JP5631465B1 - Electric supercharger control device and electric supercharger control method - Google Patents

Abstract

An object of the present invention is to provide a control device and a control method for an electric supercharger that maintains acceleration responsiveness regardless of secular change or short-term temperature increase of the electric supercharger. A control device for an electric supercharger that drives a compressor by an electric motor to supercharge an internal combustion engine, wherein the rated rotational speed of the electric motor is set with respect to electric power or current supplied from the DC power source to the electric motor. An electric motor rated rotational speed deriving unit (61, 62) to be determined, a deterioration amount calculating unit (64) for calculating the deterioration amount of the electric supercharger according to the difference between the rated rotational speed and the actual rotational speed, and depending on the deterioration amount And a control correction amount calculation unit (65) for calculating the control correction amount of the electric motor. [Selection] Figure 2

Description

  The present invention relates to a control device for an electric supercharger driven by an electric motor provided on an intake passage in an internal combustion engine, and a control method for the electric supercharger.

  Turbochargers and superchargers are known as means for supercharging an internal combustion engine to increase output. In the turbocharger, a compressor is driven by a turbine that is driven by exhaust gas of an internal combustion engine, and supercharging is performed using air compressed by the compressor. The supercharger connects the internal combustion engine and the compressor with a belt, a gear, or the like, and drives the compressor by the rotation to perform supercharging.

  In recent years, an electric motor is attached to the rotating shaft of a turbocharger, and an electric turbocharger that assists the power of the turbocharger and a supercharger that is driven by the electric motor are provided on the intake passage to supercharge intake air without depending on the internal combustion engine. Electric compressors have been developed as a technology to do this. By providing the electric turbocharger such as the electric turbocharger and the electric compressor, the output of the internal combustion engine is increased, and the acceleration response in accordance with the driver's request is obtained.

  Unlike motors such as ventilation fans and electric fans that continue to drive once they start rotating, electric superchargers have a high frequency of motor drive and stop, ranging from 0 to about 200,000 rpm. Repeat acceleration / deceleration. Therefore, the electric supercharger deteriorates by repeating such driving, acceleration response becomes worse, driving itself becomes difficult, and further, failure such as disconnection and short circuit, seizure and breakage occurs. There is a possibility. For this reason, the technique for detecting the abnormality by deterioration of an electric supercharger and the technique for preventing deterioration of an electric supercharger are known (for example, refer patent documents 1 and 2).

  Here, in the prior art described in Patent Document 1, the rated rotational speed and the actual rotational speed, which are normal rotational speeds that should be output, derived from the air flow rate of the internal combustion engine, the electric power or current supplied to the electric motor, Is equal to or greater than the threshold, it is detected that the electric supercharger has deteriorated and is difficult to drive, and it is determined that there is an abnormality.

  Moreover, in the prior art described in Patent Document 2, the control amount of the electric supercharger is limited according to the temperature of the electric motor. That is, since the temperature rise of the electric motor accelerates the deterioration of the electric motor, the electric supercharger is prevented from deteriorating by limiting the control amount according to the temperature. Further, only at the time of start-up, the control amount is not limited according to the temperature so that the acceleration response is not impaired.

JP 2013-72301 A JP-A-7-19063

However, the prior art has the following problems.
In the first place, the purpose of mounting the electric supercharger is to increase the output of the internal combustion engine and to obtain acceleration response in accordance with the driver's request. Further, in the conventional technology, even if the electric supercharger is somewhat deteriorated due to secular change, the difference between the set target rotational speed (target value) and the actual rotational speed (control value) is reduced by performing speed feedback control. In this way, electric power is supplied from a DC power source to the motor. In such a case, the steady characteristic of the electric supercharger is maintained, but the transient characteristic deteriorates. Therefore, as the electric supercharger deteriorates, it becomes difficult to start gradually, and the acceleration response according to the driver's request is impaired.

  In addition, the transient characteristics are deteriorated not only by the secular change but also by a short-term temperature rise, and the acceleration response according to the driver's request is temporarily impaired. This is because the electric motor generates heat by repeating high-speed / high-current driving, and the resistance of the rotor constituting the electric motor temporarily increases as the temperature rises.

  Here, in the prior art described in Patent Document 1, no reference is made to a means for compensating for deterioration in acceleration response of the electric supercharger due to secular change or short-term temperature rise.

  Moreover, in the prior art described in Patent Document 2, while preventing the deterioration of the electric supercharger by the above-described control and preventing the acceleration response from being impaired, the acceleration response deterioration is actively compensated. It does not take into account the deterioration of acceleration response due to secular change.

  The present invention has been made in order to solve the above-described problems. The electric overcharge that maintains the acceleration response of the electric supercharger regardless of the secular change or short-term temperature rise of the electric supercharger. It is an object of the present invention to provide a control device for a charger and a control method for an electric supercharger.

  In the control device for the electric supercharger according to the present invention, the electric power is supplied from the DC power source according to the motor control amount calculated so that the actual rotational speed corresponding to the control value and the target rotational speed corresponding to the target value coincide. An electric supercharger control device for controlling an electric supercharger comprising: an electric motor that is driven by being supplied; and a compressor that is driven by the electric motor to supercharge the internal combustion engine. Based on the air flow rate of the internal combustion engine, the normal boost pressure to be output for the power or current supplied to the motor is determined as the rated boost pressure, and the power or current is determined based on the rated boost pressure. If the actual rotational speed is equal to or higher than a predetermined first rotational speed threshold, the rated rotational speed is determined. When the actual rotation speed is less than the first rotation speed threshold, the deterioration amount corresponding to the index indicating the degree of deterioration of the motor is calculated and output based on the first difference corresponding to the difference between the actual rotation speed and the actual rotation speed. Deterioration amount in the case of a deterioration amount calculation unit that outputs the deterioration amount output at the previous output without calculating the deterioration amount, and in a low rotation range where the actual rotation speed is less than a predetermined second rotation speed threshold value When the control correction amount for compensating for the transient response of the acceleration response that deteriorates according to the magnitude of the deterioration amount output by the calculation unit is calculated and output, and the actual rotation speed is equal to or greater than the second rotation speed threshold value A control correction amount calculation unit that outputs the control correction amount as zero, and a control correction amount calculation unit for a control amount that is calculated according to a second difference corresponding to a difference between the target rotation speed and the actual rotation speed. Calculate the motor control amount by adding the output control correction amount. A motor control amount computing unit to and outputs, but with a.

