JP3132372B2 - Hybrid vehicle and hybrid vehicle control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hybrid vehicle having a drive system in which an engine and a generator are connected to an output shaft connected to an electric motor via a differential gear device, and more particularly to a hybrid vehicle. The present invention relates to a hybrid vehicle capable of controlling the number of rotations even if the motor is a motor.

[0002]

2. Description of the Related Art Hitherto, a hybrid vehicle having a drive device using both an engine and a motor has been provided in order to realize low pollution and low fuel consumption. Various types of hybrid vehicles of this kind are provided.For example, rotation generated by driving an engine is transmitted to a generator to drive the generator, and electric power obtained by the generator is transmitted to a battery. Or a series (serial) type hybrid vehicle in which the drive motor is driven by the electric power of the battery, or the vehicle is driven by transmitting the driving force of the engine and the drive motor to the output shaft to drive the vehicle. There is a parallel-type hybrid vehicle that controls the output of the vehicle to increase or decrease the speed.

In the above-mentioned parallel type hybrid vehicle, a hybrid vehicle having a structure in which an engine, a generator, and a drive output shaft are connected via a differential gear device and a drive motor is connected to the drive output shaft is proposed. (U.S. Pat. No. 3,566,717). The generator is driven by a part of the engine output, and the regenerative power is supplied to the battery.

[0004]

On the other hand, in a parallel type hybrid vehicle having the above differential gear device,
There are the following problems. The charging of the battery is covered by the power generated from the generator and the regenerative power from the drive motor during braking, but the battery has an allowable charge,
If the allowable charge amount of the battery is exceeded, the battery may be overcharged and may not be able to perform sufficient regenerative braking.

Further, when the control for stopping the engine to give priority to the regeneration by the electric motor is performed when the accelerator pedal is turned off or the vehicle is set to the braking state, a system having the above differential gear device is provided. In such vehicles, since the generator is connected to the output shaft via a differential gear device, the speed of the generator may exceed the maximum allowable speed during high-speed running, and the generator may become uncontrollable. There is.

Further, in a high-speed running state, it is necessary to increase the number of revolutions of the engine to some extent. In order to obtain a sufficient engine torque for the high-speed running, a maximum efficiency region (a) as shown in FIG. ), The engine must be driven in an area outside the range, and it is difficult to achieve low fuel consumption.

An object of the present invention is to provide a hybrid vehicle with improved engine driving efficiency and a method of controlling the hybrid vehicle.
Is to provide a law .

[0008]

This and other objects are achieved by the invention described below.

