JP4710188B2 - Power generation control device for power generator and power generation control method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power generation control device and a power generation control method for a generator.
[0002]
[Prior art and problems to be solved by the invention]
2. Description of the Related Art Conventionally, in an in-vehicle internal combustion engine, an economy running system (hereinafter referred to as “eco-run system”) that improves fuel efficiency by automatically stopping the internal combustion engine when the vehicle is stopped has been performed. This eco-run system is an automatic stop / start system that automatically stops the internal combustion engine when the automobile stops running at an intersection or the like, and rotates the starter during the start operation to automatically start the internal combustion engine. An example of such an automatic stop / start device for an internal combustion engine is disclosed in Japanese Patent Laid-Open No. 2000-192830.
[0003]
This automatic stop and start device for an internal combustion engine includes a generator that performs so-called voltage feedback control for controlling a generated voltage to a predetermined value, and a battery that supplies power is charged by this generator. By the way, since it is necessary to limit the heat generated by the power generation of the generator, it is conceivable to set a power upper limit value for the generated power of the generator.
[0004]
In the power generation by the generator, when the difference between the battery voltage and the target voltage is large, the battery current acceptability is high. Since the power generation control of the generator is voltage feedback control, the power generation of the generator is performed near the power upper limit value, but the generated power is always the power upper limit value depending on the feedback gain value and the method of limiting the generated power. It does not always take a value in the vicinity. Therefore, there is a problem that the convergence property of the battery voltage to the target voltage is deteriorated.
[0005]
The present invention has been made in view of the above circumstances, and its purpose is to generate power that can allow a generator by switching to feedback control with target power when convergence to a target value of feedback control is low. It is an object of the present invention to provide a power generation control device and a power generation control method for a generator that can be operated to the maximum within a capacity range and can quickly converge a generated voltage or generated current of a generator to a target value.
[0006]
[Means for Solving the Problems]
In the following, means for achieving the above object and its effects are described.
The invention described in claim 1 is a generator for supplying electric power to a load, a feedback power generation control means for feeding back the generated voltage or generated current by the generator to a predetermined target value, and Generated power control means for limiting the power generated by the generator to a predetermined power or less, determination means for determining that the convergence to the target value has been reduced during the operation of the feedback power generation control means, and the convergence is reduced And a power generation switching means for switching the power generation target so as to perform power feedback control for controlling the target power of the generator to a predetermined value.
[0007]
According to the configuration of the first aspect, the generated voltage or generated current by the generator is controlled by the feedback control means so as to be a predetermined target value. When the convergence of the generated voltage or generated current to the target value decreases, the power generation target is switched to perform power feedback control that controls the target power of the generator to a predetermined value. It is possible to operate to the maximum within the range, and it is possible to quickly converge the generated voltage or generated current of the generator to the target value.
[0008]
According to a second aspect of the present invention, in the power generation control device for a generator according to the first aspect, the determination means is configured such that a difference between the predetermined target value and an actual generated voltage value or generated current value is not less than a predetermined value. It is characterized in that the decrease in the convergence is determined based on the fact that the state is continued for a predetermined time or more.
[0009]
According to the configuration of claim 2, the convergence is based on the fact that the difference between the predetermined target value and the actual generated voltage value or generated current value is greater than or equal to the predetermined value and that the state has continued for a predetermined time or longer. Decrease can be determined.
[0010]
According to a third aspect of the present invention, in the power generation control device for a generator according to any one of the first and second aspects, the load includes a battery that stores electric power generated by the power generator.
[0011]
According to the configuration of the third aspect, the charge amount of the battery as a load can be quickly set to a predetermined target value by the generated voltage or generated current by the generator.
According to a fourth aspect of the present invention, in the power generation control device for a generator according to the third aspect, the generator is rotated by an internal combustion engine mounted on a vehicle, and the internal combustion engine is stopped while the vehicle is stopped. Is provided with an eco-run control means for automatically restarting the internal combustion engine with electric power from the battery when the stop control end condition is satisfied, and the eco-run control means has a remaining battery level equal to or less than a predetermined value. In this case, the automatic stop of the internal combustion engine is prohibited.
[0012]
According to the configuration of claim 4, when the remaining amount of the battery is equal to or less than the predetermined value, the eco-run control means prohibits the automatic stop of the internal combustion engine, but the battery charge amount can be set to the predetermined target value at an early stage. Therefore, the period during which the eco-run control can be executed can be extended.