  Further, the control method of the electric supercharger according to the present invention is such that the actual rotational speed corresponding to the control value and the target rotational speed corresponding to the target value are calculated from the DC power source according to the motor control amount that is calculated. An electric supercharger control method for controlling an electric supercharger, comprising: an electric motor that is driven by being supplied with electric power; and a compressor that is driven by the electric motor to supercharge the internal combustion engine. Based on the air flow rate of the internal combustion engine, the normal supercharging pressure that should be output for the electric power or current supplied to the electric motor is determined as the rated supercharging pressure. Or a motor rated rotation speed deriving step that determines a normal rotation speed to be output with respect to the current as a rated rotation speed, and the actual rotation speed is equal to or greater than a predetermined first rotation speed threshold value. When the amount of deterioration corresponding to an index indicating the degree of deterioration of the motor is calculated based on the first difference corresponding to the difference between the rated rotation speed and the actual rotation speed, and the actual rotation speed is less than the first rotation speed threshold In the case of a deterioration amount calculation step for outputting the deterioration amount output at the previous output without calculating the deterioration amount, and in a low rotation range where the actual rotation speed is less than a predetermined second rotation speed threshold value. The control correction amount for compensating for the transient response of the acceleration response that deteriorates in accordance with the magnitude of the deterioration amount output in the deterioration amount calculation step is calculated and output, and the actual rotation speed is equal to or greater than the second rotation speed threshold value. In this case, the control correction amount is calculated with respect to the control correction amount calculation step for outputting the control correction amount as zero and the control amount calculated according to the second difference corresponding to the difference between the target rotational speed and the actual rotational speed. Output in the calculation step Those comprising a motor control quantity calculation step for calculating and outputting a motor control amount, the by adding the the control correction amount.

  According to the present invention, the motor control amount is determined according to the deterioration amount calculated based on the difference between the rated rotation speed and the actual rotation speed, with the rated rotation speed of the motor determined for the power or current supplied from the DC power supply. The drive of the electric motor (electric supercharger) is controlled accordingly. Thus, it is possible to provide an electric supercharger control device and an electric supercharger control method that maintain the acceleration response of the electric supercharger regardless of the secular change or short-term temperature rise of the electric supercharger. Can do.

It is a schematic block diagram of the control system of the internal combustion engine of the part relevant to the control apparatus of the electric supercharger by one Embodiment of this invention. It is a control block diagram of the control apparatus of the electric supercharger by this invention. It is the figure which showed the relationship between the air flow rate and supercharging pressure ratio in the same work amount of a compressor. It is the figure which showed the relationship between the air flow rate and supercharging pressure ratio for every same rotational speed of an electric motor. It is a figure which shows an example of the rated supercharging pressure (ratio) map which shows the relationship between the rated supercharging pressure (ratio) by this invention, the air flow rate, and the electric power supplied from DC power supply. It is a figure which shows an example of the rated rotational speed map which shows the relationship between the rated supercharging pressure (ratio) by this invention, an air flow rate, and a rated rotational speed. It is an operation | movement flowchart of the electric motor control apparatus by this invention. It is an operation | movement flowchart of the electric motor control apparatus by this invention.

  In the electric supercharger control device and electric supercharger control method according to the present invention, the rated rotational speed of the electric motor is determined based on the rated supercharging pressure and electric power or current, and the difference between the rated rotational speed and the actual rotational speed is determined. The acceleration response of the electric supercharger is maintained regardless of changes over time or short-term temperature rise by calculating the amount of deterioration of the electric supercharger and correcting the motor control amount in the low rotation range of the motor . DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electric supercharger control device and an electric supercharger control method according to the present invention will be described with reference to the drawings in accordance with preferred embodiments. In the description of the drawings, the same reference numerals are assigned to the same elements, and duplicate descriptions are omitted.

Embodiment 1 FIG.
FIG. 1 is a schematic configuration diagram of a part of an internal combustion engine control system related to an electric supercharger control device according to an embodiment of the present invention.

  The internal combustion engine (engine) 1 described in this embodiment is a four-cylinder engine, which drives a compressor 9 by an electric motor 12 to be described later and supercharges a larger amount of intake air to increase the output. It can also achieve low fuel consumption.

  The applied engine 1 is not limited in the number of cylinders. The engine combustion method is not limited, and can be applied to a direct engine that injects fuel into a cylinder and a port injection engine that injects fuel into the intake manifold 2 after the throttle valve 7.

  The air taken in from the atmosphere is first removed from the atmosphere by the air cleaner 41 in the intake pipe 42. Next, the air is compressed through a compressor 9 driven by the motor 12 (the motor 12 and the compressor 9 constitute an electric supercharger).

  Here, since the temperature of the compressed air is increased due to an increase in pressure, cooling is performed by the intercooler 8 for the purpose of improving the charging efficiency. In the case of this air or port injection engine, the air-fuel mixture is sucked into the engine in accordance with the throttle position of the throttle valve 7 driven by the actuator 6.

  By igniting the air-fuel mixture after inhaling into the engine 1, a cylinder (not shown) in the engine is pushed down, and the crank (not shown) converts the vertical motion of the cylinder into a rotational motion, which is used as the driving force for the vehicle. Used.

  Exhaust gas after combustion in the engine 1 is purified by a muffler 45 integrated with an exhaust gas purification catalyst (not shown) through an exhaust manifold 19 and discharged into the atmosphere.

