JP4285552B2 - Vehicle and control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain a motor from becoming high in temperature, even under sequential shifting control. <P>SOLUTION: When the temperature Tmg of a motor MG2 is a threshold Tref or higher, a shift position SP in which the engine lower limit speed Nemin, corresponding to the same vehicle speed becomes lower the higher the temperature Tmg of the motor MG2 is selected, regardless of a driver's operation of a shift lever (S140). An engine 22 and motors MG1, MG2 are controlled so that the engine 22 is operated at a rotational speed that is not lower than the lower engine lower limit speed Nemin, obtained based on the selected shift position SP and vehicle speed V and that demand torque Tr* is output to a driving shaft within a range of battery input-output limit Win, Wout (S150-S230). The engine is thereby operated at the low rotation and high torque side, and output torque from the motor MG2 is reduced to restrain the motor MG2 from becoming high in temperature. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a vehicle and a control method thereof.

Conventionally, this type of vehicle includes an engine, a power distribution integration mechanism composed of a planetary gear in which a carrier is connected to the crankshaft of the engine and a ring gear is connected to a drive shaft connected to the axle, and power distribution integration A motor MG1 connected to the sun gear of the mechanism and a motor MG2 that outputs power to the drive shaft and that travels using a sequential shift that sets the engine speed relative to the vehicle speed according to the shift operation has been proposed. (For example, refer to Patent Document 1). In this vehicle, a good driving feeling is given to the driver by operating the engine at a speed corresponding to the shift operation and the vehicle speed.
JP 2006-321458 A

  In a vehicle having a configuration similar to that of the vehicle described above, a motor that outputs power to a drive shaft connected to an axle tends to be hot. In the sequential shift, the lower limit engine speed is set with respect to the vehicle speed. If a low speed stage such as the first speed or the second speed is frequently used, the engine is operated at a relatively high speed. Considering the case of traveling with the power necessary for traveling output from the engine, the engine is operated at a relatively high speed, so the output torque from the engine becomes small. The output torque from the engine is output to the drive shaft via the planetary gear, but when the output torque is small, the torque output to the drive shaft via the planetary gear is also small, so that the torque required for the drive shaft is output. A large torque is output from the motor. Therefore, when the engine is operated at a relatively high speed, the frequency of outputting a large torque from the motor increases, so that the motor is likely to become high temperature.

  An object of the vehicle and the control method thereof of the present invention is to suppress the motor from becoming high temperature even in a vehicle having the same configuration as that of the vehicle described above, even if control by sequential shift is performed.

  The vehicle and the control method thereof according to the present invention employ the following means in order to achieve the above-described object.

The vehicle of the present invention
An internal combustion engine;
Connected to the drive shaft connected to the axle and connected to the output shaft of the internal combustion engine so as to be rotatable independently of the drive shaft, and to the drive shaft and the output shaft with input and output of electric power and power Power power input / output means capable of power input / output;
An electric motor capable of outputting power to the drive shaft;
A power storage means capable of exchanging power with the electric power drive input / output means and the electric motor;
Motor temperature detecting means for detecting a motor temperature which is a temperature of the motor;
Vehicle speed detection means for detecting the vehicle speed;
Execution for setting one relationship as a vehicle speed lower limit rotation speed relationship among a plurality of vehicle speed lower limit rotation speed relationships preset as a relationship between the vehicle speed and the lower limit rotation speed of the internal combustion engine based on the shift operation of the operator Vehicle speed lower limit rotational speed relation setting means,
A required driving force setting means for setting a required driving force required for traveling;
When the detected motor temperature is a normal temperature lower than a predetermined temperature, the internal combustion engine is operated at a rotational speed equal to or higher than a lower limit rotational speed based on the detected vehicle speed and the set execution vehicle speed lower limit rotational speed relationship. The internal combustion engine, the electric power drive input / output means, and the electric motor are controlled to run with a driving force based on the set required driving force, and when the detected electric motor temperature is higher than the predetermined temperature, the detection is performed. The internal combustion engine is operated at a rotational speed smaller than a lower limit rotational speed based on the set vehicle speed and the set execution vehicle speed lower limit rotational speed relationship, and travels with a driving force based on the set required driving force. Control means for controlling the internal combustion engine, the power drive input / output means and the electric motor;
It is a summary to provide.

  In the vehicle according to the present invention, one of the plurality of vehicle speed lower limit rotation speed relationships preset as the relationship between the vehicle speed and the lower limit rotation speed of the internal combustion engine based on the shift operation of the operator is executed as the vehicle speed lower limit rotation for execution. Set as a number relationship. When the temperature of the motor is a normal temperature lower than a predetermined temperature, the internal combustion engine is operated at a rotational speed equal to or higher than the lower limit rotational speed based on the vehicle speed and the set execution vehicle speed lower limit rotational speed relationship, and the required drive required for traveling The internal combustion engine, the power drive input / output means, and the electric motor are controlled so as to travel with a driving force based on the force. As a result, the internal combustion engine can be operated at a rotational speed corresponding to the shift operation and the vehicle speed, and a good operation feeling can be given to the operator. In addition, when the temperature of the motor is higher than a predetermined temperature, the internal combustion engine is operated at a rotational speed smaller than the lower limit rotational speed based on the vehicle speed and the set execution vehicle speed lower limit rotational speed relationship, and the driving force based on the required driving force The internal combustion engine, the power drive input / output means, and the electric motor are controlled so as to travel by. By operating the internal combustion engine at a rotational speed smaller than the lower limit rotational speed in this way, the torque output from the internal combustion engine to the drive shaft via the power drive input / output means is increased, and the output torque from the electric motor is reduced. Can do. As a result, it can suppress that an electric motor becomes high temperature.

  In such a vehicle of the present invention, the control means releases the restriction on the lower limit rotational speed based on the detected vehicle speed and the set execution vehicle speed lower limit rotational speed relationship at the time of the high temperature, so that the internal combustion engine It may be a means for controlling the internal combustion engine, the electric power power input / output means, and the electric motor so as to be driven and driven by a driving force based on the set required driving force.

  In the vehicle of the present invention, the control means is selected based on the detected motor temperature from the plurality of vehicle speed lower limit rotational speed relationships at the high temperature, regardless of the shift operation of the operator. The vehicle speed lower limit rotational speed relationship is set as the execution vehicle speed lower limit rotational speed relationship, and the internal combustion engine has a rotational speed equal to or higher than a lower limit rotational speed based on the detected vehicle speed and the set execution vehicle speed lower limit rotational speed relationship. It is also possible to control the internal combustion engine, the power power input / output unit, and the electric motor so that the vehicle travels with a driving force based on the set required driving force. In this case, at the time of the high temperature, the control means selects the vehicle speed lower limit rotational speed relationship so that the lower limit rotational speed with respect to the same vehicle speed becomes smaller as the detected motor temperature is higher, and the execution vehicle speed lower limit rotational speed is selected. It can also be a means for setting as a relationship.

  Further, in the vehicle of the present invention, the power driving input / output means is connected to three axes of a generator for inputting / outputting power, the drive shaft, the output shaft, and a rotating shaft of the generator, It can also be a means provided with three-axis type power input / output means for inputting / outputting power to / from the remaining shafts based on power input / output to / from any two axes.

