JP2011121482A - Hybrid vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hybrid vehicle that starts an engine at more proper timing and travels. <P>SOLUTION: When an electric travelling mode that prioritizes electric travelling to travel by using an only power outputted from motor 42 is set, the longer an engine stopping time (tstp) when the engine 32 is stopped, the lower speed is set to electric travelling permission speed Vpm (S130). When a vehicle speed V is larger than the electric travelling permission speed Vpm while the engine 32 is being stopped, the engine 32 and motors 41 and 42 are controlled to be travelled with a requested torque by starting the engine 32 (S140, S160). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hybrid vehicle.

  Conventionally, when this type of hybrid vehicle is instructed to run the motor by stopping the operation of the engine and using only the power from the motor, the hybrid vehicle is based on the temperature of the purifier or the coolant temperature of the engine. It is determined whether or not the purification device for purifying the exhaust needs to be warmed up. When it is determined that the purification device needs to be warmed up, the engine is started when the vehicle speed becomes higher than the first vehicle speed, When it is determined that it is not necessary to warm up the purification device, it has been proposed to start the engine when the vehicle speed becomes higher than a second vehicle speed that is higher than the first vehicle speed (see, for example, Patent Document 1). In this hybrid vehicle, by such control, when the purification device needs to be warmed up, the engine is started at a relatively early timing to ensure time for warming up the purification device, and when the purification device does not need to be warmed up. The time during which the motor travels without starting the engine is increased until a relatively late timing.

JP 2009-154701 A

  In such a hybrid vehicle, it is preferable to start the engine at a timing according to the state of the purification device as described above. However, when an abnormality occurs in the temperature sensor that detects the temperature of the purification device or the temperature of cooling water of the engine, In consideration of a case where no sensor is provided, it is preferable to start the engine at a more appropriate timing by a method different from the above method.

  The main purpose of the hybrid vehicle of the present invention is to start and run the engine at a more appropriate timing.

  The hybrid vehicle of the present invention employs the following means in order to achieve the main object described above.

The first hybrid vehicle of the present invention is
An exhaust purification device having a purification catalyst for purifying exhaust gas is attached to an exhaust system so that it can output power for traveling, an electric motor capable of inputting / outputting power for traveling, and exchange of electric power with the motor A battery, a power storage ratio calculating means for calculating a power storage ratio that is a ratio of the power storage amount stored in the battery to the total capacity, and at least the calculated power storage ratio when the system is started is greater than a first predetermined ratio Sometimes, using the power output from the engine and the power input / output from the electric motor until the calculated power storage ratio is less than the second predetermined ratio which is smaller than the first predetermined ratio. The electric travel priority mode that prioritizes the electric travel that travels using only the power input and output from the electric motor as compared to the hybrid travel that travels is referred to as a control mode. A control mode setting means for setting the engine, and when the electric travel priority mode is set as a control mode, the engine is configured to travel with a required torque required for travel in preference to the electric travel over the hybrid travel. And a control means for controlling the electric motor,
When the electric travel priority mode is set as the control mode and the engine is stopped and the vehicle is traveling by the electric drive, the control means becomes smaller as the time during which the engine is stopped is longer. Means for controlling the engine so that when the vehicle speed becomes higher than the set electric travel allowable vehicle speed, the engine is started when an electric travel allowable vehicle speed is set as an upper limit of the vehicle speed region in which the electric travel is permitted. is there,
It is characterized by that.

  In the first hybrid vehicle of the present invention, the vehicle travels using only the power input / output from the electric motor as compared to the hybrid travel using the power output from the engine and the power input / output from the electric motor. When the electric travel priority mode that prioritizes electric travel is set as the control mode, when the engine is stopped and the vehicle is traveling by electric travel, the longer the engine is stopped, the smaller the tendency. In this case, an electric travel allowable vehicle speed as an upper limit of a vehicle speed region in which electric travel is permitted is set, and the engine is controlled so that the engine is started when the vehicle speed exceeds the set electric travel allowable vehicle speed. Even if the purification catalyst is warmed up when the engine was operated last time, if the engine operation is stopped, the temperature of the purification catalyst decreases due to the outside air, so the engine operation is stopped for a long time. It is considered that the temperature of the purification catalyst becomes lower as it becomes. For this reason, by such control, the engine can be started at a more appropriate timing so as to secure a time for warming up the purification catalyst as necessary.

