JP2000127790A - Drive control device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the fuel consumption rate and the running stability so as to be compatible with each other in a vehicle in which wheels driven by an engine are independent from wheels driven by a motor. SOLUTION: A drive control device comprises first wheels 6 driven by an engine 1, a generator 13, a motor 7 operated by electric power produced from the generator 13, and second wheels 11 driven by the motor 14. Whether the second wheels 11 should be driven by the motor 7 or not is predicted, and if it is true, the generator 13 is operated so as to cause the motor 7 to drive the wheels 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive control device for a vehicle in which wheels are driven by a motor, and more particularly, to a multi-wheel drive vehicle in which wheels driven by an engine and wheels driven by a motor are independent, or a motor alone. The present invention relates to a drive control device for a vehicle that drives wheels by using the same.

[0002]

2. Description of the Related Art As a vehicle equipped with an engine, there is known a multi-wheel drive vehicle that drives front and rear wheels by distributing engine torque to front and rear wheels via a power distribution mechanism (transfer). ing. According to such a multi-wheel drive vehicle, the traction cushion at the time of starting or running on a low μ road can be improved, and the running stability of the vehicle can be improved.

However, the above-mentioned multi-wheel drive vehicle has a problem that the weight of the vehicle increases due to a power distribution mechanism (transfer) and the like, and that the drag loss of the engine increases and the fuel consumption rate decreases.

To solve such a problem, the front wheels of the vehicle are driven by a motor and the rear wheels of the vehicle are driven by an engine, or the front wheels of the vehicle are driven by an engine and the rear wheels of the vehicle are driven by a motor. A wheel drive hybrid vehicle is known.

According to such a hybrid vehicle, since the engine only needs to drive the front wheels or the rear wheels, a power distribution mechanism is not required, the vehicle weight is reduced, the engine drag loss is reduced, and the fuel consumption rate is reduced. Can be improved.

[0006]

The above-described four-wheel drive hybrid vehicle can be easily switched to the four-wheel drive only when necessary, but has a problem that a large amount of power is consumed during the four-wheel drive. As a result, the size of the battery for driving the motor may increase, which may be disadvantageous even when the battery is mounted on a vehicle.

[0007] The present invention has been made in view of the above-described problems, and the wheels driven by the engine and the wheels driven by the motor are independent, and only the engine is used in accordance with the running conditions of the vehicle. In a vehicle drive control device that switches between driving, driving by an engine and a motor, and independent driving of wheels only by a motor, miniaturization of a battery and improvement of running stability are achieved by minimizing battery power consumption. The purpose is to achieve both.

[0008]

The present invention employs the following means to solve the above-mentioned problems. That is, the drive control device for a vehicle according to the present invention includes: an engine;
A drive control device for a vehicle including a first wheel driven by the engine, a generator, a motor operated by energy generated by the generator, and a second wheel driven by the motor. Predicting means for predicting whether or not driving of the second wheel by the motor is required; and operating the generator when the predicting means predicts that driving of the second wheel by the motor is necessary. And motor drive control means for driving wheels by the motor.

In the drive control device configured as described above,
The predicting means determines whether or not driving of the second wheel by the motor is necessary, for example, whether or not multi-wheel driving by driving of the first wheel by the engine and driving of the second wheel by the motor is necessary, or It is determined whether or not it is necessary to independently drive the second wheel.

At this time, the prediction means includes, for example,
It is determined whether or not it is necessary to drive the second wheel by the motor based on a low μ road determination, a slope determination, or the like. Then, when the prediction unit predicts that the second wheel needs to be driven by the motor, the motor drive control stage operates the generator and supplies the motor with the energy generated by the generator. As a result, the motor starts driving the second wheel, and the vehicle is switched to a multi-wheel drive state by the engine and the motor or a single-wheel drive state by the motor.