The vehicle control method of the present invention includes:
Connected to the internal combustion engine and a drive shaft connected to the axle and connected to the output shaft of the internal combustion engine so as to be rotatable independently of the drive shaft, the drive shaft and the output with input and output of electric power and power Power power input / output means capable of inputting / outputting power to / from the shaft, an electric motor capable of outputting power to the drive shaft, and power storage means capable of exchanging electric power with the power power input / output means and the motor. A vehicle control method comprising:
(A) One relationship is set as the execution vehicle speed lower limit rotational speed relationship among a plurality of vehicle speed lower limit rotational speed relationships that are set in advance as the relationship between the vehicle speed and the lower limit rotational speed of the internal combustion engine based on the shift operation of the operator. And
(B) When the temperature of the electric motor is lower than a predetermined temperature, the internal combustion engine is operated at a rotational speed equal to or higher than a lower limit rotational speed based on a vehicle speed and the set execution vehicle speed lower limit rotational speed relationship, and a request required for traveling The internal combustion engine, the power drive input / output means, and the electric motor are controlled so as to travel by the driving force based on the driving force. When the temperature of the electric motor is equal to or higher than the predetermined temperature, the vehicle speed is set to the set execution vehicle speed lower limit rotational speed relationship. Controlling the internal combustion engine, the power power input / output means, and the electric motor so that the internal combustion engine is operated at a rotational speed smaller than a lower limit rotational speed based on the vehicle and travels with a driving force based on the set required driving force.
It is characterized by that.

  In the vehicle control method of the present invention, one relationship is executed from among a plurality of vehicle speed lower limit rotational speed relationships that are set in advance as the relationship between the vehicle speed and the lower limit rotational speed of the internal combustion engine based on the shift operation of the operator. Set as vehicle speed lower limit rotation speed relation. When the temperature of the motor is a normal temperature lower than a predetermined temperature, the internal combustion engine is operated at a rotational speed equal to or higher than the lower limit rotational speed based on the vehicle speed and the set execution vehicle speed lower limit rotational speed relationship, and the required drive required for traveling The internal combustion engine, the power drive input / output means, and the electric motor are controlled so as to travel with a driving force based on the force. As a result, the internal combustion engine can be operated at a rotational speed corresponding to the shift operation and the vehicle speed, and a good operation feeling can be given to the operator. In addition, when the temperature of the motor is higher than a predetermined temperature, the internal combustion engine is operated at a rotational speed smaller than the lower limit rotational speed based on the vehicle speed and the set execution vehicle speed lower limit rotational speed relationship, and the driving force based on the required driving force The internal combustion engine, the power drive input / output means, and the electric motor are controlled so that the vehicle travels. By operating the internal combustion engine at a rotational speed smaller than the lower limit rotational speed in this way, the torque output from the internal combustion engine to the drive shaft via the power drive input / output means is increased, and the output torque from the electric motor is reduced. Can do. As a result, it can suppress that an electric motor becomes high temperature.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a hybrid vehicle 20 according to an embodiment of the present invention. As shown in the figure, the hybrid vehicle 20 of the embodiment includes an engine 22, a three-shaft power distribution / integration mechanism 30 connected to a crankshaft 26 as an output shaft of the engine 22 via a damper 28, and power distribution / integration. A motor MG1 capable of generating electricity connected to the mechanism 30, a reduction gear 35 attached to a ring gear shaft 32a as a drive shaft connected to the power distribution and integration mechanism 30, a motor MG2 connected to the reduction gear 35, And a hybrid electronic control unit 70 for controlling the entire power output apparatus.

  The engine 22 is configured as an internal combustion engine capable of outputting power using a hydrocarbon-based fuel such as gasoline or light oil, and the air purified by an air cleaner 122 is passed through a throttle valve 124 as shown in FIG. Inhalation and gasoline are injected from the fuel injection valve 126 to mix the sucked air and gasoline. The mixture is sucked into the fuel chamber through the intake valve 128 and is explosively burned by an electric spark from the spark plug 130. Thus, the reciprocating motion of the piston 132 pushed down by the energy is converted into the rotational motion of the crankshaft 26. Exhaust gas from the engine 22 is discharged to the outside air through a purification device (three-way catalyst) 134 that purifies harmful components such as carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx).

  The engine 22 is controlled by an engine electronic control unit (hereinafter referred to as an engine ECU) 24. The engine ECU 24 is configured as a microprocessor centered on the CPU 24a, and includes a ROM 24b that stores a processing program, a RAM 24c that temporarily stores data, an input / output port and a communication port (not shown), in addition to the CPU 24a. . The engine ECU 24 includes signals from various sensors that detect the state of the engine 22, a crank position from the crank position sensor 140 that detects the rotational position of the crankshaft 26, and a water temperature sensor 142 that detects the temperature of cooling water in the engine 22. From the cooling water temperature from the combustion chamber, the in-cylinder pressure Pin from the pressure sensor 143 installed in the combustion chamber, the intake valve 128 that performs intake and exhaust to the combustion chamber, and the cam position sensor 144 that detects the rotational position of the camshaft that opens and closes the exhaust valve Cam position, throttle position from the throttle valve position sensor 146 for detecting the position of the throttle valve 124, an air flow meter signal AF from the air flow meter 148 attached to the intake pipe, and a temperature sensor also attached to the intake pipe Intake air temperature from 49, the air-fuel ratio AF from an air-fuel ratio sensor 135a, such as oxygen signal from an oxygen sensor 135b is input via the input port. The engine ECU 24 also integrates various control signals for driving the engine 22, such as a drive signal to the fuel injection valve 126, a drive signal to the throttle motor 136 that adjusts the position of the throttle valve 124, and an igniter. The control signal to the ignition coil 138 and the control signal to the variable valve timing mechanism 150 that can change the opening / closing timing of the intake valve 128 are output via the output port. The engine ECU 24 is in communication with the hybrid electronic control unit 70, controls the operation of the engine 22 by a control signal from the hybrid electronic control unit 70, and outputs data related to the operation state of the engine 22 as necessary. . The engine ECU 24 also calculates the rotational speed of the crankshaft 26, that is, the rotational speed Ne of the engine 22 based on the crank position from the crank position sensor 140.

  The power distribution and integration mechanism 30 includes an external gear sun gear 31, an internal gear ring gear 32 arranged concentrically with the sun gear 31, a plurality of pinion gears 33 that mesh with the sun gear 31 and mesh with the ring gear 32, A planetary gear mechanism is provided that includes a carrier 34 that holds a plurality of pinion gears 33 so as to rotate and revolve, and that performs differential action using the sun gear 31, the ring gear 32, and the carrier 34 as rotational elements. In the power distribution and integration mechanism 30, the crankshaft 26 of the engine 22 is connected to the carrier 34, the motor MG1 is connected to the sun gear 31, and the reduction gear 35 is connected to the ring gear 32 via the ring gear shaft 32a. When functioning as a generator, power from the engine 22 input from the carrier 34 is distributed according to the gear ratio between the sun gear 31 side and the ring gear 32 side, and when the motor MG1 functions as an electric motor, the engine input from the carrier 34 The power from 22 and the power from the motor MG1 input from the sun gear 31 are integrated and output to the ring gear 32 side. The power output to the ring gear 32 is finally output from the ring gear shaft 32a to the drive wheels 63a and 63b of the vehicle via the gear mechanism 60 and the differential gear 62.

