JP3226290B2 - Internal combustion engine torque control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine which is generated in an internal combustion engine body or a support member or the like which uses a regular torque fluctuation generated by a steady fluctuation in output torque of each cylinder as an exciting force during operation of the internal combustion engine. The present invention relates to a torque control device for an internal combustion engine for reducing steady vibration in a roll direction.

[0002]

2. Description of the Related Art The output of a diesel internal combustion engine is regulated by the amount of fuel injected through an injection nozzle. For this reason, the control unit
Each condition, such as the engine speed, the amount of depression of the accelerator pedal, the temperature of the engine cooling water and the outside air temperature, is computed, and the injection amount is determined. However, in spite of this, when the injection nozzle has manufacturing variations, the output of each cylinder varies. Not only diesel internal combustion engine,
In general, in an internal combustion engine, when torque fluctuations caused by such variation in output between cylinders are transmitted to various devices driven by the internal combustion engine, those devices are assigned to the engine.
Forced torsional vibrations with a combustion cycle as a cycle are generated, resulting in performance degradation, equipment damage, and the like. Further, when the vehicle is equipped with the internal combustion engine, the reaction of the torque fluctuation is transmitted from the cylinder block to the mount and the chassis, and resonates with the tires so that the human being can easily perceive the internal combustion engine and the entire vehicle. It causes low frequency vibration. In order to prevent this, it is necessary to reduce the torque fluctuation due to the fluctuation of the output or to move the frequency of the torque fluctuation away from the resonance point.

On the other hand, JP-A-3-9256 according to the prior invention
Japanese Patent Application Publication No. 3 (1994) detects a combustion state of an internal combustion engine, and when it is determined that the detected combustion state is an irregular combustion state, a torque waveform corresponding to the detected combustion state is read from a torque waveform storage unit. At the same time, the torque waveform during normal combustion is also read from the torque waveform storage unit, and the absorption / generation torque of the electric machine integrally mounted on the internal combustion engine is controlled based on the comparison result of the two torque waveforms. Thus, a technique has been proposed that immediately and reliably reduces disturbance of the torque waveform generated when the internal combustion engine performs irregular combustion.

[0004]

When the method of the prior invention described above is applied to the prevention of the vibration caused by the variation in the output torque between the cylinders as described above, the method requires a large number of combustion cycles for each cylinder. Operation and memory reference are required, and the system becomes complicated.

In the case of the above-described variation in output torque, once the variation in output torque of each cylinder can be specified, the profile does not change much.
An object of the present invention is to provide a torque control device for an internal combustion engine that can cope with such a variation in output torque.

[0006]

Means for Solving the Problems In order to achieve this object,
An internal combustion engine according to the first aspect of the present invention as an independent claim.
The torque control device of the related is to apply torque to the internal combustion engine or to absorb or apply torque from the internal combustion engine,
An electromechanical both absorption is a is and is attached to an internal combustion engine integrally possible, the electric machine is generated or absorbed or generated, in the torque control system for an internal combustion engine provided with a control device for controlling the torque of absorbing , The control device
Detecting means for detecting an operating state of the internal combustion engine caused by combustion of each cylinder of the internal combustion engine; and, based on the operating state detected by the detecting means, a torque variation caused by a variation in output torque of each cylinder of the internal combustion engine. The output torque variation identification means to be specified and the output torque variation of each cylinder identified by the output torque variation identification means are shown.
Torque control waveform providing means for providing a torque control waveform that reduces vibration in the roll direction of the internal combustion engine due to torque fluctuation caused by the variation based on the information.
And torque provided from the torque control waveform providing means.
The electric machine applies to the internal combustion engine based on the control waveform.
Torque that is absorbed by or absorbed by the internal combustion engine
Torque applied to fuel engine and torque absorbed from internal combustion engine
Torque control means for controlling both magnitudes of the torque
And the torque control waveform providing means includes the torque
The control waveform is stored in advance and is stored in the internal combustion engine crank.
Read in synchronization with the clock axis rotation angle signal.
It is characterized by the following.