As described above, when the second wheel is required to be driven by the motor, the motor is operated by the energy generated by the generator. Therefore, it is possible to suppress the consumption of battery power while ensuring the running stability of the vehicle. it can.
On the other hand, when the driving of the second wheel by the motor is unnecessary, the motor is not operated, so that the consumption of electric energy can be minimized. Further, when the wheels are driven independently by the motor, the engine can be stopped, so that the fuel consumption rate is improved.

Further, a drive control device for a vehicle according to the present invention includes an engine and a first drive device driven by the engine.
A wheel, a generator, a motor operated by energy generated by the generator, and a second wheel driven by the motor is a drive control device for a vehicle, wherein the motor is connected to a battery, Motor drive control means for operating the generator to drive the second wheel by the motor, wherein the motor drive control means is configured to output the energy when the power generated by the generator is insufficient for the operation of the motor. The motor may be operated using electric energy stored in a battery. It is to be noted that the battery herein includes a capacitor formed of an electric double-layer capacitor that allows easy input and output of a large current.

According to such a configuration, for example, when the amount of power generated by the generator is insufficient, such as when the vehicle starts, or when the wheels are slipping, it is necessary to immediately switch to multi-wheel drive. In such a case, by temporarily supplying the electric power of the battery to the motor, it is possible to compensate for a shortage of power generation by the generator, a delay in the operation of the generator, and the like.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing a schematic configuration of a vehicle to which a drive control device according to the present invention is applied. In the vehicle shown in FIG. 1, a front wheel (second wheel) is driven by a motor 36, and a rear wheel (first wheel) is driven by an engine (E / E /
G) A four-wheel drive hybrid vehicle driven by 1.

The engine (E / G) 1 includes an automatic transmission (automatic transmission:
A / T) 2 is connected, and the automatic transmission (A / T) 2
The propeller shaft 6 is connected.

The propeller shaft 6 is connected to the rear differential gear 4. Left and right drive shafts 5 are connected to the rear differential gear 4,
A rear wheel 6 is connected to each drive shaft 5.

In this case, the power of the engine (E / G) 1 is transmitted to a propeller shaft 6 through an automatic transmission (A / T) 2, and then through a differential gear 8 and a drive shaft 9. 6 is transmitted.

Here, the automatic transmission (A / T) 2 includes, for example, a torque converter 301 and a gear transmission as shown in FIG. The gear transmission is configured by combining a planetary gear mechanism, a clutch, a brake, and the like, and is configured to select a gear and select forward / reverse.

The torque converter 301 is provided with a lock-up clutch 305, and when the vehicle speed exceeds a certain value, the lock-up clutch 305 is engaged to connect the output shaft of the engine 1 and the output shaft of the torque converter 301. It is designed to be directly connected.

The gear transmission includes an auxiliary transmission section 200 connected to a torque converter 301 and a main transmission section 210 following the auxiliary transmission section 200. The sub transmission unit 200
An input shaft 28 of a gear transmission having an overdrive planetary gear mechanism 29 connected to the torque converter 301
Are connected to the carrier 30 of the overdrive planetary gear mechanism 29.

The planetary gear mechanism 29 includes a ring gear 32 having internal teeth on an inner peripheral surface, a sun gear 31 disposed in the ring gear 32, and a carrier 30 disposed between the sun gear 31 and the ring gear 32. And a pinion gear (not shown) held by the pinion gear. The pinion gear is configured to relatively rotate around the sun gear 31 while meshing with the sun gear 31 and the ring gear 32.

Between the carrier 30 and the sun gear 31,
A multi-plate clutch C0 and a one-way clutch F0 are provided. The one-way clutch F0 is engaged when the sun gear 31 rotates forward relative to the carrier 30 (rotates in the rotation direction of the input shaft 28).

The auxiliary transmission unit 200 includes a sun gear 31.
Is provided with a multiple disc brake B0 for selectively stopping the rotation of the vehicle. The ring gear 32, which is an output element of the sub transmission unit 200, is connected to the intermediate shaft 3, which is an input element of the main transmission unit 210.
3 is connected.

