WO2017094853A1

WO2017094853A1 - Hybrid vehicle and method for controlling same

Info

Publication number: WO2017094853A1
Application number: PCT/JP2016/085771
Authority: WO
Inventors: 堀井　裕介
Original assignee: いすゞ自動車株式会社
Priority date: 2015-12-04
Filing date: 2016-12-01
Publication date: 2017-06-08
Also published as: JP2017100639A

Abstract

A battery management system (39) is configured so as to send, to a control device (80), a limiting current value (Ia) for limiting a high-voltage battery (32). The control device (80) is configured so as perform control such that the respective output torques of an engine (10) and a motor-generator (31) are adjusted to meet respective target output torques (Te, Tm) calculated for each, the maximum value for the target output torque (Tm) of the motor-generator (31) being a predicted maximum output torque (Ta) calculated on the basis of the limiting current value (Ia), and in accordance with a predicted maximum chargeable/dischargeable power value (Pa) .

Description

Hybrid vehicle and control method thereof

The present disclosure relates to a hybrid vehicle and a control method thereof, and more particularly, to a hybrid vehicle and a control method thereof that avoid a situation in which an output torque output from a hybrid system is less than a required torque required for the hybrid system. .

2. Description of the Related Art In recent years, a hybrid vehicle (hereinafter referred to as “HEV”) including a hybrid system having an engine and a motor generator that are controlled in combination according to the driving state of the vehicle has been attracting attention from the viewpoint of improving fuel efficiency and environmental measures. ing. In this HEV, driving force is assisted by a motor generator when the vehicle is accelerated or started, while regenerative power generation is performed by the motor generator during inertial traveling or deceleration.

A device that limits the target output torque of the motor generator when the battery electrically connected to the motor generator is overdischarged or overcharged has been proposed (for example, see Patent Document 1).

In this device, the target torque of the motor generator was calculated by taking into account the amount of power consumed by an auxiliary device such as a DC / DC converter in addition to the amount of power that can be input and output based on the remaining capacity (SOC) of the battery and its temperature. When the allowable torque is exceeded, the target torque is limited to the calculated allowable torque. This suppresses overdischarge and overcharge of the battery and suppresses hunting (vibration) of the motor generator that occurs during overcharge / discharge of the battery.

The battery has a problem that the deterioration proceeds when the internal temperature exceeds a preset upper limit temperature. In this regard, the input / output current value and power value of the battery are limited so that the internal temperature of the battery does not exceed the upper limit temperature.

The target output torque of the engine and the motor generator is calculated based on the required torque obtained from the accelerator opening and the like. The above device does not consider the input / output limitation of the battery. For this reason, when the input / output of the battery is restricted, the output torque of the motor generator is reduced, resulting in a problem that the required torque cannot be obtained.

Japanese Unexamined Patent Publication No. 2005-218250

The purpose of the present disclosure is to prevent the output torque of the motor generator from reaching the target torque required for the motor generator, so that the output torque output from the hybrid system is higher than the required torque required for the hybrid system. It is an object of the present invention to provide a hybrid vehicle capable of avoiding a shortage and a control method thereof.

The hybrid vehicle of the present disclosure that achieves the above object includes a motor generator connected to an output shaft that transmits engine power, a battery electrically connected to the motor generator, and a battery management system that manages the battery. , A hybrid vehicle comprising an auxiliary device that consumes electric power charged in the battery, and a control device, the battery management system sets a limit value for limiting an input / output value of the battery. It is configured to calculate based on the state of the battery and transmit the limit value to the control device, and the control device calculates the battery and the motor generator calculated based on the transmitted limit value. Expected maximum power that can be charged and discharged between The estimated maximum output torque corresponding to the maximum value of the target output torque of the motor generator is used, and the output torque of each of the engine and the motor generator is calculated from the required torque required for the hybrid system and the engine The motor generator is configured to perform control to adjust to each target output torque of the motor generator.