  The control device 13 for the electric supercharger receives the control signal from the engine control device 14 and controls the electric motor 12 via the electric motor power conversion device 50. The electric motor 12 includes a motor position sensor 46. A battery 49 that is a DC power supply supplies DC power to the electric motor power conversion device 50 and includes a battery current sensor 47 and a battery voltage sensor 48. The control device 13 for the electric supercharger includes a warning lamp 52 as a display unit. The engine control device 14 is provided in the throttle position sensor 20 of the actuator 6 of the throttle valve 7, the accelerator opening sensor (accelerator opening detector) (not shown) of the accelerator pedal 15, and the output side passage 43 of the electric supercharger. The air flow rate detection (sensor) unit 5, the engine rotation speed detection (sensor) unit 21 and the like receive signals.

  FIG. 2 is a control block diagram of the control device for the electric supercharger according to the present invention. The control device 13 for the electric supercharger is an arithmetic logic operation capable circuit (microcomputer or the like) including a CPU, a RAM, a ROM, and the like. The drive enable / disable determining unit 39 determines drive enable / disable based on the drive command signal of the electric motor 12 output from the engine control device (hereinafter referred to as engine ECU) 14, and indicates whether the electric motor 12 is driven or stopped. Output a signal.

  The target rotational speed calculation unit 31 determines and outputs a target rotational speed value based on the throttle position, air flow rate, and rotational speed of the internal combustion engine output from the engine ECU 14. The actual rotation speed detector 32 detects and outputs an actual rotation speed value based on the motor position signal from the motor position sensor 46. The motor control amount calculation unit 60 is configured to control the motor control amount based on the difference between the target rotational speed value obtained by the first subtractor 37 and the actual rotational speed value and the control correction amount output by the motor control correction amount deriving unit 38. Is output.

  The motor power conversion device 50 converts the DC power from the battery 49 into AC power corresponding to the motor control amount only when a drive command signal (drive enable / disable signal indicating drive) is output from the drive enable / disable determining unit 39. It converts and supplies to the electric motor 12, and the compressor 9 is driven.

  The battery current detection unit 33 detects the battery current from the battery current sensor 47, and the battery voltage detection unit 34 detects the battery voltage from the battery voltage sensor 48. Based on the battery current and the battery voltage, the battery power detection unit 35 obtains and outputs the battery power.

  Next, the motor control correction amount deriving unit 38 will be described in detail. Here, as described above, the purpose of mounting the electric supercharger is to increase the output of the internal combustion engine and to obtain acceleration response in accordance with the driver's request. On the other hand, since the electric motor 12 repeats acceleration / deceleration over a wide range of 0 to about 200,000 rpm, the electric motor 12 is deteriorated, gradually starting difficult, and the acceleration responsiveness according to the driver's request is impaired. Go. Further, not only the secular change but also the transient characteristics are deteriorated by a short-term temperature rise, so that the acceleration response according to the driver's request is temporarily impaired. This is because the electric motor 12 generates heat by repeating high-speed / high-current driving, and the resistance of the rotor constituting the electric motor 12 temporarily increases as the temperature rises.

  Furthermore, even if the electric supercharger is somewhat deteriorated, if speed feedback control is performed, power is supplied from the battery 49 to the motor 12 so that the target rotational speed is determined and the difference between the target rotational speed and the actual rotational speed is reduced. Therefore, the steady characteristic is maintained, but the transient characteristic is inevitably deteriorated. However, unlike motors such as ventilation fans and fans that continue to drive once they start rotating, the acceleration response is extremely important for electric superchargers because the motor is driven and stopped frequently. Therefore, the deterioration of the electric motor 12 cannot be ignored.

  Therefore, the deterioration amount of the electric supercharger is calculated in order to maintain the acceleration responsiveness in accordance with the driver's request regardless of the secular change or the temperature rise of the motor 12, and the motor control amount is increased as the deterioration amount increases. An electric motor control correction amount deriving unit 38 that outputs a large control correction amount is provided as a correction amount for correction.

  Here, the deterioration amount of the electric supercharger is determined based on the difference between the rated rotational speed and the actual rotational speed of the electric motor 12 by determining the rated rotational speed for the current or electric power supplied from the battery 49 to the electric motor 12. Next, this calculation method will be described in detail.

  In this calculation method, paying attention to the fact that the current and electric power supplied from the battery 49 to the electric supercharger differ according to the deterioration amount of the electric supercharger, the deterioration amount is calculated based on the supplied current or electric power. calculate. Specifically, with respect to the current or power supplied from the battery 49 to the electric supercharger, the rated rotational speed that is the rotational speed that should be output during normal operation of the electric motor 12 and the actual rotational speed of the electric motor 12 The difference corresponds to the deterioration amount.

  Thus, the amount of deterioration is defined as an index indicating the degree of deterioration of the electric supercharger. Note that the deterioration amount may be determined in association with the difference between the rated rotation speed and the actual rotation speed. Specifically, a table associating the difference with the deterioration amount may be determined in advance, and the deterioration amount corresponding to the difference calculated by an electric motor control correction amount deriving unit 38 to be described later may be selected. Alternatively, the deterioration amount may be obtained by multiplying the difference calculated by the motor control correction amount deriving unit 38 by a predetermined gain.

  In the present invention, since there is a system constituted by an electric supercharger, the supercharging pressure is taken into consideration. Therefore, after determining the rated boost pressure for the current or power based on the air amount of the internal combustion engine and the current or power supplied from the battery 49 to the motor 12, the current is further calculated from the air flow rate and the rated boost pressure of the internal combustion engine. Or the rated rotational speed for electric power is determined.

  A method for calculating the rated boost pressure will be described in detail. First, as shown in the equation (1), the value obtained by subtracting the loss of the electric motor 12, the mechanical loss (mechanical loss), etc., from the electric power supplied from the battery 49 is the work of the compressor 9.

  Compressor work = supply power-(motor loss + inverter loss + mechanical loss) (1)

  Further, as shown in the equation (2), the work of the compressor 9 is obtained by the product of the supercharging pressure and the air flow rate, that is, output during normal operation of the motor 12 with respect to the power supplied from the battery 49 and the air flow rate. The boost pressure to be performed is uniquely determined.