The second hybrid vehicle of the present invention is
An exhaust purification device having a purification catalyst for purifying exhaust gas is attached to an exhaust system so that it can output power for traveling, an electric motor capable of inputting / outputting power for traveling, and exchange of electric power with the motor A battery, a power storage ratio calculating means for calculating a power storage ratio that is a ratio of the power storage amount stored in the battery to the total capacity, and at least the calculated power storage ratio when the system is started is greater than a first predetermined ratio Sometimes, using the power output from the engine and the power input / output from the electric motor until the calculated power storage ratio is less than the second predetermined ratio which is smaller than the first predetermined ratio. The electric travel priority mode that prioritizes the electric travel that travels using only the power input and output from the electric motor as compared to the hybrid travel that travels is referred to as a control mode. Control mode setting means to be set, and when the electric travel priority mode is set as the control mode, the hybrid travel is performed when the vehicle speed is equal to or lower than the electric travel allowable vehicle speed as the upper limit of the vehicle speed range in which the electric travel is permitted. The engine and the electric motor are controlled so as to run at the required torque required for running with priority on the electric running, and when the vehicle speed is greater than the electric running allowable vehicle speed, the request is accompanied with the operation of the engine. In a hybrid vehicle comprising a control means for controlling the engine and the electric motor so as to travel by torque,
The control means is means for controlling the vehicle speed, which is set to decrease as the number of times the engine is started after the system is started, as the electric travel allowable vehicle speed.
It is characterized by that.

  In the second hybrid vehicle of the present invention, the vehicle travels using only the power input / output from the electric motor as compared with the hybrid travel using the power output from the engine and the power input / output from the electric motor. When the electric driving priority mode that prioritizes electric driving is set as the control mode, the vehicle speed tends to become smaller as the number of times the engine is started after the system is started as the upper limit of the vehicle speed range that allows electric driving. When the vehicle speed is less than the set allowable electric traveling speed, the engine and the electric motor are controlled so as to travel with the required torque required for traveling with priority on the electric traveling over the hybrid traveling. The engine and the electric motor are controlled so as to travel with the required torque along with the operation of the engine. In other words, the engine is started when the vehicle speed becomes higher than the electric travel allowable vehicle speed while the operation of the engine is stopped and the vehicle is electrically driven. It is considered that the purification catalyst is sufficiently warmed up as the number of times the engine is started after the system is started. For this reason, by such control, the engine can be started at a more appropriate timing so as to secure a time for warming up the purification catalyst as necessary.

1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 as an embodiment of the present invention. It is a flowchart which shows an example of the electric travel priority control routine performed when the electric travel priority mode is set as a travel mode. It is explanatory drawing which shows an example of the map for electric travel permission vehicle speed setting. It is a flowchart which shows an example of the electric travel priority control routine of a modification. It is explanatory drawing which shows an example of the map for electric travel permission vehicle speed setting of the modification.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a hybrid vehicle 20 as an embodiment of the present invention. As shown in the figure, the hybrid vehicle 20 of the embodiment includes an engine 32 in which an exhaust purification device having a purification catalyst 33 for purifying exhaust is attached to an exhaust pipe, an engine electronic control unit 36 for driving and controlling the engine 32, A planetary gear 38 having a carrier connected to the crankshaft 34 of the engine 32 and a ring gear connected to the drive shaft 22 connected to the drive wheels 26a and 26b via the differential gear 24, and rotating as a synchronous generator motor, for example. A motor 41 whose child is connected to the sun gear of the planetary gear 38, a motor 42 that is configured as a synchronous generator motor and whose rotor is connected to the drive shaft 22, and inverters 43 and 44 for driving the motors 41 and 42, The switching elements (not shown) of the inverters 43 and 44 are switched A motor electronic control unit 46 that drives and controls the motors 41 and 42 by performing the chucking control, a battery 48 that exchanges power with the motors 41 and 42 via the inverters 43 and 44, and a shift position that detects the position of the shift lever. The shift position from the sensor 52, the accelerator opening from the accelerator pedal position sensor 54 that detects the depression amount of the accelerator pedal, the brake position from the brake pedal position sensor 56 that detects the depression amount of the brake pedal, and the vehicle speed from the vehicle speed sensor 58 And a hybrid electronic control unit 50 that inputs V and communicates with the engine electronic control unit 36 and the motor electronic control unit 46 to control the entire vehicle.