In addition, the hybrid vehicle control method of the present disclosure that achieves the above-described object is a hybrid vehicle control method in which the output torque of each of the engine and the motor generator is adjusted to a target output torque calculated from the required torque. Obtaining a state; calculating a limit value of the input / output value of the battery based on the acquired state of the battery; limiting the input / output value of the battery to the limit value; Based on a limit value, calculating a predicted maximum power value that can be charged and discharged between the battery and the motor generator, calculating a predicted maximum output torque according to the predicted maximum power value, and the predicted The maximum output torque is the maximum value of the target output torque of the motor generator. Calculating a target output torque of each of the engine and the motor generator from the required torque, and adjusting each output torque of the engine and the motor generator to the target output torque. It is the method characterized by this.

The battery state can be exemplified by the remaining battery capacity (SOC) managed by the battery management system and the internal temperature of the battery.

Further, specific examples of the input / output values and limit values of the battery include current values and power values output from the battery or input to the battery.

This limit value is a value that is intentionally calculated by the battery management system based on the state of the battery, and is different from the input / output value as a characteristic that changes depending on the internal temperature of the battery. When the battery is discharged, this limit value decreases as it approaches full discharge. On the other hand, when charging the battery, it decreases as it approaches full charge. Further, this limit value is set so that the temperature of the battery does not exceed a preset upper limit temperature.

Further, examples of the auxiliary machine include a DC / DC converter, an electric air conditioner, and an electric hydraulic pump.

According to this hybrid vehicle and its control method, when the battery input / output value is limited to the limit value calculated by the battery management system, the predicted maximum output torque corresponding to the predicted maximum power value based on the limit value is obtained. The output torque of the engine and the motor generator is adjusted to achieve the required torque as the maximum value of the target output torque of the motor generator.

As a result, when the battery temperature exceeds the upper limit or the remaining capacity of the battery falls outside the target range, the output torque of the motor generator will not exceed the required torque even if the battery input / output is restricted. It can be avoided that the output torque becomes lower than the target output torque set to be achieved.

As a result, it is possible to avoid a situation in which the output torque output from the hybrid system is less than the required torque required for the hybrid system, so that drivability can be improved.

In particular, the hybrid vehicle and the control method thereof are preferably configured to calculate the predicted maximum power value from the input / output possible value calculated based on the limit value and the consumption value consumed by the auxiliary machine. In this way, by taking into account the amount of auxiliary equipment consumed in the predicted maximum power value, it is possible to reliably avoid that the output torque of the motor generator is lower than the target output torque, which improves drivability. Become advantageous.

Furthermore, it is desirable that the hybrid vehicle and the control method thereof are configured to calculate the predicted maximum output torque using the predicted maximum power value and the conversion efficiency according to the motor speed of the motor generator. As described above, the predicted maximum output torque can be calculated with high accuracy by converting the electric power and the mechanical output based on the conversion efficiency of the motor generator.

FIG. 1 is a configuration diagram of a hybrid vehicle according to an embodiment of the present disclosure. FIG. 2 is a flowchart illustrating control performed by the battery management system in the hybrid vehicle control method of the present disclosure. FIG. 3 is a flowchart illustrating control performed by the control device in the hybrid vehicle control method of the present disclosure. FIG. 4 is a flowchart illustrating step S110 in FIG. FIG. 5 is a flowchart illustrating step S120 of FIG. FIG. 6 is a characteristic diagram in which conversion efficiency based on the motor speed and torque in the motor generator is set.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. FIG. 1 illustrates a hybrid vehicle according to an embodiment of the present disclosure.

This hybrid vehicle (hereinafter referred to as “HEV”) is a vehicle including not only a normal passenger car but also a bus, a truck, etc., and has an engine 10 and a motor generator 31 that are controlled in combination according to the driving state of the vehicle. A hybrid system 30 is provided. The hybrid system 30 includes a high voltage battery 32 whose voltage is set to 24V or 48V as a battery, and a battery management system (hereinafter referred to as “BMS”) 39 for managing the high voltage battery 32. Yes.