  Compressor work = supercharging pressure * air flow rate (2)

FIG. 3 is a graph showing the relationship between the air flow rate and the supercharging pressure ratio for each identical work amount of the compressor 9 with the horizontal axis representing the air flow rate and the vertical axis representing the supercharging pressure ratio. FIG. 4 is a diagram showing the relationship between the air flow rate and the supercharging pressure ratio at the same rotational speed of the electric motor 12 with the horizontal axis representing the air flow rate and the vertical axis representing the supercharging pressure ratio. The unit of the air flow rate means [m ³ / s].

  As described above, the supercharging pressure ratio that should be output during normal operation of the electric motor 12 is obtained based on the power supplied from the battery 49 and the air flow rate, and should be output during normal operation of the electric motor 12 based on the supercharging pressure ratio and the air flow rate. The rated speed is uniquely determined.

  The motor control correction amount deriving unit 38 includes a rated boost pressure calculating unit 61 for electric power, a rated rotational speed calculating unit 62 for electric power, a second differentiator 63, a deterioration amount calculating unit 64, and a control correction amount calculating unit 65. Is done. Further, the rated boost pressure calculation unit 61 for electric power and the rated rotation speed calculation unit 62 for electric power constitute an electric motor rated rotation speed deriving unit.

  The rated supercharging pressure calculation unit 61 for power is provided with a map of the rated supercharging pressure (ratio) corresponding to the battery power and the air flow rate in the ROM, and the output of the battery power detection unit 35 (from the DC power source) Supply power) and a value read according to the air flow rate output from the engine ECU 14 is output as a rated boost pressure (ratio). An example of the rated boost pressure (ratio) map is shown in FIG. The vertical axis represents the rated boost pressure (ratio), the horizontal axis represents the air flow rate, and the depth direction represents the power supplied from the DC power supply (battery) (however, FIG. 5 is a perspective view).

  The rated rotational speed calculation unit 62 for electric power includes a map in the ROM of the value of the rated rotational speed corresponding to the supercharging pressure (ratio) and the air flow rate, and the output of the rated supercharging pressure calculation unit 61 for electric power. And the value read according to the air flow rate output from engine ECU14 is output as a rated rotational speed. An example of the rated rotation speed map is shown in FIG. The vertical axis represents the rated boost pressure (ratio), the horizontal axis represents the air flow rate, and the depth direction represents the rated rotational speed (however, FIG. 6 is a perspective view).

  The second subtractor 63 outputs the difference between the output of the rated rotation speed calculation unit 62 and the actual rotation speed value of the actual rotation speed detection unit 32 with respect to electric power. The deterioration amount calculator 64 calculates and outputs the deterioration amount of the electric supercharger based on the output of the second subtractor 63. However, the deterioration amount calculation unit 64 calculates the deterioration amount when the output of the actual rotation speed detection unit 32 is equal to or greater than a predetermined first rotation speed threshold. This is because there is no difference in a state where the motor 12 stops driving.

  The control correction amount calculation unit 65 calculates a control correction amount based on the output of the deterioration amount calculation unit 64. However, the control correction amount calculation unit 65 sets the output of the control correction amount to zero when the output of the actual rotation speed detection unit 32 is equal to or greater than a predetermined second rotation speed threshold. The purpose of this control is to maintain acceleration responsiveness when the motor 12 is started, and the control amount needs to be corrected only immediately after the start of acceleration. That is, by setting the second rotation speed threshold value in advance, the electric motor 12 (electric supercharger) can be controlled so as to maintain responsiveness in a desired low rotation range.

  In addition, the control correction amount calculation unit 65 changes the control correction amount according to the deterioration amount so that the response performance of the electric motor 12 in the low rotation speed region in the initial state (when there is no deterioration) can be maintained. Here, as an index indicating the response performance, a responsiveness parameter amount (for example, rise time, delay time, settling time, overshoot time, etc.) is used. Based on this responsiveness parameter amount, the control correction amount is determined in advance according to the deterioration amount so that the response performance after deterioration and the response performance in the initial state coincide with each other in the low rotation range (starting). That's fine.

  Specifically, a table in which the deterioration amount and the control correction amount are associated with each other may be determined in advance, and the control correction amount calculation unit 65 may select a control correction amount corresponding to the deterioration amount. Further, the control correction amount may be obtained by multiplying the deterioration amount by a predetermined gain. In this way, by configuring so as to select an appropriate control correction amount according to the deterioration amount, it is possible to compensate for the transient response of the acceleration response that deteriorates according to the magnitude of the deterioration amount.

  The motor control amount calculation unit 60 adds the control correction amount output by the control correction amount calculation unit 65 according to the deterioration amount to the control amount calculated based on the difference between the target rotation speed value and the actual rotation speed value. By doing so, it is output as an electric motor control amount.

  The engine ECU 14 obtains the throttle position (throttle opening) from the throttle position sensor 20 provided in the actuator 6 of the throttle valve 7 shown in FIG. Here, instead of the throttle position, the accelerator opening of the accelerator opening sensor of the accelerator pedal 15 may be used. The throttle valve 7 is a so-called electronically controlled throttle valve, and when the driver depresses the accelerator pedal, the operation amount of the accelerator pedal is detected by a sensor, and the actuator 6 operates in response to this to drive and change the throttle position. The throttle position can be regarded as almost synonymous with the accelerator opening. However, in a transition period such as acceleration, some time is required until the throttle position becomes equal to the accelerator opening. If the control is performed using the accelerator opening, the responsiveness to the driver's acceleration request is improved.

  7A and 7B are flowcharts showing the operation of the control device 13 for the electric supercharger, and the specific operation will be described below. 7A and 7B include steps S101 to S117 from the start to the end, and the control device 13 for the electric supercharger repeatedly performs a series of processes. 7A and 7B show one flowchart divided into two drawings, and the part shown in FIG. 7A and the part shown in FIG. 7B are continued.

  First, in step S101, the output of the engine ECU 14 is written and stored in a microcomputer memory (not shown) as an air flow rate value, an engine rotation speed value, a drive command value, and a throttle position value.

  In step S102, the previous value of the deterioration amount stored in the memory is obtained.

  In step S103, the actual rotation speed detection unit 32 calculates an actual rotation speed value according to the signal from the motor position sensor 46, and writes and stores it in the memory.

