JP2020137196A - Motor control device and motor control method - Google Patents

Abstract

To provide a motor control device and a motor control method which can promptly initiate a motor according to a state while precharging.SOLUTION: A motor control device 10 includes: a main power line 6 which supplies power to a motor 1; a capacitor 9 provided at the former stage of the motor 1; and a precharge line 8 which charges the capacitor 9. An FET 24 is provided on the precharge line 8, and the FET 24 is controlled by an FET control circuit 26. The charge voltage of the capacitor 9 is detected by a capacitor voltage detection circuit 25. A charging time control unit 27 controls the FET 24 based on the voltage of the capacitor 9, to change the precharge time of the capacitor 9 according to a motor state, so as to decrease a precharge wait time to promptly start the motor.SELECTED DRAWING: Figure 1

Description

The present invention relates to a start control technique for an electric motor, and more particularly to a technique applicable to a vehicle motor such as an automobile engine starter generator (ISG).

In vehicles such as automobiles, various electric motors are used for starting an engine, driving a radiator fan, and the like. Among them, for example, in the motor for starting an engine, a device called ISG that integrates the functions of a starter and a generator has appeared in recent years. In addition, in an in-vehicle motor such as an ISG motor, in order to prevent a large current from flowing suddenly at the time of starting, a system in which a capacitor is arranged in front of the motor and the capacitor is precharged at the time of starting the motor is precharged. Is often seen. In the motor that performs this precharging, first, the capacitor is charged while suppressing the current by a precharging circuit provided separately from the motor drive circuit. Then, after charging the capacitor, the contactor of the motor drive circuit is turned on to drive the motor.

FIG. 4 is an explanatory diagram showing a configuration of a drive system for an ISG motor. In the drive system of FIG. 4, the motor 51 is driven by the ISG driver 53 under the command of the upper ECU (Engine Controller Unit) 52. A drive current is supplied to the ISG driver 53 from the battery 54 via a main power supply line 56 provided with a contactor 55. A precharge line 57 is provided between the battery 54 and the motor 51 in addition to the main power supply line 56. Further, a capacitor 58 is arranged in front of the motor 51.

In such a system, when the key switch 59 is turned on and the accessory (ACC) position is reached, the ECU 52 that detects it first turns on the relay 61 of the precharge line 57. When the relay 61 is turned on, the precharge line 57 becomes conductive and the capacitor 58 is charged. At this time, a current is supplied to the capacitor 58 via the limiting resistor 62, and the capacitor 58 is gradually charged at a low current. When the key switch 59 reaches the ignition (IG) position after the capacitor 58 is charged, the ECU 52 that detects it turns on the contactor 55. As a result, the main power supply line 56 becomes conductive and the motor 51 is driven. At that time, power is also supplied to the motor 51 from the capacitor 58, and it is possible to suppress a sudden large current (inrush current) from flowing to the main power supply line 56, stabilize the power supply, and contact the contactor 55. Deterioration is also suppressed.

Japanese Unexamined Patent Publication No. 2015-208068

However, in the drive system as shown in FIG. 4, the precharge line 57 for the capacitor 58 has a circuit configuration in which a diode and a limiting resistor 62 are provided, and the precharge time for the capacitor 58 cannot be changed. Therefore, there is a certain precharge time when the motor is started, and even if the motor is to be operated quickly, a precharge waiting time is generated between the ignition switch ON and the motor start. That is, even if the key switch 59 is operated from the ACC position to the IG position immediately, the engine is not started during the precharge. Further, if the driver leaves the key switch 59 in the ACC position for a while after the switch is turned on, such as when the key switch 59 is set to the ACC position and only the audio is operated without starting the engine, the capacitor 58 is gradually discharged. It ends up. Therefore, after that, even if the key switch 59 is set to the IG position, a time for recharging the capacitor 58 is required before starting the engine, and a time for waiting for precharge also occurs. Such a time lag due to waiting for pre-charge gives the driver a feeling that the engine start is delayed, and there is a problem that the commercial value of the automobile may be deteriorated.

An object of the present invention is to provide a motor control device and a motor control method capable of quickly starting a motor according to a situation while performing precharging.

