JP5407905B2 - Hydraulic supply device - Google Patents

Description

  The present invention relates to a hydraulic pressure supply apparatus in, for example, an automobile.

  Conventionally, as a hydraulic pressure supply apparatus in an automobile, an apparatus having only a main pump driven by an engine as a main power source has been used.

  However, when an idle stop function is provided that stops the engine when the vehicle is stopped, the conventional main pump and battery are connected to ensure the supply of hydraulic pressure to the drive system such as the transmission even when the engine is stopped due to the idle stop. Two hydraulic sources are required, with an auxiliary pump driven by an electric motor as a power source.

  As a hydraulic pressure supply device for an automobile provided with such two hydraulic pressure sources, the one shown in Patent Document 1 is known.

  FIG. 3 shows the main part when this hydraulic pressure supply device is applied to the hydraulic pressure supply to the transmission.

  In FIG. 3, the hydraulic pressure supply device includes a main pump (2) driven by an engine (1) and an auxiliary pump (4) driven by an electric motor (3). The suction port (5) of the main pump (2) is connected to the oil pan (6), and the discharge port (7) is connected to the transmission (9) via the main discharge oil passage (8). The suction port (10) of the auxiliary pump (4) is connected to the oil pan (6), and the discharge port (11) is connected to the main discharge oil passage (8) via the auxiliary discharge oil passage (12). The auxiliary discharge oil passage (12) is provided with a check valve (13) that prevents backflow of oil from the transmission (9) side to the auxiliary pump (4) side. The electric motor (3) is controlled by the auxiliary pump control device (14).

  The control device (14) stops driving the auxiliary pump (4) when the engine (1) is being driven. At this time, because the engine (1) is driven, the main pump (2) is driven to rotate forward, and oil is supplied from the main pump (2) to the transmission (9) through the main discharge oil passage (8). Is done. The check valve (13) prevents the backflow of oil from the main discharge oil passage (8) to the auxiliary pump (4). The control device (14) drives the auxiliary pump (4) to rotate forward when the engine (1) is stopped. At this time, the main pump (2) is stopped, and when the auxiliary pump (4) is driven to rotate forward, the auxiliary discharge oil passage (12) and the main discharge oil passage (8) are moved from the auxiliary pump (4). Oil is supplied to the transmission (9) via

JP-A-11-287316

  In the hydraulic pressure supply device described above, when the engine (1) is driven and the auxiliary pump (4) is stopped driving, an abnormality occurs in the check valve (13) and oil backflow can be prevented. When it runs out, the oil flows backward from the auxiliary discharge oil passage (12) through the discharge port (11) to the auxiliary pump (4). The oil flowing back to the discharge side of the auxiliary pump (4) rotates the rotor of the auxiliary pump (4) in the reverse direction and enters the suction side. However, because of the resistance of the rotor, both the discharge side and the suction side become high pressure.

  In the hydraulic pump used for the auxiliary pump (4), the discharge side has a high pressure during normal operation, but the suction side has a low pressure. Therefore, the suction side seal is generally not designed to withstand the high pressure. For this reason, when the suction side becomes a high pressure as described above, there is a problem that the seal cannot function and oil leakage occurs. Even if the suction side seal is designed to withstand high pressure, the pump housing of the auxiliary pump (4) becomes very high pressure due to the backflow of oil. There is a problem that it must be made larger than necessary.

  In the case of a hydraulic pressure supply device provided with a main pump and an auxiliary pump in addition to the hydraulic pressure supply device for automobiles, there is a similar problem.

  An object of the present invention is to provide a hydraulic pressure supply device that solves the above-described problems and can reduce damage caused by backflow of oil to an auxiliary pump as much as possible.

  The hydraulic pressure supply apparatus according to the present invention includes a main pump driven by a main power source and having a discharge port connected to an oil-using device via a main discharge oil passage, and a discharge port driven by an electric motor via an auxiliary discharge oil passage. An auxiliary pump connected to the main discharge oil passage and an auxiliary pump control device that controls the auxiliary pump by controlling the electric motor are provided. The auxiliary discharge oil passage is provided with oil from the oil-using equipment side to the auxiliary pump side. A check valve is provided to prevent backflow, and the auxiliary pump controller stops driving the auxiliary pump when the main power source is driven, and turns off the auxiliary pump when the main power source is stopped. Rotation detecting means for detecting the rotational state of the auxiliary pump in the hydraulic pressure supply device that is driven to rotate forward and supplies oil from the auxiliary pump to the main discharge oil passage through the auxiliary discharge oil passage The main drive In the state where the source is being driven, when the auxiliary pump is detected that has been rotated reversely, it is characterized in that the auxiliary pump is adapted to forward rotation drive.

  Preferably, when the auxiliary pump control device detects that the auxiliary pump is reversely rotated in a state where the main power source is being driven, the auxiliary pump is driven forward and then stopped to assist The counter flow control that detects the rotation state of the pump is performed less than the preset maximum number of times until the auxiliary pump can no longer rotate in reverse. When it is detected that an error has occurred, an abnormal warning is issued.

