JP3405084B2 - Control device for series hybrid electric vehicle - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as a control device for a series hybrid electric vehicle, one disclosed in Japanese Patent Laid-Open No. 169203/1993 is known. In 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 rotational speed of the internal combustion engine. When the battery voltage fluctuates due to an increase or decrease in output, the rotational speed of the internal combustion engine also fluctuates correspondingly.

As a means for solving such problems,
A series hybrid electric system in which a generator is provided with a converter that controls the power generation output, and the output can be variably adjusted regardless of the internal combustion engine speed, making the internal combustion engine rotational speed less susceptible to battery voltage fluctuations. A vehicle controller has been proposed.

In the proposed control device for an electric vehicle, a microcomputer is used to control 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 is stable without frequent fluctuations, but malfunctions may occur due to the inclusion of noise, which is a general problem of microcomputer control. Since it is possible to automatically calculate the quantity command value, it is necessary to incorporate double safety measures to prevent overcharging.

The present invention has been made in order to solve such a conventional technical problem, and in a control device for a series hybrid electric vehicle having a structure in which a power generation output of a generator is controlled by control of a converter, a battery overcharge occurs. 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 device 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, a battery state monitoring means for detecting a 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 Generator maximum output value calculating means for calculating the maximum output value allowable for the generator, and the amount of power generation of the generator is equal to or less than the maximum output value allowable for the generator calculated by the generator allowable maximum output calculating means. It is regulated according to the generator output control means for controlling and the maximum output value allowed by the generator calculated by the generator maximum output calculating means. The internal combustion engine regulation maximum rotation speed calculating means for calculating the maximum rotation speed of the internal combustion engine, And an 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 calculation 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 the maximum output value allowed for the generator based on the maximum chargeable electric power of the battery calculated by the maximum chargeable power calculation means, and the internal combustion engine regulation maximum rotation speed calculation means The maximum rotation speed allowed for the internal combustion engine is calculated according to the maximum output value allowed by the generator calculated by the generator maximum output calculation means.

Then, the generator output control means controls the power generation amount of the generator to be equal to or less than the maximum output value calculated by the generator allowable maximum output calculation means, and at the same time, the internal combustion engine control means controls the internal combustion engine regulation maximum speed calculation means. The rotational speed of the internal combustion engine is controlled so as to be less than or equal to the maximum rotational speed of the internal combustion engine calculated by.

In this way, the maximum power generation output of the generator is limited according to the state of the battery, and the maximum rotation speed of the internal combustion engine is also regulated according to the state of the battery, so that even if the generator side malfunctions. The internal combustion engine limits the rotational speed so that the power generation output on the generator side does not increase excessively and prevents battery overcharging.

A control device for a series hybrid electric vehicle according to a second aspect of the present invention comprises 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, a battery state monitoring means for detecting a 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 Generator maximum output value calculating means for calculating the maximum output value allowable for the generator, and the amount of power generation of the generator is equal to or less than the maximum output value allowable for the generator calculated by the generator allowable maximum output calculating means. The generator output control means for controlling and the regulation according to the 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, which calculates the maximum output value of the internal combustion engine. And an allowable maximum throttle opening calculation means for calculating the degree, and a throttle opening restriction means for restricting the throttle valve from opening above the maximum allowable throttle opening of the internal combustion engine.

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 battery state detected by the battery state monitoring means. ,
The generator allowable maximum output calculation means calculates the 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 the internal combustion engine regulation maximum output calculation means further generates electricity. The maximum allowable output value of the internal combustion engine is calculated according to the maximum output value of the generator calculated by the maximum allowable engine output calculating means, and the maximum allowable throttle opening calculating means is the maximum output calculating means of the internal combustion engine. The maximum allowable throttle opening of the internal combustion engine is calculated according to the calculated maximum output value of the internal combustion engine.

Then, the generator output control means controls the power generation amount of the generator to be equal to or less than the maximum output value calculated by the generator allowable maximum output calculating means, and at the same time, the throttle opening regulating means controls the maximum allowable throttle of the internal combustion engine. Restrict the throttle valve so that it does not open beyond the opening.

In this way, 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 controlled so as not to open beyond the maximum allowable throttle opening according to the state of the battery. (1) Even if there is a malfunction on the generator side, the internal combustion engine limits the rotational speed so that the power output of 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 computing means is based on the voltage, temperature and remaining capacity detected by the battery state monitoring means. The maximum chargeable electric power of the battery is calculated.