  The hybrid vehicle 20 of the embodiment basically travels with intermittent operation of the engine 32 by drive control according to the control mode described below executed by the hybrid electronic control unit 50. Hereinafter, for convenience of explanation, traveling using power output from the engine 32 and power input / output from the motor 42 is referred to as hybrid traveling, and traveling using only power input / output from the motor 42 is electrically driven. That's it. When the power storage rate SOC of the battery 48 when the system is started is equal to or higher than a threshold value Sev (for example, 40%, 50%, etc.) set in advance as a power storage rate SOC that allows a certain amount of electric travel. The electric travel priority mode that prioritizes the electric travel is set as the control mode until the storage ratio SOC reaches a threshold value Shv (for example, 20%, 30%, etc.) set to such an extent that the engine 22 can be sufficiently started. When the power storage ratio SOC when the system is started is less than the threshold Sev or when the power storage ratio SOC when the system is started is equal to or greater than the threshold Sev, the electric drive priority mode is set after the power storage ratio SOC reaches the threshold Shv after that. The hybrid driving priority mode that gives priority to hybrid driving is set as the control mode.Here, the storage ratio SOC of the battery 48 is calculated based on an integrated value of current charged / discharged to / from the battery 48 from a current sensor (not shown). Hereinafter, drive control when the hybrid travel priority mode is set and drive control when the electric travel priority mode is set will be described in order.

  When the hybrid travel priority mode is set as the control mode, the hybrid electronic control unit 50 first performs the travel according to the accelerator opening from the accelerator pedal position sensor 54 and the vehicle speed V from the vehicle speed sensor 58. Driving is performed by setting the required torque required for the drive shaft 22 and multiplying the set required torque by the rotation speed of the drive shaft 22 (for example, the rotation speed obtained by multiplying the rotation speed of the motor 42 or the vehicle speed V by the conversion factor). Calculate the power required for driving. Subsequently, the correction power for charging / discharging the battery 48 obtained according to the storage ratio SOC, which is the ratio of the storage amount stored in the battery 48 to the total capacity from the calculated traveling power (when discharging from the battery 48) Is set to an engine command power as a power to be output from the engine 32. Then, the set engine command power is compared with a start threshold value for starting the engine 32 and a stop threshold value for stopping the operation of the engine 32, and the engine command power is calculated when the operation of the engine 32 is stopped. When the start threshold is exceeded, the engine 32 is started. When the engine command power falls below the stop threshold while the engine 32 is operating, the operation of the engine 32 is stopped. Here, when the hybrid travel priority mode is set, the starting threshold value uses a predetermined power as the power in the vicinity of the lower limit of the power region in which the engine 32 can be efficiently operated, and the stopping threshold value. In this case, a predetermined power is used as a power slightly smaller than the starting threshold value. The starting threshold value and the stopping threshold value when the hybrid driving priority mode is set use values smaller than the starting threshold value and the stopping threshold value when the electric driving priority mode described later is set. To do. When the operation of the engine 32 is continued or after the engine 32 is started, an operation line (for example, fuel efficiency) that can efficiently output the engine command power from the engine 32 and the relationship between the rotational speed of the engine 32 and the torque. The target operating point consisting of the target rotational speed and target torque of the engine 32 is set using the optimal operation line), and within the range of the input / output restriction as the maximum power that can charge and discharge the battery 48, A torque command as a torque to be output from the motor 41 is set by the rotational speed feedback control so that the rotational speed becomes the target rotational speed, and when the motor 41 is driven by the torque command, the drive shaft is connected via the planetary gear 38. Torque obtained by subtracting the torque acting on the motor 22 from the required torque and the torque command of the motor 42 Set Te. The set target rotational speed and target torque of the engine 32 are transmitted to the engine electronic control unit 36, and torque commands for the motors 41 and 42 are transmitted to the motor electronic control unit 46. The engine electronic control unit 36 that has received the target rotational speed and the target torque executes intake air amount control, fuel injection control, ignition control, etc. of the engine 32 so that the engine 32 is operated by the target rotational speed and the target torque. The motor electronic control unit 46 that has received the torque commands of the motors 41 and 42 performs switching control of the switching elements of the inverters 43 and 44 so that the motors 41 and 42 are driven by the torque commands. On the other hand, when the operation stop of the engine 32 is continued or after the operation of the engine 32 is stopped, a value 0 is set in the torque command of the motor 41 and the required torque is set within the range of the input / output limit of the battery 48. 42, and the set torque command for the motors 41 and 42 is transmitted to the motor electronic control unit 46. The motor electronic control unit 46 that has received the torque commands of the motors 41 and 42 performs switching control of the switching elements of the inverters 43 and 44 so that the motors 41 and 42 are driven by the torque commands.

