JP3775148B2 - Internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an internal combustion engine including an electromagnetic valve device that electromagnetically opens and closes an intake / exhaust valve, and more particularly, an internal combustion engine that controls a power balance including a generator and a storage battery that supply electric power to the electromagnetic valve device. Related to institutions.
[0002]
[Prior art]
Conventionally, a configuration has been proposed in which an intake / exhaust valve of an internal combustion engine is electrically driven instead of the currently mainstream cam drive. According to the configuration in which the intake / exhaust valve is electrically driven, a rotation mechanism such as a camshaft can be omitted and the valve timing can be easily changed. Therefore, an ideal on-off valve according to the operating state of the internal combustion engine. Timing can be arbitrarily set, and output characteristics and fuel consumption characteristics can be improved.
[0003]
And the structure by the electromagnetic actuator using an electromagnet is proposed as an electric drive device of an intake / exhaust valve. The configuration of this electromagnetic valve device is disclosed in, for example, Japanese Patent Laid-Open No. 57-44716. The actuator of this configuration has two springs, a spring that urges the movable part in the valve opening direction and a spring that urges the movable part in the valve closing direction, and each of the movable parts is in the valve opening direction. And two electromagnets that attract in the valve closing direction.
[0004]
In this case, the movable system composed of the movable portion and the valve is held at a neutral position separated from the attraction surfaces of the two electromagnets by a predetermined position by the spring force of the two springs when no current flows through the electromagnet. In addition, when an electric current is applied to one of the electromagnets on the valve opening side or the valve closing side, the attraction force overcomes the spring force of the spring and is attracted to the electromagnet side by the electromagnetic attraction force generated at that time. .
[0005]
When the current of the electromagnet is interrupted in this state, the movable system once passes through the neutral position by the spring force of the spring and approaches the other electromagnet. At this time, if a current is passed through the other electromagnet, the movable system is attracted to the other electromagnet.
[0006]
In this way, it is possible to displace the movable part by a predetermined displacement width according to the energization / interruption operation of the currents of the two electromagnets, and using this displacement, the valve is opened and closed. ing.
[0007]
[Problems to be solved by the invention]
However, in the internal combustion engine provided with the conventional electromagnetic valve device, since the current consumption of the electromagnetic valve device is added to the current consumption of the normal internal combustion engine, a generator having a larger capacity than the conventional one is required. In general, a large-capacity generator has a high rotational speed at which power generation is started, that is, a cut-in rotational speed, so that the storage battery is discharged near the idle rotational speed because the power generation is not performed or the power generation amount is small. There was a problem that the battery would run out and it would not be possible to restart.
[0008]
In the electromagnetic valve device, as the engine speed increases, the time rate of the operating (catching) current having a current value larger than the holding current increases, so that the average current consumption increases. For this reason, if it is attempted to supply current consumption from the generator output to the electromagnetic valve device even at the maximum number of revolutions, a larger capacity generator is required, which increases the size and weight of the generator, and makes it possible to mount the There was a problem that it became difficult.
[0009]
In addition, if a generator with a capacity that does not satisfy the current consumption at high engine speed is used, the battery will continue to discharge at high engine speeds. There arises a problem that the engine cannot be started.
[0010]
The above problems are illustrated in FIG. The current consumption of a vehicle equipped with an internal combustion engine equipped with an electromagnetic valve device increases linearly as the rotational speed increases, whereas the power generation current rises from the power generation start rotational speed to a certain extent. The current consumption cannot be exceeded up to the rotational speed. Furthermore, in the high speed range, the generated current reaches its peak and again falls below the current consumption.
[0011]
SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an internal combustion engine capable of restarting without generating a battery while traveling while ensuring vehicle mountability and engine rotation performance of a generator. It is.
[0012]
[Means for Solving the Problems]
  In order to achieve the above object, an invention according to claim 1 is an internal combustion engine including an electromagnetic valve device that opens and closes an intake valve or an exhaust valve by electromagnetic force, a storage battery that supplies electric power to the electromagnetic valve device, and A generator that is driven by an internal combustion engine to supply power to the electromagnetic valve device and charge the storage battery; and a remaining capacity determination that estimates the remaining capacity of the storage battery and determines whether the remaining capacity is equal to or less than a specified capacity And when the remaining capacity determining means determines that the remaining capacity of the storage battery is equal to or less than a specified capacity, the operating condition of the internal combustion engine is changed, and the discharge from the storage battery is stopped or charged to the storage battery. Control means forWhen the remaining capacity determining means determines that the engine capacity is equal to or less than a specified capacity, the control means is configured so that the rotational speed of the internal combustion engine is high when the power consumption of the electromagnetic valve device exceeds the power supplied to the generator. Suspending at least a part of the intake / exhaust valves or reducing the rotational speed of the internal combustion engine to a rotational speed at which the power consumption of the electromagnetic valve device is lower than the power supplied to the generator, To reduce power consumptionThis is the gist.
[0014]
  Claims to achieve the above object2The described invention is claimed.1In the internal combustion engine described above, when the rotational speed of the internal combustion engine is decreased, the control means cuts fuel, cuts ignition, decreases throttle opening, changes in valve timing by the electromagnetic valve device, intake valve or exhaust valve The gist of the invention is to reduce the rotational speed of the internal combustion engine by at least one of the rests of the engine or any combination thereof.