(1) An internal combustion engine, a generator, a first gear element connected to the generator, a second gear element connected to a drive output shaft, and a second gear element connected to the internal combustion engine. A differential gear device having three gear elements, an electric motor whose rotation is transmitted to the drive output shaft, an engine control device for controlling the output of the internal combustion engine, and a motor for controlling the current of the electric motor A control device, a generator control device for controlling the number of revolutions of the generator and driving the generator as a motor, and detecting a remaining battery level of the battery.
Charging capacity detection means for detecting the accelerator opening.
Xel opening detection means and vehicle speed detection means for detecting vehicle speed
And the battery remaining amount, the accelerator opening, and the vehicle speed.
Current engine based on at least one factor
Means for calculating engine acceleration / deceleration rotation speed with respect to rotation speed
When the engine acceleration / deceleration rotational speed is a negative value, the internal combustion engine is driven along a best fuel efficiency curve by driving the generator as a motor.
Hybrid vehicle, characterized in that that. (2) The engine acceleration / deceleration speed is determined by
The higher the battery level, the larger the setting.
(1) characterized by taking a negative value.
Hybrid vehicle. (3) The deceleration operation detecting means for detecting the brake depression amount
Equipped with the engine acceleration / deceleration rotation based on the brake depression amount
The method described in (1) or (2) above, wherein the number is obtained.
Onboard hybrid vehicle. (4) The differential gear device is a planetary gear unit.
And a first gear element connected to the generator is
And a second gear element coupled to the drive output shaft
Is a ring that meshes with a pinion that meshes with the sun gear
A third gear coupled to the internal combustion engine;
The element is a carrier that rotatably supports the pinion
(1), (2), or (3) above,
A hybrid vehicle according to claim 1. (5) On the first axis, the internal combustion engine and the
A planetary gear unit and the generator are disposed;
The electric motor is arranged on a second axis parallel to the first axis.
(4) characterized in that the
Brid vehicle. (6) An internal combustion engine, a generator, and connection with the generator
First gear element, and a second gear element connected to the drive output shaft.
Gear element and a third tooth connected to the internal combustion engine
A differential gear device having a vehicle element;
An electric motor to which rotation is transmitted and an output of the internal combustion engine
An engine control device for controlling the electric current of the electric motor
And a motor control device for controlling the rotation speed of the generator.
A generator for driving the generator as a motor
A control device and a current engine speed of the internal combustion engine
Means for calculating an engine acceleration / deceleration rotational speed with respect to
A generator brake for stopping the rotation of the generator, and the generator
Brake-on engine speed when the brake is engaged
And the engine speed command value from the engine speed increase / decrease speed.
Means for determining the engine speed,
In the case of a negative value, the generator is driven as a motor.
Driving the internal combustion engine in the best fuel economy area.
And the engine speed command value is
Lower than the engine speed that guarantees the idling speed of
In this case, the generator is idled.
Hybrid vehicle. (7) An internal combustion engine, a generator, and connection with the generator
First gear element, and a second gear element connected to the drive output shaft.
Gear element and a third tooth connected to the internal combustion engine
A differential gear device having a vehicle element;
An electric motor to which rotation is transmitted and an output of the internal combustion engine
An engine control device for controlling the electric current of the electric motor
And a motor control device for controlling the rotation speed of the generator.
A generator for driving the generator as a motor
A control device and a current engine speed of the internal combustion engine
Means for calculating an engine acceleration / deceleration rotational speed with respect to
A generator brake for stopping the rotation of the generator, and the generator
Brake-on engine speed when the brake is engaged
And the engine speed command value from the engine speed increase / decrease speed.
Means for determining the engine speed,
In the case of a negative value, the generator is driven as a motor.
Driving the internal combustion engine in the best fuel economy area.
And the engine speed command value is
Higher than the rotational speed that guarantees idling of the internal combustion engine.
When the engine speed is 0, the power generation
Hybrid vehicle characterized by engaging machine brake
Both. (8) The engine acceleration / deceleration speed is set to the maximum of the generator.
The feature is that it is limited to the range of the number of revolutions considering the output
According to any one of the above (1) to (7)
Hybrid vehicle. (9) When the hybrid vehicle is decelerating,
Generating regenerative electric power with an air motor
The hybrid according to any one of (1) to (8).
Vehicles. (10) The engine control device includes the internal combustion engine
The throttle opening of the internal combustion engine according to the rotational speed of the engine.
Control of the above (1) to (9)
A hybrid vehicle according to any one of the preceding claims. (11) a first gear element connected to the generator;
A second gear element connected to the output shaft and the internal combustion engine
A differential gearing having a third gear element coupled thereto;
And an electric motor whose rotation is transmitted to the drive output shaft.
A method for controlling a hybrid vehicle, comprising:
Based on at least one of accelerator opening and vehicle speed
The engine speed for the current engine speed
Calculating the number of rotations, and
In the case of a negative value, the generator is driven as a motor.
The internal combustion engine according to the best fuel economy curve.
Driving step
A method for controlling an hybrid vehicle. (12) Step for calculating the engine acceleration / deceleration speed
Calculates the engine acceleration / deceleration speed from the brake depression amount
The hybrid according to the above (11),
Vehicle control method.

