JPH0759269A - Controller for charging generator - Google Patents

Abstract

PURPOSE:To control the battery terminal voltage constantly depending on the charged state regardless of the variation in the electric load through feedback control for determining a target generating current depending on the throw-in state and interrupted state of electric load or adaptive control for varying the feedback gain. CONSTITUTION:The charging generator controller comprises an AC three-phase generator 1, and an adder 52 outputting a battery voltage difference DELTAV, i.e., the difference between a target battery terminal voltage Vr predetermined based on the operating condition and the terminal voltage VB actually detected from a battery 3. The charging generator controller further comprises means 3 for controlling the current flowing through the field coil of the generator 1 depending on the battery voltage difference DELTAV such that the generator 1 generates a constant output current, and means 55 for correcting the control operation value of the control means 53 depending on the battery voltage difference DELTAV.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention is equipped in a vehicle or the like,
The present invention relates to a charging generator control device that controls an output current of a charging generator driven by an internal combustion engine.

[0002]

2. Description of the Related Art FIG. 20 shows, for example, JP-A-61-153535.
It is a block diagram which shows the conventional charging generator control device shown by the 5th publication. In the figure, reference numeral 1 is a three-phase AC generator driven by an internal combustion engine (not shown). The three-phase AC generator 1 has an armature coil 1a and a field coil 1b which are three-phase star-connected. . 2 is a full-wave rectifier for full-wave rectifying the AC output of the three-phase AC generator 1, 3 is a battery connected in parallel between the rectification output terminal 2a and the ground terminal 2b of the full-wave rectifier 2, and 4 is an electric load group. The electric load group 4 is composed of loads 42a to 42n connected in parallel to the battery 3 via switches 41a to 41n.

Reference numeral 5 denotes an internal combustion engine electronic control unit (hereinafter referred to as an ECU) which is composed of a microcomputer. The ECU 5 has a function of controlling the output voltage of the three-phase AC generator 1 to a predetermined value, and the internal combustion engine. It has a known function of controlling the fuel amount of the engine, the ignition timing, and the like. It should be noted that the ECU 5 is a battery that is a voltage deviation between a battery terminal voltage V _B detected by the voltage detection terminal 3 a of the battery 3 and a target battery terminal voltage Vr set based on vehicle engine information output from various sensors described later. The field coil 1b is driven and controlled based on the voltage deviation ΔV.

As the above-mentioned various sensors, an air flow sensor 6 for measuring the air taken in by the internal combustion engine, a crank angle sensor 7 for detecting the rotational speed (hereinafter referred to as Ne) of the internal combustion engine and for discriminating the present cylinder. There are a vehicle speed sensor 8 for detecting the speed of the vehicle, a water temperature sensor 9 for detecting the temperature of the cooling water of the internal combustion engine, and an intake air temperature sensor 10 for detecting the temperature of the air taken in by the internal combustion engine.

Further, the electric load group 4 includes not-shown vehicle headlights, rear defogger, power window, etc., but may also include an air flow sensor 6 and a crank angle sensor 7.

FIG. 21 is a block diagram showing the functional structure of the ECU 5. In the figure, the same reference numerals as those in FIG. 20 indicate the same or corresponding portions. In the figure, reference numeral 51 sets a target battery terminal voltage Vr for optimally charging the battery 3 based on the engine information by the air flow sensor 6, the crank angle sensor 7, the vehicle speed sensor 8, the water temperature sensor 9, and the intake air temperature sensor 10. The target voltage setting means, 52 is an adder for calculating the battery voltage deviation ΔV from the target battery terminal voltage Vr set by the target voltage setting means and the battery terminal voltage V _B detected by the battery 3, and 53 is the calculated battery voltage. Target power generation current Ia based on the deviation ΔV
Control means 54 for calculating the calculated target generated current I
2 of a and Ne detected by the crank angle sensor 7
A current control value (field current) If of the field coil 1b is determined by a table-up from the dimension map, and the current control value If is determined.
Drive duty x of the field coil 1b determined for
Is an Ia / If conversion means for obtaining by a table lookup.

Next, the operation of the conventional charging generator control device will be described with reference to the flowchart of FIG. First, in step S1, the ECU 5 reads the output signals from the air flow sensor 6, the crank angle sensor 7, the vehicle speed sensor 8, the water temperature sensor 9, and the intake air temperature sensor 10 into a RAM (not shown) as the engine state of the vehicle. Next, in step S2, the value of the battery terminal voltage V _B is also read from the voltage detection terminal 3a of the battery 3 into the RAM.

After reading the engine state and the terminal voltage V _B , the target voltage setting means 51 determines the target battery terminal voltage Vr for optimal charging of the battery 3 in step S3. When the target battery terminal voltage Vr is determined, in step S4, the battery voltage deviation ΔV (= V) which is the deviation between the battery terminal voltage V _B read in the RAM in step S2 and the target battery terminal voltage Vr.
r-V _B ) is calculated by the adder 52. Next, the control means 5
3 is a step S5 in which the battery voltage deviation ΔV is set to P.P. I. Target calculation current Ia
Is calculated.

[0009]

In the above (1), kp is the proportional term ki is the integral term k _D shows a differential term ΔV is the battery voltage deviation.

The above P. I. If the target generated current Ia is calculated as a result of the D calculation, Ia / If is calculated in step S6.
In the conversion means 54, the field coil 1b is first searched by a table lookup from a two-dimensional map (not shown) of the target generated current Ia and Ne input from the crank angle sensor 7.
Current control value If is determined.

Further, in step S7, the Ia / If conversion means 54 determines a predetermined drive duty x of the field coil 1b for the current control value If by table lookup. Then, in step S8, the ECU 5 sets the drive duty x to the field coil drive circuit (not shown) from the field coil drive terminal 5a.

