JP2011066982A - Power generation control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress rotational fluctuations and avoid overcharging of a battery for stabilizing supply voltage, in a power generation control device that controls power generation by a generator coupled to the crankshaft of an internal combustion engine which is utilized in rotational fluctuation suppression. <P>SOLUTION: The power generation control device includes a crank angle detection means 71 that detects a crank angle; a need-for-generation determining means that determines whether power generation by ACG 10 is necessary from the rotational speed of a crankshaft at a predetermined crank angle; a generation execution switching means 20, that switches between execution and stop of power generation by the ACG 10, in accordance with the result of the determination; a battery voltage detection means that detects the voltage +B of a battery 40; a charging feasibility determining means that determine whether the battery can be charged from the ACG 10 through comparison of the battery voltage +B with a predetermined voltage threshold, and a charging execution switching means (BCU, SCR<SB>2</SB>) that switches between execution and stoppage of charging of the battery from the ACG 10, in accordance with the result of the determination. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power generation control device that controls power generation torque of a generator connected to a crankshaft of an internal combustion engine and uses it to suppress rotational fluctuations of the internal combustion engine.

  In the combustion cycle of an internal combustion engine, the engine torque increases in the combustion stroke, and the engine torque decreases from the exhaust stroke to the compression stroke. In an internal combustion engine in which a generator is connected to the crankshaft, the power generation torque generated during power generation acts in a direction to suppress the rotation speed of the internal combustion engine, and the engine torque is further reduced in the process of decreasing the engine torque. Rotational fluctuation of the internal combustion engine becomes large, smooth engine rotation is hindered, and causes vibration and noise.

  With respect to such a problem, the conventional power generation control device disclosed in Patent Document 1 increases or decreases the power generation torque applied to the engine at a predetermined timing set during the combustion cycle, and suppresses fluctuations in the engine rotation speed during the combustion cycle. Timing detection means for detecting a predetermined timing of the engine, and power generation torque control means for controlling the power generation torque by switching between the power generation state and the non-power generation state of the power generation device according to the predetermined timing detected by the timing detection means. A provided power generation control device is disclosed.

  However, in the conventional power generation control method, when the battery voltage is high, the protection circuit is activated to stop the power generation so as to protect the battery from being overcharged. May not be suppressed, and vibration or the like may occur. In addition, when power generation control is performed under uniform conditions giving priority to suppression of rotational fluctuation, there is a possibility that a sufficient amount of power generation cannot be obtained, leading to a decrease in battery voltage due to insufficient charging.

  Therefore, in view of such circumstances, the present invention provides a power generation control device that uses the power generation torque of a generator connected to and driven by a crankshaft of an internal combustion engine to suppress the rotation fluctuation of the internal combustion engine. An object of the present invention is to provide a power generation control device that can achieve both voltage stabilization.

  In the first aspect of the invention, the battery is charged by a generator connected to and driven by the crankshaft of the internal combustion engine, and the power generation torque generated in the generator is controlled by controlling the power generation of the generator to rotate the crankshaft. In the power generation control device used for suppressing the fluctuation, the generator is obtained from a crank angle detecting means for detecting a crank angle of the crankshaft, and a rotational speed of the crankshaft at a predetermined crank angle detected by the crank angle detecting means. Power generation necessity determining means for determining whether or not power generation is necessary, power generation execution switching means for switching between execution and stop of power generation according to the determination result of the power generation necessity determination means, and detecting the voltage of the battery Battery generator, and the generator is compared by comparing the battery voltage detected by the battery voltage detector with a predetermined voltage threshold value. Chargeability determination means for determining whether or not the battery can be charged, and charge execution switching means for switching between execution and stop of charging from the generator to the battery according to a determination result of the chargeability determination means. (Claim 1).

  In the second invention, the power generation necessity determination means includes the generator according to a target deviation calculated from a rotational speed at the predetermined crank angle and a target rotational speed set in accordance with an operating state of the internal combustion engine. A power generation peak number determining means for determining the number of power generation peaks, and setting a priority according to the crank angle with respect to the power generation peak period of the generator generated during one cycle of the internal combustion engine, And the number of power generation peaks determined by the power generation peak number determination means determine the necessity of power generation of the generator.

  In a third aspect of the invention, the charge execution switching means causes a ground fault in a charging path from the generator to the battery when it is determined that charging is impossible by the charge availability determination means. Means (Claim 3).

  According to a fourth aspect of the present invention, when power generation is stopped by the power generation execution switching means, the open-time power generation torque acting on the internal combustion engine, the power generation execution switching means performs power generation, and the charge execution switching means is When the battery is charged, the closed-time power generation torque acting on the internal combustion engine and the power generation execution switching means generate power, and the charge execution switching means grounds the battery. In this case, a power generation torque selection means for selecting a ground fault generated power torque acting on the internal combustion engine is provided.