[0015]
  Claims to achieve the above object3The described inventionIn an internal combustion engine having an electromagnetic valve device that opens and closes an intake valve or an exhaust valve by electromagnetic force, a storage battery that supplies electric power to the electromagnetic valve device, and an electric power that is driven by the internal combustion engine and supplies the electromagnetic valve device And a generator for charging the storage battery, a remaining capacity determining means for estimating the remaining capacity of the storage battery and determining whether the remaining capacity is equal to or less than a specified capacity, and the remaining capacity determining means is a remaining capacity of the storage battery. Control means for changing the operating condition of the internal combustion engine and controlling the discharge from the storage battery to stop or charge the storage battery,When the remaining capacity determination means determines that the specified capacity or less, the control means, if the rotation speed of the internal combustion engine is low rotation, the power consumption of the electromagnetic valve device exceeds the supply power of the generator, The gist is to increase the generator output by increasing the rotational speed of the internal combustion engine to a rotational speed at which the power consumption of the electromagnetic valve device is lower than the power supplied to the generator.
[0016]
  Claims to achieve the above object4The described invention is claimed.3In the internal combustion engine described above, when the rotation speed of the internal combustion engine is increased, the control means increases the rotation speed of the internal combustion engine by increasing the throttle opening or changing the valve timing of the electromagnetic valve device. This is the gist.
[0019]
【The invention's effect】
  According to the first aspect of the present invention, in an internal combustion engine having an electromagnetic valve device that opens and closes an intake valve or an exhaust valve by electromagnetic force, a storage battery that supplies electric power to the electromagnetic valve device is driven by the internal combustion engine. A generator for supplying electric power to the electromagnetic valve device and charging the storage battery; a remaining capacity determining means for estimating a remaining capacity of the storage battery and determining whether the remaining capacity is equal to or less than a specified capacity; Control means for controlling to stop discharge of the storage battery or to charge the storage battery by changing operating conditions of the internal combustion engine when the remaining capacity determination means determines that the remaining capacity of the storage battery is equal to or less than a specified capacity; WithWhen the remaining capacity determining means determines that the predetermined capacity or less, the control means reduces the rotational speed of the internal combustion engine or at least one of the intake and exhaust valves if the rotational speed of the internal combustion engine is high. If the remaining capacity of the storage battery is sufficient even without a large-capacity generator capable of charging the entire area, the internal combustion engine The engine's inherent high-speed performance can be demonstrated, and when the remaining capacity of the storage battery falls below the specified capacity, the power consumption of the electromagnetic valve device can be reduced by reducing the engine speed or stopping some valves. There is an effect that the remaining power of the storage battery for restarting can be ensured by lowering the supplied power to prevent the battery from rising.
[0021]
  Claim2According to the described invention, the claims1In addition to the effects of the described invention, the control means, when reducing the rotational speed of the internal combustion engine, fuel cut, ignition cut, decrease in throttle opening, change in valve timing by the electromagnetic valve device, intake valve Or at least a part of the exhaust valve is stopped, or any combination thereof is used to reduce the rotational speed of the internal combustion engine. There is an effect that a small change can cope with a decrease in the remaining capacity of the storage battery.
[0022]
  Claim3According to the described invention,In an internal combustion engine having an electromagnetic valve device that opens and closes an intake valve or an exhaust valve by electromagnetic force, a storage battery that supplies electric power to the electromagnetic valve device, and an electric power that is driven by the internal combustion engine and supplies the electromagnetic valve device And a generator for charging the storage battery, a remaining capacity determining means for estimating the remaining capacity of the storage battery and determining whether the remaining capacity is equal to or less than a specified capacity, and the remaining capacity determining means is a remaining capacity of the storage battery. Control means for changing the operating condition of the internal combustion engine and controlling the discharge from the storage battery to stop or charge the storage battery,When the remaining capacity determining means determines that the engine capacity is equal to or less than the specified capacity, the control means increases the engine output by increasing the engine speed if the engine speed is low. Therefore, when the remaining capacity of the storage battery is sufficient, the idling speed is kept at a low speed to maintain fuel saving and low noise, and when the remaining capacity of the storage battery is reduced, the engine speed is increased. As a result, the power supplied to the generator is made larger than the power consumption of the electromagnetic valve device to prevent the battery from running out, and the remaining capacity of the storage battery for restarting can be secured.
[0023]
  Claim4According to the described invention, the claims3In addition to the effect of the invention described above, when the rotational speed of the internal combustion engine is increased, the control means increases the throttle opening or changes the valve timing by the electromagnetic valve device to change the rotational speed of the internal combustion engine. Therefore, there is an effect that it is possible to cope with a decrease in the remaining capacity of the storage battery with a small change of the conventional control program without providing an additional device.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a system configuration diagram showing a configuration of an embodiment in which an internal combustion engine according to the present invention is mounted on a vehicle. In the present embodiment, when the remaining capacity of the storage battery exceeds the specified capacity in the low speed range and the high speed speed range including idling, the generator and the storage battery cooperate with each other in the vehicle current consumption including the electromagnetic valve device. If the remaining capacity of the storage battery falls below the specified level, stop the discharge of the storage battery by changing the engine operating conditions to reduce the current consumption of the electromagnetic valve device or increase the power generation output of the generator. Another feature is that the remaining capacity for restarting the engine is ensured by controlling the charging state.
[0028]
In FIG. 1, an internal combustion engine of an embodiment includes an engine body 1, an electromagnetic valve device 2, a generator 3 that is rotationally driven by the engine body 1 and supplies electric power to the electromagnetic valve device 2 and other loads, A storage battery 4 that supplies power when the machine 3 is stopped or when the generated power is insufficient, is charged by the generator 3, a storage battery sensor 5 that detects the state of the storage battery 4, the entire internal combustion engine, and the electromagnetic valve device 2 An electronic control device (hereinafter abbreviated as ECU) 20 is provided.