  The motor MG1 and the motor MG2 are both configured as well-known synchronous generator motors that can be driven as generators and can be driven as motors, and exchange power with the battery 50 via inverters 41 and 42. The power line 54 connecting the inverters 41 and 42 and the battery 50 is configured as a positive electrode bus and a negative electrode bus shared by the inverters 41 and 42, and the electric power generated by one of the motors MG1 and MG2 It can be consumed by a motor. Therefore, battery 50 is charged / discharged by electric power generated from one of motors MG1 and MG2 or insufficient electric power. If the balance of electric power is balanced by the motors MG1 and MG2, the battery 50 is not charged / discharged. The motors MG1 and MG2 are both driven and controlled by a motor electronic control unit (hereinafter referred to as a motor ECU) 40. The motor ECU 40 is equipped with signals necessary for driving and controlling the motors MG1 and MG2, such as signals from rotational position detection sensors 43 and 44 for detecting the rotational positions of the rotors of the motors MG1 and MG2, and the motor MG2. The motor temperature Tmg from the temperature sensor 46, the phase current applied to the motors MG1 and MG2 detected by a current sensor (not shown), and the like are input, and the motor ECU 40 outputs a switching control signal to the inverters 41 and 42. Has been. The motor ECU 40 is in communication with the hybrid electronic control unit 70, controls the driving of the motors MG1 and MG2 by a control signal from the hybrid electronic control unit 70, and, if necessary, data on the operating state of the motors MG1 and MG2. Output to the hybrid electronic control unit 70. The motor ECU 40 also calculates the rotational speeds Nm1 and Nm2 of the motors MG1 and MG2 based on signals from the rotational position detection sensors 43 and 44.

  The battery 50 is managed by a battery electronic control unit (hereinafter referred to as a battery ECU) 52. The battery ECU 52 receives signals necessary for managing the battery 50, for example, a voltage between terminals from a voltage sensor (not shown) installed between terminals of the battery 50, and a power line 54 connected to the output terminal of the battery 50. The charging / discharging current from the attached current sensor (not shown), the battery temperature Tb from the temperature sensor 51 attached to the battery 50, and the like are input. Output to the control unit 70. Further, the battery ECU 52 calculates the remaining capacity (SOC) based on the integrated value of the charging / discharging current detected by the current sensor in order to manage the battery 50, and calculates the remaining capacity (SOC) and the battery temperature Tb. The input / output limits Win and Wout, which are the maximum allowable power that may charge / discharge the battery 50, are calculated based on the above.

  The hybrid electronic control unit 70 is configured as a microprocessor centered on the CPU 72. In addition to the CPU 72, a ROM 74 that stores processing programs, a RAM 76 that temporarily stores data, an input / output port and communication (not shown), and the like. And a port. The hybrid electronic control unit 70 includes an ignition signal from an ignition switch 80, a shift position SP from a shift position sensor 82 that detects the operation position of the shift lever 81, and an accelerator pedal position sensor 84 that detects the amount of depression of the accelerator pedal 83. The accelerator opening Acc from the vehicle, the brake pedal position BP from the brake pedal position sensor 86 for detecting the depression amount of the brake pedal 85, the vehicle speed V from the vehicle speed sensor 88, and the like are input via the input port. As described above, the hybrid electronic control unit 70 is connected to the engine ECU 24, the motor ECU 40, and the battery ECU 52 via the communication port, and exchanges various control signals and data with the engine ECU 24, the motor ECU 40, and the battery ECU 52. ing.

  Further, in the hybrid vehicle 20 of the embodiment, as the shift position SP of the shift lever 81, the parking position (P position) used during parking, the reverse position (R position) for reverse travel, the neutral position (N position), the forward position In addition to the normal driving position (D position) for traveling, a sequential shift position (S position), an upshift instruction position, and a downshift instruction position are prepared. When the D position is selected as the shift position SP, the hybrid vehicle 20 of the embodiment performs drive control so that the engine 22 is operated efficiently and the response of the power output is relatively good. If the S position is selected as the shift position SP, it is possible to change the ratio of the rotational speed of the engine 22 with respect to the vehicle speed V to, for example, six stages (SP1 to SP6) mainly during deceleration. In the embodiment, when the shift lever 81 is set to the S position by the driver, the shift position SP is set to SP5 at the fifth stage, and the shift position sensor 82 detects that the shift position SP = SP5. Thereafter, when the shift lever 81 is set to the upshift instruction position, the shift position SP is raised by one step (upshifted), while when the shift lever 81 is set to the downshift instruction position, the shift position SP is set to 1. The position is lowered (downshifted) step by step, and the shift position sensor 82 outputs the current shift position SP according to the operation of the shift lever 81.

  The hybrid vehicle 20 of the embodiment thus configured calculates the required torque to be output to the ring gear shaft 32a as the drive shaft based on the accelerator opening Acc and the vehicle speed V corresponding to the depression amount of the accelerator pedal 83 by the driver. Then, the operation of the engine 22, the motor MG1, and the motor MG2 is controlled so that the required power corresponding to the required torque is output to the ring gear shaft 32a. As operation control of the engine 22, the motor MG1, and the motor MG2, the operation of the engine 22 is controlled so that power corresponding to the required power is output from the engine 22, and all of the power output from the engine 22 is the power distribution and integration mechanism 30. Torque conversion operation mode for driving and controlling the motor MG1 and the motor MG2 so that the torque is converted by the motor MG1 and the motor MG2 and output to the ring gear shaft 32a, and the required power and the power required for charging and discharging the battery 50. The engine 22 is operated and controlled so that suitable power is output from the engine 22, and all or part of the power output from the engine 22 with charging / discharging of the battery 50 is the power distribution and integration mechanism 30, the motor MG1, and the motor. The required power is converted to the ring gear shaft 32 with torque conversion by MG2. Charge / discharge operation mode in which the motor MG1 and the motor MG2 are driven and controlled to be output to each other, and a motor operation mode in which the operation of the engine 22 is stopped and the power corresponding to the required power from the motor MG2 is output to the ring gear shaft 32a. and so on.

  Next, the operation of the hybrid vehicle 20 of the embodiment configured as described above, particularly the operation when the temperature of the motor MG2 becomes high while the shift lever 81 is traveling in the sequential shift position (S position) will be described. . FIG. 3 is a flowchart showing an example of a drive control routine executed by the hybrid electronic control unit 70 when the shift lever 81 is in the sequential shift position (S position). This routine is repeatedly executed every predetermined time (for example, every several msec).

  When the drive control routine is executed, first, the CPU 72 of the hybrid electronic control unit 70 first determines the accelerator opening Acc from the accelerator pedal position sensor 84, the vehicle speed V from the vehicle speed sensor 88, the rotational speed Nm1, of the motors MG1, MG2. Nm2, a shift position SP from the shift position sensor 82, a motor temperature Tmg, input / output limits Win and Wout of the battery 50, and other data necessary for control are executed (step S100). Here, the rotational speeds Nm1 and Nm2 of the motors MG1 and MG2 are input from the motor ECU 40 by communication from those calculated based on the rotational positions of the rotors of the motors MG1 and MG2 detected by the rotational position detection sensors 43 and 44. To do. Further, the motor temperature Tmg detected by the temperature sensor 46 is input from the motor ECU 40 by communication. Further, the input / output limits Win and Wout of the battery 50 are set based on the battery temperature Tb of the battery 50 and the remaining capacity (SOC) of the battery 50 and input from the battery ECU 52 by communication.