  Some check valve abnormalities make it impossible to prevent backflow due to foreign object bites. In such a case, if it is detected that the auxiliary pump is rotating in the reverse direction, if the auxiliary pump is driven forward, the oil flows from the auxiliary pump through the check valve in the normal direction. The check valve may return to a normal state that prevents backflow.

  Even if the check valve does not return to a normal state, by issuing an abnormal warning as described above, it is possible to prevent oil leaks and damage to the pump housing due to backflow, and to seal the suction side more than necessary. Therefore, it is not necessary to use a high pressure pump or to make the pump housing larger than necessary.

  According to the hydraulic pressure supply device of the present invention, as described above, damage caused by oil flowing back through the check valve and back into the auxiliary pump can be reduced as much as possible, and the suction side seal of the auxiliary pump is more than necessary. Therefore, it is not necessary to use a high pressure pump or to make the pump housing larger than necessary.

FIG. 1 is a schematic configuration diagram of a hydraulic pressure supply device for an automobile showing an embodiment of the present invention. FIG. 2 is a flowchart showing an example of control of the auxiliary pump. FIG. 3 is a schematic configuration diagram of a conventional hydraulic pressure supply apparatus for an automobile.

(1) Engine
(2) Main pump
(3) Electric motor
(4) Auxiliary pump
(7) (11) Discharge port
(8) Main discharge oil passage
(9) Transmission (equipment using oil)
(12) Auxiliary discharge oil passage
(13) Check valve
(15) Auxiliary pump controller
(18) Engine state detection means
(19) Rotation detection means

  Hereinafter, an embodiment in which the present invention is applied to an automobile hydraulic pressure supply device will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a schematic configuration diagram of a hydraulic pressure supply device showing an embodiment of the present invention, and the same reference numerals are given to the same parts as those in the conventional example of FIG.

  In FIG. 1, an engine (1) constitutes a main power source, an oil pan (6) constitutes an oil reservoir, and a transmission (9) constitutes an oil using device.

  The auxiliary pump (4) and the electric motor (3) for driving the auxiliary pump (4) constitute an electric pump unit. The motor shaft (3a) of the electric motor (3) is connected to the rotor (4a) of the auxiliary pump (4), and when the electric motor (3) is driven and the motor shaft (3a) rotates, the auxiliary pump (4 ) Is driven.

  The auxiliary pump (4) is, for example, an internal gear pump. The internal gear pump is configured such that an outer rotor (outer gear) is accommodated on the outer peripheral side of a pump chamber in a pump housing, and an inner rotor (inner gear) is accommodated inside the outer rotor. In this case, the motor shaft (3a) is connected to the inner rotor.

  Connected to the auxiliary pump control device (15) are a battery (16) as a power source and an ECU (17) as a computer for controlling the engine (1) and the transmission (9). The control device (15) is provided with engine state detection means (18) and rotation detection means (19).

  The ECU (17) transmits the drive state of the engine (1) to the control device (15). The engine state detection means (18) detects the driving state of the engine (1), that is, whether the engine (1) is driven or stopped, based on a signal sent from the ECU (17).

  The rotation detecting means (19) detects the rotation state of the auxiliary pump (4), that is, the rotation speed and the rotation direction of the rotor (4a) when the drive of the auxiliary pump (4) is stopped. When the drive of the electric motor (3) is stopped and the drive of the auxiliary pump (4) is stopped, if the auxiliary pump (4) rotates for some reason, the motor shaft (3a) also rotates. The counter electromotive force is generated in the stator core constituting the electric motor (3). By detecting this counter electromotive force, the rotational speed and direction of the rotor (4a) of the motor shaft (3a), that is, the auxiliary pump (4) can be detected. The rotation detection means (19) is not limited to this, and an appropriate configuration can be adopted. For example, the rotation of the rotor (4a) or the motor shaft (3a) of the auxiliary pump (4) may be directly detected. Further, when a means for detecting the rotation speed and direction of the rotor (4a) is originally provided for controlling the auxiliary pump (4), it can be used as the rotation detection means (19). In this specification, the rotation of the auxiliary pump means the rotation of the rotor (4a).

  In the above hydraulic pressure supply device, when the engine (1) is stopped, the control device (15) drives the electric motor (3) in the forward rotation direction, thereby rotating the auxiliary pump (4) in the forward direction. To drive. At this time, the main pump (2) is stopped, and when the auxiliary pump (4) is driven to rotate forward, the auxiliary discharge oil passage (12) and the main discharge oil passage (8) are moved from the auxiliary pump (4). Oil is supplied to the transmission (9) via

  When the engine (1) is being driven, the control device (15) stops driving the electric motor (3), thereby stopping the driving of the auxiliary pump (4). At this time, because the engine (1) is driven, the main pump (2) is driven to rotate forward, and oil is supplied from the main pump (2) to the transmission (9) through the main discharge oil passage (8). Is done. The check valve (13) prevents the backflow of oil from the main discharge oil passage (8) to the auxiliary pump (4).