In the engine 10, the crankshaft 13 is rotationally driven by thermal energy generated by the combustion of fuel in a plurality (four in this example) of cylinders 12 formed in the engine body 11. The engine 10 is a diesel engine or a gasoline engine. The rotational power of the crankshaft 13 is transmitted to the transmission 20 through a clutch 14 (for example, a wet multi-plate clutch) connected to one end of the crankshaft 13.

Rotational power changed by the transmission 20 is transmitted to the differential 23 through the propeller shaft 22 and distributed to the pair of driving wheels 24 as driving force.

The hybrid system 30 includes a motor generator 31, an inverter 35 that is electrically connected to the motor generator 31 in order, a high voltage battery 32 (for example, 48V), a DC / DC converter 33, and a low voltage battery 34 (for example, 12V). ).

Preferred examples of the high voltage battery 32 include a lithium ion battery, a nickel metal hydride battery, and a nickel cadmium battery. Examples of the low voltage battery 34 include a lead battery and an electric double layer capacitor. The DC / DC converter 33 has a function of controlling the charge / discharge direction and the output voltage between the high voltage battery 32 and the low voltage battery 34. The DC / DC converter 33 can supply power to various vehicle electrical components 36 from the high voltage battery 32 in addition to the low voltage battery 34.

Various parameters in the high voltage battery 32 of the hybrid system 30 such as internal temperature, current value, voltage value and remaining capacity (State of charge; SOC) are managed by a BMS (Battery Management System) 39. .

In this embodiment, the DC / DC converter 33 and the vehicle electrical component 36 are illustrated as auxiliary machines that consume the power of the high-voltage battery 32, but the auxiliary machines are electrically connected to the high-voltage battery 32. An electric air conditioner, an electric hydraulic pump, etc. can also be illustrated.

The motor generator 31 is an endless shape wound around a first pulley 15 attached to the rotating shaft 37 and a second pulley 16 attached to the other end of the crankshaft 13 which is an output shaft of the engine body 11. Power is transmitted to and from the diesel engine 10 via the belt-shaped member 17. Note that power can be transmitted using a gear box or the like instead of the two

pulleys

15 and 16 and the belt-like member 17. Further, the output shaft of the engine main body 11 connected to the motor generator 31 is not limited to the crankshaft 13, and may be a transmission shaft or the propeller shaft 22 between the engine main body 11 and the transmission 20, for example.

The motor generator 31 has a function of performing cranking instead of a starter motor (not shown) that starts the engine body 11.

These engine 10 and hybrid system 30 are controlled by a control device 80. Specifically, at the time of HEV start or acceleration, the hybrid system 30 assists at least a part of the driving force by the motor generator 31 supplied with power from the high voltage battery 32, while at the time of inertia traveling or braking. Performs regenerative power generation by the motor generator 31, converts surplus kinetic energy into electric power, and charges the high voltage battery 32.

In such HEV, the BMS 39 is configured to transmit the limited current value Ia calculated based on the state of the high voltage battery 32 to the control device 80. In addition, the control device 80 is configured to limit the current value Ix of the high-voltage battery 32 to the limit current value Ia and calculate the predicted maximum power value Pa based on the limit current value Ia. In addition, the control device 80 sets the predicted maximum output torque Ta corresponding to the predicted maximum power value Pa as the maximum value of the target output torque Tm of the motor generator 31 from the required torque Tt required for the hybrid system 30 to the engine 10 and Each of the target output torques Te and Tm of the motor generator 31 is calculated. The control device 80 is configured to perform control to adjust the output torques of the engine 10 and the motor generator 31 to the calculated target output torques Te and Tm, respectively.