[0013]
The invention according to claim 5 is a power generation control method for a power generator in which power generation by the power generator is feedback-controlled to control power supplied to a load, and a power generation voltage or current generated by the power generator is predetermined. A feedback step for feedback to a target value, a power control step for limiting the power generated by the generator to a predetermined power or less, and a determination that the convergence to the target value has decreased during the operation of the feedback step And a power generation switching step of switching the power generation target so as to perform power feedback control for controlling the target power of the generator to a predetermined value when convergence to the target value is reduced during the operation of the feedback step. It is characterized by providing.
[0014]
According to the structure of Claim 5, there exists an effect | action and effect similar to Claim 1.
According to a sixth aspect of the present invention, in the power generation control method for a generator according to the fifth aspect, in the determination step, the difference between the predetermined target value and an actual generated voltage value or generated current value is a predetermined value or more. It is characterized in that the decrease in the convergence is determined based on the fact that the state is continued for a predetermined time or more.
[0015]
According to the structure of Claim 6, there exists an effect | action and effect similar to Claim 2.
According to a seventh aspect of the present invention, in the power generation control method for a generator according to any one of the fifth and sixth aspects, the load includes a battery that stores electric power generated by the generator.
[0016]
According to the structure of Claim 7, there exists an effect | action and effect similar to Claim 3.
The invention according to claim 8 is the power generation control method for the generator according to claim 7, wherein the generator is rotated by an internal combustion engine mounted on a vehicle, and the internal combustion engine is stopped while the vehicle is stopped. Is provided with an eco-run control means for automatically restarting the internal combustion engine with electric power from the battery when the stop control end condition is satisfied, and the eco-run control means has a remaining battery level equal to or less than a predetermined value. In this case, the automatic stop of the internal combustion engine is prohibited.
[0017]
According to the structure of Claim 8, there exists an effect | action and effect similar to Claim 4.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is embodied in a vehicle including an internal combustion engine and a generator will be described with reference to FIGS.
[0019]
FIG. 1 is a system configuration diagram of an internal combustion engine, a generator, and their control devices to which the above-described invention is applied. Here, a gasoline engine (hereinafter referred to as “engine”) 2 is used as the internal combustion engine. The engine 2 is mounted on a vehicle for driving an automobile.
[0020]
The output of the engine 2 is output from the crankshaft 2a of the engine 2 to the output shaft 6a side via a torque converter 4 and an automatic transmission (hereinafter referred to as “A / T”) 6, and finally the wheels Is transmitted to. Apart from this, the output of the engine 2 is transmitted to the belt 14 via a pulley 10 connected to the crankshaft 2a. The other pulleys 16 and 18 are rotated by the output transmitted by the belt 14. The pulley 10 is provided with an electromagnetic clutch 10a, which is turned on (connected) and turned off (cut off) as necessary so that transmission / non-transmission of output can be switched between the pulley 10 and the crankshaft 2a. Yes.
[0021]
Of the pulleys 16 and 18, the pulley 16 is connected to the rotation shaft of the auxiliary machine 22 and can be driven by the rotational force transmitted from the belt 14. Examples of the auxiliary machine 22 include an air conditioner compressor, a power steering pump, an engine cooling water pump, and the like. Although shown as one auxiliary machine 22 in FIG. 1, one or more of an air conditioner compressor, a power steering pump, an engine cooling water pump, and the like actually exist. And it comprises so that it may rotate in conjunction with the belt 14 by providing a pulley, respectively. In the present embodiment, it is assumed that an air conditioner compressor, a power steering pump, and an engine cooling water pump are provided as the auxiliary machine 22.
[0022]
Further, a motor generator (hereinafter referred to as “M / G”) 26 is interlocked with the belt 14 by the pulley 18. The M / G 26 functions as a generator as needed (hereinafter referred to as “power generation mode” or “regeneration mode”), so that the rotational force of the engine 2 transmitted through the pulley 18 or the rotational force from the wheels. Is converted into electrical energy. Further, the M / G 26 functions as a motor (electric motor) as necessary (hereinafter referred to as “driving mode”) to rotate one or both of the engine 2 and the auxiliary machine 22 via the pulley 18 and the belt 14. .
[0023]
The M / G 26 is electrically connected to the inverter 28. When the M / G 26 is set to the power generation mode or the regenerative mode, the inverter 28 adjusts the power generation amount (power generation load) by switching, so that the M / G 26 is connected to the battery 30 for the high-voltage power source (here 36V). The battery 34 for the low-voltage power supply (12V in this case) is charged via the DC / DC converter 32 so that electric energy is charged, and the battery 34 is switched to a power source for the ignition system, meters, ECUs and others. When power generation by the M / G 26 is not performed, the high-voltage power supply battery 30 and the low-voltage power supply battery 34 are connected via the DC / DC converter 32, and thus supplied from the high-voltage power supply battery 30 side. The low-voltage power supply battery 34 is configured to always increase the storage rate to 100% by the generated power.