[0029]
The generator 3 uses, for example, an alternator for a vehicle and does not require a power generation capacity sufficient to cover the current consumption at all engine speeds. However, in the engine speed range used under normal driving conditions, the power generation capacity is It exceeds the current consumption.
[0030]
Although the storage battery 4 is not particularly limited, a lead storage battery used for a normal vehicle storage battery is used, but a storage battery with sufficient capacity is selected.
[0031]
The engine body 1 includes a cylinder 6, a cylinder head 7, a piston 8, a crankshaft 9, a fuel injection valve 10, a spark plug 11, an intake valve 12, and an electromagnetic valve device that drives the intake valve 12 to open and close. 2a, an exhaust valve 13, and an electromagnetic valve device 2b that opens and closes the exhaust valve 13. Of the constituent elements of the engine body 1, those other than the electromagnetic valve devices 2 a and 2 b are normal engine constituent elements. The electromagnetic valve devices 2a and 2b are collectively indicated by reference numeral 2. Further, the intake valve 12 and the exhaust valve 13 are not particularly limited, but two valves are provided in each cylinder.
[0032]
A crank pulley 14 is provided at the front end of the crankshaft 9, a generator pulley 15 is provided on the shaft of the generator 3, and a generator belt 16 is wound around the pulleys 14 and 15, The generator 3 is rotationally driven by the rotation of the shaft 9 and can generate power.
[0033]
In FIG. 1, the ECU 20 is based on a remaining capacity determination unit 21 that determines whether the remaining capacity of the storage battery 4 is equal to or less than a specified capacity based on a signal from the storage battery sensor 5, and a determination result of the remaining capacity determination unit 21. An operating condition control unit 22 that changes engine operating conditions, a fuel injection control unit 28 that can perform fuel cut for each cylinder in accordance with a fuel cut instruction from the operating condition control unit 22, and ignition of a cylinder that has been instructed to cut fuel An ignition control unit 29 that can be stopped and an electromagnetic drive control unit 30 that can control valve timing and valve operation pause of the electromagnetic valve device 2 in accordance with instructions from the operating condition control unit 22 are provided.
[0034]
Various measurement values are input to the ECU 20 from a throttle sensor, a crank angle sensor, an air flow sensor, an oil / water temperature sensor, etc., which are not shown in the figure, and control according to the engine speed and load can be performed as normal internal combustion engine control. ing.
[0035]
The storage battery sensor 5 and the remaining capacity determination unit 21 collaborate to collect information for estimating the remaining capacity of the storage battery 4, and the remaining capacity determination unit 21 compares the estimated remaining capacity with the specified capacity. Then, it is determined whether or not the remaining capacity is equal to or less than the specified capacity.
[0036]
As the storage battery sensor 5, a current detection sensor capable of measuring the charging current Ic and the discharging current Id of the storage battery 4 is provided, and the remaining capacity determination unit 21 can estimate the remaining capacity Q according to the following equation (1).
[0037]
[Expression 1]
Q = ∫k [Ic] dt−∫ [Id] dt + Q0 (1)
Here, the charging current Ic, the charging / discharging efficiency k, the discharging current Id, and the initial capacity Q0. The charge / discharge efficiency k is a chargeable charge amount with respect to the charged charge amount, and varies depending on the type and deterioration degree of the storage battery, but generally has a value of about 0.9 to 0.8.
[0038]
When the discharge current Id is large to some extent, the remaining capacity of the storage battery 4 can be estimated based on the value of the discharge current Id and the terminal voltage E of the storage battery 4 at that time.
[0039]
FIG. 8 is an example of a remaining capacity map by terminal voltage and discharge current (normalized by nominal capacity C) per cell of the lead battery. By storing such a map in advance, the remaining capacity can be estimated by searching the map from the discharge current value and the terminal voltage value of the storage battery at that time. If for some reason, a problem occurs in the calculation of the remaining capacity by integrating the charging / discharging current, or in the sense of double monitoring of the remaining capacity, the remaining capacity may be estimated from the discharge current value and the terminal voltage. Furthermore, the minimum value of the terminal voltage may be stored as a function of temperature, and the remaining capacity may be estimated from the terminal voltage.
[0040]
Further, it is known that the electrolyte specific gravity ρ and the remaining capacity of the lead storage battery are in a substantially direct relationship. For example, as shown in FIG. 9, the remaining capacity can be obtained from the electrolyte specific gravity ρ.
[0041]
The electrolyte specific gravity can be measured based on, for example, the height of the buoy floated on the electrolyte from the liquid surface, the refractive index of the electrolyte, that is, the refraction angle of light incident on the electrolyte from a transparent medium. . You may provide the storage battery sensor which detects such electrolyte solution specific gravity.
[0042]
The operating condition control unit 22 includes an idle speed control unit 23 that changes the operating condition by increasing the idle speed when the engine speed is low, and a current consumption of the electromagnetic valve device 2 when the engine speed is high. A consumption current reduction control unit 24 that changes the operating conditions so as to reduce the exhaust gas. The consumption current reduction control unit 24 includes an exhaust valve deactivation control unit 25, an intake valve deactivation control unit 26, and a cylinder deactivation control unit 27. I have.
[0043]
The ECU 20 can be realized as hardware based on wiring logic, but program logic using a microprocessor or the like other than the electromagnetic drive control unit 30 that requires large current control for supplying an electromagnetic current of the electromagnetic valve device. Can also be realized. In the following description, it is assumed that it is realized by program logic using a microprocessor or the like.
[0044]
Next, the operation of the ECU 20 will be described in detail with reference to the flowcharts of FIGS.
[0045]
[Expression 2]
First, the symbols to be used are listed.