[0010]

[0011]

[0012]

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a hybrid vehicle according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a conceptual diagram showing a drive device for a hybrid vehicle according to a first embodiment of the present invention. In the figure, the first
On the axis, an engine 11, an engine output shaft 12 for outputting rotation generated by driving the engine 11, and a differential gear device for shifting the rotation input through the engine output shaft 12 A planetary gear unit 13, a unit output shaft 14 to which the rotation of the planetary gear unit 13 after rotation is output, a first counter drive gear 15 fixed to the unit output shaft 14, and a generator mainly in a normal running state. And a transmission shaft 17 for connecting the generator 16 and the planetary gear unit 13 are arranged. The unit output shaft 14 has a sleeve shape and is disposed so as to surround the engine output shaft 12. Also, the first
The counter drive gear 15 is disposed closer to the engine 11 than the planetary gear unit 13.

The planetary gear unit 13 has a sun gear S as a first gear element, a pinion P meshing with the sun gear S, a ring gear R as a second gear element meshing with the pinion P, and a pinion P rotatable. And a carrier CR that is a third gear element that supports the first gear element. The sun gear S is connected to the generator 16 via the transmission shaft 17,
Ring gear R is connected to first counter drive gear 15 via unit output shaft 14, and carrier CR is connected to engine 11 via engine output shaft 12.

Further, the generator 16 is fixed to the transmission shaft 17 and is rotatably disposed.
And a coil 23 wound around the stator 22. The generator 16 is
Electric power is generated by the rotation transmitted via the transmission shaft 17. The coil 23 is connected to a battery 19 which is a power storage means shown in FIG.

The generator 16 has, on the other end side of the transmission shaft 17,
Generator brake 28 is connected, by the generator blur <br/> over key 28 and the engagement state, the rotor 21 is fixed, the rotation and the rotation of the sun gear S of the generator 16 is stopped It has become.

On a second axis parallel to the first axis, an electric motor 25, a motor output shaft 26 to which the rotation of the electric motor 25 is output, and a second counter drive gear 27 fixed to the motor output shaft 26. And are arranged.

The electric motor 25 includes a rotor 37 fixed to the motor output shaft 26 and rotatably disposed; a stator 38 disposed around the rotor 37;
8 and a coil 39 wound therearound. The electric motor 25 generates torque by a current supplied to the coil 39. Therefore, the coil 39 is connected to the battery 1
9 to be supplied with current from the battery 19. When the hybrid vehicle of the present invention is in the decelerating state, the electric motor 25 receives rotation from driving wheels (not shown) to generate regenerative power, and supplies the regenerative power to the battery 19 for charging.

In order to rotate a drive wheel (not shown) in the same direction as the rotation of the engine 11, a counter shaft 31 is arranged as a drive output shaft on a third axis parallel to the first axis and the second axis. Has been established. A counter driven gear 32 is fixed to the counter shaft 31. Further, the counter driven gear 32 and the first counter drive gear 15 and the counter driven gear 3
2 and the second counter drive gear 27 are engaged with each other,
The rotation of the first counter drive gear 15 and the rotation of the second counter drive gear 27 are inverted and transmitted to the counter driven gear 32.

Further, a differential pinion gear 33 having a smaller number of teeth than the counter driven gear 32 is fixed to the counter shaft 31. A differential ring gear 35 is provided on a fourth axis parallel to the first axis, the second axis, and the third axis, and the differential ring gear 35 and the differential pinion gear 33 are meshed. The differential ring gear 3
5, a differential device 36 is fixed, and the rotation transmitted to the differential ring gear 35 is made differential by the differential device 36 and transmitted to drive wheels.
In the above configuration, the drive output system includes the planetary gear unit 13, the generator 16, the first counter drive gear 15, the counter driven gear 32, the second counter drive gear 27, the counter shaft 31, the differential pinion gear 33, It comprises a differential ring gear 35 and a differential device 36.

As described above, not only can the rotation generated by the engine 11 be transmitted to the counter driven gear 32, but also the rotation generated by the electric motor 25 can be transmitted to the counter driven gear 32. The hybrid vehicle can be driven in an engine driving mode in which only the motor 11 is driven, a motor driving mode in which only the electric motor 25 is driven, and an engine / motor driving mode in which the engine 11 and the electric motor 25 are driven. Further, by controlling the electric power generated in the generator 16, the rotation speed of the transmission shaft 17 can be controlled. Further, the engine 11 can be started by the generator 16. Further, when stopping the rotation of the generator, the generator <br/> brake 28 it is possible to fix the rotor 21 of the engaging mating Now the generator 16.

