JP2003299210A - Hybrid vehicle driving and controlling device, control method of hybrid vehicle driving device, and program thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To not only reduce the weight of a hybrid vehicle but also to lower its cost. <P>SOLUTION: This device comprises: a first battery; a second battery; a voltage converting member that convents voltages between a first power source voltage of the first battery and a second power source one of the second battery; a battery environments detecting part that detects battery environments; and an electric power transfer processing means 91 that transfers electric power from one battery to the other when a prescribed battery of the first and second batteries is put under prescribed environments. In this structure, when a prescribed battery of the first and the second batteries is put under prescribed environments, the electric power is transferred from one battery to the other so that the other battery can sufficiently be discharged. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hybrid vehicle drive control device, a hybrid vehicle drive device control method, and a program thereof.

[0002]

2. Description of the Related Art Conventionally, a motor is directly connected to a crankshaft of an engine, the motor is driven to start the engine, or the torque generated by the motor, that is,
There is provided a hybrid vehicle in which motor torque is transmitted to driving wheels.

In the hybrid type vehicle, a vehicle drive device is provided for driving the engine, the motor, etc., and a main battery as a first battery serving as a power source for supplying electric power to the motor. , And an auxiliary machine of a hybrid type vehicle, for example, an auxiliary machine battery as a second battery serving as a power source for supplying electric power to electric components.

The motor is driven by receiving a direct current from the main battery during power running (driving) to generate the motor torque, and receives the regenerative torque by the inertia of the hybrid vehicle during regeneration (power generation). , DC current is generated and the current is supplied to the main battery and the auxiliary battery.

By the way, as the main battery, for example, a nickel-hydrogen storage battery capable of electrochemically absorbing and desorbing hydrogen as an active material by using nickel oxide for the positive electrode and hydrogen storage alloy for the negative electrode is used. When used, if the main battery is placed in an extremely low temperature, it becomes difficult for the nickel-hydrogen storage battery to store and release hydrogen, and the characteristics are extremely deteriorated.

[0006] Therefore, in a hybrid type vehicle equipped with a battery, such as the nickel-metal hydride storage battery, whose characteristics deteriorate at extremely low temperatures as a main battery,
Even if the engine is started at an extremely low temperature, a sufficient amount of electric power (hereinafter referred to as "battery discharge electric power") cannot be supplied from the main battery to the motor, which makes it difficult to start the engine.

Therefore, in addition to the motor, a starter for starting the engine at a very low temperature is mounted on a hybrid type vehicle to drive the starter based on the current supplied from the auxiliary battery, lead acid battery or the like. It is possible to start the engine by using a battery whose characteristics do not deteriorate at extremely low temperatures as described above as the main battery.

FIG. 2 is a diagram showing the characteristics of the nickel-hydrogen storage battery and the lead storage battery. In the figure, the horizontal axis represents the temperature tmB of the main battery and the vertical axis represents the battery discharge power.

In the figure, Ln1 is a line showing an example of characteristics of a nickel-hydrogen storage battery, and Ln2 is a line showing an example of characteristics of a lead storage battery. As shown in the figure, the lines Ln1 and Ln2
Intersect at a point Pc, and the battery temperature tmB is equal to the point Pc.
, The battery discharge power Pb1 of the nickel-hydrogen storage battery is larger than the battery discharge power Pb2 of the lead storage battery, and when the battery temperature tmB has the value Tc, the battery discharge powers Pb1 and Pb2 are equal, and the battery temperature tmB. Is less than the value Tc, the battery discharge power Pb1 of the nickel-hydrogen storage battery is smaller than the battery discharge power Pb2 of the lead storage battery.

[0010]

However, in the above-mentioned conventional hybrid type vehicle, when the starter for starting the engine at a very low temperature is mounted, the weight of the hybrid type vehicle is increased because the starter is mounted. Not only that, but the cost of the hybrid vehicle increases.

Further, when the lead storage battery is mounted as the main battery, the lead storage battery has a shorter life than the nickel-hydrogen storage battery, so that the main battery needs to be replaced frequently, which increases the cost of the hybrid vehicle. And
Due to the low output density of lead-acid batteries, the power performance during acceleration is lower than that of nickel-hydrogen batteries. Therefore, in order to obtain the same power performance as that of the nickel-hydrogen storage battery, it is necessary to mount a lead storage battery having a power capacity larger than that of the nickel-hydrogen storage battery, and the weight of the hybrid vehicle increases.