  In the fifth invention, the power generation mountain number determining means does not correct the target deviation when the battery voltage is lower than the threshold voltage, and when the battery voltage is equal to or higher than the voltage threshold, A target deviation correcting means for correcting the target deviation is provided.

In the sixth invention, when the target deviation correcting means determines that the battery cannot be charged, and the charging voltage ground fault means causes the charging voltage to ground to the ground side, correction calculated by closing the generation torque _{T CLS} and the deviation tau _O the open time of the generation torque _{T OPN,} the ratio of the deviation tau _S between the short-circuit power generation torque _{T SRT} and the open time of the generation torque _{T OPN} τ _O / τ _S The term _KTQ is used to correct the target deviation so as to increase apparently (claim 6).

  In a seventh aspect of the invention, the power generation execution switching means includes first switch means for opening and closing a charging path from the generator to the battery, and second charge means for the charge voltage grounding means ( Claim 7).

  In an eighth aspect of the invention, an electronic control device for controlling the operation of the internal combustion engine is provided. The electronic control device is configured to open and close the first switch means according to the determination result of the power generation necessity determination means. 1 drive trigger is transmitted, and a second drive trigger is transmitted to open and close the second switch means according to the determination result of the chargeability determination means.

According to the present invention, the battery voltage may be overcharged even when power generation is performed in order to use the power generation torque generated at the time of power generation by the generator to suppress the rotational fluctuation of the internal combustion engine. In this case, it is determined that charging is not possible by the charge availability determination unit, and charging of the battery is avoided by the charge execution switching unit.
Therefore, it is possible to achieve both suppression of rotation fluctuation and stabilization of the battery voltage. It is also possible to change the power generation torque generated by switching between the stop and execution of power generation and the stop and execution of charging, and use it for further suppression of rotational fluctuation.

The block diagram which shows the whole outline | summary of the electric power generation control apparatus in embodiment of this invention. The outline | summary of the generator used for the electric power generation control apparatus of this invention is shown, (a) is the top view, (b) is the sectional drawing. The main flowchart which shows the power generation necessity determination means used for the power generation control apparatus of this invention. (A) is a time chart which shows the effect with respect to the rotation fluctuation suppression in the combustion cycle of the power generation control method used for the power generation control apparatus of this invention, (b) is the table for power generation mountain number determination used for the said power generation control method. . (A) is a flowchart showing a method for correcting a target deviation with respect to fluctuations in battery voltage used in the power generation control device of the present invention, (b) is a correction coefficient determination table used in the correction method, and (c) is The characteristic view which shows the relationship between the rotational speed used for determination of the said correction coefficient, and electric power generation torque. The flowchart which shows the charge availability determination means used for the electric power generation control method of this invention. The characteristic view which shows the effect of the electric power generation control apparatus of this invention. The block diagram which shows the outline | summary of the electric power generation control apparatus in the 2nd Embodiment of this invention.

  The present invention relates to an alternating current generator (ACG) that is connected to a crankshaft of an internal combustion engine and is rotationally driven by the rotation of the crankshaft to generate an alternating current, and in particular, uses a permanent magnet as a field for the rotor In the power generation control device that controls the power generation of the permanent magnet synchronous ACG and uses the power generation torque generated in the ACG to suppress the rotation fluctuation of the crankshaft, the rotation fluctuation is suppressed and the overcharge of the battery charged by the ACG is prevented. Thus, the power supply voltage is stabilized.

The power generation control device of the present invention uses a predetermined crank angle timing (for example, immediately after the combustion explosion stroke) during the combustion stroke detected by the crank angle detection means as a power generation control method determination timing, and the instantaneous rotational speed at that time is the rotational speed. Detecting by the detecting means, predicting a change in the rotational speed during one cycle from the rotational speed, determining the number of power generation peaks required during the combustion cycle by the power generation number determining means, and generating priority for power generation mountains set in advance The power generation necessity determination means determines whether or not power generation is necessary so that the power generation torque according to the target rotation speed is obtained, and the execution and stop of power generation are performed using a power generation execution switching means described later according to the determination result. By switching, the desired rotation speed is quickly converged to the target rotational speed.
In addition, it is determined whether or not charging is possible by the chargeability determination unit that compares the battery voltage detected by the battery voltage detection unit and a predetermined voltage threshold, and power generation is stopped according to the determination result, or while performing power generation, The charging voltage is grounded to select whether to stop charging or to perform charging, and the battery voltage is stabilized while suppressing rotation fluctuation.

