JPH1084636A - Controller of series hybrid electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce change of the number of rotations of an engine for output change of a generator and also surely prevent over charging by independently controlling the output of the power generator. SOLUTION: A controller of this series hybrid electric vehicle calculates the chargeable maximum power of a battery with the maximum chargeable power calculating section 21, also calculates the maximum output value allowed to the generator with the maximum power generation calculating section 23 and also calculates the maximum number of rotations allowed to the internal combustion engine with the internal combustion engine maximum number of rotation calculating section 24. A generator output controller 26 controls power generation of the generator to the value lower than the allowable maximum output value and also controls the number of rotations of the internal combustion engine so that the internal combustion engine controller 29 is in the restricted maximum number of rotations or less. Thereby, the maximum power generation output of generator is restricted depending on the condition of battery, the maximum number of rotations of engine is also restricted depending on the battery condition to surely prevent over charging of battery due to excessive increase of generation output of generator side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a series hybrid electric vehicle in which an output of an internal combustion engine is converted into electric power by a generator, and a driving motor is driven by this electric power and electric power from a battery to drive the vehicle. .

[0002]

2. Description of the Related Art Conventionally, a control device for a series hybrid electric vehicle disclosed in Japanese Patent Application Laid-Open No. 3-169203 is known. In the case of this conventional example, the output voltage of the generator is proportional to the rotation speed of the internal combustion engine, and the charging voltage from the generator to the battery is adjusted by adjusting the rotation speed of the internal combustion engine.

[0003]

However, in such a conventional control device for a series hybrid electric vehicle, the charging voltage of the battery is adjusted by adjusting the rotation speed of the internal combustion engine. When the battery voltage fluctuates due to an increase or decrease in the output, the rotational speed of the internal combustion engine frequently fluctuates accordingly.

[0004] In order to solve such problems,
A series hybrid electric system in which the generator is provided with a converter that controls the power output, and the output can be variably adjusted independently of the internal combustion engine speed, making the internal combustion engine speed less affected by battery voltage fluctuations Automotive control devices have been proposed.

[0005] In the proposed control device for an electric vehicle, a microcomputer is used for controlling the converter to calculate a drive signal of a power transistor element in the converter and perform switching control. The rotation speed of the internal combustion engine does not fluctuate frequently and stabilizes.However, there is a possibility that a malfunction may occur due to the incorporation of noise, which is a general problem of microcomputer control. Since the amount command value may be automatically calculated, it is necessary to incorporate a double safety measure to prevent overcharging.

The present invention has been made to solve such a conventional technical problem. In a control device for a series hybrid electric vehicle configured to control the power generation output of a generator by controlling a converter, the present invention is directed to a control device for a battery. An object of the present invention is to provide a control device for a series hybrid electric vehicle that can reliably prevent charging.

[0007]

According to a first aspect of the present invention, there is provided a control apparatus for a series hybrid electric vehicle, comprising: an internal combustion engine;
A generator driven by the internal combustion engine, a battery charged by the generator, a drive motor driven by the battery, battery state monitoring means for detecting the state of the battery, and the battery state monitoring means Maximum chargeable power calculation means for calculating the maximum chargeable power of the battery based on the state of the battery to be detected; and the power generation based on the maximum chargeable power of the battery calculated by the maximum chargeable power calculation means. A generator allowable maximum output calculating means for calculating a maximum output value allowed for the machine, and a power generation amount of the generator set to a maximum output value allowable for the generator calculated by the generator allowable maximum output calculating means. Controlling the generator output control means, and regulating the generator output control means according to the maximum output value allowed by the generator calculated by the generator maximum output calculation means. Means for calculating a maximum rotation speed of the internal combustion engine, wherein the maximum rotation speed of the internal combustion engine is calculated by the maximum rotation speed of the internal combustion engine calculated by the maximum rotation speed calculation device for controlling the internal combustion engine. And internal combustion engine control means for controlling the number.

