JP2011244631A - Power generation control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a kick back and stabilize power supply voltage.SOLUTION: A power generation control device 1 for controlling power generation torque by conducting and stopping the power generation of an AC generator 10 connected to and driven by a crank shaft 831 of an internal combustion engine 80 comprises a voltage-based power generation control necessity determination means that determines whether power generation control is necessary by comparing power supply voltage +B at a predetermined timing in a combustion process with a predetermined voltage threshold BREF, a rotation speed-based power generation control necessity determination means that determines whether power generation control is necessary by comparing rotation speed NE at a predetermined timing in a combustion process with a predetermined rotation speed threshold NEREF, a startup power generation control means that reduces the number of power generation peaks of ACG 10 when it is determined by the voltage-based power generation control necessity determination means and/or the rotation speed-based power generation control necessity determination means that the power generation control is necessary and that does not reduce the number of power generation peaks of ACG 10 when it is determined by the voltage-based power generation control necessity determination means and/or the rotation speed-based power generation control necessity determination means that the power generation control is not necessary.

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 rotation fluctuations of the internal combustion engine, and in particular, due to insufficient rotation of the crankshaft at start-up. In addition to preventing so-called ketting that continues to rotate in the reverse direction, the power supply voltage is stabilized and the startability is improved.

  If the crankshaft does not have enough momentum for cranking when starting the engine, it will not be able to resist the pressure of the compression stroke, the piston will be pushed back, the rotation of the crankshaft will reverse, and the engine will ignite in this reverse state Will proceed to the explosion process in the reverse direction, and so-called kettin is generated. Various proposals have been made on such an anti-ketching device for preventing such an engine ketchin. (For example, refer to Patent Document 1).

  In a conventional ketchin prevention device as disclosed in Patent Document 1, a rotor having a protrusion that rotates in synchronization with a crankshaft of an engine and spans a predetermined circumferential angle, and a pulsar coil that detects the protrusion are provided to perform normal rotation. Occasionally, an ignition signal is transmitted based on the crank angle detected by the pulsar coil to ignite the air-fuel mixture in the combustion chamber, and at the time of reverse rotation, ignition is prohibited by the ignition prohibition signal, forcing a misfire state and stopping the engine rotation is doing.

However, in the conventional ketchin prevention device, whether or not it is ketine is determined based on a signal detected when kettin is generated, and subsequent processing is determined.
For this reason, the occurrence of reverse rotation of the crankshaft itself cannot be prevented, and when the crankshaft is shaken back and the reverse rotation and forward rotation of the rotor are repeated, it is observed due to a change in the rotation direction of the rotor. There is a risk that the pulse interval will be shortened and it will be erroneously determined that the rotor is rotating at high speed, and ignition control will be performed without being determined to be kettin despite the occurrence of kettin, causing damage to the engine. is there.

  Further, as one of the causes of the generation of ketchin, there is a power generation torque generated when the power generator generates power. The power generation torque acts in a direction that suppresses the rotation of the crankshaft, and not only the pressure in the combustion chamber acting on the piston during the compression stroke, but also the power generation torque acts in a direction that suppresses the momentum of rotation of the crankshaft. It is a cause.

On the other hand, in recent years, even in small scooters and the like, fuel injection devices based on electronic control have been adopted to achieve low fuel consumption, exhaust gas purification, and the like.
However, when the power supply voltage of the battery or the like decreases at the time of starting, the lift amount of the fuel injection valve decreases, and an appropriate amount of fuel is not injected, so that startability may be deteriorated.
Furthermore, in an engine where a kick starter and a cell motor are installed side by side, if it is difficult to use the cell motor due to a decrease in the power supply voltage, when starting with the kick starter is insufficient, In addition to the occurrence, the amount of fuel necessary to facilitate ignition is not injected due to a decrease in the power supply voltage, which may make starting difficult.