First, referring to FIG. 1 and FIG. 2, the internal combustion engine 80 constituting the entire power generation control device 1 of the present invention, the ACG 10 connected to and driven by the crankshaft 831 of the internal combustion engine 80, and the combustion of the internal combustion engine 80. An electronic control unit (ECU) 30 for controlling, and a power generation control unit (REG) 20 for controlling power generation of the ACG 10 according to a first drive trigger and a charge suppression command transmitted from the ECU 30 according to the handcuff strength of the internal combustion engine 80. The outline of will be described.
The internal combustion engine 80 includes compressed air and fuel introduced into a combustion chamber 800 defined by a substantially cylindrical cylinder 82, a cylinder head 81 that covers the upper surface of the cylinder 82, and a piston 83 that moves up and down in the cylinder 82. Combustion energy is generated by ignition of the air-fuel mixture, and the obtained combustion energy is converted into rotational force of the crankshaft 831 via the piston 83 and the connecting rod 832.
The crankshaft 831 is a mechanism for converting the lifting and lowering motion of the piston 83 such as the crank arm 833 and the counterweight 834 into the rotational motion of the crankshaft 831 and assisting the lifting and lowering of the piston 83 using the inertia of the counterweight 834. Includes those commonly used.

The cylinder head 81 includes an intake passage 810 opened and closed by an intake valve 811, an exhaust passage 820 opened and closed by an exhaust valve 821, and a fuel injection valve driven by a fuel injection device 60 to inject fuel into the intake passage 810. An (injector) 600 and a spark plug 610 driven by an ignition device (igniter) 61 are provided to ignite the air-fuel mixture in the combustion chamber 800.
The intake stroke into the combustion chamber 800 due to the opening of the intake valve 811 and the lowering of the piston 83, the fuel injection by the fuel injection device 60 and the compression stroke due to the upward movement of the piston 83, and the air-fuel mixture using the ignition device 61 The combustion cycle of the explosion stroke by ignition and the exhaust stroke by opening the exhaust valve 821 is repeated, and the upward and downward movement of the piston 83 is transmitted to the crankshaft 831 through the connecting rod 832 and the like, so that the crankshaft 831 rotates.

The ACG 10 is connected to the crankshaft 831. The ACG 10 includes a stator (stator) 11, a magnet 12, a rotor (rotor) 13, and a flywheel 14.
The stator 11 is formed by winding a plurality of stator cores 110 around which a stator coil 111 is wound, connected in series, and arranged substantially radially. Magnets 12 are arranged on the outer side of the stator 11 in the rotational direction, and N poles. And S poles are alternately arranged to face the stator 11. A permanent magnet is used for the magnet 12.
Along with the rotation of the flyhole 14 connected to the crankshaft 831, the magnet 12 and the rotor 13 rotate relative to the stator 11, whereby the magnetic field in the stator coil 111 changes and an AC is generated in the ACG 10.

In the internal combustion engine 80, the crankshaft 831 rotates twice while a one-cycle combustion stroke consisting of intake, compression, explosion, and exhaust is completed. For each rotation of the crankshaft 831, the ACG 10 has a power generation mountain cycle half that of the number of poles of the stator 11, and an electromotive force having a frequency proportional to the rotation speed of the crankshaft 831 is generated.
In the present embodiment, a configuration in which the stator 11 is provided with 8 poles as shown in FIG. 2 will be described as an example. However, the present invention does not limit the number of poles of the ACG 10, and the number of emitting electrodes is 16. A configuration with poles or 32 poles may be used. Furthermore, the ACG 10 may use an ACG starter that also functions as a starter motor.

In order to detect the operating state of the internal combustion engine 80, the ECU 30 receives a crank angle signal S _CA , a battery voltage + B, a generated current IGE, etc. from sensors 70 such as a crank angle sensor 71, a battery voltage detecting means 72, and a generated current sensor. Information indicating the operating state of the engine is input, and an ignition signal IGt, a fuel injection signal INJ, a pump for performing drive control of a power train system load 62 such as a fuel injection device 60, an igniter 61, a fuel pump (not shown), a throttle valve, etc. Transmits signals such as drive signals and throttle opening / closing signals.
A plurality of detectors (refractors) 710 are provided on the outer periphery of the flywheel 14 at predetermined intervals. A crank angle sensor 71 provided as a crank angle detection means detects the refractor 710, and a crank angle signal S _CA is transmitted from the crank angle sensor 71 to the ECU 30. At this time, since the refractor 710 at the specific position is thinned out, the crank angle CA can be accurately detected.
Specifically, for one cycle of combustion stroke (720 ° CA), for example, a crank angle signal S _CA is transmitted every 30 °, and from 0 to 8 and 12 to 20 for each crank signal S _CA. The crank angle signal S _CA is not detected in the crank angles CA corresponding to the NNUMs 9 to 11 and 21 to 23 that are assigned the stroke number (NNUM) of the refractor 710, and the accurate crank angle is determined by the NNUM specification. CA knows.
Further, the ECU 30 as the rotation speed calculation means can calculate the rotation speed V _RT of the internal combustion engine 80 from a predetermined passage time of the refractor 710 detected by the crank angle sensor 71.

