JP2000261909A - Control equipment of hybrid vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain proper control of automatic stop and of restart of an engine and four-wheel drive. SOLUTION: An engine 1 and a first motor generator 2, having a starting function of the engine 1, are connected with either one from among axles of front wheels and rear wheels, and a second motor generator is connected with the other axle. This hybrid vehicle has functions of automatic stop and restart of the engine 1. A means for calculating the driving force of an engine part, and a means for controlling the torque of the second motor generator 15 are installed. The control means controls the torque of the second motor generator 15 according to the calculated driving force of the engine part, when the engine is restarted from the stopped state and when a car is started.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for controlling the driving force of a hybrid vehicle in which one of front and rear wheels of a vehicle is driven by an engine and the other is driven by a motor. The present invention relates to a control device having an automatic stop and restart function of an engine for restarting the engine when stopping and starting.

[0002]

2. Description of the Related Art There have been many proposals for hybrid vehicles in which one of the front and rear wheels of a vehicle is driven by an engine and the other is driven by a motor. An example of such a vehicle is disclosed in Japanese Patent Application Laid-Open No. 8-237806.

[0003] In this system, a motor generator having both powering and power generation functions is connected to an engine, these are connected to an axle via a clutch mechanism, and another motor generator is connected to another axle via a differential device. Are linked.

By arranging the power sources on the front and rear wheels as described above, the degree of freedom in mounting on a vehicle is increased, and a function of four-wheel drive is added. In addition, functions such as stopping the engine at low load and regenerating energy at deceleration can be easily obtained.
Fuel efficiency and exhaust performance have also been improved.

[0005]

However, in such prior art, when starting from a stopped state of the engine while the vehicle is stopped, in order to start in a four-wheel drive state, motors with high output power on both front and rear wheels are required. (Motor generators) are required, and the capacity of the secondary battery for supplying power to them becomes large, which causes a problem that the vehicle becomes large and its weight increases.

On the other hand, when an automatic engine stop / restart system is applied in which the engine is automatically stopped when the vehicle stops and the engine is restarted when the vehicle starts moving, for example, the output of the engine is used together with the output to the motor generator on the engine side. Even when a vehicle with a small friction coefficient is used, the driving force distribution of the front and rear wheels changes with the time from the start of the vehicle until the engine rotates independently at the time of start, so it is difficult to control the vehicle especially on a road surface with a low friction coefficient There is a problem.

An object of the present invention is to solve such a problem.

[0008]

According to a first aspect of the present invention, an engine is connected to one of axles of front and rear wheels, and a first motor generator having an engine starting function is connected to an output shaft of the engine. A second motor generator capable of generating a driving force is connected to the axle of the vehicle, and the engine is automatically stopped when the vehicle stops and the engine is restarted when the vehicle starts moving. Unit driving force calculation means, and motor driving force control means for controlling the torque of the second motor generator, wherein the motor driving force control means uses the calculated engine unit when restarting from engine stop and starting the vehicle. The torque of the second motor generator is controlled according to the driving force.

In a second aspect based on the first aspect, there is provided an accelerator operation amount detecting means for detecting a driver's acceleration request, and the motor driving force control means is adapted to operate the accelerator operation at the time of restart from engine stop and starting of the vehicle. If there is no amount, the torque of the second motor generator is controlled so that the sum of the driving force by the engine unit and the driving force by the second motor generator becomes constant.

[0010] In a third aspect based on the first aspect, there is provided an accelerator operation amount detecting means for detecting a driver's acceleration request, wherein the motor driving force control means is adapted to operate the accelerator operation at the time of restart from engine stop and starting of the vehicle. If there is an amount, the torque of the second motor generator is controlled such that the second motor generator generates a driving force corresponding to a delay with respect to a response of the driving force by the engine unit.

According to a fourth aspect of the present invention, a first motor generator having an engine start function is connected to one of the axles of the front and rear wheels and an output shaft of the engine, and a driving force is applied to the other axle. A second motor generator that can be generated is connected, and an automatic stop and restart function of the engine, which automatically stops the engine when the vehicle stops and restarts the engine when the vehicle starts, and a function selection capable of selecting a four-wheel drive function In the hybrid vehicle provided with the means, when the four-wheel drive function is selected, an improper means for disabling automatic stop and restart of the engine is provided.

