Power output apparatus, motor vehicle equipped with power output apparatus, and control method of power output apparatus
First Claim
1. A power output apparatus that outputs power to a driveshaft, the power output apparatus comprising:
- an internal combustion engine that has an output shaft and outputs power, the internal combustion engine being equipped with a catalytic conversion unit that uses a catalyst for catalytic conversion of an exhaust gas or emission from the internal combustion engine;
an electric power-mechanical power input output mechanism that receives as input, and also outputs, electric power and mechanical power, the electric power-mechanical power input output mechanism is connected with the output shaft of the internal combustion engine and with the driveshaft and outputs at least part of the output power of the internal combustion engine to the driveshaft;
a motor that inputs and outputs power from and to the driveshaft;
an accumulator unit that transmits electric power to and from both the electric power-mechanical power input output mechanism and the motor;
a driving force demand setting unit that sets a driving force demand to be output to the driveshaft;
a target operation state setting module that enables intermittent operation of the internal combustion engine when it is determined that the internal combustion engine does not need to continuously operate and sets a target operation state of the internal combustion engine based on the set driving force demand, and continuously keeps operation of the internal combustion engine when it is determined that the internal combustion engine needs to continuously operate and sets the target operation state of the internal combustion engine based on the set driving force demand; and
a control module in operative communication with an accelerator movable between a depressed position and a released position, the control module, when required to output either a braking force or a light load to the drive shaft while the accelerator is in the released position, effects control such that;
regardless of whether it is determined that the internal combustion engine needs to continuously operate or does not need to continuously operate, the control module controls the internal combustion engine to continuously operate to effect catalyst degradation control to reduce degradation of the catalyst used by the catalytic conversion unit;
in a circumstance where it is determined that the internal combustion engine does not need to continuously operate, the control module controls the internal combustion engine, the electric power-mechanical power input output mechanism, and the motor to drive the internal combustion engine in the set target operation state to ensure output of a driving force equivalent to the set driving force demand to the driveshaft; and
in a circumstance where it is determined that the internal combustion engine needs to continuously operate, the control module controls the internal combustion engine, the electric power-mechanical power input output mechanism, and the motor to make an operating status of the internal combustion engine approach the set target operation state while continuing the explosive combustion of the fuel in the internal combustion engine with satisfaction of a predetermined routine for efficient operation of the internal combustion engine and lowering of rotation speed of the internal combustion engine to ensure output of the driving force equivalent to the set driving force demand to the driveshaft.
1 Assignment
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Accused Products
Abstract
In requirement of catalyst degradation control with setting of a catalyst degradation control flag Fc to 1, the braking control of the invention sets torque commands Tm1* and Tm2* of two motors and controls the operations of an engine and the two motors to shift a drive point of the engine on an optimum fuel consumption operation curve by a preset rotation speed variation Nrt1 in a specific range of rotation speed that ensures no occurrence of a misfire in the engine within an input limit Win of a battery and to ensure output of a braking torque demand Tr* to a ring gear shaft or driveshaft (steps S200 to S250). Such braking control stably lowers a rotation speed Ne of the engine to a target rotation speed Ne* and desirably enhances the fuel consumption under the catalyst degradation control.
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Citations
17 Claims
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1. A power output apparatus that outputs power to a driveshaft, the power output apparatus comprising:
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an internal combustion engine that has an output shaft and outputs power, the internal combustion engine being equipped with a catalytic conversion unit that uses a catalyst for catalytic conversion of an exhaust gas or emission from the internal combustion engine; an electric power-mechanical power input output mechanism that receives as input, and also outputs, electric power and mechanical power, the electric power-mechanical power input output mechanism is connected with the output shaft of the internal combustion engine and with the driveshaft and outputs at least part of the output power of the internal combustion engine to the driveshaft; a motor that inputs and outputs power from and to the driveshaft; an accumulator unit that transmits electric power to and from both the electric power-mechanical power input output mechanism and the motor; a driving force demand setting unit that sets a driving force demand to be output to the driveshaft; a target operation state setting module that enables intermittent operation of the internal combustion engine when it is determined that the internal combustion engine does not need to continuously operate and sets a target operation state of the internal combustion engine based on the set driving force demand, and continuously keeps operation of the internal combustion engine when it is determined that the internal combustion engine needs to continuously operate and sets the target operation state of the internal combustion engine based on the set driving force demand; and a control module in operative communication with an accelerator movable between a depressed position and a released position, the control module, when required to output either a braking force or a light load to the drive shaft while the accelerator is in the released position, effects control such that; regardless of whether it is determined that the internal combustion engine needs to continuously operate or does not need to continuously operate, the control module controls the internal combustion engine to continuously operate to effect catalyst degradation control to reduce degradation of the catalyst used by the catalytic conversion unit; in a circumstance where it is determined that the internal combustion engine does not need to continuously operate, the control module controls the internal combustion engine, the electric power-mechanical power input output mechanism, and the motor to drive the internal combustion engine in the set target operation state to ensure output of a driving force equivalent to the set driving force demand to the driveshaft; and in a circumstance where it is determined that the internal combustion engine needs to continuously operate, the control module controls the internal combustion engine, the electric power-mechanical power input output mechanism, and the motor to make an operating status of the internal combustion engine approach the set target operation state while continuing the explosive combustion of the fuel in the internal combustion engine with satisfaction of a predetermined routine for efficient operation of the internal combustion engine and lowering of rotation speed of the internal combustion engine to ensure output of the driving force equivalent to the set driving force demand to the driveshaft. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A vehicle, comprising:
