JPH11103501A - Control device of hybrid vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the generation of noise and, at the same time, generate a required generation power, by referring to the data of an engine rotary speed for a generated power and the resonance speed of a body for a vehicle speed and the engine rotary speed, and setting the engine rotary speed outside a resonance region where a required generation power can be generated. SOLUTION: A vehicle controller 10 has such peripheral parts as a microcomputer and a memory 10a, controls such on board equipment as an engine 1, an engine controller 3, a battery 4, a generator controller 5, and a motor controller 6, and at the same time executes a control program and avoids the resonance between the engine 1 driving a generator and a body, and at the same time controls the engine and the generator so that a required generation power can be met. A vehicle speed sensor 11 for detecting the driving speed of a vehicle, a rotary sensor 12 for detecting the rotary speed of the engine 1, or the like are connected to the vehicle controller 10. Resonance data between the engine 1 and the body are stored in the memory 10a.

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 hybrid vehicle, and more particularly to a device for preventing vibration and noise due to resonance between a generator driving engine and a vehicle body.

[0002]

2. Description of the Related Art In order to prevent vibration and noise caused by resonance between a generator driving engine and a vehicle body, the rotation speed of the generator driving engine is reduced to a low power generation speed, a medium power generation speed, and a high power generation speed. There is known a hybrid vehicle control device that sets the power speed and changes the rotation speed of the engine through a resonance speed region with the vehicle body so as to minimize the power generated by the generator (for example, JP-A-7-231
No. 509).

[0003]

However, in the above-described conventional hybrid vehicle control device, the generated power is minimized when the rotation speed of the generator driving engine is changed. In some cases, power is consumed unnecessarily, or the required generated power cannot be satisfied based on the running conditions of the vehicle or the charged amount of the battery.

An object of the present invention is to control an engine and a generator so as to satisfy required power generation while avoiding resonance between a generator driving engine and a vehicle body.

[0005]

[Means for Solving the Problems]

(1) The invention of claim 1 is applied to a control device for a hybrid vehicle that supplies power generated by a generator driven by an engine to a battery and a traveling motor. And a vehicle speed detecting means for detecting a vehicle speed, a rotational speed detecting means for detecting a rotational speed of the engine, and a power calculating means for calculating a required generated power of the generator based on running conditions of the vehicle and a charged amount of the battery. A rotation speed setting means for setting an engine rotation speed outside a resonance region capable of generating required power generation by referring to engine speed data for generated power and vehicle body resonance data for vehicle speed and engine speed, Power generation control means for controlling the engine at the set rotation speed. (2) In the control device for a hybrid vehicle according to the second aspect, the current engine speed is maintained by the rotation speed setting means when the current engine speed is outside the resonance region. (3) The control device for a hybrid vehicle according to claim 3, wherein the current engine rotation speed is determined by the rotation speed setting means.
When both the rotation speed required to generate the required power generated from the engine rotation speed data and the rotation speed are within the same non-resonance region, the required rotation speed is set. (4) The control device for a hybrid vehicle according to claim 4, wherein the rotation speed setting means sets the current engine rotation speed to:
If the rotation speed required to generate the required power generated from the engine rotation speed data is within the resonance region, the maximum rotation speed outside the resonance region that is lower than the required rotation speed is set. It was done. (5) The control device for a hybrid vehicle according to claim 5, wherein the rotation speed setting means requests the current engine rotation speed to be within the resonance region and generate the required power generated from the engine rotation speed data. When the rotation speed to be performed is outside the resonance region, the required rotation speed is set. (6) In the control device for a hybrid vehicle according to claim 6, when the vehicle speed is higher than a predetermined speed by the rotation speed setting means, the rotation required to generate the required power generated from the engine rotation speed data is generated. The speed is set. (7) The control apparatus for a hybrid vehicle according to claim 7, wherein the power generation control means sets an engine rotation speed different from a rotation speed required to generate required power generated from the engine rotation speed data. Is such that the output of the generator is adjusted in accordance with the difference in rotation speed. (8) In the control device for a hybrid vehicle according to claim 8, the engine rotation speed data is set in consideration of the fuel consumption rate of the engine.