Further, ECU 30 is to control the generation torque generated in ACG10 and off the ACG10, based on the crank angle signal _{S CA} input to ECU 30, and detects the rotational speed _{V RT} at a predetermined crank angle CA _S, later generator according to necessity determination means (S100~S170) for, and determine the appropriate power number of peaks _{C ACG,} opening and closing the first switching means SCR ₁ to control the power generation pattern corresponding to the rotational speed _{V RT} the ACG10 The first drive trigger T ₁ is transmitted to the power generation control unit (GCU) 22.
Further, according to the battery voltage + B, the number of power generation peaks _CACG is corrected as necessary according to a method for correcting the number of power generation peaks described later, and further, charging and stopping of the battery 40 are performed by a chargeability determination unit described later. determined, the second drive trigger T ₂ for opening and closing the second switch means SCR ₂ to disseminate to the battery control unit (BCU) 23, while suppressing the variation of the rotational speed V _RT utilizing power generation torque The battery voltage + B is further stabilized.
In this embodiment, the stator 11 has eight poles, and when power is generated over the entire period, four power generation peaks are generated per revolution, and one combustion cycle is generated. As a result, the crankshaft 831 makes two rotations, so that eight cycles of power generation peaks are generated.

The REG 20 includes a lamp control unit (LCU) 21, a power generation execution switching setting means including a _first switch means SCR ₁ and a power generation control unit (GCU) 22, a battery voltage control unit (BCU) 23, and a charging voltage ground fault. Charging execution switching means comprising _second switch means SCR ₂ provided as means.
The REG 20 converts the positive component of the alternating current generated in the ACG 10 into direct current, and controls the charging of the battery 40 by opening and closing the first switching means SCR ₁ according to the first drive trigger T ₁ transmitted from the ECU 20. At the same time, in accordance with the second drive trigger T ₂ transmitted from the ECU ₂₀ , the second switch means SCR ₂ is opened and closed to suppress overcharge of the battery 40, and the fuel injection device 60, the ignition device 61, and the fuel pump. , Supplying power to the power train system load LD 62 such as throttle valve fuel, converting the negative component of the alternating current generated in the ACG 10 into direct current, opening and closing the third switching means SCR ₃ according to the LCU 21, A single-phase half-wave rectification open-type regulator that supplies the taillight and the lamp system load 50 is configured.

In REG20, the first on-off switching means SCR _1, is adjusted power generation torque _{TQ GE} occur ACG10, while quickly converge the engine rotational speed _{V RT} the target rotational speed _{V TRG,} aiming to suppress rotational fluctuations ing.
Further, even when the first switching means SCR ₁ is closed and the power generation of the ACG 10 is performed according to the first drive trigger T ₁ transmitted from the ECU 30 in order to suppress fluctuations in the engine rotation speed. If the battery voltage + B exceeds the predetermined voltage threshold value Vref and there is a possibility that the battery 40 will be overcharged if charging continues, it is determined that charging is impossible by the charging enable / disable determining means described later, and the ECU 30 performs the second drive. The trigger T ₂ is transmitted, the second switching means SCR ₂ is closed, the charging path from the ACG 10 to the battery 40 is bypassed to the ground side, and the charging voltage from the ACG 10 is grounded, thereby overcharging the battery 40. Is prevented.
A thyristor or the like is used for the first switch means SCR ₁ , the second switch means SCR ₂ , and the third switch means SCR ₃ .

With reference to the control flowchart shown in FIG. 3, the power generation necessity determination means (S100 to S170) serving as the basis of the power generation control method applied to the power generation control device 1 of the present invention will be described.
The power generation necessity determination means shown in steps S100 to S170 determines the number of power generation peaks _CACG according to the rotational speed, and adjusts the power generation pattern, thereby suppressing the rotational fluctuation during one cycle of the combustion stroke. be able to.
In step S110 a generator control method determining timing determining means, whether the crank angle CA detected by the crank angle sensor 71 is a predetermined crank angle CA _S as timing decision power control method for determining a power control method is determined, the process proceeds to Yes when a predetermined crank angle CA _S to be determined power generation control condition, the process proceeds to No in the case of other crank angle CA.
Specifically, it is determined whether or not the stroke number indicates that it is immediately after the explosion of the combustion stroke (for example, NNUM = 12).

Then, in step S120 the rotational speed calculation means, the instantaneous rotational velocity V _RT at a predetermined crank angle CA _S is calculated as the control rotation speed.
More specifically, it calculates the rotational speed V _RT of the internal combustion engine 80 from the transit time of a predetermined Rifurakuta 710 detected by the crank angle signal S _CA inputted from the crank angle sensor 71 to the ECU30 as a rotational speed calculating means it can.
The target rotational speed _VTRG corresponding to the operating state of the internal combustion engine 80 is a target rotational speed calculation means that performs mapping processing based on the throttle opening SL, the engine temperature TW, etc., the average value of the rotational speed in a stable state, etc. Is calculated separately.

