A control unit of a hybrid vehicle derives maximum assisting electric power and maximum chargeable electric power of a battery, and permits a shift to an engine direct coupled drive in the event that an imaginary operation point of an internal combustion engine where the maximum assisting electric p
A control unit of a hybrid vehicle derives maximum assisting electric power and maximum chargeable electric power of a battery, and permits a shift to an engine direct coupled drive in the event that an imaginary operation point of an internal combustion engine where the maximum assisting electric power is supplied to a motor and an imaginary operation point of the internal combustion engine where the maximum chargeable electric power is stored in the battery, at a rotational speed of the internal combustion engine which corresponds to a required driving force required on the hybrid vehicle when the hybrid vehicle executes the engine direct coupled drive, are positioned inside an area where energy efficiency of the hybrid vehicle becomes higher when the hybrid vehicle executes the engine direct coupled drive than when the hybrid vehicle executes a series drive.
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1. A hybrid vehicle, comprising: an internal combustion engine;a generator which is driven by the internal combustion engine to generate electric power;a battery which supplies electric power to a motor;the motor which is connected to drive wheels and which is driven by electric power supplied from
1. A hybrid vehicle, comprising: an internal combustion engine;a generator which is driven by the internal combustion engine to generate electric power;a battery which supplies electric power to a motor;the motor which is connected to drive wheels and which is driven by electric power supplied from at least one of the battery and the generator; anda power transmission engaging/disengaging portion which is disposed between the generator and the drive wheels so as to engage or disengage a power transmission path from the internal combustion engine to the drive wheels via the generator,wherein the hybrid vehicle is driven by power from at least one of the motor and the internal combustion engine, andthe hybrid vehicle comprises a control unit for determining whether the hybrid vehicle executes a series drive in which the motor which is driven by electric power generated by the generator based on power of the internal combustion engine is used as a drive source with the power transmission engaging/disengaging portion released, or executes an engine direct coupled drive in which at least the internal combustion engine is used as a drive source with the power transmission engaging/disengaging portion applied,the control unit comprises:a required driving force calculating section for calculating a driving force required on the hybrid vehicle based on an accelerator pedal opening which corresponds to an accelerator pedal operation in the hybrid vehicle and a driving speed of the hybrid vehicle;a maximum assisting electric power deriving section for deriving maximum assisting electric power which is a largest output that the battery enables to output, based on a state of the battery;a maximum chargeable electric power deriving section for deriving maximum chargeable electric power, which is the electric power derived from a voltage and a current which are supplied to the battery at a maximum when the battery is charged, based on a state of the battery; andan engine direct coupled drive shifting determination section for permitting a shift from the series drive to the engine direct coupled drive in an event,when an output of the internal combustion engine driven at an operation point which lies close to a most efficient operation is smaller than the required driving force, and a first imaginary operation point of the internal combustion engine, in a case that the maximum assisting electric power is supplied to the motor, is lower than an upper limit torque of an engine direct coupling efficiency enhancing area at a rotational speed of the internal combustion engine which corresponds to the required driving force, andwhen an output of the internal combustion engine driven at an operation point which lies close to the most efficient operation point is larger than the required driving force, and a second imaginary operation point of the internal combustion engine, in a case that the maximum chargeable electric power is charged in the battery, is higher than a lower limit torque of the engine direct coupling efficiency enhancing area at a rotational speed of the internal combustion engine which corresponds to the required driving force,wherein the engine direct coupling efficiency enhancing area is an area surrounded by the upper limit torque according to assisting electric power that enables to be outputted from the battery when the hybrid vehicle is driven in the engine direct coupled drive mode, and the lower limit torque according to electric power that enables to be stored in the battery when the hybrid vehicle is driven in the engine direct coupled drive mode. 2. The hybrid vehicle according to claim 1, wherein the engine direct coupled drive shifting determination section determines to cancel the engine direct coupled drive in an event,when an output of the internal