In the control device for a series hybrid electric vehicle according to the present invention, the maximum chargeable power calculating means calculates the maximum chargeable power of the battery based on the state of the battery detected by the battery state monitoring means. ,
The generator allowable maximum output calculation means calculates a maximum output value allowed for the generator based on the maximum chargeable power of the battery calculated by the maximum chargeable power calculation means. The maximum rotational speed allowed for the internal combustion engine is calculated according to the maximum output value allowed for the generator calculated by the generator maximum output calculating means.

The generator output control means controls the amount of power generated by the generator to be equal to or less than the maximum output value calculated by the generator allowable maximum output calculation means. At the same time, the internal combustion engine control means controls the internal combustion engine regulated maximum rotational speed calculation means. Is controlled to be equal to or less than the maximum rotation speed of the internal combustion engine calculated by

In this way, the maximum power output of the generator is limited according to the state of the battery, and the maximum speed of the internal combustion engine is also controlled according to the state of the battery. The internal combustion engine limits the number of revolutions so that the power generation output of the generator does not excessively increase, thereby preventing battery overcharge.

A control device for a series hybrid electric vehicle according to a second aspect of the present invention includes an internal combustion engine, a throttle valve for controlling a flow rate of an air-fuel mixture supplied to the internal combustion engine,
A generator driven by the internal combustion engine, a battery charged by the generator, a drive motor driven by the battery, battery state monitoring means for detecting the state of the battery, and the battery state monitoring means Maximum chargeable power calculation means for calculating the maximum chargeable power of the battery based on the state of the battery to be detected; and the power generation based on the maximum chargeable power of the battery calculated by the maximum chargeable power calculation means. A generator allowable maximum output calculating means for calculating a maximum output value allowed for the machine, and a power generation amount of the generator set to a maximum output value allowable for the generator calculated by the generator allowable maximum output calculating means. A generator output control means for controlling the generator and a maximum output value allowed by the generator calculated by the generator allowable maximum output calculation means. And a maximum allowable throttle opening of the internal combustion engine according to the maximum output value of the internal combustion engine calculated by the internal combustion engine restriction maximum output calculation means. And a throttle opening restriction means for restricting the throttle valve from opening beyond the maximum allowable throttle opening of the internal combustion engine.

In the control device for a series hybrid electric vehicle according to the second aspect of the invention, the maximum chargeable power calculating means calculates the maximum chargeable power of the battery based on the state of the battery detected by the battery state monitoring means. ,
The generator allowable maximum output calculation means calculates a maximum output value allowed for the generator based on the maximum chargeable power of the battery calculated by the maximum chargeable power calculation means, and further the internal combustion engine regulated maximum output calculation means The maximum output value allowed for the internal combustion engine is calculated according to the maximum output value allowed for the generator calculated by the engine allowable maximum output calculating means, and the allowable maximum throttle opening degree calculating means is used for the internal combustion engine regulated maximum output calculating means. The maximum allowable throttle opening of the internal combustion engine is calculated according to the calculated maximum output value of the internal combustion engine.

The generator output control means controls the amount of power generated by the generator to be equal to or less than the maximum output value calculated by the generator allowable maximum output calculation means, and the throttle opening restriction means controls the maximum allowable throttle of the internal combustion engine. Restrict the throttle valve from opening beyond the opening.

In this way, the maximum power output of the generator is limited in accordance with the state of the battery, and the throttle valve of the internal combustion engine is restricted from opening beyond the maximum allowable throttle opening in accordance with the state of the battery. Even if one generator side malfunctions, the internal combustion engine side limits the number of revolutions so that the power generation output on the generator side does not increase excessively,
Prevent battery overcharge.

According to a third aspect of the present invention, in the control device for a series hybrid electric vehicle according to the first or second aspect, the maximum chargeable power calculating means is based on a voltage, a temperature and a remaining capacity detected by the battery state monitoring means. To calculate the maximum power that can be charged by the battery.

According to a fourth aspect of the present invention, in the control apparatus for a series hybrid electric vehicle according to any one of the first to third aspects, the generator allowable maximum output calculating means calculates the maximum chargeable power calculated by the maximum chargeable power calculating means. And calculating the maximum output value allowed for the generator based on the maximum power that can be charged and the average value of the power consumed by the drive motor.