In the sub-transmission 200 constructed as described above, the multi-plate clutch C0 or the one-way clutch F0
Is engaged, the entire planetary gear mechanism 29 rotates integrally, so that the intermediate shaft 33 rotates at the same speed as the input shaft 28, and is in the low speed stage. .

In the auxiliary transmission section 200, the brake B0
Are engaged and the rotation of the sun gear 31 is stopped, the ring gear 32 is rotated forward with the speed increased with respect to the input shaft 28, and a high speed stage is established.

Next, the main transmission unit 210 is connected to the planetary gear mechanism 2.
There are provided three sets of planetary gear mechanisms 40, 50, 60 having the same structure as that of No. 9, and their rotating elements are connected as follows. That is, the sun gear 4 of the first planetary gear mechanism 40
1 and the sun gear 51 of the second planetary gear mechanism 50 are integrally connected to each other, and the ring gear 43 of the first planetary gear mechanism 40, the carrier 52 of the second planetary gear mechanism 50, and the carrier 62 of the third planetary gear mechanism 60. , And the output shaft 65 is connected to the carrier 62. Further, the ring gear 53 of the second planetary gear mechanism 50 is connected to the sun gear 61 of the third planetary gear mechanism 60.

In the gear train of the main transmission unit 210 described above, five forward speeds and two reverse speeds can be set, and clutches and brakes for this are provided as follows.

First, the clutch will be described. The ring gear 53 of the second planetary gear mechanism
And the sun gear 61 and the intermediate shaft 3 of the third planetary gear mechanism 60
3 is provided with a first clutch C1 (forward clutch). In addition, the first planetary gear mechanism 4
A second clutch C2 is provided between the intermediate shaft 33 and the sun gear 41 of the second planetary gear mechanism 50 and the sun gear 41 of the second planetary gear mechanism 50.

Next, the brake will be described. The first brake B1 is a band brake, and the sun gears 41 and 5 of the first planetary gear mechanism 40 and the second planetary gear mechanism 50.
1 is arranged to stop rotation. A first one-way clutch F1 and a second brake B2, which is a multi-disc brake, are arranged in series between the sun gears 41 and 51 (that is, the common sun gear shaft) and the casing 66. One-way clutch F1 has sun gears 41 and 51
Rotates in the reverse direction (rotation in the direction opposite to the rotation direction of the input shaft 28)
It is designed to engage when trying.

A third brake B3, which is a multi-plate brake, is provided between the carrier 42 of the first planetary gear mechanism 40 and the casing 66. As means for stopping the rotation of the ring gear 63 of the third planetary gear mechanism 60, a fourth brake B4, which is a multi-plate brake, and a second one-way clutch F2 are arranged in parallel between the casing 66. The second one-way clutch F2 is engaged when the ring gear 63 is about to rotate in the reverse direction. still,
In FIG. 2, S1 is a turbine speed sensor,
Reference numeral 2 denotes an output shaft speed sensor.

The automatic transmission (A / T) 2 sets five forward speeds and two reverse speeds by engaging and disengaging the clutches and brakes as shown in the operation chart of FIG. be able to. In FIG. 3, the mark 印 indicates the engaged state, and the mark ◎
The mark indicates the engaged state during engine braking, the mark indicates the engaged state but not related to power transmission, and the blank indicates the released state.

The selection of the gear position in the automatic transmission (A / T) 2 can be performed by a select lever (not shown) installed in the vehicle interior. As shown in FIG. 4, the position arrangement of the select lever includes a parking (P) position, a reverse (R) position,
Neutral (N) position, then drive (D)
Positions are arranged, and a manual (M) position is arranged following the drive (D) position at a position perpendicular to these arrangement directions. Subsequently, in parallel with the arrangement direction from the parking (P) position to the drive (D) position, three positions are arranged following the manual (M) position, and three positions are oblique to the arrangement direction. Successively, two positions and then a low (L) position are arranged.

