JP2019044671A - Pump device - Google Patents

Abstract

[Problem] A control device is configured that can discharge fluid from a pump at a target discharge pressure regardless of the fluid temperature. [Solution] The control unit (C) extracts map data corresponding to the rotation speed of a drive source from a map data storage unit (33) and sets it in a map data reference unit (34), converts the target fluid pressure into a converted fluid pressure in a pressure value conversion unit (31), and obtains a target current value by referencing the map data in the map data reference unit (34) using this converted fluid pressure, and outputs the target current value to an electromagnetic valve (V). [Selected Figure] Figure 4

Description

  The present invention relates to a pump device.

  Patent Document 1 includes a linear solenoid valve that controls hydraulic oil supplied to a friction element for performing a shift control process of an automatic transmission, and supplies hydraulic oil that becomes a hydraulic pressure of an output hydraulic pressure target value from the linear solenoid valve. In this case, a technique for calculating a command current based on a command current versus command hydraulic pressure map created for each individual linear solenoid valve is described.

  In this patent document 1, the difference between the actual output hydraulic pressure and the command hydraulic pressure is calculated by sweeping the command current, and the command current vs. command hydraulic pressure map is created by correcting the reference map prepared in advance based on this difference. Therefore, since automatic shift is performed based on the created command current vs. command hydraulic pressure map, individual differences of the electromagnetic hydraulic control means are reduced to improve control accuracy.

  In Patent Document 2, a parameter related to a hydraulic characteristic of a solenoid valve used in an automatic transmission is stored in a memory, a parameter stored in the memory is called, and a target current for a target hydraulic pressure is calculated based on the parameter. The technology is described.

  In Patent Document 2, as an automatic transmission system, optimum virtual map identification information and a parameter stored in a memory are called to select an optimum virtual map, and the optimum virtual map is selected as a target solenoid valve based on the selection and the parameter. Calculate the target current to be supplied.

  Patent Document 3 includes an inner rotor having external teeth, an outer rotor having internal teeth, and an adjustment ring that adjusts the discharge amount of hydraulic oil by adjusting the position of the inner rotor, and pressure acting on the adjustment ring from the discharge port. The technology of an oil pump that includes an electromagnetic valve to be controlled and that operates an adjustment ring by controlling the electromagnetic valve to control the discharge amount of hydraulic oil is described.

  In Patent Document 3, a coil spring that biases the adjustment ring in a direction to increase the discharge pressure of the discharge port is provided, and the pressure acting on the adjustment ring is increased by controlling the electromagnetic valve to resist the biasing force of the coil spring. Thus, the operation mode is set so that the adjustment ring is operated to reduce the discharge pressure at the discharge port.

JP 2011-256987 A JP 2005-155920 A Japanese Patent Laid-Open No. 2006-98768

  In the techniques described in Patent Documents 1 and 2, the current value supplied to the electromagnetic solenoid is obtained based on the map, and appropriate control is realized by the obtained current value. However, in the case of using engine lubricating oil as hydraulic oil in a vehicle, the viscosity of the lubricating oil increases at a low temperature. Therefore, it is necessary to consider the temperature when setting the current value supplied to the electromagnetic solenoid. However, the techniques disclosed in Patent Documents 1 and 2 do not take temperature into consideration and have room for improvement.

  Here, as described in Patent Document 3, when a pump capable of changing the discharge pressure is considered, even with a pump having such a configuration, the influence of the temperature of hydraulic oil is large. It is difficult to obtain a target discharge pressure even if a map is set by technology and the current value supplied to the electromagnetic valve is obtained based on this map and controlled.

  In order to eliminate such inconvenience, it is also conceivable to set table data in consideration of temperature. However, considering the control of the variable displacement pump described in Patent Document 3, based on the rotational speed of the pump drive shaft (the number of rotations per unit time), the set pump capacity, and the oil temperature. The data structure for obtaining the current supplied to the solenoid valve is not only required for the table data, but also requires a large amount of non-volatile memory and sets this data. The process is complicated and not realistic.

  For these reasons, there is a need for a control device that can deliver fluid from a pump at a target discharge pressure regardless of the temperature of the fluid.

A feature of the present invention is that an inner rotor having a plurality of external teeth and rotatable about a first axis, and a plurality of internal teeth engaging with a part of the plurality of external teeth of the inner rotor have a second axis. An outer rotor rotatable around a core, a housing for accommodating these, and a suction port and a discharge port formed in the housing,
An adjusting member that rotatably supports the outer rotor and that adjusts a fluid discharge pressure at the discharge port by changing a positional relationship between the first shaft core and the second shaft core;
An urging mechanism for urging the adjusting member in an increasing or decreasing direction of the discharge pressure, and a pressure of fluid from the discharge port are applied to the adjusting member against the urging force of the urging mechanism. A variable capacity pump unit comprising a control flow path for applying pressure and an electromagnetic valve interposed in the control flow path for adjusting a fluid pressure acting on the adjustment member;
A rotation speed sensor that detects a rotation speed per unit time of a drive source that drives the inner rotor or the outer rotor, and a control unit that controls the electromagnetic valve,
The control unit includes a map data storage unit capable of extracting a plurality of stored map data corresponding to the rotational speed of the drive source, and a conversion target fluid that provides target fluid pressure as one-dimensional position information in a definition region. A pressure value conversion unit that converts pressure, a map data reference unit that acquires the target current value by referring to the map data with the converted target fluid pressure, and an output current that outputs the acquired target current value to the electromagnetic valve And a control unit,
The map data has a data structure represented by an orthogonal coordinate system in which the definition area is taken in the direction of a target axis and the target current value is taken in the direction of an output axis perpendicular to the target axis,
The pressure value conversion unit includes a first inflection value of the definition region in the map data based on a rotation speed of the driving source detected by the rotation speed sensor and a temperature of the fluid detected by a temperature sensor. And the second inflection value are set.