As a result, the field coil drive circuit sets the drive duty x and the predetermined frequency (for example, 200H).
z), a duty output signal having a duty waveform, that is, a field current having a predetermined duty ratio.
To drive. When the field coil 1b rotates with the start of an engine (not shown), a three-phase AC voltage proportional to the magnitude of the field current is generated across the armature coil 1a. The three-phase AC voltage is converted into a DC voltage by the full-wave rectifier 2 and then applied between the + electrode and the-electrode of the battery 3 through the rectification output terminal 2a and the ground terminal 2b to charge the battery 3.

When the field current If is supplied to the field coil 1b by the charging voltage of the battery 3, a three-phase AC voltage is generated across the armature coil 1a as the engine rotates. Then, this three-phase AC voltage is converted into a DC voltage (battery terminal voltage V _B ) by the full-wave rectifier 2 and charged in the battery 3. After that, a voltage is supplied from the battery 3 to the electric load group 4.

[0015]

Since the conventional charging / generator control device is configured as described above, the battery terminal voltage V _B deviates from the target battery terminal voltage Vr when various electric loads are applied, and the battery is thus controlled. When the voltage deviation ΔV occurs, the battery state changes due to the interruption of the electric load corresponding to the positive of ΔV or the turning on of the electric load corresponding to the negative of the ΔV, but the characteristics of the charging system including the battery to be controlled changes. However, since a constant feedback gain is used regardless of the positive / negative of ΔV, there is a problem in that the voltage control accuracy is reduced and the brightness of the vehicle-mounted light flickers.

Further, since the feedback control is performed regardless of the magnitude of the battery voltage deviation ΔV, the control system becomes unstable in response to a malfunction due to electric noise or the like, or an electric load being turned on or off, which makes the control system unstable. There was also the problem of voltage oscillation.

Further, in the conventional three-phase AC generator,
The field current If that should flow to the field coil is the target generated current Ia
Then, the duty ratio x for driving the field coil with respect to the field current If was set as the field current If after the table lookup was determined by a predetermined two-dimensional map with respect to the engine speed Ne. Since it was determined by the table lookup with the duty ratio x, the characteristics of the three-phase AC generator, the operating state, or the target battery terminal voltage V
There is a problem that the generator output current cannot be accurately controlled when r changes. The present invention has been made to solve the above problems, and provides a feedback control method for detecting the turning on / off of an electric load and determining the target generated current according to the turning on / off of the electric load. In addition to being able to perform variable control and variable feedback gain adaptive control, it is possible to shorten the time for the output terminal voltage of the charging system including the battery to exceed the target battery terminal voltage when the electrical load is cut off. It is therefore an object of the present invention to provide a charging generator control device capable of controlling so that the battery terminal voltage is always constant according to the state of charge regardless of changes in electric load.

Further, according to the present invention, the drive duty ratio x of the field coil can be set so that the output current value of the three-phase AC generator can be accurately controlled, and as a result, the battery terminal voltage is set to the target battery terminal voltage. An object of the present invention is to obtain a charging generator control device that can

[0019]

A charging generator control device according to a first aspect of the present invention detects a state of a generator driven by an internal combustion engine and a charging system charged by a current output of the generator. Charge state detection means, operation state detection means for detecting the operation state of the internal combustion engine, target charge voltage set based on the operation state detected by the operation state detection means, and detected by the charge state detection means Control means for controlling the field current flowing in the field coil of the generator so that the output current of the generator becomes a predetermined value according to the deviation from the charging voltage, and the control means of the control means according to the deviation. And a correction means for correcting and controlling the control calculation value.

According to a second aspect of the present invention, there is provided a charging generator control device, which comprises a generator driven by an internal combustion engine, and a charge state detecting means for detecting a state of a charging system charged by a current output of the generator. An operating state detecting means for detecting an operating state of the internal combustion engine, and a deviation between a target charging voltage set based on the operating state detected by the operating state detecting means and a charging voltage detected by the charging state detecting means. According to the control means for controlling the field current flowing through the field coil of the generator so that the output current of the generator becomes a predetermined value, and whether the absolute value of the deviation exceeds a predetermined value And a correction unit that corrects and controls the control calculation value of the control unit according to the determination result.

A charging generator control device according to a third aspect of the present invention includes a generator driven by an internal combustion engine, and a charging state detecting means for detecting a state of a charging system charged by a current output of the generator. An operating state detecting means for detecting an operating state of the internal combustion engine, and a deviation between a target charging voltage predetermined based on the operating state detected by the operating state detecting means and a charging state detected by the charging state detecting means. The field current flowing through the field coil of the generator is set to a predetermined value so that the output current of the generator becomes a predetermined value.
Control means for performing D control, determination means for determining whether or not the charge state detection value detected by the charge state detection means exceeds a target charge voltage, and integration of PID control by the control means according to the determination result. And a correction means for correcting and controlling the value to zero.

According to a fourth aspect of the present invention, there is provided a charging generator control device comprising: a generator driven by an internal combustion engine; and a charging voltage detecting means for detecting a charging voltage of a charging system charged by a current output of the generator. A current adjusting means for adjusting a target output current of the generator based on a voltage detected by the charging voltage detecting means, a rotation speed detecting means for detecting a driving rotation speed of the generator, and a target output by the current adjusting means. Field coil current control means for controlling the field current flowing to the field coil of the generator according to the current and the rotation speed driven by the rotation detection means.

A charging generator control device according to a fifth aspect of the present invention includes a generator driven by an internal combustion engine, and a charging voltage detecting means for detecting a charging voltage of a charging system charged by a current output of the generator. , A current adjusting means for adjusting a target output current of the generator based on a voltage detected by the charging voltage detecting means, a rotation speed detecting means for detecting a driving rotation speed of the AC generator, and an operation of the AC generator The operating temperature detecting means for detecting the temperature, the field coil current correcting means for correcting the field current flowing through the field coil of the generator based on the operating temperature detected by the temperature detecting means, and the current adjusting means. A field current flowing through the field coil of the generator according to the target output current, the drive rotation speed by the rotation detection means, and the field current correction value by the field coil current correction means. Gosuru and a field coil current control means.