[0006]

【The invention's effect】

(1) According to the first aspect of the present invention, referring to the data of the engine rotation speed with respect to the generated power and the resonance data of the vehicle body with respect to the vehicle speed and the engine rotation speed, the engine outside the resonance region capable of generating the required power generation Since I set the rotation speed and operated the engine at that set rotation speed,
The required generated power can be generated while suppressing generation of noise while avoiding resonance between the generator driving engine and the vehicle body. (2) According to the second aspect of the invention, when the current engine rotation speed is outside the resonance region, the current engine rotation speed is maintained, so that the noise caused by the resonance between the engine and the vehicle body is reduced. Occurrence can be prevented. (3) According to the third aspect of the invention, the current engine speed and the speed required to generate the required power generated from the engine speed data are both in the same non-resonant region. In this case, the required rotational speed is set, so that the required power can be generated while avoiding the resonance between the generator driving engine and the vehicle body and preventing the generation of noise. (4) According to the invention of claim 4, when both the current engine rotation speed and the rotation speed required to generate the required power generated from the engine rotation speed data are within the resonance region, Since the maximum rotation speed outside the resonance region lower than the required rotation speed is set, the same effect as that of the first aspect can be obtained. (5) According to the invention of claim 5, the current engine speed is within the resonance region, and the rotation speed required to generate the required power generated from the engine speed data is outside the resonance region. In this case, the required rotational speed is set, so that the same effect as that of the first aspect can be obtained. (6) According to the invention of claim 6, when the vehicle speed is higher than the predetermined speed, the rotation speed required to generate the required power generated from the engine rotation speed data is set. In a region where the vehicle speed is high, the required generated power can always be satisfied. (7) According to the invention of claim 7, when an engine speed different from the engine speed required to generate the required power generated from the engine speed data is set, the engine speed is determined according to the engine speed difference. Thus, the output of the generator is adjusted, so that the required electric power can always be generated while suppressing noise caused by resonance between the engine and the vehicle body. (8) According to the invention of claim 8, since the engine speed data is set in consideration of the fuel consumption rate of the engine,
The fuel efficiency of the engine can be improved.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a series hybrid vehicle (SHEV) will be described.
FIG. 1 is a diagram showing the configuration of the first embodiment. The engine 1 is a prime mover for driving the generator 2, and an internal combustion engine such as a gasoline engine or a diesel engine is used. The engine controller 3 controls the rotation speed and the torque of the engine 1. The generator 2 is a rotating machine that generates electric power used for running the vehicle and charging the battery 4, and a three-phase AC generator or the like is used. The generator controller 5 controls the generated power of the generator 2, converts the generated three-phase AC power into DC power, and supplies the DC power to the motor controller 6 and the battery 4.

The motor controller 6 includes an inverter and a control device, converts DC power into AC power, and supplies the AC power to the traveling motor 7. The traveling motor 7 is a rotating machine serving as a traveling drive source of the vehicle, and a three-phase synchronous motor or a three-phase induction motor is used. The battery 4 is a battery for supplying power to the traveling motor 7, and is charged by the generated power from the generator 2 and the regenerative power from the motor 7. Note that an electric double layer power capacitor can be used for the battery 4. The driving force of the traveling motor 7 is transmitted to the driving wheels 9 via the driving mechanism 8.

The vehicle controller 10 includes a microcomputer and peripheral parts such as a memory 10a, and controls on-vehicle devices such as an engine 1, an engine controller 3, a battery 4, a generator controller 5, a motor controller 6, and a control program to be described later. Is executed to control the engine and the generator so as to satisfy the required generated power while avoiding the resonance between the generator driving engine 1 and the vehicle body. The vehicle controller 10 is connected to a vehicle speed sensor 11 for detecting a running speed V of the vehicle, a rotation sensor 12 for detecting a rotation speed N of the engine 1, and the like.

