JPH11318002A - Controller of hybrid vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize the accumulated energy of a 1st accumulator for the motor operation of a motor-generator as much as possible, for the motor operation of the motor-generator, secure the proper accumulation state of the 1st accumulator and improve the energy efficiency of a vehicle. SOLUTION: When the generator operation of a motor-generator 2 is conducted in an idling operation state or a cruise running state, the target generated power of the motor-generator 2 is predetermined in accordance with the input power or the output power of a step-down device 19, by which energy is supplied from a 1st accumulator 5 side to a 2nd accumulator 6 in a low voltage system and the accumulated power of the 1st accumulator 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a control device for a parallel type hybrid vehicle.

[0002]

2. Description of the Related Art A parallel type hybrid vehicle has an engine as a main propulsion source of the vehicle, a generator motor capable of selectively performing operations as a motor and a generator, and an electric power between the generator motor and the generator. A first power storage device such as a battery or a capacitor that exchanges data is mounted, and a rotor of the generator motor is connected to a power transmission system (for example, an output shaft of the engine) from the engine to driving wheels of the vehicle. For example, when the vehicle is accelerating, the first power storage device supplies power to the generator motor so that the generator motor operates as a motor, and the output (mechanical power) of this motor is output together with the output of the engine to the vehicle via the power transmission system. To the drive wheels. Also, for example, when the vehicle is decelerated, the kinetic energy of the vehicle is transmitted from the driving wheel side to the generator motor to operate the generator motor as a generator (regenerative power generation operation), or when the vehicle is cruising (substantially constant speed). When the vehicle is idling, or when the engine is idling (when the engine is idling while the vehicle is stopped), part of the engine output is transmitted to the generator motor, and the generator motor is operated as a generator. The first power storage device is charged with the generated energy. The first
The power storage device has a high output voltage of, for example, 100 to 180 V.

On the other hand, this type of hybrid vehicle has a second power storage device (usually a battery) having a lower voltage (for example, 12 V) than the first power storage device, in addition to the above configuration.
And an electronic circuit unit that operates using the second power storage device as a power supply, and low-voltage electronic devices such as an audio device and an ignition device are mounted on the vehicle. The second power storage device can be appropriately charged through the step-down converter (DC / DC converter) with a part of the storage energy of the first power storage device or a part of the generation energy when the generator motor operates as a generator. I have to.

Conventionally, in such a hybrid vehicle system, the amount of power generated during operation of the generator motor as a generator depends on the power storage state of the second power storage device and the operation state of the low-voltage electronic device (how much power Are you consuming?)
Irrespective of the running state of the vehicle, the power storage state of the first power storage device, and the like. For this reason, the amount of power generated by the generator motor tends to be too large or too small for the energy consumption of the second power storage device by the low-voltage electronic device.

In particular, the amount of power generated by the generator motor
When the energy consumption of the power storage device is short, the stored energy of the second power storage device decreases, and the reduced energy is transferred from the first power storage device to the second power storage device via the step-down converter. The device will be replenished (charged). As a result, of the stored energy of the first power storage device, there is a shortage of energy for operating the generator motor as a motor, and a sufficient output of the motor cannot be generated during acceleration running of the vehicle. Alternatively, if the output of the engine is increased to compensate for the output shortage, there is a disadvantage that the fuel consumption of the engine is increased.

When the amount of power generated by the generator motor is greater than the amount of energy consumed by the second power storage device, the generated energy of the generator motor is charged in both the first power storage device and the second power storage device. . When the operation of such a generator motor as a generator is frequently performed in a state near full charge of the first power storage device and the second power storage device, the generated energy of the generator motor is eventually transferred to the first power storage device or the second power storage device. In this case, the electric power cannot be stored in the power storage device, and in this case, the generated energy of the generator motor is wastefully consumed as heat energy or the like. In this case, especially during cruise traveling or idling operation in which the generator motor generates electric power using the output of the engine, wasteful fuel consumption of the engine is involved.

As described above, in the conventional hybrid vehicle,
Since the amount of power generated during operation of the generator motor as a generator is more or less than the energy consumption of the second power storage device, the storage energy of the first power storage device and the power generation energy of the generator motor can be used by the vehicle as needed. It has been difficult to effectively use the vehicle to secure driving performance and minimize the fuel consumption of the engine.

[0008]

SUMMARY OF THE INVENTION In view of the foregoing, the present invention has a configuration in which the electric storage energy of a first electric storage device for supplying power energy to the electric motor of a generator motor during operation and the first electric storage device is higher than that of the first electric storage device. Excessive consumption by the low-voltage second power storage device or the electronic device can be suppressed, and the stored energy of the first power storage device can be utilized for the operation of the generator motor as much as possible. It is an object to provide a control device for a hybrid vehicle.

It is still another object of the present invention to provide a control device for a hybrid vehicle which can ensure an appropriate power storage state of the first power storage device when power is generated by the generator motor and can increase the energy efficiency of the vehicle.

[0010]

In order to achieve the above object, a control device for a hybrid vehicle according to the present invention has an engine which is a propulsion source of the vehicle, and an auxiliary which transmits the output of the engine to driving wheels of the vehicle together with the output of the engine. A generator motor that performs an operation as a motor that generates output and an operation as a generator that generates generated energy, and supplies power energy to the generator motor during operation of the generator motor as a motor, and generates power from the generator motor. A first power storage device provided so as to be able to charge generated energy during operation as a motor, and a second power storage device provided so as to be able to charge the stored energy of the first power storage device or the generated energy of the generator motor via a step-down device. Equipment and
In a control device for a hybrid vehicle including a low-voltage electronic device that operates using the second power storage device as a power source, the target power generation amount during operation of the generator motor as a generator is determined by an input power amount to the step-down converter or the target power generation amount. A generator motor control means is provided which is set in accordance with the output power of the step-down converter and controls the generator motor based on the set target power generation.

According to the present invention, the amount of input power to the step-down converter or the amount of output power of the step-down converter (hereinafter, these amounts of power are referred to as the input / output power of the step-down converter for convenience of description). ) Basically corresponds to the energy consumption of the second power storage device by the low-voltage electronic device (more precisely, the energy consumption of a circuit system including the second power storage device and the low-voltage electronic device). Therefore, when the generator motor operates as a generator, the target power generation amount set by the generator motor control means according to the input / output electric energy increases or decreases in accordance with the increase or decrease in the energy consumption of the second power storage device. .
For this reason, by controlling the generator motor based on this target power generation amount, the generated energy suitable for the energy consumption of the second power storage device is transferred from the generator motor to the second generator via the step-down converter.
The power storage device is replenished (charged). Thereby, it is possible to suppress the storage energy of the first power storage device from being consumed by the circuit system including the second power storage device and the low-voltage electronic device. As a result, the storage energy of the first power storage device is reduced as much as possible. It can be utilized for the operation of the generator motor as an electric motor, and required traveling performance of the vehicle can be secured.