The motor control device of the present invention is provided separately from the main power supply circuit that supplies power to the electric motor, the capacitor connected to the main power supply circuit and provided in front of the electric motor, and the main power supply circuit. A motor control device including a precharge circuit for charging the capacitor, wherein the control device includes a switching element provided in the precharge circuit and a capacitor voltage detection circuit for detecting the charge voltage of the capacitor. , The switching element control circuit that controls the operation of the switching element and the switching element control circuit that controls the switching element control circuit based on the voltage of the capacitor detected by the capacitor voltage detection unit to control the charging time of the capacitor. It is characterized by having a time control unit.

In the present invention, a switching element is arranged in the precharge circuit, and the charging time control unit controls the switching element based on the voltage of the capacitor to control the charging time of the capacitor. The charging time can be changed according to the condition of the motor. Therefore, for example, when the motor is used for ISG, even if the key switch is immediately operated from the ACC position to the IG position or the key switch is left at the ACC position, it is used for ISG depending on the state. It is possible to start the motor quickly and start the engine without a time lag.

In the motor control device, the main power supply circuit is provided with a first switch unit for opening and closing the circuit, and the precharge circuit is provided with a second switch unit for opening and closing the circuit, and the charging time control unit is provided with the first switch unit. 2 When the switch is turned on, the normal charging mode of charging the capacitor in a predetermined normal set time is performed, while when the first switch unit is turned on within the normal set time, the switching element is controlled. A charging time adjusting unit may be provided to increase the current of the precharging circuit and perform a charging shortening mode for completing charging of the capacitor earlier than the normal set time.

Further, the charging time adjusting unit shows the relationship between the elapsed time after the second switch is turned on and the control mode of the switching element when the first switch unit is turned on within the normal set time. The switching element may be controlled by the switching element control circuit based on the control map. The charging time adjusting unit may increase the current of the precharge circuit within a range of 95% or less of the allowable current of the switching element after the first switch unit is turned on.

Further, when the first switch unit is turned on beyond the normal set time, the charging time adjusting unit may execute the charging shortening mode based on the voltage of the capacitor. In this case, the charging time adjusting unit is based on a control map showing the relationship between the voltage of the capacitor and the control mode of the switching element when the first switch unit is turned on beyond the normal set time. The switching element may be controlled by the switching element control circuit.

In the motor control device, the electric motor may be a motor for starting an engine of an automobile. At that time, the first switch unit is turned on when the key switch of the automobile is in the ignition position, and the second switch is turned on. The unit may be turned on when the key switch of the automobile is in the accessory position.

In addition, the charging time control unit controls the capacitance change determination unit that detects the capacitance change of the capacitor and the switching element based on the change in the capacitance of the capacitor, and is usually determined regardless of the capacitance of the capacitor. A charging time correction unit may be provided to complete charging of the capacitor at a set time. In this case, the charging time correction unit may control the switching element by the switching element control circuit based on a control map showing the relationship between the capacity of the capacitor and the control form of the switching element.

Further, an FET may be used as the switching element, and the FET may be controlled by PWM duty or source follower by a switching element control circuit.

On the other hand, in the motor control method of the present invention, the main power supply circuit that supplies power to the electric motor, the capacitor connected to the main power supply circuit and provided in front of the electric motor, and the main power supply circuit are separate. It is a control method of a motor provided with a precharge circuit for charging the capacitor, wherein a switching element is provided in the precharge circuit, a charging voltage of the capacitor is detected, and the precharge circuit is based on the voltage of the capacitor. It is characterized in that the charging time of the capacitor is controlled by controlling the switching element.

In the present invention, a switching element is arranged in the precharge circuit, the switching element is controlled based on the voltage of the capacitor, and the charging time of the capacitor is controlled. Therefore, the precharging time of the capacitor is determined by the state of the motor. It can be changed according to. Therefore, for example, when the motor is used for ISG, even if the key switch is immediately operated from the ACC position to the IG position or the key switch is left at the ACC position, it is used for ISG depending on the state. It is possible to start the motor quickly and start the engine without a time lag.

In the motor control method, the main power supply circuit is provided with a first switch unit for opening and closing the circuit, the precharge circuit is provided with a second switch unit for opening and closing the circuit, and when the second switch is turned on, the above. While performing a normal charging mode in which the capacitor is charged in a predetermined normal set time, when the first switch unit is turned on within the normal set time, the switching element is controlled to control the current of the precharge circuit. May be implemented in a charge shortening mode in which charging of the capacitor is completed earlier than the normal set time.

Further, in the motor control method, when the first switch unit is turned on beyond the normal set time, the charge shortening mode may be executed based on the voltage of the capacitor.