According to a sixth aspect of the present invention, there is provided a charging generator control device, which comprises a generator driven by an internal combustion engine, and a charging voltage detecting means for detecting a charging voltage of a charging system charged by a current output of the generator. , A target value output means for outputting a target output current value of the generator on the basis of the voltage detected by the charging voltage detecting means and a target output voltage value, and a target output voltage output by the target value output means Field coil current correction means for correcting the field current flowing in the field coil of the generator based on the value, rotation speed detection means for detecting the drive rotation speed of the generator, and target by the target value output means A field coil for controlling the field current flowing through the field coil of the generator according to the output current, the field current correction value by the field coil current correction means, and the drive rotation speed by the rotation detection means. And a current control unit.

[0025]

In the charging generator control device according to the invention of claim 1, the absolute value of the deviation between the target charging voltage predetermined according to the operating condition and the charging condition detected by the charging condition detecting means exceeds a predetermined value. It is determined by the determining means whether or not the correction is performed, and the correcting means optimally corrects the control calculation value of the control means that controls the field current flowing in the field coil of the generator according to the determination result. A stable charging operation can be performed.

According to another aspect of the present invention, there is provided a charging generator control device, wherein the generator generator field is determined according to a deviation between a target charging voltage predetermined according to an operating condition and a charging condition detected by the charging condition detecting means. By optimally correcting the control calculation value of the control means for controlling the field current flowing in the magnetic coil by the correction means, it is possible to perform a stable charging operation regardless of a minute change in the deviation.

In the charging generator control device according to the invention of claim 3, the field current is detected if the determination means determines that the detected charge state value exceeds the target charge voltage detected by the charge state detection means. By resetting the integral term by the control means for PID control to 0, the time for which the charging voltage exceeds the target charging voltage can be shortened.

In the charging and power generation control device according to the fourth aspect of the present invention, the field current flowing through the field coil of the generator is controlled according to the target output current of the generator and the drive speed of the generator. It is possible to accurately control the field current according to the state.

The charging power generation control device according to the invention of claim 5 has operating temperature detecting means for detecting the operating temperature of the generator, and the generator constant and the DC output equivalent resistance of the generator are the operating temperature of the generator. If it is detected by the operating temperature detecting means, if the generator constant or the DC output equivalent resistance is corrected by the detected operating temperature, the field current flowing in the field coil can be accurately measured according to the operating temperature. Can be controlled.

According to the sixth aspect of the present invention, the charging and power generation control device corrects the field current flowing through the field coil according to the target output voltage of the generator, and thereafter, the field current value, the target output current of the generator, Further, since the field current flowing through the field coil is controlled according to the driving speed of the generator, it is possible to accurately control the field current in consideration of the change in the target output voltage.

[0031]

EXAMPLES Example 1. The operation of this embodiment will be described below with reference to the drawings. This embodiment corresponds to claims 1, 2, and 3. FIG. 1 is a configuration diagram showing a charging generator control device according to the present embodiment. In the drawings, the same reference numerals as those in the drawings indicate the same or corresponding parts. In the figure, 5A is an ECU in this embodiment. The ECU 5A has the same H / W configuration as the conventional ECU 5 described above.
The configuration and operation of a program preset in a ROM (not shown) in U5A is significantly different from the conventional one. FIG. 2 is a block diagram showing a functional configuration of the ECU 5A in the present embodiment, and various means 5 of the conventional ECU 5
In addition to 1 to 54, a feedback control calculation method of the control means 52 for detecting the charge state of the battery 3 and a correction means 55 for correcting the result are provided. The ECU also constitutes a charging state detecting means and an operating state detecting means.

Next, the operation of this embodiment configured as described above will be described with reference to the flowchart of FIG. A program that implements the operation corresponding to the flowchart of FIG. 3 is stored in advance in the ROM of the ECU 5A, and is set in advance so as to be executed at predetermined time intervals. First, similarly to the conventional device, steps S1 to S4 are executed to calculate the battery voltage deviation ΔV which is the deviation between the battery terminal voltage V _B and the target battery terminal voltage Vr.

Next, in step S41, step S
Absolute value of battery voltage deviation ΔV calculated in 4 | ΔV |
Is larger than a predetermined dead zone value ΔV ₀ . If Yes is determined in step S41, the error in the battery terminal voltage V _B with respect to the target battery terminal voltage Vr is large and it is determined that the control of the battery terminal voltage is necessary, and the process proceeds to step S42. On the other hand, step S41
When it is determined to be No, it is determined that it is unnecessary to change the amount of power generation, and this processing routine ends.

In step S42, whether the battery voltage deviation ΔV is positive or negative is determined to determine whether the electric load is in the applied state or the cutoff state. When ΔV <0, the electric load is in the cutoff state, and it is determined that the amount of power generation needs to be reduced, and the process proceeds to step S43. In step S43, the battery voltage deviation ΔV is the predetermined disconnection time (ΔV
If it is <0, it is determined whether it is larger than the deviation ΔV ₂ for PID gain switching determination. Step S43
When it is determined that | ΔV |> ΔV ₂ is not satisfied, it is determined that the electric load is in the cutoff state but the voltage deviation is small, and the process proceeds to step S44.

In step S44, it is determined whether or not the load switching flag, which indicates immediately after the change from the electric load applied state to the cutoff state, is FLAG = 1. If it is determined as Yes in step S44, it is determined that it is immediately after the electric load is switched from application to interruption, and P is determined in step S45.
・ Reset the integral value ΣKi · ΔV during I / D operation output to zero. This FLAG is preset so that FLAG = 1 when the main routine in the ECU is started, and in this processing routine, step S4 is executed.
In 6, the flag is reset to FLAG = 0 so that the determination is not repeated and executed immediately after the application is turned off.