According to this characteristic configuration, in the control unit, when the map data corresponding to the rotational speed of the drive source is extracted from the map data storage unit and the target fluid pressure is acquired, the target fluid pressure is converted into the conversion target by the pressure value conversion unit. Convert to fluid pressure. Next, the map data reference unit acquires the target current value by referring to the map data with the converted target fluid pressure, and the output current control unit outputs the current corresponding to the acquired target current value to the electromagnetic valve. .
In other words, even if the target fluid pressure is a predetermined value, the current value to be supplied to the electromagnetic valve differs according to the rotational speed of the drive source. For this reason, it is possible to set an appropriate target current value to be supplied to the electromagnetic valve in order to obtain a target fluid pressure corresponding to the rotational speed by selecting map data corresponding to the rotational speed of the drive source.

For example, considering that a target current value is obtained by referring to map data with a target fluid pressure expressed in units such as MPa (megapascal), the target fluid pressure and target corresponding to units such as MPa as map data A data structure that reflects the current value is required. However, in such a data structure, when the rotational speed of the drive source or the temperature of the fluid changes, the map data is corrected or corrected to cope with this change, or the corresponding map data is newly set. In order to make new map data, it is necessary to prepare a large number of map data in advance.
On the other hand, based on the rotational speed of the drive source detected by the rotational speed sensor and the temperature of the fluid detected by the temperature sensor, the second inflection value and the first inflection value in the definition area in the map data If the target fluid pressure is converted to the converted target fluid pressure that is one-dimensional position information in the definition area, the map data that has already been set can be referred to without changing or changing the map data. The target current value can be acquired.
Therefore, a control device has been constructed that can deliver fluid from the pump at a target discharge pressure regardless of the temperature of the fluid.

  As another configuration, the definition area may be set as a numerical value range of 0 to 1.

  According to this, the target fluid pressure can be obtained by converting the target fluid pressure into a converted target fluid pressure that is a numerical value corresponding to 0 to 1, and referring to the conversion map data with the converted target fluid pressure thus converted. Thus, calculation is easy and high-speed processing is possible.

As another configuration, among the currents supplied to the electromagnetic valve based on the temperature of the fluid detected by the temperature sensor, the current at which the displacement of the adjustment member starts due to the fluid pressure acting on the adjustment member An inflection value setting unit for setting a first inflection value and the second inflection value that is a current at which the adjustment member reaches a displacement limit and the displacement ends;
The output current control unit may supply current to the electromagnetic valve based on the first change value and the second change value.

  The variable displacement pump changes the discharge amount in a range from a change start point at which the adjustment member starts operating to a change end point at which the adjustment member reaches the operation limit. Accordingly, by outputting a current within the range of the first and second pole values set by the pole value setting unit as in this configuration, wasteful current supply is suppressed.

A feature of the present invention is that an inner rotor having a plurality of external teeth and rotatable about a first axis, and a plurality of internal teeth engaging with a part of the plurality of external teeth of the inner rotor have a second axis. An outer rotor rotatable around a core, a housing for accommodating these, and a suction port and a discharge port formed in the housing,
An adjusting member that rotatably supports the outer rotor and that adjusts a fluid discharge pressure at the discharge port by changing a positional relationship between the first shaft core and the second shaft core;
An urging mechanism for urging the adjusting member in an increasing or decreasing direction of the discharge pressure, and a pressure of fluid from the discharge port are applied to the adjusting member against the urging force of the urging mechanism. A variable capacity pump unit comprising a control flow path for applying pressure and an electromagnetic valve interposed in the control flow path for adjusting a fluid pressure acting on the adjustment member;
A rotation speed sensor that detects the rotation speed per unit time of the inner rotor or the outer rotor, a temperature sensor that detects the temperature of the fluid, and a control unit that controls the electromagnetic valve,
The control unit includes basic map data indicating a relationship between a current supplied to the electromagnetic valve at a specific fluid temperature and a fluid discharge pressure at the discharge port, and the number of rotations detected by the rotation number sensor and the temperature A data conversion unit that obtains a maximum fluid pressure and a minimum fluid pressure based on a fluid temperature detected by a sensor and generates conversion map data by converting at least the basic map data based on these values. And
The control unit obtains a target current value to be supplied to the electromagnetic valve by referring to the conversion map data with a set target fluid pressure, and drives the electromagnetic valve with a current corresponding to the target current value. In the point.

  According to this characteristic configuration, the data converter obtains the rotational speed of the drive system that drives the pump and the fluid temperature before supplying current to the electromagnetic valve, and generates conversion map data reflecting these. The appropriate output current value can be acquired based on the target hydraulic pressure. That is, since the rotation speed and the fluid temperature at the time of executing the control are reflected in the output current value, the fluid can be supplied at the discharge pressure required from the pump device only by setting the target fluid pressure. In addition, with this feature configuration, the discharge pressure of the pump unit can be set with high accuracy even in an extremely low temperature environment, and the conversion map data can be updated at set intervals, so that changes in the rotational speed of the drive system and changes in the fluid temperature can be avoided. The target current value can be acquired using the latest corresponding conversion map data.

  Since the conversion map data reflects the rotational speed of the drive system that drives the pump and the fluid temperature as described above, table data having a structure for storing data based on the rotational speed and the fluid temperature, etc. In the case of using a non-volatile memory or the like, it is only necessary to store basic map data and parameters necessary for generating conversion map data.

  In this characteristic configuration, the pump unit has a mechanical structure in which the fluid pressure at the discharge port is determined by operating the adjusting member against the biasing force of the biasing mechanism by the action of the fluid pressure. The discharge pressure (maximum or minimum pressure) when the member is in the non-operating position is determined, and the discharge pressure (minimum or maximum pressure) when the adjustment member reaches the operating limit is determined. For this reason, the data converter obtains the maximum fluid pressure and the minimum fluid pressure based on the rotation speed detected by the rotation speed sensor and the fluid temperature detected by the temperature sensor. Since the transformation map data is generated by similar transformation of the basic map data, it is possible to eliminate the setting of the target fluid pressure higher than the maximum fluid pressure and the target fluid pressure lower than the minimum fluid pressure in the transformation map data It becomes.