Further, the electric motor may be a motor for starting an engine of an automobile, in which case the first switch portion is turned on when the key switch of the automobile is in the ignition position, and the second switch portion is the said. The key switch of the car may be turned on when it is in the accessory position.

In addition, the change in the capacitance of the capacitor is detected, the switching element is controlled based on the change in the capacitance of the capacitor, and the charging of the capacitor is completed in a predetermined normal set time regardless of the capacitance of the capacitor. You can do it.

According to the motor control device of the present invention, a switching element is arranged in a capacitor precharge circuit provided in front of the motor, and the switching element is controlled based on the voltage of the capacitor to control the charging time of the capacitor. Since the portion is provided, the precharge time of the capacitor can be changed according to the condition of the motor. Therefore, it is possible to start the motor quickly according to the usage state of the motor.

According to the motor control method of the present invention, a switching element is arranged in a capacitor precharge circuit provided in front of the motor, and the switching element is controlled based on the voltage of the capacitor to control the charging time of the capacitor. , The precharge time of the capacitor can be changed according to the condition of the motor. Therefore, it is possible to start the motor quickly according to the usage state of the motor.

It is explanatory drawing which shows the system structure of the motor control device which is one Embodiment of this invention. It is a flowchart which shows the flow of the control process when a key switch is operated. It is explanatory drawing which shows the precharge form when a key switch is operated, (a) is the control form when shortening a precharge time, (b) is the control form when it corresponds to the aging of a capacitor, (c). Indicates the control mode when the capacitor voltage drops after the key switch is operated to the ACC position. It is explanatory drawing which shows the structure of the drive system of the conventional ISG motor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing a system configuration of a motor control device 10 according to an embodiment of the present invention, and the motor control method of the present invention is also implemented in the system. The control device of FIG. 1 is used for an ISG motor of an automobile, and drives and controls the motor 1 according to the operating state of a key switch. After starting the engine, the motor 1 operates as a generator as appropriate.

As shown in FIG. 1, in the motor control device 10, the motor 1 is also driven by the ISG driver 3 under the command of the upper ECU 2. A drive current is supplied to the ISG driver 3 from the battery 4 via a main power supply line (main power supply circuit) 6 provided with a contactor 5. Further, a precharge line (precharge circuit) 8 provided with a relay 7 is provided between the battery 4 and the motor 1 in addition to the main power supply line 6. The operations of the relay 7 and the contactor 5 are controlled by the ECU 2. A capacitor 9 is arranged in front of the motor 1 as in the system of FIG. The motor 1 is started while precharging the capacitor 9 in response to the operation of the key switch 11 by the driver. In the motor control device 10 according to the present invention, the precharge time of the capacitor 9 is variable, and even when the key switch 11 is immediately operated from the ACC position to the IG position, the precharge time is shortened. Achieves quick engine start.

The ECU 2 is connected to the key switch 11, and a key switch input circuit 12 for detecting the operation position of the key switch 11 is provided in the ECU 2. The key switch input circuit 12 detects whether the key switch 11 is currently in the position of OFF, accessory (ACC), or ignition (IG). Further, the ECU 2 is provided with a relay drive circuit 13 for operating the relay 7 and a contactor drive circuit 14 for operating the contactor 5.

When the relay drive circuit 13 detects that the key switch 11 has been operated to the ACC position by the key switch input circuit 12, the relay drive circuit 13 operates the relay 7 (ON) and conducts the precharge line 8 (ON). When the contactor drive circuit 14 detects that the key switch 11 has been operated to the IG position by the key switch input circuit 12, the contactor 5 is operated (ON) and the main power line 6 is made conductive (ON). Further, the ECU 2 is provided with a CAN (Controller Area Network) communication circuit 15, and various information such as the operating status of the contactor 5 is exchanged with the ISG driver 3 via the CAN communication circuit 15.

The ISG driver 3 is also connected to the key switch 11 like the ECU 2, and the ISG driver 3 is provided with a key switch input circuit 21 for detecting the operation position of the key switch 11. The key switch input circuit 21 detects whether the key switch 11 is currently in the OFF, accessory (ACC), or ignition (IG) position. Further, the ISG driver 3 is also provided with a CAN communication circuit 22, which is connected to the CAN communication circuit 15 of the ECU 2.