In the memory 10a, resonance data of the engine 1 and the vehicle body using the vehicle speed V and the engine rotation speed N as parameters are stored in a mapped form in advance. The resonance map data is measured by an experiment using an actual machine or a simulation. Also, the memory 10a stores a required rotation speed N of the engine for the required generated power P.
Are mapped and stored in advance. The required rotation speed map data is determined in consideration of the fuel consumption rate of the engine 1. Further, data of road noise having the vehicle speed V as a parameter is mapped and stored in the memory 10a. The road noise map data is also measured by experiments using actual machines or by simulation.

FIG. 2 shows the noise level with respect to the vehicle speed of the series hybrid vehicle. In a series hybrid vehicle, the noise generated from the engine side increases substantially in proportion to the vehicle speed, and the noise generated from the traveling motor side is substantially constant with changes in the vehicle speed. On the other hand, road noise caused by running of the vehicle increases in proportion to the vehicle speed. As a result,
In the area 1 below the vehicle speed V1 where the road noise level exceeds the noise level on the engine side, the noise level generated from the engine side is higher than the road noise level. The overall noise suppression effect can be expected. However, in the area 2 exceeding the vehicle speed V1, the road noise level is higher than the noise level generated from the engine side, so that even if the engine side noise is suppressed, there is no noise suppression effect for the entire vehicle.

FIGS. 3 and 4 show the vehicle speed range 1 shown in FIG.
Shows the engine-side noise level with respect to the engine rotation speed when the vehicle speed is constant. Also, FIG.
In the vehicle speed region 2 shown in FIG. 2, the noise level on the engine side with respect to the engine rotation speed when the vehicle speed is constant is shown. As shown in FIGS. 3 and 4, in the vehicle speed region 1, there is a resonance region exceeding an allowable level due to resonance between the engine and the vehicle body, and therefore, driving in that region must be avoided.

In this embodiment, in the vehicle speed region 1, the engine rotation speed (hereinafter, referred to as the required rotation speed) required to generate the required power generated from the required rotation speed data of the engine is within the resonance region. , The engine is operated at the maximum non-resonant speed lower than the required rotational speed as shown in FIG. On the other hand, when the required rotational speed is outside the resonance region, the engine is operated at the required rotational speed as shown in FIG. However, if the current rotation speed is outside the resonance region, the current rotation speed is maintained.

In the vehicle speed region 2, the road noise level must be set to an allowable level, so that the noise level due to the resonance between the generator driving engine and the vehicle body is lower than the allowable level, and there is no unusable region. . Therefore,
Always run the engine at the required speed.

FIG. 6 shows a resonance region with respect to the vehicle speed and the rotation speed of the generator driving engine, and a control example of one embodiment. As described above, since there are a plurality of resonance regions in the vehicle speed region 1, when the required rotation speed changes as shown by the broken line, the command rotation speed of the engine is set as shown by the solid line. That is, in the vehicle speed region 1, when the current rotation speed is outside the resonance region, the current rotation speed is maintained. The current rotational speed is within the resonance region, and
If the required rotation speed is outside the resonance region, the speed immediately shifts to the required rotation speed. If both the current rotational speed and the required rotational speed are within the resonance region, a maximum non-resonant speed lower than the required rotational speed is obtained, and the process proceeds to that rotational speed. On the other hand, in the vehicle speed region 2, the engine is always operated according to the required rotation speed.

FIG. 7 is a flowchart showing power generation control according to one embodiment. The operation of the embodiment will be described with reference to this flowchart. Vehicle controller 10
Executes the power generation control program at predetermined time intervals. In step 1, the vehicle speed V and the engine speed N
And the battery charge amount SOC is detected. As the method of detecting the battery charge amount SOC, for example, a method based on integration of charge / discharge current, a method based on open-circuit voltage, a calculation method based on voltage and current during charge / discharge, and the like can be used. In the following step 2, the required generated power P is calculated based on the vehicle running conditions such as the vehicle speed V and the state of charge SOC of the battery 4. In step 3, the required generated power P and the memory 10
a based on the required rotation speed map stored in
The required rotation speed N * of the engine 1 is calculated.