According to a fifth aspect of the present invention, in the control apparatus for a series hybrid electric vehicle according to the fourth aspect, the maximum output value Pglim allowed for the generator, the maximum power Pblim that can be charged by the battery, and the drive motor = Pblim + k · Pmtav between the average power consumption Pmtav
Where the coefficient k is set to k = 1 when the maximum chargeable power Pbmax of the battery is larger than the maximum output value Pgmax allowed for the generator,
If not, k = 0 is set.

In the control device for a series hybrid electric vehicle according to the fourth and fifth aspects of the present invention, the power consumption of the drive motor can be replenished while controlling the battery so as not to be overcharged.

According to a sixth aspect of the present invention, in the control device for a series hybrid electric vehicle according to the first, third, fourth or fifth aspect, the internal combustion engine control means calculates the internal combustion engine regulated maximum rotational speed calculation means. The time change rate of the maximum engine speed is compared with a predetermined value, and when the change is larger than the predetermined value, the maximum engine speed is regulated to a predetermined value or less.

In the control device for a series hybrid electric vehicle according to the present invention, the time change rate of the maximum rotation speed of the internal combustion engine is monitored, and when the change rate exceeds a predetermined value, the change rate is regulated to thereby control the sound of the internal combustion engine. To prevent from suddenly becoming extremely large.

[0021]

According to the first and third aspects of the present invention,
The maximum power output of the generator is limited according to the state of the battery, and the maximum speed of the internal combustion engine is also limited according to the state of the battery. The number of rotations is limited so that the power generation output on the generator side does not increase excessively, and battery overcharge can be prevented.

According to the second and third aspects of the present invention, the maximum power output of the generator is limited according to the state of the battery, and the throttle valve of the internal combustion engine is equal to or larger than the maximum allowable throttle opening in accordance with the state of the battery. The internal combustion engine limits the number of revolutions so that the power output of the generator does not excessively increase even if there is a malfunction on the generator side. Charging can be prevented.

According to the fourth and fifth aspects of the present invention, it is possible to replenish the power consumption of the drive motor while controlling the battery not to be overcharged.

According to the sixth aspect of the present invention, the time change rate of the maximum rotation speed of the internal combustion engine is monitored, and when the change rate exceeds a predetermined value, the change rate is regulated, so that the sound of the internal combustion engine suddenly becomes extremely loud. Can be prevented.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a hardware configuration of a control device for a series hybrid electric vehicle according to a first embodiment of the present invention. The control device for the series hybrid electric vehicle includes an internal combustion engine (ENG) 1 and an intake pipe 2.
Is connected to the intake pipe 2 and the throttle body 3
Is provided. An actuator 4 is attached to the throttle body 3. The amount of air taken into the internal combustion engine 1 is adjusted by adjusting the opening of the throttle valve 5 in the throttle body 3 by the actuator 4. Is controlled.

A generator (GE) 6 is provided on the output shaft of the internal combustion engine 1.
Are connected so as to transmit the driving torque, and the rotation of the internal combustion engine 1 rotates the generator 6 to generate three-phase AC power. A converter (CONV) 7 is provided on the output side of the generator 6, and converts the output generated by the generator 6 from AC to DC.

The battery 8 is connected to the DC output side of the converter 7.
And an inverter 9 are connected in parallel. The output of the converter 7 is charged to a battery (Batt) 8 and supplied to an inverter (INV) 9. The AC output side of the inverter 9 is connected to a drive motor (MTR) 10, and converts DC power supplied from the converter 7 or supplied from the battery 8 into an AC having a predetermined voltage and a predetermined frequency to convert the DC power to the drive motor 10. Supply.

The battery 8 is provided with a battery state detector 11 for detecting its voltage, temperature and remaining capacity.
A control unit (C / U) 12 composed of a microcomputer is provided for monitoring the state of the battery 8 and controlling the operation of the internal combustion engine 1, the actuator 4, the converter 7, and the inverter 9.