  In step S104, the battery current detection unit 33 and the battery voltage detection unit 34 write and store the battery current value from the output of the battery current sensor 47 and the battery voltage value from the output of the battery voltage sensor 48 in the memory.

  In step S105, the target rotational speed calculation unit 31 calculates the target rotational speed value from the air flow rate value, engine rotational speed value, and throttle position value stored in the memory, and writes and stores them in the memory.

  In step S106, the battery power detection unit 35 calculates the battery power from the battery current value and the battery voltage value stored in the memory, and writes and stores them in the memory.

  In step S107, the rated supercharging pressure calculation unit 61 for power refers to the rated supercharging pressure map shown in FIG. 5 stored in advance in the memory, and the rated supercharging corresponding to the battery power and the air flow rate stored in the memory. The pressure (ratio) is read and stored in the memory.

  In step S108, the rated rotational speed calculation unit 62 for electric power refers to the rated rotational speed map shown in FIG. 6 stored in the memory in advance, and the rated rotational speed corresponding to the rated supercharging pressure and the air flow rate stored in the memory. Is written and stored in the memory.

  In step S109, the second subtractor 63 calculates the difference between the rated rotational speed stored in the memory and the actual rotational speed, and writes and stores it in the memory.

  In step S110, it is determined whether or not the actual rotational speed stored in the memory is equal to or greater than a first rotational speed threshold value stored in advance in the memory. When the determination result is YES (above the first rotation speed threshold value), the process proceeds to step S111. On the other hand, when the determination result is NO (less than the first rotation speed threshold), it is determined that it is unnecessary to calculate the current value of the deterioration amount, and the process proceeds to step S112.

  In step S111, the deterioration amount calculation unit 64 calculates the current value of the deterioration amount based on the difference between the rated rotation speed and the actual rotation speed stored in the memory, and writes and stores it in the memory.

  In step S112, the deterioration amount calculation unit 64 sets the previous value of the deterioration amount stored in the memory as the current value of the deterioration amount, and writes and stores it in the memory.

  In step S113, it is determined whether or not the actual rotation speed stored in the memory is less than a second rotation speed threshold stored in advance in the memory. When the determination result is YES (less than the second rotation speed threshold value), the process proceeds to step S114. On the other hand, when the determination result is NO (second rotation speed threshold or more), it is determined that correction is not necessary, and the process proceeds to step S115.

  In step S114, the control correction amount calculation unit 65 calculates the control correction amount based on the current value of the deterioration amount stored in the memory, and writes and stores it in the memory.

  In step S115, the control correction amount calculation unit 65 sets the control correction amount to zero and writes and stores it in the memory.

  In step S116, the first differencer 37 calculates the difference between the stored target rotational speed and the actual rotational speed, and stores it in the memory.

  In step S117, the motor control amount calculation unit 60 calculates and outputs the motor control amount based on the difference between the target rotation speed value and the actual rotation speed value stored in the memory and the control correction amount stored in the memory. Write and store in memory.

  The electric motor power converter 50 outputs the electric motor control amount (output from the electric motor control amount calculator 60) only when the drive stop command is not output from the drive availability determination unit 39 of the electric supercharger control device 13. The DC power from the battery 49 is converted into AC according to the motor control amount signal) and supplied to the motor (motor) 12.

  As described above, the rated supercharging pressure of the electric motor is determined with respect to the electric power supplied to the electric motor that is a driving device of the electric supercharger from the battery that is a direct current power source, and the electric power supplied to the electric motor based on the rated supercharging pressure is determined. Determine the rated speed of the motor. Then, according to the deterioration amount calculated based on the difference between the rated rotation speed value and the actual rotation speed value, the motor control amount in the low rotation region (speed region where the actual rotation speed is less than the second rotation speed threshold) of the motor is determined. to correct. This makes it possible to maintain the acceleration response of the electric supercharger regardless of changes over time or a short-term temperature increase.

  In the above embodiment, the battery power detection unit 35 obtains and outputs the battery power based on the output of the battery current detection unit 33 and the output of the battery voltage detection unit 34, and the rated boost pressure calculation unit 61 for the power. The rated boost pressure is determined and output based on the output of the battery power detection unit 35 and the air flow rate, and the output of the rated boost pressure calculation unit 61 for the power and the air flow rate of the internal combustion engine in the rated rotation speed calculation unit 62 for the power. Based on the above, the rated rotational speed with respect to the electric power is obtained and output. However, the rated boost pressure for the current may be obtained based on the output of the battery current detection unit 33, and the rated rotational speed for the current may be obtained and output based on the rated boost pressure for the current and the air flow rate. Thus, the rated rotation speed can be calculated with a simpler configuration without calculating the power of the battery 49 in order to compensate for the deterioration in acceleration response of the electric motor 12.

  In this case, the battery voltage sensor 48, the battery voltage detection unit 34, and the battery power detection unit 35 in FIG. 2 are not necessary. Further, a rated supercharging pressure calculation unit for current is provided instead of the rated supercharging pressure calculation unit 61 for electric power, and the rated supercharging pressure (ratio) of FIG. 5 is used instead of the rated supercharging pressure (ratio) map of FIG. ) A map whose depth direction indicates the supply current [I] from the DC power supply (battery) is prepared in advance and stored in the memory.

  In the above embodiment, the rated boost pressure for power is determined in the rated boost pressure calculation unit 61 for power according to the air flow rate and the output of the battery power detection unit 35. It is good also as a structure which adds the smoothing process to the output of the detection part 35, and then inputs into the rated supercharging pressure calculation part 61. FIG. The annealing process may be performed after an elapse of a predetermined time by, for example, an output delay circuit or the like, or may be configured by a primary low-pass filter or the like so that the amount of change in power shifts with time. . Thus, since there is a time lag before the electric motor 12 is actually driven with respect to the power supply from the battery 49, the detection accuracy of the deterioration amount is improved by applying a smoothing process to the battery power. Can be made.

  In this case, when the rated rotation speed is obtained based on the electric power, the output side of the battery power detection unit 35 is obtained, and when the rated rotation speed is obtained based on the electric current, for example, the output side of the battery current detection unit 33, that is, the rated supercharging. An output or input smoothing processing unit having functions of output delay and primary low-pass filter is provided on the input side of the motor rated rotational speed deriving unit composed of the pressure calculating unit 61 and the rated rotational speed calculating unit 62.