In the present invention, the above-mentioned setting of the target power generation amount and control of the generator motor based on the target power generation amount are performed by transmitting the kinetic energy of the vehicle to the rotor of the generator motor so that the generator motor operates as a generator. (Regenerative power generation operation) either during deceleration of the vehicle to be operated, or during cruise and / or idling operation of a vehicle that operates the generator motor as a generator by transmitting the output of the engine to the rotor of the generator motor. However, the regenerative power generation operation of the generator motor at the time of deceleration of the vehicle can be performed without fuel consumption of the engine. For this reason, in the regenerative power generation operation at the time of deceleration of the vehicle, as much as possible, the first power storage device generates the power generation energy of the generator motor as compared with setting the target power generation amount of the generator motor in accordance with the input / output power amount. Charging the device is preferable for energy efficiency.

Therefore, in the present invention, the generator motor control means sets the target power generation amount according to the input / output power amount of the step-down converter, and operates the generator motor as a generator by the output of the engine. This is performed when the vehicle is running on a cruise and / or idling.

Thus, in the regenerative operation of the generator motor when the vehicle is decelerating, it is possible to cause the generator motor to generate a sufficiently large amount of generated energy and charge the second power storage device. Further, when the vehicle is traveling on a cruise and / or when idling, the target power generation amount is set according to the input / output power amount,
Set a minimum target power generation amount (for example, a target power generation amount equal to the input / output power amount) required to suppress the consumption of the stored energy of the first power storage device by the circuit system of the second power storage device and the low-voltage electronic device. And as a result,
It is possible to minimize the fuel consumption of the engine accompanying the power generation of the generator motor.

Further, according to the present invention, when the amount of power stored in the first power storage device is small, it is necessary to secure sufficient power supply energy during operation of the generator motor as a motor and to secure required traveling performance of the vehicle. When the generator motor operates as a generator, it is preferable that not only the energy consumption of the second power storage device be replenished with the generated energy but also the power storage energy of the first power storage device. Further, in a state where the first power storage device is almost fully charged, even when the regenerative power generation operation of the generator motor is performed with a relatively large power generation amount when the vehicle is decelerated,
Since the generated energy cannot be stored in the first power storage device, part or all of the energy consumption of the second power storage device is supplemented by the stored energy of the first power storage device, and the stored energy of the first power storage device is reduced. It is preferable to consume to some extent. In other words, during operation of the generator motor as a generator, it is necessary to generate the generator motor so as to secure an appropriate power storage state of the first power storage device. It is preferable in increasing the value.

Therefore, in the present invention, the generator motor control means changes the target power generation amount set according to the input / output power amount of the step-down converter according to the power storage amount of the first power storage device. Have.

As described above, the target power generation amount corresponding to the input / output power amount is appropriately changed (increased / decreased) according to the power storage amount (remaining capacity) of the first power storage device, so that the power storage amount of the first power storage device is obtained. It is possible to maintain an appropriate amount of stored power in order to secure the necessary running performance of the vehicle and to increase the energy efficiency.

In this case, more specifically, in the present invention,
The generator motor control means sets the input / output power amount of the step-down converter as the target power generation amount when the power storage amount of the first power storage device is within a predetermined range that is equal to or less than the power storage amount in a fully charged state. When the power storage amount is smaller than the predetermined range, the target power generation amount is set to be larger than the input / output power amount of the step-down converter.

Further, the generator motor control means, when the amount of power stored in the first power storage device is within a predetermined range smaller than the amount of power stored in the fully charged state, adjusts the input / output power amount of the voltage step-down device. The target power generation amount is set as a target power generation amount, and when the power storage amount is larger than the predetermined range, the target power generation amount is set smaller than the input / output power amount of the step-down converter.

Further, by using these methods of setting the target power generation amount together, the generator motor control means determines that the power storage amount of the first power storage device is within a predetermined range smaller than the power storage amount in the fully charged state. When the input / output power amount of the step-down converter is set as the target power generation amount, and when the storage amount is smaller than the predetermined range, the target power generation amount is set to the input / output power of the step-down converter.
The target power generation amount is set to be smaller than the input / output power amount of the step-down converter when the storage amount is set to be larger than the output power amount and the storage amount is larger than the predetermined range.

By setting the target power generation amount during the operation of the generator motor as a generator as described above, when the power storage amount of the first power storage device is within the predetermined range, the generator motor in this state is not controlled. Since the generated energy during operation as a generator is replenished (charged) to the second power storage device with no more or less than the energy consumption of the second power storage device, the power storage amount of the first power storage device is equal to the predetermined amount. Stay within range. When the stored energy of the first power storage device becomes smaller than the predetermined range because the stored energy of the first power storage device is used for the operation of the generator motor as a motor, for example, At the time of power generation of the generator motor, a target power generation amount larger than the input / output power amount is set.
At the same time as the stored energy of the second power storage device is replenished, the stored energy of the first power storage device is also replenished. Therefore, the charged amount of the first power storage device returns to the charged amount within the predetermined range. When the power storage amount of the first power storage device becomes larger than the predetermined range, the target power generation amount smaller than the input / output power amount (zero target power generation amount) when the generator motor generates power in this state. Is set), so that the stored energy of the first power storage device is replenished to the second power storage device. Therefore, the storage amount of the first power storage device decreases,
It returns within the predetermined range.

In this way, it is possible to generate the electric power of the generator motor so as to keep the amount of power stored in the first power storage device at an appropriate level (the amount of power stored within a predetermined range).

In the present invention, the step-down converter is a step-down converter capable of controlling its output voltage to a plurality of types of output voltages. When the first power storage device is substantially fully charged, the output of the step-down converter is reduced. Means is provided for controlling the voltage to a higher output voltage.

According to this, when the first power storage device is almost fully charged, the output voltage of the step-down converter is controlled to the output voltage on the high voltage side, so that the generator motor can operate at the time of operation as a motor. When the operation of the generator motor is stopped, the stored energy of the first power storage device is charged to the second power storage device more via the step-down device. For this reason, the charged amount of the first power storage device decreases from the fully charged state. That is, the power storage amount of the first power storage device is likely to be maintained at a smaller power storage amount than in the fully charged state. As a result, for example, when the generator motor is operated as a generator by the kinetic energy of the vehicle at the time of deceleration of the vehicle (regenerative power generation operation), the generated energy can be charged to the first power storage device without any trouble. The energy efficiency of the vehicle can be increased.