The present invention solves the above-mentioned problems of the conventional hybrid type vehicle so that the weight of the hybrid type vehicle can be reduced and the cost of the hybrid type vehicle can be reduced. An object of the present invention is to provide a control device, a method for controlling a hybrid vehicle drive device, and a program thereof.

[0013]

Therefore, in the hybrid vehicle drive control device of the present invention, a first battery, a second battery, and a first battery of the first battery are provided.
Voltage conversion member that converts a voltage between the power supply voltage of the second battery and the second power supply voltage of the second battery, a battery environment detection unit that detects the battery environment, and a predetermined one of the first and second batteries. And a power transfer processing unit that transfers power from one battery to another when the battery is placed under a predetermined battery environment.

In another hybrid type vehicle drive control device of the present invention, the battery environment is a temperature of a predetermined battery of the first and second batteries.

In still another hybrid vehicle drive control device of the present invention, the predetermined battery environment is extremely low temperature.

In still another hybrid vehicle drive control device of the present invention, the first battery further comprises:
It is a main battery that serves as a power source for supplying electric power to the motor. The second battery is an auxiliary battery that serves as a power source for supplying electric power to the auxiliary device.

In still another hybrid type vehicle drive control device of the present invention, the chemical reaction during charging of the other battery is an exothermic reaction.

In the control method for the hybrid vehicle drive system according to the present invention, the first battery, the second battery,
And a hybrid vehicle drive device including a voltage conversion member that converts a voltage between the first power supply voltage of the first battery and the second power supply voltage of the second battery.

Then, the battery environment is detected, and when a predetermined battery of the first and second batteries is placed under the predetermined battery environment, electric power is transferred from one battery to the other battery. .

In the program of the control method for the hybrid vehicle drive device according to the present invention, the first battery and the second battery are included.
Of a battery, a voltage conversion member that converts a voltage between a first power supply voltage of the first battery and a second power supply voltage of the second battery, and a battery environment detection unit that detects a battery environment The invention is applied to a method for controlling a type vehicle drive device.

[0021] Then, the computer is controlled by the first and second
When a predetermined battery among the above batteries is placed under a predetermined battery environment, it is caused to function as a power transfer processing unit that transfers power from one battery to the other battery.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a functional block diagram of a hybrid type vehicle drive control device according to an embodiment of the present invention.

In the figure, 43 is a main battery as a first battery, 45 is an auxiliary battery as a second battery, 48 is a first power supply voltage of the main battery 43 and a second battery of the auxiliary battery 45. A DC / DC converter as a voltage conversion member that converts the voltage between the power supply voltage and the power supply voltage, a battery temperature sensor 63 as a battery environment detection unit that detects the temperature of the main battery 43 as the battery environment, 91
Is a power transfer processing unit that transfers power from one battery to the other battery when the main battery 43 of the main battery 43 and the auxiliary battery 45 is placed at a predetermined temperature.

FIG. 3 is a schematic diagram showing a main part of the vehicle drive device according to the embodiment of the present invention.

In the figure, 12 is a crankshaft connected to an engine (not shown), 13 is a drive plate, 14 is a torque converter as a fluid transmission device, 2
Reference numeral 5 is a motor as an electric machine directly connected to the crankshaft 12, and 15 is a center piece of the torque converter 14. The torque converter 14 is provided with the center piece 15, a front cover 16 connected to the center piece 15, a pump impeller 17 connected to the front cover 16, and a pump impeller 17 that faces the pump impeller 17. Together with a turbine runner 21, a stator 22, and a torus that are connected to an input shaft 19 of the transmission via a turbine hub 18.
A lock-up clutch device 23 that is disengageably disposed,
And a damper device 24 that absorbs the torque transmitted between the pump impeller 17 and the turbine hub 18, that is, the fluctuation of the transmitted torque.