Then, in step S130 a target deviation calculating means, target deviation _{E ACG} between the rotational speed _{V RT} and the target rotational speed _{V TRG} at a predetermined crank angle CA _S is calculated, the target deviation _{E ACG} and the battery voltage by the generator mountain number determining means The number of power generation peaks _CACG is determined according to the mapping process with + B.
Then, in step S140 a power priority determining means compares the power priority _{N PR} at the crank angle CA and the appropriate power number of peaks _{C ACG} determined in step S130, the generator the number of ridges _{C ACG} is applicable power if the priority _{N PR} than proceeds to Yes, at step S150, the first driving trigger _{T 1} is oN so as to implement the power _(T 1 = 1), and the generated current _{I GE} flows, the generator torque is increased The battery 40 is charged while acting in a direction to suppress an increase in engine rotation speed.

On the other hand, in step S140, in the case of power generation priority _{N PR} value smaller than power generation number of peaks _{C ACG} is applicable, the process proceeds to No, at step S160, in order to stop the power generation, first drive trigger _{T 1} is OFF (T ₁ = 0), the generated current I _GE is cut, the generated torque is lowered, acting in the direction of mitigating the decrease in engine speed, and the charging of the battery 40 is stopped.

In step S110, except the predetermined crank angle CA _S proceeds to No, without calculating the actual rotation speed _{V RT,} the process proceeds to step S140, necessity of power in the relevant crank angle CA is in the power generation priority _{N PR} It is determined accordingly.
Rotational speed V _RT measured at the predetermined crank angle CA _S, since by friction, decreases at a constant rate, only measures the rotational speed V _RT at a predetermined crank angle CA _S, corresponding to the combustion cycles It is possible to predict changes in speed.

If the rotational speed _{V RT} at a predetermined crank angle CA _S is slower than the target speed _{V TRG} is to suppress the generation torque _{TQ GE} ACG10 becomes non-generating state, the rotational speed V at the predetermined crank angle CA _{S RT} is the earlier than the target rotational speed _{V TRG} is to increase the power generation torque _{TQ GE} ACG10 is the power generating state.
The above process is performed for each crank signal S _CA to optimize the power generation torque TQ _GE according to the combustion cycle of the internal combustion engine 80 while ensuring the necessary power generation amount.
In the present invention, instead of determining the on-off of power uniformly to a specific crank angle CA as the conventional power generation control device, and the rotational speed V _RT and the target rotational speed V _TRG at a predetermined crank angle CA _S Since the power generation control method is determined by the target deviation E _ACG according to the detected rotational speed V _RT , the power generation is not excessively suppressed.

In REG20 of the present embodiment, among the AC output generated out ACG10, on-off controlled by a first switching means SCR ₁ for opening and closing only the positive voltage half-wave according to the first driving trigger T _1, negative voltage half The wave is not subjected to on / off control by the first drive trigger T <b> 1, thereby securing a sufficient power generation amount for the lamp system load 50.
The negative voltage half-wave is distributed to the lamp system load 50 that is required to always supply power, and the battery 40 is charged and the fuel injection device 60, the ignition device 61, and the other power train system load LD62 are positive voltage half-wave. The waves are distributed.

With reference to FIG. 4, the effect of the rotational fluctuation within one cycle of the combustion stroke by the power generation control method used in the power generation control apparatus of the present invention will be described.
As shown in FIG. 4 (a), in a combustion stroke of one cycle, the crank angle CA immediately after the explosion stroke by a predetermined crank angle CA _S, determines a power generation condition.
Specifically, stroke numbers (NNUM) of 0 to 8 and 12 to 20 are assigned to the crank angle signal S _CA transmitted in one cycle of the combustion stroke, and the crank angle CA at NNUM = 12 is set to a predetermined value. as the crank angle CA _S, calculates the instantaneous rotational velocity V _RT of the time, which is the position of the power peaks, based the generation number of peaks C _ACG to oFF of the power generation based on power generation priority N _PR is determined power A pattern is determined.

In the single-cylinder engine, the rotational speed _VRT is the fastest when the explosion is completed, and the rotational speed _VRT is the slowest when compressed.
In addition, since the ACG 10 is connected to the crankshaft 831, power generation torque is generated during power generation, which acts as a braking force that suppresses rotation of the crankshaft 831.
Regardless of the power generation control method used in the power generation control device of the present invention, when power is generated in the entire stroke, the rotational speed V in the intake stroke and the compression stroke is shown as a dotted line as a comparative example in the figure. _RT further decreases.
When the power generation in the low torque stroke is stopped by the ACG 20 in accordance with the first drive trigger T ₁ transmitted from the ECU 30 and the power generation torque TQ _GE decreases, the decrease in the rotational speed V _RT is suppressed accordingly. As shown in the solid line as an example, the target rotational speed _VTRG is approached.