Further, in the present invention, the generator motor is provided so as to be able to start the engine by operation as the motor, and when the engine is started, the charged amount of the first power storage device is reduced to a predetermined value or less. Means for charging the first power storage device from the second power storage device via a booster when the first power storage device is being operated.

That is, the power storage amount of the first power storage device decreases to the predetermined value or less due to a long-term self-discharge or the like. With the stored energy of the first power storage device, the generator motor is operated as a motor to start the engine. In such a situation, the engine can be started by charging the first power storage device from the second power storage device via the booster.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

FIG. 1 schematically shows the overall system configuration of a hybrid vehicle provided with a control device according to the present embodiment. In FIG. 1, reference numeral 1 denotes an engine, 2 denotes a generator motor, and 3 denotes a transmission including a clutch 4. 5 is the first power storage device, 6 is the second power storage device
A power storage device, 7 is a driving wheel for driving the vehicle, 8 is an engine controller, 9 is a generator motor controller, 10 is a transmission controller, 11 is a power supply system controller, and 12 is a general control controller.

The engine 1 is a main propulsion source of the vehicle, and transmits its output from a not-shown output shaft (crankshaft) to driving wheels 6 via a rotor (not shown) of the generator motor 2 and a transmission 3. Then, the vehicle is driven.

The engine 1 includes an engine speed NE, an intake pressure PB, an engine temperature TW, and an opening θth of a throttle valve (intake control valve) (not shown) (hereinafter referred to as a throttle opening θth). 1 (hereinafter, referred to as an E / G sensor 13)
Is attached. Data detected by the E / G sensor 13 such as the rotational speed NE is given to the engine controller 8.

Further, the engine 1 has a drive mechanism for operating the engine 1, an ignition device 14 a for igniting a mixture of fuel and air supplied to the engine 1, and a fuel supply device for supplying fuel to the engine 1. 14b, a throttle actuator 14c for driving a throttle valve is provided. Hereinafter, these drive mechanisms 14a to 14c are generally referred to as an engine drive device 14.

The generator motor 2 has its rotor (not shown) coaxially connected to the output shaft of the engine 1, and the armature coil (not shown) of the generator motor 2 is composed of a regulator / inverter circuit and the like. It is electrically connected to the positive and negative power supply terminals of the first power storage device 5 via an energization control circuit 15 (hereinafter, referred to as PDU 15).

The generator motor 2 uses the electric power stored in the first power storage device 5 as an energy source to assist the output of the engine 1 with an auxiliary output (an auxiliary output that is transmitted to the drive wheels 7 together with the output of the engine 1). An operation as an electric motor for generating vehicle propulsion (hereinafter, referred to as an assist operation), and a first power storage device using kinetic energy transmitted from the drive wheels 7 and part of the output of the engine 1 as an energy source when the vehicle is decelerated. 5 or an operation as a generator for generating electric power for charging the second power storage device 6 (hereinafter referred to as a power generation operation). Each operation is performed by the generator motor 2
The power transfer between the power storage device 5 and the first power storage device 5 or the second power storage device 6 is controlled through the PDU 15.

A detection device 16 (hereinafter, referred to as a G / M sensor 16) for detecting the current Igm and the voltage Vgm of the armature coil of the generator motor 2 is provided along with the generator motor 2. Data detected by the G / M sensor 16 is given to the generator motor controller 9.

The first power storage device 5 stores a high-voltage power of, for example, about 100 to 180 V as a power supply for assisting the operation of the generator motor 2. In the present embodiment, the first power storage device 5 is constituted by an electric double layer capacitor. I have. The charge / discharge current Ib of the power storage device 5 is attached to the first power storage device 5.
(Current flowing between the positive and negative power supply terminals of the first power storage device 5) and terminal voltage Vb (voltage generated between the positive and negative power supply terminals of the power storage device 5) (hereinafter, detection device 17)
A U / C sensor 17 is provided, and detection data from the U / C sensor 17 is provided to the power supply system controller 11 as data for grasping the amount of power stored in the first power storage device 5. In this case, the charging / discharging current Ib detected by the U / C sensor 17 includes a charging current flowing into the first power storage device 5 and a discharging current flowing out of the first power storage device 5. Can be detected separately.
In the present embodiment, an electric double layer capacitor is used as the first power storage device 5, but a secondary battery such as a battery may be used.

The second power storage device 6 includes the controllers 8
, An ignition device 14a, an audio device (not shown), and other low-voltage electronic devices 18 (e.g., electronic devices that operate using a power supply having a voltage lower than the voltage of the first power storage device 5 (for example, 12 V)). In this embodiment, for example, a 12 V battery (a secondary battery such as a lead storage battery) is used.

The positive and negative power supply terminals of the second power storage device 6
In addition to being connected to the low-voltage electronic device 18, the first power storage device 5 or the first power storage device 5 receives a first power via the step-down converter 19 (DC / DC converter) to receive power from the generator motor 2 during the power generation operation.
The power storage device 5 is connected to the positive and negative output terminals. Further, the positive and negative power supply terminals of the second power storage device 6 are connected to the first power storage device 6 via a booster 20 (DC / DC converter) so as to supply the stored energy of the second power storage device 6 to the first power storage device 5 side. The power storage device 5 is connected to the positive and negative power supply terminals.

Although a battery is used as the second power storage device 6 in this embodiment, an electric double layer capacitor or the like may be used as in the first power storage device 5.

In addition to the step-down device 19, the input current Ii to the step-down device 19 is detected in order to detect the power input from the first power storage device 5 or the generator motor 2 during the power generation operation. And sensor 21 for detecting input voltage Vi
(Hereinafter, referred to as a step-down power sensor 21). The respective detection data of the input current Ii and the input voltage Vi by the step-down power sensor 21 are given to the power supply system controller 11, and the detected values Ii,
By the product of Vi, the input power to the step-down converter 19 (= Ii.V
i) can be detected.

Note that the step-down converter 19 outputs the output voltage to the second
Voltage Vs (for example, 12.5) corresponding to the terminal voltage in the standard power storage state (state close to full charge) of power storage device 6
V) and a voltage Vf (> Vs, for example, 14.3 V) slightly higher than the terminal voltage of the second power storage device 6 in the fully charged state.
And the switching control can be selectively performed. Hereinafter, the voltage V
s is called a low-voltage output voltage, and voltage Vf is called a high-voltage output voltage.