FIG. 2 shows a functional configuration of the control calculation process executed by the control unit 12. As shown in FIG. The battery voltage, temperature,
A battery (Batt) maximum chargeable power calculation unit 21 that calculates the maximum power that can charge the battery 8 by inputting the remaining capacity (SOC), and an average that calculates the average power consumption based on the input voltage and current to the inverter 9 A power consumption calculator 22 and a battery maximum chargeable power calculator 21
Battery maximum chargeable power and average power consumption calculator 22
A maximum power generation amount calculating section 23 for calculating a maximum allowable power generation amount Pglim of the generator 6 based on the average power consumption of the generator 6 and a rotation speed Nli of the internal combustion engine 1 corresponding to the maximum allowable power generation amount Pglim.
internal combustion engine (ENG) maximum rotational speed calculation unit 24 for calculating m
And

The output command value of the generator 8 (power generation command P
*) Is set to a fixed value or variably set according to vehicle speed, average power consumption, remaining battery capacity, etc., the maximum power generation amount Pglim and the power generation amount calculated by the maximum power generation operation unit 23. Any smaller value min (P *) of the power generation amount command value P * output from the command value setting unit 25
, Pglim) and a generator output control unit 26 for controlling the output of the generator 6 based on the battery voltage and the battery temperature.

Further, the engine speed command value N * of the internal combustion engine 1 is set to a certain fixed value or variably set according to the vehicle speed, average power consumption, remaining battery capacity, etc.
G) The rotation speed command value setting unit 27, the maximum rotation speed Nlim calculated by the internal combustion engine maximum rotation speed calculation unit 24, or the rotation speed command value N * given by the internal combustion engine rotation speed command value setting unit 27, whichever is smaller. min (N *, Nlim) based on a rate-of-change limiting unit 28 for limiting the rate of change over time, a rotational speed command value output through the rate-of-change control unit 28, and battery voltage and battery temperature. And an internal combustion engine (ENG) rotation speed limiting unit 29 for controlling the rotation speed of the internal combustion engine 1.

Next, the operation of the control device for a series hybrid electric vehicle having the above configuration will be described. The maximum battery chargeable power calculator 21 calculates the maximum power Pblim that can charge the battery 8 based on the voltage, the temperature, and the state of charge (SOC) of the battery 8 given from the battery state detector 11. This formula is disclosed in Japanese Patent Application No. 7-239.
No. 628 is used.

The average power consumption calculator 22 calculates an average value Pmtav of power consumed by the drive motor 10 during a certain period.
Is calculated. In this calculation, the voltage and the current input to the inverter 9 are monitored, the input power is calculated from the product thereof, and the time is averaged.

The maximum power generation amount calculation unit 23 receives the maximum chargeable power Pblim of the battery 8 from the battery maximum chargeable power calculation unit 21, the average power consumption Pmtav from the average power consumption calculation unit 22, and The upper limit value Pglim of the power generation output of No. 6 is calculated. The upper limit value of the power output of the generator 6 is, for example, a limit value that means that if the battery 8 is charged with an amount of power generation greater than that, there is a risk of overcharging or overvoltage. Is calculated by

Pglim = Pblim + k · Pmtav Here, k is a coefficient for correcting the difference between the average power consumption and the actual instantaneous power consumption, and can be set to a constant value, as shown in FIG. It can be variably set according to the maximum chargeable power of the battery. FIG.
In the case of the variable setting shown in FIG.
If blim is large and larger than the maximum output of the generator 6, k = 1 and the average power consumption Pmtav is set as it is, and if the battery maximum chargeable power Pblim is small, k = 0. Thus, even if the average power consumption becomes larger than the actual instantaneous power consumption value, the maximum power generation amount does not exceed the battery maximum chargeable power.

Incidentally, assuming that k = 0, no term of the average power consumption is added, and the allowable maximum power generation amount Pglim = the maximum chargeable power of the battery Pbl
You can also set im.