On the other hand, in the motor control device 10, the ISG driver 3 is provided with an FET (switching element) 24 that controls the amount of current in the precharge line 8 in addition to the limiting resistor 23. Further, the ISG driver 3 includes a capacitor voltage detection circuit 25 that detects the charging voltage of the capacitor 9, and an FET control circuit (switching element control circuit) 26 that controls the operation of the FET 24 and adjusts the amount of current in the precharge line 8. , A charging time control unit 27 that controls the FET control circuit 26 and adjusts the charging time of the capacitor 9 is provided. Further, the ISG driver 3 is provided with a memory 28 for storing data and a timer 29 for timing. The memory 28 stores a control map 30 relating to charge control of the capacitor 9.

In such a motor control device 10, the following control processing is performed in association with the operation of the key switch 11. FIG. 2 is a flowchart showing the flow of control processing when the key switch 11 is operated, FIG. 3 is an explanatory diagram showing a precharge form at that time, and FIG. 3A is a case where the precharge time is shortened. , (B) show the control mode when the capacitor corresponds to the aging of the capacitor, and (c) show the control mode when the capacitor voltage drops after the key switch 11 is operated to the ACC position. As shown in FIG. 2, in the motor control device 10, when the key switch 11 is operated, the key switch input circuits 12 and 21 detect that the switch is in the ACC position (step S1).

When the key switch 11 reaches the ACC position, the relay drive circuit 13 turns on the relay 7 of the precharge line 8 based on the detection information from the key switch input circuit 12, and starts precharging the capacitor 9 (step S2). .. At this time, the ISG driver 3 side controls the gate voltage of the FET 24 by the capacitor voltage detection circuit 25 under the instruction of the charging time control unit 27 based on the detection information from the key switch input circuit 21. The gate voltage is controlled by PWM duty control. As a result, the voltage of the capacitor 9 gradually rises, and the amount of current in the precharge line 8 is controlled so that charging is completed within a predetermined normal set time Tc (see FIG. 3A) (normal charging). mode).

When the precharge is started, the voltage of the capacitor 9 is detected by the capacitor voltage detection circuit 25. The charging time control unit 27 performs a capacitance determination process of the capacitor 9 based on the detected capacitor voltage (step S3). The capacitance determination process is performed by comparing the detected capacitor voltage with the capacitor capacitance determination threshold value Vs by the capacitance change determination unit 31 provided in the charging time control unit 27. The capacitance determination threshold value Vs is set to a voltage lower than the voltage at the completion of charging of the capacitor 9, and is stored in the memory 28 in advance.

Here, when the capacitance of the capacitor 9 changes (decreases) from the initial state due to aged deterioration or temperature change, as shown by the broken line in FIG. 3 (b), the time from the start of precharging to the threshold value Vs ( Threshold arrival time) Ts becomes shorter than the initial value T0 (T0 → T1). Therefore, the capacity change determination unit 31 compares the current threshold value arrival time with the threshold value arrival time initial value T0 in the threshold value arrival time comparison unit 32. Then, the charging time correction unit 33 adjusts the current amount of the precharging line 8 and charges the capacitor 9 based on the relationship between the two so that the charging process is completed within the normal set time Tc even when the capacity of the capacitor 9 is reduced. Correct the time (step S3). Such correction processing is performed based on the capacity change correction map 34 stored in advance in the memory 28. In the capacitance change correction map 34, for example, the duty ratio of the FET 24 at that time is described with the ratio (T1 / T0) and the difference (T0-T1) of T1 and T0 as parameters.

For example, in FIG. 3B, when the capacitance of the capacitor 9 decreases and the capacitance determination threshold value Vs is reached in the time T1 (T1 / T0 = 0.8), the normal charging process is performed as it is. , Charging is completed in a shorter time than Tc. Therefore, the charging time control unit 27 reduces the amount of current in the precharge line 8 from the initial setting by the charging time correction unit 33 based on the determination result in the capacitance change determination unit 31, and charges the capacitor 9 for a long time. Complete with Tc. That is, the duty ratio of the FET 24 is lowered, the slope of the charging characteristic line shown in FIG. 3B is reduced, and Ts is adjusted to T0 (returning from the broken line to the solid line). In the normal charging process in a state where there is no change over time, the map value when T1 / T0 = 1 (the normal set value at which the precharge time is the normal set time Tc) is applied, and FIGS. The charging process shown by the solid line in b) is carried out.