  Therefore, in view of such circumstances, the present invention is a power generation control device that regulates power generation torque by controlling the execution and stop of power generation of a generator connected to a crankshaft of an internal combustion engine, with a simple configuration. An object of the present invention is to provide a power generation control device capable of suppressing a decrease in power supply voltage and exhibiting stable startability while preventing ketchin.

  In a first invention, in a power generation control device that controls power generation torque by executing and stopping power generation of an AC generator that is connected to a crankshaft of an internal combustion engine and is rotationally driven by rotation of the crankshaft to generate AC current. Voltage-based power generation control necessity determination means for determining whether or not power generation control is necessary by comparing the power supply voltage at a predetermined timing during the combustion stroke with a predetermined voltage threshold, and the rotation speed at a predetermined timing during the combustion stroke The rotation speed reference power generation control necessity determination means, the voltage reference power generation control necessity determination means, and / or the rotation speed reference power generation control necessity. When it is determined by the determination means that power generation suppression is necessary, the number of power generation peaks of the AC generator is reduced, and when it is determined that power generation suppression is unnecessary, the number of power generation peaks of the AC generator is decreased. ; And a start-up power generation control means for performing no starting power generation control (claim 1).

  In the second invention, when the power supply voltage is higher than a predetermined voltage threshold, the voltage-based power generation control necessity determination means makes a start-time power generation control execution determination to perform start-time power generation control, and the power supply voltage Is equal to or less than a predetermined threshold value, the start-time power generation control non-execution determination is not performed (claim 2).

  In the third invention, the rotational speed reference power generation control necessity determination means is when the rotational speed is equal to or greater than a predetermined maximum rotational speed threshold or / and when the rotational speed is equal to or smaller than a predetermined minimum rotational speed threshold. Determines whether to perform power generation control at start without performing power generation control at start, and performs power generation control at start when the rotation speed is lower than the maximum rotation speed threshold and higher than the minimum rotation speed threshold. The start-time power generation control execution determination is performed (claim 3).

  In a fourth aspect of the invention, the start-time power generation control means includes a voltage-based power generation mountain number determination step for determining the number of power generation peaks based on the power supply voltage detected by the power supply voltage detection means, and the rotation speed detected by the rotation speed detection means. Rotation speed-based power generation number determination process for determining the number of power generation mountains by the above, a final power generation number determination process for determining the final power generation number from the power generation number determined by these power generation number determination processes, Combustion stroke number calculating means for calculating a combustion stroke number corresponding to the position of the combustion stroke on the basis of the explosion stroke or immediately before the intake stroke, and a power generation necessity determination means, The sum of the voltage reference power generation number determined in the voltage reference power generation number determination process and the rotation speed reference power generation number determined in the rotation speed reference power generation number determination process, or the final When the number of electric mountains exceeds the total number of power generations of the AC generator, the total number of power generations of the generator is set as the final power generation number. When the combustion stroke number is larger than half of the final power generation number by comparison with the stroke number, power generation execution determination is performed to generate power, and the combustion stroke number is half of the final power generation number. In the following cases, power generation stoppage determination for stopping power generation is performed (claim 4).

According to the present invention, in a situation where the rotational speed of the crankshaft is relatively slow in the compression stroke and ketchin can occur, the power generation in the compression stroke is stopped to reduce the power generation torque, thereby reducing the rotational speed of the crankshaft. The crankshaft can be rotated forward against the pressure in the compression stroke without suppressing the decrease and can be led to normal combustion without generating kettin.
On the other hand, in a situation where the rotation speed of the crankshaft is further slow and the engine cannot be started at all, power is generated in the compression stroke, and the power generation torque acting in the direction opposite to the rotation direction of the crankshaft is increased. The shaft can be prevented from rotating in the reverse direction, and the engine can be stopped without generating kettin.
Furthermore, when the rotation speed of the crankshaft is sufficiently high, even if the power generation torque is large, the crankshaft can maintain a normal rotation against the pressure in the combustion chamber, so that power generation in the compression stroke can be suppressed. The power supply voltage can be stabilized.
In addition, when the power supply voltage is low and stable starting cannot be expected, priority is given to power generation, so that ignition is not performed and stable power can be supplied the next time cranking is performed.
The power generation torque is generated by electromagnetic force, and always acts in the direction opposite to the rotation direction of the crankshaft, regardless of whether the crankshaft rotates in the forward direction or the reverse direction.
For this reason, in a situation where it is possible to shift to the combustion stroke, it is possible to maintain the normal rotation by reducing the power generation torque. By increasing the value, it is possible to stabilize the power supply voltage while preventing reverse rotation, and to realize more reliable starting at the next starting opportunity.