In the torque converter 14, the rotation transmitted from the engine is transmitted to the front cover 16 via the crankshaft 12 and the center piece 15, and is transmitted to the pump impeller 17 fixed to the front cover 16. To be done. In this case, when the pump impeller 17 rotates, the oil in the torus flows around the shaft of the torque converter 14, and centrifugal force is applied to the pump impeller 17, the turbine runner 21, and the stator 22.
The turbine runner 21 is circulated through the space and the rotation is transmitted to the input shaft 19.

When the pump impeller 17 has just started to rotate and the difference in rotational speed between the pump impeller 17 and the turbine runner 21 is large, such as when the hybrid vehicle is started, the turbine runner 21 flows out. The oil flows in a direction that hinders the rotation of the pump impeller 17. Therefore, the pump impeller 17 and the turbine runner 21
And the stator 22 is disposed between
Converts the flow of oil in a direction that assists the rotation of the pump impeller 17 when the rotational speed difference between the pump impeller 17 and the turbine runner 21 is large.

When the rotational speed of the turbine runner 21 increases and the rotational speed difference between the pump impeller 17 and the turbine runner 21 decreases, the stator 2
The oil hitting the front side of the blade of No. 2 hits the back side and the flow of the oil is obstructed. Therefore, in order to allow the stator 22 to rotate only in a fixed direction, a one-way clutch F is arranged on the inner peripheral side of the stator 22. Therefore, when the oil hits the back side of the blade, the stator 22 is naturally rotated by the one-way clutch F, so that the oil circulates smoothly.

When the preset vehicle speed is obtained after the hybrid vehicle has started, the lockup clutch device 23 is engaged, and the rotation of the engine is directly applied to the input shaft 19 without passing oil. Transmitted.

By the way, the motor 25 includes a stator 28 fixed to a vehicle drive unit case 26 and the stator 2.
8 includes a rotor 31 centered on the center piece 15 and disposed rotatably inward in the radial direction from 8, and the stator 28 includes a stator core 32 and a coil 33 wound around the stator core 32. The rotor 31 includes a rotor core 34 and permanent magnets (not shown) arranged at a plurality of positions in the circumferential direction of the rotor core 34. Reference numeral 35 is a plate for sandwiching the rotor core 34 and the permanent magnet.

The rotor 31 is centered on the center piece 15 via a rotor hub 36, and the rotor hub 36 is attached to the front cover 16 by a bolt bt1.
And the annular plate 38 and the bolt b.
It is connected to the drive plate 13 via t2.

FIG. 4 is a schematic diagram of a hybrid type vehicle drive control device in the embodiment of the present invention, and FIG. 5 is a schematic diagram showing a main part of the hybrid type vehicle drive control device in the embodiment of the present invention.

In the figure, 11 is an engine, 12 is a crankshaft, 14 is a torque converter, 25 is a motor, 29 is an inverter as a motor inverter for driving the motor 25, 37 is a driving wheel, and 41 is the torque. A transmission 43, which is connected to the motor 25 and the engine 11 via the converter 14 and changes the rotation output from the torque converter 14 at a predetermined gear ratio, supplies electric power to the motor 25 when the hybrid vehicle is driven. A main battery serving as a first battery serving as a power source for operating the auxiliary battery of the hybrid vehicle, for example, an auxiliary battery serving as a second battery serving as a power source for supplying electric power to electric components (not shown). is there.

The inverter 29 includes a main relay 47 as a power relay and DC cables CB1 and CB2.
Connected to the main battery 43 via the
DC current is supplied from. In addition, the main battery 4
3 is a main relay 47, DC cables CB1 and CB
2 and the DC / DC converter 48 as a voltage conversion member via the DC cables CB3 and CB4 branched from the DC cables CB1 and CB2.
The converter 48 and the auxiliary battery 45 are connected.

As the main battery 43, a nickel-hydrogen storage battery which uses nickel oxide for the positive electrode and a hydrogen storage alloy for the negative electrode and which can electrochemically store and release hydrogen as an active material is used. A lead storage battery is used as the auxiliary battery 45. Further, as the electric component,
Lighting items, control parts, air conditioners, etc. are used.

In the present embodiment, the main battery 4
The voltage as the first power supply voltage in No. 3 is 42 [V], the voltage as the second power supply voltage in the auxiliary battery 45 is 12 [V], and the DC / DC converter 48 is 42 [V]. The voltage of V] is converted into the voltage of 12 [V], or the voltage of 12 [V] is converted into the voltage of 42 [V]. Further, a switch 56 is arranged in the DC / DC converter 48, and by turning the switch 56 on and off, the DC / DC converter 48 is operated or the operation of the DC / DC converter 48 is stopped. be able to.