The transmission 3 cuts off the power transmission between the engine 1 and the generator motor 2 and the driving wheels 6 by the operation of the clutch 4 and shifts the power transmission. An actuator 22 for performing a disconnecting operation of the clutch 4 is provided. Further, the transmission 3 has an operation position SP of a shift operation lever (not shown) for setting the operation state by a driver of the vehicle.
For example, a detecting device 23 (hereinafter, referred to as a T / M sensor 23) for detecting an operation state of the transmission 3 is provided.
Data detected by the sensor 23 is provided to the transmission controller 10.

Each of the controllers 8 to 12 is constituted by using a microcomputer, and a bus line B is provided so that various kinds of data can be exchanged with each other.
It is connected via L.

Among these controllers 8 to 12, the engine controller 8 controls the operation of the engine 1 via the engine driving device 14, and the generator motor controller 9 controls the operation of the generator motor 2 in the PDU.
A transmission controller 10 controls the operation of the transmission 3 (including the clutch 4) via the actuator 22.

Further, the power supply system controller 11
Of the storage amount (remaining capacity) of the first power storage device 5 based on the detection data of the / C sensor 16 (the charge / discharge current Ib and the terminal voltage Vb of the power storage device 5), and the detection data of the step-down device power sensor 21 (the step-down device 19, the input current Ii and the input voltage V
Input power to the step-down converter 19 based on i) (= Ii · Vi)
Control, switching control of the output voltage of the step-down converter 19,
Is a controller that controls the operation of the device.

In this case, the power storage amount of the first power storage device 5 is grasped, for example, as follows. That is, the charge / discharge current Ib and the terminal voltage Vb, which are detection data of the U / C sensor 16,
, That is, the charge / discharge power of the first power storage device 5 (discharge power is positive and charge power is negative) is sequentially calculated from the fully charged state of the first power storage device 5 and integrated (cumulatively added). Go.
Then, the accumulated value (remaining capacity) of the first power storage device 5 is determined by subtracting this integrated value from the total amount of energy that can be released in the fully charged state of the first power storage device 5 (capacity in the fully charged state). I do. In addition, there are various other methods for grasping the charged amount of the first power storage device 5. For example, the charged amount is grasped while performing correction according to the temperature of the first power storage device 5. Alternatively, the power storage amount of the first power storage device 5 may be grasped only from the terminal voltage Vb.

The general management controller 12 is a controller that performs overall operation management processing of the system according to the present embodiment, and grasps a required driving state of the vehicle and an engine corresponding to the grasped driving state. 1 and the target operating state of the generator motor 2 (specifically, the target output of the engine 1, the target auxiliary output during the assist operation of the generator motor 2, or the target power output during the power generation operation), 8 and generator motor controller 9
And the like.

In order to perform the processing, the general control controller 12 sends various data (for example, the rotational speed NE of the engine 1, the amount of power stored in the first power storage device 5, and the step-down device 19) from the other controllers 8 to 11. Input data, etc.), as well as detection data of a sensor 24 for detecting a vehicle speed Vcar and a sensor 25 for detecting an operation amount Ap (hereinafter referred to as an accelerator operation amount Ap) of an accelerator pedal (not shown) of the vehicle. .

According to the configuration of the present invention, the generator motor controller 9 and the overall management controller 12 correspond to generator motor control means.

Next, the operation of the hybrid vehicle of this embodiment will be described.

When the vehicle is operating (when the engine 1 is operating), the general control controller 12
Performs the main routine shown in the flowchart of FIG. 2 in a predetermined control cycle.

That is, the overall management controller 12
First power storage device 5 sequentially grasped by power supply system controller 11
And the current value of the input power (= Ii · Vi) of the step-down converter 19 from the power supply system controller 11, and the detection data of the vehicle speed Vcar and the accelerator operation amount Ap from the sensors 24 and 25, respectively. And then
Data obtained by the E / G sensor 13 such as the rotational speed NE of the engine 1 and the throttle opening θth are acquired via the engine controller 8 (STEP 2-1).

Next, the supervisory controller 12 determines that the operation mode of the vehicle is the idling operation mode,
While the vehicle is stopped and idling operation of the engine 1 is performed, it is determined based on the output of the engine 1 whether or not the mode for performing the power generation operation of the generator motor 2 is appropriate (STE).
P2-2). This determination is made based on, for example, the throttle opening degree θth ≒
0, and whether or not the vehicle speed Vcar ≒ 0,
When θth ≒ 0 and Vcar ≒ 0, it is determined that the engine is in the idling operation mode.

In this determination, if the vehicle operation mode is the idling operation mode, a process for controlling the output voltage of the step-down converter 19 is performed (STEP 2-).
3) Further, control processing for the idling operation mode is performed (STEP 2-4).

More specifically, in STEP 2-3, the supervisory controller 12 performs a subroutine process shown in the flowchart of FIG. That is, the supervisory controller 12 determines that the current power storage amount of the first power storage device 5 acquired in STEP 2-1 is a predetermined value C1 () that is slightly smaller than the power storage amount of the first power storage device 5 in the fully charged state. (See FIG. 7)
P3-1). When the amount of stored power ≧ C1 (when the first power storage device 5 is almost fully charged),
Is set to the high side output voltage Vf (14.3 V) (STEP 3-2), and this is instructed to the power supply system controller 11 (STEP 3-4). In addition, the amount of stored power <C
If it is 1, the output voltage of the step-down converter 19 is set to the low-voltage side output voltage Vs (12.5 V) (STEP 3-
3), instruct it to the power supply system controller 11 (ST)
EP3-4).

The power supply system controller 11 which has been instructed as to the output voltage of the step-down converter 19 as described above controls the output voltage of the step-down converter 19 in accordance with the instruction.

In STEP 2-4, the supervisory controller 12 performs a subroutine process shown in the flowchart of FIG. That is, the supervisory controller 12 determines the current vehicle speed Vca obtained in STEP 2-1.
From r (Ｃ0), for example, a target value C2 of the power storage amount of the first power storage device 5 is obtained according to a predetermined data table as shown in FIG. 7 (STEP 4-1). Since the data table of FIG. 7 is used also in a cruise power generation mode described later, the target value C2 changes according to the vehicle speed Vcar. However, the first power storage device 5 in the idling operation mode is used. The target value C2 of the power storage amount may be a predetermined fixed value, or may be set in a mode different from the cruise power generation mode.