The block diagram which shows the outline | summary of the whole electric power generation control apparatus in the 1st Embodiment of this invention. The flowchart which shows the outline | summary of a voltage reference | standard electric power generation control necessity determination means among the electric power generation control methods used for the electric power generation control apparatus of this invention. The flowchart which shows the outline | summary of a rotational speed reference | standard power generation control necessity determination means among the power generation control methods used for the power generation control apparatus of this invention. The flowchart which shows the power generation mountain number determination process among the power generation control methods used for the power generation control apparatus of this invention. The flowchart which shows the outline | summary of the electric power generation control means at the start among the electric power generation control methods used for the electric power generation control apparatus of this invention. The time chart for demonstrating the action | operation of the electric power generation control apparatus of this invention.

The present invention controls power generation torque by executing and stopping power generation of an AC generator (ACG) 10 that is connected to a crankshaft 831 of an internal combustion engine 80 and is rotationally driven by rotation of the crankshaft 831 to generate AC current. The power generation control device 1 is used.
As will be described later, the power generation control device 1 of the present invention requires voltage-based power generation control that determines whether or not power generation control is necessary by comparing the power supply voltage V _INT and a predetermined voltage threshold V _LO at a predetermined timing during the combustion stroke. Rotation speed-based power generation control required to determine whether power generation control is necessary or not by comparing the determinations S100 to S160 with the rotation speed N _INT at a predetermined timing during the combustion stroke and a predetermined rotation speed threshold (maxNEdsc, minNEdsc). When it is determined by the rejection determination means S200 to S260 and the voltage reference power generation control necessity determination means or / and the rotation speed reference power generation control necessity determination means that the power generation suppression is necessary, the number of power generation peaks of the AC generator 10 is determined. When it is determined that the power generation suppression is unnecessary, the power generation control means S40 at the time of start that performs power generation control at the time of start without reducing the number of power generation peaks of the AC generator 10 ; And a ~S470.

As an embodiment of the present invention, the power generation control device 1 provided in the kick start type internal combustion engine 80 such as a motorcycle is a case where the stepping force at the time of kick start is insufficient and when the engine can be started, During the combustion stroke, by stopping the power generation of a predetermined power generation mountain and reducing the power generation torque, the engine has rotated backward due to a phenomenon called so-called “Ketchin” in which the piston is pushed back without being able to resist the pressure during compression. By maintaining the power supply voltage + B with priority given to power generation, when the engine speed is low enough to prevent the engine from starting and when the engine is sufficiently high, It is intended to improve startability.
According to the present invention, the ketchin generated as in the prior art is not detected and the engine is not stopped afterwards, but from the power supply voltage at a predetermined time and / or the rotational speed of the crankshaft, Therefore, it is possible to prevent the occurrence of ketchin itself by using the change in the generated power generation torque by controlling the stop and execution of the power generation.

First, referring to FIG. 1, the internal combustion engine 80 constituting the 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 crankshaft 831 by depressing the kick pedal by human power. Kick at the time of kick start calculated by a kick starter 90 that rotates, an electronic control unit (ECU) 30 that controls the combustion of the internal combustion engine 80, and a crank angle sensor 71 provided as a voltage and rotation speed detection means of the power source 40 An outline of the regulator (REG) 20 that controls the execution and stop of the power generation of the ACG 10 from the rotational speed of the shaft 831 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 crankshaft 831 is connected to a kick starter 90 including a kick lever 91 that generates a rotational force by a driver's stepping through a ratchet mechanism (not shown), stepping force transmission means such as a one-way clutch, a transmission gear, and the like. Yes.