The BMS 39 includes a CPU that performs various processes, an internal storage device that can read and write programs and processing results used to perform the various processes, and various sensors. Examples of the sensor include a sensor that detects the current value of the high-voltage battery 32 and a sensor that detects the internal temperature.

The BMS 39 stores a plurality of execution programs in an internal storage device. As these execution programs, a program for estimating the remaining capacity Cx of the high voltage battery 32 and a limit current value Ia of the high voltage battery 32 are calculated. A program and a program for estimating the voltage value Vx of the high voltage battery 32 can be exemplified.

The program for calculating the limited current value Ia of the high voltage battery 32 is a part of the HEV control method. This program will be described below as a function of the BMS 39 with reference to the flowchart of FIG. This program is executed every predetermined time.

First, in step S10, the BMS 39 acquires the internal temperature θx and the remaining capacity Cx of the high voltage battery 32 by a sensor (not shown).

Next, in step S20, the BMS 39 calculates a limit current value Ia and an estimated voltage value Va estimated when the limit current value Ia is input and output based on the acquired state of the high voltage battery 32.

The limited current value Ia is a current value intentionally limited by the BMS 39 based on the state of the high voltage battery 32. That is, it is different from the current value Ix as a characteristic that varies depending on the internal temperature θx of the high voltage battery 32 and the remaining capacity Cx.

The limit current value Ia is calculated based on the map data in which the limit current value Ia based on the internal temperature θx is set and the map data in which the limit current value Ia based on the remaining capacity Cx is set. These map data are created in advance by experiments and tests and stored in the internal storage device.

More specifically, the limited current value Ia is set so that the internal temperature θx of the high-voltage battery 32 does not exceed a preset upper limit temperature θa. The upper limit temperature θa is set to a temperature at which the deterioration of the high-voltage battery 32 proceeds, and can range from 55 ° C. to 60 ° C.

Further, the limit current value Ia is set so that the remaining capacity Cx of the high voltage battery 32 becomes smaller as it approaches the lower limit value Cmin and the upper limit value Cmax of the preset target range. The target range is an appropriate operation range determined in advance by experiments and tests. When the remaining capacity Cx is outside this target range, the high-voltage battery 32 deteriorates. As the target range, when the full charge is 100% and the full discharge is 0%, the lower limit value is 15% or more and 25% or less, and the upper limit value is 75% or more and 85% or less.

Next, in step S30, the BMS 39 transmits the limit current value Ia and the estimated voltage value Va estimated when the limit current value Ia is input / output to the control device 80, and returns to the start. Then, the above steps S10 to S30 are performed every predetermined time.

Thus, since the BMS 39 calculates the limiting current value Ia that limits the input / output of the high voltage battery 32 according to the state of the high voltage battery 32, the progress of deterioration of the high voltage battery 32 can be suppressed. This is advantageous for improving durability.

In this embodiment, a configuration in which the current value Ix is used as the input / output value of the high-voltage battery 32 and the limited current value Ia is used as the limit value will be described as an example. You may make it the structure which uses a power limit value.

In this embodiment, the internal temperature θx and the remaining capacity Cx are acquired as the state of the high-voltage battery 32. However, the rate of increase and the degree of deterioration of the internal temperature θx may be acquired. In that case, map data in which the limit current value Ia is set for each of them is created, and the limit current value Ia is calculated from the map data.

The control device 80 includes a CPU that performs various processes, an internal storage device that can read and write programs and processing results used to perform the various processes, and various interfaces.

The control device 80 is connected to the BMS 39 of the hybrid system 30 via a signal line. The control device 80 is connected to an accelerator opening sensor 96 that detects the amount of depression of the accelerator pedal 95 (accelerator opening) via a signal line.

The control device 80 stores a plurality of execution programs in an internal storage device. Examples of the execution programs include a program for limiting the current value Ix of the high voltage battery 32 to the limit current value Ia, and an accelerator opening sensor 96. A program for calculating the target output torque Te of the engine 10 and the target output torque Tm of the motor generator 31 based on the detected accelerator opening, and adjusting the output torque of the engine 10 and the motor generator 31 to the respective target output torques Te and Tm. Can be illustrated.

