JP4136956B2 - Sensorless brushless motor oil pump controller - Google Patents

Description

  The present invention relates to a brushless motor that does not include a sensor such as a resolver that detects the rotational angle position of an armature (rotor), that is, an oil pump control device that uses a sensorless brushless motor.

  Since the brushless motor does not have a brush as the name suggests, there are few members that wear with rotation and sliding, and the durability is excellent. On the other hand, it is necessary to detect the rotational angle position of the armature in order to control the current to the coil, and a brushless motor provided with a resolver is known as an example. However, this type of motor has problems such as an increase in size of the entire structure or inferior high-temperature durability due to the provision of a sensor such as a resolver.

  Therefore, for example, Patent Document 1 describes a vehicle driving force transmission device configured to drive an oil pump by a sensorless brushless motor. The apparatus described in Patent Document 1 will be briefly described. Since the sensorless brushless motor is a motor that controls the back electromotive force as a so-called feedback signal, a low-frequency alternating current is generated at the time of starting when the back electromotive force is not generated. Is supplied to the field winding, and as a result, after the armature starts to rotate, the motor is controlled based on the counter electromotive force. That is, the control at the time of starting the sensorless brushless motor which has stopped is disclosed. By using a sensorless brushless motor, the high temperature durability can be improved and space saving can be achieved.

  Patent Document 2 describes a device configured to generate an oil pressure by driving an oil pump with an electric motor. In the invention of Patent Document 2, the oil temperature is low and the oil viscosity is high. In this case, the electric motor is driven earlier than when the viscosity is low, and the duty ratio is driven at 100% (full output).

By the way, a vehicle such as an automobile normally includes an oil pump driven by a main power source such as an engine. However, in a vehicle including a power source other than the main power source such as a hybrid vehicle, the main power source is used. If the is not driven, the hydraulic pressure cannot be obtained. For example, the hybrid drive device described in Patent Document 3 is a so-called mechanical distribution type in which a motor / generator that mainly assists drive torque is connected to an output shaft via a transmission. The device can run using only the motor / generator for the torque assist. In that case, since the oil pressure cannot be obtained by the oil pump driven by the engine by stopping the engine, the above-described sensorless brushless motor type oil pump or electric oil pump is used as an oil pump for generating the oil pressure for the transmission. It is possible to use.
JP 2003-182391 A JP 2000-142435 A JP 2002-225578 A

  As described in Patent Document 1 described above, the sensorless brushless motor is advantageous for space saving and is excellent in high temperature durability, and thus is effective as a vehicle-mounted motor. However, when this is used as a drive source for an oil pump, there is still room for improvement in terms of control, and a new control technology has to be developed. That is, when the oil temperature is low and the viscosity is high, a large torque is required for the oil pump. However, if the motor output is constant, increasing the output torque decreases the rotational speed and decreases the discharge amount. As a result, the hydraulic pressure in the hydraulic circuit is lowered, and conversely, if the rotational speed is increased so as to increase the discharge amount in order to ensure the hydraulic pressure in the hydraulic circuit, the output is the product of the rotational speed and torque. As a result, the torque decreases, and eventually the rotational speed does not increase.

  On the other hand, in an electric oil pump using a sensorless brushless motor, an accurate rotation speed signal or rotation position signal cannot be obtained at a low rotation speed, so the rotation speed must be lowered due to low oil temperature. Cannot perform rotation speed control based on the detection signal.

  Since the device described in Patent Document 1 is only control when starting the sensorless brushless motor, even when the oil viscosity is high at a very low temperature, even after the armature starts to rotate. Since the rotational speed does not increase, the back electromotive force is low. As a result, the substantial rotational speed control cannot be performed, and the required hydraulic pressure may not be obtained.

  Further, as described in Patent Document 2, even if the start-up of the electric oil pump at a low temperature is accelerated, the sensorless brushless motor, as described above, has a low oil rotation speed due to high oil viscosity. Since the substantial number of revolutions cannot be controlled because the back electromotive force is low, there is a possibility that the required oil pressure cannot be obtained even if the start-up time is advanced.