  When the data is thus input, the required torque Tr * to be output to the ring gear shaft 32a as the drive shaft connected to the drive wheels 63a and 63b as the torque required for the vehicle based on the input accelerator opening Acc and the vehicle speed V. And the required power Pe * required for the engine 22 is set (step S110). In the embodiment, the required torque Tr * is determined in advance by storing the relationship between the accelerator opening Acc, the vehicle speed V, and the required torque Tr * in the ROM 74 as a required torque setting map, and the accelerator opening Acc, the vehicle speed V, , The corresponding required torque Tr * is derived and set from the stored map. FIG. 4 shows an example of the required torque setting map. The required power Pe * can be calculated as the sum of the set required torque Tr * multiplied by the rotational speed Nr of the ring gear shaft 32a and the charge / discharge required power Pb * required by the battery 50 and the loss Loss. The rotational speed Nr of the ring gear shaft 32a is obtained by multiplying the vehicle speed V by a conversion factor k (Nr = k · V), or the rotational speed Nm2 of the motor MG2 is divided by the gear ratio Gr of the reduction gear 35 (Nr = Nm2 / Gr).

  Subsequently, based on the set required power Pe *, a temporary rotational speed Nettmp and a temporary torque Tentmp which are temporary values as operating points at which the engine 22 should be operated are set (step S120). This setting is performed based on an operation line for efficiently operating the engine 22 and the required power Pe *. FIG. 5 shows an example of the operation line of the engine 22 and how the temporary rotational speed Nettmp and the temporary torque Tentmp are set. As shown in the figure, the temporary rotational speed Netmp and the temporary torque Tentmp can be obtained from the intersection of the operation line and a curve having a constant required power Pe * (Netmp × Tempp).

  Next, it is determined whether or not the temperature Tmg of the motor MG2 is equal to or higher than a threshold value Tref (step S130). Here, the threshold value Tref is set as a temperature lower than the upper limit of the allowable temperature range of the motor MG2 that can output the rated maximum torque from the motor MG2, for example, a temperature of about 70% of the allowable temperature range. Can be used.

  When the temperature Tmg of the motor MG2 is less than the threshold value Tref, it is determined that the motor MG2 is in a temperature state that can sufficiently exhibit its performance, and the engine lower limit rotation speed Nemin is set based on the shift position SP and the vehicle speed V. (Step S150), the smaller one of the temporary rotational speed Netmp and the engine lower limit rotational speed Nemin is set as the target rotational speed Ne * at which the engine 22 should be operated, and the required power Pe * is set as the target rotational speed Ne *. The target torque Te * to be output from the engine 22 is set (step S160). Here, when the shift position SP is at the S position, the engine lower limit rotation speed Nemin is set to a smaller value according to the shift position SP, that is, as the number of steps increases with respect to the same vehicle speed V. In the example, the relationship between the shift position SP, the vehicle speed V, and the engine lower limit rotational speed Nemin is set in advance and stored in the ROM 74 as an engine lower limit rotational speed setting map, and the map is obtained when the shift position SP and the vehicle speed V are given. From this, the corresponding engine lower limit rotational speed Nemin is derived and set. An example of the engine lower limit speed setting map is shown in FIG.

  Next, the target rotational speed Nm1 * of the motor MG1 is calculated by the following equation (1) using the target rotational speed Ne * of the engine 22, the rotational speed Nm2 of the motor MG2, and the gear ratio ρ of the power distribution and integration mechanism 30. Based on the calculated target rotational speed Nm1 * and the input rotational speed Nm1 of the motor MG1, a temporary torque Tm1tmp, which is a temporary value of the torque to be output from the motor MG1, is calculated by Expression (2) (step S170). Here, Expression (1) is a dynamic relational expression for the rotating element of the power distribution and integration mechanism 30. FIG. 7 is a collinear diagram showing a dynamic relationship between the rotational speed and torque in the rotating elements of the power distribution and integration mechanism 30 when traveling with the power output from the engine 22. In the figure, the left S-axis indicates the rotation speed of the sun gear 31 that is the rotation speed Nm1 of the motor MG1, the C-axis indicates the rotation speed of the carrier 34 that is the rotation speed Ne of the engine 22, and the R-axis indicates the rotation speed of the motor MG2. The rotational speed Nr of the ring gear 32 obtained by dividing the number Nm2 by the gear ratio Gr of the reduction gear 35 is shown. Expression (1) can be easily derived by using this alignment chart. The two thick arrows on the R axis indicate that the torque Tm1 output from the motor MG1 acts on the ring gear shaft 32a and the torque Tm2 output from the motor MG2 acts on the ring gear shaft 32a via the reduction gear 35. Torque. Expression (2) is a relational expression in feedback control for rotating the motor MG1 at the target rotational speed Nm1 *. In Expression (2), “k1” in the second term on the right side is a gain of a proportional term. “K2” in the third term on the right side is the gain of the integral term.

Nm1 * = Ne * ・ (1 + ρ) / ρ-Nm2 / ρ (1)
Tm1tmp = ρ ・ Te * / (1 + ρ) + k1 (Nm1 * -Nm1) + k2∫ (Nm1 * -Nm1) dt (2)

  Subsequently, torque limits Tm1min and Tm1max are set as upper and lower limits of the torque that may be output from the motor MG1 that satisfies both the expressions (3) and (4) (step S180), and the set temporary torque Tm1tmp is expressed by the expression ( The torque command Tm1 * of the motor MG1 is set by limiting with the torque limits Tm1min and Tm1max according to 5) (step 190). Here, Expression (3) is a relationship in which the sum of torques output to the ring gear shaft 32a by the motor MG1 and the motor MG2 is within a range from the value 0 to the required torque Tr *, and Expression (4) is the relationship with the motor MG1. This is a relationship in which the sum of the electric power input and output by the motor MG2 is within the range of the input and output limits Win and Wout. An example of the torque limits Tm1min and Tm1max is shown in FIG. The torque limits Tm1min and Tm1max can be obtained as the maximum value and the minimum value of the torque command Tm1 * in the region indicated by the oblique lines in the figure.

0 ≦ −Tm1 / ρ + Tm2, Gr ≦ Tr * (3)
Win ≦ Tm1 / Nm1 + Tm2 / Nm2 ≦ Wout (4)
Tm1 * = max (min (Tm1tmp, Tm1max), Tm1min) (5)

  Then, the torque command Tm1 * set as the required torque Tr * is divided by the gear ratio ρ of the power distribution and integration mechanism 30 and further divided by the gear ratio Gr of the reduction gear 35 to obtain the torque to be output from the motor MG2. A temporary torque Tm2tmp, which is a temporary value, is calculated by the following equation (6) (step S200), and the input / output limits Win and Wout of the battery 50 and the set torque command Tm1 * are multiplied by the current rotational speed Nm1 of the motor MG1. The torque limits Tm2min and Tm2max as upper and lower limits of the torque that may be output from the motor MG2 by dividing the deviation from the power consumption (generated power) of the motor MG1 obtained by the number of revolutions Nm2 of the motor MG2 ) And formula (8) (step S210) and the set temporary torque Tm2tmp is calculated by formula (9). Click restriction Tm2min, to limit to set a torque command Tm2 * of the motor MG2 by Tm2max (step S220). Here, Expression (6) can be easily derived from the alignment chart of FIG.