On the other hand, if No in step S44, the process proceeds to step S47. Steps S47 and S4
In each case, the P / I / D gains K _P , K _i , and K _D predetermined for each condition are read from the ROM based on the results determined in steps S43 and S44.
Read in AM.

Next, when it is determined in step S42 that the battery voltage deviation ΔV is ΔV ≧ 0, an electric load is applied and the battery terminal voltage V _B is the target battery terminal voltage V _B.
It is judged to be lower than r and power generation is necessary. As a result, in step S49, the above-described step S44 is performed.
Then, the flag for determining that the application state of the electric load is switched to the cutoff state is set to FLAG = 1. Next, in step S50, the absolute value of the battery voltage deviation ΔV is set in order to select the P · I · D gains that are optimally set in advance and stored in the ROM according to the magnitude of the electric load.
It is determined whether V│ is larger or smaller than a predetermined value ΔV ₁ .

Then, if | ΔV |> ΔV ₁ , the P / I / D gain for applying a large capacity electric load is read in step S51, or if | ΔV│ <ΔV _{1 the} small capacity electric load is used in step S51. Load P / I / D gains K _P , K _i , and K _D are read from the ROM. As described above, according to the magnitude of the battery voltage deviation ΔV, the predetermined values ΔV ₁ and ΔV ₂ are used as thresholds to switch the P, I and D gains, and the responsiveness and control system stability are improved. I try to balance my gender. Further, since a judgment condition for not performing control by the dead zone ΔV ₀ is also included in order to prevent a sensitive control operation, excessive and unnecessary power generation is not performed.

Then, in step S53, step S4
3, P ・ I ・ D gain read based on the comparison calculation result of S44, S50 is substituted into the above (1), and P ・ I ・
The D calculation is performed to calculate the target generated current Ia. After that, if the target generated current Ia is calculated, in the same manner as the conventional device, in step S6, a table look-up is performed from a two-dimensional map (not shown) of the target generated current Ia and Ne input from the crank angle sensor 7. Up, first, the current control value If of the field coil 1b is determined.

Further, in step S7, the drive duty x of the field coil 1b, which is predetermined with respect to the current control value If, is set.
Is determined by a table lookup, the process proceeds to step S8, and the drive duty x is set in the field coil drive circuit (not shown) from the field coil drive terminal 5a. As a result, the battery terminal voltage V _B can always be feedback-controlled with high accuracy and responsiveness to the target battery voltage Vr.

Further, in the conventional apparatus, when the integral term ΣKi · ΔV in the P · I · D control arithmetic expression takes a large positive value immediately after switching from the electric load application to the cutoff state, The integral term ΣKi · ΔV cannot be reduced to a small value or zero in a short time in order to reduce the amount of power generation according to the interruption of the electric load, and the battery terminal voltage V _B becomes larger than the target battery terminal voltage Vr. Etc., the battery voltage fluctuates, which causes excessive brightness and shortens the life of the lamp.

On the other hand, in this embodiment of the present invention, the switching of the electrical load state is detected and the integral term ΣKi · ΔV is reset to zero in steps S44 and S45 described above. Therefore, when the electric load is switched from application to interruption, the integral term can be made negative without delay, so that the amount of power generation can be reduced in a short period of time.

Example 2. Next, the present embodiment according to claim 4 will be described with reference to the drawings. FIG. 4 is a configuration diagram showing a charger / generator control device in the present embodiment. In the figure, the same reference numerals as in FIG. 1 indicate the same or corresponding parts. In the figure, 5B is an ECU in this embodiment. The configuration of the H / W is the same as that of the other embodiments, but the configuration of the program set in the ROM (not shown) in the ECU 5B is different.

FIG. 5 is a block diagram showing the functional configuration of the ECU 5B. In the figure, the same reference numerals as those in FIG. 2 indicate the same or corresponding portions. In the figure, 54B is I in this embodiment.
a / If conversion means (field coil current control means).
FIG. 6 restarts the detailed configuration diagram. The Ia / If conversion means 54B determines the field coil duty ratio x from the generator rotation speed Nalt converted from the engine rotation speed Ne and the target output current Ia. The ECU 5B also constitutes current adjusting means and rotation speed detecting means.

Before proceeding with the description of this embodiment, the process of determining the field coil duty ratio x from the generator rotational speed Nalt and the target output current Ia will be described below. FIG. 8 shows an equivalent circuit of the rectified target output current Ia of the three-phase AC generator 1 for the three-phase AC generator 1, the battery 3, and the electric load group 4 in the charging generator control device common to the present invention. Here, the total load (battery 6 and electric load group 4) viewed from the output terminal of the three-phase AC generator 1 is equivalently regarded as the resistance _RL . The following equation (2) is obtained from this equivalent circuit.

Ea = Ra × Ia + Vb (2)

Here, Ea [V] is a no-load DC output voltage (hereinafter referred to as Ea) of the three-phase AC generator 1. R
a [Ω] is a DC output equivalent resistance (hereinafter, referred to as Ra) of the three-phase AC generator 1. Vb [V] is an output terminal voltage (hereinafter referred to as V _B ) of the three-phase AC generator 1, that is, a battery terminal voltage. Further, according to a publicly known document, “Latest Electric Machinery,” by Shota Miyairi (1975, published by Maruzen, p. 19), Ea and the field current If flowing in the field coil of the three-phase AC generator 1 (hereinafter , If), there is a relation of the following expression (3).

Ea = PM × ωm × If (3)

Here, PM [H] is called a generator constant and is uniquely determined by the structure of the generator. Further, ωm is called mechanical angular velocity and is defined by the following equation (4).