[0024]
When the M / G 26 is set to the drive mode, the inverter 28 drives the M / G 26 by supplying power to the M / G 26 from the high-voltage power supply battery 30 that is a power source. Thus, via the pulley 18 and the belt 14, the auxiliary machine 22 is rotated when the engine is stopped, and the crankshaft 2a is rotated as necessary at the time of automatic start, automatic stop, or vehicle start. At this time, the inverter 28 can adjust the rotation speed of the M / G 26 by adjusting the supply of electric energy from the high-voltage power supply battery 30.
[0025]
A starter 36 is provided to start the engine 2 during cold start. The starter 36 is supplied with electric power from the low-voltage power supply battery 34 and can start the engine 2 by rotating the ring gear.
[0026]
The A / T 6 is provided with an electric hydraulic pump 38 to which electric power is supplied from the low-voltage power supply battery 34, and supplies hydraulic oil to the hydraulic control unit inside the A / T 6. Using this hydraulic oil, a control valve in the hydraulic control unit adjusts the operating states of the clutch, brake and one-way clutch inside the A / T 6 and switches the shift state as necessary.
[0027]
Controls such as on / off switching of the electromagnetic clutch 10a, mode control of the M / G 26 and the inverter 28, power generation control in the power generation mode of the M / G 26, control of the starter 36, power storage amount control for the batteries 30 and 34, etc. It is executed by the eco-run ECU 40. Further, driving on / off of the auxiliary machine 22 excluding the water pump, driving control of the electric hydraulic pump 38, shift control of the A / T 6, fuel injection control by the fuel injection valve 42, opening control of the throttle valve 46 by the electric motor 44 The opening degree control of the exhaust gas recirculation (EGR) valve and other engine control are executed by the engine ECU 48.
[0028]
The eco-run ECU 40 inputs the rotation speed of the rotation shaft of the M / G 26 from the rotation speed sensor built in the M / G 26, whether the driver has started the eco-run system, and other data from the eco-run switch. The eco-run system is an operation control system that reduces fuel consumption and stops exhaust gas emission by stopping fuel supply and stopping the engine 2 when the vehicle is stopped at an intersection or the like.
[0029]
Further, the engine ECU 48 detects the engine coolant temperature THW from the water temperature sensor, the accelerator opening ACCP from the accelerator opening sensor, the steering angle θ of the steering from the steering angle sensor, the vehicle speed SPD from the vehicle speed sensor, the throttle opening TA from the throttle opening sensor, Shift position SHFT from shift position sensor, engine speed NE from engine speed sensor, intake pressure PM from intake pressure sensor, operating condition from auto air conditioner, air-fuel ratio A / F appearing in exhaust component from air-fuel ratio sensor, and other data It is detected for engine control.
[0030]
Each of these ECUs 40 and 48 is configured with a microcomputer at the center, and the CPU executes necessary arithmetic processing in accordance with a program written in an internal ROM, and executes various controls based on the calculation results. ing. These arithmetic processing results and the data detected as described above can be exchanged by communicating with each other between the ECUs 40 and 48, and control can be executed in conjunction with each other. Yes.
[0031]
The eco-run ECU 40 executes an automatic stop process to automatically stop the engine 2 when an automatic stop condition is satisfied, such as after the start of the engine 2 by a starter switch or when the vehicle stops due to a signal waiting at an intersection. To do. During the automatic stop of the engine 2, the electromagnetic clutch 10a is disconnected, and the M / G 26 is driven using the electrical energy stored in the high-voltage power supply battery 30 in response to an air conditioner drive request or a power steering drive request. Let the air conditioner compressor and power steering pump rotate. Further, when the automatic start condition is established during such automatic stop, the automatic start process is executed to connect the electromagnetic clutch 10a, and the M / G 26 using the electric energy of the high-voltage power supply battery 30 is connected. The vehicle is started by driving and the engine 2 is automatically started.