Next, the overall management controller 12
The current power storage amount of the first power storage device 5 acquired in TEP2-1 is a predetermined value (C2-δ) smaller than the target value C2 by a predetermined amount δ (>0; a fixed value in the present embodiment) (FIG. 7). (See STEP 4-2). And the amount of storage <
C2-δ, that is, when the charged amount is the target value C
2, the target power generation amount by the power generation operation of the generator motor 2 is determined by the power supply controller 11 to the current input power (= I
The value is set to a value larger than i · Vi) by a predetermined amount α1 (STEP 4-3). In this case, the predetermined amount α1 in this case is a fixed value (constant value) in the present embodiment, but may be variably set as appropriate according to the operating state of the engine 1 and the like.

On the other hand, in STEP4-2, the charged amount ≧ C2-δ
In the case of, the general management controller 12 further calculates the current power storage amount of the first power storage device 5 by the target value C2
Is compared with a predetermined value (C2 + δ) (see FIG. 7) larger than the predetermined amount δ (STEP 4-4), and the storage amount ≧ C2
+ Δ, that is, when the charged amount becomes larger than the target value C2 by a certain degree or more, the target generated amount by the power generation operation of the generator motor 2 is set to “0” (smaller than the current input power of the step-down converter 19). Value) (STEP4-
5). Note that the predetermined value (C2 + δ) to be compared with the current power storage amount of the first power storage device 5 in STEP4-4 is the same as the value in ST4 of FIG.
It is a value equal to or less than a predetermined value C1 to be compared in EP3-1 (C2
+ Δ ≦ C1).

Also, in STEP 4-4, the charged amount <C2 + δ
(At this time, C2−δ ≦ power storage amount <C2 + δ), that is, if the power storage amount is a value close to the target value C2, the target power generation amount by the power generation operation of the generator motor 2 is stepped down. To the current input power of the unit 19 (STE
P4-6).

As described above, the supervisory controller 12 which has set the target power generation amount of the generator motor 2 in the idling operation mode instructs the target power generation amount to the generator motor controller 9 (STEP 4-7).

At this time, the generator motor controller 9
From the generator motor 2 to the first power storage device, the power generation of the generator motor 2, which is obtained from the detection data of the current Igm and the voltage Vgm of the armature coil given from the G / M sensor 16, becomes the specified target power generation. Power supply to 5 side is PD
Controlled via U15. As a result, the generator motor 2 generates the power generation energy of the target power generation amount, and
The power is output to the first power storage device 5 via U15 (however, when the target power generation amount = 0, the power generation operation of the generator motor 2 is not performed).

In this idling operation mode, the engine controller 8 controls the rotation speed N of the engine 1.
While maintaining E at a required idling speed, the throttle opening θth of the engine 1 is adjusted so that an output of the engine 1 suitable for the target power generation amount during the power generation operation of the generator motor 2 is obtained.
And the like are controlled via the engine drive unit 14, and the engine 1
Is given to the rotor of the generator motor 2. Further, the transmission controller 10 controls the clutch 4 to be disconnected by the actuator 22.

Returning to the description of FIG. 2, when the operation mode of the vehicle is not the idling operation mode in STEP 2-2 (when the vehicle is running), the supervisory controller 12 shows the solid line r in FIG. The running resistance of the vehicle at the current vehicle speed Vcar (vehicle propulsion output required to drive the vehicle while maintaining the current vehicle speed Vcar) is determined according to the data table determined in advance as described above (STE).
P2-5).

Further, the general management controller 12 sets ST
When the engine 1 is operated with the throttle opening θth and the rotation speed NE proportional to the accelerator operation amount Ap, based on the current accelerator operation amount Ap obtained in EP2-1 and the current rotation speed NE of the engine 1. Then, the output generated by the engine 1 (hereinafter referred to as engine power) is obtained from a predetermined map (STEP 2-6). Note that the engine power is “0” when the accelerator operation amount Ap is sufficiently small (Ap ≒ 0).

Further, the overall management controller 12
The current accelerator operation amount Ap acquired in TEP2-1,
From the current rotational speed NE of the engine 1, the required total target propulsion output of the vehicle is obtained from a predetermined map (STEP 2-7). This target propulsion output is equivalent to the target output of the engine 1 when the vehicle is driven only by the output of the engine 1, and includes the output of the engine 1 and the auxiliary output by the assist operation of the generator motor 2. When running the vehicle, the engine 1
And the target value of the sum of the output of the generator motor 2 and the auxiliary output of the generator motor 2. This target propulsion output is also “0” when the accelerator operation amount Ap is sufficiently small (Ap ≒ 0).
It is.

Next, the supervising controller 12 executes the step-down converter 19 in exactly the same manner as in the above-mentioned STEP 2-3.
(STEP 2-8; see FIG. 3), the driving mode of the vehicle applies the kinetic energy of the vehicle to the generator motor 2 to perform a power generation operation (regenerative power generation operation) of the generator motor 2. At the same time, it is determined whether or not the vehicle is in a deceleration regeneration mode for decelerating the vehicle (STEP 2-9). This determination is made based on whether or not the engine power obtained in STEP 2-6 is “0”.
Is determined to be the deceleration regeneration mode.

In this determination, when the vehicle operation mode is the deceleration regeneration mode, the general management controller 1
2 performs control processing in the deceleration regeneration mode (STEP 2).
-10).

That is, the overall management controller 12
The target amount of power generated by the regenerative power generation operation of the
A predetermined map is obtained from the current vehicle speed Vcar acquired in EP2-1 and the rotational speed NE of the engine 1 (this is equal to the rotational speed of the generator motor 2) in the present embodiment, and the target power generation amount is determined by the generator motor. Instruct the controller 9. In addition, the supervisory controller 12 sets the target output of the engine 1 to “0” and instructs the engine controller 8 of this.

At this time, the engine controller 8 given the above instruction closes the throttle valve of the engine, stops the supply of fuel to the engine 1 and stops the ignition processing by the engine driving device 14. And the rotor of the generator motor 2 connected to the output shaft are driven to rotate by the kinetic energy of the vehicle transmitted from the drive wheels 7 of the vehicle.

Further, the generator motor controller 9 having been instructed with the target power generation amount controls the generator motor 2 so that the power generation amount of the generator motor 2 becomes the specified target power generation amount as in the case of the idling operation mode. From the first power storage device 5
The power supply to the side is controlled via the PDU 15. Thereby, the generator motor 2 performs a regenerative power generation operation with the target power generation amount, and outputs the generated energy to the first power storage device 5 via the PDU 15.