  In the above embodiment, the deterioration amount calculation unit 64 calculates the deterioration amount of the electric supercharger when the actual rotation speed is greater than or equal to the first rotation speed threshold. However, the actual rotation speed is the first rotation. The deterioration amount may be calculated only when the difference between the rated rotation speed and the actual rotation speed is less than a predetermined rotation speed difference threshold value (at the time of steady rotation). At this time, if this difference is equal to or greater than the rotation speed difference threshold (when the rotation is transient), the deterioration amount is not calculated. In this way, by calculating the amount of deterioration only at the time of steady rotation using the previous value without calculating the amount of deterioration at the time of rotational transition, the detection accuracy of the amount of deterioration can be improved.

  In the above embodiment, the deterioration amount calculation unit 64 calculates the deterioration amount of the electric supercharger when the actual rotation speed is equal to or higher than the first rotation speed threshold. Based on the output, the battery current change rate is determined, and the deterioration amount is calculated when the actual rotation speed is equal to or higher than the first rotation speed threshold value and the battery current change rate is less than the predetermined current change rate threshold value. Good. As described above, when the system becomes unstable due to a change in the battery current, that is, torque fluctuation, the deterioration amount detection accuracy can be improved by not calculating the deterioration amount.

  In this case, the motor control correction amount deriving unit 38 further includes a battery current change rate calculating unit that obtains a change rate of the battery current based on the output of the battery current detecting unit 33. If the battery current change rate is equal to or greater than the current change rate threshold, the deterioration amount calculation unit 64 outputs the previous value of the deterioration amount stored in the memory as the current value of the deterioration amount without calculating the deterioration amount. Like that.

  In the above embodiment, when the actual rotation speed is less than the first rotation speed threshold value in the deterioration amount calculation unit 64, the previous value of the deterioration amount is used. However, the control correction amount calculation unit 65 uses the previous value of the deterioration amount. There is a possibility that excessive correction may occur by using the control correction amount calculated based on the value. For example, in a case where driving of the motor 12 in a high temperature state is stopped and the driving is performed again after a sufficient time has elapsed, the actual rotation speed immediately after the start of driving is less than the first rotation speed threshold in the deterioration amount calculation unit 64. Therefore, the previous value of the deterioration amount is output. In this case, although the temperature of the electric motor 12 is decreasing, the previous value of the deterioration amount includes a short-term component due to the temperature increase before the drive is stopped. It may be larger than the value.

  Therefore, when the deterioration amount calculation unit 64 calculates the deterioration amount of the electric supercharger according to the difference between the rated rotation speed calculated by the second subtractor 63 and the actual rotation speed, the deterioration amount of the electric motor 12 is calculated. The calculation may be performed separately for a short-term component due to temperature rise and a steady-state component due to secular change. That is, a steady-state component due to secular change is calculated by constantly calculating a short-term component of the deterioration amount of the electric supercharger by detecting the temperature of the electric motor 12. When using the previous value of the deterioration amount, the current value corresponding to the short-term component of the deterioration amount and the previous value corresponding to the steady component of the deterioration amount are output as the current value of the deterioration amount. To do. Thus, by separating the deterioration amount of the electric supercharger into a short-term component and a steady-state component, even if the previous value of the deterioration amount is used after the motor 12 has stopped driving and a sufficient time has passed, control is performed. It is possible to prevent the output of the correction amount calculation unit 65 from becoming excessive.

  In this case, the control device 13 for the electric supercharger includes a temperature detection unit that detects the temperature of the electric motor based on the temperature sensor. In addition, the deterioration amount calculation unit 64 calculates a deterioration amount as a total deterioration amount according to the difference between the rated rotation speed calculated by the second subtractor 63 and the actual rotation speed, and outputs the total deterioration amount. Deterioration due to secular change by subtracting the output of the short-term deterioration amount calculation unit from the output of the total deterioration amount calculation unit and the short-term deterioration amount calculation unit that calculates and outputs the deterioration amount due to temporary temperature rise based on the output of the part A steady deterioration amount calculation unit for calculating a steady component of the amount is included. In addition, when the deterioration amount calculation unit 64 calculates the current value of the deterioration amount according to the difference between the rated rotation speed and the actual rotation speed, the output of the total deterioration amount calculation unit is output as the current value of the deterioration amount. Like that. On the other hand, when the deterioration amount calculation unit 64 uses the previous value of the deterioration amount as the current value of the deterioration amount, the output of the short-term deterioration amount calculation unit and the previous value of the output of the steady deterioration amount calculation unit stored in the memory Is added as a current value of the deterioration amount.

  In the above embodiment, the control correction amount calculation unit 65 calculates the control correction amount calculated based on the output of the deterioration amount calculation unit 64 when the output of the actual rotation speed detection unit 32 is less than the second rotation speed threshold. When the output of the actual rotational speed detection unit 32 is equal to or greater than the second rotational speed threshold, the control correction amount output is set to zero. Further, the motor control amount calculation unit 60 calculates the motor control amount calculated based on the difference between the target rotation speed value calculated by the first subtractor 37 and the actual rotation speed value and the output of the control correction amount calculation unit 65. I decided to output it. However, the control correction amount calculation unit 65 calculates the resistance value control correction amount for correcting (changing) the predetermined rated resistance value of the motor 12 according to the deterioration amount as the control correction amount, and also calculates the motor control amount calculation. The unit 60 may be configured to calculate the motor control amount based on the difference between the target rotation speed value calculated by the first subtractor 37 and the actual rotation speed value and the resistance value control correction amount.

  Here, when the electric motor 12 is controlled based on the specification values such as the resistance of the electric motor 12, the influence of the fluctuation of the electric resistance of the electric motor 12 on the calculation result of the electric motor control amount is large in the low rotation range. That is, the higher the actual rotational speed, the smaller the influence of the resistance value of the motor. Therefore, the control correction amount calculation unit 65 outputs the control correction amount in the entire rotation range regardless of the output of the actual rotation speed detection unit 32, and corrects the resistance value of the electric motor 12. Thus, as in the above embodiment, the motor control amount can be corrected only in the low rotation range without switching between the low rotation range and the middle / high speed rotation range using the output of the actual rotation speed detection unit 32. As compared with the switching by the threshold value described above, smooth control can be performed without a step difference at the time of switching.