On the inlet side of the inverter 29, a voltage sensor 76 as a DC voltage detecting section is provided for detecting the DC voltage applied to the inverter 29, that is, the motor inverter voltage VM as the inverter voltage.
The inverter 2 is provided at a predetermined position of the DC cable CB2.
9 for detecting a direct current supplied to the motor 9, that is, a motor inverter current IM, and for detecting a direct current supplied to the main battery 43 during regeneration, that is, a battery current Ib. The current sensor 78 is provided. Then, the motor inverter voltage VM is transmitted to the vehicle control device 51 by the motor inverter current IM.
And the battery current Ib is sent to the motor control device 49. A smoothing capacitor C is connected between the main battery 43 and the inverter 29.

The vehicle control device 51 is composed of a CPU, a recording device and the like (not shown), controls the entire vehicle drive device, and functions as a computer based on a predetermined program, data and the like. The vehicle control device 51
Is connected to the engine control device 46, the motor control device 49, and the automatic transmission control device 52. The engine control device 46 is composed of a CPU, a recording device, and the like (not shown), and in order to control the engine 11, command signals such as throttle opening θ and valve timing are sent to the engine 1.
Send to 1. Further, the motor control device 49 is composed of a CPU, a recording device and the like (not shown), and sends a drive signal to the inverter 29 in order to control the motor 25. The automatic transmission control device 52 has a C (not shown).
It comprises a PU, a recording device, etc., and sends various signals such as solenoid signals to the transmission 41 in order to control the automatic transmission. The solenoid signal is generated for each shift stage, and when a solenoid signal corresponding to a predetermined shift stage is sent to the transmission device 41, the shift device 41 achieves the shift stage. Gear shifting is performed. In addition,
An MPU or the like may be used instead of the CPUs.

The engine control device 46, the motor control device 49, and the automatic transmission control device 52 make a first control device, and the vehicle control device 51 makes a second control device higher than the first control device. Is configured. Further, the engine control device 46 and the motor control device 4
9 and the automatic transmission control device 52, like the vehicle control device 51, function as a computer based on a predetermined program, data, and the like.

The inverter 29 is driven according to the drive signal, receives a direct current from the main battery 43 during power running, generates currents IMU, IMV, IMW of respective phases, and outputs the currents IMU, IMV, IMW to the motor. 25, and the current IMU, IMV, IM from the motor 25 during regeneration.
Upon receiving W, a direct current is generated and supplied to the main battery 43.

Reference numeral 44 indicates the state of the main battery 43, that is, the remaining battery amount SO in the battery state.
A battery remaining amount detecting device for detecting C, 53 is a position of a shift lever (not shown) as a gear shift operating portion, that is,
A shift position sensor for detecting the shift position SP, 55 is a position (depression amount) of an accelerator pedal (not shown), that is, an accelerator switch as an engine load detecting unit and an accelerator operation detecting unit for detecting the accelerator pedal position AP, and 62 is not shown. The position of the brake pedal (depression amount), that is, a brake switch as a brake operation detection unit that detects the brake pedal position BP,
63 indicates the temperature tmB of the main battery 43 as a battery environment.
It is a battery temperature sensor as a temperature detection unit for detecting the temperature. The battery temperature sensor 63 constitutes a battery environment detection unit. The battery remaining amount SOC and the temperature t
The mB is sent to the vehicle control device 51. In addition, the load on the engine 11 by the accelerator pedal position AP,
That is, the engine load is represented.

68 and 69 are currents IM, respectively.
U, a current sensor as an alternating current detection unit for detecting IMV, 72 is a battery voltage VB as the battery state
Is a battery voltage sensor as a voltage detection unit for the main battery 43 that detects The battery voltage VB is sent to the vehicle control device 51, and the currents IMU, IMV are sent to the motor control device 49 and the vehicle control device 51.