The generator motor 2 in the deceleration regeneration mode
Is basically larger than the input power of the step-down converter 19 (this corresponds to the power consumption of the circuit system including the second power storage device 6 and the low-voltage electronic device 18). It has been. On the other hand, when the operation mode of the vehicle is not the deceleration regeneration mode (when the engine power is greater than 0) in the determination in STEP 2-9, the supervisory controller 12 next sets the operation mode of the vehicle to the output of the engine 1 Is given to the generator motor 2 to appropriately perform the power generation operation of the generator motor 2 and determine whether or not the vehicle is in a cruise power generation mode in which the vehicle cruises (runs at a substantially constant speed) (STEP 2). -11). This determination is based on the STE
It is determined whether or not the engine power obtained in P2-6 is equal to or less than the running resistance obtained in STEP2-5. When engine power ≦ running resistance (when the engine power is in the region B in FIG. 8), It is determined that the mode is the cruise generation mode.

If the vehicle operation mode is the cruise power generation mode in this determination, the supervisory controller 12 performs control processing for the cruise power generation mode as follows (STEP 2-12).

That is, referring to the flowchart of FIG. 5, first, the supervisory controller 12 starts the operation of the first power storage device 5 from the current vehicle speed Vcar according to the data table of FIG. 7 in the same manner as in the idling operation mode. A target value C2 of the charged amount is obtained (STEP 5-1). In the data table of FIG. 7, the target value C2 of the charged amount at a normal vehicle speed (vehicle speed of about 90 to 100 km / h) when traveling on a highway is set to be higher than other vehicle speeds.

Further, as in the case of the idling operation mode, the supervisory controller 12 reduces the current amount of power stored in the first power storage device 5 by a predetermined value (C2-δ) smaller than the target value C2 by the predetermined amount δ. (See FIG. 7) (STEP 5-2). If the amount of stored power <C2-δ, the target amount of power generation by the power generation operation of the generator motor 2 is set to a value larger by a predetermined amount α2 than the current input power (= Ii · Vi) of the step-down converter 19. (STEP5-
3). In this case, in the present embodiment, the predetermined amount α2 is a marginal output of the engine power with respect to the running resistance (ST2 based on the engine power obtained in STEP2-6).
The current vehicle speed Vcar is determined from the map obtained by subtracting the running resistance obtained in EP2-5 and the current vehicle speed Vcar. That is, the predetermined amount α2 to be added to the input power of the step-down converter 19 in STEP5-3 is determined by the margin output and the vehicle speed Vca.
It is a value corresponding to r.

On the other hand, in STEP 5-2, the charged amount ≧ C2-δ
In the case of, the general management controller 12 further calculates the current power storage amount of the first power storage device 5 by the target value C2
Is compared with a predetermined value (C2 + δ) (see FIG. 7) larger by the predetermined amount δ (STEP 5-4), and the storage amount ≧ C2
+ Δ, that is, when the charged amount becomes larger than the target value C2 by a certain degree or more, the target generated amount by the power generation operation of the generator motor 2 is set to “0” (smaller than the current input power of the step-down converter 19). Value) (STEP5-
5).

Also, in STEP 5-4, the charged amount <C2 + δ
(At this time, C2−δ ≦ power storage amount <C2 + δ), that is, when the power storage amount is a value near the target value C2, the overall management controller 12 further The current input power is converted to the marginal output (=
It is compared with the standard power generation amount of the generator motor 2 obtained from a predetermined map from the engine power-running resistance) and the current vehicle speed Vcar (STEP 5-6). In this case, the standard power generation amount is basically set to a sufficiently small value, and the input power of the step-down converter 19 is usually equal to or larger than the standard power generation amount.

When the input power of the step-down converter 19 ≧ the standard power generation amount, the general control controller 12 sets the target power generation amount by the power generation operation of the generator motor 2 to the current input power of the step-down converter 19 ( STEP5-7), Step-down device 19
If the input power of the motor is smaller than the standard power generation, the generator motor 2
Is set to the above standard power generation (STEP 5).
-8).

As described above, the general management controller 12, which has set the target power generation amount of the generator motor 2 in the cruise power generation mode, instructs the target power generation amount to the generator motor controller 9 (STEP 5-9).

At this time, the generator motor controller 9
The power supply from the generator motor 2 to the first power storage device 5 is controlled via the PDU 15 as in the case of the idling operation mode. As a result, the generator motor 2 generates the generated energy of the target power generation amount and outputs it to the first power storage device 5 via the PDU 15 (however, when the target power generation amount = 0, the power generation of the generator motor 2 is performed). No action is taken).

In the cruise power generation mode,
The overall control controller 12 instructs the engine controller 8 on the output obtained by adding the output corresponding to the target power generation amount of the generator motor 2 to the target vehicle propulsion output obtained in STEP 2-7 as the target output of the engine 1. . The engine controller 8 refers to the data detected by the E / G sensor 13 and adjusts the throttle opening θth, fuel supply amount, and ignition timing of the engine 1 so that the engine 1 generates the specified target output. The output of the engine 1 is controlled by deciding it and instructing it to the engine driving device 14.

Returning to the description of FIG.
According to the determination of 1, when the driving mode of the vehicle is not the cruise power generation mode (engine power> running resistance. When the engine power is in the area A in FIG. 8), the overall management controller 12 determines the output of the engine 1 The driving wheels 7 of the vehicle are combined with the auxiliary output by the assist operation of the generator motor 2.
The control processing of the assist traveling mode is performed in which the vehicle is accelerated while transmitting to the vehicle (however, the assisting operation of the generator motor 2 may not be performed) (STEP 2-13). In this control process, the supervisory controller 12 performs the process shown in the flowchart of FIG.

That is, the overall management controller 12
First, the sharing ratio K of the auxiliary output by the assist operation of the generator motor 2 with respect to the target vehicle propulsion output obtained in STEP 2-7 (= auxiliary output / target vehicle propulsion output; 0 ≦ K <1)
Is obtained from the current power storage amount of the first power storage device 5 according to the data table in FIG. 9 (STEP 6-1). in this case,
The sharing ratio K is set to K = 0 when the amount of power stored in the first power storage device 5 is equal to or less than the predetermined lower limit Cmin, and basically, when the amount of stored power is larger than the lower limit Cmin, Is larger, the sharing ratio K is set to be larger.