Of these positions, the reverse gear position is selected at the R position, and 1 at the D position.
The five forward speeds from the first speed to the fifth speed are selected according to the traveling state, the four forward speeds from the first speed to the fourth speed are selected according to the traveling state in the fourth position, and the one forward speed is selected in the three positions. The three forward speeds from the first speed to the third speed are selected according to the traveling state, and then the two forward speeds from the first speed to the second speed are selected according to the traveling state at the two positions.
In the position, the first forward speed of only the first speed is selected.

In the M position, the shift mode is the sport mode, and as shown in FIG. 5, a shift down switch 71 provided on the front surface of the spoke portion of the steering wheel 70 in the vehicle interior and the rear surface of the spoke portion are provided. When the upshift switch 72 is operated, downshifting and upshifting are enabled.

Returning now to FIG. 1, the output shaft 8 of the motor 7
Are connected to a front differential gear 9. Left and right drive shafts 10 are connected to the front differential gear 9, and a front wheel 11 is connected to each drive shaft 10. In this case, the rotational torque of the motor 7 is transmitted from the output shaft 8 to the front differential gear 9, and then transmitted from the front differential gear 9 to the front wheels 11 via the drive shaft 10.

The motor 7 has two inverters (I1) 12 and (I2) 14 (hereinafter referred to as inverters (I
1) 12 to the first inverter (I1) 12, the inverter (I
2) is electrically connected to a second inverter (I2) 14).

The first inverter (I1) 12 has a motor / generator (M / M) functioning as a motor and a generator.
G) 13 and a battery 15 as a power source are electrically connected. The motor generator (M / G) 1
3 is mechanically connected to the crankshaft 17 of the engine (E / G) 1. Specifically, as shown in FIG. 6, a torque converter input unit 19 of the automatic transmission (A / T) 2 is connected to a crankshaft 17 of the engine (E / G) 1 via an electromagnetic clutch 18. At the same time, a motor generator (M / G) 13 is connected to the electromagnetic clutch 18 via an electromagnetic clutch 20 and a reduction gear 21.

The motor generator (M / G) 13
Means that when the engine (E / G) 1 is started, the electromagnetic clutch 1
It functions as a starter motor in a state where the clutches 8 and 20 are engaged, and functions as a generator in a state where the electromagnetic clutch 20 is engaged when the vehicle is running at a reduced speed.

The reduction gear 21 is of a planetary gear type and includes a sun gear 21c, a carrier 21d, and a ring gear 21e.
It is connected to a motor generator (M / G) 13 via a brake 21a and a one-way clutch 21b.

When the motor / generator (M / G) 13 functions as a starter motor, the reduction gear 21 engages the brake 21a to reduce the rotational torque of the motor / generator (M / G) 13. Is transmitted from the sun gear 21c to the carrier 21d at reduced speed. According to the reduction gear transmission 21, the motor generator (M /
Even if the sizes of the G) 13 and the inverter 4 are reduced, it is possible to secure sufficient torque for cranking the engine (E / G) 1.

Further, a motor generator (M / G) 1
3, a first inverter (I1) 12 is electrically connected. When the motor / generator (M / G) 13 operates as a motor, the first inverter (I1) 12 variably changes the power supplied from the battery 15 to the motor / generator (M / G) 13 by switching. I do.

The first inverter (I1) 12 is connected to a motor
When the generator (M / G) 13 is operated as a generator, the electric power is charged from the motor generator (M / G) 13 to the battery 15 and the electric power is supplied from the motor generator (M / G) 13 to the motor 7. The power supply is switched by switching.

The battery 15 has a second inverter (I
2) 14 is connected to the second inverter (I2)
Reference numeral 14 changes the power supplied to the motor 7 by switching.