The vehicle control device 51 sends an engine control signal to the engine control device 46, and causes the engine control device 46 to set driving / stopping of the engine 11. Further, a vehicle speed calculation processing means (not shown) of the vehicle control device 51 performs vehicle speed calculation processing, reads the position of the rotor 31 (FIG. 3) of the motor 25, that is, the rotor position, and calculates the rate of change of the rotor position. The vehicle speed V is calculated based on the rate of change and the gear ratio in the torque transmission system from the center piece 15 to the drive wheels 37.

Then, the vehicle control device 51 uses the engine 1
1 rotation speed, that is, target of engine rotation speed NE
Target engine speed NE that represents the value^*, And motor
Motor target torque TM representing the target value of TM^*The set
And engine target speed NE ^*The engine control unit 4
6. Motor target torque TM^*To the motor controller 49
send. In the present embodiment, the motor 25 is
Used as a starter to start the engine 11
It is designed to be used as a generator,
The throttle opening θ of the engine 11 changes and the engine
It can be used as an auxiliary drive source when Luke TE fluctuates.
I can do it.

Next, the operation of the motor control device 49 will be described. In this case, the motor control device 49 performs feedback control by vector control calculation on a dq axis model in which the d axis is taken in the direction of the magnetic pole pair of the rotor 31 and the q axis is taken in the direction perpendicular to the d axis. To do.

First, a motor rotation speed calculation processing means (not shown) of the motor control device 49 performs a motor rotation speed calculation process, reads the rotor position, and calculates the change rate of the rotor position to calculate the rotation speed of the motor 25. ,
That is, the motor rotation speed NM is calculated.

Subsequently, the motor controller 49 is not shown.
The motor control processing means for performing motor control processing
Target torque TM^*And read the battery voltage VB,
The motor rotation speed NM and the motor target torque TM^*as well as
On the basis of the battery voltage VB, the motor control device 49
The electric motor (not shown) for controlling the motor recorded in the recording device of
Flow command value map, d-axis current command value IMd^*as well as
q-axis current command value IMq ^*Is calculated and determined.

Further, the motor control processing means reads the currents IMU and IMV from the current sensors 68 and 69 and calculates the current IMW IMW = IMU-IMV based on the currents IMU and IMV. The current IMW can be detected by a current sensor as well as the currents IMU and IMV.

Subsequently, the alternating current calculation processing means of the motor control processing means performs alternating current calculation processing to calculate the d-axis current IMd and the q-axis current IMq which are alternating currents. Therefore, the alternating current calculation processing means has three phases /
Two-phase conversion is performed to convert the currents IMU, IMV, IMW into a d-axis current IMd and a q-axis current IMq. Then, the AC voltage command value calculation processing means of the motor control processing means,
AC voltage command value calculation processing is performed, and the d-axis current IMd and the q-axis current IMq, and the d-axis current command value IMd ^*.
And the voltage command value V based on the q-axis current command value IMq ^*
Calculate Md ^* and VMq ^* . Further, the motor control processing means performs a two-phase / 3-phase conversion to obtain a voltage command value VM.
d ^* , VMq ^* are voltage command values VMU ^* , VMV ^* , VM
Converted to W ^* , and the voltage command values VMU ^* , VMV ^* , VM
The pulse width modulation signals SU, SV, SW are calculated based on W ^* , and the pulse width modulation signals SU, SV, SW are output to drive processing means (not shown) of the motor control device 49. The drive processing means performs drive processing and sends a drive signal to the inverter 29 based on the pulse width modulation signals SU, SV, SW. In this way, feedback control is performed.

By the way, the DC / DC converter 48
Is formed by a relay and is connected between a switch 56 connected to the positive terminal of the auxiliary battery 45, NPN type transistors Tr1 and Tr2 arranged as a chopper, and the emitter / collector of each transistor Tr1 and Tr2. Diode D1, D2 and coil, one end of which is the emitter of transistor Tr1 and transistor Tr2.
Connected to the collector of the switch 56, and the other end is connected to the switch 56.
, And a capacitor C1 having one end connected between the switch 56 and the inductance L and the other end connected to the negative terminal of the auxiliary battery 45. In the present embodiment, the switch 5
Although 6 is formed by a relay, a power MOSFET, a power transistor, an SSR (solid state relay) or the like can be used as the switch 56.