According to a fourth aspect of the present invention, in the control device for a series hybrid electric vehicle according to any one of the first to third aspects, the generator allowable maximum output calculation means calculates the maximum chargeable power calculation means by the battery. The maximum output value allowed for the generator is calculated based on the maximum chargeable electric power and the average value of the electric power consumed by the drive motor.

According to a fifth aspect of the present invention, in the control device for a series hybrid electric vehicle according to the fourth aspect, the maximum output value Pglim allowed for the generator, the maximum chargeable electric power Pblim of the battery, and the drive motor. Pglim = Pblim + k · Pmtav between the average power consumption Pmtav of
Where the coefficient k is k = 1 when the maximum chargeable electric power Pbmax of the battery is larger than the maximum output value Pgmax allowed by 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 supplemented while the battery is controlled 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 by the maximum internal combustion engine speed limit calculation means. The time change rate of the maximum engine speed is compared with a predetermined value, and when there is a large change exceeding the predetermined value, the maximum engine speed of the internal combustion engine is restricted to a predetermined value or less.

In the control device for a series hybrid electric vehicle according to the present invention, the rate of change of the maximum speed of the internal combustion engine with time is monitored, and when the rate of change exceeds a predetermined value, the rate of change is regulated so that the noise of the internal combustion engine is reduced. To prevent sudden increases in size.

[0021]

According to the inventions of claims 1 and 3,
The maximum power generation output of the generator is limited according to the state of the battery, and the maximum rotation speed of the internal combustion engine is also regulated according to the state of the battery. Even if there is a malfunction on the generator side, the internal combustion engine It is possible to prevent the battery from being overcharged by limiting the rotation speed so that the power generation output on the generator side does not increase excessively.

According to the second and third aspects of the present invention, the maximum power generation output of the generator is limited according to the state of the battery, and the throttle valve of the internal combustion engine is greater than the maximum allowable throttle opening degree according to the state of the battery. Since it is regulated so that the internal combustion engine side does not excessively increase the power generation output of the generator side even if there is a malfunction on the generator side, the engine speed is limited and the battery Charging can be prevented.

According to the inventions of claims 4 and 5, 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 rate of change of the maximum speed of the internal combustion engine is monitored, and when the rate exceeds a predetermined value, the rate of change is regulated, so that the sound of the internal combustion engine suddenly becomes extremely loud. Can be prevented.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below 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. This control device for a 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, and 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. The rotation speed of is controlled.

The output shaft of the internal combustion engine 1 has a generator (GE) 6
Are connected so that the driving torque is transmitted, and the generator 6 is rotationally driven by the rotation of the internal combustion engine 1 to generate three-phase AC power. A converter (CONV) 7 is installed on the output side of the generator 6 to convert the output generated by the generator 6 to AC / DC.

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

The functional configuration of the control arithmetic processing executed by the control unit 12 is as shown in FIG. From the battery state detection unit 11, the battery voltage, temperature,
A battery (Batt) maximum chargeable power calculator 21 that inputs the remaining capacity (SOC) to calculate the maximum power that can be charged to the battery 8, and an average that calculates the average power consumption based on the input voltage and current to the inverter 9. Power consumption calculation unit 22 and these battery maximum chargeable power calculation unit 21
Battery maximum chargeable power and average power consumption calculation unit 22
Maximum power generation amount calculation unit 23 that calculates the maximum power generation amount Pglim of the generator 6 based on the average power consumption of the generator 6, and the rotation speed Nli of the internal combustion engine 1 corresponding to the maximum power generation amount Pglim.
Internal combustion engine (ENG) maximum speed calculator 24 for calculating m
It has and.

The output command value of the generator 8 (power generation amount command P
*) Is set to a fixed value, or is set variably according to vehicle speed, average power consumption, battery remaining capacity, etc., and maximum power generation amount Pglim calculated by the maximum power generation amount calculation unit 23 and power generation amount. The power generation amount command value P * output by the command value setting unit 25, whichever is smaller, min (P *
, 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 is variably set according to the vehicle speed, average power consumption, battery remaining capacity, etc. (EN
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) is based on a rate-of-change limiting unit 28 that limits the rate of change with time, a rotation speed command value output through the rate-of-change controlling unit 28, a battery voltage, and a battery temperature. The internal combustion engine (ENG) rotational speed limiting unit 29 that controls the rotational speed of the internal combustion engine 1 is provided.