Furthermore, for example, the conversion map data includes a predetermined line (in a rectangular coordinate system having a current value on the horizontal axis and a numerical value (indicated as a variable ratio in FIG. 11) necessary for conversion on the vertical axis (see FIG. 11). It can be taken as a curve). In such conversion map data, the target current can be easily determined from the horizontal axis by setting the target fluid pressure on the vertical axis and referring to the conversion map data. Compared to a large amount of data stored in a non-volatile memory, the resolution can be increased and the output current can be set with high accuracy.
Therefore, a pump device has been constructed that can deliver fluid from the pump at a target discharge pressure regardless of the temperature of the fluid.

In another configuration, the conversion map data takes an electric current value in one axial direction, and the adjustment member operates in accordance with an increase in the electric current value in an orthogonal coordinate system in which the discharge pressure is taken in an axial direction perpendicular thereto. It has a data structure with a conversion line of an inclined posture that connects a change start point to start and a change end point at which the adjustment member reaches the operating limit,
The control unit may include a change point setting unit that sets the change start point and the change end point based on a detection result of the rotation speed sensor and a detection result of the temperature sensor.

  The variable displacement pump changes the discharge amount in a range from a change start point at which the adjustment member starts operating to a change end point at which the adjustment member reaches the operation limit. Therefore, by obtaining the target current based on the conversion line, it is possible to control the discharge pressure with high accuracy within a range in which the discharge pressure can be adjusted.

  As another configuration, the conversion map data may be configured as a data structure in which the discharge pressure ranges from 0 to 1 so that the value of the maximum discharge pressure in the axial direction indicating the discharge pressure is 1.

  According to this, the target fluid pressure is converted into a value corresponding to 0 to 1, and the target current can be obtained by referring to the conversion map data with the converted target fluid pressure, so that calculation is easy and high-speed processing is possible. Enable.

It is a hydraulic circuit diagram which shows the structure of a pump control apparatus. It is sectional drawing of the pump part by which discharge pressure was set to the maximum. It is sectional drawing of the pump part by which discharge pressure was set to the minimum. It is a block circuit diagram of the control unit of 1st Embodiment. It is a figure which shows the shape of the map data of 1st Embodiment. It is a figure which shows the relationship between the target hydraulic pressure of 1st Embodiment, and a conversion target hydraulic pressure. It is a flowchart of the discharge pressure control routine of 1st Embodiment. It is a block circuit diagram of the control unit of 2nd Embodiment. It is a figure which shows the basic map data of 2nd Embodiment. It is a figure which shows the similarity conversion map data of 2nd Embodiment. It is a figure which shows the conversion map data of 2nd Embodiment. It is a flowchart which shows the discharge pressure control routine of 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration]
As shown in FIG. 1, a variable displacement pump unit P driven by an engine E as a drive source, an electromagnetic valve V for controlling the discharge pressure (capacity) of the pump unit P, and detection of a rotation speed sensor SR The pump device 100 is configured to include a control unit C that controls the electromagnetic valve V based on the result and the detection result of the temperature sensor ST.

  The pump device 100 is provided in a vehicle such as a passenger car. The pump unit P is driven by an engine E of the vehicle and sucks oil (an example of a fluid) of an oil pan of the engine E through a suction flow path 1. , And supplied through the supply channel 2. The vehicle is provided with a hydraulic actuator 3 such as a valve opening / closing timing control device for setting the opening / closing timing of the intake valve of the engine E or a hydraulic transmission, and a main gallery 4 for lubricating the engine E, etc. Oil from the supply flow path 2 is supplied to the pump 100. Note that the pump device 100 may be configured to supply water, chemicals, and the like in addition to oil.

  As shown in FIG. 1, the pump device 100 supplies a part of oil (an example of a fluid) sent to the supply flow path 2 to the pressure chamber PS (see FIG. 2) of the pump unit P via the electromagnetic valve V. And a drain channel 6 for discharging the oil in the pressure chamber PS through the electromagnetic valve V.

  The control unit C functions as an ECU that controls the oil pressure, and the detection signal of the rotation speed sensor SR that acquires the rotation speed per unit time of the crankshaft of the engine E, and the oil of the oil sucked by the pump unit P A detection signal from a temperature sensor ST that detects temperature (fluid temperature) is input.

  When the control unit C acquires the target hydraulic pressure (target fluid pressure) from the outside, the control unit C acquires the target current value with reference to the map data M, and uses this target current value for the electromagnetic valve V (strictly, the electromagnetic valve By driving the V electromagnetic solenoid, a control mode for supplying oil with a target appropriate discharge pressure is performed (this control mode will be described later).

  FIG. 1 shows an electromagnetic valve V of a two-position switching type in which the spool is set at two positions. However, the electromagnetic valve V is not limited to this configuration. A relief valve that can adjust the pressure acting on the pressure chamber PS (see FIG. 2) via the control flow path 5 by controlling, an unload valve, or the like may be used. When the drive current is not supplied (not driven), the electromagnetic valve V is held at the initial position shown in FIG. Thereby, the control flow path 5 and the drain flow path 6 become a communication state, and the pressure of the pressure chamber PS is reduced to atmospheric pressure. In addition, when supplied to the electromagnetic valve V (when driven), the hydraulic pressure acting on the pressure chamber PS from the control flow path 5 is simultaneously prevented while the oil flow in the drain flow path 6 is blocked as the drive current increases. Increase.

[Pump part]
As shown in FIGS. 2 and 3, the pump portion P accommodates the inner rotor 14, the outer rotor 15, and the adjusting mechanism 20 in a housing H in which the suction port 11 and the discharge port 12 are formed.

  The inner rotor 14 has a plurality of external teeth 14A, is rotatably supported around a drive shaft core X (an example of a first shaft core), and is indicated by an arrow in the figure by a drive shaft 13 driven by the engine E. Rotate in the direction. The outer rotor 15 has a plurality of inner teeth 15A that mesh with the outer teeth of the inner rotor 14, and is rotatably supported around a driven shaft core Y (an example of a second shaft core) that is eccentric with respect to the drive shaft core X. ing.

  The pump portion P is also referred to as an internal gear type, and the outer teeth 14A of the inner rotor 14 are formed in a tooth surface shape according to a mathematical curve. One more than the number of external teeth 14A is set.