This program is a part of the HEV control method, and becomes the HEV control method together with the BMS 39 program described above. This program will be described below as a function of the control device 80 with reference to the flowcharts of FIGS. In addition, this control method shall be performed for every predetermined time.

First, in step S100, the control device 80 receives the limited current value Ia and the estimated voltage value Va transmitted from the BMS 39. Next, in step S110, the control device 80 limits the current value Ix of the high voltage battery 32 to the limit current value Ia. Depending on the state of the high voltage battery 32, the limited current value Ia may be equal to the current value Ix as a characteristic.

Next, in step S120, the control device 80 calculates the predicted maximum power value Pa based on the limited current value Ia and the estimated voltage value Va. The predicted maximum power value Pa is preferably calculated based on the input / output possible current value Ic that can be charged / discharged between the high voltage battery 32 and the motor generator 31.

Therefore, in step S120, the control device 80 monitors the current consumption value Ib of the high voltage battery 32 consumed by the auxiliary equipment such as the DC / DC converter 33 and the vehicle electrical equipment 36, and the limit current value Ia and its consumption are monitored. It is desirable to calculate the predicted maximum power value Pa from the input / output possible current value Ic based on the current value Ib.

Details of step S120 are shown in FIG. First, in step S122, the control device 80 acquires a current consumption value Ib consumed by auxiliary equipment such as the DC / DC converter 33 and the vehicle electrical component 36. In step S122, the control device 80 acquires the consumption current value Ib from the operating state of the DC / DC converter 33, a sensor that detects the current value between the high voltage battery 32 and the DC / DC converter 33, and the like. The current consumption value Ib may be calculated by predicting the operating state of auxiliary equipment such as the DC / DC converter 33 and the vehicle electrical component 36. In this embodiment, an example in which the current consumption value Ib is used as the consumption value will be described. However, the power consumption value consumed by the auxiliary machine may be acquired as the consumption value.

Next, in step S124, the control device 80 calculates an input / output possible current value Ic based on the limited current value Ia and the consumed current value Ib. The input / output possible current value Ic is a current value that can be output from the high voltage battery 32 to the motor generator 31 or a current value that can be input from the motor generator 31 to the high voltage battery 32. Therefore, the input / output possible current value Ic is a value obtained by subtracting the consumption current value Ib from the limit current value Ia when the motor generator 31 is driven, and is consumed to the limit current value Ia when the motor generator 31 is regenerated. A value obtained by adding the current value Ib. In this embodiment, an example in which the input / output possible current value Ic is used as the input / output possible value will be described. However, the input / output power value may be calculated as the input / output possible value.

Next, in step S126, the control device 80 multiplies the input / output possible current value Ic by the estimated voltage value Va to calculate the predicted maximum power value Pa, and proceeds to step S130.

The expected maximum power value Pa is the maximum power value that can be output from the high voltage battery 32 to the motor generator 31 or can be input from the motor generator 31 to the high voltage battery 32. Therefore, in this way, in addition to the predicted maximum power value Pa, in addition to the limited current value Ia, the current consumption value Ib consumed by the auxiliary equipment such as the DC / DC converter 33 and the vehicle electrical component 36 is actually added. Electric power that can be used by the motor generator 31 can be accurately calculated.

Next, as shown in FIG. 3, in step S130, the control device 80 calculates the predicted maximum output torque Ta based on the predicted maximum power value Pa. The predicted maximum output torque Ta is preferably calculated based on the highest conversion efficiency ηm having the highest efficiency among the conversion efficiencies.

Therefore, in this step S130, it is desirable that the control device 80 calculates the predicted maximum output torque Ta using the maximum conversion efficiency ηm according to the predicted maximum power value Pa and the motor rotation speed Nm of the motor generator 31.

