Hybrid vehicle and control method thereof
First Claim
1. A hybrid vehicle, comprising:
- an internal combustion engine;
a catalytic converter including a catalyst for purification of an exhaust gas emitted from the internal combustion engine;
an electric power-mechanical power input output assembly connected with a first axle as one of axles of the hybrid vehicle and with an output shaft of the internal combustion engine and configured to input and output power from and to the first axle and the output shaft through input and output of electric power and mechanical power;
a motor configured to input and output power from and to either the first axle or a second axle different from the first axle;
an accumulator configured to transmit electric power to and from the electric power-mechanical power input output assembly and the motor;
an allowable charging power setting module configured to set an allowable charging power to charge the accumulator based on a state of the accumulator;
a fuel cutoff determination module configured to determine prohibition or permission for cutoff of fuel supply to the internal combustion engine, based on the set allowable charging power;
an operating condition setting module configured to set an object operating condition selected among multiple operating conditions that define different specifications of a driving force restriction of setting a driving force demand required for driving and a drive point restriction of setting a target drive point of the internal combustion engine corresponding to the set driving force demand;
a driving force-drive point setting module configured to set the driving force demand and the target drive point of the internal combustion engine based on the selected object operating condition;
a fuel increase relation setting module configured to set a fuel increase relation based on the selected object operating condition, the fuel increase relation representing a relation between the allowable charging power and an increase restriction of a fuel supply amount to the internal combustion engine for temperature regulation of the catalyst; and
a controller configured to control the internal combustion engine, the electric power-mechanical power input output assembly, and the motor to drive the internal combustion engine at the set target drive point with an increase of the fuel supply amount according to the increase restriction defined by the set allowable charging power and the set fuel increase relation in response to a result of the determination by the fuel cutoff determination module and to ensure output of a driving force based on the set driving force demand.
1 Assignment
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Accused Products
Abstract
A hybrid vehicle 20 sets a tentative limit value Win0 of determining a fuel increase relation with respect to a selected gearshift position SP for driving (S220, S230, S350), and performs increasing correction of a fuel injection amount according to either a first OT increase factor setting map or a second OT increase factor setting map that is enabled based on a relation of an input limit Win of the battery 50 to the tentative limit value Win0. Prohibition of fuel cutoff may be cancelled, based on a relation of the input limit Win to a driving force demand in an accelerator-off state set at the selected gearshift position SP. Even in this case, the increasing correction enables temperature regulation of an exhaust gas purification catalyst, with a view to controlling deterioration of the exhaust gas purification catalyst in an actual fuel cutoff condition after cancellation of the prohibition of the fuel cutoff. The deterioration of the exhaust gas purification catalyst is thus favorably controlled, irrespective of the selected gearshift position SP.
30 Citations
13 Claims
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1. A hybrid vehicle, comprising:
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an internal combustion engine; a catalytic converter including a catalyst for purification of an exhaust gas emitted from the internal combustion engine; an electric power-mechanical power input output assembly connected with a first axle as one of axles of the hybrid vehicle and with an output shaft of the internal combustion engine and configured to input and output power from and to the first axle and the output shaft through input and output of electric power and mechanical power; a motor configured to input and output power from and to either the first axle or a second axle different from the first axle; an accumulator configured to transmit electric power to and from the electric power-mechanical power input output assembly and the motor; an allowable charging power setting module configured to set an allowable charging power to charge the accumulator based on a state of the accumulator; a fuel cutoff determination module configured to determine prohibition or permission for cutoff of fuel supply to the internal combustion engine, based on the set allowable charging power; an operating condition setting module configured to set an object operating condition selected among multiple operating conditions that define different specifications of a driving force restriction of setting a driving force demand required for driving and a drive point restriction of setting a target drive point of the internal combustion engine corresponding to the set driving force demand; a driving force-drive point setting module configured to set the driving force demand and the target drive point of the internal combustion engine based on the selected object operating condition; a fuel increase relation setting module configured to set a fuel increase relation based on the selected object operating condition, the fuel increase relation representing a relation between the allowable charging power and an increase restriction of a fuel supply amount to the internal combustion engine for temperature regulation of the catalyst; and a controller configured to control the internal combustion engine, the electric power-mechanical power input output assembly, and the motor to drive the internal combustion engine at the set target drive point with an increase of the fuel supply amount according to the increase restriction defined by the set allowable charging power and the set fuel increase relation in response to a result of the determination by the fuel cutoff determination module and to ensure output of a driving force based on the set driving force demand. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A control method of a hybrid vehicle, the hybrid vehicle including:
- an internal combustion engine;
a catalytic converter including a catalyst for purification of an exhaust gas emitted from the internal combustion engine;
an electric power-mechanical power input output assembly connected with a first axle as one of axles of the hybrid vehicle and with an output shaft of the internal combustion engine and configured to input and output power from and to the first axle and the output shaft through input and output of electric power and mechanical power;
a motor configured to input and output power from and to either the first axle or a second axle different from the first axle;
an accumulator configured to transmit electric power to and from the electric power-mechanical power input output assembly and the motor; and
an operating condition setting module configured to set an object operating condition selected among multiple operating conditions that define different specifications of a driving force restriction of setting a driving force demand required for driving and a drive point restriction of setting a target drive point of the internal combustion engine corresponding to the set driving force demand, the control method comprising the steps of;(a) setting an allowable charging power to charge the accumulator based on a state of the accumulator; (b) determining prohibition or permission for cutoff of fuel supply to the internal combustion engine, based on the set allowable charging power; (c) setting a fuel increase relation based on the selected object operating condition, the fuel increase relation representing a relation between the allowable charging power and an increase restriction of a fuel supply amount to the internal combustion engine for temperature regulation of the catalyst; and (d) controlling the internal combustion engine, the electric power-mechanical power input output assembly, and the motor to drive the internal combustion engine at a target drive point, which is set based on the drive point restriction of the object operating condition, with an increase of the fuel supply amount according to the increase restriction defined by the allowable charging power and the fuel increase relation in response to a result of the determination in the step (b) and to ensure output of a driving force based on a driving force demand, which is set based on the driving force restriction of the object operating condition. - View Dependent Claims (9, 10, 11, 12, 13)
- an internal combustion engine;
Specification