[0046]
n: engine speed
n1: Number of rotations for determining the rotation range
Q: Remaining capacity of storage battery
Q1: Specified capacity (minimum reserved capacity)
Q2: Steady return determination capacity (Q2> Q1)
EB: Battery voltage
IB: Battery current (-: discharge, +: charge)
k: charge / discharge efficiency
ΔT: Elapsed time from the last update of the remaining capacity to this time.
[0047]
FIG. 2 is a schematic flowchart for explaining the overall operation. The summary flowchart is summarized as follows. The ECU 20 determines the engine speed n, and divides the control at low speed and high speed. If the remaining capacity of the storage battery is equal to or less than the specified capacity at low speed, control is performed to increase the idle speed so as to stop the discharge of the storage battery by increasing the amount of power generated by the generator or to enter the charged state.
[0048]
If the remaining capacity of the storage battery is less than the specified capacity at high speed, the power consumption of the electromagnetic valve device is reduced, and all the power consumption is covered by the output of the generator, and the discharge of the storage battery is stopped or charged. . Therefore, control is performed to increase the stop valve until the power consumption and the generated power are balanced through the exhaust valve one-way stop, the intake valve one-way stop, and the cylinder stop for each cylinder having two intake and exhaust valves. Or control which continues the state which changed the operating condition is performed until the remaining capacity exceeds a predetermined capacity.
[0049]
In FIG. 2, first, a crank angle sensor signal is input (step 102; hereinafter, step is abbreviated as S). Next, the engine speed n is calculated based on the crank angle sensor signal (S104). Next, the engine speeds n1 and n determined by the performance of the generator and the power consumption of the vehicle are compared (S106).
[0050]
If n1 <n, it is determined that the output of the generator is in a low rotation range where the generator output is likely to be insufficient, the remaining capacity Q of the storage battery is updated (S108), and whether or not the updated remaining capacity Q exceeds the specified capacity Q1 Is determined (S110). The specified capacity Q1 is a specified capacity that is larger than the remaining capacity required for restart after the engine is stopped, and is a constant determined in consideration of current consumption at the time of cold start and time until complete explosion. The specified capacity Q1 may be changed according to the current outside air temperature or the minimum outside air temperature during a past fixed period.
[0051]
If it is determined in S110 that the remaining capacity Q is equal to or less than the specified capacity Q1, for example, control is performed to increase the idle speed by a predetermined speed by increasing the throttle opening, increasing the intake air amount by changing the valve timing, and the like (S112). ). Then, the remaining capacity is updated again (S114), and it is determined whether or not the storage battery current IB detected at this time is 0 or positive (S116). If the storage battery current IB is 0 or positive (+), it is determined that the discharge of the storage battery has been stopped or charged as a result of idle-up, and the process is terminated.
[0052]
If it is determined in S116 that the storage battery current IB is negative (-), the discharge state continues, and the process branches to S112 to further increase the idle speed. In this way, the idling speed is increased until the generator output is equal to or exceeds the current consumption, and the storage battery discharge is stopped or charged. As a result, the remaining capacity Q does not drop below Q1, and a restart remaining capacity is secured.
[0053]
If n exceeds n1 in the determination of S106, it is determined that the electromagnetic valve device is in a high rotation range where the current consumption is large, and the remaining capacity Q of the storage battery is updated (S118). It is determined whether or not the specified capacity Q1 is exceeded (S120).
[0054]
If it is determined in S120 that the remaining capacity Q is equal to or less than the specified capacity Q1, current consumption reduction control of the electromagnetic valve device is performed (S122). Then, the remaining capacity is updated again (S124), and it is determined whether or not the storage battery current IB detected at this time is 0 or positive (S126). If the storage battery current IB is 0 or positive (+), it is determined that the discharge of the storage battery has been stopped or charged as a result of the consumption current reduction control, and the process ends.
[0055]
If it is determined in S126 that the storage battery current IB is negative (-), the discharge state continues, and the process branches to S122 in order to further reduce the current consumption. Thus, the current consumption of the electromagnetic valve device is reduced until the generator output becomes equal to or exceeds the current consumption, and the discharge of the storage battery is stopped or charged. As a result, the remaining capacity Q does not drop below Q1, and a restart remaining capacity is secured.
[0056]
FIG. 3 is a flowchart showing details of a remaining capacity Q update routine.
First, the storage battery sensor (reference numeral 5 in FIG. 1) detects the storage battery voltage EB and the storage battery current IB, and updates these temporary storage values (S130). Next, the polarity of IB is determined (S132). If IB ≤0, the storage battery is discharged, the remaining capacity is updated by the formula of Q = Q + IB × ΔT (S134), and the process returns. ΔT is the elapsed time from the last remaining capacity update to the current time.
[0057]
If 0 <IB, it is assumed that the storage battery is charged, the remaining capacity is updated by the formula of Q = Q + kIB × ΔT (S136), and the process returns. Here, k is the charge / discharge efficiency described above.
[0058]
FIG. 4 is a flowchart for explaining the current consumption reduction control routine, and explains the details of S122 in FIG.
In FIG. 4, first, the remaining capacity Q is updated (S142), and it is determined whether or not Q exceeds the specified capacity Q1 (S144). If it exceeds, return without processing anything. If not, since the remaining capacity Q is equal to or less than the specified capacity Q1, exhaust valve suspension control is performed (S146). In this exhaust valve stop control, one of the two exhaust valves of each cylinder is held in a closed state and the opening / closing operation is not performed to reduce current consumption. The cylinders subject to exhaust valve deactivation control may be all cylinders of the engine or may be limited to some cylinders.