According to a fifth aspect, in the fourth aspect, when the four-wheel drive function is selected, the first motor generator is controlled to generate power and the generated power is supplied to the second motor generator. And a drive control unit.

According to a sixth aspect of the present invention, a first motor generator having an engine starting function is connected to one of the axles of the front and rear wheels and an output shaft of the engine, and a driving force is applied to the other axle. A second motor generator that can be generated is connected, and an automatic stop and restart function of the engine, which automatically stops the engine when the vehicle stops and restarts the engine when the vehicle starts, and a function selection capable of selecting a four-wheel drive function Means for detecting the rotational speed deviation of the axles of the front and rear wheels, an automatic stop and restart function of the engine is selected, and the rotational speed deviation of the axles of the front and rear wheels is a predetermined value. In the following case, there is provided a disabling means for disabling generation of the driving force by the second motor generator.

According to a seventh aspect of the present invention, a first motor generator having an engine starting function is connected to one of the axles of the front and rear wheels and an output shaft of the engine, and a driving force is applied to the other axle. A second motor generator that can be generated is connected, and an automatic stop and restart function of the engine, which automatically stops the engine when the vehicle stops and restarts the engine when the vehicle starts, and a function selection capable of selecting a four-wheel drive function Means for detecting the outside air temperature in a hybrid vehicle provided with the means, and when the outside air temperature is equal to or lower than a predetermined value, automatic stop and restart of the engine are disabled and four-wheel drive for performing four-wheel drive control Control means.

[0015]

According to the first to third aspects of the present invention, when the engine is restarted from a stop and there is no accelerator operation amount at the time of starting the vehicle, the creep torque is supplemented by the second motor generator to the rising of the engine rotation. Therefore, a smooth starting state of the vehicle due to the creep torque can be obtained. Also, when the accelerator is depressed when restarting from the engine stop and when starting the vehicle, the vehicle is started according to the increase in the engine rotation, and the driving by the second motor generator is performed in response to a delay in the response of the driving force by the engine unit. Power is given. Accordingly, a smooth start performance can be ensured even in a state requiring four-wheel drive without increasing the capacity of the secondary battery that supplies power to each motor generator, and vehicle stability can be improved.

According to the fourth aspect, when the four-wheel drive function is selected, the automatic stop and restart of the engine are disabled, so that the four-wheel drive function can be maintained from the time of starting, and the starting performance is improved. I do.

According to the fifth invention, for four-wheel drive,
The capacity of the secondary battery can be reduced.

According to the sixth aspect, when the automatic stop and restart functions of the engine are selected, the four-wheel drive is limited, so that the capacity of the secondary battery can be further reduced, and each motor generator can be used. Can be downsized.

According to the seventh aspect, when the outside air temperature is low, the four-wheel drive control is performed preferentially without automatically stopping and restarting the engine, so that a four-wheel drive function such as a frozen road surface is required. Good starting performance on a road surface condition.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a first motor generator 2 having both functions of a generator and a motor is provided between the engine 1 and the continuously variable automatic transmission 3.

The first motor generator 2 includes an engine 1
Of the engine 1
And rotate synchronously. The continuously variable automatic transmission 3 includes a torque converter 4, a forward / reverse switching clutch 5, and a belt-type continuously variable transmission 6. The drive torque of the engine 1 is applied to one of the front and rear wheels via these components. For example, it transmits to the drive shaft 7 of the front wheel) and the tire 8.

The first motor generator 2 is functionally equivalent even when connected to the crankshaft of the engine 1 via a belt or a chain. Further, a stepped automatic transmission may be used instead of the continuously variable automatic transmission 3.

A second motor generator 15 is connected to the drive shaft 17 of the other of the front and rear wheels (for example, the rear wheel) via a differential 16 so that the driving torque of the second motor generator 15 is transmitted to the differential 16 Through the drive shaft 17 and the tire 18.