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an internal combustion engine that has an output shaft and outputs power, the internal combustion engine being equipped with a catalytic conversion unit that uses a catalyst for catalytic conversion of an exhaust gas or emission from the internal combustion engine; an electric power-mechanical power input output mechanism that receives as input, and also outputs, electric power and mechanical power, the electric power-mechanical power input output mechanism is connected with the output shaft of the internal combustion engine and with a first axle and outputs at least part of the output power of the internal combustion engine to a driveshaft; a motor that inputs and outputs power from and to the first axle or a second axle different from the first axle; an accumulator unit that transmits electric power to and from both the electric power-mechanical power input output mechanism and the motor; a driving force demand setting unit that sets a driving force demand required for a drive of the vehicle; a target operation state setting module that enables intermittent operation of the internal combustion engine when it is determined that the internal combustion engine does not need to continuously operate and sets a target operation state of the internal combustion engine based on the set driving force demand, and continuously keeps operation of the internal combustion engine when it is determined that the internal combustion engine needs to continuously operate and sets the target operation state of the internal combustion engine based on the set driving force demand; an accelerator movable between a depressed position and a released position; and a control module in operative communication with the accelerator and that, when required to output either a braking force or a light load to the drive shaft while the accelerator is in the released position, effects control such that; regardless of whether it is determined that the internal combustion engine needs to continuously operate or does not need to continuously operate, the control module controls the internal combustion engine to continuously operate to effect catalyst degradation control to reduce degradation of the catalyst used by the catalytic conversion unit; in a circumstance where it is determined that the internal combustion engine does not need to continuously operate, the control module controls the internal combustion engine, the electric power-mechanical power input output mechanism, and the motor to drive the internal combustion engine in the set target operation state to ensure output of a driving force equivalent to the set driving force demand to the vehicle; and in a circumstance where it is determined that the internal combustion engine needs to continuously operate, the control module controls the internal combustion engine, the electric power-mechanical power input output mechanism, and the motor to make an operating status of the internal combustion engine approach the set target operation state while continuing the explosive combustion of the fuel in the internal combustion engine with satisfaction of a predetermined routine for efficient operation of the internal combustion engine and lowering of rotation speed of the internal combustion engine to ensure output of the driving force equivalent to the set driving force demand to the vehicle. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A control method of a power output apparatus, the power output apparatus comprising:
- an internal combustion engine that has an output shaft and outputs power, the internal combustion engine being equipped with a catalytic conversion unit that uses a catalyst for catalytic conversion of an exhaust gas or emission from the internal combustion engine;
an electric power-mechanical power input output mechanism that receives as input, and also outputs, electric power and mechanical power, the electric power-mechanical power input output mechanism is connected with the output shaft of the internal combustion engine and with a driveshaft and outputs at least part of the output power of the internal combustion engine to the driveshaft;
a motor that inputs and outputs power from and to the driveshaft;
an accumulator unit that transmits electric power to and from both the electric power-mechanical power input output mechanism and the motor;
the control method of the power output apparatus comprising the steps of;(a) enabling intermittent operation of the internal combustion engine when it is determined that the internal combustion engine does not need to continuously operate and setting a target operation state of the internal combustion engine based on the driving force demand to be output to the driveshaft, and continuously keeping operation of the internal combustion engine when it is determined that the internal combustion engine needs to continuously operate and setting the target operation state of the internal combustion engine based on the driving force demand; (b) when required to output either a braking force or a light load to the drive shaft while an accelerator is in a released position, and it is determined that the internal combustion engine does not need to continuously operate, controlling the internal combustion engine, the electric power-mechanical power input output mechanism, and the motor to drive the internal combustion engine in the set target operation state to ensure output of a driving force equivalent to driving force demand to the driveshaft, (c) when required to output either a braking force or a light load to the drive shaft while an accelerator is in the released position, and it is determined that the internal combustion engine needs to continuously operate, controlling the internal combustion engine, the electric power-mechanical power input output mechanism, and the motor to make an operating status of the internal combustion engine approach the set target operation state while continuing the explosive combustion of the fuel in the internal combustion engine with satisfaction of a predetermined routine for efficient operation of the internal combustion engine and lowering of rotation speed of the internal combustion engine to ensure output of the driving force equivalent to the driving force demand to the driveshaft; and (d) executing catalyst degradation control, by controlling the combustion in the internal combustion engine while the accelerator is in the released position, regardless of whether it is determined that the internal combustion engine needs to continuously operate or does not need to continuously operate, to reduce degradation of the catalyst used by the catalytic conversion unit, and by inhibiting stopping of combustion in the internal combustion engine to reduce the degradation of the catalyst. - View Dependent Claims (14, 15, 16, 17)
- an internal combustion engine that has an output shaft and outputs power, the internal combustion engine being equipped with a catalytic conversion unit that uses a catalyst for catalytic conversion of an exhaust gas or emission from the internal combustion engine;
Specification