As described above, in the motor control device 10, even if the capacity of the capacitor 9 changes due to aged deterioration or temperature change, the engine can be started with the same precharge time (normal set time Tc). Therefore, the time from the operation of the key switch to the start of the engine is always the same, and the engine start feeling felt by the driver is always the same. For this reason, it is possible to suppress fluctuations in the sense of time such as quick engine start-up or sluggishness due to aging and temperature, and it is possible to reduce extra stress on the driver at the time of engine start-up. In addition, it is possible to deal with variations in the product of the capacitor 9 itself and changes in capacity before and after replacement when the capacitor 9 is replaced, and even in those cases, it is possible to always start the engine with the same precharge time. Become.

In step S3, when there is a capacitance change in the capacitor 9, the charging time is corrected, and the elapsed time from the start of precharging is timed by the timer 29 to check whether the normal set time Tc has elapsed. Confirm (step S4). If the normal set time Tc has not elapsed, the process proceeds to step S5, and it is confirmed whether or not the key switch 11 is operated to the IG position. At this time, if the IG position is not reached, the process returns to step S4, waits for the elapse of the normal set time Tc, and when the normal set time Tc is reached, it is determined that the precharge is completed (step S6) to prepare for engine start.

If the key switch 11 is operated to the IG position in step S5 even though the normal set time Tc has not elapsed, the process proceeds to step S7 to shorten the precharge time (charge shortening mode). To carry out. As described above, in the conventional ISG, the precharge time cannot be changed. Therefore, when the ignition is turned on within the normal set time Tc, a precharge waiting time occurs before the motor starts. In that respect, in the motor control device 10 of the present invention, in such a case, the charging time adjusting unit 35 provided in the charging time control unit 27 shortens the precharging time and promptly starts the engine. That is, the charging time adjusting unit 35 controls the capacitor voltage detection circuit 25 based on the precharging time adjusting map 36 stored in advance in the memory 28, and increases the current amount of the precharging line 8 from the initial setting. , The charging is completed earlier than the normal set time Tc.

In this case, since the time from that point to the completion of charging differs depending on the elapsed time Tk from the start of precharging, the charging completion time is set to a desired value in the precharging time adjustment map 36 with the elapsed time Tk as a parameter. The duty ratio of the FET 24 is described. Here, for example, in FIG. 3A, when the ignition is turned on at the time T2 (Tk = T2) before the normal set time Tc, the solid line precharge is performed in the conventional ISG, and the normal setting is performed. After the time Tc has elapsed, the motor 1 is driven and the engine is started. Therefore, the period from time T2 to Tc is the time for waiting for precharge.

On the other hand, in the motor control device 10, when the ignition is turned on at the time T2, the precharge time shortening process in step S7 is performed, the duty ratio of the FET 24 is increased, and the capacitor 9 is rapidly charged. That is, the slope of the normal charging characteristic line shown by the solid line in FIG. 3A is increased, the elapsed time Tk is shortened to T3, and the precharge waiting time is shortened. However, the amount of current during quick charging is kept within the allowable current range of the FET 24, preferably about 90 to 95%, to prevent deterioration of the element. Therefore, even when the key switch 11 is immediately operated from the ACC position to the IG position, the time for waiting for precharge can be shortened, the engine can be started quickly, and the time lag until the start of engine start can be reduced. As a result, the stress of the driver due to waiting for precharge can be reduced, the reactivity of the key switch is enhanced, and the commercial value of the automobile can be improved.

On the other hand, after the normal set time Tc has elapsed and the precharge is completed in step S6, the voltage of the capacitor 9 is monitored by the capacitor voltage detection circuit 25 (step S8). This assumes that the driver is operating only the audio without starting the engine after setting the key switch 11 to the ACC position, and if left as it is, the capacitor 9 will gradually discharge. To deal with that. As described above, if the key switch 11 is turned on after being left unattended, a time lag will occur by the amount of time for recharging. Therefore, in the motor control device 10, the voltage of the capacitor 9 is constantly monitored even after the precharge is completed (S8), and if the ignition ON is detected after that (step S9), the recharge time for the discharged amount is shortened. (Step S10), and then the motor 1 is operated (step S11).