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), a magnet, a rotor (rotor), and a flywheel (not shown).
The stator is formed by winding a plurality of stator cores with a stator coil wound in series, and is arranged in a substantially radial manner. Magnets are arranged in the rotation direction on the outside of the stator, and N poles and S poles are alternately arranged. Are arranged to face the stator. A permanent magnet is used as the magnet.
Along with the rotation of the flyhole connected to the crankshaft 831, the magnet and the rotor rotate relative to the stator, so that the magnetic field in the stator coil 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 that is half that of the number of poles of the stator, and an electromotive force having a frequency proportional to the rotation speed of the crankshaft 831 is generated.
In the embodiment described later, the case where an ACG 10 having a 12-pole stator is used will be described as an example.

The ECU 30 detects a driving angle of the internal combustion engine 80 from a crank angle signal 71, a battery voltage detecting means (not shown), a sensor 70 such as a generated current sensor, a crank angle signal S _CA , a battery voltage + B, and a generated current I. Information indicating the operating status of the engine such as _GE is input, and an ignition signal IGt, a fuel injection signal, and the like to perform 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. Signals such as INJ, pump drive signal, throttle opening / closing signal SL are transmitted.
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 example, a crank angle signal S _CA is transmitted every 30 ° for one cycle of the combustion stroke (720 ° CA), and a combustion stroke number from 0 to 8 is assigned to each crank signal S _CA. (NNUM) is assigned and the crank angle signal S _CA is not detected at the crank angle CA corresponding to NNUM = 9 to 11 between which the refractor 710 is thinned, and the accurate crank is determined by specifying the position of NNUM = 0. You can see the corner CA.
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, the ECU 30 controls the power generation torque generated in the ACG 10 by turning on and off the ACG 10 by a power generation control method described later, thereby preventing ketting at the time of kick start and stabilizing the power supply voltage + B.
In the present embodiment, the stator has 12 poles. When power is generated over the entire period, 6 cycles of power generation peaks are generated per rotation, and one combustion cycle is generated. Since the crankshaft 831 rotates twice, a 12 cycle power generation peak is generated.
The ECU 30 starts power generation control at start-up, which will be described later, with reference to a time when a specific combustion stroke number (for example, NNUMK = 6) immediately before the explosion or immediately before compression is set during the combustion stroke.

The REG 20 includes opening / closing means such as a thyristor, converts the positive component of the alternating current generated in the ACG 10 into direct current in accordance with a command from the ECU 30, charges the battery 40, the fuel injection device 60, the ignition device 61, the fuel While supplying power to the drive system load LD62 such as pump, throttle valve fuel, etc., it controls the execution and stop of power generation, adjusts the power generation torque generated in the ACG 10, prevents Kettin at the start, and the power supply voltage + B is stabilized.
Further, the negative component of the alternating current generated in the ACG 10 is converted to direct current and supplied to the lighting system load LMP50.