  The present invention has been made paying attention to the above technical problem, and is a control device for driving an oil pump using a sensorless brushless motor, and can provide a required oil pressure or discharge amount regardless of the oil temperature. An object of the present invention is to provide a control device that can be secured.

In order to achieve the above object, a first aspect of the invention relates to a sensorless brushless motor type oil pump control device that drives an oil pump by a sensorless brushless motor controlled based on a counter electromotive force. constant supplies a determining unit, a rotation speed instruction means for outputting a signal for rotating the pre-Symbol sensorless brushless motor at a predetermined rotational speed, a constant voltage to the sensor-less brushless motor instead of the signal output by the rotational speed command means Constant voltage control means for performing voltage control, and when the low temperature state is determined by the temperature determination means, a control for rotating the sensorless brushless motor at the predetermined rotation speed by a signal output from the rotation speed command means And the sensorless brush according to a signal output from the rotational speed command means When it is determined that the temperature determination means is in a non-low temperature state after starting the motor, or when a predetermined time has elapsed from the time when the rotation is instructed by a signal output from the rotation speed command means, the constant voltage control means The control device is configured to switch the sensorless brushless motor to the constant voltage control .

Furthermore, the invention of claim 3 is the sensorless system according to claim 1 , wherein the oil pump is configured to supply hydraulic pressure to a transmission mechanism that engages with hydraulic pressure and transmits torque. It is a control apparatus of a brushless motor type oil pump.

According to a third aspect of the present invention, in the second aspect of the present invention, the transmission mechanism distributes the output torque of the internal combustion engine to the power generation mechanism and the output member, and the output member receives the torque of the motor via the transmission. Including the transmission in the mechanical distribution type hybrid drive device for transmitting, wherein the temperature determining means includes means for determining an oil temperature at the start of the hybrid drive device, and the rotation speed command means is for starting the hybrid drive device And a start time command means for outputting a rotation speed command signal to the sensorless brushless motor when the oil temperature at the time is equal to or lower than a predetermined temperature.

According to the invention of claim 1, the oil pump is driven by the sensorless brushless motor to generate hydraulic pressure. In this case, when it is determined that the temperature such as the oil temperature or the atmospheric temperature is in a low temperature state, a signal for rotating the sensorless brushless motor at a predetermined rotational speed is output. That is, the rotational speed of the sensorless brushless motor type oil pump is controlled. As a result, even if the viscosity of the oil is high due to the low temperature, the rotational speed is controlled so that the sensorless brushless motor rotates at a predetermined rotational speed against the resistance force caused by the high-viscosity oil. Ru can be secured discharge amount and pressure of oil by the pump. In addition, the above-described rotation speed control is executed at the time of start-up in a low temperature state, and after that, when a predetermined time elapses or it is determined that the sensorless brushless motor is in a non-low temperature state, the sensorless brushless motor is controlled at a constant voltage. Can be switched. Therefore, in a state where the viscosity of the oil is low, the limit of the rotation speed of the sensorless brushless motor type oil pump is released, and the rotation speed increases according to the situation, so that the oil discharge amount increases, Since the oil temperature is relatively high, the oil pressure can be secured even if the amount of oil leakage increases.

Furthermore, according to the invention of claim 2, since the hydraulic pressure can be ensured in any of the low temperature state and the subsequent oil temperature state, the torque capacity of the transmission mechanism can be maintained as necessary. it can.

According to the third aspect of the present invention, even when the mechanical distribution type hybrid drive device is started at a low temperature, the sensorless brushless motor can rotate at a predetermined number of rotations to generate hydraulic pressure at the time of startup. Therefore, even when starting with an electric motor, the torque capacity of the transmission can be ensured and the starting by the electric motor can be performed reliably.