Tm2tmp = (Tr * + Tm1 * / ρ) / Gr (6)
Tm2min = (Win-Tm1 * ・ Nm1) / Nm2 (7)
Tm2max = (Wout-Tm1 * ・ Nm1) / Nm2 (8)
Tm2 * = max (min (Tm2tmp, Tm2max), Tm2min) (9)

  Thus, when the target engine speed Ne *, the target torque Te *, and the torque commands Tm1 *, Tm2 * of the motors MG1, MG2 are set, the target engine speed Ne * and the target torque Te * of the engine 22 are set in the engine ECU 24. The torque commands Tm1 * and Tm2 * for the motors MG1 and MG2 are transmitted to the motor ECU 40 (step S230), and the drive control routine ends. The engine ECU 24 that has received the target rotational speed Ne * and the target torque Te * controls the intake air amount in the engine 22 so that the engine 22 is operated at the operating point indicated by the target rotational speed Ne * and the target torque Te *. Controls such as fuel injection control and ignition control. The motor ECU 40 that has received the torque commands Tm1 * and Tm2 * controls the switching elements of the inverters 41 and 42 so that the motor MG1 is driven by the torque command Tm1 * and the motor MG2 is driven by the torque command Tm2 *. To do. By such control, the engine 22 is operated at a rotational speed equal to or higher than the engine lower limit rotational speed Nemin according to the shift position SP and the vehicle speed V, and the ring gear shaft 32a serving as the drive shaft is within the range of the input / output limits Win and Wout of the battery 50. The vehicle can travel by outputting the required torque Tr *.

  On the other hand, if it is determined in step S130 that the temperature Tmg of the motor MG2 is equal to or higher than the threshold value Tref, it is determined that there is a possibility that the motor MG2 becomes high temperature, and the shift position SP as a sequential shift is set based on the temperature Tmg of the motor MG2. The engine lower limit speed Nemin is set based on the set shift position SP and the vehicle speed V (step S150), and the target engine speed Ne of the engine 22 is set using the set engine lower limit speed Nemin. * And target torque Te * are set (step S160), the engine 22 is operated at the set target rotational speed Ne *, and the required torque Tr * is driven within the range of the input / output limits Win and Wout of the battery 50. Motor MG1, so as to be output to the ring gear shaft 32a Torque commands Tm1 * and Tm2 * for G2 are set (steps S190 and S220), the target rotational speed Ne * and the target torque Te * are transmitted to the engine ECU 24, and the torque commands Tm1 * and Tm2 * are transmitted to the motor ECU 40, respectively. (Step S230), the drive control routine is terminated. Here, the setting of the shift position SP based on the temperature Tmg of the motor MG2 is performed by selecting the shift position SP in which the lower engine speed Nemin corresponding to the same vehicle speed is lower as the temperature Tmg of the motor MG2 is higher. In the example, the relationship between the temperature Tmg of the motor MG2 and the shift position SP is predetermined and stored in the ROM 74 as a shift position setting map, and when the temperature Tmg of the motor MG2 is given, the corresponding shift position SP is derived from the map. To do it. An example of the shift position setting map is shown in FIG. In the example of FIG. 9, above the threshold Tref, the shift position SP is set as four or more stages of SP4. Consider a case in which the shift position SP is traveling at SP1 or SP2. At this time, as can be seen from FIG. 6, the engine 22 is operated at a relatively high rotational speed, and the output torque from the engine 22 is relatively small. The torque (direct torque) Ter output from the engine 22 to the ring gear shaft 32a via the power distribution and integration mechanism 30 is expressed by the following equation (10) in a steady state where the output torque of the engine 22 is Te. Therefore, if the required torque Tr * is to be output to the ring gear shaft 32a, it is necessary to output the torque Tm2 calculated by the equation (11) from the motor MG2. When the shift position SP is changed from SP1 or SP2 to SP4, the engine lower limit rotational speed Nemin becomes small, and as a result, the engine 22 is also operated at a low rotational speed. At this time, since the same required power Pe * is output from the engine 22, the output torque Te from the engine 22 increases, and the torque Tm2 output from the motor MG2 decreases from the equation (11). In the embodiment, when the temperature Tmg of the motor MG2 is equal to or higher than the threshold value Tref, regardless of the driver's operation of the shift lever 81, the higher the temperature Tmg of the motor MG2, the lower the engine lower limit rotational speed Nemin corresponding to the same vehicle speed. The engine 22 and the motors MG1 and MG2 are controlled by selecting the shift position SP to be operated, so that the engine 22 is operated on the low-rotation high-torque side, thereby reducing the output torque of the motor MG2 and reducing the temperature of the motor MG2. It suppresses the rise.

Ter = Te / (1 + ρ) (10)
Tm2 = [Tr * -Te (1 + ρ)] / Gr (11)

  According to the hybrid vehicle 20 of the embodiment described above, when the temperature Tmg of the motor MG2 is equal to or higher than the threshold value Tref, the higher the temperature Tmg of the motor MG2 is, the higher the same vehicle speed is, regardless of the driver's operation of the shift lever 81. A shift position SP at which the corresponding engine lower limit rotational speed Nemin becomes lower is selected, the engine 22 is operated at a rotational speed that is smaller than the lower engine lower limit rotational speed Nemin obtained based on the selected shift position SP and the vehicle speed V, and the battery The engine 22 and the motors MG1 and MG2 are controlled so that the required torque Tr * is output to the ring gear shaft 32a as the drive shaft within the range of 50 input / output limits Win and Wout, so that the vehicle is traveling at the sequential shift position. The ring with the required torque Tr * as the drive shaft Motor MG2 while outputting the Ya axis 32a can be prevented from becoming a high temperature. Of course, when the temperature Tmg of the motor MG2 is less than the threshold value Tref, the engine 22 is operated at a rotational speed equal to or higher than the engine lower limit rotational speed Nemin corresponding to the shift position SP and the vehicle speed V, and the ranges of the input / output limits Win and Wout of the battery 50 are reached. Since the required torque Tr * is output to the ring gear shaft 32a as the drive shaft and the vehicle travels, the driver's operation feeling can be improved.

  In the hybrid vehicle 20 of the embodiment, when the temperature Tmg of the motor MG2 is equal to or higher than the threshold value Tref, regardless of the driver's operation of the shift lever 81, the higher the temperature Tmg of the motor MG2, the higher the engine lower limit rotation corresponding to the same vehicle speed. The shift position SP at which the number Nemin is reduced is selected, and the engine 22 is operated at a rotational speed equal to or higher than the smaller engine lower limit rotational speed Nemin obtained based on the selected shift position SP and the vehicle speed V. The motor MG2 When the temperature Tmg of the engine is equal to or higher than the threshold value Tref, the engine 22 may be operated at a rotational speed equal to or higher than the engine lower limit rotational speed Nemin obtained with the shift position SP as SP6 regardless of the operation of the shift lever 81 by the driver. .