The battery 15 includes a main battery 15a as a power supply for driving auxiliary equipment and a sub-battery 15b as a power supply for controlling auxiliary equipment, so that the main battery 15a and the sub-battery 15b can exchange power with each other. It has become. The voltage of the main battery 15a is higher than the voltage of the sub-battery 15b.
a is used as a drive power source for the motor 7.

Next, the engine (E / G) 1 includes an engine 1, an automatic transmission (A / T) 2, an electromagnetic clutch 18,
0, a brake 21a, an electronic control unit (ECU) 16 for controlling the first inverter (I2) 12, the second inverter (I2) 14, and the like. This ECU1
Reference numeral 6 includes, in addition to a central processing unit (CPU), a ROM storing a control program, a RAM for writing operation results, a backup RAM for backing up data, and the like, which are interconnected by a bidirectional bus. Be composed.

As shown in FIG. 7, the signals input to the ECU 16 include an output signal of the navigation system, each wheel speed signal, an engine speed (NE) signal, an engine water temperature signal, an ignition switch signal, a snow mode switch signal, SOC indicating charge amount of main battery 15a
(State Of Charge) signal, SOC signal indicating the amount of charge of the sub-battery 15b, headlight switch signal, defogger switch signal, air conditioner switch signal, vehicle speed signal, oil temperature signal for automatic transmission (A / T oil temperature) Signal), shift position signal, side brake on /
Off signal, foot brake on / off signal, catalyst temperature signal, accelerator opening signal, crank position signal, sports shift signal, output signal of vehicle acceleration sensor, on / off signal of four-wheel drive switch, turbine speed sensor And the like.

The ECU 16 determines the operating state of the engine 1, the state of the automatic transmission (A / T) 2, the running state of the vehicle, and the like based on the above-mentioned various signals. Ignition signal, injection signal for fuel injector, starter signal for starter motor, control signal for first inverter (I1) 12, control signal for second inverter (I2) 14, ABS actuator signal for ABS actuator, A / T solenoid It outputs a control signal, a control signal for the A / T line pressure control solenoid, a sports mode indicator signal for the sports mode indicator, and the like.

For example, the ECU 16 selects an optimum shift program according to the vehicle speed, the engine speed, the accelerator opening, the throttle valve opening, the acceleration / deceleration, etc., and sets the A / T solenoid for the A / T solenoid according to the selected shift program. The automatic transmission (A / T) 2 is controlled by outputting a / T solenoid signal, an A / T line pressure control solenoid signal for the A / T line pressure control solenoid, and the like.

The ECU 16 compares the engine rotational speed NE with the rotational speed NT of the turbine runner 303 of the torque converter 301 and determines the rotational speed of the turbine runner 303 as follows:
If NT is higher than the engine speed: NE, it is considered that the vehicle is in a decelerating running state, the electromagnetic clutch 20 is engaged, and the first inverter (I1) 12 is controlled so that the motor generator (M / G) 13 And the main battery 15a is charged with the regenerated power.

When the state of charge (SOC) of the main battery 15a falls below a predetermined value, the ECU 16 determines that the electromagnetic clutch 2
0 is engaged to transmit the rotational torque of the crankshaft 17 to the motor / generator (M / G) 13 so that the motor / generator (M / G) 13 acts as a generator, and the motor / generator (M / G) The first inverter (I1) 12 is controlled so that the power generated by the power supply 13 is charged in the main battery 15a.

Next, the ECU 16 normally operates the engine (E
/ G) The control is performed such that the vehicle runs only by driving the rear wheel 6 by 1. When the ECU 16 predicts that four-wheel drive traveling by rear wheel drive and front wheel drive is necessary, the ECU 16 drives the motor 7 to drive the front wheels 11.