With reference to FIG.2, FIG.3, FIG.4 and FIG. 5, the electric power generation control method used for the electric power generation control apparatus 1 of this invention is demonstrated.
As shown in FIG. 2, in the power generation control method used in the power generation control device of the present invention, the voltage-based power generation control necessity determination means in steps S100 to S160 requires the power generation control at the start-up according to the following flowchart. No is determined.
The key switch is turned on, and the ECU initialization completion determination unit in step S110 determines whether or not the initialization of the ECU 30 is completed. The determination is No until the initialization of the ECU 30 is completed, and steps S100 to S110 are repeated. It is.
In step S110, if the ECU 30 is initialized and the determination is Yes, the process proceeds to the battery voltage detection process in step S120, and the battery voltage + B in the state before starting is detected, and the value (V) is set as the battery voltage initial value V _INT. Stored in a storage device such as a memory.
Next, in the battery voltage determination means before start-up in step S130, the battery voltage initial value V _INT is compared with a predetermined minimum voltage threshold value V _LO .
If the initial voltage value V _INT exceeds the minimum voltage threshold value V _LO , the determination is Yes, the start-time power generation control execution determination is made, and the process proceeds to the start-time power generation control execution process in step S140.
When the initial voltage value V _INT exceeds the minimum voltage threshold value V _LO , depending on the rotation speed of the crankshaft at the time of kick start, there may be a case where the start is successful and a case where the start is not reached. The starting power generation control is performed.
If the initial voltage value V _INT is equal to or lower than the minimum voltage threshold value V _LO , the determination is No, it is determined that the start-time power generation control is not performed, and the process proceeds to a start-time power generation control non-execution step in step S150.
When the initial voltage value V _INT is equal to or lower than the predetermined minimum voltage threshold value V _LO , the power supply voltage is too low, and normal ignition and starting cannot be expected.
Therefore, in the starting power generation control non-execution process in step S150, power generation is prioritized over the entire period during one stroke of the combustion cycle and the battery 40 is charged without performing the starting power generation control described later. In such a situation, it is also possible to stop the engine by stopping the transmission of the ignition signal to the ignition device 61 so as not to perform ignition.
The voltage-based power generation control necessity determination unit shown in steps S100 to S160 is executed every time the AD (address) of the ECU 30 is updated, and the voltage-based power generation control necessity determination is terminated in step S160.
Further, the specific minimum voltage threshold V _LO takes into consideration the specifications of the internal combustion engine 80 to which the present invention is applied, the capacity of the battery 40, the power generation capacity of the ACG 10, the power consumption of the fuel injection device 60, the ignition device 61 and the ECU 30, and the like. And set.

With reference to FIG. 3, the outline | summary of the rotation speed reference | standard power generation control necessity determination means shown to step S200-S260 among the power generation control methods used for the power generation control apparatus of this invention is demonstrated.
If the voltage-based power generation control necessity determination unit described above determines that the power generation control is necessary, first, among the starting power generation control units, the rotation speed-based power generation control necessity determination units S200 to S260 are executed. .
In the reference position detection completion determination means in step S210, the position at which a part of the refractor 710 is thinned out is detected from the crank angle signal S _CA detected by the crank angle sensor 71, and the reference combustion stroke number NNUM is specified. Steps S200 to S210 are repeated until the above.
If the reference combustion stroke number NNUM is detected, the determination becomes Yes, and the process proceeds to the starting reference rotational speed detection stroke in step S220.
The starting reference rotation speed detecting process in step S220, the crank angle signal S _CA starting reference rotational speed NE _INT at a predetermined timing during starting from the detection interval is detected.
Next, in the first rotation speed reference power generation control necessity determination means in step S230, the necessity of start-time power generation control is determined by comparison with a predetermined maximum rotation speed threshold value maxNEsc.
If the reference rotational speed NE _INT at the start is equal to or greater than a predetermined maximum rotational speed threshold maxNEdsc, there is no possibility of causing a kick, so there is no need to perform the power generation control at the start, the determination is No, and the power generation control at the start is disabled. The execution is determined, and the process proceeds to the start-time power generation control non-execution process in step S260.
On the other hand, when the starting reference rotational speed NE _INT is lower than a predetermined maximum rotational speed threshold value maxNEdsc (for example, 1000 rpm), there is a possibility of causing ketchin, so the determination is Yes, and the second rotational speed in step S240. Proceed to the reference power generation control necessity determination means.
Next, in the second rotational speed reference power generation control necessity determination unit in step S240, the necessity for start-time power generation control is determined again by comparison with a predetermined minimum rotational speed threshold value minNEdsc.
When the starting reference rotational speed NE _INT is equal to or lower than a predetermined minimum rotational speed threshold minNEdsc (for example, 400 rpm), it is impossible to start the engine at all. The power generation control non-execution determination is made, and the process proceeds to the start power generation control non-execution step in step S260.
On the other hand, if the reference engine speed NE _INT at the start is higher than a predetermined minimum engine speed threshold minNEdsc, there is a risk of causing kettin, so that the determination is Yes, the start-time power generation control execution determination is made, and at the start of step S250 Proceed to the power generation control process.
In the start-time power generation control execution step, control proceeds to a power generation execution period determination step, which will be described later, to reduce the power generation torque in the compression step and prevent kicking while performing control for starting.
On the other hand, in the starting power generation control non-execution process, when the reference rotational speed NE _INT at the time of starting is sufficiently high, ketting does not occur. Therefore, normal power generation control is performed, and the reference rotational speed NE _INT at the time of starting is the minimum rotational speed. When it is lower than the threshold value minNEdsc, by performing normal power generation control, the power generation torque in the compression stroke can be greatly applied, and the engine can be stopped without generating kettin.
Note that the maximum engine speed threshold maxNEdsc and the minimum engine speed threshold minNEdsc are the maximum engine speed and the initial engine speed in the range where there is a possibility of the occurrence of ketchin in consideration of the engine displacement, the number of cylinders, etc. to which the present invention is applied. Set appropriately depending on the number.