[0032]
During the automatic stop process of the engine 2, the eco-run ECU 40 operates the vehicle, for example, the engine cooling water temperature THW detected by the water temperature sensor, the presence or absence of depression of the accelerator pedal detected by the idle switch, the voltage of the high-voltage power supply battery 30 Whether or not the automatic stop condition is satisfied is determined based on whether or not the brake pedal is depressed detected from the brake switch and the vehicle speed SPD obtained by conversion from the detection value of the output shaft rotational speed sensor. For example, (1) the engine 2 is warmed up and not overheated (the engine cooling water temperature THW is lower than the water temperature upper limit value THWmax and higher than the water temperature lower limit value THWmin), and (2) the accelerator pedal is depressed. State (idle switch on), (3) state of charge (SOC) of battery 30 for high-voltage power supply being over a certain level (battery voltage is above reference voltage), (4) state where brake pedal is depressed (Brake switch on), and (5) Automatic stop condition is satisfied when all conditions (1) to (5) are satisfied (the vehicle speed SPD is 0 km / h). It is determined that
[0033]
On the other hand, when the driver stops the vehicle at an intersection or the like and the automatic stop condition is satisfied, the eco-run ECU 40 executes an engine stop process. For example, fuel injection from the fuel injection valve 42 is stopped, and ignition control for the air-fuel mixture in the combustion chamber of the engine 2 by the ignition plug is also stopped. As a result, fuel injection and ignition stop, and the operation of the engine 2 immediately stops.
[0034]
During the automatic start process of the engine 2, the eco-run ECU 40 is in the operating state of the vehicle, here, for example, the same as the data read in the automatic stop process, the engine coolant temperature THW, the accelerator opening ACCP, the voltage of the high-voltage power supply battery 30, It is determined whether or not an automatic start condition is established based on the state of the brake switch, the vehicle speed SPD, and the like. For example, under the condition that the engine is stopped by the automatic stop process, (1) the engine 2 is warmed up and not overheated (the engine cooling water temperature THW is lower than the water temperature upper limit value THWmax and the water temperature (2) state in which accelerator pedal is not depressed (idle switch on), (3) state in which charge amount (SOC) of battery 30 for high voltage power supply is above a certain level (battery voltage is a reference) (Voltage over voltage), (4) the condition that the brake pedal is depressed (brake switch on), and (5) the vehicle is stopped (vehicle speed SPD is 0 km / h) If any one of (5) is not satisfied, it is determined that the automatic start condition is satisfied. The automatic start conditions (1) to (5) described above are the same as the conditions used in the automatic stop condition. However, the conditions are not limited to these, and conditions other than the conditions (1) to (5) May be set. Moreover, you may narrow down to some of conditions (1)-(5).
[0035]
When any one of the above conditions (1) to (5) is not satisfied in the engine stop state by the automatic stop process, the eco-run ECU 40 performs the automatic start process of the engine 2. In the automatic start process, the eco-run ECU 40 connects the electromagnetic clutch 10a, outputs a current command to the inverter 28, and rotates the M / G 26 to crank the engine 2. When the engine rotation speed reaches a predetermined rotation speed during the cranking, the engine ECU 48 executes a fuel injection process and an ignition timing control process at the time of starting to automatically start the engine 2. When the start of the engine 2 is completed, the engine ECU 48 starts normal fuel injection amount control processing, ignition timing control processing, and other processing necessary for engine operation.
[0036]
In the operating state of the engine 2, the eco-run ECU 40 connects the electromagnetic clutch 10 a and rotates the M / G 26 with the rotational power of the engine 2 to generate power. At this time, the eco-run ECU 40 calculates a required power generation amount according to the state of charge (SOC) of the battery 30 and outputs a power generation command according to the required power generation amount to the inverter 28. Based on this power generation command, the power generation amount of the M / G 26 is controlled by the inverter 28, and the battery 30 is charged by the generated power. In the power generation in the M / G 26, an excitation current as a power generation command is supplied to the rotor side, and generated power corresponding to the excitation current and the rotation speed of the M / G 26 is taken out from the stator side.
[0037]
Next, the power generation control process executed by the eco-run ECU 40 will be described in detail.
In the power generation control by the M / G 26, the eco-run ECU 40 basically feeds back the power generation voltage of the M / G 26, that is, the terminal voltage of the high-voltage power supply battery 30 to a predetermined target voltage. However, since it is necessary to limit the heat generated by the power generation of the M / G 26, the eco-run ECU 40 provides a power upper limit value for the power generated by the M / G 26.