Next, the operation of the control device for the series hybrid electric vehicle having the above configuration will be described. The maximum battery chargeable power calculation unit 21 calculates the maximum power Pblim with which the battery 8 can be charged, based on the voltage, temperature, and remaining capacity (SOC) of the battery 8 provided from the battery state detection unit 11. This calculation formula is Japanese Patent Application No. 7-239.
The one specified in the specification of No. 628 is used.

The average power consumption calculation unit 22 calculates the average value Pmtav of the power consumed by the drive motor 10 during a certain period.
To calculate. This calculation is performed by monitoring the voltage and current input to the inverter 9, calculating the input power from the product of these, and further averaging over time.

In the maximum power generation amount calculation unit 23, the maximum chargeable power Pblim of the battery 8 is input from the battery maximum chargeable power calculation unit 21, the average power consumption Pmtav is input from the average power consumption calculation unit 22, and the generator The upper limit value Pglim of the power generation output of 6 is calculated. The upper limit value of the power generation output of the generator 6 is, for example, a limit value that means that if the battery 8 is charged with a power generation amount higher than this, there is a risk of overcharge or overvoltage, Calculate by

Pglim = Pblim + kPmtav Here, k is a coefficient for correcting the difference between the average power consumption and the actual instantaneous value of power consumption, and a constant value can be set, but as shown in FIG. It can also be variably set according to the maximum chargeable power of the battery. Figure 3
In the case of the variable setting shown in, the maximum battery chargeable power P
When blim is large and is larger than the maximum output of the generator 6, k = 1 is set and the average power consumption Pmtav is added as it is, and when the battery maximum chargeable power Pblim is small, k = 0. Therefore, 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.

Note that when k = 0, the term of average power consumption is not added at all, and the maximum allowable power generation amount Pglim = the maximum battery chargeable power Pbl
You can also set it to im.

With respect to the maximum allowable power generation amount Pglim output by the maximum power generation amount calculation unit 23, the internal combustion engine maximum rotation speed calculation unit 24 outputs the maximum rotation speed of the internal combustion engine 1 required to output this power generation amount (therefore, the maximum rotation speed). , The maximum speed Nlim of the generator 6 which is proportional to the speed of the internal combustion engine 1 is calculated. The maximum rotation speed Nlim is determined with respect to the output characteristic of the internal combustion engine 1, the output characteristic of the generator 6, the induced voltage characteristic, and the like. The internal combustion engine 1 has a maximum value that can be output for each rotation speed, and the induced voltage of the generator 6 is determined according to the drive rotation speed, and the maximum value of the power generation amount for each rotation speed depends on the current capacity. Exists. Generally, the maximum output values of the internal combustion engine 1 and the generator 6 have a characteristic that they increase as the rotation speed increases. Conversely, when it is desired to set an upper limit value in the output, the output is suppressed by limiting the rotation speed. You can Although FIG. 4 shows an example of the relationship between the rotation speed of the internal combustion engine 1 and the maximum power generation amount, 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.

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

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

The generator output control unit 26 inputs the output Pglim of the maximum power generation amount calculation unit 23 or the power generation amount command value P *, whichever is smaller, min (P *, Pglim), and the converter 7
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 revolutions 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 so that the detected output actual current value matches the current command value.

The contents of the calculation for determining the power element drive signal in the converter 7 in the generator output control unit 26 are realized by the same operation as the power element drive signal in the inverter 9 for driving the drive motor 10. If the torque command value in motor control is a positive value, it will be a motor operation, and if it is a negative value, it will be a generator operation.
It is possible to perform an operation of converting kinetic energy given to a motor (generator) into electric power. As such a motor control method, the one proposed in "1993 Annual Meeting of the Institute of Electrical Engineers of Japan, Proceedings [6], S10.-3" is used.

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

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

The internal-combustion-engine speed control unit 29 then outputs the internal-combustion-engine maximum speed Nlim output from the internal-combustion-engine maximum speed calculation unit 24 and the internal combustion engine (ENG) speed command from the internal combustion engine 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 input rotation speed command value matches the rotation speed of the internal combustion engine 1. By driving the actuator 4 of No. 5, the amount of intake air into the internal combustion engine 1 is changed by a required amount, and the rotational speed of the internal combustion engine 1 is controlled.