Next, the control system of the hybrid vehicle according to the present invention will be described in detail with reference to the block diagram of FIG. The control system according to the present embodiment includes a vehicle control device 41, an engine control device 42, a motor control device 43, and a generator control device 44. These control devices 41, 4
Reference numerals 2, 43, and 44 denote CPUs (Central Processing Units), ROMs (Read-On-Memory) storing various programs and data, and RAs used as working areas.
It can be constituted by a microcomputer having M (random access memory) and the like. And
The engine speed control means is controlled by the vehicle control device 41 and the engine control device 42, and the generator control means is controlled by the vehicle control device 41, the generator control device 44, and the generator brake 28.
By the above, the on-engagement rotation speed calculating means becomes the vehicle control device 4
1 respectively.

Further, the control system includes an accelerator sensor 45 for detecting the accelerator opening α, a vehicle speed sensor 46 for detecting the vehicle speed V, a brake sensor 47 as deceleration operation detecting means for detecting the brake depression amount β. Bas of the battery 19
And a battery sensor 48 which is a charging capacity detecting means for detecting the remaining battery charge SOC. Each sensor 4
The detection values detected at 5, 46, 47, and 48 are supplied to the vehicle control device 41. The vehicle speed sensor 46 actually detects the rotation speed of the axle and supplies the detected rotation speed to the vehicle control device 41. The vehicle control device 41 calculates the vehicle speed V based on the rotation speed supplied from the vehicle speed sensor 46.

The vehicle control device 41 controls the entire hybrid vehicle. The vehicle control device 41 determines an accelerator opening α from an accelerator sensor 45 and a torque TM * according to a vehicle speed V from a vehicle speed sensor 46, and determines this. It is supplied to the motor control device 43.

The vehicle control unit 41 supplies an engine ON / OFF signal to the engine control unit 42. Specifically, for example, when the brake is depressed and the brake depression amount β is supplied from the brake sensor 47, an engine OFF signal for turning off the engine 11 is supplied, and when the brake is released, the engine 11 is turned off. Is supplied with an engine ON signal for driving the. The engine ON / OFF signal may be configured so that the signal is switched by ON / OFF of the accelerator.

The engine control device 42 includes a vehicle control device 4
1 based on the ON / OFF signal input from the engine 11 to the driving state (O
N) and a non-driving state (OFF state) in which no engine torque is generated, and controlling the throttle opening θ of the engine 11 according to the engine speed NE input from the engine speed sensor. Thus, the output of the engine 11 is controlled. Also,
The engine 11 is controlled by the engine control device 42 so that the engine 11 is always operated in the maximum efficiency region.

Further, the vehicle control device 41 turns on the solenoid to the electromagnetic valve 54 for operating the generator brake 28.
/ OFF signal. In the electromagnetic valve 54, a solenoid built in the electromagnetic valve 54 operates based on the supplied ON / OFF signal. For example, in the case of an ON signal, the solenoid operates to open the valve, and the solenoid valve 54 Pressurized oil is supplied to the generator brake 28 to bring the generator brake 28 into the engaged state.
The valve is closed to disengage the generator brake 28.

The generator control unit 44 controls the rotation speed NG of the generator 16 and controls the current (torque) IG so that the target rotation speed NG * supplied from the vehicle control unit 41 is obtained. The generator control device 44 can also drive the generator 16 as a motor by the current (torque) IG.

The motor control device 43 controls the current (torque) IM of the electric motor 25 so that the supplied torque TM * is output from the electric motor 25.

Next, the operation of the hybrid vehicle having the above configuration will be described. FIG. 3A is a conceptual diagram of the planetary gear unit 13 (FIG. 1) according to the first embodiment of the present invention, and FIG. 3B is a diagram showing the speed of the planetary gear unit 13 according to the first embodiment during normal running. FIG.