In the transistor Tr1,
The collector is connected to the main relay 47 and the positive terminal of the main battery 43, and the base is the DC / DC control circuit 58.
, The emitter is connected to the inductance L as described above, the collector is connected to the inductance L as described above, the base is connected to the DC / DC control circuit 58, and the emitter is mainly connected to the transistor Tr2. It is connected to the negative terminal of the battery 43 and the auxiliary battery 45. The capacitor C1 absorbs noise such as chattering (contact jumping) that occurs when the electrical contacts of the relay forming the switch 56 are opened and closed. The voltage detection circuit 57 is connected to the capacitor C1.
Are connected. Further, the power source circuit 59 and the ignition switch 6 are connected to the positive terminal of the auxiliary battery 45.
1 is connected.

When boosting is performed using the DC / DC converter 48, the boosting processing means (not shown) of the vehicle control device 51 sends a predetermined instruction to the DC / DC control circuit 58 to perform boosting processing. To do. The DC / DC control circuit 58 sends a predetermined drive signal to the transistor Tr1 to switch the transistor Tr1 and causes the transistor Tr2 to switch.
Drive signal is not sent to the transistor Tr2 and the transistor Tr2 is stopped. As a result, the voltage of 12 [V] of the auxiliary battery 45 is converted into the voltage of 42 [V], and the voltage of 42 [V] is output. Along with this, electric power is moved from auxiliary battery 45 to main battery 43.

On the other hand, when stepping down the voltage using the DC / DC converter 48, the step-down processing means (not shown) of the vehicle control device 51 sends a predetermined instruction to the DC / DC control circuit 58 to perform the step-down processing. To do. And DC / DC
The control circuit 58 sends a predetermined drive signal to the transistor Tr2 to cause switching, and causes the transistor T2 to switch.
The drive signal is not sent to r1, and the transistor Tr1 is stopped. As a result, the voltage of 42 [V] of the main battery 43 is converted into the voltage of 12 [V], and the voltage of 12 [V] is output. Along with this, electric power is moved from main battery 43 to auxiliary battery 45.

By the way, in the present embodiment, as described above, a nickel-hydrogen storage battery is used as the main battery 43. Therefore, when the main battery 43 is placed in a predetermined environment, for example, an extremely low temperature, the temperature tmB of the main battery 43 becomes an extremely low temperature, and it becomes difficult to store and release hydrogen in the nickel-hydrogen storage battery.
The characteristics are extremely deteriorated.

Therefore, in the present embodiment, when the temperature tmB of the main battery 43 becomes extremely low, the electric power is moved from the auxiliary battery 45 to the main battery 43 to raise the temperature tmB of the main battery 43. There is.

FIG. 6 is a flow chart showing the operation of the hybrid vehicle drive control device in the embodiment of the present invention.

In this case, the electric power movement processing means 91 (FIG. 1) of the vehicle control device 51 (FIG. 4) performs electric power movement processing,
The temperature tmB of the main battery 43 detected by the battery temperature sensor 63 is read to determine whether the temperature tmB is extremely low, that is, the temperature tmB is the auxiliary battery 4
It is determined whether or not the value is lower than a first threshold value suitable for transferring electric power from 5 to the main battery 43, for example, -20 [° C] which is the value Tc in the present embodiment. Then, when the temperature tmB is lower than −20 [° C.], the power transfer processing means 91 transfers power from the auxiliary battery 45 to the main battery 43. In the present embodiment, when the temperature tmB is lower than −20 [° C.], electric power is moved from the auxiliary battery 45 to the main battery 43.
It is also possible to transfer the electric power from the auxiliary battery 45 to the main battery 43 when the discharge electric power of No. 3 is lower than a predetermined temperature at which the electric power is significantly reduced.

Therefore, the power transfer processing means 91
Sends the same instruction as the instruction in the boosting process to the DC / DC control circuit 58. Then, the DC / DC control circuit 5
Reference numeral 8 sends a predetermined drive signal to the transistor Tr1 for switching, and sends no drive signal to the transistor Tr2 to stop the transistor Tr2. As a result, the voltage of 12 [V] of the auxiliary battery 45 is 42
It is converted into a voltage of [V] and a voltage of 42 [V] is output. Along with this, a predetermined current with a voltage of 42 [V]
The power is supplied from the DC / DC converter 48 to the main battery 43 and moved.

