Hybrid vehicle and control method of hybrid vehicle
First Claim
1. A hybrid vehicle, comprising:
- an internal combustion engine that outputs power to a driveshaft linked to an axle via a gear mechanism;
a motor that inputs and outputs power from and to the driveshaft;
an electric power-mechanical power input output mechanism that is connected to an output shaft of the internal combustion engine and to the driveshaft and outputs at least part of the output power of the internal combustion engine to the driveshaft through input and output of electric power and mechanical power;
an accumulator unit that is capable of inputting and outputting electric power from and to the motor and the electric power-mechanical power input output mechanism;
a driving force demand setting module that sets a driving force demand to be output to the driveshaft;
a stop-start requirement module that gives a stop request of the internal combustion engine upon satisfaction of a preset operation stop condition and gives a start request of the internal combustion engine upon satisfaction of a preset operation start condition; and
a control module that, on condition that the driving force demand is not lower than a preset reference driving force, controls the internal combustion engine, the electric power-mechanical power input output mechanism, and the motor to stop operation of the internal combustion engine and to ensure output of a driving force equivalent to the driving force demand to the driveshaft, in response to the stop request of the internal combustion engine given by said stop-start requirement module,on condition that the driving force demand is lower than the preset reference driving force, said control module controlling the internal combustion engine, the electric power-mechanical power input output mechanism, and the motor to keep the internal combustion engine in an operating state and to ensure output of the driving force equivalent to the driving force demand to the driveshaft, regardless of the stop request of the internal combustion engine.
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Accused Products
Abstract
In a hybrid vehicle equipped with an engine and a motor that are connected to a driveshaft linked to an axle via a gear mechanism, on condition that a torque demand Tr* required for the driveshaft is lower than a preset reference torque level Tref (step S220) and that a vehicle speed V is lower than a preset reference speed level Vref (step S230), the drive control of the invention idles the engine (step S240) regardless of a stop request of the engine (steps S120 and S210). This arrangement effectively reduces the potential for backlash or gear rattle in the gear mechanism. On condition that the vehicle speed V is not lower than the preset reference speed level Vref (step S220), on the other hand, the drive control of the invention stops the operation of the engine (step S250) in response to the stop request of the engine (steps S120 and S210) even under the torque demand Tr* of lower than the preset reference torque level Tref (step S230). This arrangement desirably enhances the energy efficiency of the hybrid vehicle.
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Citations
13 Claims
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1. A hybrid vehicle, comprising:
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an internal combustion engine that outputs power to a driveshaft linked to an axle via a gear mechanism; a motor that inputs and outputs power from and to the driveshaft; an electric power-mechanical power input output mechanism that is connected to an output shaft of the internal combustion engine and to the driveshaft and outputs at least part of the output power of the internal combustion engine to the driveshaft through input and output of electric power and mechanical power; an accumulator unit that is capable of inputting and outputting electric power from and to the motor and the electric power-mechanical power input output mechanism; a driving force demand setting module that sets a driving force demand to be output to the driveshaft; a stop-start requirement module that gives a stop request of the internal combustion engine upon satisfaction of a preset operation stop condition and gives a start request of the internal combustion engine upon satisfaction of a preset operation start condition; and a control module that, on condition that the driving force demand is not lower than a preset reference driving force, controls the internal combustion engine, the electric power-mechanical power input output mechanism, and the motor to stop operation of the internal combustion engine and to ensure output of a driving force equivalent to the driving force demand to the driveshaft, in response to the stop request of the internal combustion engine given by said stop-start requirement module, on condition that the driving force demand is lower than the preset reference driving force, said control module controlling the internal combustion engine, the electric power-mechanical power input output mechanism, and the motor to keep the internal combustion engine in an operating state and to ensure output of the driving force equivalent to the driving force demand to the driveshaft, regardless of the stop request of the internal combustion engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A control method of a hybrid vehicle, said hybrid vehicle comprising:
- an internal combustion engine;
an electric power-mechanical power input output mechanism that is connected to an output shaft of the internal combustion engine and to a driveshaft linked to an axle via a gear mechanism and outputs at least part of the output power of the internal combustion engine to the driveshaft through input and output of electric power and mechanical power;
a motor that inputs and outputs power from and to the driveshaft; and
an accumulator unit that is capable of inputting and outputting electric power from and to the motor and the electric power-mechanical power input output mechanism,on condition that a driving force demand required for the driveshaft is not lower than a preset reference driving force, said control method controlling the internal combustion engine, the electric power-mechanical power input output mechanism, and the motor to stop operation of the internal combustion engine and to ensure output of a driving force equivalent to the driving force demand to the driveshaft, in response to a stop request of the internal combustion engine given upon satisfaction of a preset operation stop condition, on condition that the driving force demand is lower than the preset reference driving force, said control method controlling the internal combustion engine, the electric power-mechanical power input output mechanism, and the motor to keep the internal combustion engine in an operating state and to ensure output of the driving force equivalent to the driving force demand to the driveshaft, regardless of the stop request of the internal combustion engine. - View Dependent Claims (10, 11, 12, 13)
- an internal combustion engine;
Specification