[0038]
As shown in FIG. 3A, in the power generation by the M / G 26, the terminal voltage Vn of the high-voltage power supply battery 30 takes a value near the target voltage Vt. In this case, the acceptability of the current of the high-voltage power supply battery 30 is low, but the convergence of the terminal voltage Vn to the target voltage Vt is good. Therefore, by setting the target voltage control as the power generation control of the M / G 26, the terminal voltage Vn of the high-voltage power supply battery 30 can be easily converged to the target voltage Vt. At this time, the generated power of the M / G 26 becomes a value less than the power upper limit value, so that the heat generation of the M / G 26 can be suppressed.
[0039]
On the other hand, as shown in FIG. 3B, when the acceptability of the high-voltage power supply battery 30 becomes high because the remaining amount of the high-voltage power supply battery 30 is exhausted, the power generation of the M / G 26 is near the upper limit value. Will be performed continuously. As a result, the terminal voltage Vn cannot reach the target voltage Vt and becomes lower than the target voltage Vt.
[0040]
Therefore, in order to speed up the recovery of the high-voltage power supply battery 30, it is better to set the target power control as the power generation control of the M / G 26 so that the power generated by the M / G 26 becomes constant. In this target power control, feedback control is performed using the power upper limit value as the target power and the generated power as a parameter and using the excitation current as the control amount. When the power generation control of the M / G 26 is switched to the target power control, the power generation state changes from the state shown in FIG. 3B as shown in FIG. 4A, and the generated power is always a value near the power upper limit value. Therefore, the power generation capacity of the M / G 26 can be used to the maximum extent within an allowable range. Switching to the target power control of the power generation control of M / G 26 is determined that the state where the generated power Wn exceeds the target power Wt and the terminal voltage Vn is less than the target voltage Vt continues for a predetermined time Ta or more. It can be done at the time.
[0041]
Further, in the state where the power generation control of the M / G 26 is executed by the target power control, as shown in FIG. 4B, the terminal voltage Vn of the high-voltage power supply battery 30 reaches the target voltage Vt or reaches the target voltage Vt. When the value becomes sufficiently close, the power generation control of the M / G 26 is switched to the target voltage control. Thus, by switching the power generation control of the M / G 26 to the target voltage control again, the terminal voltage Vn of the high-voltage power supply battery 30 can be easily converged to the target voltage Vt.
[0042]
FIG. 2 is a flowchart showing a power generation control process executed by the eco-run ECU 40. This process is a process that is repeatedly executed periodically every preset short time during operation of the engine 2 and deceleration of the vehicle.
[0043]
When this process is started, first, in step 100, it is determined whether or not the power control flag is ON. This power control flag is a flag for switching the feedback control of the generated voltage of the M / G 26 to the target power control. If it is determined that the power control flag is OFF (“NO” in step 100), the process proceeds to step 110. If it is determined that the power control flag is ON (“YES” in step 100), the process is performed. Proceeds to step 140.
[0044]
In step 110, the power generation control of the M / G 26 is set to the target voltage control, and the excitation current command value supplied to the rotor side of the M / G 26 is calculated based on the following equation. Based on the excitation current command value, the generated power of the M / G 26 is controlled.
[0045]
[Expression 1]
If = Pv * (Vt−Vn) + Iv * Σ (Vt−Vn)
If: Excitation current command value to M / G26
Pv: Proportional coefficient during voltage control
Iv: Integration coefficient during voltage control
Vt: target voltage
Vn: Current voltage (battery terminal voltage)
In step 120 following step 110, it is determined whether a condition for switching the power generation control of the M / G 26 to the target power control is satisfied. Here, (1) the target power Wt is less than the generated power Wn, (2) the target voltage Vt is greater than the terminal voltage Vn, and (3) the target power Wt is less than the generated power Wn and the target voltage Vt. It is determined that the switching condition is satisfied when all of the conditions (1) to (3) that the duration Tw during which the voltage exceeds the terminal voltage Vn is equal to or longer than the predetermined time Ta are satisfied. If it is determined in step 120 that the condition for switching to the target power control is satisfied, the process proceeds to step 130, and if not, this routine is temporarily terminated.
[0046]
In step 130, the power control flag is set to ON, and the process proceeds to step 140.
In step 140 following step 100 and step 130, the power generation control of M / G 26 is set to target power control, and the excitation current command value supplied to the rotor side of M / G 26 is calculated based on the following equation. Based on the excitation current command value, the generated power of the M / G 26 is controlled.