Ωm = (π / 30) × Nalt (4)

Here, Nalt [rpm] is the drive speed of the three-phase AC generator 1 (hereinafter referred to as Nalt).
π is the pi. From the above equations (2), (3) and (4), the relation of the following equation (5) is obtained.

Nalt × If = (30 / PMπ) × (Ra × Ia + Vb) (5)

When the relation of the above equation (5) is examined by the experimental result of the actual generator, the relation between If and Ia for each generator rotation speed Nalt is shown in FIG. From this result, although the relationship is not strictly a straight line, a proportional relationship as shown in equation (5) can be confirmed. Moreover, the inclination increases as Nalt increases. Therefore, when correction is performed using the coefficient Kc (Nalt) with Nalt as an argument, the relationship shown in FIG. 10 is obtained. In this way, if the correction by the coefficient Kc (Nalt) is performed experimentally, the relational expression of the expression (5) is established.

In order to control the current If of the field coil 1b, PWM (Pulse Width Mo
dulation) There is a method of modulating. At this time, when voltage is applied to the field coil 1b of the three-phase AC generator 1 (when ON)
Is the terminal voltage Vb, and when the voltage is released (when it is OFF) O
As a relation between the duty ratio [V] and the duty ratio [duty] (hereinafter, referred to as “duty”), which is a duty ratio of PWM (that is, a time duty ratio at the time of ON and OFF), for example, a driving frequency is 250 [Hz]. It is generally known that there is a relationship as shown in FIG. As is clear from this result,
If and Duty are related by the following equation (6).

Duty = K × If (6)

Here, K [% / A] is a coefficient representing the slope. From the above equations (5) and (6), the field coil 1 to be given to the three-phase AC generator 1 in order to obtain the target Ia.
The PWM duty ratio of the voltage of b is given by the following equation (7).

Duty = x = {(30 × K × Kc (Nalt)) / (PMπ × Nalt)} × (Ra × Ia × Vb) ... (7)

The operation of this embodiment will be described below with reference to the flow chart of FIG. 7 based on the above equations. First, in step S70, the target output current Ia [A] is read. Next, in step S71, the generator rotation speed Nalt [rpm] is calculated from the engine rotation speed Ne [rpm]. The three-phase AC generator 1 and the internal combustion engine are connected by a pulley and a belt (not shown), and their rotation ratio (pulley ratio) is mechanically determined by their combination. Here, when the rotation ratio (pulley ratio) is α, the generator rotation speed Nalt
[Rpm] is obtained by the following (8).

Nalt [rpm] = α × Ne [rpm] (8)

Next, in step S72, the generator speed N
The conversion coefficient Kc (Nalt) is determined from alt [rpm]. This is all generator speed Nalt [rp
m] is a coefficient that satisfies the relationship of the above-mentioned equation (5), and for example, a table lookup may be performed from a table (not shown) having Nalt [rpm] as an argument. This table may be determined as follows. For example, in FIG. 9, Nalt = 1800 rpm
In the case of, the target output current Ia = 30 A becomes Nalt × I
The coefficient Kc may be a ratio with another Nalt based on the value of f.

For example, when Nalt = 1800 rpm and target output current Ia = 30 A, Nalt × If = 25.
00. When Nalt = 5000 rpm and target output current Ia = 30 A, Nalt × If = 7
It is assumed to be 500. In this case, the coefficient Kc = 7500 ÷
2500 = 3. In this way, each generator speed Nal
The coefficient Kc may be obtained for each t [rpm] and tabulated. FIG. 10 is a diagram in which the coefficient Kc is calculated and corrected for each generator rotation speed in this way.

Next, in step S73, the conversion coefficient K [%] between the predetermined field current If and the field coil duty ratio x [%], the generator constant PM [H], and the DC output of the generator. Equivalent resistance Ra [Ω], regulated voltage Vb
[V] and the target output current Ia determined in step S70,
Then, the field coil duty ratio x is calculated from the generator rotational speed Nalt determined in step S71 according to the equation (7) shown in step S73. At this time, π = 3.1415
Needless to say, it is 92 (circular ratio). The target output current Ia [A] is controlled by controlling the duty ratio of the field coil 1b in accordance with the calculated output. Except for the operation of the Ia / If conversion means 13 in FIG. 2 described above, the operation of the other means is the same as the operation of each means shown in the first embodiment, and therefore its explanation is omitted.

The calculation according to the equation (7) in step S73 may be calculated individually as described above, but K, PM, Ra and Vb are predetermined constants. Alternatively, the calculation may be performed as in the following expression (9).

(30 × K × Kc × Ra) / (PM × π) (9)

In this case, it goes without saying that the term relating to the offset amount Vb is calculated by adding the following equation (10) and added.

(30 × K × Kc × Vb) / (PM × π) (10)

The operation according to the equation (7) in step S73 may be calculated individually as described above, but division by Nalt and a table lookup of the coefficient Kc (Nalt) in step S72 are performed. The values may be calculated in advance, a table (not shown) may be created, and table lookup may be performed using Nalt [rpm] as an argument.

Example 3. In the second embodiment, the generator rotation speed Nalt converted from the engine rotation speed Ne according to the equation (7).
The field coil duty ratio x was determined from the target output current Ia and the target output current Ia. In this embodiment, the engine speed Ne is calculated according to the equation (7).
Generator rotation speed Nalt converted from, target output current I
a and the field coil current If according to the operating temperature of the generator
The field coil duty ratio x is determined from the output that corrects.

The present embodiment according to claim 5 will be described below with reference to the drawings. FIG. 12 is a configuration diagram showing a charging generator control device in the present embodiment. In the figure, the same reference numerals as in FIG. 1 indicate the same or corresponding parts. In the figure, 5C is an ECU in this embodiment. FIG. 13 is a block diagram showing the configuration of the ECU 5C. As its configuration, Ia / If conversion means 5
Except for 4C, the other means is the same as the configuration shown in the second embodiment.