  When the electric travel priority mode is set as the control mode, the hybrid electronic control unit 50 sets the required torque and sets the drive shaft 22 to the set required torque in the same manner as when the hybrid travel mode is set. The travel power required for travel is calculated by multiplying the number of revolutions of. Then, the set traveling power is compared with a starting threshold value for starting the engine and a stopping threshold value for stopping the operation of the engine 32, and the driving power is started when the operation of the engine 32 is stopped. When the engine threshold value is exceeded, the engine 32 is started, and when the engine 32 is operating, when the traveling power falls below the stop threshold value, the operation of the engine 32 is stopped. Here, when the electric travel priority mode is set, the starting threshold value uses the power corresponding to the output limit as the maximum power that may be discharged from the battery 48, and the stopping threshold value is the starting threshold value. A slightly smaller power was used. When the operation of the engine 32 is continued or after the engine 32 is started, the engine command power obtained by subtracting the correction power for charging / discharging the battery 48 from the traveling power and the operation line described above are used. The target operation point is set, and the torque command of the motors 41 and 42 is set so that the engine 32 is driven at the target operation point and travels with the required torque within the range of the input / output restriction of the battery 48. Then, the target rotational speed and target torque of the engine 32 are transmitted to the engine electronic control unit 36, and torque commands for the motors 41 and 42 are transmitted to the motor electronic control unit 46. On the other hand, when the operation stop of the engine 32 is continued or after the operation of the engine 32 is stopped, a value 0 is set to the torque command of the motor 41 and the required torque is set to the torque command of the motor 42 and set. Torque commands for the motors 41 and 42 are transmitted to the motor electronic control unit 46. Since the starting threshold value and the stopping threshold value when the electric driving priority mode is set are larger than the starting threshold value and the stopping threshold value when the hybrid driving priority mode is set, the electric driving priority mode is used. When is set, electric driving is more easily performed than when the hybrid driving priority mode is set.