Next, the supervisory controller 12 sets the value of the flag AS / FLG representing the permission / non-permission of the assist operation of the generator motor 2 to “1” and “0”, respectively, as “0” (flag AS / FLAG). The initial value of FLG is “0”), and the change amount ΔAp (change rate of the accelerator operation amount Ap) per unit time of the accelerator operation amount Ap obtained in each control cycle in STEP 2-1 is the operation amount. Acceleration of whether the accelerator pedal (not shown) of the vehicle is depressed relatively largely in a state where the assist operation of the generator motor 2 is not started, whether or not the value is larger than a predetermined value (> 0) on the increasing side of Ap. It is determined whether a request has occurred (STEP 6-2).
In this case, the change amount Δ of the accelerator operation amount Ap is
The predetermined value to be compared with Ap is set according to the vehicle speed Vcar,
Basically, the predetermined value is increased as the vehicle speed Vcar increases.

At this time, if the condition of STEP 6-2 is satisfied, the overall management controller 12
It is determined whether or not the sharing ratio K obtained in −1 is “0” (STEP 6-3). When K = 0, that is, when the power storage amount of the first power storage device 5 is small,
In the situation where it is difficult to perform the assist operation smoothly, the value of the flag AS / FLG is set to "0" to disallow the assist operation (STEP 6-4). Also, STEP
If K ≠ 0 (K> 0) in 6-3, that is, the first
When the power storage amount of the power storage device 5 is in a state where the assist operation of the generator motor 2 can be performed, the value of the flag AS / FLG is set to “1” to permit the assist operation (STEP 6).
-5).

On the other hand, when the condition of STEP 6-2 is not satisfied (the change amount ΔAp of the accelerator operation amount Ap is small, or the value of the flag AS / FLG is already set to “1”, and the assist operation is permitted. If you have), or
Flag AS / FLG in STEP6-4 or STEP6-5
After setting the value of
The value of the flag AS / FLG is determined (STEP 6-6). At this time, if AS / FLG = 1 (assisting operation is permitted), the target auxiliary output is set to a value obtained by multiplying the target vehicle propulsion output by the sharing ratio K during the assisting operation of the generator motor 2. (STEP 6-7), this target auxiliary output is instructed to the generator motor controller 9 (STEP 6-8).
The target auxiliary output may be corrected according to the throttle opening θth, the margin output, the vehicle speed Vcar, and the like, if necessary.

Also, in the judgment of STEP 6-6, AS / FLG =
When the value is 0 (assist operation is not permitted), the supervisory controller 12 performs the control processing of the cruise power generation mode (see FIG. 5) (STEP 6-9).

As described above, in STEP 6-8, the target auxiliary output of the generator motor 2 is
When the generator motor controller 9 instructs the first
The power is fed from the power storage device 5 to the generator motor 2 via the PDU 15 so that the assist operation of the generator motor 2 is performed, and the power storage is performed so that the auxiliary output generated by the generator motor 2 becomes the specified target auxiliary output. The amount of power supplied from the device 5 to the generator motor 2 (input power to the generator motor 2) is
Controlled via U15.

In this case, the general control controller 12 subtracts the target auxiliary output of the generator motor 2 determined in STEP 6-8 from the target vehicle propulsion output by the target output of the engine 1 (= the target vehicle propulsion output). -Target auxiliary output) and instructs it to the engine controller 8. Then, the engine controller 8 receiving this instruction
Determines the throttle opening degree θth, fuel supply amount, and ignition timing of the engine 1 so as to cause the engine 1 to generate the specified target output in the same manner as in the case of the cruise power generation mode described above. , The output of the engine 1 is controlled.

In step 6-9, the generator motor 2 in the case where the control processing in the cruise power generation mode is performed is performed.
The operation control of the engine 1 and the engine 1 are exactly the same as those described in the STEP 2-12.

By the operation of the system of the present embodiment described above, when the operation mode of the vehicle is the idling operation mode or the cruise generation mode, the amount of power stored in the first power storage device 5 is reduced to the target value C2. When it is within a predetermined range in the vicinity (C2−δ ≦ power storage amount <C2 +
In the case of δ), the target power generation amount of the generator motor 2 is basically set to the input power of the step-down converter 19 (this corresponds to the energy consumption of the second power storage device 6). Therefore,
In this case, the power generated by the power generation operation of the generator motor 2 is supplied to the second power storage device 6 via the step-down converter 19 without any excess or shortage. For this reason, the energy stored in the first power storage device 5 is not supplied to the second power storage device 6 and does not decrease, and the amount of power stored in the first power storage device 5 is equal to the target value C2.
It is held at an appropriate amount of stored power in the vicinity. As a result, when performing the assist operation of the generator motor 2, it is possible to prevent a situation in which the amount of power stored in the first power storage device 5 is insufficient and the smooth assist operation cannot be performed.

In the idling operation mode or the cruise generation mode, if the amount of power stored in the first power storage device 5 is lower than the predetermined value C2-δ, the target amount of power generation of the generator motor 2 is reduced by the step-down converter. 19 is set to a value obtained by adding a predetermined amount α1 or α2 to the input power of the step-down converter 19, a part of the energy generated by the power generation operation of the generator motor 2 (corresponding to the input power of the step-down converter 19) is reduced.
At the same time, the first power storage device 5 is charged with the remaining amount (equivalent to the predetermined amount α1 or α2). Therefore, the power storage amount of the first power storage device 5 returns to an appropriate power storage amount near the target value C2, and the power storage motor 5 can prepare for the assist operation of the generator motor 2.

Further, in the idling operation mode or the cruise generation mode, when the amount of power stored in the first power storage device 5 is equal to or more than the predetermined value C2 + δ,
Since the target power generation amount of the generator motor 2 is set to “0” and the power generation of the generator motor 2 is not performed, the energy consumption of the second power storage device 6 is reduced from the first power storage device 5 through the step-down device 19. Be replenished. In particular, in this case, when the charged amount of the first power storage device 5 is equal to or more than a predetermined value C1 (≧ C2 + δ) and is in a substantially fully charged state, the output voltage of the step-down converter 19 becomes higher than the high-side output voltage Vf (14.3V). ), The energy consumption from the first power storage device 5 to the second power storage device 6 is not only replenished to the second power storage device 6, but also the second power storage device 6 is further charged. The power storage amount of one power storage device 5 rapidly decreases toward the power storage amount near the target value C1. As a result, when the operation mode of the vehicle changes to the deceleration regeneration mode in which the regenerative power generation operation of the generator motor 2 is performed by the kinetic energy of the vehicle, the first power storage device 5 receives the power generation energy generated by the regenerative power generation operation of the generator motor 2. The first power storage device 5 can be charged with the power generated by the regenerative power generation operation without any trouble, and the energy efficiency of the vehicle can be improved. In the deceleration regeneration mode, part of the energy generated by the generator motor 2 is supplied to the second power storage device 6 via the step-down device 19, but most of the energy is charged to the first power storage device 5.