As shown in FIG. 14, the Ia / If converting means 54C uses the generator speed Nalt converted from the engine speed Ne according to the equation (7), the target output current Ia, and the operating temperature of the three-phase AC generator 1. Field current control means 140 for determining the field coil duty ratio x from the field coil current correction value, engine speed Ne, and target output current Ia corrected in accordance with the operating temperature of the three-phase AC generator 1. Field current correction means 141 for correcting the field coil current If according to the above, and operating temperature detection means 142 for detecting the operating temperature of the three-phase AC generator 1 from the outputs of the water temperature sensor 9 and the intake air temperature sensor 10. ing. The ECU 5C also constitutes charging voltage detecting means, current adjusting means, and rotation speed detecting means.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. First, in step S150, the target output current Ia [A] is read. Next, in step S151, the engine speed Ne [rp is the same as step S71 in the flowchart (FIG. 7) of the second embodiment.
m], the generator rotation speed Nalt [rpm] is calculated.
Next, in step S152, the water temperature sensor output Tw
PM (Tw, Tair) and Ra (Tw, T in Eq. (7) from [° C.] and intake air temperature sensor output Tair [° C.]
air).

This PM (Tw, Tair) and Ra
(Tw, Tair) may be determined by a method of performing table lookup for a two-dimensional table (not shown) using Tw and Tair as arguments. Further, for example, a method of simply performing table lookup on the one-dimensional table on behalf of either Tw or Tair may be used. Further, for example, as in the following equations (11) and (12), RM and Ra may be corrected by selecting a correction coefficient using at least one value of Tw and Tair as an argument.

PM (Tw, Tair) = K1 (Tw) × K2 (Tair) × PM (11)

Ra (Tw, Tair) = K3 (Tw) × K4 (Tair) × Ra (12)

K1 (Tw), K2 (Tair), K3
(Tw) and K4 (Tair) may be tables not shown, or may be functions having arguments such as Tw and Tair.

Next, in step S153, the conversion coefficient Kc (Nalt) is determined from the generator rotational speed Nalt [rpm]. This may be performed in the same manner as step S72 in FIG. Further, in step S154, a conversion coefficient K [%] between a predetermined field current If and a field coil duty ratio x [%] and a predetermined regulated voltage Vb.
[V] and the target output current I determined in step S150
a, the generator rotation speed Nalt determined in step S191
From the above, the field coil duty ratio x is calculated according to the equation (7) shown in step S154. At this time, π = 3.
It goes without saying that it is 141592 (circular ratio).
The target output current Ia [A] is controlled by controlling the duty ratio of the field coil in accordance with the calculated output.

Except for the operation of the Ia / If converting means 54C in FIG. 14 described above, the operation of the other means is the same as the operation in the above-mentioned first embodiment, and therefore its operation description is omitted. Note that the calculation according to the equation (7) in step S154 may be calculated individually as described above, but since K and Vb are predetermined constants, step S73 in FIG. It may be similarly calculated. Alternatively, division by Nalt and a table lookup value of the coefficient Kc (Nalt) in step S153 are calculated in advance, a table (not shown) is created, and table lookup is performed using Nalt [rpm] as an argument. Good.

Example 4. In the second embodiment, the generator rotation speed Nalt converted from the engine rotation speed Ne according to the equation (7).
The field coil duty ratio x was determined from the target output current Ia and the target output current Ia. In this embodiment, the engine speed Ne is calculated according to the equation (7).
Generator rotation speed Nalt and target output current Ia converted from
And the target battery terminal voltage Vr, the field coil current I
The field coil duty ratio x is determined by correcting f.

The present embodiment according to claim 6 will be described below with reference to the drawings. FIG. 16 is a configuration diagram showing a charging generator control device in the present embodiment. In the figure, the same reference numerals as in FIG. 1 indicate the same or corresponding parts. In the figure, 5D is an ECU in this embodiment. FIG. 17 is a block diagram showing the configuration of the ECU 5D. As its configuration, Ia / If conversion means 5
Except for 4D, the other means is the same as the configuration shown in the second embodiment.

As shown in FIG. 18, the Ia / If converting means 54D converts the engine speed Ne from the engine speed Ne according to the equation (7), the target output current Ia, and the target battery terminal voltage Vr. The field coil current control means 180 for determining the field coil duty ratio x from the correction value for correcting the magnetic coil current 1b, and the field coil current based on the target battery terminal voltage Vr set by the target voltage setting means 51. A field coil current correction means 181 for obtaining a correction coefficient of If.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. First, in step S190, the target output current Ia is read. Next, Step 19
1, the engine speed Ne [rpm] to the generator speed N
alt [rpm] is calculated. This may be the same as step S71 in the flowchart of FIG. Further, in step S192, the target battery terminal voltage V
The battery terminal voltage V _B is determined from r [V].

Next, at step 193, the generator speed N
The conversion coefficient Kc (Nalt) is determined from alt [rpm]. This may be the same as step S72 in the flowchart of FIG. Then, in step S194
Then, the conversion coefficient K [%] between the field current If and the field coil duty ratio x [%] determined in advance, the generator constant PM
[H], the DC output equivalent resistance Ra [Ω] of the generator, the target output current Ia determined in step S190, and the generator rotation speed Nalt determined in step S191 according to the equation (7) shown in step S194. The magnetic coil duty ratio x is calculated.

At this time, π = 3.1141592 (circular ratio)
Needless to say. The target output current Ia is controlled by controlling the duty ratio of the field coil according to the calculated output.
Control [A]. Ia / I in FIG. 17 described above
Except for the operation of the f conversion means 54D, the operation is the same as that of the inventions of claim 1, claim 2 and claim 3 of this embodiment.
The description of the operation of the other means in FIG. 17 is omitted.