[0059]
There are two reasons why the exhaust valve stop control is performed before the intake valve stop control.
First, in an internal combustion engine equipped with two intake / exhaust valves, the intake / exhaust efficiency is less reduced when one of the exhaust valves through which high-temperature and high-pressure exhaust passes is stopped than when the other intake valve is stopped. Therefore, the torque drop when the one-valve is stopped is small and the influence of drivability is small.
[0060]
Second, since the force required to open the exhaust valve against the in-cylinder pressure is larger than that of the intake valve, the coil spring on the exhaust valve side is reinforced, so that the electromagnet on the exhaust valve side is moved to the intake valve side. Since several times as much current is consumed, the current consumption reduction effect due to the valve stop is great.
[0061]
Next, the remaining capacity Q is updated (S148), and it is determined whether or not the storage battery current IB is 0 or more (S150). If IB is equal to or greater than 0, the storage battery has stopped discharging or is being charged, and no further power consumption reduction is required, so the process moves to S166 and the remaining capacity Q is the second specified capacity Q2 (Q2> Q1). ) Or not. If Q2 is not exceeded, it is determined that charging is insufficient, and the process proceeds to S148, where the remaining capacity is updated and a loop is waited until Q exceeds Q2.
[0062]
If Q exceeds Q2 in the determination in S166, exhaust valve return control is performed to restore the operation of one exhaust valve that has been stopped (S172), and the routine returns to the normal operating state and returns.
[0063]
Here, the second specified capacity Q2 can be set to Q2 = Q1, but in this case, the torque reduction due to the power consumption reduction and the torque recovery due to the return of the operating state are frequently repeated, and the torque is reduced. It is thought that drivability deteriorates due to fluctuations. Therefore, the second specified capacity Q2 satisfying Q2> Q1 is used as the determination criterion in S166, and the return from the pause is delayed until a certain remaining capacity increase.
[0064]
In addition, instead of the determination of S166 and the subsequent determination step of Q2, it is possible to similarly avoid the deterioration of drivability by determining whether or not a predetermined time has elapsed.
[0065]
If it is determined in S150 that IB is negative, the discharged state is continued, so that one of the two intake valves of each cylinder is held closed to be stopped in order to further reduce power consumption. Pause control is performed (S152). As a result, the cylinder that has deactivated the intake valve further reduces the torque but continues to burn.
[0066]
Next, the remaining capacity Q is updated (S154), and it is determined whether or not the storage battery current IB is 0 or more (S156). If IB is equal to or greater than 0, the storage battery has stopped discharging or is being charged, and no further power consumption reduction is required, so the process moves to S168 and whether the remaining capacity Q exceeds the second specified capacity Q2. Determine whether or not. If Q2 is not exceeded, it is determined that the charging is insufficient, and the process proceeds to S154, where the remaining capacity is updated and loops and waits until Q exceeds Q2.
[0067]
If Q is greater than Q2 in the determination of S168, intake valve return control is performed to return the one intake valve that has stopped (S174), and exhaust valve return control is performed in S172 to return to the normal operating state. Return.
[0068]
If it is determined in S156 that IB is negative, the discharge state is continued. Therefore, in order to further reduce power consumption, all cylinder intake / exhaust valves are deactivated, and cylinder deactivation control for deactivating fuel injection and ignition (S158). As a result, the cylinder that has been stopped stops combustion. Although the cylinder can be deactivated for all cylinders, some cylinder deactivation is sufficient in view of the power generation function and the power consumption characteristics of the electromagnetic valve device.
[0069]
Next, the remaining capacity Q is updated (S160), and it is determined whether or not the storage battery current IB is 0 or more (S162). If IB is equal to or greater than 0, the storage battery has stopped discharging or is being charged, so the process moves to S170 to determine whether or not the remaining capacity Q exceeds the second specified capacity Q2. If Q2 is not exceeded, it is determined that charging is insufficient, and the process proceeds to S160, and a loop is waited until Q exceeds Q2 while updating the remaining capacity.
[0070]
If Q exceeds Q2 in the determination of S170, the cylinder return control is performed to return the operation of one intake / exhaust valve of the stopped cylinder, and the fuel injection and ignition are returned (S176), and the intake valve return control is performed in S174. In step S172, exhaust valve return control is performed to return to the normal operating state and return.
[0071]
If it is determined in S162 that IB is negative, the discharge state continues, so it is determined that there is some failure in the power generation mechanism, an alarm such as a charging warning light is lit (S164), and the process returns.
[0072]
Although not shown, when performing valve deactivation or cylinder deactivation, the torque step may be reduced by changing the valve timing before and after the deactivation. For example, by using a flexible valve timing setting function unique to an electromagnetic valve device, the intake valve closing timing (IVC) and the exhaust valve closing timing (EVC) are advanced to reduce the intake amount or increase the internal EGR. Thus, the pausing can be performed after the torque is reduced to some extent.
[0073]
Further, when the cylinder is deactivated, control may be performed to reduce the torque step by performing cylinder deactivation at the same time as the operation of the deactivation valve of the cylinder that continues to operate.
[0074]
FIG. 5 is a flowchart for explaining the details of the exhaust valve deactivation control routine, in which all cylinders of a four-cylinder engine are subject to exhaust valve deactivation control, and one-way deactivation and return of each exhaust valve are finely controlled for each cylinder. Show.
[0075]
In FIG. 5, first, the exhaust valve of the # 1 cylinder is deactivated (S202), the remaining capacity Q is updated (S204), and it is determined whether the storage battery current IB is 0 or more (S206). If IB is equal to or greater than 0, the storage battery has stopped discharging or is being charged, and no further power consumption reduction is required, so the process proceeds to S226, and whether the remaining capacity Q exceeds the second specified capacity Q2 Determine whether or not. If Q2 is not exceeded, it is determined that charging is insufficient, and the process proceeds to S204, and a loop is waited until Q exceeds Q2 while updating the remaining capacity.