  The adjustment mechanism 20 includes an adjustment ring 21 (an example of an adjustment member) that rotatably accommodates the outer rotor 15, an arm portion 22 that is integrally formed with the adjustment ring 21, and a compression coil type that applies a biasing force to the arm portion 22. Adjustment spring 23 (an example of an urging mechanism). In the adjusting mechanism 20, a guide pin 24 fixed to the housing H is inserted into a pair of long hole-shaped guide holes 21 </ b> A formed in the adjusting ring 21, thereby being guided by the pair of guide pins 24. In this state, the adjustment ring 21 operates.

  In addition, oil seals 25 that maintain a sealed state even when the adjustment ring 21 is operated are provided at two locations on the outer periphery of the adjustment ring 21 and at the protruding end of the arm portion 22. Thus, a low pressure chamber LS communicating with the suction port 11, a high pressure chamber HS communicating with the discharge port 12, and a pressure chamber PS are formed in the inner space of the housing H on the outer peripheral side of the adjustment ring 21. In particular, a control hole 16 communicating with the control flow path 5 is formed in the wall surface of the housing H constituting the pressure chamber PS.

  In the adjusting mechanism 20, the outer rotor 15 moves in such a manner that the driven shaft Y is revolved around the drive shaft X by operating the adjusting ring 21 while being guided by the pair of guide pins 24. By this movement, the occlusal relationship in the pressurizing region between the outer teeth 14A of the inner rotor 14 and the inner teeth 15A of the outer rotor 15 is changed, and the adjustment of the oil discharge pressure is realized. As a result, the discharge amount of oil is also adjusted by adjusting the discharge pressure.

  Further, when the adjustment ring 21 (arm portion 22) is in the posture shown in FIG. 2, the change in the engagement depth between the outer teeth 14A of the inner rotor 14 and the inner teeth 15A of the outer rotor 15 in the discharge port 12 is large. Therefore, the oil discharge pressure becomes maximum (the pump capacity is maximum). Further, when the adjustment ring 21 (arm portion 22) is in the posture shown in FIG. 3, the change in the engagement depth between the outer teeth 14A of the inner rotor 14 and the inner teeth 15A of the outer rotor 15 in the discharge port 12 is small. Oil discharge pressure is minimized (pump capacity is minimized).

  Further, the biasing force of the adjustment spring 23 acts in the direction of increasing the oil discharge pressure from the pump part P. As a result, by controlling the pressure in the pressure chamber PS, the adjustment ring 21 is operated against the urging force of the adjustment spring 23, and oil can be supplied in a state where the discharge pressure is set to an arbitrary value.

  In this pump part P, the inner rotor 14 is driven and rotated by the drive shaft 13 driven by the engine E. However, the outer rotor 15 may be driven and rotated by the driving force of the engine E.

[Pump: Capacity control]
When the driving current is not supplied to the electromagnetic valve V in the situation where the engine E is operating, the oil in the pressure chamber PS is discharged through the drain flow path 6, so that the pressure chamber PS becomes equal to the atmospheric pressure. Thereby, the adjustment ring 21 is maintained in the posture shown in FIG. 2 by the urging force of the adjustment spring 23, and the oil discharge pressure at the discharge port 12 becomes maximum (the flow rate is also maximum).

  Accordingly, in a situation where the rotational speed of the engine E is low and the amount of oil is reduced, such as when the engine E is started, the control unit C does not perform control for supplying a drive current to the electromagnetic valve V. The main gallery 4 is supplied with the required amount of oil.

  Further, when adjustment of the discharge pressure (discharge amount) from the pump part P is necessary for the supply flow path 2, the control unit C is controlled from the electromagnetic valve V by adjusting the drive current supplied to the electromagnetic valve V. The oil pressure is controlled in the pressure chamber PS via the flow path 5. Thereby, the adjustment ring 21 is operated integrally with the arm portion 22 to a position corresponding to the pressure of the oil acting on the pressure chamber PS, and the adjustment of the oil discharge pressure (discharge amount) is realized.

〔Controller unit〕
The pump device 100 is configured to control either the control unit C configured as described in the first embodiment or the control unit C configured as described in the second embodiment. These configurations and control modes will be sequentially described below.

[Control Unit of First Embodiment]
As shown in FIG. 4, the control unit C of the first embodiment includes a pressure value conversion unit 31, a region setting unit 32, a map data storage unit 33, a map data reference unit 34, and a pole value setting unit 35. And an output current control unit 36.

  In this control unit C, the pressure value conversion unit 31, the region setting unit 32, the map data reference unit 34, and the inflection value setting unit 35 are configured by software, but these are configured by hardware. It may be a combination of hardware and software.

  The map data storage unit 33 is composed of a nonvolatile memory. The output current control unit 36 has a function of suppressing the output current based on a first variable value α and a second variable value β, which will be described later, and a part thereof may be configured by software.

  As shown in FIG. 5, the map data M takes a definition region D in the range of 0 to 1 in the direction of the vertical axis (target axis), and in the direction of the horizontal axis (output axis) perpendicular to the vertical axis (target axis). It has a data structure represented by an orthogonal coordinate system that takes a target current value. The map data M is stored for each rotation speed of the engine E (drive source) at a predetermined oil temperature (for example, 90 ° C.). By converting the map data M at a ratio of 0 to 1 and storing it, the direction of the vertical axis can be referred to at the same resolution at each rotation speed as compared to the case where the hydraulic pressure is expressed in, for example, MPa (megapascal). Become.

  As shown in FIG. 5, the map data M is composed of an upper limit line portion Ma, a lower limit line portion Mb, and a conversion line portion Mc, and when referring to the target current value indicated by the map data M from the converted target hydraulic pressure. Is a reference form in which the horizontal axis is viewed from the vertical axis via the conversion line portion Mc. In addition, as shown in the figure, the boundary point between the upper limit line portion Ma and the conversion line portion Mc is the first boundary value a, and the boundary point between the conversion line portion Mc and the lower limit line portion Mb is the second boundary value b. Yes.