The maximum number of revolutions of the internal combustion engine 24 is calculated with respect to the maximum allowable power generation amount Pglim output from the maximum power generation amount calculation unit 23. , The maximum number of revolutions of the generator 6 proportional to the number of revolutions of the internal combustion engine 1) Nlim. The maximum rotation speed Nlim is determined with respect to the output characteristics of the internal combustion engine 1, the output characteristics of the generator 6, the induced voltage characteristics, and the like. The internal combustion engine 1 has a maximum value that can be output for each rotation speed, and the generator 6 also has an induced voltage determined according to the drive rotation speed, and the maximum value of the power generation amount for each rotation speed in consideration of the current capacity. Exists. In general, the maximum output value of the internal combustion engine 1 and the generator 6 has a characteristic that increases as the rotational speed increases. Therefore, when it is desired to set a certain upper limit value for the output, the output is suppressed by limiting the rotational speed. Can be. FIG. 4 shows an example of the relationship between the rotation speed of the internal combustion engine 1 and the maximum power generation amount. However, it is possible to determine the maximum rotation speed of the internal combustion engine 1 according to the maximum power generation amount required in FIG. it can.

It is conceivable that the maximum internal combustion engine speed is limited by the induced voltage. That is, when the drive signal is not transmitted to the power transistor element due to disconnection or some other cause and the operation of the power element stops, the output voltage may be proportional to the rotation speed in a so-called full-wave rectifier operation. By setting the maximum number of revolutions of the internal combustion engine 1 based on the maximum voltage value that can be applied to the internal combustion engine 8, the induced voltage of the generator 6 is determined accordingly, and the converter 7 operates in the full-wave rectifier operation. The output voltage can be prevented from becoming an overvoltage for the battery 8.

The power generation command value setting section 25 outputs a preset output command value (power generation command P *).
This power generation amount command value P * can also be variably set based on vehicle speed, average power consumption, remaining battery capacity, and the like.

The generator output control unit 26 inputs the smaller value min (P *, Pglim) of the output Pglim of the maximum power generation amount calculation unit 23 or the power generation amount command value P *, and
The power generation output is controlled by determining the drive signal of the power element. That is, the current of the generator 6, the position of the rotor, and the number of rotations are detected, and the power generation amount command value min (P *,
Pglim) is converted into a command value of the current flowing through the generator 6, and the drive signal of the power element is determined such that the detected actual output current value matches the current command value.

The operation of the generator output control unit 26 to determine the power element drive signal in the converter 7 is the same as the operation of the power element drive signal in the inverter 9 that drives the drive motor 10. If the torque command value in the motor control is a positive value, the motor operation is performed, and if the torque command value is a negative value, the generator operation is performed.
An operation of converting kinetic energy given to a motor (generator) into electric power can be performed. As such a motor control method, the one proposed in “1993 National Conference of the Institute of Electrical Engineers of Japan, Collection of Lecture Papers [6], Section S10.-3” is used.

The internal combustion engine speed command value setting section 27 outputs a preset speed command value N *. The rotational speed command value N * can be variably set based on vehicle speed, average power consumption, remaining battery capacity, and the like.

At the same time, the internal combustion engine speed command value setting section 27 outputs a preset speed command value N *. The rotational speed command value N * can be variably set based on vehicle speed, average power consumption, remaining battery capacity, and the like.

The internal-combustion-engine rotational speed control unit 29 outputs the internal-combustion-engine maximum rotational speed Nlim output from the internal-combustion-engine maximum rotational speed calculation unit 24 and the internal combustion engine (ENG) rotational speed command from the internal combustion engine rotational speed command value setting unit 27. The smaller value min (N *, Nlim) of the value N * is input through the rate-of-change limiting unit 28, and the throttle valve is adjusted so that the speed of the internal combustion engine 1 matches the input speed command value. By driving the actuator 4, the amount of intake air to the internal combustion engine 1 is changed by a required amount to control the rotation speed of the internal combustion engine 1.