[0076]
If Q exceeds Q2 in the determination in S226, # 1 cylinder exhaust valve return control is performed to restore the operation of one of the stopped exhaust valves (S234), and the routine returns to the normal operating state and returns.
[0077]
If it is determined in S206 that IB is negative, the discharged state is continued, so that the exhaust valve of the # 2 cylinder is temporarily stopped to further reduce power consumption (S208), and the remaining capacity Q is updated ( S210), it is determined whether or not the storage battery current IB is 0 or more (S212). If IB is equal to or greater than 0, the storage battery has stopped discharging or is being charged, and no further power consumption reduction is required, so the process proceeds to S228, and the remaining capacity Q exceeds the second specified capacity Q2. Determine whether or not. If Q2 is not exceeded, it is determined that charging is insufficient and the process proceeds to S210, and a loop is waited until Q exceeds Q2 while updating the remaining capacity.
[0078]
If Q exceeds Q2 in the determination of S228, the # 2 cylinder exhaust valve return control (S236) and the # 1 cylinder exhaust valve return control (S234) for returning the operation of one of the stopped exhaust valves are sequentially performed, Return to the driving state and return.
[0079]
If it is determined in S212 that IB is negative, the discharged state is continued, so that the exhaust valve of # 3 cylinder is suspended on one side to further reduce power consumption (S214), and the remaining capacity Q is updated ( S216), it is determined whether or not the storage battery current IB is 0 or more (S218). If IB is equal to or greater than 0, the storage battery has stopped discharging or is being charged, and no further power consumption reduction is required. Therefore, the process proceeds to S230 and whether the remaining capacity Q exceeds the second specified capacity Q2. Determine whether or not. If Q2 is not exceeded, it is determined that the charging is insufficient, and the process proceeds to S216, where the remaining capacity is updated and loops and waits until Q exceeds Q2.
[0080]
If Q exceeds Q2 in the determination of S230, # 3 cylinder exhaust valve return control (S238), # 2 cylinder exhaust valve return control (S236), # 1 cylinder exhaust valve that restores the operation of one of the stopped exhaust valves. Return control (S234) is sequentially performed, and the process returns to the normal operation state.
[0081]
If it is determined in S218 that IB is negative, the discharged state is continued, so that the exhaust valve of the # 4 cylinder is suspended on one side to further reduce power consumption (S220), and the remaining capacity Q is updated ( In S222, it is determined whether or not the storage battery current IB is 0 or more (S224). If IB is equal to or greater than 0, the storage battery has stopped discharging or is being charged, and no further power consumption reduction is required, so the process proceeds to S232 and whether the remaining capacity Q exceeds the second specified capacity Q2. Determine whether or not. If Q2 is not exceeded, it is determined that charging is insufficient, and the process proceeds to S222, and a loop is waited until Q exceeds Q2 while updating the remaining capacity.
[0082]
If Q exceeds Q2 in the determination of S232, # 4 cylinder exhaust valve return control (S240), # 3 cylinder exhaust valve return control (S238), # 2 cylinder exhaust valve that restores the operation of one exhaust valve that has been stopped. Return control (S236) and # 1 cylinder exhaust valve return control (S234) are sequentially performed to return to the normal operation state and return.
[0083]
If it is determined in S224 that IB is negative, the discharge state is continued, so that the operation proceeds to the intake valve suspension shown in FIG. 6 in order to further reduce power consumption.
[0084]
FIG. 6 is a flowchart for explaining the details of the intake valve deactivation control routine. In this case, all cylinders of a four-cylinder engine are subject to intake valve deactivation control, and one-way deactivation and return of each intake valve are controlled finely for each cylinder. Show.
[0085]
In FIG. 6, first, the intake valve of the # 1 cylinder is deactivated (S302), the remaining capacity Q is updated (S304), and it is determined whether the storage battery current IB is 0 or more (S306). If IB is equal to or greater than 0, the storage battery has stopped discharging or is being charged, and no further power consumption reduction is required. Therefore, the process moves to S326, and the remaining capacity Q exceeds the second specified capacity Q2. Determine whether or not. If Q2 is not exceeded, it is determined that charging is insufficient and the process proceeds to S304, and a loop is waited until Q exceeds Q2 while updating the remaining capacity.
[0086]
If it is determined in S326 that Q exceeds Q2, # 1 cylinder intake valve return control is performed to return the deactivated one intake valve (S334), and the operation returns to the exhaust valve deactivated state.
[0087]
If it is determined in S306 that IB is negative, the discharge state is continuing, so that the intake valve of the # 2 cylinder is suspended on one side to further reduce power consumption (S308), and the remaining capacity Q is updated ( S310), it is determined whether or not the storage battery current IB is 0 or more (S312). If IB is equal to or greater than 0, the storage battery has stopped discharging or is being charged, and no further power consumption reduction is required, so the process moves to S328 and the remaining capacity Q exceeds the second specified capacity Q2. Determine whether or not. If Q2 is not exceeded, it is determined that charging is insufficient and the process proceeds to S310, and a loop is waited until Q exceeds Q2 while updating the remaining capacity.
[0088]
If Q exceeds Q2 in the determination in S328, the # 2 cylinder intake valve return control (S336) and # 1 cylinder intake valve return control (S334) for returning the operation of one of the stopped intake valves to the exhaust valve are sequentially performed. Return to the resting operating state and return.