  In the hybrid vehicle 20 of the embodiment, when the temperature Tmg of the motor MG2 is equal to or higher than the threshold value Tref, regardless of the driver's operation of the shift lever 81, the higher the temperature Tmg of the motor MG2, the higher the engine lower limit rotation corresponding to the same vehicle speed. The shift position SP at which the number Nemin is reduced is selected, and the engine 22 is operated at a rotational speed equal to or higher than the smaller engine lower limit rotational speed Nemin obtained based on the selected shift position SP and the vehicle speed V. The motor MG2 When the temperature Tmg of the engine is equal to or higher than the threshold value Tref, the engine 22 only needs to be operated in the low-rotation high-torque operation region, so that the sequential shift position is canceled and the required power Pe * can be output from the engine 22 at a low rotational speed. Is set as the target speed Ne * and engine 2 It may be as to operate the.

  In the hybrid vehicle 20 of the embodiment, the six shift positions SP1 to SP6 are used in the sequential shift positions, but the shift positions SP may be five or less, or may be seven or more shift positions SP.

  In the hybrid vehicle 20 of the embodiment, torque limits Tm1min and Tm1max for limiting the temporary torque Tm1tmp of the motor MG1 within the range satisfying the above-described formulas (3) and (4) are obtained, and the torque command Tm1 * of the motor MG1 is set. At the same time, the torque limits Tm2min and Tm2max are obtained from the equations (7) and (8) and the torque command Tm2 * of the motor MG2 is set. However, the torque limits Tm1min and Tm1max are limited within the range satisfying the equations (3) and (4) The motor torque Tm1tmp is set as it is as the torque command Tm1 * of the motor MG1, and the torque limit Tm2min and Tm2max are obtained from the equations (7) and (8) using the torque command Tm1 *. Tm2 * may be set. In addition, if the torque command Tm1 * Tm2 * of the motors MG1, MG2 is set within the range of the input / output limits Win, Wout of the battery 50 using the rotational speed Nm2 of the motor MG2 and the expected motor rotational speed Nm2est, Any method may be used.

  In the hybrid vehicle 20 of the embodiment, the motor MG2 is attached to the ring gear shaft 32a as the drive shaft via the reduction gear 35. However, the motor MG2 may be directly attached to the ring gear shaft 32a, or Instead, the motor MG2 may be attached to the ring gear shaft 32a via a transmission such as a 2-speed, 3-speed, or 4-speed.

  In the hybrid vehicle 20 of the embodiment, the power of the motor MG2 is changed by the reduction gear 35 and output to the ring gear shaft 32a. However, as illustrated in the hybrid vehicle 120 of the modification of FIG. May be connected to an axle (an axle connected to the wheels 64a and 64b in FIG. 10) different from an axle to which the ring gear shaft 32a is connected (an axle to which the drive wheels 63a and 63b are connected).

  In the hybrid vehicle 20 of the embodiment, the power of the engine 22 is output to the ring gear shaft 32a as the drive shaft connected to the drive wheels 63a and 63b via the power distribution and integration mechanism 30, but the modified example of FIG. The hybrid vehicle 220 includes an inner rotor 232 connected to the crankshaft 26 of the engine 22 and an outer rotor 234 connected to a drive shaft that outputs power to the drive wheels 63a and 63b. A counter-rotor motor 230 that transmits a part of the power to the drive shaft and converts the remaining power into electric power may be provided.

  Moreover, it is not limited to what is applied to such a hybrid vehicle, It is good also as a form of vehicles other than a motor vehicle, and the control method of a vehicle.