The first motor generator 2 is driven by the first motor controller 12, and the second motor generator 15 is driven (electrically operated) by the second motor controller 14.
Alternatively, the electric power is driven (power generation operation), and the electric power is supplied from or charged to the battery 13.

Reference numeral 9 denotes a rotation speed sensor for detecting the rotation speed of the engine 1 (the rotation speed of the motor generator 2), 11 a brake sensor for detecting the amount of depression of a brake pedal (not shown) of the vehicle, and 21 an accelerator pedal (not shown). No), an accelerator operation amount sensor 22 for detecting the operation amount, a front wheel rotation sensor 22 for detecting the rotation speed of the drive shaft 7 of the front wheel, and a rear wheel rotation sensor 23 for detecting the rotation speed of the drive shaft 17 of the rear wheel. These signals are transmitted to the integrated controller 10 which controls the entire power train of the vehicle.
To enter.

The integrated controller 10 is linked with a control unit of an engine (not shown) and a control unit of an automatic transmission (not shown). Based on the sensor signals and the switch signals, the first motor controller 1
2. Output the target torque and the target rotation speed of each of the motor generators 2 and 15 to the second motor controller 14,
Motor controller 12, second motor controller 14
, Control of the motor generators 2 and 15, that is, start / start control and four-wheel drive control from the engine stop state.

Next, the contents of the start / start control from the engine stopped state will be described.

This control is applied to a system having an automatic stop and restart function of the engine for automatically stopping the engine when the vehicle stops and restarting the engine when starting the vehicle.

When the vehicle is temporarily stopped after the warm-up operation is completed, the driver automatically depresses the brake pedal and the vehicle speed becomes almost 0 km / h. When the rotation speed of the vehicle is at the idle rotation speed, the fuel injection of the engine is stopped after a predetermined time to temporarily stop the engine, and when the driver releases the brake pedal when starting the vehicle thereafter (selection). The lever is used to restart the engine, etc.).

The fuel injection and ignition of the engine are controlled by the control unit of the engine.

As shown in the flowchart of FIG. 2 (executed at a predetermined control cycle), first, in steps 1 and 2, it is checked whether or not there is a request to start the engine 1 while the engine 1 is stopped.
That is, when the brake sensor 11 is turned off (the brake pedal is released), it is determined that there is a start request.

If there is a request to start the engine 1, at step 3, a command to start the engine 1 is issued to the engine control unit and the first motor controller 12, and at step 4, the accelerator operation amount θ is read.

In response to the start command, the first motor controller 12 drives the first motor generator 2 by applying a target rotation speed or a target torque to the first motor generator 2 so as to start the engine 1 and make the engine 1 self-support at the highest speed.
The engine control unit performs fuel injection control and ignition control. The drive of the first motor generator 2 and the start of the engine cause the output of the torque converter 4 of the continuously variable automatic transmission 3 to output the engine speed of 2 as described later.
Creep torque is generated in proportion to the power.

In step 5, the accelerator operation amount θ is compared with a predetermined value θ1 which is almost zero.

When the accelerator operation amount θ is equal to or smaller than the predetermined value θ1, that is, when the vehicle is in a creep running state, in steps 6 and 7,
The engine speed Ne is read, and it is determined whether the engine speed Ne is equal to or less than the target speed Ne1. The target rotation speed Ne1 is set to the idle rotation speed or a predetermined value in the vicinity thereof.

If the engine speed Ne is equal to or less than the target speed Ne1, the routine proceeds to steps 8 to 10. In step 8, the driving force of the front wheels by the engine unit (engine 1, first motor generator 2) is calculated.

In this case, the transmission torque of the torque converter 4 of the continuously variable automatic transmission 3 is obtained by α (constant) × τ (torque capacity coefficient of torque converter) × Ne ² , and the torque converter is calculated by the square of the engine speed Ne. 4 is determined. The driving force changes depending on the speed ratio of the continuously variable transmission 6, but the speed ratio is the lowest constant value near the time of starting, so that the driving force has a characteristic as shown in FIG. 3 with respect to the engine speed Ne. . Therefore, the engine speed Ne
, A driving force is obtained by searching a map set in advance to the characteristics as shown in FIG.