  Further, in the hybrid vehicle 20 of the embodiment, when the electric travel priority mode is set and the vehicle speed V is high, the vehicle travels with the operation of the engine 32 regardless of the magnitude of the travel power. In consideration of the fact that when the vehicle speed V is high, the power for traveling tends to increase and the output from the engine 32 is likely to be required, it is possible to respond quickly when it is necessary to output the power from the engine 32. At the same time, it is necessary to secure time for warming up the purification catalyst 33 that purifies the exhaust of the engine 32 as necessary. Specifically, the hybrid electronic control unit 50 is reset when the engine 32 is operated and the operation of the engine 32 is stopped, as shown in the electric travel priority control routine of FIG. The engine stop time tstp as the time during which the engine 32 is stopped is counted by counting up (steps S100 to S120), and the upper limit of the vehicle speed region in which the electric travel is permitted based on the engine stop time tstp is counted. The electric travel allowable vehicle speed Vpm is set (step S130), and the set electric travel allowable vehicle speed Vpm is compared with the vehicle speed V from the vehicle speed sensor 58 (step S140). When the vehicle speed V is equal to or lower than the electric travel allowable vehicle speed Vpm, the above-mentioned In this way, the engine 32 is intermittently operated with priority on electric travel. Traveling I (step S150), the vehicle speed V is when the electric running allowable vehicle speed Vpm larger travels with the operation of the engine 32 without regard to the traveling power (step S160). That is, the engine 32 is started when the vehicle speed V becomes higher than the electric travel allowable vehicle speed Vpm while the operation of the engine 32 is stopped. Here, the engine stop time tstp is set to a predetermined long time (for example, several hours) when the engine 32 has not been started once after the vehicle system is started. Further, in the embodiment, the electric travel allowable vehicle speed Vpm is determined in advance by storing the relationship between the engine stop time tstp and the electric travel allowable vehicle speed Vpm as an electric travel allowable vehicle speed setting map, and is given the engine stop time tstp. From the stored map, the electric travel allowable vehicle speed Vpm is derived and set. FIG. 3 shows an example of an electric travel allowable vehicle speed setting map. As shown in the figure, the electric travel allowable vehicle speed Vpm is set to a smaller vehicle speed as the engine stop time tstp is longer. In general, even if the purification catalyst 33 is warmed up when the engine 32 is operated, the temperature of the purification catalyst 33 is reduced by outside air when the operation of the engine 32 is stopped. It is considered that the temperature of the catalyst 33 decreases. In addition, when the temperature of the purification catalyst 33 is low and its function cannot be sufficiently exerted, if a large amount of power is output from the engine 32, the emission deteriorates. Therefore, in the embodiment, a smaller vehicle speed is set as the electric travel allowable vehicle speed Vpm so that the longer the engine stop time tstp is, the longer the time for warming up the purification catalyst 33 is secured. In this way, the electric travel allowable vehicle speed Vpm is set, and when the vehicle speed V becomes higher than the electric travel allowable vehicle speed Vpm in a state where the operation of the engine 32 is stopped, the engine 32 is started, thereby purifying the catalyst as necessary. The engine 32 can be started at a more appropriate timing so that time for warming up 33 is secured. When the engine 32 is started in this manner, the engine 32 may be operated in a driving state suitable for warming up the purification catalyst 33 for a predetermined time, and the traveling power corresponds to the output limit of the battery 48. The engine 32 and the motors 41 and 42 are controlled so that the required torque is output from the motor 42 when the engine 32 is driven independently when the power is less than the power to be driven. The engine 32 and the motors 41 and 42 may be controlled so as to travel with the required torque with the output of power from the engine 32 as in the drive control when the electric travel mode is set.

  According to the hybrid vehicle 20 of the embodiment described above, when the electric travel mode is set and the engine 32 is stopped and the vehicle travels by electric travel, the engine stop time tstp, which is the time during which the engine 32 is stopped, is determined. The longer the vehicle travel time, the smaller the electric travel allowable vehicle speed Vpm is set, and the engine 32 is started when the vehicle speed V becomes higher than the electric travel allowable vehicle speed Vpm. Therefore, a time for warming up the purification catalyst 33 is secured as necessary. As a result, the engine 32 can be started at a more appropriate timing.