At this time, the rate-of-change limiting unit 28 sets min (N *
, Nlim) is provided with an upper limit for the time rate of change of the rotation speed command value to prevent the rotation speed of the internal combustion engine 1 from greatly changing in a short time.

As described above, the control device for the series hybrid electric vehicle according to the first embodiment calculates the maximum chargeable power Pblim based on the state of the battery 8, and calculates the maximum chargeable power of the battery 8. Calculating a maximum output value Pglim allowed for the generator 6 based on Pblim,
Further, the maximum rotational speed Nlim allowed for the internal combustion engine 1 is calculated in accordance with the maximum output value Pglim allowed for the generator 6, and the amount of power generated by the generator 6 is controlled to be equal to or less than the maximum output value Pglim. 1 by controlling the rotation speed of the internal combustion engine 1 to be equal to or lower than the maximum rotation speed Nlim of the internal combustion engine 1 in accordance with the state of the battery 8. By limiting the maximum rotation speed Nlim, the internal combustion engine limits the rotation speed so that the power generation output on the generator side does not excessively increase even if the generator side malfunctions, and the It prevents charging.

Next, a second embodiment of the present invention will be described with reference to FIGS. As shown in the functional block diagram of FIG. 5, the control device of the series hybrid electric vehicle according to the second embodiment has an allowable maximum power generation amount Pglim of the generator 6 corresponding to the maximum power Pblim that can be charged by the battery 8. An internal combustion engine (ENG) maximum output calculation unit 30 for calculating the maximum output allowed for the internal combustion engine 1 and a throttle opening for calculating the throttle opening corresponding to Weng output from the internal combustion engine maximum output calculation unit 30 Arithmetic unit 3
1 and a throttle opening restricting section 32 for restricting the actuator 4 so that the throttle valve 5 is adjusted to the throttle opening calculated by the throttle opening calculating section 31. For other parts, see FIG.
Therefore, the same reference numerals are given to the same parts, and the detailed description thereof will be omitted.

That is, similarly to the first embodiment, the maximum power generation amount calculation unit 23 generates power with respect to the maximum chargeable power Pblim of the battery 8 calculated by the battery (Batt) maximum chargeable power calculation unit 21. The maximum power generation Pglim allowed for the generator 6 is calculated, and the maximum power generation P
glim is supplied to the generator output control unit 26 and to the internal combustion engine maximum output calculation unit 30.

The internal-combustion-period maximum output calculating section 30 calculates the generator input, that is, the internal combustion engine output Pelim, by dividing the input / output efficiency of the generator 6 by the given maximum power generation amount Pglim. In general, since the input / output efficiency of the generator 6 is 70 to 90%, it is not necessary to divide the input / output efficiency particularly in the case of the generator 6 having a high efficiency. The calculation unit 30 is omitted, and the output of the maximum power generation amount calculation unit 23 is directly input to the throttle opening calculation unit 3.
1 may be provided.

The throttle opening calculator 31 calculates the throttle opening corresponding to the maximum output Pelim of the internal combustion engine. The throttle opening restriction unit 32 restricts the opening of the throttle valve 4 with the throttle opening calculated by the throttle opening calculation unit 31 as an upper limit.

The output value generated by the internal combustion engine 1 and the throttle opening cannot always be uniquely associated with each other, and are affected by the rotational speed of the internal combustion engine 1, the fuel injection state, and the like. However, the intake air amount can be limited by the throttle opening, and an upper limit can be set for the output that the internal combustion engine 1 can output.

For example, a certain throttle opening A, B, C
The relationship between the rotation speed of the internal combustion engine and the output torque in (A <B <C) is as shown in FIG. Therefore, if the throttle opening is set to B, the maximum output of the internal combustion engine 1 becomes Y
[KW] or less. Therefore, the relationship between the throttle opening and the maximum output of the internal combustion engine 1 that can be output at that time is obtained and stored in advance as map data, and the throttle opening corresponding to the maximum output is referred to by referring to the map data. A mechanism for asking for degrees can be provided.