[0007] Similarly, in claim 2 as an independent claim,
Can the torque control device for an internal combustion engine according to the second invention be capable of applying torque to the internal combustion engine, absorbing torque from the internal combustion engine, or both applying and absorbing torque ?
One electrical machine mounted internal combustion engine integrally with, said electric machine is generated or absorbed or generated, in the torque control system for an internal combustion engine provided with a control device for controlling the torque to be absorbed, wherein the control device, an internal combustion Fuel of each cylinder of the engine
Detecting means for detecting an operating state of the internal combustion engine caused by burning, and output torque variation identifying means for identifying a torque variation caused by a variation in output torque of each cylinder of the internal combustion engine from the operating state detected by the detecting means; Based on the information indicating the variation in the output torque of each cylinder specified by the output torque variation specifying means ,
Provides a torque control waveform that reduces vibration in the roll direction of an internal combustion engine caused by torque fluctuations caused by sticking
Means for providing a torque control waveform,
Based on the torque control waveform provided by the
Torque applied to the internal combustion engine by the electric machine or internal combustion engine
Torque absorbed from the engine or torque applied to the internal combustion engine
And the amount of torque absorbed from the internal combustion engine.
Torque control means, and the torque control wave
The shape providing means stores the torque control waveform in advance and
This is synchronized with the crankshaft rotation angle signal of the internal combustion engine.
And read it out.
You.

[0008]

According to the above-described feature, the engine roll direction generated in the engine main body or the support member or the like using the regular torque fluctuation generated by the steady output torque fluctuation of each cylinder as the exciting force during the operation of the internal combustion engine. Instantaneous steady vibration
It can be surely reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to an internal combustion engine (four cylinders, four cycles) mounted on a vehicle for driving the vehicle will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a control device according to this embodiment. The present torque control device includes a crank angle sensor 1 built in a distributor, a motor generator 2 as an example of an electric machine, and an in-cylinder pressure sensor 3 that detects an in-cylinder pressure as an example of a variable indicating an operation state of the internal combustion engine. An operating state detecting unit 4 for detecting an operating state of the internal combustion engine from the cylinder pressure output from the cylinder pressure sensor 3; and an operating state of each cylinder detected by the operating state detecting unit 4 for each rotation of the internal combustion engine. The output torque variation specifying unit 5 that specifies the variation of the output torque of each cylinder by arithmetically averaging the output torque for each cylinder, and the variation of the output torque of each cylinder specified by the output torque variation specifying unit 5 On the other hand, a torque waveform storage unit 6 that stores a control torque waveform that corrects this (eliminates the influence of variations).
And a torque control unit 7 that reads a control torque waveform from the torque waveform storage unit 6 and controls the torque generated or absorbed by the motor generator 2 based on the control torque waveform. The motor generator 2 is driven by a V-belt from the internal combustion engine main body 8 and is integrally attached to the internal combustion engine main body 8.

The crank angle sensor 1 outputs two types of rotation pulses. One is that the crankshaft of the internal combustion engine is 1
Combustion cycle (720 degrees for a 4-cycle internal combustion engine, 2
One pulse is output each time the engine rotates 360 degrees. The other is that the crankshaft of the internal combustion engine rotates at a fixed small angle (usually 1 or 2 degrees, hereinafter 1 degree in this embodiment). Each time it rotates). Of these two types of rotation pulses,
If the former is used as a signal indicating the reference of the rotation angle of the crankshaft, and the latter is used as a signal for further dividing the reference angle obtained in the former, the instantaneous rotation angle of the crankshaft can be made finer ( (Every other time in this embodiment)
And it can be easily detected.

In the internal combustion engine, the rotation angle of the crankshaft in each cycle corresponds to the piston position of each cylinder on a one-to-one basis. Therefore, the instantaneous output torque for each crankshaft rotation angle can be estimated by grasping the crankshaft rotation angle and the operating state.

FIG. 2 is a diagram showing, as an example of the torque generated by the internal combustion engine, the gas torque generated by one cylinder of the four-stroke engine. One combustion cycle of a four-cycle engine, that is, four strokes of intake-compression-combustion-exhaust corresponds to 720 degrees in terms of the crankshaft rotation angle. Institution 4
If the engine is a cylinder engine and there is no variation in output torque, a torque equal to that of FIG. 2 is superposed four times at an angular interval of 720 degrees / number of cylinders, and the engine is generated within one combustion cycle. The gas torque is obtained by adding the fluctuation of the inertia torque due to the fluctuation of the rotational inertia to the gas torque, which is the torque actually generated by the engine (FIG. 3).

FIG. 4 shows the torque generated by each cylinder and the engine generated torque when the output torque of each cylinder varies in the same four-cycle four-cylinder internal combustion engine as in FIG.
In the embodiment of the present invention, in order to reduce the variation of the output torque by the torque control, the variation of the output torque of each cylinder is specified, and the torque absorbed or generated by the motor generator 2 is controlled so as to compensate for the variation. Things.