[0089]
If it is determined in S312, if IB is negative, the discharge state is continuing. Therefore, in order to further reduce power consumption, one of the intake valves of the # 3 cylinder is stopped (S314), and the remaining capacity Q is updated ( S316), it is determined whether or not the storage battery current IB is 0 or more (S318). If IB is equal to or greater than 0, the storage battery has stopped discharging or is being charged, and no further power consumption reduction is required, so the process proceeds to S330 and whether the remaining capacity Q exceeds the second specified capacity Q2. Determine whether or not. If Q2 is not exceeded, it is determined that charging is insufficient, and the process proceeds to S316, and a loop is waited until Q exceeds Q2 while updating the remaining capacity.
[0090]
If it is determined in S330 that Q exceeds Q2, # 3 cylinder intake valve return control (S338), # 2 cylinder intake valve return control (S336), and # 1 cylinder intake valve that return the operation of one of the stopped intake valves to return to operation. Return control (S334) is sequentially performed to return to the operation state of exhaust valve suspension and return.
[0091]
If it is determined in S318 that IB is negative, the discharged state is continued, so that the intake valve of the # 4 cylinder is suspended on one side to further reduce power consumption (S320), and the remaining capacity Q is updated ( S322), it is determined whether or not the storage battery current IB is 0 or more (S324). If IB is equal to or greater than 0, the storage battery has stopped discharging or is being charged, and no further power consumption reduction is required, so the process proceeds to S332, and whether the remaining capacity Q exceeds the second specified capacity Q2 Determine whether or not. If Q2 is not exceeded, it is determined that charging is insufficient, and the process proceeds to S322, and a loop is waited until Q exceeds Q2 while updating the remaining capacity.
[0092]
If Q is greater than Q2 in the determination of S332, # 4 cylinder intake valve return control (S340), # 3 cylinder intake valve return control (S338), # 2 cylinder intake valve that restores the operation of one of the stopped intake valves. The return control (S336) and the # 1 cylinder intake valve return control (S334) are sequentially performed, and the operation returns to the exhaust valve suspension operating state.
[0093]
If it is determined in S324 that IB is negative, the discharge state is continued, and therefore the process proceeds to the cylinder deactivation shown in FIG. 7 in order to further reduce power consumption.
[0094]
FIG. 7 is a flowchart for explaining the details of the cylinder deactivation control routine, and shows a case in which all cylinders of a four-cylinder engine are subject to cylinder deactivation control and cylinder deactivation and return are controlled finely for each cylinder.
[0095]
In FIG. 7, first, the remaining intake / exhaust valves of the # 1 cylinder are stopped and fuel injection and ignition are stopped (S402), the remaining capacity Q is updated (S404), and it is determined whether or not the storage battery current IB is 0 or more. (S406). If IB is equal to or greater than 0, the storage battery has stopped discharging or is being charged, and no further power consumption reduction is required, so the process proceeds to S426, and the remaining capacity Q exceeds the second specified capacity Q2. Determine whether or not. If Q2 is not exceeded, it is determined that charging is insufficient and the process proceeds to S404, and a loop is waited until Q exceeds Q2 while updating the remaining capacity.
[0096]
If Q exceeds Q2 in the determination in S426, # 1 cylinder return control is performed to return the deactivated cylinder to operation (S434), and the operation returns to the operation state in which one of the intake and exhaust valves is deactivated.
[0097]
If it is determined in S406 that IB is negative, the discharge state is continued, so that the remaining intake and exhaust valves of # 2 cylinder are stopped and fuel injection and ignition are stopped in order to further reduce power consumption ( S408), the remaining capacity Q is updated (S410), and it is determined whether or not the storage battery current IB is 0 or more (S412). If IB is equal to or greater than 0, the storage battery has stopped discharging or is being charged, and no further power consumption reduction is required. Therefore, the process moves to S428 and the remaining capacity Q exceeds the second specified capacity Q2. Determine whether or not. If Q2 is not exceeded, it is determined that charging is insufficient and the process proceeds to S410, and a loop is waited until Q exceeds Q2 while updating the remaining capacity.
[0098]
If Q is greater than Q2 in the determination of S428, the # 2 cylinder return control (S436) and the # 1 cylinder return control (S434) for returning the deactivated cylinder to operation are sequentially performed, and the intake / exhaust valves are respectively deactivated. Return to the state and return.
[0099]
If IB is negative in the determination of S412, the discharge state continues, so that the remaining intake and exhaust valves of # 3 cylinder are stopped and fuel injection and ignition are stopped to further reduce power consumption ( S414), the remaining capacity Q is updated (S416), and it is determined whether or not the storage battery current IB is 0 or more (S418). If IB is equal to or greater than 0, the storage battery has stopped discharging or is being charged, and no further power consumption reduction is required, so the process moves to S430, and the remaining capacity Q exceeds the second specified capacity Q2. Determine whether or not. If Q2 is not exceeded, it is determined that charging is insufficient, and the process proceeds to S416, and a loop is waited until Q exceeds Q2 while updating the remaining capacity.
[0100]
If Q exceeds Q2 in the determination of S430, # 3 cylinder return control (S438), # 2 cylinder return control (S436), and # 1 cylinder return control (S434) are performed in order to return the deactivated cylinder to operation. The intake and exhaust valves return to the operating state in which one of them is stopped and return.