In this embodiment, as shown in FIG. 3A, the number of teeth of the ring gear R of the planetary gear unit 13 is twice the number of teeth of the sun gear S.
Therefore, the unit output shaft 14 connected to the ring gear R
(Hereinafter referred to as “ring gear rotation speed”)
The rotation speed of the engine output shaft 12 connected to the carrier CR (hereinafter, referred to as “engine rotation speed”) is NE, and the rotation speed of the transmission shaft 17 connected to the sun gear S (hereinafter, referred to as “generator rotation speed”). ), NR, N
The relationship between E and NG is as shown in FIG.

NG = 3 · NE−2 · NR.

During normal running of the hybrid vehicle, the ring gear R, the carrier CR and the sun gear S are all rotated in the forward direction, and as shown in FIG. Both the rotation speed NE and the generator rotation speed NG take positive values.

Next, the control operation of the vehicle control device 41 will be described in detail based on the flowcharts of FIGS. 4, 9, 10, and 12, and the maps of FIGS. 5, 6, 7, 8, and 11. I do. The accelerator opening α is input from the accelerator sensor 45 to the vehicle control device 41 (step S10).
1) The brake depression amount β is input from the brake sensor 47 (step S102), and the vehicle speed V is input from the vehicle speed sensor 46.
Is input (step S103), and the remaining battery charge SOC is input from the battery sensor 48 (step S103).
104).

The input accelerator opening α, vehicle speed V,
From the remaining battery charge SOC, the engine speed-up rotation speed ΔNei is calculated based on the maps shown in FIGS. 5 to 7 (step S105). This map is stored in the vehicle control device 41 in advance, and includes a map in a low-speed range where the vehicle speed is 30 km / h or less (FIG. 5), and a map of 30 to 60 km / h.
h map in the middle speed range (FIG. 6) and 60 km
/ H is a map in a high-speed range of not less than / h (FIG. 7).

In each map, the larger the accelerator opening α is,
The engine speed-up rotation speed ΔNei is set to be larger as the engine speed-up rotation speed ΔNei is larger and the battery remaining amount SOC is smaller. First, any one of the three maps is selected according to the vehicle speed V, and then the engine speed increase Nei on the vertical axis is determined from the accelerator opening α and the remaining battery charge SOC. In each map, the acceleration / deceleration is 500 r to save power.
The engine speed-up rotation speed ΔNei is determined in the range of not less than pm and not more than 1500 rpm.

Next, based on the map shown in FIG. 8, the engine deceleration speed .DELTA.
Is calculated (step S106). As shown in the flowchart of FIG. 9, the engine speed-up rotation speed ΔNei
From engine deceleration rotational speed DerutaNed, engine acceleration and deceleration times
Determine the number of turns ΔNe (ΔNe = ΔNei−ΔNed)
(Step S107).

It is determined whether or not the obtained value of the engine acceleration / deceleration rotation speed ΔNe is in the range of -500 to 500 rpm (step S108). If it is within this range, the value of the engine acceleration / deceleration rotation speed ΔNe is set to 0 (step S109). If not, the next step is performed.

When the value of the engine acceleration / deceleration speed ΔNe is 15
It is determined whether it is greater than 00 rpm (step S1).
10). If it is larger, the engine acceleration / deceleration speed ΔNe
Is set to 1500 (step S111). If so, perform the next step.

As shown in the flowchart of FIG. 10, when the value of the engine acceleration / deceleration speed ΔNe is -1500
It is determined whether it is smaller than rpm (step S11).
2). If smaller, the value of the engine acceleration / deceleration speed ΔNe is set to −1500 (step S113). If so, perform the next step. As described above, the value of the engine acceleration / deceleration rotation speed ΔNe is set to −1500 to 1500r.
The reason for limiting to the pm range is that the maximum output of the generator 16 is considered.

Based on the map shown in FIG. 11, the engine speed (brake-on engine speed) Ne when the generator brake 28 is engaged and the generator 16 is fixed.
b is obtained (step S114). The brake-on engine speed Neb is obtained by obtaining the engine speed on the vertical axis from the vehicle speed on the horizontal axis using the straight line c in the map of FIG. The required engine speed should be a minimum of 1000 to guarantee engine idling.
rpm.