By the way, although the main battery 43 is charged as electric power is transferred from the auxiliary battery 45 to the main battery 43, the chemical reaction at the time of charging in the nickel-hydrogen storage battery constituting the main battery 43 is This is an exothermic reaction, the main battery 43 generates heat as it is charged, and the battery temperature tmB rises. Further, the battery temperature of the battery cell of the nickel-hydrogen storage battery is further increased because the battery cell connection portion generates heat due to its own electric resistance.

Therefore, the power transfer processing means 91 reads the temperature tmB of the main battery 43, and the temperature tmB becomes
The second threshold value that facilitates the occlusion / release of hydrogen in the nickel-hydrogen storage battery and can improve the characteristics, which is the value Tc in the present embodiment −20
Determine whether it is above [℃].

When the temperature tmB is -20 [° C.] or higher, the command generation processing means (not shown) of the vehicle control device 51 performs command generation processing to generate a cranking torque command, and the cranking torque command is generated. To the engine control unit 46. When the cranking torque command is sent from the vehicle control device 51, an engine start processing means (not shown) of the engine control device 46 performs an engine start process to start the engine 11.

Subsequently, the vehicle control device 51 reads the engine rotation speed NE detected by an engine rotation speed sensor (not shown), and judges whether the engine rotation speed NE becomes higher than a predetermined value, thereby starting the engine. Determine if it was successful. Then, if the engine start is successful, the processing is ended, and if the engine start is not successful, the power transfer processing means 91.
Restarts the power transfer process.

After the engine 11 is started, the rotation of the engine 11 is transmitted to the motor 25 and the motor 25
Since the power is generated, the current is supplied to the main battery 43, and the main battery 43 is charged, the main battery 43 sufficiently generates heat.

In this way, the temperature tmB of the main battery 43 is
Is lower than −20 [° C.], electric power is moved from the auxiliary battery 45 to the main battery 43 and the main battery 43
Since the temperature tmB is increased, the characteristics of the main battery 43 can be improved under extremely low temperature.

Further, since the main battery 43 is sufficiently discharged at the extremely low temperature and the engine 11 is started by the direct current supplied to the motor 25, the engine 11 is started separately from the motor 25. It is no longer necessary to install the starter of the above in a hybrid vehicle. Therefore, the weight of the hybrid vehicle can be reduced, and the cost of the hybrid vehicle can be reduced.

Further, since the lead storage battery is not used as the main battery 43, it is not necessary to frequently replace the main battery 43, and the cost of the hybrid type vehicle can be reduced. Since the nickel-hydrogen storage battery has a high output density, it is possible to improve the power performance during acceleration or the like. Further, since the nickel-hydrogen storage battery having a power capacity smaller than that of the lead storage battery is mounted on the hybrid type vehicle as the main battery 43, the weight of the hybrid type vehicle can be reduced and the mountability can be improved.

Next, the flow chart will be described.
Step S1 It is judged whether the temperature of the main battery 43 is lower than -20 [° C]. The temperature of the main battery 43 is −
If the temperature is lower than 20 [° C], the process proceeds to step S2, and if the temperature of the main battery 43 is -20 [° C] or higher, the process ends. In step S2, the electric power is transferred from the auxiliary battery 45 to the main battery 43. In step S3, it is determined whether the temperature of the main battery 43 is -20 [° C] or higher. When the temperature of the main battery 43 is −20 [° C.] or higher, the process proceeds to step S4, and the temperature of the main battery 43 is −2.
If the temperature is lower than 0 [° C], the process returns to step S2. Step S4 Send a cranking torque command. Step S5
Determine if the engine started successfully. If the engine start is successful, the process ends, and if the engine start is not successful, the process returns to step S1.

In the present embodiment, the first and second threshold values are set to the value Tc of -20 [° C.], but the first threshold value can be set to a value different from the value Tc. , The second threshold can be set to any value equal to or greater than the value Tc.

Further, in the present embodiment, the temperature tmB of the main battery 43 is detected as the battery environment by the battery temperature sensor 63, and it is determined in step S1 whether or not the temperature tmB is lower than -20 [° C]. However, the temperature of a predetermined location of the hybrid vehicle can be detected as a battery environment. In this case, in step S3, the temperature t of the main battery 43
Since it is necessary to judge whether mB is -20 [° C] or higher, the battery temperature sensor 63 is connected to the main battery 43.
Need to be installed.