  The control device (15) monitors the rotational state of the auxiliary pump (4) in a state where the engine (1) is driven, that is, in a state where the drive of the auxiliary pump (4) is stopped. When it is detected that 4) is rotated in the reverse direction, the electric motor (3) is driven in the forward rotation direction, thereby performing the reverse flow control for driving the auxiliary pump (4) in the forward rotation direction.

  Next, the control of the auxiliary pump (4) in the control device (15) will be described in detail with reference to the flowchart of FIG.

  In FIG. 2, first, it is determined whether or not the engine (1) is driven (S1). If not driven, the auxiliary pump (4) is driven to rotate forward (S2), and the process is terminated.

  When the engine (1) is being driven, the drive of the auxiliary pump (4) is stopped by stopping the drive of the electric motor (3) (S3). Then, it is determined whether or not the auxiliary pump (4) is reversely rotated at a rotation speed equal to or higher than a predetermined value (S4). If the auxiliary pump (4) is not reversely rotated, it is determined that it is normal and the process is terminated.

  In S4, if the auxiliary pump (4) is rotated in the reverse direction, it is determined that an abnormality has occurred, and the electric pump (4) is driven in the normal direction for a predetermined time by driving the electric motor (3). After the rotational drive, the drive is stopped (S5). After the drive of the auxiliary pump (4) stops, it is judged whether the auxiliary pump (4) is rotated backward at a rotation speed of a predetermined value or more (S6). It is determined that the process has returned to, and the process ends. In S6, if the auxiliary pump (4) is rotated in the reverse direction, it is determined that the abnormality continues, and it is determined whether or not the reverse flow response control in S5 and S6 has been completed for the maximum number of times. If not, return to S5 and repeat S5 to S7. In S7, when the predetermined number of times of processing is completed, it is determined that the normal state has not been restored, an abnormality warning is given (S8), and the processing is terminated.

  The maximum number of times set in S7 may be one time or multiple times.

  When the engine (1) is driven and the auxiliary pump (4) is stopped, if the engine is normal, the check valve (13) prevents oil backflow to the auxiliary pump (4). The However, if an abnormality occurs in the check valve (13) and the oil backflow cannot be prevented, the oil flows back from the auxiliary discharge oil passage (12) through the discharge port (11) to the auxiliary pump (4). The oil that has flowed back to the discharge side of the auxiliary pump (4) rotates the rotor (4a) in the reverse direction and enters the suction side.

  If the check valve (13) has an abnormality that prevents backflow due to foreign object biting, the auxiliary pump (4) can be turned on when it is detected that the auxiliary pump (4) is rotating in reverse. When rotating, oil flows from the auxiliary pump (4) through the check valve (13) in the normal direction, so that foreign matter is removed and the check valve (13) returns to a normal state that prevents backflow. There is.

  Even if the check flow control of the auxiliary pump (4) is performed one or more times, even if the check valve (13) does not return to a normal state, the auxiliary pump ( 4) Oil leakage and pump housing damage due to high pressure on the suction side can be prevented in advance, and the suction side seal can be made higher than necessary, or the pump housing can be used more than necessary. There is no need to increase the size.

  The configuration of the hydraulic pressure supply device is not limited to that of the above embodiment, and can be changed as appropriate.

  The present invention can also be applied to hydraulic supply devices other than those for automobiles.

Claims (2)

The main pump driven by the main power source and the discharge port connected to the oil-using equipment via the main discharge oil passage, and the discharge port driven by the electric motor connected to the main discharge oil passage via the auxiliary discharge oil passage An auxiliary pump and an auxiliary pump control device that controls the auxiliary pump by controlling the electric motor, and a check valve that prevents backflow of oil from the oil-using device side to the auxiliary pump side is provided in the auxiliary discharge oil passage. An auxiliary pump control device is provided that stops driving the auxiliary pump when the main power source is driven, and drives the auxiliary pump to rotate forward when the main power source is stopped. In the hydraulic pressure supply device that supplies oil from the auxiliary discharge oil passage to the main discharge oil passage,
The auxiliary pump control device includes rotation detecting means for detecting the rotation state of the auxiliary pump. When the auxiliary pump control device detects that the auxiliary pump is rotated in the reverse direction when the main power source is driven, the auxiliary pump is A hydraulic pressure supply device configured to be driven to rotate forward.   When the auxiliary pump control device detects that the auxiliary pump is rotated in the reverse direction while the main power source is being driven, the auxiliary pump is rotated forward after the auxiliary pump is driven to rotate. The counterflow control for detecting the state is performed a number of times less than or equal to the preset maximum number of times until the auxiliary pump can no longer be rotated in the reverse direction. 2. The hydraulic pressure supply device according to claim 1, wherein an abnormality warning is issued when it is detected.

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