In this case, when the charging time control unit 27 acquires the information that the key switch 11 has been operated to the IG position from the key switch input circuit 21, the charging time correction unit 33 performs the precharging time shortening process (charging shortening mode: S10) is carried out. Similar to the shortening process in step S7, the precharging time shortening process in step S10 also rapidly charges the capacitor 9 with a larger inclination than the normal charging characteristic line (solid line in FIG. 3C). That is, for example, when the capacitor voltage drops from Vc at the time of full charge to V1, as shown in FIG. 3C, it becomes like a solid line in the normal charging process, and the time lag becomes large (T4). On the other hand, when the process of step S10 is performed, the charge process is performed as shown by the broken line in FIG. 3 (c) as in the case of step S7, and the precharge time is shortened (T4 → T5). The process of step S10 is performed when the capacitor voltage has dropped to some extent (for example, less than 80%) from the time of full charge, and when the voltage drop is small, the process proceeds to step S11 as it is to operate the motor 1. ..

In the precharge time shortening process in step S10, the charge time correction unit 33 controls the capacitor voltage detection circuit 25 based on the recharge time adjustment map 37 stored in advance in the memory 28, and sets the time until charging is completed. Shorten. In the recharge time adjustment map 37, the duty ratio of the FET 24 for setting the time from the voltage to the completion of charging to a desired value is described with the voltage of the capacitor 9 as a parameter. Based on the capacitor voltage detected in S8, the charge time correction unit 33 raises the duty ratio of the FET 24 with reference to the recharge time adjustment map 37, and increases the current amount of the precharge line 8 from the initial setting. As a result, even when the key switch 11 is left in the ACC position for a long time and then operated in the IG position, the precharge waiting time is shortened, the engine starts quickly, and the time lag until the engine start starts can be reduced. it can.

It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist thereof.
For example, in the above-described embodiment, the current amount of the precharge line 8 is adjusted by PWM control of the FET 24 to change the precharge time, but the current amount of the precharge line 8 is changed by controlling the source follower of the FET 24. May be adjusted. Further, since the motor control device 10 adjusts the amount of current by the FET 24, it is possible to omit the limiting resistor 23 in the precharge line 8. Further, as the control map 30, a map describing the relationship between the temperature and the capacitor capacity may be separately provided to detect the ambient temperature and respond to the capacity change due to the temperature change.

In addition, the capacitor 9 may be provided outside the ISG driver 3, and the deteriorated capacitor 9 may be replaceable regardless of whether the capacitor 9 is inside or outside the ISG driver 3. In that case, in the motor control device / control method of the present invention, the engine can be started with the same precharge time even if the capacity of the capacitor 9 changes, and it is possible to flexibly respond to changes in the capacitor capacity before and after replacement. is there.

The motor control device / control method according to the present invention can be widely applied not only to motors for ISG, but also to in-vehicle motors such as motors for driving radiator fans, motors for other industrial equipment, motors for home appliances, and the like. Is.

1 motor 2 ECU
3 ISG driver 4 Battery 5 Contactor 6 Main power line (main power circuit)
7 Relay 8 Precharge line (precharge circuit)
9 Capacitor 10 Motor controller 11 Key switch 12 Key switch input circuit 13 Relay drive circuit 14 Contactor drive circuit 15 CAN communication circuit 21 Key switch input circuit 22 CAN communication circuit 23 Limiting resistance 24 FET (switching element)
25 Capacitor voltage detection circuit 26 FET control circuit (switching element control circuit)
27 Charging time control unit 28 Memory 29 Timer 30 Control map 31 Capacity change determination unit 32 Threshold arrival time comparison unit 33 Charging time correction unit 34 Capacity change correction map 35 Charging time adjustment unit 36 Precharge time adjustment map 37 Recharge time adjustment map 51 motor 52 ECU
53 ISG driver 54 Battery 55 Contactor 56 Main power line 57 Precharge line 58 Capacitor 59 Key switch 61 Relay 62 Limit resistance Ts Threshold arrival time T0 Threshold arrival time Initial value Tc Normal set time Tk Elapsed time Vs Capacity judgment threshold Vc When fully charged Voltage

Claims (16)