Further, in the present embodiment, when the main battery 43 is placed in an extremely low temperature, the auxiliary battery 45
Power is transferred from the main battery 4 to the main battery 43.
3 causes an exothermic reaction. However, when a predetermined battery of the main battery 43 and the auxiliary battery 45, for example, the main battery 43 is placed at an extremely high temperature as a predetermined battery environment, the voltage is reduced. Similar to the process, electric power can be transferred from the main battery 43 to the auxiliary battery 45 to cause an endothermic reaction in the main battery 43.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention, and they are not excluded from the scope of the present invention.

[0073]

As described in detail above, according to the present invention, in the hybrid vehicle drive control device, the first battery, the second battery, and the first power source of the first battery are provided. A voltage conversion member that converts a voltage between a voltage and a second power supply voltage of the second battery, a battery environment detection unit that detects a battery environment, and a predetermined battery of the first and second batteries Has a predetermined battery environment, and has a power transfer processing unit that transfers power from one battery to the other battery.

In this case, when a predetermined battery of the first and second batteries is placed in a predetermined battery environment, electric power is transferred from one battery to the other battery, so that the other battery In the above, sufficient discharge can be performed.

Therefore, for example, when trying to start the engine, the other battery can be used, and it is not necessary to dispose the starter. as a result,
Not only can the weight of the hybrid vehicle be reduced, but the cost of the hybrid vehicle can be reduced.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a hybrid vehicle drive control device according to an embodiment of the present invention.

FIG. 2 is a diagram showing characteristics of a nickel-hydrogen storage battery and a lead storage battery.

FIG. 3 is a schematic diagram showing a main part of a vehicle drive device according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a hybrid vehicle drive control device in an embodiment of the present invention.

FIG. 5 is a schematic diagram showing a main part of a hybrid vehicle drive control device according to an embodiment of the present invention.

FIG. 6 is a flowchart showing an operation of the hybrid vehicle drive control device in the embodiment of the present invention.

[Explanation of symbols]

25 motor 43 Main battery 45 Auxiliary battery 48 DC / DC converter 51 Vehicle control device 63 Battery temperature sensor 91 Power Transfer Processing Means

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) B60L 11/14 B60K 6/04

Claims (7)

[Claims] 1. A first battery, a second battery,
A voltage conversion member that converts a voltage between a first power supply voltage of the first battery and a second power supply voltage of the second battery; a battery environment detection unit that detects a battery environment; A hybrid vehicle having a power transfer processing unit that transfers power from one battery to the other battery when a predetermined battery of the second batteries is placed in a predetermined battery environment. Drive controller. 2. The hybrid vehicle drive control device according to claim 1, wherein the battery environment is a temperature of a predetermined battery of the first and second batteries. 3. The hybrid vehicle drive control device according to claim 1, wherein the predetermined battery environment is extremely low temperature. 4. The first battery is a main battery serving as a power source for supplying electric power to a motor, and the second battery
The hybrid vehicle drive control device according to any one of claims 1 to 3, wherein the battery is an auxiliary battery that serves as a power source for supplying electric power to the auxiliary device. 5. The hybrid vehicle drive control device according to claim 1, wherein the chemical reaction during charging in the other battery is an exothermic reaction. 6. A first battery, a second battery, and a voltage conversion member that converts a voltage between a first power supply voltage of the first battery and a second power supply voltage of the second battery. In the control method of the hybrid type vehicle drive device,
A battery environment is detected, and when a predetermined battery of the first and second batteries is placed under a predetermined battery environment, power is transferred from one battery to the other battery. A method for controlling a hybrid vehicle drive device. 7. A first battery, a second battery, and a first battery.
Of a hybrid vehicle drive device including a voltage conversion member that converts a voltage between a first power supply voltage of a battery and a second power supply voltage of a second battery, and a battery environment detection unit that detects a battery environment. In the control method program, a power transfer for causing a computer to transfer power from one battery to another battery when a predetermined battery of the first and second batteries is placed under a predetermined battery environment. A program for a control method for a hybrid vehicle drive device, characterized in that the program functions as a processing means.