  In the hybrid vehicle 20 of the embodiment, the electric travel allowable vehicle speed Vpm is set based on the elapsed time after the operation of the engine 32 is stopped. This is shown in the electric travel priority control routine of the modification of FIG. As described above, the electric travel allowable vehicle speed Vpm is set based on the engine start number Ncl as the number of times the engine 32 has been started since the vehicle was started (step S200), and the set electric travel allowable vehicle speed Vpm is set to the vehicle speed sensor. Compared with the vehicle speed V from 58 (step S210), when the vehicle speed V is equal to or lower than the electric travel allowable vehicle speed Vpm, the vehicle travels with the intermittent operation of the engine 32 giving priority to the electric travel (step S220). When the vehicle speed exceeds the allowable vehicle speed Vpm, the vehicle travels with the operation of the engine 32 regardless of the traveling power. Also good (step S230). The electric travel allowable vehicle speed Vpm in this modification is stored as an electric travel allowable vehicle speed setting map by predetermining the relationship between the engine start frequency Ncl and the electric travel allowable vehicle speed Vpm, and given the engine start frequency Ncl. The electric travel allowable vehicle speed Vpm is derived and set from the stored map. FIG. 5 shows an example of an electric travel allowable vehicle speed setting map according to a modification. As shown in the figure, the electric travel allowable vehicle speed Vpm is set such that the smaller the engine start frequency Ncl, the smaller the vehicle speed. This is because the purification catalyst 33 is considered to be sufficiently warmed up as the number of times the engine 32 is started, and it is necessary to ensure a longer time for warming up the purification catalyst 33 as the engine start frequency Ncl is small. Based on what is believed to be. Also in this case, similarly to the embodiment, the engine 32 can be started at a more appropriate timing so as to ensure the time for warming up the purification catalyst 33 as necessary.

  In the hybrid vehicle 20 of the embodiment or the modified example, the electric travel allowable vehicle speed Vpm is set based on the engine stop time tstp and the engine start frequency Ncl, but the cooling water temperature of the engine 32 is set to a predetermined temperature. When the temperature is higher (for example, 50 ° C., 60 ° C., etc.), a large vehicle speed (for example, the electric travel permission shown in FIGS. The maximum vehicle speed of the vehicle speed setting map may be set. This is based on the fact that when the temperature of the cooling water of the engine 32 is high, the temperature of the purification catalyst 33 is also high and it is considered that warming up is not required.

  In the embodiment, the contents of the present invention have been described by being applied to the hybrid vehicle 20 in which the engine 32, the motor 41, and the drive shaft 22 are connected to the planetary gear 38 and the motor 42 is connected to the drive shaft 22. An exhaust purification device having a purification catalyst for purifying exhaust gas is attached to an exhaust system, an engine capable of outputting power for traveling, a motor capable of outputting power for traveling, and a battery capable of exchanging electric power with the motor For example, in a hybrid vehicle including an engine 32 connected to the drive shaft 22 via a clutch without a motor 41 and a motor 42 connected to the drive shaft 22. It may be applied.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the engine 32 corresponds to the “engine”, the motor 42 corresponds to the “electric motor”, the battery 48 corresponds to the “battery”, and the integration of the current charged / discharged to the battery 48 from a current sensor (not shown). The hybrid electronic control unit 50 that calculates the storage ratio SOC of the battery 48 based on the value corresponds to the “storage ratio calculation means”, and the storage ratio SOC of the battery 48 when the system is started up is a threshold Sev (for example, 40% or 50 When the power storage ratio SOC reaches a threshold value Shv (for example, 20%, 30%, etc.), the hybrid electronic control unit 50 that sets the electric travel priority mode that prioritizes electric travel as the control mode is set to “control mode setting”. It corresponds to “means”. When the electric travel priority mode is set as the control mode and the engine 32 is stopped and the electric vehicle is traveling, the longer the engine stop time tstp that is the time during which the engine 32 is stopped, the longer the electric travel allowable vehicle speed Vpm is. A hybrid electronic control unit that sets a small vehicle speed and transmits a control command to the electronic control unit for motor 36 and the electronic control unit for motor 46 so that the engine 32 is started when the vehicle speed V becomes greater than the allowable electric vehicle speed Vpm. 50 and an engine electronic control unit 36 for controlling the engine 32 to operate at a target operating point, and a motor electronic control unit 46 for controlling the motors 41 and 42 so that the motors 41 and 42 are driven by torque commands. This corresponds to “control means” in the first hybrid vehicle of the present invention, and The smaller the engine start number Ncl, which is the number of times the engine 32 has been started since the system was started, is set to a smaller vehicle speed for the electric travel allowable vehicle speed Vpm. When the vehicle speed V is equal to or lower than the electric travel allowable vehicle speed Vpm, compared to hybrid travel. A control command is transmitted to the engine electronic control unit 36 and the motor electronic control unit 46 so that the electric running is given priority and the requested torque is run. When the vehicle speed V is higher than the electric running allowable vehicle speed Vpm, the engine 32 is operated. The hybrid electronic control unit 50 that transmits a control command to the engine electronic control unit 36 and the motor electronic control unit 46 so as to travel with the required torque, the engine electronic control unit 36 that controls the engine 32 based on the control command, and the control Motor that controls motors 41 and 42 based on the command And the electronic control unit 46 corresponds to the "control means" in the second hybrid vehicle of the present invention.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the manufacturing industry of hybrid vehicles.