With respect to the throttle opening which suppresses the maximum output of the internal combustion engine 1 calculated by the throttle opening calculating section 31, the throttle opening restricting section 32 does not increase the throttle opening beyond the given throttle opening. To control.

FIG. 7 shows a mechanism for this purpose. A throttle valve 5 is rotatably mounted in the throttle body 3, and its opening is controlled by rotating the throttle valve 5 by an actuator 4. . A throttle opening regulating plate 41 is provided on the throttle body 3 so as to rotate coaxially with a rotation shaft 42 of the throttle valve 5. The throttle opening regulating plate 41 is provided so that its rotation position can be arbitrarily controlled by an actuator 43. It is. A regulating plate receiver 44 for regulating the rotation angle of the throttle opening regulating plate 41 is integrally attached to the throttle body 3.

Accordingly, the actuator 43 is driven in response to the throttle opening calculated by the throttle opening calculating section 31 to move the throttle opening regulating plate 41 from the closed position to a position rotated by an angle corresponding to the predetermined opening. Keep it. As a result, the control unit 1 shown in FIG.
When the actuator 2 drives the actuator 4 to open the throttle opening and rotates the throttle valve 5, when the throttle opening reaches a predetermined angle, the throttle opening regulating plate 41 contacts the regulating plate receiver 44 and rotates further. Is suppressed, whereby the rotation of the throttle valve 5 is also suppressed, so that the throttle opening is restricted from being increased beyond the throttle opening provided by the throttle opening calculating section 31, and the output of the internal combustion engine 1 is limited. .

In the control device for a series hybrid electric vehicle according to the second embodiment, the maximum chargeable power Pblim is calculated based on the state of the battery 8, and the power is generated based on the maximum chargeable power Pblim of the battery. The maximum output value Pglim allowed for the generator 6 is calculated, and the maximum output value Pelim allowed for the internal combustion engine 1 is calculated in accordance with the maximum output value Pglim allowed for the generator 6. The maximum allowable throttle opening of the internal combustion engine is calculated in accordance with the output value Pelim, and the amount of power generated by the generator 6 is controlled to be equal to or less than the allowable maximum power generation Pglim. By regulating not to open, the maximum power generation output Pglim of the generator 1 is restricted according to the state of the battery 8 and the slot of the internal combustion engine 1 is controlled according to the state of the battery. The valve 5 is regulated so as not to open more than the maximum allowable throttle opening, and even if a malfunction occurs on the generator side, the internal combustion engine side controls the rotation speed so that the power generation output on the generator side does not excessively increase. This limits battery overcharge.

[Brief description of the drawings]

FIG. 1 is a block diagram of a system configuration according to a first embodiment of the present invention.

FIG. 2 is a functional block diagram of the embodiment.

FIG. 3 is a graph showing a relationship between a battery maximum chargeable electric power and a k value in the embodiment.

FIG. 4 is a graph showing a relationship between an internal combustion engine speed and a generator maximum output in the embodiment.

FIG. 5 is a functional block diagram according to a second embodiment of the present invention.

FIG. 6 is a graph showing a relationship between the rotation speed of the internal combustion engine and the output torque in the embodiment.

FIG. 7 is an explanatory diagram of a throttle opening restriction mechanism used in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Internal combustion engine 3 Throttle body 4 Actuator 5 Throttle valve 6 Generator 7 Converter 8 Battery 9 Inverter 10 Drive motor 11 Battery state detection unit 12 Control unit 21 Battery maximum chargeable power calculation unit 22 Average power consumption calculation unit 23 Maximum power generation calculation Unit 24 internal combustion engine maximum rotation speed calculation unit 25 power generation amount command value setting unit 26 generator output control unit 27 internal combustion engine rotation speed command value setting unit 28 change rate limiting unit 29 internal combustion engine rotation speed control unit 30 internal combustion engine maximum output calculation unit 31 Throttle opening calculation section 32 Throttle opening restriction section 41 Throttle opening restriction plate 42 Rotary shaft 43 Actuator 44 Restriction plate receiver

Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical indication location H02J 7/14 H02J 7/14 C H02P 9/04 H02P 9/04 M (72) Inventor Hiroyuki Hirano Yokohama, Kanagawa Nissan Motor Co., Ltd., Nissan Motor Co., Ltd. (72) Inventor Eiji Inada Nissan Motor Co., Ltd., Nissan Motor Co., Ltd. Automobile Co., Ltd.