  When the target hydraulic pressure is acquired, the pressure value conversion unit 31 converts the target hydraulic pressure into a value included in the definition area D set by the area setting unit 32. The region setting unit 32 acquires the detection signal of the rotation speed sensor SR and the detection signal of the temperature sensor ST, and based on the rotation speed of the engine E (drive source) and the temperature of the engine E (temperature of hydraulic oil), As shown in FIG. 6, at the detected temperature of the engine E, the upper limit value Max and the lower limit value Min of the hydraulic pressure that can be discharged are set at the detected rotation speed of the engine E. The target hydraulic pressure is located between the upper limit value Max and the lower limit value Min. Further, the inflection value setting unit 35 calculates the first inflection value α and the second inflection value β based on the detection result of the temperature sensor ST. Further, the output current control unit 36 controls the command current value based on the map data M referred to by the map data reference unit 34 and the first variable value α and the second variable value β of the variable value setting unit 35.

  The inflection value setting unit 35 stores map data including a first inflection value α and a second inflection value β for each oil temperature of the engine E (drive source) (similar to the map data storage unit 33). Is composed of non-volatile memory). Thereby, the inflection value setting unit 35 can calculate the first inflection value α and the second inflection value β from the map data corresponding to the oil temperature of the engine E.

  In the region setting unit 32, a range of 0 to 1 (range in the vertical axis direction) is set in advance as the definition region D, and the target fluid pressure is determined from the detection result of the rotational speed sensor SR and the detection result of the temperature sensor ST. In the definition region D of 0 to 1, for example, the upper limit value Max expressed in MPa (megapascal) is made to correspond to “1”, and similarly, for example, the lower limit value Min expressed in MPa (megapascal) is set to Set to “0”. Further, the pressure value conversion unit 31 converts the acquired target hydraulic pressure into a converted target hydraulic pressure that is one-dimensional position information in the definition region D. That is, the definition area D is an area formed along the vertical axis direction, and the upper limit value Max is associated with the value “1” of the definition area D and the lower limit value Min is associated with the value “0”. Thus, the conversion target hydraulic pressure has a numerical value included in the range of 0 to 1 by the pressure value conversion unit 31 converting which position the target hydraulic pressure corresponds to the upper limit value Max and the lower limit value Min. Will be given. The target oil pressure converted in this way is referred to as a conversion target oil pressure.

  Thus, when the target oil pressure is constant and the rotation speed of the engine E fluctuates within a range where the map data M of the map data reference unit 34 is not updated, the upper limit value Max set by the region setting unit 32 And the lower limit value Min change, and the conversion target hydraulic pressure in the definition region D changes in conjunction with this, so that an appropriate target current value can be referred to.

Further, when the target current value acquired by referring to the map data M in the map data reference unit 34 is between 0 and the first boundary value a of the map data M, the current value is expressed by the following first arithmetic expression. Is calculated.
[First arithmetic expression]: target current value × (first inflection value α / first boundary value a)
When the target current value is between the first boundary value “a” and the second boundary value “b”, the current value is calculated by the following second arithmetic expression.
[Second arithmetic expression]: (target current value−first boundary value a) × (first variation value α−second variation value β) / (first boundary value a−second boundary value b) + first 2 inflection value β
When it is between the second boundary value b and 1, the current value is calculated by the following third arithmetic expression.
[Third arithmetic expression]: (1−target current value) × (1−second boundary value b) − (second inflection value β−second boundary value b) / (1−second boundary value b) +1
Control for driving the electromagnetic valve V with the current value thus replaced is performed.

[Control form]
An outline of the control of the discharge pressure control routine by the control unit C of the first embodiment is shown in the flowchart of FIG. That is, when the control is started, the map data M corresponding to the rotational speed (the rotational speed per unit time) detected by the rotational speed sensor SR is extracted from the map data storage section 33 and given to the map data reference section 34. . At the same time, based on the rotational speed detected by the rotational speed sensor SR and the oil temperature detected by the temperature sensor ST, the region setting unit 32 sets an upper limit value Max and a lower limit value Min that the target hydraulic pressure can take. Then, the definition area D is determined (# 101, # 102 steps).

  Further, the pole value setting unit 35 sets the first pole value α and the second pole value β based on the detection result of the temperature sensor ST and supplies the first pole value α and the second pole value β to the output current control unit 36 (step # 103). .

  In this control, based on the rotational speed of the crankshaft of the engine E detected by the rotational speed sensor SR, the map data M stored in the map data storage unit 33 that corresponds to the rotational speed is extracted. Then, processing for setting (loading) the map data reference unit 34 is performed. Further, the upper limit value Max and the lower limit value Min are set in the region setting unit 32 based on the rotation speed detected by the rotation speed sensor SR and the fluid temperature detected by the temperature sensor ST.

  Next, when the target hydraulic pressure is set, the region setting unit 32 determines the upper limit value Max and the lower limit value Min based on the rotational speed detected by the rotational speed sensor SR and the oil temperature detected by the temperature sensor ST. Based on the above, the target hydraulic pressure is converted into the converted target hydraulic pressure as shown in FIG. In this control, the target hydraulic pressure as an actual value is converted into a converted target hydraulic pressure that is a numerical value included in the range of 0 to 1 corresponding to the definition region D (steps # 104 and # 105).

  As described above, the pump unit P is configured to have the maximum discharge pressure when the current for driving the electromagnetic valve V is “0”, and to decrease the discharge pressure as the current for driving the electromagnetic valve V increases. ing. Because of such a configuration, the map data M is configured such that the target current value decreases as the conversion target hydraulic pressure increases.

  After the converted target oil pressure is converted from the target oil pressure in the pressure value conversion unit 31, the value on the horizontal axis indicated by the map data M corresponding to the converted target oil pressure given as the value in the vertical axis direction is used as the target current value. When the target current value needs to be changed in the output current control unit 36, the target current value is changed. Then, the output current control unit 36 outputs a current value corresponding to the target current value to the electromagnetic valve V (steps # 106 to # 108).

  The relationship between the discharge hydraulic pressure of the pump part P and the current value applied to the electromagnetic valve V varies depending on the oil temperature. For this reason, in the present embodiment, based on the fluid temperature detected by the temperature sensor ST, the values of the first variable value α and the second variable value β that are converted by the characteristics of the discharge hydraulic pressure and the current value are set. .