In step 9, the required torque T1 of the second motor generator 15 (M / G2) is set. this is,
The second motor generator 15 provides the rear wheel with the driving force of the front wheel by the engine unit so as to supplement the target driving force, that is, the driving force at the engine idle speed Ne1. The required torque T1 of the second motor generator 15 is set so that the sum of the driving force of the front wheels by the unit and the driving force of the rear wheels by the second motor generator 15 becomes the constant target driving force. That is, according to the driving force of the front wheels by the engine unit, a map set in advance to characteristics such as a-b in FIG. 4 is searched to obtain the required torque T1.

At step 10, the required torque T1 is instructed to the second motor controller 14 to control the torque of the second motor generator 15.

Therefore, when the brake pedal is released, the vehicle starts to start by creep running at the same time when the engine 1 is started.

When the engine speed Ne reaches the target speed Ne1, it is determined that the engine is completely independent, and the control in steps 8 to 10 is terminated. Thereafter, normal four-wheel drive control is performed according to the running conditions.

In the case of the required torque T1 of ad in FIG. 4, when the engine is started, the second motor generator 15 supplements all the driving force by the engine unit, but the brake pedal is released, that is, the brake is released. When the second motor generator 15 generates the corresponding torque at the same time when the braking force is released, a shock occurs. For this reason, when the driving force of the engine unit is very small immediately after the start of the engine, the necessary torque T1
May be set to gradually increase as shown by cd in FIG.
In addition, the second motor generator 1
5 may be given a torque equivalent to creep or less.

On the other hand, if the accelerator operation amount θ is larger than the predetermined value θ1 in step 5, the vehicle is in an acceleration request state. In this case, in steps 11 to 13, the target rotation speed Ne2 is calculated based on the accelerator operation amount θ. , The engine speed Ne is read, and the engine speed Ne is set to the target speed N.
See if it is below e2.

When the engine speed Ne is equal to or lower than the target speed Ne2, the routine proceeds to steps 14-18. Step 14
Then, using the same map as in step 8, the driving force of the front wheels by the engine unit is calculated based on the engine speed Ne.

In step 15, the allowable torque Tmax of the second motor generator 15 is set. This allowable torque Tmax is calculated based on the driving force of the front wheels by the engine unit.
A limit value that is set so as not to impair the running stability of the vehicle. According to the driving force by the engine unit, the characteristic is set to be small when the driving force by the engine unit is small and large when it is large as shown in FIG. Search for the map you asked for. However, when the driving force of the engine unit is near 0, that is, immediately after the start and start, the allowable torque Tm as shown in FIG.
ax is set small.

In steps 16 and 17, the front wheel rotation speed and the rear wheel rotation speed are read, and the required torque T2 of the second motor generator 15 is set according to the deviation.

This is to ensure the four-wheel drive performance when the accelerator is depressed, and the rotational speed deviation between the front wheels and the rear wheels
According to (front wheel rotation speed−rear wheel rotation speed), a map is set by searching in advance such that the characteristic is set to 0 when the rotational speed deviation is 0 and to increase as the rotational speed deviation increases as shown in FIG. In other words, as the front wheels idle and the rotational speed deviation between the front wheels and the rear wheels increases at the time of starting, a larger torque is applied to the second motor generator 15. However, when T2 is equal to or greater than the allowable torque Tmax, T2 = Tmax.

In step 18, the required torque T2 is instructed to the second motor controller 14 to control the torque of the second motor generator 15.

Therefore, when the accelerator is depressed,
The vehicle starts as the engine speed increases, but when the front wheels idle, the driving force from the second motor generator 15 is applied to the rear wheels to start.