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

In this way, in the controller for the series hybrid electric vehicle of the first embodiment, the maximum chargeable power Pblim is calculated based on the state of the battery 8, and the maximum chargeable power of the battery 8 is calculated. The maximum output value Pglim allowed for the generator 6 is calculated based on Pblim,
Further, the maximum rotation speed Nlim allowed for the internal combustion engine 1 is calculated according to the maximum output value Pglim allowed for the generator 6, and the power generation amount of the generator 6 is controlled to be equal to or less than the maximum output value Pglim. By controlling the rotation speed of the internal combustion engine 1 so as to be less than or equal to the maximum rotation speed Nlim of 1, the maximum power generation output Pglim of the generator 6 is limited according to the state of the battery 8, and the internal combustion engine is also changed according to the state of the battery. By also limiting the maximum rotation speed Nlim of 1, even if the generator side malfunctions, the internal combustion engine side limits the rotation speed so that the power generation output of the generator side does not increase excessively, and the battery overrun 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 for the series hybrid electric vehicle according to the second embodiment has the maximum allowable power generation amount Pglim of the generator 6 corresponding to the maximum chargeable electric power Pblim of the battery 8. Then, 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 a throttle opening corresponding to Weng output from the internal combustion engine maximum output calculation unit 30 Arithmetic unit 3
1 and a throttle opening degree regulation unit 32 that regulates the actuator 4 so that the throttle valve 5 is adjusted to the throttle opening degree calculated by the throttle opening degree calculation unit 31. Other parts are shown in FIG.
Since the second embodiment is common to the first embodiment shown in FIG. 2, the same parts are denoted by the same reference numerals and detailed description thereof will be omitted.

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

The internal-combustion-period maximum output calculator 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. Further, since the input / output efficiency of the generator 6 is generally 70 to 90%, it is not necessary to divide the input / output efficiency in the case of a highly efficient generator 6, and in this case, the maximum output of the internal combustion engine The calculation unit 30 is eliminated, and the output of the maximum power generation amount calculation unit 23 is directly output to the throttle opening calculation unit 3
The configuration may be given to 1.

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

The output value generated by the internal combustion engine 1 and the throttle opening cannot always be uniquely related, and are influenced by the rotational speed of the internal combustion engine 1, the fuel injection state, and the like. However, it is possible to limit the intake air amount by the throttle opening and set the upper limit to the output that the internal combustion engine 1 can output.

For example, a certain throttle opening A, B, C
The relationship between the rotational speed of the internal combustion engine and the output torque at (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 will be Y
It can be suppressed to [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, stored as map data in advance, and the throttle opening corresponding to the maximum output is referenced by referring to the map data. It can be a mechanism to ask for degrees.

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 raise the throttle opening more than the given throttle opening. To control.

The mechanism for this is shown in FIG. 7, in which the throttle valve 5 is rotatably mounted in the throttle body 3, and the opening degree is controlled by rotating the throttle valve 5 by the actuator 4. . A throttle opening restricting plate 41 is provided on the throttle body 3 so as to rotate coaxially with a rotating shaft 42 of the throttle valve 5. The throttle opening restricting plate 41 allows an actuator 43 to arbitrarily control its rotational position. There is. A regulation plate receiver 44 that regulates the rotation angle of the throttle opening regulation plate 41 is integrally attached to the throttle body 3.

Therefore, the actuator 43 is driven with respect to the throttle opening calculated by the throttle opening calculating section 31 so that the throttle opening regulating plate 41 is rotated from the closed position by an angle corresponding to the predetermined opening. Keep it. As a result, the control unit 1 shown in FIG.
When 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 restriction plate 41 contacts the restriction plate receiver 44 and rotates further. The throttle valve 5 is also prevented from rotating, and the throttle opening is controlled so as not to exceed the throttle opening given by the throttle opening calculator 31 to limit the output of the internal combustion engine 1. .

In the controller for the series hybrid electric vehicle of the second embodiment, the maximum chargeable electric power Pblim is calculated based on the state of the battery 8, and the power generation is performed based on the maximum chargeable electric power Pblim of the battery. The maximum output value Pglim allowed for the engine 6 is calculated, and the maximum output value Pelim allowed for the internal combustion engine 1 is calculated according to the maximum output value Pglim allowed for the generator 6. The maximum allowable throttle opening of the internal combustion engine is calculated according to the output value Pelim, and the power generation amount of the generator 6 is controlled to be equal to or lower than the maximum allowable power generation amount Pglim. The maximum power generation output Pglim of the generator 1 is limited according to the state of the battery 8 by restricting the opening so that the slot of the internal combustion engine 1 is not changed according to the battery state. The valve 5 is regulated so as not to open beyond the maximum allowable throttle opening, and even if there is a malfunction on the generator side, the engine speed is controlled so that the power generation output on the generator side does not increase excessively. It limits and prevents battery overcharge.