FIG. 5 shows a four-cycle four-cylinder internal combustion engine.
5 shows an example of changes in cylinder internal pressure and gas torque in one combustion cycle of a cylinder. In this example, the top dead center is reached when the crank angle is 180 degrees. As shown in FIG. 5, the internal combustion engine has a characteristic that the smaller the load, that is, the smaller the output torque, the smaller the cylinder internal pressure and the gas torque. By utilizing this characteristic, the gas torque can be calculated from the cylinder internal pressure. The easiest way to know the operating state of the internal combustion engine is to detect the cylinder pressure when the compression stroke of the internal combustion engine is completed, that is, at the top dead center. Based on this method, the operating state detection unit 4 of this embodiment
Detects the operating state of the internal combustion engine. Note that the above-described method of detecting the cylinder pressure at the top dead center is merely an example of a method of easily knowing the operating state of the internal combustion engine, and is merely an example of a method of detecting a rotational speed, an intake air amount, a cooling water temperature, an oil temperature, a transmission, and the like. By further adding and detecting other state quantities such as the gear position, it is possible to easily realize more detailed identification and detection of the operating state of the internal combustion engine.

The operation of the output torque variation specifying section 5 of this embodiment will be described with reference to FIG. The output torque variation specifying unit 5 outputs the output torque variation during 2 m rotation of the crankshaft (m is a certain integer).
The operating state P [i, input from the operating state detector 4
j] (i = 1 to 4: corresponding to the cylinder number, j: the number of revolutions. That is, in this example, P [i, j] represents the cylinder pressure at the top dead center of the i-th cylinder in the j-th revolution. ) Is detected and 2
The arithmetic mean _Pm [i] (i = 1 to 1) of the operating state of each cylinder is obtained using the above detected value P [i, j] obtained over m rotations.
4: corresponding to the cylinder number). Then the average T _m of a combustion time of the effective output torque of each cylinder from the average of the operating condition
[I] (i = 1 to 4: corresponding to the cylinder number) is calculated. Further, the reference _Tr for equalizing the varied torque is determined based on the respective operating conditions, the required fuel consumption rate, the power consumption rate of the power source (battery) for driving the motor generator, and the like. And
_Tr and average _Tm [i] of effective output torque during combustion of each cylinder
(I = 1 to 4: corresponding to the cylinder number) _Td [i]
(I = 1 to 4: corresponding to the cylinder number). Thus, the variation in the output torque of each cylinder is specified.

The torque waveform storage unit 6 stores a function of the crankshaft rotation angle θ expressed in units of 1 degree, which is the minimum rotation angle of the crankshaft that can be detected by the crank angle sensor 1 according to each operation state. The control torque waveform T [θ] that cancels the variation of the output torque specified by the output torque variation specifying unit 5 is stored. The torque waveform storage unit 6 outputs the stored control torque waveform in synchronization with the rotation pulse output every one degree from the crank angle sensor 1, so that the internal combustion engine generates the control torque waveform at each rotation angle of the crankshaft. The control torque waveform corresponding to the generated torque waveform can be faithfully reproduced (FIG. 7). The torque waveform storage unit 6 according to the present embodiment stores a control torque waveform that cancels the variation of the output torque specified by the output torque variation specifying unit 5 according to each operating state.
Is stored for each degree, which is the minimum rotation angle of the crankshaft that can be detected by the above. If the resolution for the rotation angle of the crankshaft is not so required, the interval between the stored rotation angles of the crankshaft is increased. At the same time, the rotation pulse output from the crank angle sensor 1 every one degree may be divided until it matches the interval of the stored rotation angle, and the frequency may be used as a synchronization signal for outputting the stored control torque waveform. .

Next, a second embodiment will be described. In the first embodiment, the torque waveform storage unit 6 detects, by the crank angle sensor 1, a control torque waveform that cancels the variation in the output torque specified by the variation determining unit 5 in accordance with each operating state. Although it is stored for each degree, which is the minimum rotation angle of the crankshaft that can be obtained,
In the second embodiment, the torque waveform has the output torque variation T _d of each cylinder specified by the output torque variation specifying unit 5.
[I] (i = 1~4: corresponding to the cylinder number), an embodiment in which can be expressed as a function f _n of the rotation angle θ of the crankshaft, in this case, the torque waveform storage section 6 ,
It is not necessary to store the control torque waveform for each degree, which is the minimum rotation angle of the crankshaft that can be detected by the crank angle sensor 1, and the output torque variation T _d [i] of the function f _n representing the control torque waveform , the coefficient K ₁ according to the rotation angle θ of the crankshaft, ... need only store the K _n. Then, using these coefficients, the control torque waveform T [θ] = f _n (K ₁ ,..., K _n ,
T _d , θ) (FIG. 8), and when this value is output in synchronization with the rotation pulse output from the crank angle sensor 1 every one degree, as in the case shown in FIG. Can faithfully reproduce a control torque waveform corresponding to a torque waveform generated at each rotation angle of the crankshaft.