Next, the brake-on engine speed Neb
Then, an engine speed command value Nec is obtained from the engine acceleration / deceleration speed ΔNe (Nec = Neb + ΔNe) (step S115). The rotational speed command value Nec is supplied from the vehicle control device 41 to the engine control device 42. FIG.
As shown in (1), it is determined whether or not the engine speed command value Nec is greater than 1000 rpm (step S116). If it is smaller, the generator 16 is idled (step S117) to guarantee idling of the engine 11.

If it is large, the engine acceleration / deceleration speed Δ
It is determined whether Ne is 0 (step S118),
If it is 0, an ON signal for engaging the generator brake 28 is output to the electromagnetic valve 54 (step S1).
19). The engagement of the brake 28 saves power energy for holding the generator in a stopped state.

If the engine acceleration / deceleration rotation speed ΔNe is not 0, a value three times the engine acceleration / deceleration rotation speed ΔNe is set as the generator rotation speed command value (step S120).
To output the command value. Here, when the engine acceleration / deceleration rotation speed ΔNe is a positive value, the generator 16 generates power. When the engine acceleration / deceleration rotation speed ΔNe is a negative value, the generator 16 is driven as a motor and discharges.

In the above control operation, in the maps (FIGS. 5 to 7) for determining the engine speed-up rotation speed ΔNei, the larger the remaining battery charge SOC, the larger the engine speed-up rotation speed ΔNe.
Since the value of i is set to be small, the value of the engine acceleration / deceleration speed ΔNe also becomes smaller as the remaining battery charge SOC increases . As a result, if the engine acceleration / deceleration speed ΔNe becomes a negative value, the generator 16 And is controlled to consume the charge amount. Therefore, when the brake is depressed, regenerative braking can be performed efficiently.

The same applies to the case of a high vehicle speed. As shown in FIG. 7, as the remaining amount of the battery becomes larger, the engine speed-up rotation ΔNei becomes a negative value, and as a result, the engine speed increases or decreases. The speed rotation speed ΔNe becomes a negative value,
The generator 16 is driven as a motor. Referring to the engine best fuel consumption curve diagram of FIG. 13, a line a in the figure is a best fuel consumption curve, and a line b is an equal fuel consumption rate curve. The engine 11 controls the best fuel economy curve by the engine control device 42.
In particular, during normal driving, the vehicle is controlled to be driven within the region (a) with the highest fuel efficiency in the equal fuel consumption rate curve.

When the vehicle speed becomes high, it is necessary to increase the engine speed. In the present invention, however, by driving the generator as a motor as described above, the generator can bear the increased speed. Thus, it is possible to drive the engine 11 in the best fuel consumption area (a).

It is to be noted that the regeneration efficiency is improved and the driving of the engine is improved.
The purpose is to provide a hybrid vehicle with improved efficiency
The following may be performed. (A) an internal combustion engine;
A generator capable of controlling the number of revolutions, and a second generator connected to the generator.
A first gear element and a second gear element coupled to the output shaft
And a third gear element connected to the internal combustion engine.
Provided with a differential gear device, and integrally rotating with the output shaft
The number of rotations of the electric motor and the internal combustion engine is predetermined.
An engine speed control means for controlling the engine speed within a predetermined range;
According to the engine speed controlled by the engine speed control means
Generator control means for controlling the number of revolutions of the generator
It is good also as a hybrid vehicle characterized by the above. This
This allows the engine speed to be driven in the optimal efficiency range.
To control the generator's rotational speed.
High fuel consumption because it can be compensated for by
The efficiency can be maintained and the generator can be
, Arbitrarily reduce the amount of power stored in the power storage means
Control the amount of electricity stored in the electricity storage means to a desired amount
It is possible to do.

(B) The engine speed control means
Is the minimum of battery remaining, accelerator opening, and vehicle speed.
Control engine speed based on one factor
The hybrid vehicle described in (A) may be used. to this
From the battery level, accelerator opening, and vehicle speed.
By controlling the engine speed,
Engine speed control and generator control become possible,
An efficient hybrid vehicle can be provided.