Specifically, the ECU 16 starts the vehicle,
When running on a low μ road, running in snow mode, running on a slope, or the like is determined, it is predicted that four-wheel drive running is necessary. The start determination of the vehicle is based on the condition that when the vehicle speed is 0 and the shift position is in the non-neutral position among the D, M, 3, 2, L, and R positions, the foot brake signal is shifted from on to off. Is determined. The low μ road determination is made based on a change in the rotation speed of the wheels 6 and 11. The snow mode determination is made on the condition that the setting of the snow mode switch arranged in the vehicle compartment is ON or the snow mode setting based on the low μ road determination. Slope determination is made based on the difference between the reference acceleration determined from the accelerator opening signal and the vehicle speed signal and the actual acceleration, or the output signal of the navigation system. Thus, the ECU 16
Implements the prediction means according to the present invention.

When the ECU 16 determines that it is necessary to switch to four-wheel drive when traveling by two-wheel drive, the ECU 16 automatically switches from two-wheel drive to four-wheel drive. For example, the ECU 16 controls the front wheels 11 when the vehicle is not cornering.
When the difference between the rotation speed of the rear wheel 6 and the rotation speed of the rear wheel 6 becomes large, it is determined that the wheel is slipping, and the drive is switched from two-wheel drive to four-wheel drive.

Further, when a four-wheel drive switch (not shown) provided in the vehicle compartment is set to ON, the ECU 16 unconditionally operates the motor 7 to switch to four-wheel drive travel.

Next, when switching from two-wheel drive to four-wheel drive, the ECU 16 engages the electromagnetic clutch 20 and transmits the power of the engine (E / G) 1 to the motor generator (M / G) 13. And the first inverter (I1) 12 is controlled to control the motor / generator (M /
G) 13 acts as a generator, and the electric power generated by the motor generator (M / G) 13 is applied to the motor 7.

If the motor generator (M / G) 13 cannot obtain a sufficient amount of power generation, such as when the vehicle starts, the ECU 16 generates power using the motor generator (M / G). At the same time as applying the electric power to the motor 7, the second inverter (I2) 14 is controlled to apply the electric power of the main battery 15a to the motor 7, and as shown in FIG. 8, the main battery 15a and the motor generator ( M / G) 13 (hereinafter, such a manner of using the battery power properly is referred to as an auxiliary pattern A).

When it is necessary to immediately switch from two-wheel drive to four-wheel drive when the vehicle is running, the ECU 16 engages the electromagnetic clutch 20 to engage the engine (E / E / E).
G) The power of 1 is transmitted to the motor / generator (M / G) 13 and the first inverter (I1) 12 is controlled to cause the motor / generator (M / G) 13 to function as a generator. The power generated by the M / G 13 is applied to the motor 7.

Since there is a time lag from the start of the above-described control until the motor generator (M / G) 7 actually functions as a generator, the ECU 16
As shown in FIG. 9, the motor generator (M / G) 1
The main battery 15a is used as a power source until the 3 functions as a generator (hereinafter, such a manner of selectively using battery power is referred to as an auxiliary pattern B).

As described above, the ECU 16 implements the motor drive control means according to the present invention. On the other hand, the ECU 16
Means that when the four-wheel drive control is started based on the start determination, for example, the motor is driven on the condition that the vehicle is in a high-speed running state or the shift position is in a non-drive position such as the P or N position. Stop 7 and 4
The wheel drive control ends.

The operation and effect of the present embodiment will be described below. Here, a case will be described as an example in which the necessity of four-wheel drive is predicted based on the start determination of the vehicle. EC
U16 repeatedly executes the drive control routine shown in FIG. 10 every predetermined time. In this drive control routine, EC
U16 first performs input processing of various signals indicating the driving state in S1001, and then determines in S1002 whether or not the four-wheel drive switch is set to ON based on the input signal.

If it is determined in step S1002 that the four-wheel drive switch is set to off, the ECU 1
The process proceeds to S1003, where it is determined whether or not the state of charge (SOC) of the main battery 15a is equal to or less than a predetermined value (α%).