In the present embodiment, an example of when the target deviation EACG between the rotational speed _{V RT} at the target rotational speed _{V TRG} and the predetermined crank angle CA _S is 30.
At this time, as shown in FIG. 4 (b), according to the table set in advance the relationship between the target deviation _{E ACG} and power number of peaks _{C ACG,} power mountain number _{C ACG} is determined in 5 mountain.
Further, with respect to each of the power generation mountain power peaks that may occur 8 crests during the combustion stroke of one cycle, depending on the combustion cycle, power priority N _PR from position 1 to position 8 is set, the crank angle the magnitude of the power generation priority _{N PR} and generation number of peaks _{C ACG} corresponding to the target deviation _{E ACG} of each power peaks corresponding to CA are compared.
When power generation priority _{N PR} is smaller than the generated number of peaks _{C ACG} is the first drive trigger _{T 1} is turned ON, the power generation is permitted, generating priority _{N PR} is larger than the generated number of peaks _{C ACG} If the value is a first driving trigger T ₁ is turned OFF, the power generation is prohibited.
The power generation priority _NPR is set to a smaller value with a higher power generation priority and a larger value with a lower power generation priority.

In the present embodiment, the power generation number of peaks C _ACG is 5 mountains, power generation priority N _PR is permitted power at the crank angle CA corresponding to the 5-position from position 1, position 8 from the power priority position 6 Power generation at the corresponding crank angle CA is prohibited.
In the non-predetermined crank angle CA _S, the crank angle signal _{S CA} without used to calculate the rotational speed _{V RT,} because it is used only for comparison with the power number of peaks _{C ACG} and power priority _{N PR} ECU 30 The calculation load can be reduced.

In the power generation control device 1 of the present invention, when power generation is performed with priority on suppression of rotation fluctuation, if the battery 40 consumed by the drive system load LD60 or the like is low, overcharging may occur.
Therefore, with reference to FIG. 5, a method of correcting the target deviation _EACG , which is applied to suppress overcharge of the battery 40 while suppressing rotation fluctuation in the power generation control device 1 of the present invention, will be described.
In step S130 power mountain number determining means described above showed underlying control method for determining the power number of peaks C _ACG from target deviation E _ACG, the target deviation in accordance with the battery voltage + B in FIGS. 5 (a) The correction method is shown.
In the battery voltage determination unit in step S131, the battery voltage + B detected by the battery voltage detection unit is compared with a voltage threshold value Vref (for example, 14V). If the battery voltage + B is lower than the threshold voltage Vref, Yes is determined. the process advances, without correcting the target deviation _{E ACG,} the standard power mountain number determining means step S132, the above-mentioned step S130 generator mountain number deciding unit number generator mountain according to the target deviation _{E ACG} by the same method as _{C ACG} Is determined.
When the battery voltage + B is equal to or higher than the voltage threshold value Vref in the battery voltage determination unit in step S131, the process proceeds to No, and the target deviation E _ACG is corrected by the target deviation correction unit in step 133.
At this time, it is determined that charging of the battery 40 is impossible by a charging possibility determination unit (S200 to S240) described later, and the charging voltage is grounded to the ground side by the charging grounding unit (second switch unit SCR ₂ ). As shown in FIG. 5C, the power generation torque TQ _GE generated in the ACG 10 is lower than the closed-time power generation torque T _CLS when charging is performed, and the power generation torque TQ _GE generated when the power generation is stopped is shown. The ground fault power generation torque T _SRT is higher than the hour power generation torque T _OPN .
For this reason, the target deviation _EACG is corrected so as to increase apparently.
The correction term K _{TQ at} this time is the difference τ _O between the closed-time power generation torque T _CLS and the open-time power generation torque T _OPN when the battery voltage + B is measured (for example, 4000 rpm as shown in the figure), and the short-circuit power generation torque It is calculated by the ratio τ _O / τ _S of the deviation τ _S between T _SRT and the open-time power generation torque T _OPN, and a value as shown in FIG. 5B is used.
In the corrected power generation number determination means in step S134, the power generation number C _ACG corresponding to the corrected target deviation E _ACG in the target deviation correction means in step S133 by the same method as the step S130 power generation number determination means described above. Is determined.

With reference to FIG. 6, the method to suppress the overcharge at the time of the electric power generation used as a chargeability determination means (S200-S240) in the electric power generation control apparatus 1 of this invention is demonstrated.
In the power generation control execution state determination means in step S200, it is determined whether or not power generation control is being performed to suppress rotation fluctuation. When the power generation control for suppressing the rotation fluctuation is performed, the process proceeds to Yes. When the power generation control for suppressing the rotation fluctuation is not performed, the process proceeds to No.
The power generation state determination means at step S210, the actual power generation in the combustion cycle is determined whether it is carried out, the first switch means SCR ₁ is closed, if that is the power ON, the process proceeds to Yes. If the first switch means SCR ₁ is opened to reduce the power generation torque TQ _GE and the power generation is OFF, the process proceeds to No.
In the power generation control battery voltage determination means in step S220, it is determined whether or not the battery voltage + B is equal to or higher than a predetermined voltage threshold value Vref (for example, 14V). If the battery voltage + B is equal to or higher than the predetermined voltage threshold value Vref, the process proceeds to Yes. If the battery voltage + B is lower than the predetermined voltage threshold value Vref, the process proceeds to No.
The charge stop means step S230, the second drive trigger _{T 2} is transmitted _(T 2 = 1), second switch means SCR ₂ is closed, the charging voltage is ground, excessive charging of the battery 40 is avoided Is done.
The charging permission unit in step S240, the second drive trigger _{T 2} is stopped _(T 2 = 0), the second switch means SCR ₂ is opened. At this time, if the first switch means SCR ₁ is closed and the ACG 10 is generating power, a charging voltage is applied to the battery + B.