The operation according to the equation (7) in step S194 may be calculated individually as described above, but since K, PM and Ra are predetermined constants, FIG. The calculation may be performed in the same manner as in step S73 of. Alternatively, division by Nalt and step S1
A table lookup value of the coefficient Kc (Nalt) in 93 may be calculated in advance, a table (not shown) may be created, and the table lookup may be performed using Nalt [rpm] as an argument.

Further, in the flow chart of FIG. 19, PM and Ra in the equation (7) of step S194 are set to predetermined constants, but they are corrected by the cooling water temperature and the intake air temperature as in the third embodiment of the present invention. It goes without saying that similar results can be obtained by combining the above-mentioned methods.

In the first embodiment described above, the application and interruption of the electric load is determined by the positive / negative of the battery voltage deviation ΔV. However, an electric load switch that is turned on when various electric loads are turned on is provided, This switch output is EC
Even if the input is made to U and the electric load state is judged by judging ON / OFF of the switch instead of step S105 of FIG.

Further, in the above-described first to fourth embodiments, the present invention has been described with reference to the embodiment in which the charge generator control is performed in the ECU for controlling the internal combustion engine. Even if the ECU that controls the engine or the ECU that integrally controls the internal combustion engine and the automatic transmission is configured to enable the charging and power generation control of the present invention, the same effect as that of the above embodiment can be obtained. Needless to say.

[0088]

According to the charging generator control device of the present invention, a generator driven by an internal combustion engine, and a charging state detecting means for detecting the state of the charging system charged by the current output of the generator. An operating state detecting means for detecting an operating state of the internal combustion engine; a target charging voltage set based on the operating state detected by the operating state detecting means; and a charging voltage detected by the charging state detecting means. Control means for controlling the field current flowing through the field coil of the generator so that the output current of the generator is set to a predetermined value according to the deviation, and the control calculation value of the control means is corrected according to the deviation. Since the correction means for controlling is provided, there is an effect that the fluctuation of the output current is suppressed and a stable charging voltage is obtained.

According to a second aspect of the present invention, there is provided a charging generator control device, a generator driven by an internal combustion engine, a charging state detecting means for detecting a state of a charging system charged by a current output of the generator, and Operating state detecting means for detecting the operating state of the internal combustion engine, the deviation between the target charging voltage set based on the operating state detected by the operating state detecting means and the charging voltage detected by the charging state detecting means According to the control means for controlling the field current flowing in the field coil of the generator so that the output current of the generator becomes a predetermined value, and it is determined whether the absolute value of the deviation exceeds a predetermined value. Since the determination means and the correction means for correcting and controlling the control calculation value of the control means according to the determination result are provided, it is possible to perform the excessive field current control due to the minute fluctuation of the deviation. There is an effect that it is possible to perform the fried stable charging operation.

According to a third aspect of the present invention, there is provided a charging generator control device, a generator driven by an internal combustion engine, a charging state detecting means for detecting a state of a charging system charged by a current output of the generator, Operating state detecting means for detecting the operating state of the internal combustion engine, the deviation between the target charging voltage set based on the operating state detected by the operating state detecting means and the charging voltage detected by the charging state detecting means Accordingly, the field current flowing through the field coil of the generator is set to PID so that the output current of the generator becomes a predetermined value.
Control means for controlling, judgment means for judging whether or not the charge state detection value detected by the charge state detection means exceeds a target charge voltage, and an integrated value of PID control by the control means according to the judgment result. Since the determination means determines that the detected state of charge exceeds the target charging voltage, the integral term by the control means for PID controlling the field current is provided. Is reset to zero, the time for which the charging voltage exceeds the target charging voltage can be shortened, so that there is an effect that a constant charging voltage can always be obtained.

According to a fourth aspect of the present invention, there is provided a charging generator control device, which comprises a generator driven by an internal combustion engine, and a charging voltage detecting means for detecting a charging voltage of a charging system charged by a current output of the generator. Current adjusting means for adjusting the target output current of the generator based on the voltage detected by the charging voltage detecting means, rotation speed detecting means for detecting the drive rotation speed of the generator, and target output current by the current adjusting means And field coil current control means for controlling the field current flowing to the field coil of the generator according to the drive rotation speed by the rotation detection means, even if the drive rotation speed of the generator fluctuates. There is an effect that a sufficient power generation output can be obtained.

A charging generator control device according to a fifth aspect of the present invention comprises a generator driven by an internal combustion engine, and a charging voltage detecting means for detecting a charging voltage of a charging system charged by a current output of the generator. Current adjusting means for adjusting the target output current of the generator based on the voltage detected by the charging voltage detecting means, rotation speed detecting means for detecting the drive rotation speed of the generator, and operating temperature of the generator Operating temperature detecting means, field coil current correcting means for correcting the field current flowing in the field coil of the generator based on the operating temperature detected by the temperature detecting means, and the target output current by the current adjusting means. Controlling the field current flowing through the field coil of the generator in accordance with the drive rotation speed by the rotation detection means and the field current correction value by the field coil current correction means. Since a magnetic coil current control means, there is an effect that can be performed with high accuracy field current control following the changes in the operating temperature of the generator.

A charging generator control device according to a sixth aspect of the present invention comprises a generator driven by an internal combustion engine, and a charging voltage detecting means for detecting a charging voltage of a charging system charged by a current output of the generator. A target value output means for outputting a target output current value of the generator on the basis of the voltage detected by the charging voltage detection means, and a target output voltage value for outputting the target output voltage value, and a target output voltage value output by the target value output means. Field coil current correction means for correcting the field current flowing in the field coil of the generator based on the above, rotation speed detection means for detecting the drive rotation speed of the generator, and target output by the target value output means. A field coil for controlling the field current flowing in the field coil of the generator according to the current, the field current correction value by the field coil current correction means, and the drive rotation speed by the rotation detection means. Since a current control means,
This has the effect of enabling highly accurate field current control that follows changes in the target output voltage.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a configuration of an ECU according to the present embodiment.