  20 hybrid vehicle, 22 drive shaft, 24 differential gear, 26a, 26b drive wheel, 32 engine, 33 purification catalyst, 34 crankshaft, 36 electronic control unit for engine, 38 planetary gear, 41, 42 motor, 43, 44 inverter, 46 Electronic control unit for motor, 48 battery, 50 electronic control unit for hybrid, 52 shift position sensor, 54 accelerator pedal position sensor, 56 brake pedal position sensor, 58 vehicle speed sensor.

Claims (2)

An exhaust purification device having a purification catalyst for purifying exhaust gas is attached to an exhaust system so that it can output power for traveling, an electric motor capable of inputting / outputting power for traveling, and exchange of electric power with the motor A battery, a power storage ratio calculating means for calculating a power storage ratio that is a ratio of the power storage amount stored in the battery to the total capacity, and at least the calculated power storage ratio when the system is started is greater than a first predetermined ratio Sometimes, using the power output from the engine and the power input / output from the electric motor until the calculated power storage ratio is less than the second predetermined ratio which is smaller than the first predetermined ratio. The electric travel priority mode that prioritizes the electric travel that travels using only the power input and output from the electric motor as compared to the hybrid travel that travels is referred to as a control mode. A control mode setting means for setting the engine, and when the electric travel priority mode is set as a control mode, the engine is configured to travel with a required torque required for travel in preference to the electric travel over the hybrid travel. And a control means for controlling the electric motor,
When the electric travel priority mode is set as the control mode and the engine is stopped and the vehicle is traveling by the electric drive, the control means becomes smaller as the time during which the engine is stopped is longer. Means for controlling the engine so that when the vehicle speed becomes higher than the set electric travel allowable vehicle speed, the engine is started when an electric travel allowable vehicle speed is set as an upper limit of the vehicle speed region in which the electric travel is permitted. is there,
A hybrid vehicle characterized by that. An exhaust purification device having a purification catalyst for purifying exhaust gas is attached to an exhaust system so that it can output power for traveling, an electric motor capable of inputting / outputting power for traveling, and exchange of electric power with the motor A battery, a power storage ratio calculating means for calculating a power storage ratio that is a ratio of the power storage amount stored in the battery to the total capacity, and at least the calculated power storage ratio when the system is started is greater than a first predetermined ratio Sometimes, using the power output from the engine and the power input / output from the electric motor until the calculated power storage ratio is less than the second predetermined ratio which is smaller than the first predetermined ratio. The electric travel priority mode that prioritizes the electric travel that travels using only the power input and output from the electric motor as compared to the hybrid travel that travels is referred to as a control mode. Control mode setting means to be set, and when the electric travel priority mode is set as the control mode, the hybrid travel is performed when the vehicle speed is equal to or lower than the electric travel allowable vehicle speed as the upper limit of the vehicle speed range in which the electric travel is permitted. The engine and the electric motor are controlled so as to run at the required torque required for running with priority on the electric running, and when the vehicle speed is greater than the electric running allowable vehicle speed, the request is accompanied with the operation of the engine. In a hybrid vehicle comprising a control means for controlling the engine and the electric motor so as to travel by torque,
The control means is means for controlling the vehicle speed, which is set to decrease as the number of times the engine is started after the system is started, as the electric travel allowable vehicle speed.
A hybrid vehicle characterized by that.

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