The difference between the case shown in FIG. 7 (first embodiment) and the case shown in FIG. 8 (second embodiment) is as follows. That is, in the case of FIG. 7, since the control torque waveform is all stored in advance for each rotation angle of the crankshaft, the torque waveform storage unit 6 does not need to perform any operation, but stores the control torque waveform. This requires a lot of storage capacity. On the other hand, in the case of FIG. 8, since only coefficients for defining the function representing the control torque waveform are stored, the storage capacity can be reduced, but the control torque waveform is calculated using these coefficients. Therefore, the torque waveform storage unit 6 needs to perform some calculations. Therefore, which of the method shown in FIG. 7 and the method shown in FIG.

FIG. 9 is a diagram showing an example of a torque waveform when there is no variation in the output torque of each cylinder of the internal combustion engine.
0 is a diagram showing an example of engine roll direction vibration when the output torque of each cylinder of the internal combustion engine does not vary, FIG.
FIG. 12 is a diagram illustrating an example of a torque waveform when the output torque of each cylinder of the internal combustion engine varies, and FIG. 12 is an example of an engine roll direction vibration when the output torque of each cylinder of the internal combustion engine varies. FIG. FIG. 13, FIG.
Is calculated by the torque waveform storage unit 6 in the first embodiment or calculated by the torque waveform storage unit 6 in the second embodiment with respect to the torque fluctuation as shown in FIG. 11 generated by the internal combustion engine. FIG. 4 is a diagram showing an example of a control torque waveform. The following torque control is performed based on this torque waveform.

When the control torque waveform is positive based on the control torque waveform read out or calculated from the torque waveform storage unit 6, the torque control unit 7
Is operated as a generator, and conversely, when the control torque waveform is negative, the motor generator 2 is operated as a motor.
The torque waveform generated by the entire internal combustion engine (including the motor generator 2) when such torque control is performed is shown in FIG.
This is a combination of the torque waveform shown in FIG. 1 and the torque waveform shown in FIG. FIG. 15 shows a torque waveform as a result of this torque control.

By performing such torque control, FIG.
As described above, it is possible to easily and accurately remove only the torque fluctuation that occurs when the output torque of the internal combustion engine varies. FIG. 16 shows an engine roll direction vibration waveform at this time.

When the fluctuation component of the torque generated by the internal combustion engine is dominant in the fluctuation component having a frequency synchronized with the combustion stroke of the internal combustion engine, the torque waveform storage in the first embodiment or the second embodiment is performed. The control torque waveform stored or calculated by the section 6 is replaced with a sine wave or a square wave having a frequency synchronized with the combustion stroke of the internal combustion engine instead of the waveforms shown in FIGS. 7, 8, 13 and 14. As a part, the same effect of torque control as described above can be obtained. Here, the combustion stroke of the internal combustion engine is one combustion cycle of the internal combustion engine (converted to the rotation angle of the crankshaft,
(E.g., 720 degrees in the case of a four-cycle internal combustion engine, 360 degrees in the case of a two-cycle internal combustion engine), the same number of times as the number of cylinders of the internal combustion engine appears. Is a sine wave or a rectangular wave having one cycle of a value obtained by dividing one combustion cycle of the internal combustion engine by the number of cylinders (the rotation angle of the crankshaft). In the torque control device for an internal combustion engine to which the above concept is applied, two examples of the control torque waveform stored in the torque waveform storage unit 6 with respect to the torque fluctuation generated by the internal combustion engine as shown in FIG. These are shown in FIGS.