[0101]
If it is determined in S418 that IB is negative, the discharge state is continued. Therefore, in order to further reduce power consumption, the remaining intake / exhaust valves of the # 4 cylinder are stopped and fuel injection and ignition are stopped ( S420), the remaining capacity Q is updated (S422), and it is determined whether or not the storage battery current IB is 0 or more (S424). If IB is equal to or greater than 0, the storage battery has stopped discharging or is being charged, and no further power consumption reduction is required, so the process moves to S432 and the remaining capacity Q exceeds the second specified capacity Q2. Determine whether or not. If Q2 is not exceeded, it is determined that the charging is insufficient, and the process proceeds to S422, where the remaining capacity is updated and loops and waits until Q exceeds Q2.
[0102]
If Q is greater than Q2 in S432, # 4 cylinder return control (S440), # 3 cylinder return control (S438), # 2 cylinder return control (S436), and # 1 cylinder are reset. The return control (S434) is sequentially performed, and the operation returns to the operation state in which the intake and exhaust valves are respectively suspended.
[0103]
If it is determined in S424 that IB is negative, the discharge state continues even if all cylinders are stopped. Therefore, it is determined that the power generation mechanism is faulty, and an alarm such as a charging warning light is lit and the process returns.
[0104]
As described above, according to the present invention, power is supplied to the electromagnetic valve device using a generator with good vehicle mounting properties, and the battery running while running is suppressed while minimizing the influence on the driving conditions. Can be prevented and restart capability can be secured.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram showing a configuration of an embodiment in which an internal combustion engine according to the present invention is mounted on a vehicle.
FIG. 2 is a schematic flowchart illustrating the overall operation of the embodiment.
FIG. 3 is a flowchart for explaining a remaining capacity Q update routine in the embodiment;
FIG. 4 is a flowchart illustrating a consumption current reduction control routine in the embodiment.
FIG. 5 is a flowchart illustrating an exhaust valve suspension control routine in the embodiment.
FIG. 6 is a flowchart illustrating an intake valve suspension control routine in the embodiment.
FIG. 7 is a flowchart illustrating a cylinder deactivation control routine in the embodiment.
FIG. 8 is an example of a remaining capacity map by terminal voltage and discharge current (normalized by a nominal capacity C) per cell of a lead battery.
FIG. 9 is an example of a graph for determining the remaining capacity from the electrolyte specific gravity ρ of a lead storage battery.
FIG. 10 is a diagram for explaining characteristics of generated current and consumed current with respect to engine speed.
[Explanation of symbols]
1 Engine body
2 Electromagnetic valve device
3 Generator
4 Storage battery
5 Battery sensor
6 cylinders
7 Cylinder head
8 Piston
9 Crankshaft
10 Fuel injection valve
11 Spark plug
12 Intake valve
13 Exhaust valve
14 Crank pulley
15 Generator pulley
16 Generator belt
20 ECU
21 Remaining capacity determination unit
22 Operating condition control unit
23 Idle speed controller
24 Current consumption reduction control unit
25 Exhaust valve pause control unit
26 Intake valve pause control unit
27 cylinder deactivation control unit
28 Fuel injection control unit
29 Ignition control unit
30 Electromagnetic drive controller

Claims (4)

In an internal combustion engine including an electromagnetic valve device that opens and closes an intake valve or an exhaust valve by electromagnetic force,
A storage battery for supplying power to the electromagnetic valve device;
A generator driven by the internal combustion engine to supply power to the electromagnetic valve device and to charge the storage battery;
A remaining capacity determination means for estimating a remaining capacity of the storage battery and determining whether the remaining capacity is equal to or less than a specified capacity;
When the remaining capacity determining means determines that the remaining capacity of the storage battery is equal to or less than a specified capacity, the control means is configured to change the operating condition of the internal combustion engine to stop discharging from the storage battery or to charge the storage battery. and, with a,
When the remaining capacity determining means determines that the specified capacity or less,
If the rotational speed of the internal combustion engine is high enough that the power consumption of the electromagnetic valve device exceeds the power supplied to the generator, the control means pauses at least a part of the intake / exhaust valve or the internal combustion engine The engine speed is controlled so as to reduce the power consumption of the electromagnetic valve device by reducing the power consumption of the electromagnetic valve device to a rotational speed lower than the power supplied to the generator. Internal combustion engine. The control means, when reducing the rotational speed of the internal combustion engine, fuel cut, ignition cut, throttle opening decrease, valve timing change by the electromagnetic valve device, at least a part of the intake valve or exhaust valve pause , any one or an internal combustion engine according to claim 1, wherein the reducing the rotational speed of the internal combustion engine by any combination of. In an internal combustion engine including an electromagnetic valve device that opens and closes an intake valve or an exhaust valve by electromagnetic force,
A storage battery for supplying power to the electromagnetic valve device;
A generator driven by the internal combustion engine to supply power to the electromagnetic valve device and to charge the storage battery;
A remaining capacity determination means for estimating a remaining capacity of the storage battery and determining whether the remaining capacity is equal to or less than a specified capacity;
When the remaining capacity determining means determines that the remaining capacity of the storage battery is equal to or less than a specified capacity, the control means is configured to change the operating condition of the internal combustion engine to stop discharging from the storage battery or to charge the storage battery. And comprising
When the remaining capacity determining means determines that the specified capacity or less,
If the rotational speed of the internal combustion engine is low enough that the power consumption of the electromagnetic valve device exceeds the power supplied by the generator, the control means determines the rotational speed of the internal combustion engine of the electromagnetic valve device. power consumption is increased to the rotational speed lower than the supply power of the generator, the inner combustion engine you and controls to increase the generator output. The control means, when increasing the rotational speed of the internal combustion engine, increases the rotational speed of the internal combustion engine by increasing the throttle opening or changing the valve timing by the electromagnetic valve device. Item 6. The internal combustion engine according to Item 3 .

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