG by the controller to output the determined compensation torque.

Abstract: A method for controlling a mild hybrid vehicle may include determining, by a controller, whether an engine of the mild hybrid vehicle operates based on a demand torque of a driver of the mild hybrid vehicle; determining, by the controller, a torque of a starter-generator of the mild hybrid vehicle that assists a torque of the engine according to the demand torque of the driver based on a temperature of a turbocharger of the mild hybrid vehicle when the engine is operated; and operating, by the controller, the starter-generator to assist the torque of the engine based on the determined torque of the starter-generator.

Abstract: A method for controlling a mild hybrid vehicle may include determining, by a controller, whether an engine of the mild hybrid vehicle operates based on a demand torque of a driver of the mild hybrid vehicle; determining, by the controller, a torque of a starter-generator of the mild hybrid vehicle that assists a torque of the engine according to the demand torque of the driver based on a temperature of a turbocharger of the mild hybrid vehicle when the engine is operated; and operating, by the controller, the starter-generator to assist the torque of the engine based on the determined torque of the starter-generator.

Abstract: An apparatus for starting an engine of a mild hybrid electric vehicle may include: an ignition switch including a plurality of contact points; a mild hybrid starter & generator (MHSG) including a stator and a rotor internally disposed within the stator, and starting the engine or generating electricity according to an output of the engine; an MHSG wheel rotating integrally with the rotor, and having at least three teeth on a circumference thereof; an MHSG position detector configured for detecting positions of the teeth; and a controller configured for determining a top dead center (TDC) of a predetermined cylinder according to a signal of the MHSG position detector, and rotating the MHSG to start the engine.

Abstract: A method and an apparatus for controlling a hybrid electric vehicle are disclosed. The method includes: determining whether an uphill section is present on a driving route; calculating a regenerative braking amount at a downhill section following the uphill section; determining whether a state of charge (SOC) of a low voltage battery is equal to or greater than a first predetermined value at the time of entering the uphill section; determining whether an SOC of a high voltage battery is equal to or greater than a second predetermined value when the SOC of the low voltage battery is equal to or greater than the first predetermined value; and controlling the MHSG to generate auxiliary torque corresponding to the regenerative braking amount at the downhill section when the SOC of the high voltage battery is equal to or greater than the second predetermined value.

Abstract: A method and an apparatus for starting an engine of a mild hybrid electric vehicle are disclosed. A method for starting an engine of a mild hybrid electric vehicle includes operating a mild hybrid starter & generator (MHSG) to perform an engine cranking operation, calculating an aging factor of the engine based on a time to reach a target RPM, calculating a moving average value of the aging factor, determining whether the moving average value of the aging factor is between a first reference value and a second reference value, and increasing cranking torque of the MHSG when the moving average value of the aging factor is between the first reference value and the second reference value.

Abstract: An apparatus for controlling a mild hybrid vehicle includes an engine including a plurality of combustion chambers for generating driving torque by burning fuel, at least one intake valve and at least one exhaust valve for opening and closing each of the combustion chambers, an MHSG (mild hybrid starter and generator) for assisting the driving torque of the engine and selectively being operated as a generator, a VVA (variable valve apparatus) including an oil control valve that changes a direction of a path for flowing engine oil in order to adjust opening timing, lift, and duration of the intake valve and the exhaust valve, and a controller operating the MHSG to assist the engine torque when the oil control valve is faulty.

Abstract: A method for controlling a hybrid vehicle for a cold start. The method includes determining whether a combustion engine of the vehicle is idling. The method further includes, when the engine is idling, increasing a load of a hybrid starter/generator (HSG) until a selective catalytic reduction (SCR) catalyst reaches a desirable temperature.

Abstract: A vehicle system includes: an engine including a combustion chamber in which an air-fuel mixture is burned to generate energy, an intake manifold which supplies air to the combustion chamber, an injector which supplies fuel to the combustion chamber, and an exhaust manifold which discharges exhaust gas generated by combustion of the air-fuel mixture through an exhaust pipe; a hybrid starter and generator (HSG) which generates electricity by starting the engine or by using energy generated in the engine; a soot filter which is mounted to the exhaust pipe and collects particulate matters (soot) included in exhaust gas; and a control unit which controls an operation of the injector and controls an operation of the HSG, in which when the quantity of soot is larger than a predetermined quantity, the control unit increases a size of a load of the HSG by a predetermined load quantity until a temperature of the soot filter reaches a predetermined temperature.