With reference to FIG. 4, the outline | summary of the power generation mountain number determination process of step S300-S340 is demonstrated among the power generation control methods used for the power generation control apparatus of this invention.
The voltage reference generator mountain number determination process of step 310, based on the detected starting voltage V _INT at the battery voltage detection process in step S120, the voltage reference generator mountain number N _V is determined. Next, in the rotation speed standard power generation mountain number determination step in step S320, the rotation speed reference power generation mountain number N _NE is determined based on the start time rotation speed NE _INT detected in the start time reference rotation speed detection step in step S220. .
Then, the final power generation mountain number determination process of step S230, the voltage reference and voltage reference generation number of peaks N _V determined by the generator mountain number determination process, the engine speed reference were determined by the engine speed reference generator number of peaks determined stroke generator the number of ridges N _When the sum of _NE or the final power generation number Ntotal exceeds the total power generation number Nsum of the AC generator 10, the total power generation number Nsum of the generator is set as the final power generation number Ntotal.
Next, in the power generation execution stop execution process of step S240, execution and stop of power generation of a predetermined power generation mountain are executed according to the power generation control execution process described later according to the final power generation mountain number Ntotal.
The power generation mountain number determination steps S300 to S340 are performed every time the N signal is detected at the same time as the engine speed determination means S200 to S250.
The number of voltage reference generator mountain N _V and the engine speed reference generator number of peaks N _NE, for example, by to be prepared Table 1, the determination table shown in Table 2 as the map information, can be calculated it can.
Note that the present invention is applied to the internal combustion engine 80 having generators with different numbers of electrodes by preparing a determination table in order to determine the final power generation number Ntotal according to the number of electrodes of the ACG 10. It can be adopted as appropriate.

With reference to FIG. 5, the outline | summary of the power generation control means at the time of start of step S400-S470 is demonstrated among the power generation control methods used for the power generation control apparatus of this invention.
In the counter setting process of step S410, a process of incrementing the counter number CNT by one is performed every time the N signal is detected.
In the reference combustion stroke number determination means in step 420, for example, it is determined whether or not the reference combustion stroke number (NNUM = 6) that is immediately before the explosion stroke or immediately before the intake stroke. In the case of the reference combustion stroke number, The determination is Yes, and the process proceeds to the count reset process in step S430. After resetting the counter number CNT provided as the combustion process number calculation means to 0, the process proceeds to the power generation necessity determination means in step S440.
At positions other than the reference combustion stroke number, the determination is No, and the process proceeds to step S440 without changing the counter number CNT.
In the power generation necessity determination means in step S440, a value half the final power generation number Ntotal is compared with the counter number CNT corresponding to the combustion stroke number NNUM, and the counter number CNT is 2 of the final power generation number Ntotal. If it is larger than 1 / No, the determination is No, the process proceeds to the power generation stop determination in step S460, the power generation of the corresponding power generation mountain is stopped, and the count number CNT corresponding to the combustion stroke number NNUM is two minutes of the final power generation mountain number. In the case of 1 or less, the process proceeds to the power generation execution determination in step S450, and power generation of the corresponding power generation mountain is executed.