[Effects of First Embodiment]
Thus, by extracting only one corresponding to the rotational speed from the plurality of map data M stored in the map data storage unit 33 based on the rotational speed measured by the rotational speed sensor SR, the rotational speed is obtained. Corresponding control is enabled. Further, the map data is obtained by converting the target hydraulic pressure into a value corresponding to the structure of the map data M (converted target hydraulic pressure) in the pressure value conversion unit 31 based on the detection result of the rotational speed sensor SR and the detection result of the temperature sensor ST. The acquisition of the target current value is realized without performing processing such as correcting or correcting M or updating the map data M.

  In other words, when the horizontal axis value is acquired with reference to the map data M, the horizontal axis target from the converted target hydraulic pressure included in the definition region D that does not depend on the unit of the target hydraulic pressure value (for example, megapascal or the like). In order to acquire the current value, the inconvenience of increasing the number of map data M and the correction and correction of the map data M are solved.

  Further, since the map data M is converted to a range of 0 to 1 in the direction of the vertical axis (target axis), the target with high resolution is obtained in all regions from low rotation to high rotation of the engine E (drive source). Allows setting of the current value.

  In addition, the instruction current can be controlled in consideration of the fact that the relationship between the discharge hydraulic pressure of the pump and the current value is shifted due to the oil temperature, so that the current control corresponding to the temperature change is possible.

[Another embodiment of the first embodiment]
In addition to the first embodiment described above, the present invention may be configured as follows (those having the same functions as those of the first embodiment are given the same numbers and symbols as those of the embodiment).

  In this embodiment, the definition area D is described as a range of 0 to 1. However, instead of this, the definition area D may be a range set with an arbitrary numerical value.

[Control Unit of Second Embodiment]
The control unit C according to the second embodiment generates (updates) conversion map data MU (see FIG. 11) for each set interval based on the detection signal of the rotation speed sensor SR and the detection signal of the temperature sensor ST. At the same time, when the target hydraulic pressure (target fluid pressure) is acquired from the outside, the target current value is acquired by referring to the conversion map data MU with the target hydraulic pressure. In this control unit C, the electromagnetic valve V (strictly, the electromagnetic solenoid of the electromagnetic valve V) is driven with a drive current corresponding to the target current value, so that oil is supplied at a target appropriate discharge pressure ( This control mode will be described later).

〔Controller unit〕
As shown in FIG. 8, the control unit C of the second embodiment includes a sub data setting unit 41 (a part of the data conversion unit), a similarity conversion unit 42 (a part of the data conversion unit), and basic map data storage. Unit 43, change point setting unit 44 (part of the data conversion unit), semiconductor memory work area 45, variable ratio conversion unit 46, and current control unit 47. In the control unit C, a data conversion unit that converts the basic map data MS includes a sub data setting unit 41, a similarity conversion unit 42, and a change point setting unit 44.

  The sub data setting unit 41, the similarity conversion unit 42, the change point setting unit 44, and the variable ratio conversion unit 46 are configured by software. The basic map data storage unit 43 is configured as a non-volatile memory, and the current control unit 47 is configured with a control circuit that controls the drive current by PWM control. The sub data setting unit 41, the similarity conversion unit 42, the change point setting unit 44, and the variable ratio conversion unit 46 may be configured by hardware, or may be configured by a combination of hardware and software. .

  The control unit C stores basic map data MS shown as a graph having a shape shown in FIG. 9 (region indicated by a solid line) in a basic map data storage unit 43 configured as a nonvolatile memory. The sub-data setting unit 41 obtains the detection signal of the rotation speed sensor SR and the detection signal of the temperature sensor ST, thereby obtaining the maximum hydraulic pressure (an example of the maximum fluid pressure) indicated as Max in the similarity conversion map data MT of FIG. , A minimum hydraulic pressure (an example of the minimum fluid pressure) indicated as Min is set.

  The basic map data MS, the similarity conversion map data MT (see FIG. 10) described below, and the conversion map data MU (see FIG. 11) have current values (target current values) on the horizontal axis. It has a data structure that can be expressed in an orthogonal coordinate system with discharge pressure on the axis. Because of this data structure, the target current value is determined from the horizontal axis by determining the value (discharge pressure) on the vertical axis.

  As schematically shown in the block of the sub-data setting unit 41 in FIG. 8, the sub-data setting unit 41 has two types of calculation units corresponding to the maximum hydraulic pressure (Max) and the minimum hydraulic pressure (Min). ing. The two types of calculation units are configured to include a plurality of line-shaped graphs corresponding to different temperatures, with the number of rotations on the horizontal axis and the pressure on the vertical axis. Thereby, in the sub data setting part 41, the rotation speed (value based on the detection signal of the rotation speed sensor SR) of the graph corresponding to the oil temperature (value based on the detection signal of the temperature sensor ST) from the plurality of graphs indicating the maximum oil pressure. The maximum hydraulic pressure (Max) is acquired from the value of the vertical axis of the point corresponding to, and the minimum hydraulic pressure (Min) corresponding to the oil temperature is acquired from the graph indicating the minimum hydraulic pressure.

  An example of the basic map data MS shown in FIG. 9 is a discharge when the drive current for driving the electromagnetic valve V is increased in the horizontal axis direction when the inner rotor 14 rotates at 2000 rpm in a situation where the oil temperature is 90 ° C. The pressure change at the port 12 is shown as a linear graph with the vertical axis. The basic map data MS may be curved.

  The similarity conversion unit 42 performs similarity conversion on the basic map data MS based on the maximum hydraulic pressure (Max) and the minimum hydraulic pressure (Min). In order to perform similarity transformation, when the basic map data MS is linear, the similarity transformation map data MT subjected to similarity transformation is linear with different slopes.

  As described above, the pump portion P does not change the attitude of the adjustment ring 21 due to the urging force of the adjustment spring 23 in the initial state even when the drive current for driving the electromagnetic valve V increases, but until the drive current reaches point a. The pressure at the discharge port 12 slightly decreases. Thereafter, when the drive current exceeds the start point a, the adjustment ring 21 starts to be displaced and the pressure of the discharge port 12 starts to decrease. When the drive current reaches the end point b, the pressure is maintained at a constant value. As shown in FIG. 9, the end point b is in a state where the adjusting ring 21 has reached the mechanical operating limit. After reaching the end point b, the pressure of the discharge port 12 is increased even if the drive current is increased. Does not rise.