  Next, the present invention will be specifically described with reference to the drawings. The present invention can be applied to a control device for an electric oil pump used in a hybrid drive device as an example. First, an example of the hybrid drive device will be described. The drive device in the hybrid vehicle Ve shown in FIG. 2 is configured as follows. The vehicle Ve shown in FIG. 2 is an F / R (front engine / rear drive; engine front and rear wheel drive) type vehicle and has an engine 1 as a first driving force source. As the engine 1, an internal combustion engine such as a gasoline engine, a diesel engine, or an LPG engine can be used.

  An input shaft 4 is connected to the crankshaft 2 of the engine 1 via a damper mechanism 3. Two motor generators, a first motor / generator 6 and a second motor / generator 7, are provided inside the casing 5 that accommodates the entire drive device. As these motor generators 6 and 7, a motor generator having both a power running function for converting electrical energy into mechanical energy and a regeneration function for converting mechanical energy into electrical energy can be used.

  The hybrid drive apparatus shown in FIG. 2 is of a so-called mechanical distribution type, and distributes the torque output from the engine 1 to the first motor / generator 6 and the output shaft 8 serving as an output member. 9 is provided. The power distribution device 9 is configured by a single pinion type planetary gear mechanism, and includes a sun gear 11 formed on a hollow shaft 10, a ring gear 12 that is an internal gear disposed concentrically with the sun gear 11, and a sun gear. 11 and a carrier 14 holding a pinion gear 13 that meshes with the ring gear 12. The input shaft 4 and the carrier 14 are coupled so as to rotate integrally. The output shaft 8 is connected to the ring gear 12. Further, the input shaft 4 is inserted into the hollow shaft 10 so as to be relatively rotatable, and the rotor 15 and the sun gear 11 in the first motor / generator 6 are connected via the hollow shaft 10. The stator 16 in the first motor / generator 6 is fixed to the casing 5.

On the other hand, the second motor / generator 7 corresponds to the electric motor of the present invention (Claim 3) , and includes a stator 17 and a rotor 18. The stator 17 is fixed to the casing 5, while the rotor 18 is connected to the output shaft 8 via a transmission 19. The transmission 19 is mainly composed of a planetary gear mechanism, and includes a first sun gear 20 and a ring gear 21 arranged concentrically, and a first pinion gear meshing with the first sun gear 20 and the ring gear 21. 22, a second sun gear 23 disposed adjacent to and on the same axis as the first sun gear 20, a small-diameter pinion gear 24 meshing with the second sun gear 23, and the small-diameter pinion gear 24 integral with the first sun gear 23. A large-diameter pinion gear 25 meshing with the pinion gear 22 and a carrier 26 holding the pinion gears 22, 24, 25 so as to rotate and revolve freely. Therefore, the first sun gear 20, the ring gear 21, and the carrier 26 holding the first pinion gear 22 meshed with the first sun gear 20 and the ring gear 21 constitute a single pinion type planetary gear mechanism. The double sun gear 23, the ring gear 21, and the large and small pinion gears 24, 25 disposed between them and the carrier 26 holding the first pinion gear 22 constitute a double pinion type planetary gear mechanism. . That is, the transmission 19 shown in FIG. 2 is mainly composed of a Ravigneaux planetary gear mechanism. The transmission 19 can also be configured by a planetary gear mechanism having a composite structure in which a plurality of planetary gear mechanisms such as a single pinion type planetary gear mechanism and a double pinion type planetary gear mechanism are combined.

  The carrier 26 is connected to the output shaft 8 so as to rotate integrally. The input shaft 4 and the output shaft 8 are disposed on the same axis.

  Further, a hollow shaft 27 is fitted on the outer peripheral side of the output shaft 8 so as to be relatively rotatable, and the hollow shaft 27 and the rotor 18 of the motor / generator 7 are connected to rotate integrally. That is, the second motor / generator 7 is connected to the first sun gear 20 via the hollow shaft 27.