  Here, 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 22 corresponds to an “internal combustion engine”, the power distribution and integration mechanism 30 and the motor MG1 correspond to “power power input / output means”, the motor MG2 corresponds to “electric motor”, and the battery 50 corresponds to “ It is equivalent to “electric storage means”, the temperature sensor 46 is equivalent to “motor temperature detection means”, the vehicle speed sensor 88 is equivalent to “vehicle speed detection means”, and the shift position SP is set based on the operation of the shift lever 81. The electronic control unit 70 corresponds to “execution vehicle speed lower limit rotational speed relationship setting means”, and performs the process of step S110 of the drive control routine of FIG. 3 for setting the required torque Tr * based on the accelerator opening Acc and the vehicle speed V. The hybrid electronic control unit 70 to be executed corresponds to “required driving force setting means”, and when the temperature Tmg of the motor MG2 is lower than the threshold value Tref, the operation is performed. The engine 22 is operated at a rotational speed equal to or higher than the engine lower limit rotational speed Nemin obtained based on the shift position SP and the vehicle speed V according to the operation of the shift lever 81 by the user, and ranges of input and output limits Win and Wout of the battery 50 The target rotational speed Ne * and target torque Te * of the engine 22 and torque commands Tm1 * and Tm2 * of the motors MG1 and MG2 are set and transmitted so that the required torque Tr * is output to the ring gear shaft 32a as the drive shaft. When the temperature Tmg of the motor MG2 is equal to or higher than the threshold value Tref, regardless of the driver's operation of the shift lever 81, the higher the temperature Tmg of the motor MG2, the lower the engine lower limit rotational speed Nemin corresponding to the same vehicle speed. The position SP is selected and obtained based on the selected shift position SP and the vehicle speed V. The engine 22 is operated at a rotational speed smaller than the engine lower limit rotational speed Nemin, and the required torque Tr * is output to the ring gear shaft 32a as the drive shaft within the range of the input / output limits Win and Wout of the battery 50. Hybrid electronic for executing steps S130 to S230 of the drive control routine of FIG. 3 for setting and transmitting the target rotational speed Ne *, target torque Te * and torque commands Tm1 * and Tm2 * of the motors MG1 and MG2. An engine ECU 24 that controls the engine 22 based on the control unit 70, the target rotational speed Ne *, and the target torque Te * and a motor ECU 40 that controls the motors MG1 and MG2 based on the torque commands Tm1 * and Tm2 * Is equivalent to. Further, the motor MG1 corresponds to a “generator”, and the power distribution and integration mechanism 30 corresponds to a “3-axis power input / output unit”. Further, the counter-rotor motor 230 also corresponds to “power power input / output means”. Here, the “internal combustion engine” is not limited to an internal combustion engine that outputs power using a hydrocarbon fuel such as gasoline or light oil, and may be any type of internal combustion engine such as a hydrogen engine. The “power power input / output means” is not limited to the combination of the power distribution and integration mechanism 30 and the motor MG1 or the counter-rotor motor 230, and is connected to the drive shaft connected to the axle. Any one is connected to the output shaft of the internal combustion engine so as to be able to rotate independently of the drive shaft, and can input and output power to and from the drive shaft and the output shaft with input and output of electric power and power. It does not matter. The “motor” is not limited to the motor MG2 configured as a synchronous generator motor, and may be any type of motor as long as it can input and output power to the drive shaft, such as an induction motor. . The “power storage means” is not limited to the battery 50 as a secondary battery, and may be anything as long as it can exchange power with a power power input / output means such as a capacitor and an electric motor. The “motor temperature detecting means” is not limited to the temperature sensor 46 directly attached to the motor MG2, and the temperature of the motor MG2 is estimated based on the temperature of the cooling medium that cools the motor MG2. Any device can be used as long as it detects the motor temperature, which is the temperature of the motor. The “vehicle speed detection means” is not limited to the vehicle speed sensor 88, but is used to calculate the vehicle speed V based on the rotation speed of the ring gear shaft 32a as a drive shaft, or to be attached to the drive wheels 63a, 63b and the driven wheels. Any device that detects the vehicle speed, such as a device that calculates the vehicle speed V based on a signal from the wheel speed sensor, may be used. The “execution vehicle speed lower limit rotational speed relationship setting means” is not limited to the setting of the shift position SP based on the operation of the shift lever 81, and the vehicle speed and the internal combustion engine are set based on the shift operation of the operator. Any one of a plurality of vehicle speed lower limit rotation speed relationships set in advance as a relationship with the lower limit rotation speed may be used as long as one relationship is set as the execution vehicle speed lower limit rotation speed relationship. The “required driving force setting means” is not limited to the one that sets the required torque Tr * based on the accelerator opening Acc and the vehicle speed V, but sets the required torque based only on the accelerator opening Acc. If the required driving force required for traveling is set, such as those for which the required torque is set based on the traveling position on the traveling route, such as those for which the driving route is set in advance I do not care. The “control means” is not limited to the combination of the hybrid electronic control unit 70, the engine ECU 24, and the motor ECU 40, and may be configured by a single electronic control unit. Further, as the “control means”, when the temperature Tmg of the motor MG2 is lower than the threshold value Tref, the engine lower limit rotation speed Nemin or more obtained based on the shift position SP and the vehicle speed V according to the operation of the shift lever 81 by the driver. And the engine 22 and the motors MG1 and MG2 are controlled so that the required torque Tr * is output to the ring gear shaft 32a as the drive shaft within the range of the input / output limits Win and Wout of the battery 50. When the temperature Tmg of the motor MG2 is equal to or higher than the threshold value Tref, regardless of the driver's operation of the shift lever 81, the higher the temperature Tmg of the motor MG2, the lower the engine lower limit rotational speed Nemin corresponding to the same vehicle speed. Select position SP and based on selected shift position SP and vehicle speed V The engine 22 is operated at a rotational speed smaller than the obtained lower engine lower limit rotational speed Nemin, and the required torque Tr * is output to the ring gear shaft 32a as the drive shaft within the range of the input / output limits Win and Wout of the battery 50. The engine 22 and the motors MG1, MG2 are not limited to those that control the motor 22 and when the temperature Tmg of the motor MG2 is equal to or higher than the threshold Tref, the shift position SP is set to SP6 regardless of the operation of the shift lever 81 by the driver. When the engine 22 is operated at a rotational speed equal to or higher than the engine lower limit rotational speed Nemin obtained, or when the temperature Tmg of the motor MG2 is equal to or higher than the threshold Tref, the sequential shift position is canceled and the required power Pe * is output from the engine 22. Reduce the number of rotations within the possible range When the motor temperature is lower than a predetermined temperature, such as when the engine speed is set as the standard speed Ne *, the engine speed is more than the lower limit speed based on the vehicle speed and the set execution vehicle speed lower limit speed relationship. The internal combustion engine is operated at the rotational speed of the engine and the internal combustion engine, the power drive input / output means, and the electric motor are controlled so as to travel with the driving force based on the required driving force required for traveling. The internal combustion engine and the power power input / output means so that the internal combustion engine is operated at a rotational speed smaller than the lower limit rotational speed based on the vehicle speed and the execution vehicle speed lower limit rotational speed relationship at a high temperature and travels with the driving force based on the required driving force. Any device that controls the electric motor may be used. The “generator” is not limited to the motor MG1 configured as a synchronous generator motor, and may be any type of generator such as an induction motor that can input and output power. The “three-axis power input / output means” is not limited to the power distribution / integration mechanism 30 described above, but includes four or more shafts using a double pinion type planetary gear mechanism or a combination of a plurality of planetary gear mechanisms. Connected to the three shafts, such as those connected to the shaft and those having a different operation action from the planetary gear such as a differential gear, and connected to the three shafts of the drive shaft, the output shaft, and the rotating shaft of the generator. As long as the power is input / output to / from the remaining shafts based on the power input / output to / from the power source, any method may be used. 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 is the same as that of the embodiment described in the column of means for solving the problems. It is an example for specifically explaining the best mode for doing so, and does not limit the elements of the invention described in the column of means for solving the problems. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  The best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

  The present invention can be used in the vehicle manufacturing industry.

1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 according to an embodiment of the present invention. 2 is a configuration diagram showing an outline of a configuration of an engine 22. FIG. It is a flowchart which shows an example of the drive control routine performed by the hybrid electronic control unit 70 of an Example, when the shift lever 81 is set to a sequential shift position (S position). It is explanatory drawing which shows an example of the map for request | requirement torque setting. It is explanatory drawing which shows a mode that an example of the operating line of the engine 22, and temporary rotation speed Nettmp and temporary torque Tentmp are set. It is explanatory drawing which shows an example of the map for engine lower limit rotation speed setting. FIG. 3 is an explanatory diagram showing an example of a collinear diagram showing a dynamic relationship between the number of rotations and torque in a rotating element of a power distribution and integration mechanism 30 when traveling with power output from an engine 22; It is explanatory drawing explaining a mode that torque limitation Tm1min and Tm1max are set. It is explanatory drawing which shows an example of the map for a shift position setting. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 120 according to a modification. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 220 of a modified example.

Explanation of symbols

  20, 120, 220 Hybrid vehicle, 22 engine, 24 engine electronic control unit (engine ECU), 24a CPU, 24b ROM, 24c RAM, 26 crankshaft, 28 damper, 30 power distribution integration mechanism, 31 sun gear, 32 ring gear, 32a Ring gear shaft, 33 pinion gear, 34 carrier, 35 reduction gear, 40 electronic control unit for motor (motor ECU), 41, 42 inverter, 43, 44 rotational position detection sensor, 46 temperature sensor, 50 battery, 51 temperature sensor, 52 Battery electronic control unit (battery ECU), 54 power line, 60 gear mechanism, 62 differential gear, 63a, 63b, 64a, 64b wheels, 70 hybrid electronic control unit, 72 CP , 74 ROM, 76 RAM, 80 ignition switch, 81 shift lever, 82 shift position sensor, 83 accelerator pedal, 84 accelerator pedal position sensor, 85 brake pedal, 86 brake pedal position sensor, 88 vehicle speed sensor, 122 air cleaner, 124 throttle valve , 126 Fuel injection valve, 128 Intake valve, 130 Spark plug, 132 Piston, 134 Purification device, 135a Air-fuel ratio sensor, 135b Oxygen sensor, 136, Throttle motor, 138 Ignition coil, 140 Crank position sensor, 142 Water temperature sensor, 143 Pressure Sensor, 144 Cam position sensor, 146 Throttle valve position sensor, 148 Air flow meter, 149 Temperature sensor , 150 variable valve timing mechanism, 230 pair rotor motor, 232 inner rotor, 234 outer rotor, MG1, MG2 motor.