With reference to FIG. 6, the operation | movement of the electric power generation control apparatus 1 of this invention is demonstrated. For example, when the number of generating electrodes is 6, the total number of power generation peaks N _SUM when power generation control is not performed is 12 power generation cycles per cycle of the combustion stroke.
As shown in FIG. 6, immediately after kick start, the battery voltage is detected by the power supply voltage detection means, and based on this value, voltage reference power generation control necessity determination means S200 to rotation speed reference power generation control necessity determination means S300. Is performed, the pattern of execution and stop of the power generation of the generator 10 is determined, and the start-time power generation control S400 is started on the basis of NNUMK = 6.
For example, when the reference voltage V _INT at the start is 12v, four peaks are selected as the voltage-based power generation number N _V according to Table 1, and when the reference rotation speed NE _INT at the start is 950 rpm, According to 2, 4 mountains are selected as the rotational speed reference power generation mountain number N _NE and 8 mountains are selected as the final power generation mountain number Ntotal.
Further, the counter number CNT and half of the final power generation peak number Ntotal are compared, and the stroke of the CNT number is 4 or less, that is, the explosion stroke (CNT = 0, 1, 2, 3) and the exhaust stroke. In the initial stage (CNT = 4), the power generation of the power generation mountain in the intake stroke (CNT = 0, 1, 2, 3) is executed. The power generation in the stroke where the number of CNTs is larger than 4, that is, the exhaust stroke (CNT = 5, 6) and the compression stroke (CNT = 5, 6) is stopped.
In addition, in this figure (e), (f), the electric power generation torque which the electric power generation current when the electric power generation control at the time of start of this invention is implemented is shown as a continuous line, and the electric power generation control at the time of start of this invention is not performed as a comparative example The power generation current and power generation torque when using a conventional power generation control device are indicated by dotted lines.
As shown in this figure (e), since power generation in the compression stroke is suppressed, as shown in this figure (f), even if there is insufficient stepping at the time of kick start as shown in this figure (f), As in the embodiment shown by the solid line in (j), the forward rotation is maintained against the pressure in the combustion chamber, so that no kettin is generated.
On the other hand, in the comparative example in which the power generation control at start-up is not performed, it is not possible to resist the load in the opposite direction to the rotation direction of the crankshaft generated by the pressure in the combustion chamber and the power generation torque in the compression stroke. As shown by the dotted line in j), the motor rotates in the reverse direction. However, the output actually detected is erroneously detected as the forward rotation because the rotational speed increases apparently as shown by the dashed line in FIG. There is a risk that it will be judged and cause kettin.
In addition, when the stepping force at the kick start is further weak and the rotation speed is extremely low, the engine cannot be started, so the power generation control at the start for suppressing the power generation torque is not performed, and the entire period of the combustion cycle is not performed. Power generation. For this reason, in the compression stroke, when the rotation of the crankshaft cannot resist the pressure and the reverse rotation is likely to occur, a power generation torque opposite to the rotation direction of the crankshaft acts, so the rotation of the crankshaft Is stopped immediately and there is no risk of kettin.