  Further, a first brake B1 that selectively stops the rotation of the sun gear 28 and a second brake B2 that selectively stops the rotation of the ring gear 21 are provided. The output shaft 8 and the input member (not shown) of the differential 28 are connected by a propeller shaft (not shown). Further, the rotating member (not shown) of the differential 28 and the drive shaft 29 are connected. Further, wheels 30 are connected to the drive shaft 29. In this way, the engine 1 and the second motor / generator 7 are connected to the same wheel 30 so as to be able to transmit power, and can be driven by either the power of the engine 1 or the power of the second motor / generator 7. ing.

  Next, a control system of the vehicle Ve will be described. An electronic control unit (ECU) 31 for controlling the entire hybrid drive device is provided. The electronic control unit 31 includes a signal indicating a request for starting / stopping the engine 1 and a control request for the motor generators 6 and 7. A signal, a shift position selection signal, a signal indicating a vehicle speed, a signal indicating an acceleration request, a signal indicating a braking request, a signal indicating an engine speed, a signal indicating the state of the hydraulic control device 32, and the like are input. Examples of the shift position detected by the shift position sensor include a P (parking) position, an R (reverse) position, an N (neutral) position, and a D (drive) position. Here, the P position and the N position are positions that are selected when the transmission is in a state in which power cannot be transmitted (non-driving state, non-running state), and the D position and the reverse position are the positions of the transmission 19. This position is selected when the power can be transmitted (driving state, traveling state).

  In contrast, the electronic control device 31 outputs a signal for controlling the engine 1, a signal for controlling the motor / generators 6, 7, a signal for controlling the hydraulic control device 32, and the like. The hydraulic control device 32 will be described later. The brakes B1 and B2 are engaged and released according to the hydraulic pressure transmitted from the hydraulic control device 32 to the brakes B1 and B2.

  As shown in FIG. 3, the hydraulic control device 32 adjusts the hydraulic pressure generated by the mechanical oil pump 33, the electric oil pump 34, and the oil pumps 33 and 34 to the line pressure, and restores the line pressure to the original pressure. And a hydraulic circuit 35 that supplies and discharges the hydraulic pressure adjusted as pressure to the brakes B1 and B2 and supplies oil for lubrication to appropriate locations. The mechanical oil pump 33 is a pump that is driven by the engine 1 and generates hydraulic pressure. For example, the mechanical oil pump 33 is coaxially arranged on the output side of the damper mechanism 3 and receives torque from the engine 1 to operate. ing. On the other hand, the electric oil pump 34 is a pump driven by a sensorless brushless motor 36, as shown in FIG. 4, and is attached to an appropriate place such as the outside of a casing (not shown), and is used for a battery or the like. It operates by receiving electric power from the power storage device and generates hydraulic pressure.

  The sensorless brushless motor 36 is, for example, a permanent magnet type three-phase AC synchronous motor, and is configured to rotate by being supplied with U-phase, V-phase, and W-phase field currents from the controller 37. The field current is controlled based on the back electromotive force accompanying the rotation of the armature (rotor: not shown) in a state where the rotational speed is higher than the predetermined rotational speed, and is lower than the predetermined rotational speed. In this state, it is set to a predetermined frequency and is output as a rotation speed instruction signal. That is, at a predetermined rotation speed (for example, 200 to 300 rpm) or more, control is performed so as to synchronize at a constant voltage, and in contrast, control for instructing a predetermined rotation speed is executed when the rotation speed is lower than the predetermined rotation speed. In this case, the output torque is ensured by keeping the output constant. In particular, in the present invention, the controller 37 is configured to switch between the control at the constant voltage and the control based on the rotational speed command signal based on the temperature such as the ambient temperature or the oil temperature.

  On the discharge side of the oil pumps 33 and 34, check valves 38 and 39 that are opened by the discharge pressure of the oil pumps 33 and 34 and are closed in the opposite direction are provided. On the other hand, these oil pumps 33 and 34 are connected in parallel to each other. In addition, a valve (not shown) that regulates the line pressure increases the discharge amount to increase the line pressure, and conversely controls the line pressure to reduce the discharge amount to lower the line pressure. Is configured to do.