combustion engine driven at an operation point which lies close to the most efficient operation point is smaller than the required driving force, and a third imaginary operation point of the internal combustion engine, in a case that the maximum assisting electric power is supplied to the motor, is higher than the upper limit torque of the engine direct coupling efficiency enhancing area at a rotational speed of the internal combustion engine which corresponds to the required driving force, orwhen an output of the internal combustion engine driven at an operation point which lies close to the most efficient operation point is larger than the required driving force, and a fourth imaginary operation point of the internal combustion engine, in a case that the maximum chargeable electric power is charged in the battery, is lower than the lower limit torque of the engine direct coupling efficiency enhancing area at a rotational speed of the internal combustion engine which corresponds to the required driving force. 3. The hybrid vehicle according to claim 1, wherein the engine direct coupled drive shifting determination section prohibits a shift from the series drive to the engine direct coupled drive in an event that electric power required for the hybrid vehicle to shift to the engine direct coupled drive is outside a range of chargeable or dischargeable electric power of the battery. 4. The hybrid vehicle according to claim 1, wherein when the power transmission engaging/disengaging portion is engaged, an output of the internal combustion engine is converted as mechanical energy at a specific gear ratio based on a single-speed fixed gear to be transmitted to the drive wheels. 5. A control method of a hybrid vehicle comprising: an internal combustion engine;a generator which is driven by the internal combustion engine to generate electric power;a battery which supplies electric power to a motor;the motor which is connected to drive wheels and which is driven by electric power supplied from at least one of the battery and the generator; anda power transmission engaging/disengaging portion which is disposed between the generator and the drive wheels so as to engage or disengage a power transmission path from the internal combustion engine to the drive wheels via the generator,wherein the hybrid vehicle is driven by power from at least one of the motor and the internal combustion engine, andthe hybrid vehicle comprises a control unit for determining whether the hybrid vehicle executes a series drive in which the motor which is driven by electric power generated by the generator based on power of the internal combustion engine is used as a drive source with the power transmission engaging/disengaging portion released, or executes an engine direct coupled drive in which at least the internal combustion engine is used as a drive source with the power transmission engaging/disengaging portion applied,the control unit comprises the steps of:calculating a driving force required on the hybrid vehicle based on an accelerator pedal opening which corresponds to an accelerator pedal operation in the hybrid vehicle and a driving speed of the hybrid vehicle,deriving maximum assisting electric power which is a largest output that the battery enables to output, based on a state of the battery,deriving maximum chargeable electric power of the battery based on a state of the battery, andpermitting a shift from the series drive to the engine direct coupled drive in an event,when an output of the internal combustion engine driven at an operation point which lies close to a most efficient operation is smaller than the required driving force, and a first imaginary operation point of the internal combustion engine, in a case that the maximum assisting electric power is supplied to the motor, is lower than an upper limit torque of an engine direct coupling efficiency enhancing area at a rotational speed of the internal combustion engine which corresponds to the required driving force, andwhen an output of the internal combustion engine driven at an operation point which lies close to the most efficient operation point is larger than the required driving force, and a second imaginary operation point of the internal combustion engine, in a case that the maximum chargeable electric power is charged in the battery, is higher than a lower limit torque of the engine direct coupling efficiency enhancing area at a rotational speed of the internal combustion engine which corresponds to the required driving force,wherein the engine direct coupling efficiency enhancing area is an area surrounded by the upper limit torque according to assisting electric power that enables to be outputted from the battery when the hybrid vehicle is driven in the engine direct coupled drive mode, and the lower limit torque according to electric power that enables to be stored in the battery when the hybrid vehicle is driven in the engine direct coupled drive mode. 6. The control method according to claim 5, wherein when the power transmission engaging/disengaging portion is engaged, an output of the internal combustion engine is converted as mechanical energy at a specific gear ratio based on a single-speed fixed gear to be transmitted to the drive wheels.
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