(C) The generator control means includes:
Including a brake to stop the generator from rotating (A) or
The hybrid vehicle described in (B) may be used. to this
A brake to stop the generator from rotating
To turn off the power for controlling the generator rotation to 0.
No need to spend and power efficiency can be further improved
it can.

(D) The engine speed control means
Indicates the engine speed when the brake is applied from the vehicle speed.
(C) including the on-engagement rotational speed calculating means for calculating
It may be a bridging vehicle. This allows the brake to be engaged.
By calculating the engine speed at the time of
According to the engine speed controlled by the engine speed control means
The control of the generator rotation speed performed easily is facilitated.

[0052]

As described above, according to the present invention, the remaining battery, the accelerator opening, and the vehicle speed are reduced.
To the current engine speed based on one factor
Calculate the engine acceleration / deceleration speed
When the number of turns is a negative value, the internal combustion engine is driven to a best fuel consumption curve by driving the generator as a motor.
Since the driving is performed along the driving direction, the driving efficiency of the engine can be improved.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a drive device for a hybrid vehicle according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a control system according to the embodiment of the present invention.

FIG. 3 is a conceptual diagram and a velocity diagram of the planetary gear unit of the embodiment.

FIG. 4 is a flowchart showing a control operation of the vehicle control device.

FIG. 5 is a map for determining one engine speed-up rotation speed.

FIG. 6 is a map for determining an engine speed-up rotation speed.

FIG. 7 is a map for determining an engine speed-up rotation speed.

FIG. 8 is a map for determining an engine deceleration speed.

FIG. 9 is a flowchart showing a control operation of the vehicle control device.

FIG. 10 is a flowchart showing a control operation of the vehicle control device.
It is.

FIG. 11 is a map for determining a brake-on engine speed.

FIG. 12 is a flowchart showing a control operation of the vehicle control device.
It is.

FIG. 13 is a best fuel economy curve diagram of the engine.

[Explanation of symbols]

 Reference Signs List 11 engine 13 planetary gear unit 15 first counter drive gear 16 generator 18 rotor shaft 19 battery 25 electric motor 28 generator brake 41 vehicle control unit 42 engine control unit 43 motor control unit 44 generator control unit 45 accelerator sensor 46 vehicle speed sensor 47 Brake sensor 54 Solenoid valve

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-7-135701 (JP, A) JP-A-48-49115 (JP, A) JP-A-4-322105 (JP, A) JP-A-7-135 123509 (JP, A) JP-A-6-319206 (JP, A) JP-A-48-49115 (JP, A) JP-A-6-38306 (JP, A) JP-A-9-68052 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) B60L 11/14 B60K 6/02 B60K 17/04 F02D 29 / 02,29 / 06

Claims (12)