Next, as another embodiment of the present invention, a torque waveform calculating section 9 is provided instead of the torque waveform storing section 6, and the torque waveform calculating section 9 performs one combustion cycle (crankshaft) of the internal combustion engine. Is converted into a rotation angle of 720 degrees in the case of a four-cycle internal combustion engine, and 360 degrees in the case of a two-cycle internal combustion engine). An embodiment will be described in which a control torque waveform for canceling a torque fluctuation due to a variation in the generated output torque is calculated. FIG.
An example in which such a control torque is calculated in the form of a sine wave with one combustion cycle of the internal combustion engine as one cycle will be described. FIG. 19 (a)
Is a variation of the output torque of each cylinder in the form of a periodic function having one cycle as one combustion cycle of the internal combustion engine identified by the output torque variation identification unit 5. This is shown in FIG.
Thus, for each cylinder, a frequency component having one combustion cycle as one cycle can be decomposed into a dominant periodic function. Further, when only the fundamental frequency component is extracted from such a periodic function, a sine wave having an amplitude and a phase as shown in FIG. 19C is obtained. The amplitude of this sine wave is shown in FIG.
Although the output torque is proportional to the magnitude of the variation of the output torque in FIG. 9B, the phase does not change. By adding the four sine waves of FIG. 19C, it is possible to extract a sine wave of only a frequency component having one cycle as one combustion cycle of the waveform as shown in FIG. 19 (d)). When such a method is used, the control torque waveform as a sine wave of only a frequency component having one combustion cycle as one cycle is subjected to a complex order analysis (Fourier analysis) with respect to the variation of the output torque as shown in FIG. Calculation can be performed without performing series expansion, etc.), and the amount of calculation can be greatly reduced.

If the comparator 10 is further used as shown in FIG. 20, a control torque waveform as a rectangular wave as shown in the right side of FIG. 21 can be obtained. The comparison level of the comparator 10 is shown in FIG.
By changing as in (b) and (c), the duty ratio can be changed while the peak value of the torque control command is kept constant.

The torque control section 7 has a sine-wave control torque waveform as shown in FIG. 19D or a rectangular-wave control torque waveform as shown on the right side of FIG. 21 calculated by the torque waveform calculation section 9 as described above. When the control torque waveform is positive, the motor generator 2 is operated as a generator, and when the control torque waveform is negative, the motor generator 2 is operated as a motor.

FIG. 22 shows a motor generator 2 based on a sinusoidal control torque waveform with respect to the torque fluctuation as shown in FIG.
Is a diagram showing a torque waveform that is absorbed and generated. The torque waveform generated by the entire internal combustion engine (including the motor generator 2) when such torque control is performed is a combination of the torque waveform shown in FIG. 11 and the torque waveform shown in FIG. Becomes FIG. 23 shows a torque waveform as a result of this torque control. By performing the above-described torque control, as shown in FIG. 23, it is possible to easily and accurately remove only the torque fluctuation that occurs when the output torque of the internal combustion engine varies. FIG. 24 shows a vibration waveform in the engine roll direction at this time.

FIG. 25 shows an example of the configuration of the torque control unit 7 in each of the above embodiments. The three-phase motor generator 11 is used as the electric machine 2, and the torque control unit 7 includes the three-phase inverter 12. An example using the three-phase converter 13 will be described. The three-phase inverter 12 and the three-phase converter 13 are connected to the three-phase motor generator 11 via a power line in parallel with each other.
Also, D of the three-phase inverter 12 and the three-phase converter 13
The C side is connected to the battery 15 in parallel with each other. When the control torque waveform is negative based on the control torque waveform read from the torque waveform storage unit 6 or calculated by the torque waveform calculation unit 9 with respect to the torque waveform generated by the internal combustion engine, Is smaller than the average, an electric command is issued to the three-phase inverter 12, and the three-phase motor generator 11 is operated as a three-phase motor using the electric energy of the battery 15, and conversely, the control torque waveform is changed. When positive, that is, when the torque generated by the internal combustion engine is greater than the average, a power generation command is issued to the three-phase converter 13 to operate the three-phase motor generator 11 as a three-phase generator. The electric energy generated at this time is stored in the battery 15.

FIG. 26 shows an example in which only the three-phase inverter is used without using the three-phase converter in FIG. An inverter 12 is formed using power switching elements, and a surge absorbing diode is provided in the inverter 12 in parallel with each power switching element as is known in order to absorb a surge voltage generated by switching of the power switching elements. Have been. This surge-absorbing diode forms a Greez connection like a converter. When the motor generator 11 is operated as a generator, the three-phase converter 13 in the example of FIG.
Can be omitted.

Although the three-phase motor generator, the three-phase inverter, and the three-phase converter are used in the examples shown in FIGS. 25 and 26, the present invention can be applied to any single-phase or multi-phase converter. Needless to say, we can do it.