The main power supply circuit that supplies power to the electric motor,
A capacitor connected to the main power supply circuit and provided in front of the electric motor,
A motor control device provided separately from the main power supply circuit and having a precharge circuit for charging the capacitor.
The control device is
The switching element provided in the precharge circuit and
A capacitor voltage detection circuit that detects the charging voltage of the capacitor and
A switching element control circuit that controls the operation of the switching element,
A motor control device including a charging time control unit that controls the switching element control circuit based on the voltage of the capacitor detected by the capacitor voltage detecting unit and controls the charging time of the capacitor. .. In the motor control device according to claim 1,
The main power supply circuit has a first switch unit that opens and closes the circuit.
The precharge circuit has a second switch unit that opens and closes the circuit.
The charging time control unit
When the second switch is turned on, a normal charging mode for charging the capacitor in a predetermined normal set time is performed, while when the first switch unit is turned on within the normal set time, the switching element is used. A motor control device comprising a charging time adjusting unit that controls a device to increase the current of the precharging circuit and implements a charging shortening mode for completing charging of the capacitor earlier than the normal set time. In the motor control device according to claim 2,
When the first switch unit is turned on within the normal set time, the charging time adjusting unit is a control map showing the relationship between the elapsed time since the second switch is turned on and the control mode of the switching element. A motor control device, characterized in that the switching element is controlled by the switching element control circuit based on the above. In the motor control device according to claim 2 or 3.
The charging time adjusting unit is a motor control device that increases the current of the precharging circuit within a range of 95% or less of the allowable current of the switching element after the first switching unit is turned on. In the motor control device according to claim 2,
The motor control device is characterized in that the charging time adjusting unit executes the charging shortening mode based on the voltage of the capacitor when the first switch unit is turned on beyond the normal set time. In the motor control device according to claim 5,
The charging time adjusting unit is based on a control map showing the relationship between the voltage of the capacitor and the control mode of the switching element when the first switch unit is turned on beyond the normal set time. A motor control device characterized in that the switching element is controlled by a control circuit. In the motor control device according to any one of claims 2 to 6.
The electric motor is a motor for starting an automobile engine.
The first switch section is turned on when the key switch of the automobile is in the ignition position.
The second switch unit is a motor control device, which is turned on when the key switch of the automobile is in the accessory position. In the motor control device according to any one of claims 1 to 7.
The charging time control unit
A capacitance change determination unit that detects a capacitance change in the capacitor,
A motor control characterized by having a charging time correction unit that controls the switching element based on a change in the capacitance of the capacitor and completes charging of the capacitor in a predetermined normal set time regardless of the capacitance of the capacitor. apparatus. In the motor control device according to claim 8,
The charging time correction unit is a motor control device characterized in that the switching element is controlled by the switching element control circuit based on a control map showing the relationship between the capacity of the capacitor and the control form of the switching element. In the motor control device according to any one of claims 1 to 9.
The switching element is a FET.
The FET is a motor control device characterized in that it is PWM duty controlled by a switching element control circuit. In the motor control device according to any one of claims 1 to 9.
The switching element is a FET.
The FET is a motor control device characterized in that the source follower is controlled by a switching element control circuit. The main power supply circuit that supplies power to the electric motor,
A capacitor connected to the main power supply circuit and provided in front of the electric motor,
A method for controlling a motor, which is provided separately from the main power supply circuit and has a precharge circuit for charging the capacitor.
A switching element is provided in the precharge circuit.
The charging voltage of the capacitor is detected and
A motor control method characterized in that the charging time of the capacitor is controlled by controlling the switching element based on the voltage of the capacitor. In the motor control method according to claim 12,
The main power supply circuit has a first switch unit that opens and closes the circuit.
The precharge circuit has a second switch unit that opens and closes the circuit.
When the second switch is turned on, a normal charging mode for charging the capacitor in a predetermined normal set time is performed, while when the first switch unit is turned on within the normal set time, the switching element is used. A motor control method, comprising controlling the above to increase the current of the precharge circuit and executing a charge shortening mode for completing charging of the capacitor earlier than the normal set time. In the motor control method according to claim 13,
A motor control method, characterized in that, when the first switch unit is turned on beyond the normal set time, the charge shortening mode is executed based on the voltage of the capacitor. In the motor control method according to claim 13 or 14.
The electric motor is a motor for starting an automobile engine.
The first switch section is turned on when the key switch of the automobile is in the ignition position.
The second switch unit is a motor control method characterized in that the key switch of the automobile is turned on when the key switch is in the accessory position. In the motor control method according to any one of claims 12 to 15,
Detecting the capacitance change of the capacitor,
A motor control method characterized in that the switching element is controlled based on a change in the capacitance of the capacitor, and charging of the capacitor is completed within a predetermined normal set time regardless of the capacitance of the capacitor.

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