  The change point setting unit 44 pays attention to the fact that the start point a and the end point b described above shift in the horizontal axis direction corresponding to the oil temperature, and the start point a after the shift is set as the change start point m. The process of setting the later end point b as the change end point n is performed. Thus, by setting two types of change start points m and change end points n for the similarity transformation map data MT, a line shape is formed between the high-pressure side sub-region MUa and the low-pressure side sub-region MUb in the orthogonal coordinate system. The data structure has a main conversion area MUc (an example of a conversion line).

  The variable ratio conversion unit 46 performs processing for converting the target hydraulic pressure into a variable ratio in the conversion map data MU shown in FIG. That is, the conversion map data MU indicates a region in which the discharge pressure can be set in a range from the maximum hydraulic pressure (Max) to the minimum hydraulic pressure (Min) by a numerical value of 0 to 1 in the vertical axis direction.

  Therefore, the target hydraulic pressure can be converted into a numerical value in the range of 0 to 1, and the conversion map data MU can be referred to using the converted numerical value, and the numerical value on the horizontal axis corresponding to the numerical value can be acquired as the target current value. It becomes.

[Control form]
The outline of the control of the discharge pressure control routine by the control unit C is shown in the flowchart of FIG. That is, when the control is started, the rotation speed per unit time is acquired from the rotation speed sensor SR, and the oil temperature is acquired by the temperature sensor ST, so that the sub-data setting unit 41 has the maximum hydraulic pressure (Max) and the minimum hydraulic pressure. (Min) is set (step # 201). Although not shown in the flowchart, the similarity conversion map data MT shown in FIG. 10 is generated based on the maximum oil pressure (Max) and the minimum oil pressure (Min).

  Next, the change point setting unit 44 sets a change start point m and a change end point n based on the oil temperature, and the conversion map data MU shown in FIG. 11 is generated from the similarity conversion map data MT based on this setting. (Steps # 202 and # 203).

  The conversion map data MU shown in FIG. 11 is an example in which the rotation speed is the same and the oil temperature is low compared to the conditions when the basic map data MS is set. As shown in the figure, as the oil temperature is lower, the position of the start point a is shifted to the right side in the graph, and the position of the end point b is shifted to the left side in the graph. For this reason, a change start point m and a change end point n are set in the conversion map data MU.

  Further, the conversion map data MU is processed so that the position of the maximum fluid pressure (Max) becomes a position of “1.0” in the vertical axis direction without changing the gradient of the similarity conversion map data MT. Done. With this process, the target current value can be acquired by converting the target hydraulic pressure into a variable ratio and referring to the conversion map data MU.

  Next, when the target hydraulic pressure is acquired, the variable ratio conversion unit 46 converts the target hydraulic pressure into a variable ratio corresponding to the range of 0 to 1, and by referring to the conversion map data MU at this variable ratio, A target current value is acquired, and a drive current corresponding to the target current value is supplied from the current control unit 47 to the electromagnetic valve V based on the target current value (steps # 204 to # 207).

  By this control, the opening degree reflecting the rotational speed of the inner rotor 14 and the oil temperature of the oil is set in the electromagnetic valve V, and the hydraulic valve acting on the adjustment ring 21 is appropriately operated and required. Pressure oil is discharged from the discharge port 12.

  It is to be noted that the series of control is repeatedly performed until the control is reset, and every time a predetermined set interval time (for example, a short time of less than 0.1 second) elapses, # 201 to # 201. The conversion map data MU is updated by performing the process of step # 203 (steps # 208 and # 209).

[Effects of Second Embodiment]
Thus, since the pump part P has a mechanical structure in which the discharge pressure at the discharge port 12 is determined by operating the adjustment ring 21 against the urging force of the adjustment spring 23 by the action of hydraulic pressure, the adjustment ring at each temperature. The discharge pressure when 21 is in the non-operating position and the discharge pressure when the adjustment ring 21 reaches the operating limit are determined. Therefore, the conversion map data MU generated by similarity conversion of the basic map data MS based on these two types of discharge pressure has a data structure reflecting the rotation speed and the oil temperature. When the engine E is in operation, the target current value can be acquired by referring to the conversion map data MU with the target hydraulic pressure.

  In order to compare with the conversion map data MU, map data configured to acquire the target current value from the target hydraulic pressure by combining the rotation speed and the oil temperature is imagined. In the data of this configuration, the number of combinations of the rotation speed and the oil temperature is enormous, so the number of map data also increases. For this reason, a large storage area is required in order to store the map data in a nonvolatile memory or the like, which leads to inconvenience that the effort for configuring the map data becomes too large. On the other hand, in the case of generating the conversion map data MU as described above, not only a simple process of converting the basic map data MS to generate the conversion map data MU is required, but also the data amount of the conversion map data is reduced. The electromagnetic valve V can be controlled by setting an optimum target current value.

  Furthermore, the conversion map data MU has, for example, a data structure that is an orthogonal coordinate system in which the horizontal axis indicates the current value as shown in FIG. 11 and the vertical axis corresponds to the variable ratio in which the discharge pressure ranges from 0 to 1. Have. For this reason, it is possible to acquire the target current value by converting the target hydraulic pressure into a variable ratio and referring to the conversion map data MU at this variable ratio.

  Further, since the conversion map data MU is updated at set intervals as shown in the flowchart of FIG. 12, even when the rotation speed of the engine E changes or when the oil temperature changes, the conversion map data MU reflecting these changes. Can be updated. Thereby, the target current value can always be acquired based on the latest conversion map data MU by setting the setting interval to a relatively short time.

[Another embodiment of the second embodiment]
In addition to the second embodiment described above, the present invention may be configured as follows (the components having the same functions as those of the second embodiment are given the same numbers and symbols as those of the embodiment).

(A) The data structure of the conversion map data MU is set so that the actual value of the discharge pressure (target hydraulic pressure / target fluid pressure) is indicated on the vertical axis of the conversion map data MU. In such a data structure, conversion by the variable ratio conversion unit 46 is not required, and the target hydraulic pressure (target fluid) included in the range of the maximum hydraulic pressure (maximum fluid pressure: Max) and the minimum hydraulic pressure (minimum fluid pressure: Min). The target current value can be acquired by referring to the conversion map data MU with the pressure value.