In each of the above-described embodiments of the present invention, a case has been described in which a motor generator is used as an electric machine capable of both generating and absorbing torque.
Applying torque to the internal combustion engine is equivalent to reducing the load torque of the internal combustion engine, and absorbing torque from the internal combustion engine is nothing less than reducing the torque applied to the internal combustion engine. Therefore, it goes without saying that the present invention can be applied as it is even if torque control is performed using a motor or a generator, or using a motor and a generator simultaneously.

Next, the operation period of the output torque variation specifying means of the torque control device will be described with reference to FIG. At the time of starting the torque control device, first, the output torque variation means is operated, and stops when the variation of the output torque of the target internal combustion engine is specified. Then, torque control is performed according to the specified variation. Thereafter, when the operating condition of the output torque variation specifying means is satisfied, such as when the operation state of the internal combustion engine changes from a certain set state, or when a certain time has elapsed since the output torque variation specifying means stopped, Then, the output torque variation specifying means is operated again. The output torque variation specifying means is operated in such a flow.

When the internal combustion engine is stopped, the internal combustion engine torque control device is also stopped. Thereby, the electric power is not supplied to the motor generator 2 when the internal combustion engine is stopped, so that the motor generator 2 is prevented from being damaged.

[0034]

According to the present invention, the operating state of the internal combustion engine is detected, the tendency of the variation in the output torque of each cylinder is specified based on the degree of the operation, and the engine is integrally mounted on the internal combustion engine based on the information. Since the magnitude of both the torque applied to the internal combustion engine by the electric machine or the torque absorbed from the internal combustion engine or both the torque applied to the internal combustion engine and the torque absorbed from the internal combustion engine is controlled, the output torque between the cylinders of the internal combustion engine is reduced. Distortion of the torque waveform generated due to the variation can be immediately and reliably reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a control device according to a first embodiment of the present invention,

FIG. 2 is a diagram showing an example of a torque waveform generated by an internal combustion engine;

FIG. 3 is a diagram showing an example of a torque waveform generated by an internal combustion engine;

FIG. 4 is a diagram showing an example of a torque waveform generated by the internal combustion engine;

FIG. 5 is a diagram showing an example of changes in cylinder internal pressure and gas torque in one combustion cycle of one cylinder of an internal combustion engine;

FIG. 6 is a diagram showing an operation of an output torque variation specifying unit 5;

FIG. 7 is a diagram showing an operation when the torque waveform storage unit 6 stores a control torque waveform itself;

FIG. 8 is a diagram showing an operation when the torque waveform storage unit 6 stores a coefficient of a function representing a control torque waveform;

FIG. 9 is a diagram showing an example of a torque waveform generated when the internal combustion engine is performing normal combustion;

FIG. 10 is a diagram showing a vibration waveform in an engine roll direction during normal combustion.

FIG. 11 is a diagram showing an example of a torque waveform generated when the output torque of the internal combustion engine varies.

FIG. 12 is a diagram showing a vibration waveform in an engine roll direction when a variation occurs in output torque;

FIG. 13 is a diagram showing an example of a torque control command waveform output by a torque waveform storage unit 6 when the internal combustion engine is generating a torque as shown in FIG. 11;

FIG. 14 is a diagram showing an example of a control torque waveform output by a torque waveform storage unit 6 when the internal combustion engine is generating torque as shown in FIG. 11;

FIG. 15 is a diagram showing an example of a torque waveform generated by the internal combustion engine when performing torque control;

FIG. 16 is a diagram showing a vibration waveform in an engine roll direction when torque control is performed.

FIG. 17 is a diagram showing a case where a rectangular wave having a frequency synchronized with a combustion stroke of an internal combustion engine is used as a control waveform;

FIG. 18 is a diagram showing a case where a sine wave having a frequency synchronized with a combustion stroke of an internal combustion engine is used as a control waveform;

FIG. 19 shows another embodiment of the present invention, in which a torque waveform calculator 9 is provided in place of the torque waveform storage 6, and a cycle in which a frequency component having one combustion cycle of the internal combustion engine as one cycle is dominant. The figure showing the case of calculating the control torque corresponding to the torque fluctuation generated by the engine in the form of a function,

FIG. 20 illustrates a comparator.

FIG. 21 is a diagram illustrating an example in which a control torque waveform is extracted as a rectangular wave.

FIG. 22 is a view showing a torque waveform generated and absorbed by the motor generator 2 with respect to the torque fluctuation as shown in FIG. 11 in the other embodiment of the present invention;

FIG. 23 is a diagram showing an engine torque waveform at the time of the torque control.

FIG. 24 is a view showing a vibration waveform in the engine roll direction at the time of the above.