When the engine speed Ne reaches the target speed Ne2, the control of steps 14 to 18 is terminated. Thereafter, normal four-wheel drive control is performed according to the running conditions. In this case, in the control of steps 16 to 18, when there is a rotational speed deviation between the front wheel and the rear wheel, the driving force by the second motor generator 15 is applied to the rear wheel, that is, the second motor generator 15 applies the driving force to the rear wheel. In order to perform the torque control of the two-motor generator 15, the process smoothly shifts to the four-wheel drive control.

With this configuration, when the brake pedal is released (when the accelerator is not depressed) from a state where the engine 1 is stopped by the automatic stop function of the engine, the engine 1 is started by the restart function of the engine. At the same time, the creep torque is supplemented by the second motor generator 15 for the rising of the engine rotation.

Therefore, when the brake pedal is released, a smooth start of the vehicle is obtained by the creep torque. In addition, discomfort such as vehicle retreat on an uphill road is also eliminated.

On the other hand, if the accelerator pedal is depressed by releasing the brake pedal from the state where the engine 1 is stopped, the engine 1 is started by the restart function of the engine and the vehicle starts as the engine speed increases. However, in this case, the second
Driving force from motor generator 15 is applied to the rear wheels.

Therefore, when the engine 1 is stopped and the accelerator is depressed and started, a smooth start performance is ensured. Further, by setting the allowable torque, an excessive driving force by the second motor generator 15 is prevented. For this reason, the capacity of the secondary battery is reduced, and the vehicle stability due to the difference in driving torque between the front and rear wheels is also improved.

FIG. 7 shows a second embodiment of the present invention. This is the automatic engine stop and restart mode,
Mode selection switch 24 for selecting wheel drive mode
1 (see FIG. 1), and controls the engine 1, the second motor generator 15, and the second motor generator 15 based on the selection.

As shown in FIG. 7, in step 21, the signal of the mode selection switch 24 is read.

When the four-wheel drive mode is selected,
The process proceeds from step 22 to step 23 and thereafter so as to perform four-wheel drive control.

In step 23, an engine automatic stop prohibition flag for disabling the automatic stop and restart control of the engine is set [1].

In steps 24 and 25, the front wheel rotation speed and the rear wheel rotation speed are read to determine the necessity of four-wheel drive, that is, the operation of the second motor generator 15.

If there is a rotational speed deviation between the front wheels and the rear wheels, the second
Since the operation of the motor generator 15 is required, in step 26, the required torque of the second motor generator 15 is set according to the rotation speed deviation, and the required electric energy for operating the second motor generator 15 is calculated.

In step 27, the required torque is instructed to the second motor controller 14 to control the torque of the second motor generator 15.

In step 28, the first motor controller 12 is instructed of a required torque corresponding to the required amount of power of the second motor generator 15,
To control the power generation. This generated power is supplied to the second motor generator 15. In this case, the engine control unit is instructed to increase the amount of engine air in order to increase the load generated by the first motor generator 2.

In step 26, if there is substantially no rotational speed deviation between the front wheels and the rear wheels, and it is not necessary to operate the second motor generator 15, the routine returns.

On the other hand, if the four-wheel drive mode is not selected, the process proceeds from step 22 to step 29.

In step 29, it is determined whether or not the automatic stop and restart mode of the engine has been selected.

When the automatic stop and restart mode of the engine is selected, in step 30, the engine automatic stop prohibition flag is cleared [0]. That is, when predetermined conditions (warm-up condition, stop start condition, etc.) are satisfied, the engine is automatically stopped and restarted.

In steps 31 to 33, the front wheel rotation speed and the rear wheel rotation speed are read, and the deviation ΔNw is calculated.
Nw is compared with a predetermined value ΔNw1.

When the deviation ΔNw is equal to or larger than the predetermined value ΔNw1,
In steps 34 and 35, the second
The required torque of the motor generator 15 is set, and the required torque is instructed to the second motor controller 14 to control the torque of the second motor generator 15.

That is, when the automatic stop and restart mode of the engine is selected, the rotational speed deviation ΔN between the front wheels and the rear wheels is selected.
When w is small, four-wheel drive is not performed, and when w is large, four-wheel drive is performed. In this case, the predetermined value ΔN is set so that the range of the four-wheel drive is limited to the range that affects the running stability of the vehicle.
w1 may be set.