[0047]
[Expression 2]
If = Pw * (Wt−Wn) + Iw * Σ (Wt−Wn)
If: Excitation current command value to M / G26
Pw: Proportional coefficient during power control
Iw: Integration coefficient during power control
Wt: target power
Wn: Generated power
In the next step 150, it is determined whether or not the condition for switching the power generation control of the M / G 26 to the target voltage control, that is, the condition for ending the target power control is satisfied. Here, (1) the condition that the terminal voltage Vn is equal to or higher than the target voltage Vt, and (2) the conditions (1) and (2) that the duration Tv where the terminal voltage Vn is equal to or higher than the target voltage Vt is equal to or longer than the predetermined time Tb, When both of the conditions 2) are satisfied, it is determined that the condition for switching to the target voltage control is satisfied. If it is determined in step 150 that the condition for switching to the target voltage control is satisfied, the process proceeds to step 160, and if not, this routine is temporarily terminated.
[0048]
In step 160, the power control flag is set to OFF, and this process is temporarily terminated.
According to the embodiment described above, the following effects can be obtained.
[0049]
In this embodiment, the eco-run ECU 40 controls the M / G 26 so that the generated voltage becomes a predetermined target value during power generation. However, if the convergence of the generated voltage to the target value decreases, the target of the M / G 26 The power generation target is switched so as to perform power feedback control for controlling the power to a predetermined value. Therefore, the M / G 26 can be operated to the maximum within the allowable power generation capacity, the power generation voltage of the M / G 26 can be quickly converged to the target value, and the high-voltage power supply battery 30 can be quickly Can be charged.
[0050]
In this embodiment, the eco-run ECU 40 has the convergence of the generated voltage to the target value based on the fact that the state where the difference between the predetermined target value and the actual generated voltage value is equal to or greater than the predetermined value has continued for a predetermined time or longer. Decrease can be determined.
[0051]
In the present embodiment, the eco-run ECU 40 automatically stops the engine 2 while the vehicle is stopped, and automatically restarts the engine 2 with the electric power from the high-voltage power supply battery 30 when the stop control end condition is satisfied. ing. The eco-run ECU 40 prohibits the automatic stop of the engine 2 when the remaining amount of the high-voltage power supply battery 30 is less than or equal to a predetermined value. However, the amount of charge of the high-voltage power supply battery 30 can be set to a predetermined target value at an early stage. The period during which the automatic stop control 2 can be executed can be lengthened.
[0052]
The embodiment can be modified as follows.
(A) In the above embodiment, feedback control is performed so that the power generation voltage of the M / G 26 becomes a predetermined target voltage in the power generation control by the M / G 26, but the power generation current supplied to the load by the M / G 26 is a predetermined target. You may make it perform feedback control so that it may become a value.
[0053]
The power generation control process in this case executed by the eco-run ECU 40 will be described in detail. In the power generation control by the M / G 26, the eco-run ECU 40 basically performs feedback so that the power generation current of the M / G 26, that is, the output current of the M / G 26 becomes a predetermined target current. However, since it is necessary to limit the heat generated by the power generation of the M / G 26, the eco-run ECU 40 provides a power upper limit value for the power generated by the M / G 26.
[0054]
As shown in FIG. 6A, in the power generation by the M / G 26, the power generation current In of the M / G 26 takes a value in the vicinity of the target current It. Therefore, the convergence of the power generation current In to the target current It is good. . Therefore, by setting the target current control as the power generation control of M / G 26, the power generation current In of M / G 26 can be easily converged to the target current It. At this time, the generated power of the M / G 26 becomes a value less than the power upper limit value, so that the heat generation of the M / G 26 can be suppressed.
[0055]
On the other hand, as shown in FIG. 6B, in the power generation by the M / G 26, when the difference between the power generation current In of the M / G 26 and the target current It is large, the power generation of the M / G 26 is the power upper limit value. It will be performed continuously in the vicinity. As a result, the generated current In cannot reach the target current It and is always lower than the target current It.
[0056]
Therefore, in order to stabilize the generated current In of the M / G 26, it is better to set the target power control as the power generation control of the M / G 26 so that the generated power becomes constant. In this target power control, feedback control is performed using the power upper limit value as the target power and the generated power as a parameter and using the excitation current as the control amount. When the power generation control of the M / G 26 is switched to the target power control, the power generation state changes from the state shown in FIG. 6B as shown in FIG. 7A, and the generated power is always a value near the power upper limit value. Therefore, the power generation capacity of the M / G 26 can be used to the maximum extent within an allowable range. Switching to the target power control of the power generation control of M / G 26 is determined that the state where the generated power Wn exceeds the target power Wt and the generated current In is less than the target current It continues for a predetermined time Tc or longer. It can be done at the time.