[Brief description of drawings]

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

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

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

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

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

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

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

[Explanation of symbols]

1 Internal combustion engine 3 Throttle body 4 actuators 5 Throttle valve 6 generator 7 converter 8 battery 9 inverter 10 Drive motor 11 Battery state detector 12 Control unit 21 Battery maximum chargeable power calculator 22 Average power consumption calculator 23 Maximum power generation calculation unit 24 Internal combustion engine maximum speed calculation unit 25 Power generation command value setting section 26 Generator output control section 27 Internal combustion engine speed command value setting unit 28 Change rate limiter 29 Internal combustion engine speed control unit 30 Internal combustion engine maximum output calculation unit 31 Throttle opening calculation unit 32 Throttle opening regulation part 41 Throttle opening regulation plate 42 rotation axis 43 Actuator 44 Regulator plate receiver

Continuation of front page (51) Int.Cl. ⁷ Identification symbol FI H02P 9/04 H02P 9/04 M (72) Inventor Hiroyuki Hirano 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. (72) Invention Eiji Inada 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Yutaro Kaneko 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (56) Reference Japanese Patent Laid-Open No. 8 -37702 (JP, A) JP 7-236203 (JP, A) JP 8-154308 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02J ^7/ 00- 7/36 B60L 11/00-11/18 H02P 9/04

Claims (6)

(57) [Claims] 1. 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, a 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 status monitoring means, and a charging of the battery calculated by the maximum chargeable power calculation means Generator allowable maximum output calculating means for calculating a maximum output value allowed for the generator based on the maximum possible electric power; and the generator calculating the power generation amount of the generator by the generator allowable maximum output calculating means. Generator output control means for controlling the output power to be less than or equal to the maximum output value allowed for the generator, and the generator output allowed by the generator maximum output calculation means The maximum rotation speed of the internal combustion engine regulated according to the maximum output value of the internal combustion engine, and the maximum rotation speed of the internal combustion engine calculated by the internal combustion engine regulation maximum rotation speed calculation means A control device for a series hybrid electric vehicle, comprising: an internal combustion engine control means for controlling the number of revolutions of the internal combustion engine. 2. 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, and the battery A drive motor driven by a battery, a battery state monitoring unit that detects the state of the battery, and a maximum chargeable power that calculates the maximum chargeable power of the battery based on the state of the battery detected by the battery state monitoring unit. 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 Generator output for controlling the power generation amount of the generator to be equal to or less than the maximum output value allowed by the generator calculated by the generator allowable maximum output calculation means. Control means, an internal combustion engine regulation maximum output calculation means for calculating the maximum output value of the internal combustion engine regulated according to the maximum output value allowed by the generator calculated by the generator allowable maximum output calculation means, An allowable maximum throttle opening calculation means for calculating a maximum allowable throttle opening of the internal combustion engine according to a maximum output value of the internal combustion engine calculated by the internal combustion engine regulation maximum output calculation means; and a maximum allowable throttle opening of the internal combustion engine. A control device for a series hybrid electric vehicle, comprising: throttle opening regulating means for regulating the throttle valve from opening more than once. 3. The maximum chargeable power calculation means calculates the maximum chargeable power of the battery based on the voltage, temperature and remaining capacity detected by the battery state monitoring means. Alternatively, the control device for the series hybrid electric vehicle according to item 2. 4. The power generation based on the maximum chargeable power of the battery calculated by the maximum chargeable power calculation means and the average value of the power consumed by the drive motor, the generator allowable maximum output calculation means. The controller for a series hybrid electric vehicle according to any one of claims 1 to 3, wherein a maximum output value allowed for the machine is calculated. 5. The maximum output value Pgl allowed for the generator
Between im, the maximum chargeable electric power Pblim of the battery, and the average electric power value Pmtav consumed by the drive motor, P
glim = Pblim + k · Pmtav is calculated, and the coefficient k is calculated as the maximum chargeable electric power Pbl of the battery.
The control of the series hybrid electric vehicle according to claim 4, wherein when im is larger than the maximum output value allowed for the generator, k = 1 is set, and when not, k = 0 is set. 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 regulation maximum rotation speed calculation means with a predetermined value, and with a large change exceeding the predetermined value. At a certain time, the maximum rotation speed of the internal combustion engine is regulated to a predetermined value or less.
The control device for a series hybrid electric vehicle according to 3, 4, or 5.