FIG. 3 is a flowchart illustrating the operation of this embodiment.

FIG. 4 is a configuration diagram showing a charging generator control device according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of an ECU according to the present embodiment.

FIG. 6 is a block diagram showing Ia / If conversion means according to the present embodiment.

FIG. 7 is a flowchart illustrating the operation of this embodiment.

FIG. 8 is a diagram showing an equivalent circuit of a three-phase AC generator.

FIG. 9: Target output current Ia [A], generator speed Nal
It is a relationship diagram which shows the relationship of the product of t [rpm] and the field coil current If [A].

FIG. 10: Target output current Ia [A], generator speed Na
It is a relationship diagram which shows the relationship when the product of lt [rpm] and field coil current If [A] is corrected by coefficient Kc.

FIG. 11 is a relationship diagram showing a relationship between a field coil current If [A] and a field coil duty ratio [%].

FIG. 12 is a configuration diagram showing a charging generator control device according to a third embodiment of the present invention.

FIG. 13 is a block diagram showing a configuration of an ECU according to the present embodiment.

FIG. 14 is a block diagram showing Ia / If conversion means according to the present embodiment.

FIG. 15 is a flowchart illustrating the operation of this embodiment.

FIG. 16 is a configuration diagram showing a charging generator control device according to a fourth embodiment of the present invention.

FIG. 17 is a block diagram showing a configuration of an ECU according to the present embodiment.

FIG. 18 is a block diagram showing Ia / If conversion means according to the present embodiment.

FIG. 19 is a flowchart illustrating the operation of this embodiment.

FIG. 20 is a configuration diagram showing a conventional charging generator control device.

FIG. 21 is a block diagram showing a configuration of a conventional ECU.

FIG. 22 is a flowchart illustrating an operation of a conventional charging generator control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Three-phase alternating current generator 1b Field coil 2 Full wave rectifier 3 Battery 4 Electric load group 5A-5D ECU 9 Water temperature sensor 10 Intake temperature sensor 53 Control means 55 Correction means 54A-54D Ia / If conversion means 54B, 140, 180 Field coil current control means 141, 181 Field coil current correction means 142 Operating temperature detection means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Fujiwara 840 Chiyoda-cho, Himeji City Mitsubishi Electric Corporation Himeji Works

Claims (6)

[Claims] 1. A generator driven by an internal combustion engine, a charging state detection means for detecting a state of a charging system charged by a current output of the generator, and an operating state detection for detecting an operating state of the internal combustion engine. Means, the output current of the generator according to a deviation between the target charging voltage set based on the operating condition detected by the operating condition detecting device and the charging voltage detected by the charging condition detecting device. So as to control the field current flowing in the field coil of the generator, and a correction means for correcting the control calculation value of the control means according to the deviation. Generator control device. 2. A generator driven by an internal combustion engine, a charging state detecting means for detecting a state of a charging system charged by a current output of the generator, and an operating state detecting for detecting an operating state of the internal combustion engine. Means, the output current of the generator according to a deviation between the target charging voltage set on the basis of the operating condition detected by the operating condition detecting device and the charging voltage detected by the charging condition detecting device. Control means for controlling the field current flowing in the field coil of the generator so as to determine the absolute value of the deviation exceeds a predetermined value, the determination means, depending on this determination result A charging generator control device comprising: a correction unit that corrects and controls a control calculation value of the control unit. 3. A generator driven by an internal combustion engine, a charging state detecting means for detecting a state of a charging system charged by a current output of the generator, and an operating state detecting for detecting an operating state of the internal combustion engine. Means, the output current of the generator according to a deviation between the target charging voltage set based on the operating condition detected by the operating condition detecting device and the charging voltage detected by the charging condition detecting device. Control means for PID-controlling the field current flowing in the field coil of the generator, and determining means for determining whether the charge state detection value detected by the charge state detecting means exceeds a target charge voltage. And a correction unit that corrects and controls the integrated value of the PID control by the control unit to zero according to the determination result. 4. A generator driven by an internal combustion engine, a charging voltage detecting means for detecting a charging voltage of a charging system charged by a current output of the generator, and a voltage detected by the charging voltage detecting means. Current adjusting means for adjusting the target output current of the generator, rotation speed detecting means for detecting the driving rotation speed of the generator, target output current by the current adjusting means and drive rotation speed by the rotation detecting means A charging generator control device comprising: a field coil current control means for controlling a field current flowing to a field coil of a generator. 5. A generator driven by an internal combustion engine, a charging voltage detecting means for detecting a charging voltage of a charging system charged by a current output of the generator, and a voltage detected by the charging voltage detecting means. Current adjusting means for adjusting the target output current of the generator, rotation speed detecting means for detecting the drive rotation speed of the generator, operating temperature detecting means for detecting the operating temperature of the generator, and operating temperature detection Field coil current correction means for correcting the field current flowing in the field coil of the generator based on the operating temperature detected by the means, the target output current by the current adjusting means, the drive rotation speed by the rotation detecting means, And field coil current control means for controlling the field current flowing in the field coil of the generator according to the field current correction value by the field coil current correction means. Characteristic charging generator control device. 6. A generator driven by an internal combustion engine, a charging voltage detecting means for detecting a charging voltage of a charging system charged by a current output of the generator, and a voltage detected by the charging voltage detecting means. A target value output means for outputting a target output current value of the generator and a target output voltage value, and a field coil of the generator based on the target output voltage value output by the target value output means. Field coil current correction means for correcting the flowing field current, rotation speed detection means for detecting the drive rotation speed of the generator, target output current by the target value output means, and field coil current correction means by the field coil current correction means. Field coil current control means for controlling the field current flowing in the field coil of the generator according to the magnetic current correction value and the drive rotation speed by the rotation detection means. Electric generator control device.