As described above, in the hybrid vehicle according to the present embodiment, in the idling operation mode or the cruise generation mode, the power generation operation of the generator motor 2 according to the input power of the step-down converter 19 is performed, so that the first power storage device 5 2
While minimizing power supply to the power storage device 6 side, the first
The amount of power stored in power storage device 5 can be maintained at an appropriate amount near target value C1. As a result, the stored energy of the first power storage device 5 can be effectively used for the assist operation of the generator motor 2 as much as possible, and the regenerative generation energy of the generator motor 2 in the deceleration regeneration mode is reduced to the first as much as possible. The energy storage device 5 can be charged to increase the energy efficiency of the vehicle.

The operation described above is an operation at the time of driving the vehicle. In the present embodiment, the following operation is performed when the engine 1 is started at the start of the operation of the vehicle.

In the hybrid vehicle of the present embodiment, when the engine 1 is started, the generator motor controller 9 operates the generator motor 2 as a motor (starter motor).
Engine 1 is cranked.

At this time, the power supply system controller 11 monitors the charged amount of the first power storage device 5, and the charged amount is
If the power storage amount is equal to or less than a predetermined limit value at which the generator motor 2 can be operated as a starter motor, the booster 20 is operated to boost the stored energy of the second power storage device 6 and 1 Power is supplied to the power storage device 5 side. As a result, the stored energy of the second power storage device 6 becomes PD
The power is supplied to the generator motor 2 via U15, and the generator motor 2 can be operated as a starter motor without any trouble to start the engine 1.

In the hybrid vehicle of the present embodiment described above, the input power of the step-down converter 19 is used to determine the target power generation amount of the generator motor 2 in the idling operation mode or the cruise power generation mode. Alternatively, the output power of the step-down converter 19 may be used. In this case, the output voltage generated by the step-down
9 and the output current flowing to the second power storage device 6 side,
What is necessary is just to grasp | ascertain the output power of the step-down converter 19 by the product of those detection values.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an embodiment of a control device for a hybrid vehicle according to the present invention.

FIG. 2 is a flowchart for explaining the operation of the apparatus shown in FIG. 1;

FIG. 3 is a flowchart for explaining the operation of the apparatus of FIG. 1;

FIG. 4 is a flowchart for explaining the operation of the apparatus of FIG. 1;

FIG. 5 is a flowchart for explaining the operation of the apparatus of FIG. 1;

FIG. 6 is a flowchart for explaining the operation of the apparatus of FIG. 1;

FIG. 7 is a diagram for explaining the operation of the apparatus of FIG. 1;

FIG. 8 is a diagram for explaining the operation of the apparatus of FIG. 1;

FIG. 9 is a diagram for explaining the operation of the apparatus of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Generator motor, 5 ... 1st electric storage apparatus, 6
... second power storage device, 9 ... generator motor controller (generator motor control means), 12: general management controller (generator motor control means), 18: low-voltage electronic equipment, 19: step-down regulator, 20: booster.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yusuke Tatara 1-4-1, Chuo, Wako-shi, Saitama

Claims (8)

[Claims] An engine as a propulsion source of a vehicle, an operation as an electric motor for generating an auxiliary output transmitted to driving wheels of the vehicle together with an output of the engine, and an operation as a generator for generating power generation energy. A generator motor to perform, a first power storage device provided to supply power energy to the generator motor when the generator motor operates as a motor and to be able to charge the generated energy when the generator motor operates as a generator, A second power storage device provided so that the stored energy of the first power storage device or the generated energy of the generator motor can be charged via a step-down device; and a low-voltage electronic device that operates using the second power storage device as a power supply. In the control device for a hybrid vehicle, a target power generation amount when the generator motor operates as a generator is determined according to an input power amount to the step-down device or an output power amount of the step-down device. And a generator motor control means for controlling the generator motor based on the set target power generation amount. 2. The generator motor control means sets the target power generation amount in accordance with the input power amount to the step-down device or the output power amount of the step-down device, and sets the generator motor in accordance with an output of the engine to the generator. The control device for a hybrid vehicle according to claim 1, wherein the control is performed during a cruise running and / or an idling operation of the vehicle to be operated. 3. The generator motor control means changes the target power generation amount set according to the input power amount to the step-down converter or the output power amount of the step-down converter according to the storage amount of the first power storage device. 3. The method according to claim 1, further comprising:
A control device for a hybrid vehicle according to any one of the preceding claims. 4. The generator motor control means, when the amount of power stored in the first power storage device is within a predetermined range equal to or less than the amount of power stored in a fully charged state, the amount of input power to the step-down converter or The output power amount of the step-down device is set as the target power generation amount, and when the storage amount is smaller than the predetermined range, the target power generation amount is calculated based on the input power amount to the step-down device or the output power amount of the step-down device. 4. The control device for a hybrid vehicle according to claim 3, wherein the control unit also sets a large value. 5. The generator motor control means, when the amount of power stored in the first power storage device is within a predetermined range smaller than the amount of power stored in a fully charged state, the amount of input power to the voltage step-down device or the step-down voltage of the step-down device. The output power amount of the device is set as the target power generation amount, and when the power storage amount is larger than the predetermined range, the target power generation amount is set to be smaller than the input power amount to the step-down device or the output power amount of the step-down device. The control device for a hybrid vehicle according to claim 3, wherein the control device is set to a small value. 6. The generator motor control means, when the amount of power stored in the first power storage device is within a predetermined range smaller than the amount of power stored in a fully charged state, the amount of electric power input to the step-down converter or the voltage of the step-down converter. The output power amount of the device is set as the target power generation amount, and when the stored power amount is smaller than the predetermined range, the target power generation amount is set smaller than the input power amount to the step-down device or the output power amount of the step-down device. When the power storage amount is set to be larger than the predetermined range, the target power generation amount is set to be smaller than the input power amount to the step-down device or the output power amount of the step-down device. 4. The control device for a hybrid vehicle according to claim 3. 7. The step-down device is a step-down device whose output voltage can be controlled to a plurality of types of output voltages. When the first power storage device is substantially fully charged, the output voltage of the step-down device is changed to a high voltage side. 7. The control device for a hybrid vehicle according to claim 1, further comprising: means for controlling an output voltage of the hybrid vehicle. 8. The generator motor is provided so as to be able to start the engine by operation as the motor, and when the amount of power stored in the first power storage device decreases to a predetermined value or less at the time of starting the engine, The control device for a hybrid vehicle according to any one of claims 1 to 7, further comprising: means for charging the first power storage device from the second power storage device via a booster.