In step 4, it is determined whether or not the current vehicle speed V is equal to or lower than the vehicle speed V1 at which the road noise level exceeds the engine-side noise level, that is, whether or not the vehicle speed V is in the above-described vehicle speed region 1. Vehicle speed area 1
, And proceeds to step 5. If the speed is higher than the vehicle speed V 1, it is determined that the vehicle is in the vehicle speed region 2 and the process proceeds to step 6.
If the current vehicle speed V is in the vehicle speed region 2, the engine controller 3 is controlled in step 6 to operate the engine 1 at the required rotation speed N *.

On the other hand, if the current vehicle speed V is in the vehicle speed region 1, it is determined in step 5 whether or not the current engine speed N is in the resonance region with reference to the resonance map data. If the current engine rotation speed N is within the resonance region, the process proceeds to step 7; otherwise, the process proceeds to step 9. If the current engine speed N is outside the resonance range, the current engine speed N is maintained in step 9. Then, the process proceeds to step 10, in which the shortage of the generated power according to the difference (N * −N) between the required rotation speed N * and the current rotation speed N is adjusted by the generator controller 5 to obtain the required generated power P I do. Specifically, the output, that is, the generated power is adjusted by increasing or decreasing the field current of the generator 2.

If the current engine speed N is within the resonance region, it is determined in step 7 whether or not the required rotation speed N * is within the resonance region by referring to the resonance map data. If the required field rotation speed N * is within the resonance region, the process proceeds to step 8; otherwise, the process proceeds to step 6. The current rotational speed N is within the resonance region, and the required rotational speed N
If * is outside the resonance region, the routine immediately shifts to the required rotation speed N * in step 6.

If the current rotational speed N and the required rotational speed N * are both within the resonance region, at step 8, the required rotational speed is lower than the required rotational speed N * by referring to the resonance map data, and The maximum rotation speed N 'is newly set as the engine rotation speed. In the following step 10, the difference (N * −) between the required rotation speed N * and the newly set rotation speed N ′ is determined.
The shortage of the generated power according to N ′) is adjusted by the generator controller 5 to obtain the required generated power P.

-Modification of Embodiment of the Invention-In the above-described embodiment, an example in which the current engine speed is maintained when the current engine speed is outside the resonance region has been described. If it is possible to shift from the rotation speed to the required rotation speed without passing through the resonance region, the speed may be immediately shifted to the required rotation speed.

FIG. 8 is a flowchart showing a power generation control according to a modification of the embodiment. Note that steps having the same operations as those in the flowchart shown in FIG. 7 are denoted by the same step numbers, and the description will focus on differences. If the current rotation speed N is outside the resonance region, in step 9A, whether the current rotation speed N and the required rotation speed N * are both within the same non-resonance region, that is, the required rotation speed N * It is determined whether or not it is necessary to pass through the resonance region in order to move to. Even if the required rotation speed N * is outside the resonance region, if it is not possible to shift without passing through the resonance region, the process proceeds to step 9 and the current rotation speed N is maintained. On the other hand, if the current rotational speed N and the required rotational speed N * are in the same non-resonant region, the required rotational speed N * is immediately
Even if the process proceeds to step S6, the required generated power P can be generated without generating noise due to resonance during the process and without adjusting the output of the generator. Operate engine 1 with *.

In the configuration of the above embodiment, the vehicle speed sensor 11 constitutes the vehicle speed detecting means, the rotation sensor 12 constitutes the rotational speed detecting means, and the vehicle controller 10 constitutes the electric power calculating means, the rotating speed setting means and the power generation controlling means. I do.

In the above-described embodiment and its modification,
When the engine cannot be operated at the required rotation speed N *, the output of the generator is adjusted. However, if some shortage of generated power is tolerated, it is not always necessary to adjust the output by the generator.

In the above-described embodiment and its modification,
Although an example in which the present invention is applied to a series hybrid vehicle has been described, the present invention is not limited to a series hybrid vehicle and can be applied to power generation control of, for example, a series-parallel hybrid vehicle (SPHV).

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment.

FIG. 2 is a diagram illustrating a noise level with respect to a vehicle speed of a series hybrid vehicle.