Claims (5)

An internal combustion engine;
Connected to the drive shaft connected to the axle and connected to the output shaft of the internal combustion engine so as to be rotatable independently of the drive shaft, and to the drive shaft and the output shaft with input and output of electric power and power Power power input / output means capable of power input / output;
An electric motor capable of outputting power to the drive shaft;
A power storage means capable of exchanging power with the electric power drive input / output means and the electric motor;
Motor temperature detecting means for detecting a motor temperature which is a temperature of the motor;
Vehicle speed detection means for detecting the vehicle speed;
Execution for setting one relationship as a vehicle speed lower limit rotation speed relationship among a plurality of vehicle speed lower limit rotation speed relationships preset as a relationship between the vehicle speed and the lower limit rotation speed of the internal combustion engine based on the shift operation of the operator Vehicle speed lower limit rotational speed relation setting means,
A required driving force setting means for setting a required driving force required for traveling;
When the detected motor temperature is a normal temperature lower than a predetermined temperature, the internal combustion engine is operated at a rotational speed equal to or higher than a lower limit rotational speed based on the detected vehicle speed and the set execution vehicle speed lower limit rotational speed relationship. The internal combustion engine, the electric power drive input / output means, and the electric motor are controlled to run with a driving force based on the set required driving force, and an operator is operated when the detected electric motor temperature is a high temperature that is equal to or higher than the predetermined temperature. Regardless of the shift operation, the lower limit rotational speed for the same vehicle speed tends to decrease as the detected motor temperature increases from the plurality of vehicle speed lower limit rotational speed relationships, and one vehicle speed lower limit rotational speed relationship is selected for execution. in the rotational speed more than the lower limit engine speed based on said detected vehicle speed and the selected and set the execution speed lower limit engine speed relationship and sets a vehicle speed lower limit engine speed relationship Serial control means for controlling said internal combustion engine and the electric power-mechanical power input output mechanism and the motor to travel by the driving force based on the set required driving force with the internal combustion engine is operated,
A vehicle comprising: An internal combustion engine;
Connected to the drive shaft connected to the axle and connected to the output shaft of the internal combustion engine so as to be rotatable independently of the drive shaft, and to the drive shaft and the output shaft with input and output of electric power and power Power power input / output means capable of power input / output;
An electric motor capable of outputting power to the drive shaft;
A power storage means capable of exchanging power with the electric power drive input / output means and the electric motor;
Motor temperature detecting means for detecting a motor temperature which is a temperature of the motor;
Vehicle speed detection means for detecting the vehicle speed;
Execution for setting one relationship as a vehicle speed lower limit rotation speed relationship among a plurality of vehicle speed lower limit rotation speed relationships preset as a relationship between the vehicle speed and the lower limit rotation speed of the internal combustion engine based on the shift operation of the operator Vehicle speed lower limit rotational speed relation setting means,
A required driving force setting means for setting a required driving force required for traveling;
When the detected motor temperature is a normal temperature lower than a predetermined temperature, the internal combustion engine is operated at a rotational speed equal to or higher than a lower limit rotational speed based on the detected vehicle speed and the set execution vehicle speed lower limit rotational speed relationship. The internal combustion engine, the electric power drive input / output means, and the electric motor are controlled to run with a driving force based on the set required driving force, and when the detected electric motor temperature is higher than the predetermined temperature, the detection is performed. The lower limit rotational speed restriction based on the set vehicle speed and the set execution vehicle speed lower limit rotational speed relation is released, and the internal combustion engine is operated and travels with a driving force based on the set required driving force. Control means for controlling the internal combustion engine, the electric power drive input / output means and the electric motor ;
A vehicle comprising: The power motive power input / output means is connected to three axes of a generator for inputting / outputting motive power, the drive shaft, the output shaft, and a rotating shaft of the generator, and enters any two of the three axes. vehicle according to claim 1 or 2 wherein the means for and a three shaft-type power input output assembly configured to input and output power from and to the remainder of the shaft based on the power output. Connected to the internal combustion engine and a drive shaft connected to the axle and connected to the output shaft of the internal combustion engine so as to be rotatable independently of the drive shaft, the drive shaft and the output with input and output of electric power and power Power power input / output means capable of inputting / outputting power to / from the shaft, an electric motor capable of outputting power to the drive shaft, and power storage means capable of exchanging electric power with the power power input / output means and the motor. A vehicle control method comprising:
(A) One relationship is set as the execution vehicle speed lower limit rotational speed relationship among a plurality of vehicle speed lower limit rotational speed relationships that are set in advance as the relationship between the vehicle speed and the lower limit rotational speed of the internal combustion engine based on the shift operation of the operator. And
(B) When the temperature of the electric motor is lower than a predetermined temperature, the internal combustion engine is operated at a rotational speed equal to or higher than a lower limit rotational speed based on a vehicle speed and the set execution vehicle speed lower limit rotational speed relationship, and a request required for traveling The internal combustion engine, the power power input / output means, and the electric motor are controlled so as to travel by the driving force based on the driving force, and when the temperature of the electric motor is equal to or higher than the predetermined temperature , the plurality of vehicle speed lower limits From the rotational speed relationship, one lower vehicle speed lower limit rotational speed relationship is selected so that the lower limit rotational speed for the same vehicle speed becomes smaller as the temperature of the electric motor becomes higher, and the vehicle speed and the selected speed are selected. the run by the driving force based on the front Kiyo determined driving force with the internal combustion engine is operated at a rotational speed equal to or higher than the lower limit rotation speed based on the running vehicle speed lower limit engine speed relationship set Te It said controlling the internal combustion engine and the electric power-mechanical power input output mechanism and said electric motor so as to,
A method for controlling a vehicle.   Connected to the internal combustion engine and a drive shaft connected to the axle and connected to the output shaft of the internal combustion engine so as to be rotatable independently of the drive shaft, the drive shaft and the output with input and output of electric power and power Power power input / output means capable of inputting / outputting power to / from the shaft, an electric motor capable of outputting power to the drive shaft, and power storage means capable of exchanging electric power with the power power input / output means and the motor. A vehicle control method comprising:
(A) One relationship is set as the execution vehicle speed lower limit rotational speed relationship among a plurality of vehicle speed lower limit rotational speed relationships that are set in advance as the relationship between the vehicle speed and the lower limit rotational speed of the internal combustion engine based on the shift operation of the operator. And
(B) When the temperature of the electric motor is lower than a predetermined temperature, the internal combustion engine is operated at a rotational speed equal to or higher than a lower limit rotational speed based on a vehicle speed and the set execution vehicle speed lower limit rotational speed relationship, and a request required for traveling The internal combustion engine, the power drive input / output means, and the electric motor are controlled so as to travel by the driving force based on the driving force. When the temperature of the electric motor is equal to or higher than the predetermined temperature, the vehicle speed is set to the set execution vehicle speed lower limit rotational speed relationship. Controlling the internal combustion engine, the power power input / output means, and the electric motor so that the internal combustion engine is operated with the driving force based on the required driving force while the restriction on the lower limit rotational speed is released.
  A method for controlling a vehicle.

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