Details of step S130 are shown in FIG. First, in step S <b> 132, the control device 80 acquires the motor rotation speed Nm of the motor generator 31. The motor rotation speed Nm is a predicted value, and based on the HEV vehicle speed, the rotation speed of the propeller shaft 22, and the rotation speed of the crankshaft 13 (engine rotation speed Ne), the first pulley 15, the second pulley 16, and the belt shape It is calculated in consideration of the transmission efficiency of the member 17.

Next, in step S134, the control device 80 calculates the maximum conversion efficiency ηm according to the predicted maximum power value Pa and the predicted motor rotation speed Nm. This maximum conversion efficiency ηm is the efficiency at the time of converting a power value, which is electrical energy, into torque, which is mechanical energy.

FIG. 6 is a characteristic diagram in which conversion efficiency based on the motor rotation speed Nm, output torque, and regenerative torque in the motor generator 31 is set. The conversion efficiency is illustrated by a one-dot chain line, and the efficiency is set to be lower from the concentric circle toward the outside.

When the maximum output torque Tmax based on the motor rotation speed Nm is output and the predicted maximum power value Pa is reached, setting the maximum output torque Tmax to the predicted maximum output torque Ta is wasteful because conversion efficiency is low. Energy will be consumed. Therefore, in this step S134, it is preferable that the control device 80 calculates the highest conversion efficiency ηm with the highest efficiency with reference to a characteristic diagram created in advance by experiments and tests and stored in the internal storage device. Thus, driving and regenerating the motor generator 31 with the maximum conversion efficiency ηm can suppress energy loss, which is advantageous for improving fuel efficiency.

Next, in step S136, the control device 80 calculates the predicted maximum output torque Ta based on the maximum conversion efficiency ηm, and proceeds to step S140.

Next, as shown in FIG. 3, in step S140, the control device 80 calculates the required torque Tt of the hybrid system 30 based on the accelerator opening, and each of the engine 10 and the motor generator 31 based on the required torque Tt. Target output torques Te and Tm are calculated. In this step S140, HEV vehicle speed, vehicle weight, travel road gradient, gear stage of the transmission 20, and the like may be taken into consideration.

Next, in step S150, the control device 80 determines whether or not the target output torque Tm of the motor generator 31 is larger than the predicted maximum output torque Ta. If it is determined in step S150 that the target output torque Tm is larger than the predicted maximum output torque Ta, the process proceeds to step S160. On the other hand, if it is determined that the target output torque Tm is equal to or less than the predicted maximum output torque Ta, the process proceeds to step S170.

Next, in step S160, the control device 80 corrects the target output torques Te and Tm with the predicted maximum output torque Ta as the maximum value of the target output torque Tm of the motor generator 31. For example, when the target output torque Tm is larger than the predicted maximum output torque Ta, a difference obtained by setting the predicted maximum output torque Ta to the maximum value is added to the target output torque Te of the engine 10.

Next, in step S170, the control device 80 adjusts the output torques of the engine 10 and the motor generator 31 to the calculated target output torques Te and Tm, respectively. When step S170 is completed, the process returns to the start.

By performing the control as described above, the internal temperature θx of the high voltage battery 32 exceeds the upper limit temperature θa, or the remaining capacity Cx of the high voltage battery 32 is out of the target range. Even if the input / output of the high-voltage battery 32 is restricted, it is possible to avoid the output torque of the motor generator 31 being lower than the target output torque Tm.

As a result, it is possible to avoid a situation in which the output torque output from the hybrid system 30 is less than the required torque Tt required for the hybrid system 30, so that drivability can be improved.

In addition, when the motor generator 31 is regenerated, the amount of regeneration can be increased by considering the current consumption value Ib consumed by the auxiliary machine.