The present invention is not limited to the above-described embodiment, and is appropriately changed without departing from the gist of the present invention that controls the execution and stop of power generation in the compression stroke and uses the power generation torque to prevent the occurrence of ketchin. Can do.
For example, in the above-described embodiment, the generator power generation control device provided in the kick start type internal combustion engine has been described as an example. However, the generator power generation control device provided in the motor drive type internal combustion engine using the cell motor is used. Can also be adopted as appropriate.
As another embodiment, the period of generation and stoppage of power generation is determined by the number of power generation peaks in the above-described example, but it may be determined by the position of the crank angle (stroke number NNUM) that commands execution of power generation. Good.

1 Power generation control device 10 AC generator (ACG)
20 Regulator (REG)
30 Electronic control unit (ECU)
40 Power supply (battery)
50 Lighting system load 60 Fuel injection device (INJ)
600 Fuel injection valve 61 Ignition device (IGN)
610 Spark plug 62 Addition of drive system (LD)
70 Operating condition detection means 71 Crank 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 90 Kick starter 91 Kick lever

Japanese Patent Laying-Open No. 2005-220866

Claims (4)

In a power generation control device that controls power generation torque by executing and stopping power generation of an AC generator that is connected to a crankshaft of an internal combustion engine and is rotationally driven by rotation of the crankshaft to generate AC current,
Voltage-based power generation control necessity determination means for determining whether or not power generation control is necessary by comparing a power supply voltage at a predetermined timing during a combustion stroke with a predetermined voltage threshold;
A rotation speed reference power generation control necessity determination means for determining whether or not the power generation control is necessary by comparing the rotation speed at a predetermined timing during the combustion stroke with a predetermined rotation speed threshold;
By the voltage reference power generation control necessity determination means or / and the rotation speed reference power generation control necessity determination means,
When it is determined that power generation suppression is necessary, reduce the number of power generation mountains of the AC generator,
A power generation control device comprising start-time power generation control means for performing power generation control at start-up that does not reduce the number of power generation peaks of the AC generator when it is determined that power generation suppression is unnecessary. The voltage-based power generation control necessity determination means is
When the power supply voltage is higher than a predetermined voltage threshold, the start-time power generation control execution determination for performing the start-time power generation control is performed,
2. The power generation control device according to claim 1, wherein when the power supply voltage is equal to or lower than a predetermined threshold, the start-time power generation control non-execution determination is not performed. The rotational speed reference power generation control necessity determination means includes:
When the rotation speed is equal to or greater than a predetermined maximum rotation speed threshold value and / or when the rotation speed is equal to or less than a predetermined minimum rotation speed threshold value, it is determined that start-time power generation control is not performed. ,
3. The power generation control according to claim 1, wherein when the rotational speed is lower than the maximum rotational speed threshold and higher than the minimum rotational speed threshold, the start-time power generation control execution determination for performing the start-time power generation control is performed. apparatus. The start-up power generation control means includes:
A voltage-based power generation number determination step for determining the number of power generation peaks based on the power supply voltage detected by the power supply voltage detection means;
A rotational speed reference power generation mountain number determination step for determining the power generation mountain number based on the rotational speed detected by the rotational speed detection means;
Final power generation number determination process for determining the final power generation number from the power generation number determined by these power generation number determination processes,
Combustion stroke number calculating means for calculating a combustion stroke number corresponding to the position of the combustion stroke with reference to the explosion stroke of the engine or immediately before the intake stroke;
Power generation necessity determination means,
The final power generation number determination step is the sum of the voltage reference power generation number determined in the voltage reference power generation number determination step and the rotation speed reference power generation number determined in the rotation speed reference power generation number determination step, or , If the final number of power generations exceeds the total number of power generations of the AC generator, the total number of power generations of the generator is the final number of power generations,
The power generation necessity determination means determines whether or not to generate power when the combustion stroke number is greater than half the final power generation number by comparing the final power generation number and the combustion stroke number. Done
The power generation control device according to any one of claims 1 to 3, wherein when the combustion stroke number is equal to or less than half of the number of final power generation peaks, power generation stoppage determination for stopping power generation is performed.

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