  Since the hybrid drive device described above includes two power sources, the engine 1 and the second motor / generator 7, these are effectively used to perform an operation with low fuel consumption and a small amount of exhaust gas. Even when the engine 1 is driven, the rotational speed of the engine 1 is controlled by the first motor / generator 6 so as to achieve optimum fuel consumption. Further, the inertia energy of the vehicle is regenerated as electric power during the coast. When the second motor / generator 7 is driven for torque assist, when the vehicle speed is low, the transmission 19 is set to the low speed stage L, the torque applied to the output shaft 8 is increased, and the vehicle speed is increased. Then, the transmission 19 is set to the high speed stage H, the rotational speed of the second motor / generator 7 is relatively lowered to reduce the loss, and efficient torque assist is executed.

  The hybrid vehicle described above can be driven by the power of the engine 1, travel using the engine 1 and the second motor / generator 7, and travel using only the second motor / generator 7. These travel modes are determined and selected based on the required driving amount such as the accelerator opening degree, the vehicle speed, and the like. For example, when the amount of charge of the battery is sufficient and the required drive amount is relatively small, or when a quiet start is selected by manual operation, it is similar to an electric vehicle using the second motor / generator 7. The running mode is selected and the engine 1 is stopped.

  When starting or running using the second motor / generator 7, the engine 1 is stopped, so the mechanical oil pump 33 is stopped and no hydraulic pressure is generated. Further, since the torque of the second motor / generator 7 is transmitted to the output shaft 8 through the transmission 19, it is necessary to set the transmission 19 in a state capable of transmitting torque. Specifically, it is necessary to supply the hydraulic pressure to the second brake B2 that sets the low speed stage L so as to be engaged. In this case, if the oil viscosity is high due to the low oil temperature, the resistance to the sensorless brushless motor 36 that drives the electric oil pump 34 is large, and the rotational speed cannot be controlled by the counter electromotive force without increasing the rotational speed. Alternatively, the engine becomes unstable and the output is constant, so that the rotational speed is lowered to secure the torque. Moreover, even if the oil temperature is low when the electric oil pump 34 is started, if the oil temperature becomes high after that, it is necessary to increase the oil discharge amount in accordance with the increase in the leakage amount accompanying the decrease in viscosity. Therefore, the control device according to the present invention is configured so that the control content or control mode of the sensorless brushless motor 36 differs between the low temperature state and the non-low temperature state.

  FIG. 1 is a flowchart for explaining an example of the control. First, it is determined whether or not the temperature is low (step S1). Specifically, it is determined whether or not the oil temperature To of the hydraulic control device 32 is lower than a predetermined threshold value Tor1. This threshold value Tor1 is a threshold value for determining whether or not to execute control at the extremely low temperature for the sensorless brushless motor 36, and for example, a value of about −20 ° C. to −30 ° C. is adopted. . In step S1, the ambient temperature such as the atmospheric temperature or other appropriate temperature may be determined instead of the oil temperature.

  If the determination in step S1 is affirmative, an extremely low oil temperature control is executed (step S2). When the oil temperature is lower than the threshold value Tor1, the oil viscosity is high, and the rotation speed of the sensorless brushless motor 36 that drives the electric oil pump 34 is unlikely to increase. That is, in consideration of on-vehicle performance and the like, it is preferable to suppress the capacity and physique of the electric oil pump 34 as much as possible. For this reason, the capacity of the sensorless brushless motor 36 is also relatively small. The output torque of the sensorless brushless motor 36 may not always have a sufficient margin for the viscosity of the oil. Therefore, the rotation speed control for outputting the rotation speed command signal to the sensorless brushless motor 36 is executed as the extremely low oil temperature control. The commanded rotational speed is a rotational speed at which a torque capable of generating a predetermined oil pressure can be obtained by discharging oil even when the viscosity of the oil at a very low oil temperature is high. I can leave.