  In this case, the control correction amount calculation unit 65 outputs the control correction amount in the entire rotation range based on the output of the deterioration amount calculation unit 64, and is calculated by the first difference unit 37 in the motor control amount calculation unit 60. The motor is controlled (resistance control) based on the difference between the rated rotation speed and the actual rotation speed and the resistance value control correction amount.

  In addition, the deterioration amount calculation unit 64 may include a nonvolatile memory, and the calculated deterioration amount of the electric supercharger may be stored in this memory and used as the previous value of the deterioration amount. As a result, even after the vehicle is turned off, the amount of deterioration can be taken over, and the acceleration response of the electric supercharger can be maintained from the initial drive.

  Further, when the deterioration amount of the electric supercharger is equal to or greater than a predetermined deterioration threshold value, this control may be canceled (the motor control amount is not corrected). As a result, when the deterioration of the electric supercharger has sufficiently progressed, it is possible to prevent the occurrence of failures such as disconnection and short circuit, and seizure and damage.

  In this case, if the output of the deterioration amount calculation unit 64 is equal to or greater than the deterioration threshold, the output of the control correction amount calculation unit 65 may be configured to be zero.

  In addition, the electric supercharger may be a so-called electric turbocharger that includes an exhaust turbine and is supercharged with electric energy and exhaust energy.

  In this invention, the motor control that determines the rated rotational speed of the motor for the electric power or current supplied from the DC power source to the driving device and corrects the motor according to the deterioration amount calculated based on the difference between the rated rotational speed and the actual rotational speed. By controlling the electric motor according to the amount, the control device for the electric supercharger and the control of the electric supercharger can maintain the acceleration responsiveness of the electric supercharger regardless of aging or short-term temperature rise It becomes possible to provide a method.

  DESCRIPTION OF SYMBOLS 1 Internal combustion engine (engine), 2 intake manifold, 5 Air flow detection (sensor) part, 6 Actuator, 7 Throttle valve, 8 Intercooler, 9 Compressor, 12 Electric motor, 13 Control device of electric supercharger, 14 Engine control device (Engine ECU), 15 accelerator pedal, 19 exhaust manifold, 20 throttle position sensor, 21 engine rotation speed detection (sensor) section, 31 target rotation speed calculation section, 32 actual rotation speed detection section, 33 battery current detection section, 34 battery Voltage detection unit, 35 Battery power detection unit, 37 First difference unit, 38 Motor control correction amount derivation unit, 39 Drive availability determination unit, 41 Air cleaner, 42 Intake pipe, 43 Output side passage of electric supercharger, 45 Muffler 46 Motor position sensor, 47 Battery current sensor, 48 battery voltage sensor, 49 battery, 50 motor power converter, 52 warning light, 60 motor control amount calculation unit, 61 rated boost pressure calculation unit for electric power, 62 rated rotation speed calculation unit for electric power, 63 2 differentiators, 64 deterioration amount calculation unit, 65 control correction amount calculation unit.

Claims (9)

An electric motor driven by electric power supplied from a DC power source in accordance with an electric motor control amount calculated so that an actual rotational speed corresponding to the control value and a target rotational speed corresponding to the target value match, and the electric motor A control device for the electric supercharger for controlling the electric supercharger, comprising a compressor for supercharging the internal combustion engine by being driven by
Based on the air flow rate of the internal combustion engine, a normal supercharging pressure to be output with respect to the electric power or current supplied to the electric motor is defined as a rated supercharging pressure, and based on the determined rated supercharging pressure, the electric power Or a motor rated rotational speed deriving unit that determines a normal rotational speed to be output for the current as a rated rotational speed;
When the actual rotation speed is equal to or higher than a predetermined first rotation speed threshold, it corresponds to an index indicating the degree of deterioration of the electric motor based on a first difference corresponding to the difference between the rated rotation speed and the actual rotation speed. Deterioration that outputs the deterioration amount output at the previous output without calculating the deterioration amount when the actual rotation speed is less than the first rotation speed threshold value. A quantity calculation unit;
In the case of a low rotation range where the actual rotation speed is less than a predetermined second rotation speed threshold, the transient characteristic of the acceleration response that deteriorates according to the magnitude of the deterioration amount output by the deterioration amount calculation unit is compensated. A control correction amount calculation unit for calculating and outputting a control correction amount for performing, and outputting the control correction amount as zero when the actual rotation speed is equal to or greater than the second rotation speed threshold;
The electric motor by adding the control correction amount output by the control correction amount calculation unit to a control amount calculated according to a second difference corresponding to a difference between the target rotation speed and the actual rotation speed. An electric motor control amount calculation unit that calculates and outputs a control amount;
An electric supercharger control device comprising: In the control device for the electric supercharger according to claim 1,
The control correction amount calculation unit
Even if the actual rotation speed is less than the second rotation speed threshold, if the deterioration amount output by the deterioration amount calculation unit is greater than or equal to a predetermined deterioration threshold, the control correction amount is output as zero. Feeder control device. An electric motor driven by electric power supplied from a DC power source in accordance with an electric motor control amount calculated so that an actual rotational speed corresponding to the control value and a target rotational speed corresponding to the target value match, and the electric motor A control device for the electric supercharger for controlling the electric supercharger, comprising a compressor for supercharging the internal combustion engine by being driven by
Based on the air flow rate of the internal combustion engine, a normal supercharging pressure to be output with respect to the electric power or current supplied to the electric motor is defined as a rated supercharging pressure, and based on the determined rated supercharging pressure, the electric power Or a motor rated rotational speed deriving unit that determines a normal rotational speed to be output for the current as a rated rotational speed;
When the actual rotation speed is equal to or higher than a predetermined first rotation speed threshold, it corresponds to an index indicating the degree of deterioration of the electric motor based on a first difference corresponding to the difference between the rated rotation speed and the actual rotation speed. Deterioration that outputs the deterioration amount output at the previous output without calculating the deterioration amount when the actual rotation speed is less than the first rotation speed threshold value. A quantity calculation unit;
In order to compensate for the transient response of the acceleration response that deteriorates according to the magnitude of the deterioration amount output by the deterioration amount calculation unit, the deterioration amount calculation unit outputs a rated resistance value that is predetermined for the resistance of the motor. A control correction amount calculation unit that calculates and outputs a resistance value control correction amount for changing based on the deterioration amount;
In accordance with the resistance value of the motor changed based on the resistance value control correction amount output by the control correction amount calculation unit, and a second difference corresponding to the difference between the target rotation speed and the actual rotation speed An electric motor control amount calculation unit that calculates and outputs an electric motor control amount; and
An electric supercharger control device comprising: In the control device for the electric supercharger according to claim 3,
The control correction amount calculation unit
A control device for an electric supercharger that outputs the control correction amount as zero when the deterioration amount output by the deterioration amount calculation unit is equal to or greater than a predetermined deterioration threshold. In the control device for the electric supercharger according to any one of claims 1 to 4,
The deterioration amount calculation unit
Even when the actual rotation speed is equal to or higher than the first rotation speed threshold when the deterioration amount is output this time, if the first difference is equal to or higher than a predetermined rotation speed difference threshold, the deterioration amount A control device for an electric supercharger that outputs the deterioration amount output at the previous output without performing a calculation. In the control device for the electric supercharger according to any one of claims 1 to 5,
A current change rate calculating unit for detecting a current change rate when the DC power supply supplies power to the electric motor;
The deterioration amount calculation unit
Even when the actual rotation speed is equal to or higher than the first rotation speed threshold at the time of the current output of the deterioration amount, if the current change rate is equal to or higher than a predetermined current change rate threshold, the deterioration amount A control device for an electric supercharger that outputs the deterioration amount output at the previous output without performing a calculation. In the control device for the electric supercharger according to any one of claims 1 to 6,
A temperature detection unit for detecting the temperature of the electric motor;
The deterioration amount calculation unit
The deterioration amount is calculated based on the first difference, the deterioration amount of a short-term component is calculated based on the temperature detected by the temperature detection unit, and based on the temperature from the deterioration amount calculated based on the first difference. Calculate the deterioration amount of the steady component by subtracting the calculated deterioration amount of the short-term component,
When the deterioration amount output at the previous output is output at the time of the current output of the deterioration amount, instead of the deterioration amount output at the previous output, the deterioration amount of the steady component calculated at the previous time And a control device for the electric supercharger that outputs a value obtained by adding the amount of deterioration of the short-term component calculated this time. An electric motor driven by electric power supplied from a DC power source in accordance with an electric motor control amount calculated so that an actual rotational speed corresponding to the control value and a target rotational speed corresponding to the target value match, and the electric motor A method of controlling the electric supercharger for controlling the electric supercharger, comprising a compressor for supercharging the internal combustion engine by being driven by
Based on the air flow rate of the internal combustion engine, a normal supercharging pressure to be output with respect to the electric power or current supplied to the electric motor is defined as a rated supercharging pressure, and based on the determined rated supercharging pressure, the electric power Or a motor rated rotational speed derivation step for determining a normal rotational speed to be output for the current as a rated rotational speed;
When the actual rotation speed is equal to or higher than a predetermined first rotation speed threshold, it corresponds to an index indicating the degree of deterioration of the electric motor based on a first difference corresponding to the difference between the rated rotation speed and the actual rotation speed. Deterioration that outputs the deterioration amount output at the previous output without calculating the deterioration amount when the actual rotation speed is less than the first rotation speed threshold value. A quantity calculation step;
In the case of a low rotation range where the actual rotation speed is less than a predetermined second rotation speed threshold, the transient characteristic of the acceleration response that deteriorates in accordance with the magnitude of the deterioration amount output in the deterioration amount calculation step is compensated. A control correction amount calculating step for calculating and outputting a control correction amount for performing, and outputting the control correction amount as zero when the actual rotation speed is equal to or greater than the second rotation speed threshold;
By adding the control correction amount output in the control correction amount calculation step to the control amount calculated according to a second difference corresponding to the difference between the target rotation speed and the actual rotation speed, the electric motor A motor control amount calculation step for calculating and outputting a control amount;
An electric supercharger control method comprising: An electric motor driven by electric power supplied from a DC power source in accordance with an electric motor control amount calculated so that an actual rotational speed corresponding to the control value and a target rotational speed corresponding to the target value match, and the electric motor A method of controlling the electric supercharger for controlling the electric supercharger, comprising a compressor for supercharging the internal combustion engine by being driven by
Based on the air flow rate of the internal combustion engine, a normal supercharging pressure to be output with respect to the electric power or current supplied to the electric motor is defined as a rated supercharging pressure, and based on the determined rated supercharging pressure, the electric power Or a motor rated rotational speed derivation step for determining a normal rotational speed to be output for the current as a rated rotational speed;
When the actual rotation speed is equal to or higher than a predetermined first rotation speed threshold, it corresponds to an index indicating the degree of deterioration of the electric motor based on a first difference corresponding to the difference between the rated rotation speed and the actual rotation speed. Deterioration that outputs the deterioration amount output at the previous output without calculating the deterioration amount when the actual rotation speed is less than the first rotation speed threshold value. A quantity calculation step;
In order to compensate for the transient response of the acceleration response that deteriorates according to the magnitude of the deterioration amount output in the deterioration amount calculating step, a rated resistance value that is predetermined for the resistance of the motor is output in the deterioration amount calculating step. A control correction amount calculation step for calculating and outputting a resistance value control correction amount for changing based on the deterioration amount;
In accordance with the resistance value of the motor changed based on the resistance value control correction amount output in the control correction amount calculation step, and a second difference corresponding to the difference between the target rotation speed and the actual rotation speed An electric motor control amount calculating step for calculating and outputting an electric motor control amount;
An electric supercharger control method comprising:

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