[0057]
Further, in the state where the power generation control of the M / G 26 is executed by the target power control, as shown in FIG. 7B, the power generation current In of the M / G 26 reaches the target current It or is sufficiently close to the target current It. When the value is reached, the power generation control of the M / G 26 is switched to the target current control. Thus, by switching the power generation control of the M / G 26 to the target current control again, the power generation current In of the M / G 26 can be easily converged to the target current It.
[0058]
FIG. 5 is a flowchart showing the power generation control process executed by the eco-run ECU 40 in the above case. This process is a process that is repeatedly executed periodically every preset short time during operation of the engine 2 and deceleration of the vehicle.
[0059]
When this process is started, first, at step 200, it is determined whether or not the power control flag is ON. This power control flag is a flag for switching the feedback control of the generated current of the M / G 26 to the target power control. If it is determined that the power control flag is OFF (“NO” in step 200), the process proceeds to step 210. If it is determined that the power control flag is ON (“YES” in step 200), the process is performed. Proceeds to step 240.
[0060]
In step 210, the power generation control of the M / G 26 is set to the target current control, and the excitation current command value supplied to the rotor side of the M / G 26 is calculated based on the following equation. Based on the excitation current command value, the generated power of the M / G 26 is controlled.
[0061]
[Equation 3]
If = Pi * (It-In) + Ii * Σ (It-In)
If: Excitation current command value to M / G26
Pi: Proportional coefficient for current control
Ii: Integration coefficient during current control
It: target current
In: Current current
In step 220 following step 210, it is determined whether a condition for switching the power generation control of the M / G 26 to the target power control is satisfied. Here, (1) the target power Wt is less than the generated power Wn, (2) the target current It exceeds the generated current In, and (3) the target power Wt is less than the generated power Wn and the target current It It is determined that the switching condition is satisfied when all of the conditions (1) to (3) that the duration Ti during which the power generation current In exceeds the predetermined time Tc are satisfied. If it is determined in step 220 that the condition for switching to the target power control is satisfied, the process proceeds to step 230, and if not, this routine is temporarily terminated.
[0062]
In step 230, the power control flag is set to ON, and the process proceeds to step 240.
In Step 240 following Step 200 and Step 230, the power generation control of the M / G 26 is set to target power control, and the excitation current command value supplied to the rotor side of the M / G 26 is calculated based on the following equation. Based on the excitation current command value, the generated power of the M / G 26 is controlled.
[0063]
[Expression 4]
If = Pw * (Wt−Wn) + Iw * Σ (Wt−Wn)
If: Excitation current command value to M / G26
Pw: Proportional coefficient during power control
Iw: Integration coefficient during power control
Wt: target power
Wn: Generated power
In the next step 250, it is determined whether or not the condition for switching the power generation control of the M / G 26 to the target current control, that is, the condition for ending the target power control is satisfied. Here, (1) a condition in which the generated current In is equal to or greater than the target current It, and (2) conditions (1) and (1) that the duration Ti in which the generated current In is equal to or greater than the target current It is equal to or greater than the predetermined time Td. When both of the conditions 2) are satisfied, it is determined that the condition for switching to the target current control is satisfied. If it is determined in step 250 that the condition for switching to the target current control is satisfied, the process proceeds to step 260, and if not, this routine is temporarily terminated.
[0064]
In step 260, the power control flag is set to OFF, and the process is temporarily terminated.
According to the embodiment described above, the following effects can be obtained.
In the feedback control of the generated current of the M / G 26, the eco-run ECU 40 controls the M / G 26 so that the generated current becomes a predetermined target value during the power generation. When it decreases, the power generation target is switched so as to perform power feedback control for controlling the target power of the M / G 26 to a predetermined value. Therefore, the M / G 26 can be operated to the maximum within the allowable power generation capacity range, and the generated current of the M / G 26 can be converged to the target value at an early stage.
[0065]
In the present embodiment, the eco-run ECU 40 reduces the convergence of the generated current to the target value based on the fact that the state where the difference between the predetermined target value and the actual generated current is greater than or equal to the predetermined value has continued for a predetermined time or longer. Can be determined.
[0066]
(B) In the above embodiment, the vehicle is provided with an eco-run system in which the automatic start after the automatic stop of the engine 2 is performed by the M / G 26. However, the eco-run in which the automatic start of the engine 2 is automatically performed by the starter 36 is performed. You may embody in the vehicle provided with the system. Also in this case, the same operations and effects as described above can be obtained.
[0067]
(C) In the above embodiment, when the vehicle is stopped, the engine 2 is automatically stopped, and when the stop control end condition is satisfied, the engine 2 is automatically restarted by the M / G 26. Although implemented, you may implement in the electric power generation control of the generator in a normal vehicle.