  Accordingly, the sensorless brushless motor 36 is rotated by being supplied with a signal having a frequency (or duty ratio) corresponding to the above-described rotation speed, and in this case, the output torque is somewhat reduced because the commanded rotation speed is relatively low. The electric oil pump 34 rotates at a high temperature. As a result, even if the viscosity of the oil is high due to the extremely low oil temperature, a predetermined oil pressure is generated, and the second brake B2 can be engaged by the oil pressure. This torque can be transmitted to the output shaft 8 to ensure starting or running using the second motor / generator 7. In this case, the sensorless brushless motor type oil pump control or the rotational speed of the electric oil pump 34 may be lower than the command value.

  Next, it is determined whether or not it is a non-low temperature state (step S3). Specifically, the oil temperature To is higher than the second threshold Tor2 (> Tor1) in order to determine whether or not the oil temperature To has risen to a temperature at which the extremely low oil temperature control is canceled. It is determined whether or not. As an example, the second threshold value Tor2 is a value of about −10 ° C.

  If a negative determination is made in step S3, it is determined whether or not the engine 1 has been started (step S4). That is, an accelerator pedal (not shown) is depressed after starting using the second motor / generator 7 or while traveling using the second motor / generator 7. When the required drive amount increases or the charge amount of a power storage device such as a battery decreases, the engine 1 may be started in order to increase the drive torque or to generate power by the first motor / generator 6. is there. In step S4, it is determined whether or not the engine 1 has been started.

  If a negative determination is made in step S4, the routine is temporarily exited. On the other hand, when a positive determination is made in step S4, stop control of the electric oil pump 34 is executed (step S5). This is because when the engine 1 is started, a necessary and sufficient hydraulic pressure can be generated by the mechanical oil pump 33, and the discharge amount is sufficient.

  On the other hand, when a negative determination is made in step S1, that is, when it is determined that the oil temperature To is equal to or higher than the first threshold value Tor1, control in a non-low temperature state is executed (step S6). Specifically, the control in the non-low temperature state is to control the sensorless brushless motor 36 in the same manner as in a normal state, supplying a constant voltage to the sensorless brushless motor 36, and based on the back electromotive force. Control the current.

  The non-low temperature state is a state in which the oil viscosity To is relatively small due to the oil temperature To being high to some extent, so that the rotational speeds of the electric oil pump 34 and the sensorless brushless motor 36 are somewhat high, Since the viscosity of the oil is relatively low, the rotation speed is stabilized by the control based on the counter electromotive force in the sensorless brushless motor 36, and the discharge amount of the pressure oil from the electric oil pump 34 becomes a necessary and sufficient amount. is there. Note that the control in step S6 is also executed when the oil temperature To has become equal to or higher than the second threshold value Tor2 and a positive determination is made in step S3 described above. Then, after the control in the non-low temperature state in step S6, that is, the normal control is executed, the process proceeds to step S4 described above, and it is determined whether or not the engine 1 is determined to be started.

  Note that when the electric oil pump 34 is started by controlling the rotation speed of the sensorless brushless motor 36 in the extremely low oil temperature state, the oil temperature gradually increases with the passage of time, and thus the elapsed time after the electric oil pump 34 is started. It is good also as shifting to control of normal time. That is, step S3 described above may be replaced with a step of comparing the oil temperature To with the second threshold value Tor2, and a step of determining the passage of time.