(B) Since the start point a and the end point b described above are shifted in the horizontal axis direction also depending on the rotation speed of the inner rotor 14, the change point setting unit 44 detects the rotation detected by the rotation speed sensor SR. Based on the number, the start point a after the shift may be set as the change start point m, and the end point b after the shift may be set as the change end point n.

(C) The pump unit P may cause the adjustment spring 23 (biasing mechanism) to act in a direction that reduces the fluid discharge pressure. In this way, even if the urging direction is set in the reverse direction, it is possible to set the discharge pressure by setting the conversion map data MU.

  The present invention can be used in a pump device having a variable displacement pump unit and a control unit.

5 Control flow path 11 Suction port 12 Discharge port 14 Inner rotor 14A Outer tooth 15 Outer rotor 15A Inner tooth 21 Adjustment ring (adjustment member)
23 Adjustment spring (biasing mechanism)
31 Pressure value conversion unit 33 Map data storage unit 34 Map data reference unit 35 Polarization value setting unit 36 Output current control unit 41 Sub data setting unit (data conversion unit)
42 Similarity converter (data converter)
44 Change point setting section (data conversion section)
C Control unit D Definition area E Engine (drive source)
H Housing P Pump part V Control valve X Drive shaft core (first shaft core)
Y driven shaft core (second shaft core)
SR Speed sensor ST Temperature sensor M Map data MS Basic map data MU Conversion map data Max Upper limit Min Lower limit α First inflection value β Second inflection value m Change start point n Change end point

Claims (6)

An inner rotor having a plurality of external teeth and rotatable about the first axis, and a plurality of inner teeth engaging with a part of the plurality of outer teeth of the inner rotor, and rotatable about the second axis An outer rotor, a housing for housing these, and a suction port and a discharge port formed in the housing,
An adjusting member that rotatably supports the outer rotor and that adjusts a fluid discharge pressure at the discharge port by changing a positional relationship between the first shaft core and the second shaft core;
An urging mechanism for urging the adjusting member in an increasing or decreasing direction of the discharge pressure, and a pressure of fluid from the discharge port are applied to the adjusting member against the urging force of the urging mechanism. A variable capacity pump unit comprising a control flow path for applying pressure and an electromagnetic valve interposed in the control flow path for adjusting a fluid pressure acting on the adjustment member;
A rotation speed sensor that detects a rotation speed per unit time of a drive source that drives the inner rotor or the outer rotor, and a control unit that controls the electromagnetic valve,
The control unit includes a map data storage unit capable of extracting a plurality of stored map data corresponding to the rotational speed of the drive source, and a conversion target fluid that provides target fluid pressure as one-dimensional position information in a definition region. A pressure value conversion unit that converts pressure, a map data reference unit that acquires the target current value by referring to the map data with the converted target fluid pressure, and an output current that outputs the acquired target current value to the electromagnetic valve And a control unit,
The map data has a data structure represented by an orthogonal coordinate system in which the definition area is taken in the direction of a target axis and the target current value is taken in the direction of an output axis perpendicular to the target axis,
The pressure value conversion unit includes a first inflection value of the definition region in the map data based on a rotation speed of the driving source detected by the rotation speed sensor and a temperature of the fluid detected by a temperature sensor. And a second inflection value.   The pump device according to claim 1, wherein the definition region is set as a numerical value range of 0 to 1. Of the current supplied to the electromagnetic valve based on the temperature of the fluid detected by the temperature sensor, the first inflection value is a current at which displacement of the adjustment member starts due to fluid pressure acting on the adjustment member. And an inflection value setting unit for setting the second inflection value that is a current at which the adjustment member reaches a displacement limit and the displacement ends.
3. The pump device according to claim 1, wherein the output current control unit supplies a current to the electromagnetic valve based on the first change value and the second change value. An inner rotor having a plurality of external teeth and rotatable about the first axis, and a plurality of inner teeth engaging with a part of the plurality of outer teeth of the inner rotor, and rotatable about the second axis An outer rotor, a housing for housing these, and a suction port and a discharge port formed in the housing,
An adjusting member that rotatably supports the outer rotor and that adjusts a fluid discharge pressure at the discharge port by changing a positional relationship between the first shaft core and the second shaft core;
An urging mechanism for urging the adjusting member in an increasing or decreasing direction of the discharge pressure, and a pressure of fluid from the discharge port are applied to the adjusting member against the urging force of the urging mechanism. A variable capacity pump unit comprising a control flow path for applying pressure and an electromagnetic valve interposed in the control flow path for adjusting a fluid pressure acting on the adjustment member;
A rotation speed sensor that detects the rotation speed per unit time of the inner rotor or the outer rotor, a temperature sensor that detects the temperature of the fluid, and a control unit that controls the electromagnetic valve,
The control unit includes basic map data indicating a relationship between a current supplied to the electromagnetic valve at a specific fluid temperature and a fluid discharge pressure at the discharge port, and the number of rotations detected by the rotation number sensor and the temperature A data conversion unit that obtains a maximum fluid pressure and a minimum fluid pressure based on a fluid temperature detected by a sensor and generates conversion map data by converting at least the basic map data based on these values. And
The control unit obtains a target current value to be supplied to the electromagnetic valve by referring to the conversion map data with a set target fluid pressure, and drives the electromagnetic valve with a current corresponding to the target current value. Pump device. In the orthogonal coordinate system in which the conversion map data takes a current value in one axial direction and discharge pressure in an axial direction orthogonal thereto, the change starting point at which the adjustment member starts operating as the current value increases. And a data structure having a conversion line of an inclined posture that connects the change end point at which the adjustment member reaches the operating limit,
The said control unit is provided with the change point setting part which sets the said change start point and the said change end point based on the detection result of the said rotation speed sensor, and the detection result of the said temperature sensor. Pumping equipment.   The pump device according to claim 5, wherein the conversion map data is configured as a data structure in which the discharge pressure is in a range of 0 to 1 so that the value of the maximum discharge pressure in the axial direction indicating the discharge pressure is 1. .

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