Claims (6)

[Claims] An internal combustion engine, a generator driven by the internal combustion engine, a battery charged by the generator, a drive motor driven by the battery, and a battery state monitor for detecting a state of the battery Means, maximum chargeable power calculation means for calculating the maximum chargeable power of the battery based on the state of the battery detected by the battery state monitoring means, and charging of the battery calculated by the maximum chargeable power calculation means Generator allowable maximum output calculation means for calculating a maximum output value allowed for the generator based on the maximum possible power; and the generator for calculating the power generation amount of the generator by the generator allowable maximum output calculation means Generator output control means for controlling the maximum output value to be equal to or less than an allowable maximum output value; Means for calculating a maximum speed of the internal combustion engine regulated in accordance with the maximum output value to be controlled; and A control device for a series hybrid electric vehicle, comprising: an internal combustion engine control means for controlling the rotation speed of the internal combustion engine. 2. An internal combustion engine, a throttle valve for controlling a flow rate of air-fuel mixture supplied to the internal combustion engine, a generator driven by the internal combustion engine, a battery charged by the generator, and the battery A drive motor driven by the battery; a battery state monitoring means for detecting the state of the battery; and a maximum chargeable power for calculating a maximum chargeable power of the battery based on the state of the battery detected by the battery state monitoring means. Calculating means; generator allowable maximum output calculating means for calculating a maximum output value allowed for the generator based on the maximum chargeable power of the battery calculated by the maximum chargeable power calculating means; and the generator A generator output for controlling the amount of generated power to be equal to or less than the maximum output value allowed for the generator calculated by the generator allowable maximum output calculation means. Control means, an internal combustion engine regulated maximum output computing means for calculating a maximum output value of the internal combustion engine regulated in accordance with a maximum output value allowed for the generator calculated by the generator allowable maximum output computing means, An allowable maximum throttle opening calculating means for calculating a maximum allowable throttle opening of the internal combustion engine according to the maximum output value of the internal combustion engine calculated by the internal combustion engine regulated maximum output calculating means; a maximum allowable throttle opening of the internal combustion engine; A control device for a series hybrid electric vehicle, comprising: throttle opening restriction means for restricting the throttle valve from opening more than one degree. 3. The maximum chargeable power calculating means calculates a maximum chargeable power of the battery based on a voltage, a temperature, and a remaining capacity detected by the battery state monitoring means. Or the control device of the series hybrid electric vehicle according to 2. 4. The power generation apparatus according to claim 1, wherein the generator allowable maximum output calculating means is configured to generate the power based on a maximum chargeable power of the battery calculated by the maximum chargeable power calculating means and an average value of power consumed by the drive motor. The control device for a series hybrid electric vehicle according to any one of claims 1 to 3, wherein a maximum output value allowed for the vehicle is calculated. 5. A maximum output value Pgl allowed for the generator.
im, the maximum power Pblim that can be charged by the battery, and the average power Pmtav consumed by the drive motor,
glim = Pblim + k · Pmtav, where the coefficient k is calculated as the maximum chargeable power Pbl of the battery.
5. The control of the series hybrid electric vehicle according to claim 4, wherein k = 1 is set when im is larger than the maximum output value allowed for the generator, and k = 0 otherwise. apparatus. 6. The internal combustion engine control means compares a time change rate of the maximum rotation speed of the internal combustion engine calculated by the internal combustion engine regulated maximum rotation speed calculation means with a predetermined value, and determines a large change exceeding the predetermined value. 2. The method according to claim 1, wherein the maximum speed of the internal combustion engine is regulated to a predetermined value or less.
6. The control device for a series hybrid electric vehicle according to 3, 4, or 5.