FIG. 25 is a diagram illustrating a case where a three-phase motor generator is used as an electric machine and a three-phase inverter and a three-phase converter are used as a torque control unit in each embodiment of the present invention.

FIG. 26 is a diagram showing a case where the three-phase converter is omitted from the example of FIG. 25;

FIG. 27 is an explanatory diagram of an operation period of an output torque variation specifying unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Crank angle sensor 2 ... Motor generator as an example of an electric machine 3 ... Cylinder pressure sensor 4 ... Operating state detecting unit 5 ... Output torque variation specifying unit 6 ... Torque waveform storage unit 7 ... Torque control unit 8 ... Internal combustion engine body 9 ... Torque waveform calculator 10 ... Comparator 11 ... Three-phase motor generator 12 ... Three-phase inverter 13 ... Three-phase converter 14 ... Torque controller 15 ... Battery

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI F02D 45/00 368 F02D 45/00 368S 370 370B 376 376H (72) Inventor Youzo Nakamura 2520 No. Oji Takaba, Katsuta-shi, Ibaraki Pref. (72) Inventor, Yuji Maeda 2520, Oji, Takaba, Katsuta-shi, Ibaraki, Japan In-house Hitachi, Ltd. Inside plant (72) Inventor Masao Fukushima Nissan Motor Co., Ltd., 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture (72) Inventor Kei Murakami Nissan Motor Co., Ltd. 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture (56) References Special JP-A-2-146977 (JP, A) JP-A-3-36981 (JP, A) JP-A-3-92563 (JP A) Patent flat 3-57792 (JP, A) (58 ) investigated the field (Int.Cl. ^7, DB name) H02P 5/00 F02B 75/06 F02D 29/06 F02D 45/00

Claims (15)