At S1003, the main battery 1
If the ECU 16 determines that the state of charge (SOC) is greater than the predetermined value (α%), the ECU 16 proceeds to S1004 and selects a vehicle speed signal, a shift position signal, and a foot brake ON signal from among the signals processed in S1001. / Off signals are extracted, and it is determined whether or not the vehicle is starting based on those signals.

If it is determined in step S1004 that the vehicle is not starting, the flow proceeds to step S1005, where the ECU 16 extracts the rotation speed signal of each wheel from the signals input in step S1001, and based on the signal, By performing wheel slip determination, it is determined whether automatic control switching from two-wheel drive control to four-wheel drive control is necessary.

If it is determined in S1005 that automatic control switching is not necessary, the ECU 16 proceeds to S1006 and performs control so that the motor generator (M / G) 13 does not act as a generator.

In this case, since the motor 7 does not drive the front wheels 11, the vehicle runs only with the rear wheels driven by the engine (E / G) 1. On the other hand, if it is determined in S1005 that the automatic control switching is necessary, the second inverter (I2) 1 according to the auxiliary pattern B shown in FIG.
4 to control the power of the main battery 15a to the motor 7
Is applied.

Subsequently, the ECU 16 proceeds to S1009, engages the electromagnetic clutch 20, controls the first inverter (I1) 12, and causes the motor generator (M / G) 13 to act as a generator.

In this case, the motor generator (M /
G) Until the unit 13 functions as a generator, the electric power of the main battery 15a is applied to the motor 7, and the electric power drives the front wheels 11 to immediately bring the vehicle into the four-wheel drive state. And the motor generator (M /
G) 13 starts to function as a generator, and then the electric power generated by the motor generator (M / G) 13
, The motor 7 drives the front wheels 11 by the electric power, and the vehicle enters a four-wheel drive state.

If it is determined in S1004 that the vehicle is starting, the ECU 16 predicts that four-wheel drive is required, and proceeds to S1008. In S1008,
The ECU 16 controls the second inverter (I2) 14 according to the auxiliary pattern A shown in FIG.
The electric power of 5 a is applied to the motor 7.

Subsequently, the ECU 16 proceeds to S1009, controls the first inverter (I1) 12, causes the motor generator (M / G) 13 to act as a generator, and the motor generator (M / G) 13 The generated power is applied to the motor 7.

In this case, the motor generator (M /
G) The electric power generated in 13 and the electric power of the main battery 15a are applied to the motor 7, and the electric power drives the front wheels 11 to put the vehicle in a four-wheel drive state. At this time, the electric power applied to the motor 7 is the electric power generated by the motor generator (M / G) 13 and the main battery 1.
Since the electric power is obtained by adding the electric power of 5a, the electric power required at the time of starting is sufficiently secured. When the power generation amount of the motor generator (M / G) 13 reaches a desired power generation amount, the power supply from the main battery 15a to the motor 7 is stopped.

When it is determined in step S1002 that the four-wheel drive switch is set to ON, or in step S1003, the state of charge of the main battery 15a (SO
If it is determined that C) is equal to or less than a predetermined value (α%), EC
U16 performs the same process as when it is determined in S1004 that the vehicle is starting.

In the embodiment described above, when four-wheel drive traveling is required, the motor / generator (M / G) 1
3 is operated as a generator, and the motor 7 is operated by the generated energy, so that the power consumption of the main battery 15a can be suppressed.

Further, the motor generator (M / G) 13 may have a shortage of power generation, for example, when the vehicle starts moving, or may be switched from two-wheel drive to four-wheel drive while the vehicle is running. When the power generation by the generator (M / G) 13 cannot be made in time or the like, the motor 7 is temporarily operated by using the electric power of the battery 15, so that the vehicle can be immediately put into the four-wheel drive state. The running stability can be improved while minimizing the power consumption of the vehicle.