(57) [Claims] An internal combustion engine, a generator, a first gear element connected to the generator, a second gear element connected to a drive output shaft, and a third gear element connected to the internal combustion engine. A differential gear device including: a gear element; an electric motor whose rotation is transmitted to the drive output shaft; an engine control device that controls an output of the internal combustion engine; and a motor control that controls a current of the electric motor. Device, a generator control device that controls the number of revolutions of the generator, and drives the generator as a motor, and a charging capacity detection unit that detects the remaining battery level of the battery
When the accelerator opening detection means for detecting an accelerator opening, vehicle speed detecting means for detecting a vehicle speed, the battery remaining amount, the accelerator opening, among the vehicle speed
Current engine speed based on at least one factor
Means for calculating the engine acceleration / deceleration rotation speed with respect to the engine speed, and when the engine acceleration / deceleration rotation speed has a negative value, the internal combustion engine is driven along the best fuel economy curve by driving the generator as a motor. hybrid vehicle according to claim and this <br/> driving Te. 2. The engine acceleration / deceleration speed is set to be larger as the accelerator opening is larger , and the remaining battery power is increased.
The hybrid vehicle according to claim 1, wherein the hybrid vehicle takes a negative value . 3. The hybrid vehicle according to claim 1, further comprising deceleration operation detecting means for detecting a brake depression amount, wherein the engine acceleration / deceleration rotational speed is obtained from the brake depression amount. 4. The planetary gear unit according to claim 1, wherein the differential gear unit is a planetary gear unit.
And the first gear element connected to the generator is a sun gear.
Ri, second gear element connected to the drive output shaft, said support
Ring gear der to pinion on and engaged to Ngiya meshing
A third gear element connected to the internal combustion engine,
It is a carrier that rotatably supports the pinion.
C according to claim 1, claim 2, or claim 3
Hybrid vehicle. 5. On a first axis, the internal combustion engine is:
The planetary gear unit and the generator are provided.
Is the On first axis parallel to the second axis, the electric motor
5. The device according to claim 4, wherein
Hybrid vehicle. 6. An internal combustion engine, a generator, a first gear element connected to the generator, a second gear element connected to a drive output shaft, and a third gear element connected to the internal combustion engine. A differential gear device including: a gear element; an electric motor whose rotation is transmitted to the drive output shaft; an engine control device that controls an output of the internal combustion engine; and a motor control that controls a current of the electric motor. A generator control device for controlling the speed of the generator and driving the generator as a motor; and an engine for the current engine speed of the internal combustion engine.
Means for calculating a gin acceleration / deceleration rotation speed, a generator brake for stopping the rotation of the generator, and an engine rotation speed based on a brake-on engine rotation speed when the generator brake is engaged and the engine acceleration / deceleration rotation speed. and means asking you to command value, and when the engine speed increasing and reducing the rotational speed is a negative value, it is driven in the best fuel economy region the internal combustion engine by driving the generator as a motor, the engine rotation A hybrid vehicle, wherein the generator is idled when a number command value is smaller than an engine speed that guarantees an idling speed of the internal combustion engine. 7. An internal combustion engine, a generator, a first gear element connected to the generator, a second gear element connected to a drive output shaft, and a third gear element connected to the internal combustion engine. A differential gear device including: a gear element; an electric motor whose rotation is transmitted to the drive output shaft; an engine control device that controls an output of the internal combustion engine; and a motor control that controls a current of the electric motor. A generator control device for controlling the speed of the generator and driving the generator as a motor; and an engine for the current engine speed of the internal combustion engine.
Means for calculating a gin acceleration / deceleration rotation speed, a generator brake for stopping the rotation of the generator, and an engine rotation speed based on a brake-on engine rotation speed when the generator brake is engaged and the engine acceleration / deceleration rotation speed. and means for determining the command value, and when the engine speed increasing and reducing the rotational speed is a negative value, is driven in the best fuel economy region the internal combustion engine by driving the generator as a motor, the engine speed A hybrid vehicle wherein the generator brake is engaged when a command value is larger than a rotation speed that guarantees idling of the internal combustion engine and the engine acceleration / deceleration rotation speed of the internal combustion engine is 0. 8. any one of claims of claims 7 claim 1, characterized in that to limit the engine acceleration and deceleration rotational speed in the range rotation speed of considering the maximum output of the generator A hybrid vehicle according to claim 1. 9. When the hybrid vehicle is in a deceleration state,
The hybrid vehicle according to any one of claims 1 to 8 , wherein regenerative electric power is generated by the electric motor. Wherein said engine control device according to claim claim 1, wherein the controlling the throttle opening of the internal combustion engine in accordance with the rotational speed of the internal combustion engine 9
The hybrid vehicle according to claim 1. 11. A differential gearing having a first gear element connected to a generator, a second gear element connected to a drive output shaft, and a third gear element connected to an internal combustion engine. And a control method for a hybrid vehicle comprising: an electric motor whose rotation is transmitted to the drive output shaft, wherein at least one of battery remaining amount, accelerator opening degree, and vehicle speed is selected.
Of the current engine speed based on
Calculating the engine acceleration / deceleration speed ; and, when the engine acceleration / deceleration speed is a negative value, driving the internal combustion engine along a best fuel consumption curve by driving the generator as a motor. A method for controlling a hybrid vehicle, comprising: 12. The hybrid vehicle control method according to claim 11 , wherein the step of calculating the engine acceleration / deceleration speed comprises calculating the engine acceleration / deceleration speed from a brake depression amount.