[0068]
(D) In the above embodiment, the M / G 26 power generation control is performed in a vehicle equipped with the M / G 26 (generator) by the rotational force of the engine 2, but the power generation control of the power generator other than the vehicle may be performed. Good.
[0069]
Next, other technical ideas that can be grasped from the above embodiments will be described below.
5. The power generation control device for a generator according to claim 4, wherein the power generator includes a motor function that is operated by electric energy of the battery.
[0070]
9. The power generation control method for a power generator according to claim 8, wherein the power generator includes a motor function that is operated by electric energy of the battery.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram of an internal combustion engine and a control device thereof according to an embodiment.
FIG. 2 is a flowchart showing power generation control processing according to the embodiment.
FIG. 3 is an explanatory diagram illustrating an example of power generation control according to the embodiment.
FIG. 4 is an explanatory diagram illustrating an example of power generation control according to the embodiment.
The time chart which shows an example of control of embodiment.
FIG. 5 is a flowchart showing another example of power generation control processing.
FIG. 6 is an explanatory diagram showing an example of another example of power generation control.
FIG. 7 is an explanatory diagram showing an example of another example of power generation control.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 2 ... Engine, 2a ... Crankshaft, 4 ... Torque converter, 6 ... A / T, 6a ... Output shaft, 10 ... Pulley, 10a ... Electromagnetic clutch, 14 ... Belt, 16, 18 ... Pulley, 22 ... Auxiliary machine, 26 Motor generator (M / G) 28 Inverter 30 High-voltage power supply battery 34 Low-voltage power supply battery 36 Starter 40 Eco-run ECU 42 Fuel injection valve 44 Electric motor 46 Throttle Valve, 48 ... Engine ECU.

Claims (8)

A generator for supplying power to the load;
Feedback power generation control means for feeding back the generated voltage or generated current by the generator so as to become a predetermined target value;
Generated power control means for limiting the power generated by the generator to a predetermined power or lower;
Determination means for determining that the convergence to the target value has decreased during the operation of the feedback power generation control means;
Power generation switching means for switching the power generation target to perform power feedback control for controlling the target power of the generator to a predetermined value when the convergence is reduced;
A generator control device for a generator, comprising: The generator control device for a generator according to claim 1,
The determination means determines the decrease in convergence based on a state where a difference between the predetermined target value and an actual generated voltage value or generated current value is a predetermined value or more continues for a predetermined time or more. A generator control device for a generator. In the generator control apparatus of the generator in any one of Claim 1 and 2,
The power generation control device for a generator, wherein the load includes a battery for storing electric power generated by the generator. The generator control device for a generator according to claim 3,
The generator is rotated by an internal combustion engine mounted on a vehicle,
An eco-run control means for stopping the internal combustion engine while the vehicle is stopped and automatically restarting the internal combustion engine with electric power from the battery when a stop control end condition is satisfied;
The power generation control device for a generator, wherein the eco-run control means prohibits the automatic stop of the internal combustion engine when the remaining amount of the battery is below a predetermined value. A power generation control method for a generator that controls the power supplied to the load by feedback control of power generation by the generator,
A feedback step of feeding back the generated voltage or generated current by the generator so as to become a predetermined target value;
A power control step for limiting the power generated by the generator to a predetermined power or lower;
A determination step of determining that the convergence to the target value has decreased during the operation of the feedback step;
A power generation switching step of switching a power generation target so as to perform power feedback control for controlling the target power of the generator to a predetermined value when convergence to the target value is reduced during the operation of the feedback step;
A power generation control method for a generator. In the power generation control method of the generator according to claim 5,
The determination step includes determining the decrease in convergence based on a state where a difference between the predetermined target value and an actual generated voltage value or generated current value is equal to or greater than a predetermined value for a predetermined time or longer. A power generation control method for a generator. In the electric power generation control method of the generator in any one of Claim 5 and 6,
The power generation control method for a generator, wherein the load includes a battery for storing electric power generated by the generator. In the electric power generation control method of the generator according to claim 7,
The generator is rotated by an internal combustion engine mounted on a vehicle,
An eco-run control means for stopping the internal combustion engine while the vehicle is stopped and automatically restarting the internal combustion engine with electric power from the battery when a stop control end condition is satisfied;
The power generation control method for a generator, wherein the eco-run control means prohibits the automatic stop of the internal combustion engine when the remaining amount of the battery is below a predetermined value.

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