Abstract: A method and an apparatus for heating a lambda detector of mild hybrid electric vehicle may include determining whether a measured value of the lambda detector is equal to or greater than a first reference value or is equal to or less than a second reference value when an overrun condition is satisfied; determining a first difference value between the measured value of the lambda detector and the first reference value and a second difference value between the measured value and the second reference value when the measured value of the lambda detector is equal to or greater than the first reference value or is equal to or less than the second reference value; determining a heating temperature and time according to the first difference value and the second difference value; and heating the lambda detector according to the determined heating temperature and time when a coasting condition is satisfied.

Abstract: A method and an apparatus for controlling a mild hybrid electric vehicle are provided. The method includes detecting data for operating the vehicle and determining a target torque of an engine based on the detected data. Additionally, the method includes determining whether an operating condition of a limiting logic of a combustion torque of the engine is satisfied based on a temperature of coolant of the engine and operating the limiting logic when the operating condition of the limiting logic is satisfied. A first available combustion torque of the engine is determined based on a speed of the engine and the temperature of the coolant when the limiting logic is operated and a target torque of a MHSG is determined based on the target torque of the engine and the first available combustion torque of the engine. The MHSG is then operated to generate the target torque of the MHSG.

Abstract: A method and system for controlling breakdown diagnosis are provided. The method includes sensing voltage values of respective batteries applied to a master and a slave via communication between the master and the slave. Additionally, a breakdown diagnosis logic is halted when the sensed battery voltage of the slave is less than a predetermined reference.

Abstract: A method for determining performance of a battery for a mild hybrid electric vehicle may include detecting a speed of the mild hybrid electric vehicle, a position value of an accelerator pedal, a position value of a brake pedal, and a state of charge (SOC) of the battery, determining whether a regenerative braking condition is satisfied, determining a demand braking amount of a driver, determining a regenerative braking allowance, operating a mild hybrid starter and generator (MHSG) to generate regenerative braking torque corresponding to the regenerative braking allowance, determining a target SOC increment amount, determining an actual SOC increment amount, and determining that the performance of the battery is deteriorated when a difference in value between the target SOC increment amount and the actual SOC increment amount is equal to or greater than a reference value.

Abstract: A method for controlling a mild hybrid electric vehicle includes steps of: detecting data regarding the mild hybrid electric vehicle; determining a target torque of an engine according to the detected data; determining whether knocking of the engine occurs according to the detected data; determining a retardation amount of an ignition timing when it is determined that the knocking occurs; comparing the retardation amount of the ignition timing with a value; determining a loss amount of a combustion torque of the engine according to the retardation amount of the ignition timing when the retardation amount of the ignition timing is equal to or greater than the value; determining a target torque of a mild hybrid starter & generator (MHSG) according to the target torque of the engine and the loss amount of the combustion torque of the engine; and operating the MHSG to generate the target torque of the MHSG.

Abstract: A method and an apparatus for heating a lambda detector of mild hybrid electric vehicle may include determining whether a measured value of the lambda detector is equal to or greater than a first reference value or is equal to or less than a second reference value when an overrun condition is satisfied; determining a first difference value between the measured value of the lambda detector and the first reference value and a second difference value between the measured value and the second reference value when the measured value of the lambda detector is equal to or greater than the first reference value or is equal to or less than the second reference value; determining a heating temperature and time according to the first difference value and the second difference value; and heating the lambda detector according to the determined heating temperature and time when a coasting condition is satisfied.

Abstract: A method for learning a clutch pedal may include determining whether a clutch pedal is operated; determining at least one of a depressed speed of the clutch pedal, a depressed value of the clutch pedal, and a speed of an engine at a shifting timing when the clutch pedal is operated; determining at least one of a moving average value of the depressed speed of the clutch pedal, a moving average value of the depressed value of the clutch pedal, and a moving average of the speed of the engine for a predetermined time; and storing the moving average value as a correction value for preventing an abrasion of a shift clutch.