Further, since the motor 7 is not operated when the four-wheel drive is not required, the drag of the motor 7 can be reduced and the fuel consumption rate of the engine 1 can be improved. Therefore, according to the present embodiment, in a four-wheel drive vehicle in which the wheels driven by the motor and the wheels driven by the engine are independent, the running stability of the vehicle is reduced while the power consumption of battery 15 is minimized. As a result, it is possible to achieve both running stability and battery downsizing.

[0075]

The vehicle drive control device according to the present invention comprises:
When it is necessary to drive the second wheel by the motor, the generator is operated and the energy generated by the generator is supplied to the motor to drive the second wheel, so that the consumption of battery power is suppressed.

In the drive control device of the present invention, when multi-wheel drive is not required, the wheels are not driven by the motor, so that the engine drag loss can be reduced and the fuel consumption rate can be improved.

Further, according to the drive control device of the present invention, when the power generated by the generator is insufficient to operate the motor when the wheels are driven by the motor, the electric energy stored in the battery is temporarily used. As a result, the electric power required for operating the motor can be secured immediately. That is, it is possible to improve running stability while minimizing battery power consumption.

Therefore, according to the present invention, the running stability can be improved while minimizing the consumption of the battery power, so that both the miniaturization of the battery and the improvement of the running stability can be achieved. Become.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an overall image of a device to which a drive control device according to the present invention is applied;

FIG. 2 is a schematic diagram showing a gear train of an automatic transmission (A / T).

FIG. 3 is a diagram showing an operation state of an automatic transmission (A / T).

FIG. 4 is a view showing a shift lever position.

FIG. 5 shows a steering wheel having a shift switch.

FIG. 6 is a diagram showing a power connection form of a motor generator (M / G).

FIG. 7 is a diagram showing input / output signals of an ECU.

FIG. 8 is a diagram showing a mode for selectively using battery power (1).

FIG. 9 is a diagram (2) showing a mode for selectively using battery power.

FIG. 10 is a flowchart illustrating a drive control routine.

[Explanation of symbols]

 1 ··· Engine (E / G) 2 ··· Automatic transmission (A / T) 6 ··· Rear wheel 7 ··· Motor 11 · Front wheel 12 ··· First inverter ( I1) 13 ... Motor generator (M / G) 14 ... Second inverter (I2) 15 ... Battery 15a ... Main battery 15b ... Sub battery 16 ... ECU 17 ... Crankshaft 18 electromagnetic clutch 20 electromagnetic clutch 21 reduction gear

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shuji Nagano 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation F-term (reference) 3D043 AA01 AA06 AB17 EA00 EA02 EA05 EB03 EB07 EE02 EE06 EE07 EF09 EF12 3G093 AA03 AA05 AA07 AA16 BA19 CB00 CB05 DA06 DB00 DB02 DB05 DB06 DB11 DB15 DB17 DB21 EB00 EC02 FA11 5H115 PA08 PA11 PA12 PI29 PO02 PU08 PU22 PU24 PU25 PU28 PU29 PV09 QE14 QN03 SE03 SE04 SE09 TB03 TE02 TE08 TI01 TO02 TO05 TO21 TO30

Claims (2)

[Claims] 1. An engine, a first wheel driven by the engine, a generator, a motor operated by energy generated by the generator, and a second wheel driven by the motor. A drive control device for a vehicle, a prediction unit that predicts whether or not the second wheel needs to be driven by the motor; and the prediction unit predicts that the second wheel must be driven by the motor. A drive control unit for driving the wheels by the motor by activating the generator. 2. An engine, a first wheel driven by the engine, a generator, a motor operated by energy generated by the generator, and a second wheel driven by the motor. A drive control device for a vehicle, wherein the motor is connected to a battery, and a motor drive control means for operating the generator to drive a second wheel by the motor, wherein the motor drive control means A drive control device for a vehicle, wherein the motor is operated by using the electric energy stored in the battery when the power generated by the motor is insufficient for the operation of the motor.