The effects of the present invention will be described with reference to FIG.
When the first switch means SCR ₁ is opened and the power generation of the ACG 10 is stopped, it is the disclosed power generation torque T _OPN (average τ _O ) generated by the negative power generation current that acts on the crankshaft 831. , for example, the engine speed NE is in the 2000 rpm, the instantaneous rotational speed V _RT in the combustion cycle is in a state of stopping power generation indicated by the dashed line in FIG.
When the first switch means SCR ₁ is closed and the second switch means SCR ₂ is closed, the short-circuit power generation torque T _{SRT is} larger than the open-time power generation torque T _OPN by τ _S. The rotational speed V _RT is indicated by a dotted line.
When the first switch means SCR ₁ is closed and the second switch means SCR ₂ is opened, the closed-time power generation torque T _{CLS is} larger than the open-time power generation torque T _OPN by τ _C. The rotation speed V _RT is indicated by a solid line. In response to this, the cycle average rotational speed _VRTA also changes.
Therefore, in addition to the effect of suppressing the rotation fluctuation due to the execution and stop of the power generation shown in FIG. 4, the increase and decrease of the braking torque due to the execution and stop of the charging can be used to suppress the rotation fluctuation.

With reference to FIG. 8, the outline | summary of the electric power generation control apparatus 1a in the 2nd Embodiment of this invention is demonstrated.
In the above-described embodiment, an example in which the opening and closing of the _second switch means SCR ₂ is controlled by the _second drive trigger T ₂ transmitted from the ECU 30 has been described. However, in the present embodiment, the ECU 30 a Only the first drive trigger T ₁ for controlling the opening and closing of the switch means SCR ₁ is transmitted, and the second switch is compared by comparing the battery voltage + B input to the battery control unit BCU 23 a with the reference voltage Vref adjusted to a constant voltage. An analog logic circuit that outputs a _second drive trigger T ₂ a that opens and closes the means SCR ₂ a is provided.
Also in the present embodiment, the basic power generation control method for suppressing rotational fluctuations by power generation torque is the same as the power generation control method in the first embodiment shown in FIG. It differs in that it is implemented by logic.
Even with such a configuration, it is possible to suppress overcharge and to maintain a stable power supply voltage while suppressing rotation fluctuations using power generation torque.

Further, in the above-described embodiment, whether or not charging is possible is determined from the battery voltage + B, and it is determined whether the charging voltage at the time of power generation is sent to the battery 40 or grounded, but the power generation torque TQ _GE generated in the ACG 10 is As shown in FIG. 5C, the open-time power generation torque T _OPN that does not generate power, the short-circuit power generation torque T _SRT that does not charge the battery 40, and generates power. and, and, and three values of the closed power generation torque T _CLS to charge the battery 40.
Therefore, even when the battery voltage + B is equal to or lower than the predetermined voltage threshold Vref, when the battery capacity sufficient for driving the loads 60 to 62 is ensured, the open-time power generation torque T _OPN and the short-circuit power generation torque T _SRT the provided power torque selecting means for selecting the three power generation torque TQ _GE with shaking closing generation torque T _CLS, it may be configured to be utilized to suppress the finer rotational fluctuation by proper use of the power generation torque TQ _GE.

In the above embodiment, an example in which a permanent magnet type synchronous generator using a permanent magnet as a field magnet has been described, but the power generation control device of the present invention is a power generation control device using an excitation generator. Can be diverted to.
Moreover, in the said embodiment, although the example which used the single layer type half-wave rectifier circuit (REG20) for switching to implementation and a stop of electric power generation was shown, this invention is not limited to the said embodiment, As long as the voltage can be selectively opened and closed and the ground fault can be rectified, not only half-wave rectification but also full-wave rectification may be used.
Furthermore, in the said embodiment, although the example using the single phase type generator (ACG10) was shown, this invention is employable also to a three phase type generator.