In particular, by taking into account the amount of auxiliary equipment consumed in the predicted maximum power value Pa, it is possible to reliably avoid the output torque of the motor generator 31 being lower than the target output torque Tm, so that drivability is improved. To be advantageous.

Furthermore, by calculating the maximum conversion efficiency ηm, it is possible to suppress a loss of useless energy, which is advantageous for improving fuel consumption.

In this embodiment, the BMS 39 calculates the limit current value Ia and the control device 80 has been described as an example of a configuration in which the current value Ix of the high voltage battery 32 is limited to the limit current value Ia. However, the BMS 39 directly The current value Ix of the high voltage battery 32 may be limited to the limit current value Ia.

This application is based on a Japanese patent application (Japanese Patent Application No. 2015-237237) filed on December 4, 2015, the contents of which are incorporated herein by reference.

The present invention has an effect that the output torque output from the hybrid system can avoid a situation where the required torque required for the hybrid system is insufficient, and is useful for a hybrid vehicle and a control method thereof. .

10 Engine 30 Hybrid System 31 Motor Generator 32 High Voltage Battery 33 DC / DC Converter 36 Vehicle Electrical Equipment 39 BMS (Battery Management System)
80 Control device Ia Limit current value Pa Expected maximum power value Ta Expected maximum output torque Te, Tm Target output torque

Claims

A hybrid system having a motor generator connected to an output shaft for transmitting engine power, a battery electrically connected to the motor generator, and a battery management system for managing the battery, and the battery charged In a hybrid vehicle including an auxiliary machine that consumes electric power and a control device,
The battery management system is
A limit value for limiting the input / output value of the battery is calculated based on the state of the battery,
Configured to transmit the calculated limit value to the control device;
The control device is
Based on the limit value transmitted from the battery management system, to calculate the expected maximum output torque according to the expected maximum power value that can be charged and discharged between the battery and the motor generator,
With the predicted maximum output torque as the maximum value of the target output torque of the motor generator, the target output torque of each of the engine and the motor generator is calculated from the required torque required for the hybrid system,
A hybrid vehicle configured to perform control to adjust output torques of the engine and the motor generator to the calculated target output torques.
The control device is configured to monitor a consumption value of the battery consumed by the auxiliary device and calculate the predicted maximum power value from an input / output possible value based on the limit value and the consumption value. Item 2. The hybrid vehicle according to Item 1.
3. The control device according to claim 1, wherein the control device is configured to calculate the predicted maximum output torque using a conversion efficiency calculated based on the predicted maximum power value and a motor rotation speed of the motor generator. Hybrid vehicle.
The hybrid vehicle according to any one of claims 1 to 3, wherein the limit value is set such that an internal temperature of the battery is equal to or lower than a preset upper limit temperature.
In the hybrid vehicle control method of adjusting the output torque of each of the engine and the motor generator to the target output torque calculated from the required torque,
Obtaining a state of a battery electrically connected to the motor generator;
Calculating a limit value of the input / output value of the battery based on the acquired state of the battery;
Limiting the input / output value of the battery to the calculated limit value;
Calculating an expected maximum power value that can be charged and discharged between the battery and the motor generator based on the limit value;
Calculating a predicted maximum output torque according to the predicted maximum power value;
Calculating the target output torque of each of the engine and the motor generator from the required torque with the predicted maximum output torque as the maximum value of the target output torque of the motor generator;
Adjusting the output torque of each of the engine and the motor generator to the target output torque of the engine and the motor generator, respectively.
The hybrid vehicle control method further includes:
After the step of calculating the target output torque, determining whether the target output torque of the motor generator is greater than the predicted maximum output;
When it is determined in the determining step that the target output torque of the motor generator is larger than the predicted maximum output, the predicted maximum output is set as the maximum value of the target output torque of the motor generator, and the motor generator Adding the difference between the target output torque and the predicted maximum output to the target output torque of the engine;
The method for controlling a hybrid vehicle according to claim 5, further comprising: