Toyota Jidosha Kabushiki Kaisha

Hikokazu Akimoto

Takahiro Nishigaki

Osamu Harada

Akihiro Katayama

Keiichi Minamiura

Yohei Ogawa

Akihiro Katatayama

After an alkaline secondary battery is determined to be in an over-discharge state, a battery pack is discharged while an electrolytic solution contained in the alkaline secondary battery in the over-discharge state is decomposed so that traveling using power of a motor is performed. The electrolytic solution remains in the alkaline secondary battery even when the alkaline secondary battery is in the over-discharge state. The alkaline secondary battery in the over-discharge state can be discharged and a vehicle can be allowed to travel by decomposing the electrolytic solution. In this manner, a traveling distance available during evacuation traveling of the vehicle can be increased.

Vehicle on which traveling motor is mounted

An apparatus includes an engine; an exhaust gas control apparatus; a first and second electric motors; a power distributing portion that is connected to an engine shaft, a rotating shaft of the first electric motor, and a drive shaft that inputs/outputs power to/from the second electric motor; a power storage device that supplies/receives electric power to/from the two motors; a setting portion that sets a required torque of the drive shaft; and a control portion that, when there is a demand to decelerate the drive shaft while a fuel-supply to the engine is being prohibited, controls the engine and the two motors such that torque based on the required torque is output to the drive shaft and an engine speed is decreased to a self-sustaining speed with the fuel-supply and an adjustment that increases the intake air amount of the engine as the temperature of the power storage device increases.

Power output apparatus, hybrid vehicle provided with power output apparatus, and control method of power output apparatus

The internal combustion engine system makes detection on the occurrence or the non-occurrence of a misfire by comparing the 240-degree difference TDof the 30-degree rotation time T(CA) with the tentative detection reference value Aand comparing the detection base difference ratios Jand Jwith the ranges of the respective reference values B, B, Band Bwhen the exhaust gas recirculation is performed, in addition to the methodology in the non-performance of the exhaust gas recirculation, that is, in addition to the methodology of comparing the 360-degree difference TDof the 30-degree rotation time T(CA) with the tentative detection reference value Aand comparing the detection base difference ratios J, Jand Jwith the ranges of the respective reference values B, B, B, B, Band B(S, S). This arrangement enables to detect a misfire in any of cylinders of the engineaccurately even when the exhaust gas recirculation is performed or not performed.

Internal combustion engine system, vehicle having the internal combustion engine system, and engine misfire detection method for internal combustion engine

The engine misfire detection process according to one aspect of the invention first makes tentative detection on the occurrence or the non-occurrence of an engine misfire in execution of both vibration control and rotation speed control. In response to the tentative detection of an engine misfire, the engine misfire detection process subsequently makes final detection on the occurrence or the non-occurrence of an engine misfire. In the event of no final detection of an engine misfire, the engine misfire detection process makes tentative detection and final detection on the occurrence or the non-occurrence of an engine misfire in prohibition of the vibration control. In the event of still no final detection of an engine misfire, the engine misfire detection process makes tentative detection and final detection on the occurrence or the non-occurrence of an engine misfire in further prohibition of the rotation speed control. Even in the event of no final detection of an engine misfire in execution of both the vibration control and the rotation speed control, the procedure of the invention makes final detection on the occurrence or the non-occurrence of an engine misfire in prohibition of execution of the vibration control and further the rotation speed control. This arrangement desirably increases the detection frequency of engine misfires.

Engine misfire detection apparatus for internal combustion engine and engine misfire detection method

Upon no detection of the closing abnormality where the EGR valve does not become in the totally closed state (when the flag Fa is value '0'), the engine is controlled using the target fuel injection amount obtained from the correction of the basic fuel injection amount toward the increase direction, in the case that the engine is operated together with the recirculation of the exhaust in the preset high-load operation range (when the flag Fi is '1'). Upon detection of the closing abnormality (when the flag Fa is value &#x2018;1&#x2019;), the engine is controlled using the target fuel injection amount obtained from the correction of the basic fuel injection amount toward the increase direction, in the case that the engine is operated together with the recirculation of the exhaust in the whole range that the engine is operable together with the recirculation of the exhaust.

Internal combustion engine system, control method thereof, and vehicle

The engine misfire detection process of the invention sets a first threshold value and second threshold values to be referred to for detection of an engine misfire and detects an engine misfire based on the settings of the first threshold value and the second threshold values and 360-degree differences. The engine misfire detection process of the invention detects the occurrence of an engine misfire at each gear position of the transmission by taking into account the varying effects of the operating conditions of a motor the transmission, and a planetary gear mechanism on the crankshaft of the engine.

Engine misfire detection apparatus, hybrid vehicle equipped with the same, and engine misfire detection method

Engine misfire is detected by using threshold values that vary depending on whether damping control is executed. First threshold values are adopted at the setting of a gearshift position to a drive position or a park position where damping control is performed to reduce the vibration of an engine. Second threshold values are adopted at the setting of the gearshift position to a neutral position where the damping control is not performed, the second threshold values being greater than the first threshold values. Engine misfire detection is carried out by processing using the first and second threshold values.

An ECU executes a program including steps of estimating an oil temperature based on a water temperature sensed by a water temperature sensor, setting NE() to a lower limit value of an engine revolution speed NE when the oil temperature is equal to or higher than a threshold THO(), setting NE() (NE()&#x3c;NE()) to the lower limit value of engine revolution speed NE when the oil temperature is lower than the threshold THO(), and controlling an engine driving an oil pump to keep the engine revolution speed NE equal to or higher than the set lower limit value.

Control device and control method of internal combustion engine

Upon incompletion of abnormality detection of an air-fuel ratio sensor provided in an exhaust pipe of an engine during operation of the engine (steps Sand S), when the state of charge SOC of a battery is lower than a preset reference charge level Sref or when the accelerator opening Acc is not less than a preset reference opening Aref (steps Sand S), the abnormality detection is not performed (step S). When the state of charge SOC of the battery is not lower than the preset reference charge level Sref and when the accelerator opening Acc is less than the preset reference opening Aref (steps Sand S), the abnormality detection is performed to identify abnormality or normality of the air-fuel ratio sensor based on an air fuel ratio AF output from the air-fuel ratio sensor (steps Sto S). The drive control cuts off a fuel supply to the engine, controls a motor to enable motoring of the engine, and ensures output of a torque demand to a driveshaft, while the abnormality detection is performed.

Power output apparatus, vehicle equipped with power output apparatus, and control method of power output apparatus

In the case of non-execution of catalyst warm-up acceleration control, the engine misfire detection procedure compares a 30-degree rotation time computed as a time required for a 30-degree rotation of an engine crankshaft with preset reference values Trefand Trefand distinctly detects the occurrence of intermittent engine misfires and the occurrence of either a single engine misfire or consecutive engine misfires (steps Sto S). In the case of execution of the catalyst warm-up acceleration control, the engine misfire detection procedure compares the 30-degree rotation time computed as the time required for a 30-degree rotation of the engine crankshaft with preset reference values Trefand Trefand distinctly detects the occurrence of the consecutive engine misfires and the occurrence of either the single engine misfire or the intermittent engine misfires (steps Sto S). This arrangement ensures accurate detection and identification of engine misfires, regardless of execution or non-execution of the catalyst warm-up acceleration control.

The engine misfire detection apparatus of the invention successively determines whether a rotational fluctuation difference Nxdas a difference between a rotational fluctuation Nxd at a certain crank angle CA of an engine and a rotational fluctuation Nxd at a 360 degree-prior crank angle CA exceeds a predetermined reference value A(step S) and whether a rotational fluctuation difference Nxdas a difference between the rotational fluctuation Nxd at the certain crank angle CA and a rotational fluctuation Nxd at a 720 degree-prior crank angle CA exceeds a predetermined reference value B(step S). The engine misfire detection apparatus detects a misfire of the engine upon satisfaction of all conditions regarding rotational fluctuation difference proportions Nja, Nja, and Njaon the basis of the rotational fluctuation difference Nxd(step S) and all conditions regarding rotational fluctuation difference proportions Njb, Njb, and Njbon the basis of the rotational fluctuation difference Nxd(step S), when both the rotational fluctuation differences Nxdand Nxdexceed the respective reference values Aand B(steps Sand S). This arrangement ensures adequate and accurate detection of an engine misfire during warm-up of a catalyst included in an exhaust emission control unit with a significant delay of the ignition timing in the engine.

A rotational fluctuation is given as a variation in rotation speed of a crankshaft at every specific crank angle, that is, at every 120 degrees, corresponding to an ignition timing in each cylinder of a six-cylinder engine. The engine misfire identification technique of the invention calculates a difference between a specific rotational fluctuation at a specific crank angle and a previous rotational fluctuation at a crank angle of 360 degrees before the specific crank angle as a rotational fluctuation difference, and sums up the specific rotational fluctuation at the specific crank angle and the previous rotational fluctuation at the crank angle of 360 degrees before the specific crank angle to give a total rotational fluctuation. The engine misfire identification technique successively adopts a single misfire judgment logic, a consecutive misfire judgment logic, and an intermittent misfire judgment logic to discriminate among a single misfire pattern, a consecutive misfire pattern, and an intermittent misfire pattern and distinctly and accurately identify misfires in the engine, based on the calculated rotational fluctuation, rotational fluctuation difference, and total rotational fluctuation.

Growing community of inventors

Aichi-ken, Japan

Hikokazu Akimoto