1 Power Generation Control Device 10 Generator (ACG)
20 Power generation control device (REG)
30 Electronic control unit (ECU)
40 Battery 50 Lamp system load 60 Fuel injection device 70 Sensors (operating condition detection means)
71 Crank angle sensor (crank angle detection means)
80 Internal combustion engine 800 Combustion chamber 81 Cylinder head 810 Intake cylinder 811 Intake valve 820 Exhaust cylinder 821 Exhaust valve 82 Cylinder 83 Piston 831 Crankshaft CA Crank angle CA _S Predetermined crank angle C Number of _ACG power generation peaks N _PR Generation priority NNUM Process number V _RT rotational speed V _TRG target rotational speed E _ACG target deviation I _GE power generation current TQ _GE power generation torque + B Battery voltage SCR ₁ First switch means (power generation execution switching means)
SCR ₂ second switch means (charging execution switching means, charging voltage ground fault means)
T ₁ First drive trigger T ₂ Second drive trigger GCU Power generation control unit (power generation execution switching means)
BCU battery voltage control unit (charging execution switching means)
Power generation torque when T _{OPN is} open
T _SRT Short-circuit power generation torque
_TCLS closed power generation torque
S100 to S170 Power generation necessity determination means S110 Power generation control method determination timing determination means S120 Control rotation speed calculation means S130 Power generation mountain number determination means S140 Priority order determination means S150 Power generation permission means S160 Power generation stop means S131 Battery voltage determination means S132 Standard power generation Mountain number determination means S132 Target deviation correction means S133 Corrected power generation mountain number determination means S200 to S240 Charging availability determination means S200 Power generation control execution state determination means S210 Power generation state determination means S220 Power generation control battery voltage determination means S230 Charging stop means S240 Charging Permission means

JP 2006-129680 A

Claims (8)

The battery is charged by a generator connected to and driven by the crankshaft of the internal combustion engine, and the power generation torque generated by the generator is controlled to suppress the rotational fluctuation of the crankshaft by controlling the power generation of the generator. In the power generation control device,
Crank angle detecting means for detecting the crank angle of the crankshaft;
Power generation necessity determination means for determining whether or not the generator needs to generate power from the rotational speed of the crankshaft at a predetermined crank angle detected by the crank angle detection means;
Power generation execution switching means for switching between execution and stop of power generation of the generator according to the determination result of the power generation necessity determination means;
Battery voltage detection means for detecting the voltage of the battery;
Chargeability determination means for determining whether the battery can be charged from the generator by comparing the battery voltage detected by the battery voltage detection means with a predetermined voltage threshold;
A power generation control device comprising charge execution switching means for switching between execution and stop of charging from the generator to the battery according to a determination result of the charge availability determination means. The power generation necessity determining means determines the number of power generation peaks of the generator according to a target deviation calculated from a rotational speed at the predetermined crank angle and a target rotational speed set according to an operating state of the internal combustion engine. Equipped with power generation mountain number determination means
A priority is set according to the crank angle with respect to the power generation peak period of the generator generated during one cycle of the internal combustion engine, and the priority and the number of power generation peaks determined by the power generation peak number determination means The power generation control device according to claim 1, wherein the necessity of power generation of the generator is determined by comparison.   The charging execution switching means includes charging voltage grounding means for grounding a charging path from the generator to the battery to the ground side when it is determined that charging is impossible by the charging availability determination means. The power generation control device according to 1 or 2. Open power generation torque acting on the internal combustion engine when power generation is stopped by the power generation execution switching means;
A closed-time power generation torque acting on the internal combustion engine when power generation is performed by the power generation execution switching means and the battery is charged by the charge execution switching means;
Power generation torque selection means for selecting a power generation torque at the time of ground fault that acts on the internal combustion engine when power generation is performed by the power generation execution switching means and when charging of the battery is grounded by the charge execution switching means The power generation control device according to claim 1, comprising:   The power generation number determining means does not correct the target deviation when the battery voltage is lower than the threshold voltage, and corrects the target deviation when the battery voltage is equal to or higher than the voltage threshold. The power generation control device according to any one of claims 1 to 4, further comprising target deviation correction means. When the target deviation correction means causes the charging voltage to ground with the charging voltage ground fault means,
A deviation tau _O of the closed power generation torque _{T CLS} opened during power generation torque _{T OPN} when the battery voltage measurement, the ratio of the deviation tau _S between the short-circuit power generation torque _{T SRT} and the open time of the generation torque _{T OPN} τ _O / τ The power generation control device according to claim 5, wherein the target deviation is corrected so as to increase apparently using the correction term K _TQ calculated by _S. First switch means for opening and closing a charging path from the generator to the battery as the power generation execution switching means;
The power generation control device according to any one of claims 4 to 6, further comprising second switch means as the charging voltage ground fault means.   An electronic control device for controlling the operation of the internal combustion engine is provided, and the electronic control device transmits a first drive trigger to open and close the first switch means in accordance with a determination result of the power generation necessity determination means. The power generation control device according to claim 7, wherein a second drive trigger is transmitted to open and close the second switch unit according to a determination result of the chargeability determination unit.

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