In this manner, when the driver selects the four-wheel drive mode, the engine does not automatically stop and restart in any state. Performance is improved. In the case of four-wheel drive, the power generated by the first motor generator 2 is supplied to the second motor generator 15, so that the capacity of the secondary battery can be reduced.

When the automatic stop and restart mode of the engine is selected, the range of four-wheel drive is limited (the rotational speed deviation between the front wheels and the rear wheels is equal to or more than a predetermined value). The capacity of the secondary battery for supplying power can be further reduced, and each of the motor generators 2,
15 can also be miniaturized.

During the automatic stop and restart control of the engine, the operation of the second motor generator 15 is started after the restart of the engine is completed and the engine becomes independent, that is, after the operation of the first motor generator 2 is completed. You may do it.

FIG. 8 shows a third embodiment of the present invention. This is the outside air temperature sensor 25 that detects the outside air temperature.
(See FIG. 1), the engine is automatically stopped and restarted based on the outside air temperature, and four-wheel drive is performed in a limited manner.

As shown in FIG. 8, at step 41, the outside air temperature Ta is read from the signal of the outside air temperature sensor 25, and at step 42, it is checked whether or not the outside air temperature Ta is below a predetermined value Ta1 (for example, below freezing).

When the outside air temperature Ta is cold at a predetermined value Ta1 or less, the routine proceeds to step 43 and thereafter, and proceeds to step 23 in FIG.
Similarly to the processing of steps 28 to 28, the automatic stop and restart control of the engine is disabled and the four-wheel drive control is performed.

On the other hand, when the outside air temperature Ta is higher than the predetermined value Ta1, the process proceeds to step 49 and thereafter, similarly to the processing of steps 30 to 35 in FIG.
When the stop and start conditions are satisfied, the engine is automatically stopped and restarted. In this case, when the rotational speed deviation ΔNw between the front wheels and the rear wheels is small, the four-wheel drive is not performed. Drive.

As described above, when the outside air temperature is low, if the four-wheel drive is preferentially performed without automatically stopping and restarting the engine, the road surface condition such as a frozen road surface condition is required. Good starting performance can be secured. In addition, by prohibiting the stop of the engine, it is possible to achieve compatibility with the vehicle interior heater performance when the outside air temperature is low.

Further, when the outside air temperature is high, the range of the four-wheel drive is limited by giving priority to the automatic stop and restart control of the engine, so that the capacity of the secondary battery and each Motor generators 2 and 15 can be downsized, and the fuel efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment.

FIG. 2 is a flowchart showing control contents.

FIG. 3 is a characteristic diagram illustrating a relationship between an engine speed and a driving force.

FIG. 4 is a characteristic diagram of a required torque T1 of a second motor generator.

FIG. 5 shows an allowable torque Tmax of a second motor generator.
FIG.

FIG. 6 is a characteristic diagram of a required torque T2 of the second motor generator.

FIG. 7 is a flowchart illustrating control contents according to the second embodiment.

FIG. 8 is a flowchart illustrating control contents according to the third embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 engine 2 first motor generator 3 continuously variable automatic transmission 4 torque converter 6 continuously variable transmission 8 tire 9 rotation speed sensor 10 integrated controller 11 brake sensor 12 first motor controller 13 battery 14 second motor controller 15 second motor generator 18 Tire 21 Accelerator operation amount sensor 22 Front wheel rotation sensor 23 Rear wheel rotation sensor 24 Mode selection switch 25 Outside air temperature sensor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02D 29/02 321 B60K 9/00 Z F02N 11/04 (72) Inventor Taiyo Yoshino Kanagawa, Kanagawa Prefecture Nissan Motor Co., Ltd., Nissan Motor Co., Ltd. (72) Inventor Masaaki Uchida 2, Takaracho, Kanagawa Ward, Yokohama, Kanagawa Prefecture Nissan Motor Co., Ltd. F-term (reference) 3D039 AA01 AA02 AA04 AA09 AB27 AC01 AC34 AC36 AD03 AD06 AD23 AD53 3G093 AA03 AA06 AA07 AA16 BA21 BA22 CA02 CA04 CB01 CB05 DA01 DA06 DB03 DB04 DB06 DB09 DB15 DB23 EA05 EB00 EB04 EC02 FA10 FA11 FB02 5H115 PA12 PC06 PG04 PI16 PI24 PI29 PO02 PO09 PU08 PU24 PU25 PU26 PV09 QE01 QE02 TB03 TE01 RE03 TO23