  Therefore, according to the control device of the present invention configured to execute the control shown in FIG. 1 described above, the sensorless brushless motor 36, which is the power source of the electric oil pump 34, has a predetermined frequency or duty ratio at an extremely low temperature. Since the rotational speed is controlled by the energization signal (driving voltage), even if the viscosity of the oil is high, it is possible to overcome the resistance force and rotate the electric oil pump 34 to generate a predetermined oil pressure. Further, when the oil temperature rises and the viscosity thereof decreases, the rotational speed control is canceled and the control based on the back electromotive force with a constant voltage is performed, and the rotational speeds of the sensorless brushless motor 36 and the electric oil pump 34 are increased. Therefore, a predetermined oil pressure can be ensured even when the viscosity of the oil decreases and the leakage of the pressure oil increases. Therefore, the necessary and sufficient hydraulic pressure is supplied to the transmission 19 to ensure the torque of the second motor / generator 7 to the output shaft 8 in both the extremely low temperature and the so-called non-low temperature state where the oil temperature has increased. It is possible to ensure traveling. Alternatively, the reaction torque acting on the output shaft 8 when the engine 1 is started by the first motor / generator 6 can be canceled or reduced by the output torque of the second motor / generator 7.

  Here, the relationship between the above specific example and the present invention will be briefly described. The functional means in step S1 or step S3 described above corresponds to the temperature determining means in the present invention, and the functional means in step S2 is 2 corresponds to the rotational speed command means of the present invention, the functional means of step S6 corresponds to the constant voltage control means of the present invention, and the transmission 19 or the brakes B1 and B2 shown in FIG. Corresponds to the transmission mechanism.

  Note that the present invention is not limited to the above specific example, and the electric oil pump that uses a sensorless brushless motor as a power source satisfies a predetermined condition such as when the vehicle is temporarily stopped, in addition to the above hybrid drive device. Thus, the present invention can be applied to a control device for an electric oil pump in a vehicle that performs so-called eco-run control for stopping a power source (for example, an engine).

It is a flowchart for demonstrating the example of control by the control apparatus of this invention. It is a schematic diagram which shows an example of the hybrid drive device which can apply the control apparatus of this invention. It is a figure which shows typically the state of the parallel connection of a mechanical oil pump and an electric oil pump. It is a figure which shows typically the control system of a sensorless brushless motor.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Output shaft, 6 ... 1st motor generator, 7 ... 2nd motor generator, 8 ... Output shaft, 9 ... Power distribution device, 19 ... Transmission, 32 ... Hydraulic control device, 34 ... electric oil pump, 36 ... sensorless brushless motor, 37 ... controller, B1, B2 ... brake.

Claims (3)

In the control device of the sensorless brushless motor type oil pump that drives the oil pump by the sensorless brushless motor controlled based on the back electromotive force,
Temperature determining means for determining the temperature ;
A rotation number command means for outputting a signal for rotating the pre-Symbol sensorless brushless motor at a predetermined rotational speed,
Constant voltage control means for performing constant voltage control for supplying a constant voltage to the sensorless brushless motor instead of the signal output by the rotation speed command means;
With
When the low temperature state is determined by the temperature determination means, the sensorless brushless motor is controlled to rotate at the predetermined rotation speed by a signal output from the rotation speed command means, and the rotation speed command means outputs After starting the sensorless brushless motor by a signal, when it is determined that the temperature determining means is in a non-low temperature state, or when a predetermined time has elapsed from the time of starting by the signal output by the rotational speed command means The sensorless brushless motor type oil pump control device is configured to switch the sensorless brushless motor to the constant voltage control by the constant voltage control means . Before Symbol oil pump control apparatus of a sensor-less brushless motor oil pump according to claim 1, characterized in that it is configured to supply the hydraulic pressure to the transmission mechanism for transmitting the torque engages hydraulically. Before Symbol transmission mechanism comprises the transmission of mechanical distribution type hybrid drive system for transmitting the torque of the electric motor via a transmission to the output member while distributing the output torque of the internal combustion engine and the output member and the power generation mechanism,
The temperature determination means includes means for determining an oil temperature at the start of the hybrid drive device;
The rotation speed command means includes a start time command means for outputting a rotation speed command signal to the sensorless brushless motor when the oil temperature at the start of the hybrid drive device is equal to or lower than a predetermined temperature.
The control device for a sensorless brushless motor type oil pump according to claim 2 .

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