FIG. 3 is a diagram showing the engine-side noise level with respect to the engine rotation speed when the vehicle speed is constant in a vehicle speed region where the engine-side noise level is higher than the road noise level.

FIG. 4 is a diagram showing the engine-side noise level with respect to the engine rotation speed when the vehicle speed is constant in a vehicle speed region where the engine-side noise level is higher than the road noise level.

FIG. 5 is a diagram illustrating the engine-side noise level with respect to the engine rotation speed when the vehicle speed is constant in a vehicle speed region where the engine-side noise level is lower than the road noise level.

FIG. 6 is a diagram illustrating a resonance region with respect to a vehicle speed and an engine rotation speed, and a control example of an embodiment;

FIG. 7 is a flowchart illustrating power generation control according to one embodiment.

FIG. 8 is a flowchart illustrating a power generation control according to a modification of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Generator driving engine 2 Generator 3 Engine controller 4 Battery 5 Generator controller 6 Motor controller 7 Driving motor 8 Drive mechanism 9 Driving wheel 10 Vehicle controller 10a Memory 11 Vehicle speed sensor 12 Rotation sensor

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroyuki Hirano 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture Nissan Motor Co., Ltd. (72) Inventor Eiji Inada 2 Takaracho, Kanagawa-ku, Yokohama City, Kanagawa Nissan Motor Co. 72) Inventor Tsuyoshi Aso, 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture, Nissan Motor Co., Ltd. (72) Inventor Yutaro Kaneko, 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture, Nissan Motor Co., Ltd.

Claims (8)

[Claims] 1. A control device for a hybrid vehicle that supplies generated power of a generator driven by an engine to a battery and a driving motor, a vehicle speed detecting means for detecting a vehicle speed, and a rotation for detecting a rotation speed of the engine. Speed detecting means, power calculating means for calculating required power generated by the generator based on running conditions of the vehicle and the amount of charge of the battery; data of an engine speed with respect to the generated power; A rotation speed setting unit that sets an engine rotation speed outside a resonance region capable of generating the required generated power with reference to resonance data of the vehicle body; and a power generation control unit that controls the engine at the set rotation speed. A control device for a hybrid vehicle, comprising: 2. The hybrid vehicle control device according to claim 1, wherein the rotation speed setting means maintains the current engine rotation speed when the current engine rotation speed is outside a resonance region. A control device for a hybrid vehicle. 3. The control device for a hybrid vehicle according to claim 1, wherein said rotation speed setting means includes: a current engine rotation speed;
When the rotation speed required to generate the required power generated from the engine rotation speed data is within the same non-resonance region, the required rotation speed is set. Control device for hybrid vehicle. 4. The control device for a hybrid vehicle according to claim 1, wherein the rotation speed setting means includes: a current engine rotation speed;
If the rotation speed required to generate the required power generated from the engine rotation speed data is within the resonance region, a maximum rotation speed outside the resonance region lower than the required rotation speed is set. A control device for a hybrid vehicle. 5. The control device for a hybrid vehicle according to claim 1, wherein said rotation speed setting means is configured such that a current engine rotation speed is within a resonance region, and said engine rotation speed is set to a predetermined value. A control device for a hybrid vehicle, wherein the required rotation speed is set when a rotation speed required to generate the required power generated from data is outside a resonance region. 6. The control device for a hybrid vehicle according to claim 1, wherein said rotational speed setting means obtains said rotational speed data from said engine rotational speed data when the vehicle speed is higher than a predetermined speed. A control device for a hybrid vehicle, wherein a rotation speed required to generate the required generated power is set. 7. The hybrid vehicle control device according to claim 1, wherein the power generation control unit is required to generate the required power generated from the engine rotation speed data. A control device for a hybrid vehicle, wherein an output of a generator is adjusted according to a difference in rotation speed when an engine rotation speed different from the rotation speed is set. 8. The control device for a hybrid vehicle according to claim 1, wherein said engine speed data is set in consideration of a fuel consumption rate of said engine. Control device for hybrid vehicle.