Power Output Apparatus, Motor Vehicle Equipped with Power Output Apparatus, and Control Method of Power Output Apparatus
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Abstract
When the current input and output charge levels of a battery are out of allowable input and output ranges, the drive control of the invention uses an operation curve under battery restriction, which sets the higher rotation speed in a low power range and has a smaller variation in rotation speed against a variation of output power than an operation curve in the ordinary state, to set a target rotation speed Ne* and a target torque Te* of an engine and controls the engine and motors MG1 and MG2. Application of this operation curve under battery restriction enhances the response of the engine to a variation of engine power demand Pe* and decreases a potential insufficiency of power due to a delayed response of the engine. The battery can thus input and output a required electric power within the ranges of an input limit Win and an output limit Wout to ensure supply of the insufficient power from the motor MG2. This control enables smooth output of a required power to a driveshaft.
22 Citations
20 Claims
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1-10. -10. (canceled)
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11. A power output apparatus that outputs power to a driveshaft, said power output apparatus comprising:
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an internal combustion engine that has an output shaft and generates power;
a power transmission mechanism that is connected with the output shaft of the internal combustion engine and with the driveshaft and transmits at least part of the power of the internal combustion engine to the driveshaft;
a motor that is capable of inputting and outputting power from and to the driveshaft;
an accumulator that transmits electric power to and from the motor; and
a control device comprising a power demand setting module, a target drive point setting module, and a drive control module, said power demand setting module setting a power demand to be output to the driveshaft, said target drive point setting module setting a target drive point of the internal combustion engine based on a first restriction and the set power demand when a condition of the accumulator is within allowable input and output ranges that depend on rated values of the accumulator, while setting the target drive point of the internal combustion engine based on the set power demand and a second restriction having a smaller variation in rotation speed against a power change than the first restriction when the condition of the accumulator is out of the allowable input and output ranges, said drive control module controlling the internal combustion engine, the power transmission mechanism, and the motor to drive the internal combustion engine at the set target drive point and to output a power equivalent to the set power demand to the driveshaft. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A motor vehicle that is equipped with a power output apparatus and has an axle mechanically linked with a driveshaft, said motor vehicle comprising:
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an internal combustion engine that has an output shaft and generates power;
a power transmission mechanism that is connected with the output shaft of the internal combustion engine and with the driveshaft and transmits at least part of the power of the internal combustion engine to the driveshaft;
a motor that is capable of inputting and outputting power from and to the driveshaft;
an accumulator that transmits electric power to and from the motor; and
a control device comprising a power demand setting module, a target drive point setting module, and a drive control module, said power demand setting module setting a power demand to be output to the driveshaft, said target drive point setting module setting a target drive point of the internal combustion engine based on a first restriction and the set power demand when a condition of the accumulator is within allowable input and output ranges that depend on rated values of the accumulator, while setting the target drive point of the internal combustion engine based on the set power demand and a second restriction having a smaller variation in rotation speed against a power change than the first restriction when the condition of the accumulator is out of the allowable input and output ranges, said drive control module controlling the internal combustion engine, the power transmission mechanism, and the motor to drive the internal combustion engine at the set target drive point and to output a power equivalent to the set power demand to the driveshaft.
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20. A control method of a power output apparatus, said power output apparatus comprising:
- an internal combustion engine that has an output shaft and generates power;
a power transmission mechanism that is connected with the output shaft of the internal combustion engine and with the driveshaft and transmits at least part of the power of the internal combustion engine to the driveshaft;
a motor that is capable of inputting and outputting power from and to the driveshaft;
an accumulator that transmits electric power to and from the motor,said control method comprising the steps of;
(a) setting a power demand to be output to the driveshaft, (b) setting a target drive point of the internal combustion engine based on a first restriction and the set power demand when a condition of the accumulator is within allowable input and output ranges that depend on rated values of the accumulator, while setting the target drive point of the internal combustion engine based on the set power demand and a second restriction having a smaller variation in rotation speed against a power change than the first restriction when the condition of the accumulator is out of the allowable input and output ranges, and (c) controlling the internal combustion engine, the power transmission mechanism, and the motor to drive the internal combustion engine at the set target drive point and to output a power equivalent to the set power demand to the driveshaft.
- an internal combustion engine that has an output shaft and generates power;
Specification