Claims (7)

[Claims] An engine is connected to one of the axles of the front and rear wheels, and a first motor generator having an engine starting function is connected to an output shaft of the engine, and a first motor generator capable of generating a driving force on the other axle. An engine unit driving force calculation means for calculating a driving force by an engine unit in a hybrid vehicle to which the motor generator is connected, the engine is automatically stopped when the vehicle stops and the engine is restarted when the vehicle starts. Motor driving force control means for controlling the torque of the motor generator, wherein the motor driving force control means controls the second motor generator in accordance with the calculated driving force of the engine unit when the engine is restarted and the vehicle is started. A control device for a hybrid vehicle, characterized by controlling a torque of the vehicle. 2. An accelerator operation amount detecting means for detecting a driver's request for acceleration, wherein the motor driving force control means detects an accelerator operation amount when the engine is restarted from a stop and there is no accelerator operation amount when the vehicle starts. The control device for a hybrid vehicle according to claim 1, wherein the torque of the second motor generator is controlled such that the sum of the driving force and the driving force by the second motor generator is constant. 3. An accelerator operation amount detecting means for detecting a driver's acceleration request, wherein the motor driving force control means is configured to perform a second operation when there is an accelerator operation amount at the time of restart from engine stop and starting of the vehicle. The control device for a hybrid vehicle according to claim 1, wherein the torque of the second motor generator is controlled so that the motor generator generates a driving force corresponding to a delay with respect to a response of the driving force by the engine unit. 4. A first motor generator having an engine connected to one of front and rear axles and having an engine starting function connected to an output shaft of the engine, and capable of generating a driving force on the other axle. And a function selecting means for selecting an automatic stop and restart function of the engine for automatically stopping the engine when the vehicle stops and restarting the engine when starting the vehicle, and a four-wheel drive function. A hybrid vehicle control device comprising: a hybrid vehicle, comprising: a disabling unit that disables automatic stop and restart of an engine when a four-wheel drive function is selected. 5. When the four-wheel drive function is selected, the first
The control device for a hybrid vehicle according to claim 4, further comprising: a four-wheel drive control unit that controls power generation of the motor generator of (1) and supplies the generated power to the second motor generator. 6. A first motor generator having an engine connected to one of axles of front and rear wheels and having an engine starting function connected to an output shaft of the engine, and capable of generating a driving force on the other axle. And a function selecting means for selecting an automatic stop and restart function of the engine for automatically stopping the engine when the vehicle stops and restarting the engine when starting the vehicle, and a four-wheel drive function. In a hybrid vehicle, when a rotational speed deviation detecting means for detecting a rotational speed deviation of an axle of front and rear wheels and an automatic stop and restart function of an engine are selected and a rotational speed deviation of an axle of front and rear wheels is equal to or less than a predetermined value. And a disabling means for disabling generation of driving force by the second motor generator. 7. A first motor generator having an engine connected to one of front and rear axles and having an engine starting function connected to an output shaft of the engine, and capable of generating a driving force on the other axle. And a function selecting means for selecting an automatic stop and restart function of the engine for automatically stopping the engine when the vehicle stops and restarting the engine when starting the vehicle, and a four-wheel drive function. In a hybrid vehicle, an outside air temperature detecting unit that detects an outside air temperature, and a four-wheel drive control unit that disables automatic stop and restart of the engine and performs four-wheel drive control when the outside air temperature is equal to or lower than a predetermined value. A control device for a hybrid vehicle, comprising: