JP5049163B2 - Electric oil pump device - Google Patents

Description

  The present invention relates to an electric oil pump device, and more particularly to an electric oil pump device that electrically rotationally drives a fluid pressure feed pump that supplies hydraulic oil to an automatic transmission mechanism such as a hybrid vehicle.

It is known that a hydraulic pressure supply device used as a hydraulic pressure source of a vehicle transmission mechanism is driven by an electric oil pump device, and a predetermined hydraulic pressure necessary for the hydraulic pressure supply device is controlled and maintained by controlling the hydraulic pressure control device ( For example, see Patent Document 1).
Further, a torque control device for a permanent magnet synchronous motor is known that can realize highly accurate torque control even in the entire speed range from a low speed range to a high speed range (see, for example, Patent Document 2).
JP 2006-161850 A JP 2005-039912 A

  However, neither of Patent Documents 1 and 2 considers the mechanical loss amount of an electric oil pump device including a fluid pressure pump with respect to the drive signal of the brushless motor. Therefore, the actual torque supplied to the fluid circuit decreases due to the effects of mechanical loss that occurs in the brushless motor, fluid pump, and fluid circuit, etc., and the force (pressure) and amount (flow rate) originally required for the fluid circuit There was a problem of not being able to obtain.

  An object of the present invention is to provide an electric oil pump device that can be controlled so that an actual value matches a command value.

(1) In order to achieve the above object, the present invention provides a fluid pressure feed pump that supplies a fluid pressure to a fluid circuit, a brushless motor that provides a rotational driving force to the fluid pressure feed pump, and an external control of the brushless motor. have a control means for rotating in response to the signal, the automatic transmission an electric oil pump apparatus for supplying oil, the control unit, the brushless motor, the fluid pressure pump, and generated from the fluid circuit, the correction amount corresponding to the mechanical loss amount, e Bei correction means for applying a drive signal of the brushless motor, wherein the control signal is a torque command signal, said control means, the output torque of the brushless motor is the torque The control means controls so as to become a command value of the command signal, and the correction means adds the mechanical loss amount as a correction amount to the torque command value and outputs the motor output. Is corrected to torque, the correction weight is set in the loss characteristic table previously measured.
With this configuration, control can be performed so that the actual value matches the command value.

( 2 ) In the above ( 1 ), preferably, the mechanical loss amount is a loss generated according to the number of rotations of the brushless motor, and the correction means sets the mechanical loss amount as a correction amount to a torque command value. This is added to correct the motor output torque.

( 3 ) In the above ( 1 ), preferably, the mechanical loss amount is a loss generated according to a fluid temperature, and the correction means adds the mechanical loss amount as a correction amount to a torque command value. The motor output torque is corrected.

( 4 ) In the above ( 1 ), preferably, the mechanical loss amount is a loss generated according to a fluid pressure, and the correction means adds the mechanical loss amount as a correction amount to a torque command value. The motor output torque is corrected.

( 5 ) In the above ( 1 ), preferably, the mechanical loss amount is a loss generated according to the flow rate of the fluid, and the correction means adds the mechanical loss amount as a correction amount to the torque command value. The motor output torque is corrected.

  According to the present invention, control can be performed so that the actual torque matches the command torque.

Hereinafter, the configuration and operation of the electric oil pump device according to the first embodiment of the present invention will be described with reference to FIGS.
Initially, the whole structure of the electric oil pump apparatus by this embodiment is demonstrated using FIG.
FIG. 1 is a block diagram showing the overall configuration of the electric oil pump device according to the first embodiment of the present invention.

  The electric oil pump device 1 includes a brushless motor control device 3, a brushless motor 4, and an oil pump 5.

  The brushless motor control device 3 includes an internal DC power supply and converts DC power into AC power. Further, the brushless motor control device 3 controls the output torque of the brushless motor 4 by varying the three-phase AC power supplied to the brushless motor 4 based on a torque command from the control unit (ECU) 20. Note that the DC power supply may be provided outside the brushless motor control device 3.

  The brushless motor 4 is a permanent magnet field type synchronous motor driven by three-phase AC power. The rotation of the brushless motor 4 is controlled by electric power supplied from the brushless motor control device 3. The oil pump 5 is driven by the brushless motor 4.

  The oil stored in the oil pan 6 is sucked by the oil pump 5 and supplied to the automatic transmission mechanism 8 through the oil passages L1 and L2. The oil passage L2 is provided with a check valve 7 for preventing the oil from flowing backward from the automatic transmission mechanism 8 to the oil pump 5 side when the oil pump 5 is stopped. The oil that has lubricated the automatic transmission mechanism 8 is returned to the oil pan 6 through the oil passage L3.

  The automatic transmission mechanism 8 is provided with an oil temperature sensor 9 that detects the oil temperature of the oil. The oil temperature detected by the oil temperature sensor 9 is sent to a control unit (ECU) 20. The control unit (ECU) 20 outputs a torque command to the brushless motor control device 3 and also supplies oil temperature information of oil.

Next, the configuration of the brushless motor 4 used in the electric oil pump device according to the present embodiment will be described with reference to FIG.
FIG. 2 is a cross-sectional view showing a configuration of a brushless motor used in the electric oil pump device according to the first embodiment of the present invention.

  The brushless motor 4 includes a stator 405 fixed to the housing 404 and a rotor 406 fixed to the output shaft 401. Three-phase AC power is supplied to the armature winding of the stator 405 from the brushless motor control device 3 shown in FIG. The rotor 406 includes a permanent magnet 407 held on the outer periphery of the rotor core. The permanent magnet may be embedded in the rotor core.

  The output shaft 401 is held by the bracket 408 by a bearing 402F, and is held by the housing 404 by a bearing 402R. The rotor 406 can rotate with respect to the stator 405. An oil seal 403 is provided between the bracket 408 and the output shaft 401 to prevent oil from entering the motor.

  Here, the brushless motor 4 shown in FIG. 2 has the following losses. The first loss is a loss generated by friction between the inner ring, the outer ring, and the grease of the bearing 402 for rotating the shaft accurately and smoothly by the rotation of the output shaft 401. The second loss is a loss due to friction of the oil seal 403 to prevent oil from entering the motor. The characteristics of these losses vary depending on the motor speed and temperature. Due to the influence of these mechanical losses, the actual torque supplied to the automatic transmission mechanism 8 with respect to the command torque decreases, and the command torque and the actual torque do not match.

Next, the loss due to the oil agitation resistance in the electric oil pump device according to the present embodiment will be described with reference to FIG.
FIG. 3 is an explanatory diagram of loss due to oil agitation resistance in the electric oil pump device according to the first embodiment of the present invention.

  The loss in the oil pump 5 is that the oil in the oil pan 6 shown in FIG. 1 is lubricated to the automatic transmission mechanism 8 to drive the oil pump 5 so that the oil is lubricated and the oil stirring resistance is generated. Loss occurs. This loss varies with the viscosity of the oil.

  FIG. 3 shows the characteristics of mechanical loss due to oil agitation resistance obtained according to the motor speed and the oil temperature. In FIG. 3, the horizontal axis represents the motor rotation speed, and the vertical axis represents the loss torque.

  The torque loss due to oil agitation resistance increases as the motor speed increases. Further, as the oil temperature rises, the loss torque increases.

Next, the configuration of the brushless motor control device 3 used in the electric oil pump device according to the present embodiment will be described with reference to FIGS. 4 and 5.
FIG. 4 is a block diagram showing a configuration of a brushless motor control device used in the electric oil pump device according to the first embodiment of the present invention. FIG. 5 is a detailed block diagram of the torque correction unit in FIG. The same reference numerals as those in FIG. 1 indicate the same parts.

  As shown in FIG. 4, the brushless motor control device 3 that controls the driving of the brushless motor 4 includes a current converter 301, a voltage converter 302, a voltage command generator 303, a power converter 304, and a magnetic pole position estimation. And a speed estimation unit 305, a coordinate conversion unit 306, a phase current reproduction unit 307, a torque correction unit 308, a subtraction unit 309, a DC power supply VB, and a current detection unit S1.

  The control unit (ECU) 20 outputs a torque command τm * and an oil temperature To to the brushless motor control device 3.

  The torque correction unit 308 corrects the torque command τm * input from the control unit (ECU) 20 based on the oil temperature To and the estimated motor rotational speed ω1, and sets the corrected torque command τm * ′ as a current conversion unit. 301 is output. The content of the correction process in the torque correction unit 308 will be described later with reference to FIG.

  The current conversion unit 301 calculates the d-axis current command value Id * and the q-axis current command value Iq * based on the input correction torque command τm * ′, and outputs the calculated value to the subtraction unit 309.

  On the other hand, the phase current reproduction unit 307 receives the current Ist detected by the current detection unit S <b> 1 and outputs the reproduction currents Iu, Iv, and Iw that reproduce the three-phase current flowing through the brushless motor 4 to the coordinate conversion unit 306. The coordinate conversion unit 306 uses the reproduction currents Iu, Iv, and Iw that are the outputs of the phase current reproduction unit 307 and the magnetic pole position estimation value θc that is the output of the magnetic pole position estimation and speed estimation unit 305 to generate a quadrature rotor. Coordinates are converted to the dc-dq axes which are coordinates, and detection currents Idc and Iqc are output.

  The subtractor 309 calculates the deviation between the detected currents Idc and Iqc that are the outputs of the coordinate converter 306 and the current command values Id * and Iq * that are the outputs of the current converter 301. The voltage conversion unit 302 calculates voltage command values Vd * and Vq * such that the deviation between the detected current and the current command value is zero, and outputs the voltage command values Vd * and Vq * to the voltage command generation unit 303.

  The voltage command generation unit 303 calculates the three-phase voltage command values Vv, Vu, Vw using the output of the current control 302 and the estimated motor rotational speed ω1 that is the output of the magnetic pole position estimation and speed estimation unit 305, It outputs to the power converter 304. The power conversion unit 304 is an inverter that converts the DC power of the DC power supply VB into three-phase AC power. The power conversion unit 304 controls the voltage applied to the brushless motor 4 based on the output of the voltage command creation unit 303, rotates the brushless motor 4, and generates a desired torque.

  Next, the detailed correction contents of the torque correction unit 308 will be described with reference to FIG.

  The torque correction unit 308 receives in advance the command torque τm * sent from the ECU 20 via the signal line 22, the oil temperature To, and the estimated motor rotational speed ω1 that is the output of the magnetic pole position estimation and speed estimation unit 305. By setting a table of measured loss characteristics, a torque correction amount is calculated and a correction command torque is output.

  The torque correction unit 308 includes a loss characteristic table 308a and an addition unit 308b. The amount of mechanical loss due to the motor rotation speed and oil temperature, which causes mechanical loss, is measured in advance. This amount of mechanical loss includes the loss caused by the bearing 402 described above with reference to FIG. 2, the loss due to the friction of the oil seal 403, and the loss due to the oil stirring resistance in the oil pump 5 described above with reference to FIG. . The loss characteristic table 308a holds the above-described mechanical loss characteristics as a table.

  The torque correction unit 308 receives the information on the oil temperature To input from the ECU 20 to the brushless motor control device 3 and the estimated motor rotational speed ω1 that is the output of the magnetic pole position estimation and speed estimation unit 305 of the brushless motor control device 3. The torque correction amount τc is calculated using the loss characteristic table 308a. Further, the torque correction unit 308 outputs the corrected torque command τm * ′ by adding the torque correction amount τc to the torque command value τm * input from the ECU 20 to the brushless motor control device 3 by the adding unit 308b.

  Since the torque correction amount τc is a torque value for correcting the torque reduction amount due to mechanical loss, the current conversion unit 301, the voltage conversion unit 302, and the voltage command generation unit 303 are obtained so that the correction torque command τm * ′ is obtained. Then, the power conversion unit 304 and the subtraction unit 309 perform a feedback operation, so that a decrease in the actual torque of the electric pump can be prevented and the command torque and the actual torque can be matched.

  As described above, according to the present embodiment, the amount of mechanical loss generated from the brushless motor and the fluid pressure pump constituting the electric oil pump device, the fluid circuit, and the like is calculated in advance, and the value obtained thereby. Is added as a correction amount to the driving signal of the brushless motor to control the driving force, whereby the command torque and the actual torque supplied to the fluid circuit can be matched. Thereby, an electric oil pump device using a highly accurate brushless motor control device is obtained.

Next, the configuration and operation of the electric oil pump device according to the second embodiment of the present invention will be described with reference to FIGS. 6 and 7.
Initially, the whole structure of the electric oil pump apparatus by this embodiment is demonstrated using FIG.
FIG. 6 is a block diagram showing the overall configuration of the electric oil pump device according to the second embodiment of the present invention. The same reference numerals as those in FIG. 1 indicate the same parts.

  The basic configuration of this embodiment is the same as that shown in FIG. The difference from the embodiment of FIG. 1 is that the torque command value τm * is output from the ECU 20 to the electric oil pump device 1. Therefore, the brushless motor control device 3A controls the torque of the motor 4 based on the torque command value τm *.

  The basic configuration of the brushless motor control device 3A is the same as that shown in FIG. The difference from the embodiment of FIG. 4 is the configuration and operation of the torque correction unit 308, and the other configurations are the same.

Therefore, next, the configuration of the torque correction unit 308A of the brushless motor control device 3A used in the electric oil pump device according to the present embodiment will be described with reference to FIG.
FIG. 7 is a detailed block diagram of a torque correction unit in the electric oil pump device according to the second embodiment of the present invention. The same reference numerals as those in FIG. 4 indicate the same parts.

  The torque correction unit 308A receives the command torque τm * sent from the ECU 20 via the signal line 22 and the estimated motor rotational speed ω1 that is the output of the magnetic pole position estimation and speed estimation unit 305, and has a loss characteristic measured in advance. By setting a table, a torque correction amount is calculated and a correction command torque is output.

  The torque correction unit 308A includes a loss characteristic table 308Aa and an addition unit 308b. The amount of mechanical loss due to the motor rotation speed, which causes mechanical loss, is measured in advance. This amount of mechanical loss includes the loss caused by the bearing 402 described above with reference to FIG. 2, the loss due to the friction of the oil seal 403, and the loss due to the oil stirring resistance in the oil pump 5 described above with reference to FIG. . The loss characteristic table 308Aa holds the above-described mechanical loss characteristics in a table.

  The torque correction unit 308A calculates the torque correction amount τcA using the loss characteristic table 308Aa with the estimated motor rotation speed ω1 output from the magnetic pole position estimation and speed estimation unit 305 of the brushless motor control device 3 as an input. Further, the torque correction unit 308A outputs the corrected torque command τm * ′ by adding the torque correction amount τcA to the torque command value τm * input from the ECU 20 to the brushless motor control device 3 by the adding unit 308b.

  Since the torque correction amount τcA is a torque value for correcting the torque decrease amount due to mechanical loss, the current conversion unit 301, the voltage conversion unit 302, and the voltage command generation unit 303 are obtained so that the correction torque command τm * ′ is obtained. Then, the power conversion unit 304 and the subtraction unit 309 perform a feedback operation, so that a decrease in the actual torque of the electric pump can be prevented and the command torque and the actual torque can be matched.

  As described above, according to this embodiment as well, the amount of mechanical loss generated from the brushless motor and the fluid pressure pump constituting the electric oil pump device, the fluid circuit, and the like is calculated in advance, and the value obtained thereby is calculated. By controlling the driving force in addition to the driving signal of the brushless motor as a correction amount, the command torque and the actual torque supplied to the fluid circuit can be matched. Thereby, an electric oil pump device using a highly accurate brushless motor control device is obtained.

Next, the configuration and operation of the electric oil pump device according to the third embodiment of the present invention will be described with reference to FIGS.
Initially, the whole structure of the electric oil pump apparatus by this embodiment is demonstrated using FIG.
FIG. 8 is a block diagram showing the overall configuration of the electric oil pump device according to the third embodiment of the present invention. The same reference numerals as those in FIG. 1 indicate the same parts.

  The basic configuration of this embodiment is the same as that shown in FIG. The difference from the embodiment of FIG. 1 is that the brushless motor control device 3B controls the torque of the motor 4 based on the torque command value τm * and the oil temperature T0. As shown in FIG. The estimated motor rotation speed ω1 is not used.

  The basic configuration of the brushless motor control device 3B is the same as that shown in FIG. The difference from the embodiment of FIG. 4 is the configuration and operation of the torque correction unit 308, and the other configurations are the same.

Therefore, next, the configuration of the torque correction unit 308B of the brushless motor control device 3B used in the electric oil pump device according to the present embodiment will be described with reference to FIG.
FIG. 9 is a detailed block diagram of the torque correction unit in the electric oil pump device according to the third embodiment of the present invention. The same reference numerals as those in FIG. 4 indicate the same parts.

  The torque correction unit 308B receives the command torque τm * sent from the ECU 20 via the signal line 22 and the oil temperature To as an input, and sets a previously measured loss characteristic table to set the torque correction amount. It calculates and outputs a correction command torque.

  The torque correction unit 308B includes a loss characteristic table 308Ba and an addition unit 308b. The amount of mechanical loss due to the motor rotation speed, which causes mechanical loss, is measured in advance. This amount of mechanical loss includes the loss caused by the bearing 402 described above with reference to FIG. 2, the loss due to the friction of the oil seal 403, and the loss due to the oil stirring resistance in the oil pump 5 described above with reference to FIG. . The loss characteristic table 308Ba holds the above-described mechanical loss characteristics in a table.

  The torque correction unit 308B receives the oil temperature To and calculates the torque correction amount τcB using the loss characteristic table 308Ba. Further, the torque correction unit 308B outputs the corrected torque command τm * ′ by adding the torque correction amount τcB to the torque command value τm * input from the ECU 20 to the brushless motor control device 3 by the adding unit 308b.

  Since the torque correction amount τcB is a torque value for correcting the torque decrease amount due to mechanical loss, the current conversion unit 301, the voltage conversion unit 302, and the voltage command generation unit 303 are obtained so that the correction torque command τm * ′ is obtained. Then, the power conversion unit 304 and the subtraction unit 309 perform a feedback operation, so that a decrease in the actual torque of the electric pump can be prevented and the command torque and the actual torque can be matched.

  As described above, according to this embodiment as well, the amount of mechanical loss generated from the brushless motor and the fluid pressure pump constituting the electric oil pump device, the fluid circuit, and the like is calculated in advance, and the value obtained thereby is calculated. By controlling the driving force in addition to the driving signal of the brushless motor as a correction amount, the command torque and the actual torque supplied to the fluid circuit can be matched. Thereby, an electric oil pump device using a highly accurate brushless motor control device is obtained.

Next, the configuration and operation of the electric oil pump device according to the fourth embodiment of the present invention will be described with reference to FIGS. 10 and 11.
Initially, the whole structure of the electric oil pump apparatus by this embodiment is demonstrated using FIG.
FIG. 10 is a block diagram showing the overall configuration of the electric oil pump device according to the fourth embodiment of the present invention. The same reference numerals as those in FIG. 1 indicate the same parts.

  The basic configuration of this embodiment is the same as that shown in FIG. 1 is different from the embodiment of FIG. 1 in that a hydraulic pressure sensor 10 for detecting the pressure P of oil supplied from the pump 5 to the automatic transmission 9 is provided. The oil pressure P detected by the oil pressure sensor 10 is input to the ECU 20. Note that the mounting position of the hydraulic sensor 10 may be the automatic transmission 8 or the pipe L2 as shown in the figure. Information on the pressure P input to the ECU 20 is output to the electric oil pump device 1. The brushless motor control device 3C is a point that controls the torque of the motor 4 based on the torque command value τm * and the hydraulic pressure P, and does not use the estimated motor rotational speed ω1 shown in FIG.

  The basic configuration of the brushless motor control device 3C is the same as that shown in FIG. The difference from the embodiment of FIG. 4 is the configuration and operation of the torque correction unit 308, and the other configurations are the same.

Therefore, next, the configuration of the torque correction unit 308C of the brushless motor control device 3C used in the electric oil pump device according to the present embodiment will be described with reference to FIG.
FIG. 11 is a detailed block diagram of a torque correction unit in the electric oil pump device according to the fourth embodiment of the present invention. The same reference numerals as those in FIG. 4 indicate the same parts.

  The torque correction unit 308C calculates the torque correction amount by setting a table of loss characteristics measured in advance by using the command torque τm * sent from the ECU 20 via the signal line 22 and the hydraulic pressure P as inputs. Then, a correction command torque is output.

  The torque correction unit 308C includes a loss characteristic table 308Ca and an addition unit 308C. The amount of mechanical loss due to the motor rotation speed, which causes mechanical loss, is measured in advance. This amount of mechanical loss includes the loss caused by the bearing 402 described above with reference to FIG. 2, the loss due to the friction of the oil seal 403, and the loss due to the oil stirring resistance in the oil pump 5 described above with reference to FIG. . The loss characteristic table 308Ca holds the mechanical loss characteristics described above in a table.

  The torque correction unit 308C receives the hydraulic pressure P and calculates the torque correction amount τcC using the loss characteristic table 308Ca. Further, the torque correction unit 308C outputs a corrected torque command τm * ′ by adding the torque correction amount τcC to the torque command value τm * input from the ECU 20 to the brushless motor control device 3 by the adding unit 308C.

  Since the torque correction amount τcC is a torque value for correcting the torque decrease amount due to mechanical loss, the current conversion unit 301, the voltage conversion unit 302, and the voltage command generation unit 303 are obtained so that the correction torque command τm * ′ is obtained. Then, the power conversion unit 304 and the subtraction unit 309 perform a feedback operation, so that a decrease in the actual torque of the electric pump can be prevented and the command torque and the actual torque can be matched.

  As described above, according to this embodiment as well, the amount of mechanical loss generated from the brushless motor and the fluid pressure pump constituting the electric oil pump device, the fluid circuit, and the like is calculated in advance, and the value obtained thereby is calculated. By controlling the driving force in addition to the driving signal of the brushless motor as a correction amount, the command torque and the actual torque supplied to the fluid circuit can be matched. Thereby, an electric oil pump device using a highly accurate brushless motor control device is obtained.

Next, the configuration and operation of the electric oil pump device according to the fifth embodiment of the present invention will be described with reference to FIGS. 12 and 13.
Initially, the whole structure of the electric oil pump apparatus by this embodiment is demonstrated using FIG.
FIG. 12 is a block diagram showing the overall configuration of the electric oil pump device according to the fifth embodiment of the present invention. The same reference numerals as those in FIG. 1 indicate the same parts.

  The basic configuration of this embodiment is the same as that shown in FIG. A difference from the embodiment of FIG. 1 is that a flow rate sensor 11 for detecting a flow rate Q of oil supplied from the pump 5 to the automatic transmission 9 is provided. The flow rate Q detected by the flow rate sensor 11 is input to the ECU 20. The attachment position of the flow sensor 11 may be the automatic transmission 8 or the pipe L2 as shown in the figure. Information on the flow rate Q input to the ECU 20 is output to the electric oil pump device 1. The brushless motor control device 3D controls the torque of the motor 4 based on the torque command value τm * and the flow rate Q, and does not use the estimated motor rotational speed ω1 shown in FIG.

  The basic configuration of the brushless motor control device 3D is the same as that shown in FIG. The difference from the embodiment of FIG. 4 is the configuration and operation of the torque correction unit 308, and the other configurations are the same.

Therefore, next, the configuration of the torque correction unit 308D of the brushless motor control device 3D used in the electric oil pump device according to the present embodiment will be described with reference to FIG.
FIG. 13 is a detailed block diagram of a torque correction unit in the electric oil pump device according to the fifth embodiment of the present invention. The same reference numerals as those in FIG. 4 indicate the same parts.

  The torque correction unit 308D calculates a torque correction amount by setting a previously measured loss characteristic table with the command torque τm * sent from the ECU 20 via the signal line 22 and the flow rate Q as inputs. Then, a correction command torque is output.

  The torque correction unit 308D includes a loss characteristic table 308Da and an addition unit 308D. The amount of mechanical loss due to the motor rotation speed, which causes mechanical loss, is measured in advance. This amount of mechanical loss includes the loss caused by the bearing 402 described above with reference to FIG. 2, the loss due to the friction of the oil seal 403, and the loss due to the oil stirring resistance in the oil pump 5 described above with reference to FIG. . The loss characteristic table 308Da holds the above-described mechanical loss characteristics in a table.

  The torque correction unit 308D receives the flow rate Q and calculates the torque correction amount τcC using the loss characteristic table 308Da. Further, the torque correction unit 308D outputs the corrected torque command τm * ′ by adding the torque correction amount τcC to the torque command value τm * input from the ECU 20 to the brushless motor control device 3 by the adding unit 308D.

  Since the torque correction amount τcC is a torque value for correcting the torque decrease amount due to mechanical loss, the current conversion unit 301, the voltage conversion unit 302, and the voltage command generation unit 303 are obtained so that the correction torque command τm * ′ is obtained. Then, the power conversion unit 304 and the subtraction unit 309 perform a feedback operation, so that a decrease in the actual torque of the electric pump can be prevented and the command torque and the actual torque can be matched.

  As described above, according to this embodiment as well, the amount of mechanical loss generated from the brushless motor and the fluid pressure pump constituting the electric oil pump device, the fluid circuit, and the like is calculated in advance, and the value obtained thereby is calculated. By controlling the driving force in addition to the driving signal of the brushless motor as a correction amount, the command torque and the actual torque supplied to the fluid circuit can be matched. Thereby, an electric oil pump device using a highly accurate brushless motor control device is obtained.

Next, the configuration and operation of the electric oil pump device according to the sixth embodiment of the present invention will be described with reference to FIGS. 14 and 15.
Initially, the whole structure of the electric oil pump apparatus by this embodiment is demonstrated using FIG.
FIG. 14 is a block diagram showing an overall configuration of an electric oil pump device according to a sixth embodiment of the present invention. The same reference numerals as those in FIG. 1 indicate the same parts.

  The basic configuration of this embodiment is the same as that shown in FIG. The brushless motor control device 3 shown in FIG. 1 controls the torque of the motor 4 based on the torque command value τm *, whereas the brushless motor control device 3E of the present embodiment has a rotational speed command value. Based on ωm *, the rotational speed of the motor 4 is controlled. The command rotation speed ωm * and the oil temperature T are input from the ECU 20 to the brushless motor control device 3E.

Next, the configuration of the brushless motor control device 3E used in the electric oil pump device according to the present embodiment will be described with reference to FIG.
FIG. 15: is a block diagram which shows the structure of the brushless motor control apparatus used for the electric oil pump apparatus by the 6th Embodiment of this invention. Note that the same reference numerals as those in FIG. 14 denote the same parts.

  As shown in FIG. 15, the brushless motor control device 3 that controls the driving of the brushless motor 4 includes a current converter 301, a voltage converter 302, a voltage command generator 303, a power converter 304, and a magnetic pole position estimation. And the speed estimation unit 305, the coordinate conversion unit 306, the phase current reproduction unit 307, the subtraction unit 309, the speed control unit 310, the current correction unit 311, the subtraction unit 312, the DC power supply VB, and the current detection unit. S1.

  Configurations and operations other than the speed control unit 310, the current correction unit 311 and the subtraction unit 312 are the same as those in FIG.

  The subtractor 312 calculates the difference between the estimated motor rotation speed ω1 that is the output of the magnetic pole position estimation and speed estimation section 305 and the command rotation speed ωm * input from the ECU 20.

  The speed control unit 310 calculates a d-axis current command value Id * and a q-axis current command value Iq * such that the speed difference (rotational speed difference) calculated by the subtraction unit 312 becomes zero, and a current correction unit. 311 is output.

  Information on the oil temperature T0 is input from the ECU 20 to the current correction unit 311. The current correction unit 311 corrects the current command based on the oil temperature T0. The current correction unit 311 receives a table of loss characteristics that are measured and set in advance with respect to the d-axis current command value Id * and the q-axis current command value Iq * output from the speed control unit 310, using the oil temperature To as an input. Using this, the current correction amount is calculated and the current correction amount is added to output a correction command current.

  Since the current correction amount is a current value for correcting the torque reduction amount due to mechanical loss, the speed control unit 310, the voltage conversion unit 302, the voltage command generation unit 303, and the power conversion so that a correction current command is obtained. Since the unit 304 and the subtracting unit 309 perform a feedback operation, a decrease in the actual torque of the electric pump can be prevented, and the actual rotation speed can be matched with the command rotation speed.

  In this embodiment, the speed control system is used and the current command value is corrected by the oil temperature T0. However, the oil pressure P shown in FIG. 11 and the oil flow rate Q shown in FIG. Accordingly, the current command value can be corrected.

As described above, according to the present embodiment, the amount of mechanical loss generated from the brushless motor and the fluid pressure pump constituting the electric oil pump device, the fluid circuit, and the like is calculated in advance, and the value obtained thereby. Is added as a correction amount to the driving signal of the brushless motor to control the driving force, whereby the command torque and the actual torque supplied to the fluid circuit can be matched. Thereby, an electric oil pump device using a highly accurate brushless motor control device is obtained.

1 is a block diagram illustrating an overall configuration of an electric oil pump device according to a first embodiment of the present invention. It is sectional drawing which shows the structure of the brushless motor used for the electric oil pump apparatus by the 1st Embodiment of this invention. It is explanatory drawing of a loss by the stirring resistance of the oil in the electric oil pump apparatus by the 1st Embodiment of this invention. It is a block diagram which shows the structure of the brushless motor control apparatus used for the electric oil pump apparatus by the 1st Embodiment of this invention. FIG. 5 is a detailed block diagram of a torque correction unit in FIG. 4. It is a block diagram which shows the whole structure of the electric oil pump apparatus by the 2nd Embodiment of this invention. It is a detailed block diagram of the torque correction part in the electric oil pump apparatus by the 2nd Embodiment of this invention. It is a block diagram which shows the whole structure of the electric oil pump apparatus by the 3rd Embodiment of this invention. It is a detailed block diagram of the torque correction part in the electric oil pump apparatus by the 3rd Embodiment of this invention. It is a block diagram which shows the whole structure of the electric oil pump apparatus by the 4th Embodiment of this invention. It is a detailed block diagram of the torque correction part in the electric oil pump apparatus by the 4th Embodiment of this invention. It is a block diagram which shows the whole structure of the electric oil pump apparatus by the 5th Embodiment of this invention. It is a detailed block diagram of the torque correction part in the electric oil pump apparatus by the 5th Embodiment of this invention. It is a block diagram which shows the whole structure of the electric oil pump apparatus by the 6th Embodiment of this invention. It is a block diagram which shows the structure of the brushless motor control apparatus used for the electric oil pump apparatus by the 6th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric oil pump apparatus 2 ... Fluid circuit 3 ... Brushless motor control apparatus 4 ... Brushless motor 5 ... Fluid pressure feed pump 9 ... Oil temperature sensor 20 ... Control unit (ECU)
308 ... Torque correction unit

Claims (5)

Possess a fluid pressure pump for supplying a fluid pressure to the fluid circuit, and a brushless motor providing a rotational driving force to the fluid pressure pump, a control means for rotating in response to an external control signal to the brushless motor, the automatic transmission the electric oil pump apparatus for supplying oil to the machine,
The control means, the brushless motor, the fluid pressure pump, and a correction amount corresponding to the mechanical loss amount generated from the fluid circuit and the like, e Bei correction means for applying a drive signal of the brushless motor,
The control signal is a torque command signal,
The control means controls the output torque of the brushless motor to be a command value of the torque command signal,
The correction means corrects the motor output torque by adding the mechanical loss amount as a correction amount to a torque command value,
The electric oil pump device characterized in that the correction amount is set in a loss characteristic table measured in advance . The electric oil pump device according to claim 1 ,
The amount of mechanical loss is a loss that occurs according to the number of rotations of the brushless motor,
The electric oil pump device, wherein the correction means corrects the motor output torque by adding the mechanical loss amount as a correction amount to a torque command value. The electric oil pump device according to claim 1 ,
The amount of mechanical loss is a loss generated according to the temperature of the fluid,
The electric oil pump device, wherein the correction means corrects the motor output torque by adding the mechanical loss amount as a correction amount to a torque command value. The electric oil pump device according to claim 1 ,
The amount of mechanical loss is a loss generated according to the pressure of the fluid,
The electric oil pump device, wherein the correction means corrects the motor output torque by adding the mechanical loss amount as a correction amount to a torque command value. The electric oil pump device according to claim 1 ,
The amount of mechanical loss is a loss generated according to the flow rate of the fluid,
The electric oil pump device, wherein the correction means corrects the motor output torque by adding the mechanical loss amount as a correction amount to a torque command value.

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