(57) [Claims] An electric machine capable of applying torque to an internal combustion engine, absorbing torque from the internal combustion engine, or both applying and absorbing torque, and integrally mounted with the internal combustion engine; A control device for controlling the generated or absorbed or the generated and absorbed torque, wherein the control device detects an operating state of the internal combustion engine caused by combustion of each cylinder of the internal combustion engine. Means, output torque variation identification means for identifying a torque variation caused by variation in the output torque of each cylinder of the internal combustion engine from the operating state detected by the detection means, and each cylinder identified by the output torque variation identification means The internal combustion engine roll caused by torque fluctuations caused by the fluctuations based on information indicating the fluctuations in the output torque of the internal combustion engine Torque control waveform providing means for providing a torque control waveform that reduces vibration in the direction, and torque or internal combustion applied to the internal combustion engine by the electric machine based on the torque control waveform provided from the torque control waveform providing means. Torque control means for controlling the magnitude of both the torque absorbed from the engine or the torque applied to the internal combustion engine and the torque absorbed from the internal combustion engine , wherein the torque control waveform providing means comprises:
The torque control waveform described above is stored in advance, and is stored in the internal combustion engine.
Read in synchronization with the Seki crankshaft rotation angle signal.
The torque control device for an internal combustion engine, characterized in that there I. 2. Applying torque to an internal combustion engine or internal combustion
Absorption of torque from the engine or both application and absorption of torque
Is possible and integrated with the internal combustion engine
An electrical machine and the electrical machine generates or absorbs or generates
Internal combustion provided with a control device for controlling the generated and absorbed torque
In the torque control device for an engine, the control device is configured to control an internal combustion engine caused by combustion in each cylinder of the internal combustion engine.
Detecting means for detecting an operating state of a fuel engine; and the detecting means
From the operating state detected by the
Identify torque fluctuations caused by force torque variations
Output torque variation specifying means, and the output torque
Of the output torque of each cylinder specified by the
Based on the information indicating the fluctuation,
Vibration in the roll direction of the internal combustion engine due to torque fluctuations
Torque control wave that provides a depressing torque control waveform
Shape providing means and the torque control waveform providing means.
Re that based on the torque control waveform, the electric machine is an internal combustion engine
Torque applied to the engine or torque absorbed from the internal combustion engine
Torque applied to the internal combustion engine or
Torque control means for controlling both magnitudes of torque to be taken
Wherein the torque control waveform providing means comprises:
The torque control waveform is output to the output torque variation specifying means.
More specific information indicating the variation and the internal combustion engine
Store the coefficient of the function expressed by the rank axis rotation angle signal
From the coefficient and the output torque variation specifying means.
From the above information and the crankshaft rotation angle signal, the torque control is performed.
A torque control device for an internal combustion engine, wherein a control waveform is calculated . 3. The output torque variation specifying means includes:
Output of each cylinder according to crankshaft rotation angle signal of fuel engine
Outputs a periodic waveform representing torque variation,
The torque control waveform providing means is an output torque variation specifying means.
Calculates the torque control waveform based on the waveform output by
2. The method according to claim 1 , further comprising a calculating means for outputting the data.
3. The torque control device for an internal combustion engine according to 2 . 4. The engine according to claim 1, wherein each of the operating states includes an explosion of each cylinder of the internal combustion engine.
A cylinder pressure at the time of expansion ;
4. The torque control device for an internal combustion engine according to 2 or 3 . 5. The engine according to claim 1, wherein the operating state is determined based on each cylinder of the internal combustion engine.
5. The torque control device for an internal combustion engine according to claim 4 , wherein the pressure is an in- cylinder pressure at a dead center . 6. The torque control waveform according to each operation of an internal combustion engine.
Torque generated by output torque variation in the state
The torque control device for an internal combustion engine according to claim 1, 2 or 3, wherein the torque control device has a torque waveform corresponding to torque fluctuation . 7. The output torque variation specifying means includes:
One combustion cycle of the fuel engine (converted to the rotation angle of the crankshaft)
Then, in the case of a 4-cycle internal combustion engine, 720 degrees and 2 cycles
(In the case of an internal combustion engine, 360 degrees)
It specifies the torque fluctuation generated by the internal combustion engine in the form
The torque control device for an internal combustion engine according to claim 1, 2, or 3, wherein 8. The fuel control system according to claim 1, wherein the torque control waveform is one
The firing cycle (converted to a crankshaft rotation angle of 4 sa
In the case of a cycle internal combustion engine,
Part or all of the sine wave with one cycle of 360 degrees)
The torque control device for an internal combustion engine according to claim 1, 2 or 3, wherein it is a part. 9. The torque control waveform is defined as one cycle of one combustion cycle of the internal combustion engine (720 degrees in the case of a four-cycle internal combustion engine when converted into a rotation angle of a crankshaft) of 360 degrees in the case of a two-cycle internal combustion engine. 4. The torque control device for an internal combustion engine according to claim 1, wherein the torque control device is a part or all of a rectangular wave . 10. The torque control waveform according to claim 1, wherein
Combustion cycle (converted to the rotation angle of the crankshaft, 4
And wherein the cycle if 720 degrees of the internal combustion engine, when 360 degree two-cycle internal combustion engine) which is a part or all of a sine wave in which one cycle divided by the number of cylinders of the internal combustion engine
4. The torque control device for an internal combustion engine according to claim 1, 2 or 3 . 11. The torque control waveform according to claim 1, wherein:
Combustion cycle (converted to the rotation angle of the crankshaft, 4
And wherein the cycle if 720 degrees of the internal combustion engine, when 360 degree two-cycle internal combustion engine) which is a part or the whole of the rectangular wave as one cycle divided by the number of cylinders of the internal combustion engine
4. The torque control device for an internal combustion engine according to claim 1, 2 or 3 . 12. The method according to claim 12, wherein the torque control waveform is the output torque.
Of the output torque of each cylinder identified by the
The amplitude of the torque fluctuation caused by the fluctuation
The amplitude or duty ratio of the torque control waveform, or
Is the torque control wave with both amplitude and duty ratio changed
The torque control device for an internal combustion engine according to claim 9 or 11, wherein the torque control device is of a shape . 13. The output torque sensor according to claim 11, wherein
During the period in which the variance identification means operates, the output torque variation
Is determined by the variation in the output torque of each cylinder.
Until the torque fluctuation generated by the internal combustion engine is specified.
The torque control device for an internal combustion engine according to claim 1, 2 or 3, wherein 14. An internal combustion engine in a state in which said detecting means and said output torque variation specifying means are not operating.
If the operating state of the Seki changes from a certain range,
Detecting means and output torque variation specifying means,
The output torque variation identification means determines the output torque of each cylinder.
Identify torque fluctuations generated by internal combustion engines due to variations
14. The torque control device for an internal combustion engine according to claim 13 , wherein the torque control device is operated until the operation is completed . 15. The state said detecting means and said output torque variation identifying means is not operating, when there
When the time has elapsed, the detecting means and the output
The torque variation identification means, the output torque variation identification
Means for controlling the internal combustion engine by the variation of the output torque of each cylinder
To operate until the torque fluctuation that causes
14. The torque control device for an internal combustion engine according to claim 13, wherein: