JP2018053987A - Hydraulic control device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic control device and a program in which a reduction in fuel consumption of a vehicle can be restricted during studying of an operation characteristic of a solenoid valve.SOLUTION: A hydraulic control device 10 comprises a history memory part 210 for storing a history information indicating a correspondence between a driving electric current of a solenoid valve and an operation hydraulic pressure generated by the solenoid valve; an initial characteristic information memory part 220 for storing an initial characteristic information; a lower limit side hydraulic standard value memory part 230 for storing the lower limit side hydraulic standard value; a characteristic information generating part 120 for generating, on the basis of the history information, hydraulic characteristic information indicating a correspondence between a driving electric current of the solenoid valve and an operation hydraulic pressure generated by the solenoid valve when the history information satisfies a prescribed condition; a deviation calculation part 130 for calculating a deviation between a hydraulic pressure indicated by the initial characteristic information and a lower limit side hydraulic standard value on the basis of the initial characteristic information and the lower limit side hydraulic standard value; and a driving electric current calculating part 140 for calculating the driving electric current on the basis of the hydraulic characteristic information and calculating the driving electric current on the basis of a deviation calculated by the deviation calculating part when the hydraulic characteristic information is not generated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hydraulic control device and a program.

  Conventionally, a control device for an in-vehicle automatic transmission that controls a gear ratio by controlling hydraulic pressure of hydraulic oil supplied to a primary pulley and a secondary pulley has been proposed. If the hydraulic pressure of the hydraulic oil supplied to the pulley is too high, the friction of the belt wound between the pulleys may increase, and the fuel efficiency of the vehicle may decrease. Therefore, in order to improve the fuel consumption of the vehicle, it is desirable that the control device controls the hydraulic pressure of the hydraulic oil by reducing the hydraulic pressure within a range where no belt slip occurs. In this control, by learning the operating characteristics of the electromagnetic valve that controls the hydraulic pressure, the hydraulic pressure of the hydraulic oil can be lowered according to the operating characteristics of the individual electromagnetic valves. Here, when the control for learning the operation characteristics of the solenoid valve is performed, there is a problem as to what information should be used to control the solenoid valve when the learning of the operation characteristics is not completed. Conventionally, for example, as shown in Patent Document 1, when learning of the operation characteristics of an electromagnetic valve has not been completed, a technique for controlling hydraulic pressure by performing hydraulic pressure feedback control using a pressure sensor has been proposed. ing.

JP 2003-301935 A

  In the conventional control device as described above, since the pressure cannot be reduced according to the operation characteristics of each solenoid valve while learning of the operation characteristics of the solenoid valve is not completed, individual variations of the solenoid valves are considered. There is no choice but to control the pressure, and depending on the individual solenoid valve, the pressure may not be sufficiently reduced. In other words, in the conventional control device, there is a problem that the fuel consumption of the vehicle is lowered during learning of the operating characteristics depending on the individual characteristics of the operating valves due to the variation of the operating characteristics of the solenoid valves.

  The present invention has been made in view of the above points, and provides a hydraulic control device and a program capable of suppressing a reduction in fuel consumption of a vehicle during learning of operating characteristics regardless of individual variations in operating characteristics of solenoid valves. One of the purposes is to do.

  One aspect of the present invention is a hydraulic control device that controls the hydraulic pressure of hydraulic oil supplied to an automatic transmission via the electromagnetic valve by controlling a drive current of the electromagnetic valve. Based on the output of a hydraulic pressure sensor that measures the hydraulic pressure, history information that stores the history information indicating the correspondence between the drive current of the solenoid valve and the hydraulic pressure of the hydraulic fluid generated by the solenoid valve to which the drive current is supplied is stored. An initial characteristic information storage unit that stores hydraulic characteristic measured for each electromagnetic valve in the initial use state of the electromagnetic valve as initial characteristic information, and hydraulic pressure of the hydraulic oil supplied to the automatic transmission. A lower limit hydraulic standard value storage unit that stores a lower limit hydraulic standard value indicating a lower limit value, and when the history information stored in the history storage unit satisfies a predetermined condition, the drive current of the solenoid valve, Drive current is supplied The hydraulic characteristic information indicating the correspondence with the hydraulic pressure of the hydraulic oil generated by the electromagnetic valve is generated based on the history information stored in the history storage unit, and the initial characteristic information storage unit Based on the stored initial characteristic information and the lower limit hydraulic standard value of the automatic transmission stored in the lower limit hydraulic standard value storage unit, the hydraulic pressure indicated by the initial characteristic information and the lower limit hydraulic standard value A deviation calculating unit that calculates a deviation; and a driving current calculating unit that calculates the driving current, and the driving current calculating unit generates the hydraulic pressure when the hydraulic characteristic information is generated by the characteristic information generating unit. The drive current is calculated based on characteristic information, and when the hydraulic pressure characteristic information is not generated by the characteristic information generation unit, the drive current is calculated based on the deviation calculated by the deviation calculation unit. A pressure control device.

  One aspect of the present invention is an apparatus for controlling the hydraulic pressure of hydraulic fluid supplied to an automatic transmission via the solenoid valve by controlling the drive current of the solenoid valve, wherein the hydraulic pressure of the hydraulic fluid is reduced. A history storage unit that stores history information indicating a correspondence between the drive current of the solenoid valve and the hydraulic pressure of the hydraulic oil generated by the solenoid valve to which the drive current is supplied based on the output of the hydraulic sensor to be measured; And stored in the history storage unit in a computer provided in a hydraulic control device including an initial characteristic information storage unit that stores hydraulic characteristic measured for each electromagnetic valve in the initial use state of the electromagnetic valve as initial characteristic information. When the history information satisfies a predetermined condition, the solenoid valve drive current and the solenoid valve to which the drive current is supplied are generated based on the history information stored in the history storage unit. The initial characteristic information indicates based on a characteristic information generation step for generating hydraulic characteristic information indicating a correspondence with the hydraulic pressure of the hydraulic oil, the initial characteristic information, and a lower limit hydraulic pressure standard value of the automatic transmission. A deviation calculating step for calculating a deviation between a hydraulic pressure and a lower limit hydraulic pressure standard value, and when the hydraulic characteristic information is generated in the characteristic information generating step, a first for calculating the drive current based on the hydraulic characteristic information A drive current calculation step; a second drive current calculation step for calculating the drive current based on the deviation calculated in the deviation calculation step when the hydraulic pressure characteristic information is not generated in the characteristic information generation step; Is a program for executing

  According to one aspect of the present invention, there is provided a hydraulic control device and program capable of suppressing a reduction in fuel consumption of a vehicle during learning of operating characteristics regardless of individual variations in operating characteristics of electromagnetic valves.

It is a block diagram which shows an example of a structure of the hydraulic control apparatus of this embodiment. It is a figure which shows an example of the initial hydraulic pressure characteristic information of this embodiment. It is a figure which shows an example of the lower limit side hydraulic pressure standard information of this embodiment. It is a figure which shows an example of operation | movement of the hydraulic control apparatus of this embodiment. It is a figure which shows an example of the operation | movement of correction | amendment control by the hydraulic control apparatus of this embodiment. It is a figure which shows an example of the relationship between the drive current of this embodiment, and the hydraulic pressure of hydraulic fluid.

[Embodiment]
Hereinafter, a hydraulic control apparatus according to an embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention.

  FIG. 1 is a block diagram illustrating an example of a configuration of a hydraulic control device 10 according to the present embodiment. The hydraulic control device 10 supplies hydraulic pressure to the automatic transmission TM of the vehicle based on a shift command from the host unit 20.

[Outline of automatic transmission TM]
The automatic transmission TM includes a primary pulley PP, a secondary pulley SP, and a belt VT. A rotational force output from a prime mover (not shown) is transmitted to the primary pulley PP. The belt VT is wound between the primary pulley PP and the secondary pulley SP, and transmits the rotational force transmitted to the primary pulley PP to the secondary pulley SP. The secondary pulley SP transmits the rotational force transmitted from the belt VT to a vehicle wheel (not shown) via a rotational force transmission mechanism (not shown).

Both the primary pulley PP and the secondary pulley SP have a variable pulley width.
Specifically, the primary pulley PP includes a fixed primary pulley PP1 and a movable primary pulley PP2. As the movable primary pulley PP2 moves in the direction of the rotation axis of the pulley, the pulley width of the primary pulley PP changes.
The surface on which the belt VT of these pulleys is wound is conical. In the state where the pulley width is wide, the belt VT contacts the inner peripheral portion of the pulley. In the state where the pulley width is narrow, the belt VT contacts the outer peripheral portion of the pulley. The reduction gear ratio is changed by changing the pulley width of the primary pulley PP and the pulley width of the secondary pulley SP. Specifically, when the pulley width of the primary pulley PP is widened and the pulley width of the secondary pulley SP is narrowed, the reduction ratio is increased. Conversely, if the pulley width of the primary pulley PP is narrowed and the pulley width of the secondary pulley SP is widened, the reduction gear ratio becomes small.

  Each of the primary pulley PP and the secondary pulley SP includes an oil chamber (not shown). The positions of these pulleys in the direction of the rotation axis of the pulleys are determined by the amount of hydraulic oil present in the oil chamber. These pulleys move in the direction in which the pulley width increases as the amount of hydraulic oil present in the oil chamber increases, and move in the direction in which the pulley width decreases as the amount of hydraulic oil decreases. Conversely, these pulleys may move in a direction in which the pulley width decreases as the amount of hydraulic oil present in the oil chamber increases, and may move in a direction in which the pulley width increases as the amount of hydraulic oil decreases. .

  The primary pulley PP and the secondary pulley SP are applied with a force acting in the direction of increasing the pulley width from the belt VT due to the tension of the belt VT. The primary pulley PP and the secondary pulley SP are supplied with hydraulic oil pressurized to a predetermined pressure in order to resist this force. In the following description, this predetermined pressure is also referred to as supply pressure. The setting range of the supply pressure is about 4 to 5 [Mpa] in the example of the present embodiment. That is, the hydraulic oil pressurized to about 4 to 5 [Mpa] is supplied to the primary pulley PP and the secondary pulley SP.

[Overview of Hydraulic Supply Unit 30]
The hydraulic pressure supply unit 30 includes an oil pan OP, an oil pump P, a solenoid valve V, and a hydraulic pressure sensor PS, and supplies the hydraulic oil OIL pressurized by the oil pump P to the automatic transmission TM.
The oil pump P is provided between the hydraulic oil pipe HP1 and the hydraulic oil pipe HP2, and sucks up the hydraulic oil OIL stored in the oil pan OP via the hydraulic oil pipe HP1 to the hydraulic oil pipe HP2. Discharge. That is, the oil pump P moves the hydraulic oil in the direction of arrow A in the drawing. The oil pump P is, for example, an electric pump or a pump that rotates by driving an engine. When the oil pump P is an electric pump, it operates based on control by a control unit (not shown).
The solenoid valve V is provided between the hydraulic oil pipe HP2 and the hydraulic oil pipe HP3. The solenoid valve V includes a solenoid SL. The electromagnetic valve V changes the valve opening according to the magnitude of the drive current I supplied to the solenoid SL. In an example of this embodiment, when the drive current I is larger, the solenoid valve V makes the valve opening smaller. Further, when the drive current I is smaller, the solenoid valve V increases the valve opening degree. The solenoid valve V operates to be supplied to the automatic transmission TM by increasing / decreasing the valve opening and increasing / decreasing the amount of hydraulic oil OIL pressurized by the oil pump P in the direction of arrow B in the figure. The supply pressure of the oil OIL is controlled. That is, the electromagnetic valve V functions as a supply pressure control valve for the hydraulic oil OIL supplied to the automatic transmission TM.
The hydraulic pressure sensor PS is provided between the hydraulic oil pipe HP3 and the hydraulic oil pipe HP4, and detects the hydraulic pressure of the hydraulic oil OIL supplied to the automatic transmission TM, that is, the supply pressure. The hydraulic pressure sensor PS outputs the detected pressure to the hydraulic pressure control device 10 as a measured hydraulic pressure signal SOP.

  The hydraulic pressure supply unit 30 may include an accumulator ACC. The accumulator ACC stores hydraulic oil OIL to which the hydraulic pressure generated by the oil pump P is attached. By providing the accumulator ACC, the hydraulic pressure supply unit 30 can reduce oil pressure pulsation and surge due to the operation of the oil pump P. Further, the hydraulic pressure supply unit 30 includes the accumulator ACC, and can apply pressure to the hydraulic oil OIL in a state where the oil pump P is stopped.

  Hereinafter, the control of the hydraulic oil supply pressure by the hydraulic control device 10 will be described. Note that description of which of the primary pulley PP and the secondary pulley SP is supplied with the hydraulic oil OIL, that is, control of the transmission ratio, is omitted.

[Configuration of Hydraulic Control Device 10]
The configuration of the hydraulic control device 10 will be described. The hydraulic control apparatus 10 includes a calculation unit 100, a storage unit 200, a drive current output unit 300, and a hydraulic signal acquisition unit 400. The input side of the hydraulic control device 10 is connected to the host unit 20 and the hydraulic sensor PS. The output side of the hydraulic control device 10 is connected to the solenoid SL of the electromagnetic valve V.
The hydraulic control device 10 may control the discharge hydraulic pressure by controlling the rotation speed of the oil pump P. Description of the control of the discharge hydraulic pressure of the oil pump P by the hydraulic control device 10 will be omitted. Hereinafter, the case where the discharge hydraulic pressure of the oil pump P is constant will be described.

  The storage unit 200 includes a history storage unit 210, an initial characteristic information storage unit 220, and a lower limit side hydraulic pressure standard value storage unit 230.

[About history information]
History information OH is stored in the history storage unit 210. The history information OH is based on the output of the hydraulic pressure sensor PS that measures the hydraulic pressure of the hydraulic oil OIL, and the hydraulic current of the hydraulic oil OIL that is generated by the drive current I of the solenoid valve V and the solenoid valve V to which the drive current I is supplied. It is the information which shows the correspondence with. Specifically, the history storage unit 210 associates the drive current value DC of the solenoid valve V with the measured hydraulic signal SOP of the hydraulic oil OIL at the timing when the solenoid valve V is driven by the drive current value DC. And stored as history information OH.

[Initial hydraulic characteristics information]
The initial characteristic information storage unit 220 stores initial hydraulic characteristic information HCI. An example of the initial hydraulic pressure characteristic information HCI will be described with reference to FIG.

FIG. 2 is a diagram illustrating an example of the initial hydraulic pressure characteristic information HCI according to the present embodiment. The initial characteristic information storage unit 220 associates the current value of the drive current I that drives the solenoid SL of the solenoid valve V with the supply pressure of the hydraulic oil OIL when the drive current I of this current value is supplied. And stored as initial hydraulic pressure characteristic information HCI. The supply pressure of the hydraulic oil OIL here is the hydraulic pressure measured in the initial use state of the solenoid valve V, that is, the initial use hydraulic pressure PI.
This initial hydraulic pressure characteristic information HCI indicates the relationship between the drive current I and the supply pressure of the hydraulic oil OIL measured for each solenoid valve V in the initial use state of the solenoid valve V. That is, the initial hydraulic pressure characteristic information HCI indicates the drive current-hydraulic characteristic in the initial use state of each product of the solenoid valve V. In the following description, the drive current-hydraulic characteristic in the initial use state of the electromagnetic valve V is also referred to as “hydraulic characteristic in the initial use state of the electromagnetic valve V” or simply “initial hydraulic characteristic of the electromagnetic valve V”.

  The initial hydraulic pressure characteristic of the solenoid valve V stored in the initial hydraulic pressure characteristic information HCI can be measured in a shipping inspection at the time of factory shipment of the solenoid valve V. In the case of measurement at the time of shipping inspection of the solenoid valve V, measurement by a standardized procedure is possible, and accurate initial hydraulic pressure characteristic information HCI is obtained.

  As a specific example, the initial characteristic information storage unit 220 stores drive current I = 200 [mA] and used initial hydraulic pressure PI = 4500 [kPa] as initial hydraulic characteristic information HCI in association with each other. Yes. In the initial characteristic information storage unit 220, the driving current I = 600 [mA] and the used initial hydraulic pressure PI = 1500 [kPa], the driving current I = 800 [mA], and the used initial hydraulic pressure PI = 500 [kPa]. ], The drive current I = 1000 [mA] and the used initial hydraulic pressure PI = 200 [kPa] are associated with each other and stored as the initial hydraulic pressure characteristic information HCI.

The initial use hydraulic pressure PI is an example of hydraulic characteristic data measured when the electromagnetic valve V is inspected. That is, the use initial hydraulic pressure PI is hydraulic characteristic data measured in the initial use state of the electromagnetic valve V such as a shipping inspection among the hydraulic characteristic data of the electromagnetic valve V. In the following description, the initial use hydraulic pressure PI is also referred to as an inspection measurement pressure _Pc .

The relationship between the drive current I of the solenoid valve V and the hydraulic pressure of the hydraulic oil OIL differs depending on the product of the solenoid valve V due to the dimensional error and assembly error of the solenoid valve V. The initial hydraulic characteristic information HCI is acquired for each product of the solenoid valve V.
The initial characteristic information storage unit 220 is configured by a nonvolatile storage element capable of additionally writing information or rewriting information. In the factory inspection of the solenoid valve V, initial hydraulic characteristic information HCI is acquired for each product of the solenoid valve V. The acquired initial hydraulic characteristic information HCI is written in the initial characteristic information storage unit 220 of the hydraulic control apparatus 10 that controls the solenoid valve V.

  Here, the solenoid valve V and the hydraulic control device 10 may be separately delivered to a vehicle assembly factory. In this case, of the plurality of electromagnetic valves V, which one of the electromagnetic valves V is combined with the hydraulic control device 10 depends on whether the electromagnetic valve V is assembled to the vehicle in the vehicle assembly process, This is determined by determining the individual control device 10. When the combination of the individual solenoid valve V and the individual hydraulic control device 10 to be assembled in the vehicle is determined, the initial hydraulic characteristic information HCI to be stored in the initial characteristic information storage unit 220 of the hydraulic control device 10 is specified. The

  The initial hydraulic characteristic information HCI may be displayed on the exterior portion of the solenoid valve V. For example, the initial hydraulic characteristic information HCI is displayed by sticking a sticker indicating the initial hydraulic characteristic information HCI with a two-dimensional code on the exterior of the solenoid valve V, or the two-dimensional code is stamped on the exterior of the solenoid valve V. Is displayed. In this case, after determining the combination of the individual electromagnetic valve V and the individual hydraulic control device 10 assembled in the vehicle, the initial hydraulic characteristic information HCI of the individual is read by a scanner or the like. Further, the read initial hydraulic characteristic information HCI is written in the initial characteristic information storage unit 220 of the hydraulic control device 10.

[Lower limit hydraulic pressure standard]
The lower limit hydraulic pressure standard value storage unit 230 stores lower limit hydraulic pressure standard information LL. An example of the lower limit hydraulic pressure standard information LL will be described with reference to FIG.

FIG. 3 is a diagram illustrating an example of the lower limit side hydraulic pressure standard information LL of the present embodiment. The lower limit hydraulic standard value storage 230 stores the current value of the drive current I that drives the solenoid SL of the solenoid valve V, and the lower limit hydraulic standard value P of the hydraulic oil OIL when this drive current I is supplied. _s is associated and stored as lower limit side hydraulic pressure standard information LL. Lower limit hydraulic standard information LL indicates the relationship between the hydraulic pressure of the lower-side oil pressure standard value P _s of the hydraulic oil OIL and the driving current I of the solenoid valve V.
That is, the lower limit hydraulic pressure standard value storage unit 230, the lower limit hydraulic pressure standard value P _s indicating the pressure of the lower limit value of the hydraulic oil OIL supplied to the automatic transmission TM is stored.

Here, the lower limit oil pressure standard value P _s, a value which is managed as a design standard value of the solenoid valve V. This lower limit side hydraulic standard value P _s is the pressure of the hydraulic oil OIL supplied to the automatic transmission TM via the solenoid valve V when the drive current I having a predetermined current value is supplied to the solenoid valve V, that is, Indicates the lower limit of supply pressure.

As a specific example, the lower limit side hydraulic standard value storage unit 230 is associated with a drive current I = 200 [mA] and a lower limit side hydraulic standard value P _s = 4000 [kPa], so It is stored as information LL. The initial characteristic information storage unit 220 includes a drive current I = 600 [mA] and a lower limit hydraulic pressure standard value P _s = 1000 [kPa], and a drive current I = 800 [mA] and a lower limit hydraulic pressure standard value P. _s = 300 [kPa] is associated with the drive current I = 1000 [mA] and the lower limit hydraulic standard value P _s = 100 [kPa], and is stored as the lower limit hydraulic standard information LL. .

  Returning to FIG. 1, the hydraulic pressure signal acquisition unit 400 acquires a signal indicating the hydraulic pressure of the hydraulic oil OIL detected by the hydraulic pressure sensor PS. The “signal indicating the hydraulic pressure of the hydraulic oil OIL” here is, for example, the measured hydraulic pressure signal SOP. The measured hydraulic pressure signal SOP is a signal having electrical characteristics corresponding to the hydraulic pressure detected by the hydraulic pressure sensor PS. The measured hydraulic pressure signal SOP has, for example, a potential, a current value, a duty ratio, or a frequency characteristic corresponding to the magnitude of the hydraulic pressure detected by the hydraulic pressure sensor PS. The hydraulic pressure signal acquisition unit 400 supplies the acquired measured hydraulic pressure signal SOP to the calculation unit 100.

  The calculation unit 100 includes a CPU (Central Processing Unit), and includes a history information generation unit 110, a characteristic information generation unit 120, a deviation calculation unit 130, and a drive current calculation unit 140 as functional units. .

  The history information generation unit 110 generates history information OH based on the drive current value DC and the measured hydraulic pressure signal SOP. Specifically, the history information generation unit 110 acquires the measured hydraulic pressure signal SOP supplied by the hydraulic pressure signal acquisition unit 400. In addition, the history information generation unit 110 acquires the drive current value DC. Here, the drive current value DC is a signal indicating the current value of the drive current I calculated by the drive current calculation unit 140. The history information generation unit 110 generates history information OH based on the acquired measured hydraulic pressure signal SOP and the drive current value DC.

The history information generation unit 110 generates history information OH at a predetermined timing (for example, every second).
Here, the control target value TGT output by the host unit 20 changes every moment according to the traveling state of the vehicle. Therefore, the drive current value DC of the drive current I controlled according to the control target value TGT changes every moment. Here, the learning accuracy of the drive current-hydraulic characteristic of the solenoid valve V can be improved by obtaining the correspondence between the drive current value DC and the measured hydraulic pressure signal SOP at various drive current values DC. In other words, the history information generation unit 110 stores the correspondence relationship between the drive current value DC and the measured hydraulic pressure signal SOP for a plurality of different drive current values DC within the range of the drive current value DC in which the solenoid valve V can operate. What is necessary is just to memorize | store in the part 210. As an example, when the range of the drive current value DC in which the solenoid valve V can operate is 200 [mA] to 1000 [mA], the history information generating unit 110 has the drive current value DC of 200 [mA] and 600 [mA]. ], The correspondence relationship between the drive current value DC and the measured hydraulic pressure signal SOP for each point of 800 [mA] and 1000 [mA] is stored in the history storage unit 210.

Note that the history information generation unit 110 may generate the history information OH at a predetermined timing determined based on an index indicating a change with time of the drive current-hydraulic characteristic of the solenoid valve V. As an example, the condition “every time the accumulated drive time of the solenoid valve V passes a predetermined time (for example, 100 hours after storing the previous history information OH)” is a predetermined condition for generating the history information OH. The case where it is determined will be described.
In this case, the history information generation unit 110 calculates the cumulative drive time of the solenoid valve V with reference to the previous generation timing of the history information OH. The history information generation unit 110 compares the accumulated drive time with a predetermined time (for example, 100 hours), and generates history information OH when the accumulated drive time exceeds the predetermined time.
More specifically, the history information generation unit 110 acquires the drive current value DC and the measured hydraulic pressure signal SOP at the generation timing of the history information OH. The history information generation unit 110 associates the acquired drive current value DC with the measured hydraulic pressure signal SOP and causes the history storage unit 210 to store them. As a result, history information OH is stored in the history storage unit 210 every time a predetermined driving time (for example, 100 hours) of the electromagnetic valve V elapses.
As described above, the history information generation unit 110 generates the history information OH at a predetermined timing determined based on the index indicating the change over time of the drive current-hydraulic characteristic of the solenoid valve V, so that the history information generation unit 110 changes the solenoid valve V over time. The history information OH can be stored in a state in which various characteristic changes have converged.

  The characteristic information generation unit 120 generates post-learning hydraulic characteristic information HCL based on the history information OH stored in the history storage unit 210. Here, the post-learning hydraulic pressure characteristic information HCL is information indicating the result of learning the drive current-hydraulic characteristic of the electromagnetic valve V that has changed over time from the initial use state due to the use of the electromagnetic valve V. The post-learning hydraulic characteristic information HCL indicates the drive current-hydraulic characteristic of the solenoid valve V after the change, the hydraulic current of the hydraulic oil OIL generated by the drive current I of the solenoid valve V and the solenoid valve V to which the drive current I is supplied. It shows by correspondence with.

  When the history information OH stored in the history storage unit 210 satisfies a predetermined condition, the characteristic information generation unit 120 determines that the learning of the drive current-hydraulic characteristic has been completed, and generates post-learning hydraulic characteristic information HCL. . The predetermined conditions for the end of learning are (1) a case where a predetermined amount of history information OH is stored in the history storage unit 210, and (2) a control target value TGT of hydraulic pressure and the history storage unit 210. And a case where the deviation DV from the hydraulic pressure indicated by the history information OH is equal to or less than a predetermined value.

  As an example, the characteristic information generation unit 120 determines that the learning of the drive current-hydraulic characteristic has been completed when a predetermined amount of history information OH is stored in the history storage unit 210, and generates post-learning hydraulic characteristic information HCL. To do. In this case, the characteristic information generation unit 120 determines whether or not the history information OH stored in the history storage unit 210 has reached a predetermined amount. When it is determined that the history information OH stored in the history storage unit 210 has reached a predetermined amount, the characteristic information generation unit 120 determines that learning of the drive current-hydraulic characteristic has ended, and the post-learning hydraulic characteristic information HCL Is generated.

  Further, as an example, the characteristic information generation unit 120 drives the drive current-hydraulic pressure when the deviation between the hydraulic control target value TGT and the hydraulic pressure indicated by the history information OH stored in the history storage unit 210 is equal to or less than a predetermined value. It is determined that the characteristic learning is completed, and post-learning hydraulic characteristic information HCL is generated. In this case, the characteristic information generation unit 120 acquires the control target value TGT from the host unit 20 and the measured hydraulic signal SOP from the hydraulic sensor PS via the hydraulic signal acquisition unit 400. The characteristic information generation unit 120 calculates a deviation between the control target value TGT and the measured hydraulic pressure signal SOP. When the calculated deviation is equal to or smaller than the predetermined value, the characteristic information generation unit 120 determines that the learning of the drive current-hydraulic characteristic has been completed, and generates post-learning hydraulic characteristic information HCL.

  The post-learning hydraulic pressure characteristic information HCL generated by the characteristic information generation unit 120 is used by the drive current calculation unit 140 to calculate a drive current value DC for causing the hydraulic sensor PS to follow the control target value TGT.

Deviation calculating unit 130, the initial characteristic information learned after the hydraulic pressure characteristic information stored in the storage unit 220 HCL, on the lower side oil pressure standard value P _s of the automatic transmission TM, which is stored in the lower limit hydraulic pressure standard value storage unit 230 based on, it calculates the deviation DV of the hydraulic and lower side oil pressure standard value P _s indicating the learning after the hydraulic characteristic information HCL.

  More specifically, the deviation calculating unit 130 calculates a deviation DV between the lower limit hydraulic standard information LL of the automatic transmission TM and the initial hydraulic characteristic information HCI. The deviation DV calculated by the deviation calculation unit 130 will be described.

As described above, the initial hydraulic pressure characteristic information HCI of the electromagnetic valve V is acquired for each individual electromagnetic valve V in a shipping inspection or the like at the assembly factory of the electromagnetic valve V. More specifically, when the driving current I ₁ is supplied, the supply pressure of the hydraulic oil OIL supplied from the electromagnetic valve V in the automatic transmission TM is measured as the test time measured pressure P _c1. The measured measurement pressure P _c1 at the time of inspection is recorded as initial hydraulic pressure characteristic information HCI in association with the current value of the drive current I ₁ . Next, the driving current I ₁ driving current I ₂ the current value is different from the supply pressure of the hydraulic oil OIL is a driving current I ₂ is supplied from the electromagnetic valve V when it is supplied to the automatic transmission TM, testing It is measured as the _hourly measured pressure _Pc2 . When measured test and measurement pressure P _c2 are associated with the current value of the driving current I _2, is recorded as the initial hydraulic pressure characteristic information HCI.

Here, in such shipping inspection of the factory of the solenoid valve V, the solenoid valve V is supply pressure indicated by the initial hydraulic pressure characteristic information HCI is in the acceptance criterion that does not fall below the lower limit hydraulic pressure standard value P _s, the solenoid valve Each V individual is examined. More specifically, the solenoid valve V includes a lower limit hydraulic standard value P _s1 that is a lower limit value of the measurement pressure P _c1 at the time of inspection with respect to the drive current I ₁ and a lower limit of the measurement pressure P _c2 at the time of inspection with respect to the drive current I ₂ . A lower limit hydraulic pressure standard value P _s2, which is a value, is predetermined.
Depending on the individual solenoid valve V, when the drive current I ₁ having a predetermined current value is supplied, the supply pressure of the hydraulic oil OIL supplied to the automatic transmission TM may be lower than the lower limit hydraulic pressure standard value P _s1. . For example, an electromagnetic valve V assembled failure occurs, supply pressure of the hydraulic oil OIL is sometimes lower than the lower limit oil pressure standard value P _s. If the supply pressure of the hydraulic oil OIL supplied from the electromagnetic valve V in the automatic transmission TM is less than the lower-side oil pressure standard value P _s, in some cases the automatic transmission TM does not operate properly.
Therefore, in shipping inspection of the factory of the solenoid valve V, when the supply pressure of the hydraulic oil OIL for individuals with solenoid valve V is less than the lower-side oil pressure standard value P _s manages the individual as a defective product, shipment Take measures such as stopping
That is, the individual solenoid valves V to be assembled to the vehicle, one of the individuals also have passed the inspection of the lower limit hydraulic pressure standard value P _s. In other words, the individual solenoid valves V to be assembled to the vehicle, one of the individuals also supply pressure of the hydraulic oil OIL is above the lower limit hydraulic pressure standard value P _s. Or supply pressure of the hydraulic oil OIL exceeds what extent the lower limit hydraulic pressure standard value P _s is the variation of the degree for each individual solenoid valve V.

If the supply pressure of the hydraulic oil OIL is closer to the lower limit hydraulic pressure standard value P _s is compared with the case of greatly exceeds the lower limit hydraulic pressure standard value P _s, the supply pressure of the hydraulic oil OIL is supplied to the automatic transmission TM Low. In the automatic transmission TM, friction is generated between the primary pulley PP and the belt VT and between the belt VT and the secondary pulley SP. This friction increases as the supply pressure of the hydraulic oil OIL supplied to the automatic transmission TM increases. When this friction is large, the rotational force transmission loss in the automatic transmission TM becomes larger than when the friction is small, and as a result, the fuel consumption of the vehicle deteriorates. Therefore, in order to improve the fuel efficiency of the vehicle, the supply pressure of the hydraulic oil OIL supplied to the automatic transmission TM is closer to the lower limit hydraulic pressure standard value P _s as compared to the case where much higher than the lower limit hydraulic pressure standard value P _s Is preferred.

Here, the deviation DV calculated by the deviation calculating unit 130 is a difference between the initial hydraulic pressure characteristic information HCI and the lower limit side hydraulic pressure standard information LL. That is, the deviation DV, which is a value that indicates whether the supply pressure of the individual solenoid valve V exceeds what extent the lower limit hydraulic pressure standard value P _s.
The deviation calculating unit 130 calculates, as the deviation DV, the deviation between the initial hydraulic characteristic information HCI of the individual stored in the initial characteristic information storage unit 220 and the lower limit hydraulic standard information LL for each individual electromagnetic valve V. .

  Note that the initial hydraulic pressure characteristic information HCI may be updated according to the time-dependent change of the solenoid valve V. In this case, the deviation calculation unit 130 calculates the deviation DV based on the updated initial hydraulic pressure characteristic information HCI. In this case, the deviation calculating unit 130 may calculate the deviation DV with reference to the initial hydraulic pressure characteristic information HCI updated every time the driving current calculating unit 140 calculates the driving current I. That is, the deviation calculation unit 130 may calculate the deviation DV by real-time processing. By configuring in this way, the deviation calculating unit 130 can calculate the deviation DV based on the hydraulic characteristics of the electromagnetic valve V that changes according to the time-dependent change of the vehicle, so that the calculation accuracy of the deviation DV is reduced. Can be deterred.

The drive current calculation unit 140 calculates a drive current value DC of the drive current I. In the following description, calculating the drive current value DC of the drive current I is also simply referred to as “calculating the drive current I”.
The drive current calculation unit 140 uses the drive current-hydraulic characteristics of the electromagnetic valve V used when calculating the drive current value DC of the drive current I depending on the situation. Specifically, when the characteristic information generation unit 120 has finished learning the drive current-hydraulic characteristic of the solenoid valve V, the drive current calculation unit 140 determines the drive current based on the learned hydraulic characteristic information HCL. A drive current value DC of I is calculated. Further, when the characteristic information generation unit 120 has not finished learning of the drive current-hydraulic characteristic of the solenoid valve V, the drive current calculation unit 140 is based on the deviation DV calculated by the deviation calculation unit 130. A drive current value DC of I is calculated. Hereinafter, the calculation procedure of the drive current I of the drive current calculation unit 140 will be described more specifically.

[Calculation procedure of drive current I (1): calculation based on post-learning hydraulic pressure characteristic information HCL]
The drive current calculation unit 140 calculates the drive current I based on the control target value TGT of the hydraulic pressure output from the host unit 20, the measured hydraulic pressure signal SOP output from the hydraulic pressure sensor PS, and the learned hydraulic pressure characteristic information HCL. .
In this case, the drive current calculation unit 140 acquires the control target value TGT from the upper unit 20. The drive current calculation unit 140 acquires the measured hydraulic pressure signal SOP from the hydraulic pressure sensor PS. The drive current calculation unit 140 acquires post-learning hydraulic pressure characteristic information HCL from the characteristic information generation unit 120. The drive current calculation unit 140 calculates a pressure deviation between the acquired control target value TGT and the measured hydraulic pressure signal SOP. The drive current calculation unit 140 calculates a drive current deviation ΔI corresponding to the calculated pressure deviation by referring to the learned hydraulic characteristic information HCL. The drive current calculation unit 140 calculates a drive current value DC of the new drive current I based on the calculated drive current deviation ΔI and the currently output drive current value DC. The drive current calculation unit 140 outputs the calculated drive current value DC to the drive current output unit 300.

[Calculation procedure (2) of drive current I: calculation based on deviation DV]
The drive current calculation unit 140 calculates the drive current I based on the control target value TGT of the hydraulic pressure output from the host unit 20, the measured hydraulic pressure signal SOP output from the hydraulic sensor PS, and the deviation DV calculated by the deviation calculation unit 130. calculate.
In this case, the drive current calculation unit 140 acquires the control target value TGT from the upper unit 20. The drive current calculation unit 140 acquires the measured hydraulic pressure signal SOP from the hydraulic pressure sensor PS. The drive current calculation unit 140 acquires the deviation DV from the deviation calculation unit 130. The drive current calculation unit 140 calculates a pressure deviation between the acquired control target value TGT and the measured hydraulic pressure signal SOP. The drive current calculation unit 140 calculates a drive current deviation ΔI corresponding to the calculated pressure deviation by referring to the deviation DV. The drive current calculation unit 140 calculates a drive current value DC of the new drive current I based on the calculated drive current deviation ΔI and the currently output drive current value DC. The drive current calculation unit 140 outputs the calculated drive current value DC to the drive current output unit 300.

  The drive current output unit 300 includes a current amplification circuit, and supplies a drive current I having a current value based on the signal of the drive current value DC output from the drive current calculation unit 140 to the solenoid SL of the solenoid valve V. Thereby, the opening degree of the electromagnetic valve V becomes an opening degree according to the drive current I. As a result, the solenoid valve V changes the hydraulic pressure of the hydraulic oil OIL to a hydraulic pressure based on the control of the hydraulic control device 10 and supplies the hydraulic transmission TM to the automatic transmission TM.

[Operation of Hydraulic Control Device 10]
Next, the operation of the hydraulic control device 10 will be described with reference to FIG.
FIG. 4 is a diagram illustrating an example of the operation of the hydraulic control device 10 of the present embodiment.

(Step S <b> 10) The hydraulic control apparatus 10 acquires the hydraulic control target value TGT from the upper unit 20.
(Step S20) The hydraulic pressure control device 10 acquires a measured hydraulic pressure, that is, a measured hydraulic pressure signal SOP, from the hydraulic pressure sensor PS.
(Step S30) The drive current calculation unit 140 of the hydraulic control device 10 calculates a deviation ΔP between the control target value TGT acquired in Step S10 and the measured hydraulic pressure signal SOP acquired in Step S20.

(Step S40) The history information generation unit 110 and the characteristic information generation unit 120 of the hydraulic control device 10 perform learning control. Here, the learning control refers to an operation of rewriting the driving current-hydraulic characteristic table of the solenoid valve V referred to by the driving current calculation unit 140 based on the history information OH.
Specifically, the history information generation unit 110 generates history information OH and causes the history storage unit 210 to store the generated history information OH. The characteristic information generation unit 120 acquires the history information OH stored in the history storage unit 210, and determines whether or not the acquired history information OH satisfies a predetermined condition.

  (Step S50) When the history information OH stored in the history storage unit 210 satisfies a predetermined condition, the characteristic information generation unit 120 determines that learning has ended, and generates post-learning hydraulic characteristic information HCL. For example, when the history information OH stored in the history storage unit 210 exceeds a predetermined amount, the characteristic information generation unit 120 determines that learning has ended, and generates post-learning hydraulic pressure characteristic information HCL.

(Step S60) The drive current calculation unit 140 determines whether learning by the characteristic information generation unit 120 has ended. If the drive current calculation unit 140 determines that learning has been completed (step S60; YES), the process proceeds to step S70. If the drive current calculation unit 140 determines that the learning has not ended (step S60; NO), the process proceeds to step S80.
(Step S70) The drive current calculation unit 140 calculates the drive current value DC based on the control target value TGT and the drive current-hydraulic characteristic table indicated by the learned hydraulic characteristic information HCL. The drive current calculation unit 140 outputs the calculated drive current value DC to the history information generation unit 110 and the drive current output unit 300.
(Step S80) When it is determined that the learning has not ended, the drive current calculation unit 140 controls the correction to the variation data lower limit standard for the drive current-hydraulic characteristic table of the solenoid valve V. I do.

[Correction control to variation data lower limit specification]
Next, with reference to FIG. 5, the operation of the correction control to the variation data lower limit standard in step S80 will be described.
FIG. 5 is a diagram illustrating an example of the correction control operation performed by the hydraulic control apparatus 10 according to the present embodiment. Each step of the operation shown in FIG. 5 shows an example of a specific operation of step S80 shown in FIG.

[(1) Calculation of deviation ΔP _c ]
(Step S8010) The drive current calculation unit 140 refers to the initial hydraulic pressure characteristic information HCI stored in the initial characteristic information storage unit 220, and determines the used initial hydraulic pressure PI ₂ corresponding to the drive current I ₂ at the time of inspection measurement pressure P _c2. Get as. As a specific example, in the initial hydraulic pressure characteristic information HCI shown in FIG. 2, when the driving current I ₂ = 1000 [mA], the used initial hydraulic pressure PI ₂ = 200 [kPa]. In this case, the drive current calculation unit 140 acquires the initial use hydraulic pressure PI ₂ = 200 [kPa] corresponding to the drive current I ₂ = 1000 [mA] as the measurement pressure P _c2 at the time of inspection.

(Step S8020) The drive current calculation unit 140 refers to the initial hydraulic pressure characteristic information HCI stored in the initial characteristic information storage unit 220, and determines the used initial hydraulic pressure PI ₁ corresponding to the drive current I ₁ at the time of inspection measurement pressure P _c1. Get as. As a specific example, in the initial hydraulic pressure characteristic information HCI shown in FIG. 2, when the driving current I ₁ = 200 [mA], the used initial hydraulic pressure PI ₁ = 4500 [kPa]. In this case, the drive current calculation unit 140 acquires the initial use hydraulic pressure PI ₁ = 4500 [kPa] corresponding to the drive current I ₁ = 200 [mA] as the measurement pressure P _c1 at the time of inspection.

(Step S8030) drive current calculation section 140, based on the drive current _{I 2} and the examination time measured pressure _{P c2} obtained in step S8010, the driving current _{I 1} and the examination time measured pressure _{P c1} obtained in step S8020 Thus, the slope of the drive current-hydraulic characteristic curve deviation Δ is calculated. In the following description, the slope of the drive current-hydraulic characteristic curve CC1 is also referred to as “deviation ΔP _c ”.

Here, the current value of the drive current I ₁ is different from the current value of the drive current I ₂ described above. That is, in step S8030 from step S8010, the drive current calculation section 140, the drive current I of the current value different for the two-point drive current - to obtain the hydraulic pressure characteristic, calculates a deviation [Delta] P _c. An example of the relationship between the drive current I and the hydraulic pressure of the hydraulic oil OIL is shown in FIG.

  FIG. 6 is a diagram illustrating an example of the relationship between the drive current I and the hydraulic pressure of the hydraulic oil OIL in the present embodiment. An example of the driving current-hydraulic characteristic calculated based on the initial hydraulic characteristic information HCI stored in the initial characteristic information storage unit 220 is shown in a driving current-hydraulic characteristic curve CC1. The drive current-hydraulic characteristic curve CC1 is a line segment obtained by linearly interpolating the initial hydraulic characteristic information HCI stored in the initial characteristic information storage unit 220.

  In this example, the case where the drive current-hydraulic characteristic curve CC1 is a line segment obtained by linearly interpolating the initial hydraulic characteristic information HCI is not limited to this, but is interpolated by a quadratic curve or a higher order curve. May be. The drive current calculation unit 140 corrects the drive current I by calculating the slope of the drive current-hydraulic characteristic curve CC1.

More specifically, in step S8010, the drive current calculation unit 140 refers to the initial hydraulic pressure characteristic information HCI, and calculates an intersection Q _c2 between the drive current I ₂ and the measurement pressure P _c2 at the time of inspection.
In step S8020, the drive current calculation unit 140 refers to the initial hydraulic pressure characteristic information HCI, and calculates an intersection point Q _c1 between the drive current I ₁ and the measurement pressure P _c1 at the time of inspection.
In step S8030, the drive current calculation section 140, and a point of intersection _{Q c2} and intersection _{Q c1} and linear interpolation driving current - determined hydraulic characteristic curves CC1, the driving current - slope of the hydraulic pressure characteristic curve CC1, i.e. the deviation [Delta] P _c calculate.

[(2) Calculation of Pressure Deviation ΔP ₂ at Pressure Adjustment Point]
Returning to (step S8040) Figure 5, the drive current calculation section 140 refers to the lower limit hydraulic standard information LL stored in the lower limit hydraulic pressure standard value storage unit 230, the lower limit hydraulic pressure corresponding to the drive current I ₂ The standard value P _s2 is acquired. In the specific example of the present embodiment, as shown in FIG. 3, the lower limit hydraulic pressure standard value P _s2 = 100 [kPa] corresponds to the drive current I ₂ = 1000 [mA]. In the case of this specific example, the drive current calculation unit 140 acquires a lower limit hydraulic pressure standard value P _s2 = 100 [kPa] corresponding to the drive current I ₂ = 1000 [mA].

(Step S8050) drive current calculation section 140 refers to the initial hydraulic pressure characteristic information HCI stored in the initial characteristic information storage unit 220, obtains the inspection time measuring pressure _{P c2} corresponding to the drive current _{I 2.} In the specific example of the present embodiment, as shown in FIG. 2, the measurement current pressure P _c2 = 200 [kPa] corresponds to the drive current I ₂ = 1000 [mA]. In the case of this specific example, the drive current calculation unit 140 acquires the test measurement pressure P _c2 = 200 [kPa] corresponding to the drive current I ₂ = 1000 [mA].

(Step S8060) drive current calculation section 140 calculates the lower limit oil pressure standard value _{P s2} obtained in step S8050, the pressure deviation [Delta] P ₂ and the inspection time measuring pressure _{P c2} obtained in step S8060. In this specific example, the drive current calculation unit 140 calculates the pressure deviation ΔP ₂ between the lower limit side hydraulic pressure standard value P _s2 = 100 [kPa] and the inspection measurement pressure P _c2 = 200 [kPa].
Here, the pressure deviation ΔP ₂ is a pressure difference between the lower limit side hydraulic standard value P _s and the inspection measurement pressure P _c at the pressure adjustment point. The pressure regulation point is a reference point when the drive current calculation unit 140 corrects the current value of the drive current I based on the drive current-hydraulic characteristic curve.
In the example illustrated in FIG. 6, the drive current calculation unit 140 includes the coordinates of the intersection point Q _s2 between the drive current I ₂ and the lower limit hydraulic pressure standard value P _s2, and the intersection point Q between the drive current I ₂ and the measurement pressure P _c2 during inspection. based on the _c2, and calculates the pressure deviation [Delta] P _2. In this case, the tone pressure point is a point of intersection _{Q c2.}
That is, the driving current calculation unit 140 in step S8060 from step S8040, and calculates the pressure deviation [Delta] P ₂ in regulating pressure point.

[(3) Correction of drive current I at the pressure adjustment point]
(Step S8070) drive current calculation section 140, the pressure difference [Delta] P ₂ calculated in step S8060 it is determined whether it is within the predetermined range ± d. Drive current calculation section 140, the pressure difference [Delta] P ₂ if it is determined to be within the predetermined range ± d; (step S8070 YES), the process proceeds to step S8090. Drive current calculation section 140, the pressure difference [Delta] P ₂ if it is determined that it is not within a predetermined range ± d; (step S8070 NO), the process proceeds to step S8080.

(Step S8080) drive current calculation section 140, a current value corresponding to the pressure difference [Delta] P ₂ calculated in step S8060, is corrected by adding the drive currents _{I 2.} Specifically, the drive current calculation unit 140 calculates an intersection Q _c3 between the lower limit hydraulic pressure standard value P _s2 and the drive current-hydraulic characteristic curve CC1. Drive current calculation section 140 calculates a driving current I _{2 +} [delta] at intersection point Q _c3 the calculated difference of the current value of the drive current I ₂ in the intersection Q _c2, i.e. [delta], as a current value corresponding to the pressure difference [Delta] P ₂ To do. The drive current calculation unit 140 calculates the drive current I ₂ + δ as the corrected drive current I by adding the current value δ corresponding to the calculated pressure deviation ΔP ₂ to the drive current I ₂ .

(Step S8090) The drive current calculation unit 140 acquires the lower limit side hydraulic standard information LL stored in the lower limit side hydraulic standard value storage unit 230, and based on the acquired lower limit side hydraulic standard information LL, the drive current minus the lower limit A slope ΔP ₀ of the side hydraulic pressure standard characteristic curve CC2 is calculated.

(Step S8100) drive current calculation section 140, a drive current is calculated in step S8090 - the difference between the slope [Delta] P ₀ for the lower limit hydraulic standard characteristic curve CC2, a deviation [Delta] P _c calculated in step S8030, i.e. slope difference ΔΔP ₀ is calculated.

(Step S8110) drive current calculation section 140, slope difference DerutaderutaP ₀ calculated in step S8100 it is determined whether it is within the predetermined range ± dd. If the drive current calculation unit 140 determines that the slope difference ΔΔP ₀ is within the predetermined range ± dd (step S8110; YES), the process ends. If the drive current calculation unit 140 determines that the slope difference ΔΔP ₀ is not within the predetermined range ± dd (step S8110; NO), the process proceeds to step S8120.

(Step S8120) drive current calculation section 140, a current value corresponding to the slope difference DerutaderutaP ₀ calculated in step S8060, it is corrected by adding the drive currents I. As a specific example, the drive current calculation section 140, the case of correcting the drive current I ₁ shown in FIG.

Drive current calculation section 140 calculates the drive current I ₁ as a pre-correction drive current I. If the driving current I ₁ is supplied to the solenoid valve V, the supply pressure of OIL supplying solenoid valve V is in the automatic transmission TM, the drive current - pressure corresponding to the driving current I ₁ in the hydraulic pressure characteristic curve CC1, i.e. It is the measurement pressure _Pc1 at the time of inspection.
Drive current calculation section 140, the drive current - with reference to the lower limit hydraulic standard characteristic curve CC2, and the driving current I _1, the driving current - by calculating the intersection point Q _s1 of the lower limit hydraulic pressure standard characteristic curve CC2, lower A side hydraulic pressure standard value P _s1 is calculated.

Next, the drive current calculation section 140, a lower limit hydraulic pressure standard value _{P s1,} driving current - by calculating the intersection point _{Q c1-2} the hydraulic characteristic curve CC1, calculates a drive current _{I 1-2.}
In other words, the drive current calculation unit 140 is based on the deviation ΔP ₁ between the test measurement pressure P _c1 when the drive current I ₁ is supplied to the solenoid valve V and the lower limit hydraulic standard value P _s1 of the drive current I _1. Te, and calculates the correction value [Delta] I ₁ of the driving current _{I 1.}

(Step S90) Returning to FIG. 4, the drive current calculation unit 140 calculates the drive current I based on the control target value TGT, the deviation DV, and the drive current-hydraulic characteristic table after correction to the variation data lower limit standard. A drive current value DC is calculated. Here, since the drive current calculation unit 140 calculates the drive current value DC based on the drive current-hydraulic characteristic table after correction to the variation data lower limit standard, the reduced target in which the target hydraulic pressure of the hydraulic oil OIL is reduced. A drive current value DC is calculated based on the hydraulic pressure. That is, the drive current calculation unit 140 calculates the drive current value DC based on the reduced target hydraulic pressure in which the target hydraulic pressure of the hydraulic oil OIL is reduced based on the deviation DV calculated by the deviation calculation unit 130.
The drive current calculation unit 140 outputs the calculated drive current value DC to the history information generation unit 110 and the drive current output unit 300.

  As described above, when the post-learning hydraulic characteristic information HCL has not been generated, that is, when the learning of the hydraulic characteristic of the solenoid valve V has not ended, the drive current calculation unit 140 is based on the deviation DV. The solenoid valve V controls the supply pressure of the hydraulic oil OIL supplied to the automatic transmission TM.

  In the prior art, when learning of the hydraulic characteristics of the solenoid valve V has not been completed, the supply pressure of the hydraulic oil OIL may be controlled based on the hydraulic characteristics of the lower limit standard product of the solenoid valve V. . In the prior art, when the control based on the hydraulic characteristics of the lower limit standard product of the electromagnetic valve V is performed, the hydraulic control considering the individual hydraulic characteristics of the electromagnetic valve V has not been performed. That is, in this prior art, when learning of the hydraulic characteristics of the solenoid valve V has not been completed, among the solenoid valves V having individual variations in the hydraulic characteristics, the solenoid valve V having the lowest hydraulic characteristics, that is, the standard In some cases, control was performed according to the hydraulic characteristics of the lower limit product. In this case, there is a problem that the supply pressure of the hydraulic oil OIL by the solenoid valve V that is not the standard lower limit product is higher than the supply pressure by the solenoid valve V of the standard lower limit product. For this reason, according to the prior art, when the learning of the hydraulic characteristics of the solenoid valve V has not been completed, the supply pressure becomes relatively high depending on the individual solenoid valve V, and it is impossible to suppress a reduction in fuel consumption of the vehicle. There was a problem.

  When the learning of the hydraulic characteristics of the solenoid valve V has not been completed, the hydraulic control apparatus 10 according to the present embodiment determines the hydraulic oil OIL based on the initial hydraulic characteristic information HCI acquired for each individual solenoid valve V. Since the supply pressure is controlled, the supply pressure can be reduced to a lower limit pressure corresponding to the characteristics of the individual solenoid valve V. That is, according to 10 of the present embodiment, when the learning of the hydraulic characteristics of the solenoid valve V has not ended, it is possible to suppress a reduction in fuel consumption of the vehicle.

Further, the drive current calculation unit 140 corrects the drive current I ₁ based on the lower limit side hydraulic standard value P _s1 stored in the lower limit side hydraulic standard value storage unit 230. The lower limit hydraulic pressure standard value P _s1 is lower than the measured pressure P _c1 at the time of inspection. That is, the driving current calculation unit 140, by correcting the driving current I _1, the solenoid valve V is to reduce the supply pressure of the hydraulic oil OIL supplied to the automatic transmission TM.

  In addition, each embodiment described above and its modification examples can be combined as appropriate within a range that does not contradict each other.

  Each of the above devices has a computer inside. The process of each device described above is stored in a computer-readable recording medium in the form of a program, and the above-described processing is performed by the computer reading and executing the program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

The program may be for realizing a part of the functions described above.
Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

  DESCRIPTION OF SYMBOLS 10 ... Hydraulic control apparatus, 20 ... High-order unit, 30 ... Hydraulic supply part, 100 ... Operation part, 110 ... History information generation part, 120 ... Characteristic information generation part, 130 ... Deviation calculation part, 140 ... Drive current calculation part, 200 DESCRIPTION OF SYMBOLS ... Storage unit 210 ... History storage unit 220 ... Initial characteristic information storage unit 230 ... Lower limit side hydraulic pressure standard value storage unit 300 ... Drive current output unit P ... Oil pump, OP ... Oil pan, HP ... Hydraulic oil piping , V ... Solenoid valve, SL ... Solenoid, OIL ... Hydraulic oil, TM ... Automatic transmission, PS ... Hydraulic pressure sensor

Claims (5)

A hydraulic control device for controlling a hydraulic pressure of hydraulic oil supplied to the automatic transmission via the electromagnetic valve by controlling a driving current of the electromagnetic valve;
Based on the output of a hydraulic pressure sensor that measures the hydraulic pressure of the hydraulic oil, history information indicating the correspondence between the drive current of the solenoid valve and the hydraulic pressure of the hydraulic oil generated by the solenoid valve to which the drive current is supplied is stored. A history storage unit,
An initial characteristic information storage unit that stores hydraulic characteristic measured for each electromagnetic valve in the initial use state of the electromagnetic valve as initial characteristic information;
A lower limit side hydraulic standard value storage unit that stores a lower limit side hydraulic standard value indicating a lower limit value of the hydraulic pressure of the hydraulic oil supplied to the automatic transmission;
When the history information stored in the history storage unit satisfies a predetermined condition, a hydraulic pressure indicating a correspondence between a driving current of the solenoid valve and a hydraulic pressure of the hydraulic oil generated by the solenoid valve to which the driving current is supplied A characteristic information generating unit that generates characteristic information based on the history information stored in the history storage unit;
Based on the initial characteristic information stored in the initial characteristic information storage unit and the lower limit hydraulic standard value of the automatic transmission stored in the lower limit hydraulic standard value storage unit, the hydraulic pressure indicated by the initial characteristic information A deviation calculating unit for calculating a deviation from the lower limit hydraulic pressure standard value;
A drive current calculation unit for calculating the drive current;
With
The drive current calculator is
When the hydraulic characteristic information is generated by the characteristic information generation unit, the drive current is calculated based on the hydraulic characteristic information, and when the hydraulic characteristic information is not generated by the characteristic information generation unit, the deviation is calculated. A hydraulic control device that calculates the drive current based on the deviation calculated by the unit. The characteristic information generation unit
The hydraulic control device according to claim 1, wherein the hydraulic characteristic information is generated when a predetermined amount of the history information is stored in the history storage unit. The characteristic information generation unit
The hydraulic pressure characteristic information is generated when a deviation between a control target value of hydraulic pressure and a hydraulic pressure indicated by the history information stored in the history storage unit is equal to or less than a predetermined value. Hydraulic control device. The drive current calculator is
4. The drive current is calculated based on a post-reduction target hydraulic pressure in which a target hydraulic pressure of the hydraulic oil is reduced based on the deviation calculated by the deviation calculation unit. 5. Hydraulic control device. An apparatus for controlling the hydraulic pressure of hydraulic oil supplied to the automatic transmission via the electromagnetic valve by controlling the drive current of the electromagnetic valve, based on the output of a hydraulic sensor that measures the hydraulic pressure of the hydraulic oil A history storage unit storing history information indicating correspondence between the drive current of the solenoid valve and the hydraulic pressure of the hydraulic oil generated by the solenoid valve to which the drive current is supplied; and an initial use state of the solenoid valve In the computer provided in the hydraulic control device including the initial characteristic information storage unit in which the hydraulic characteristic measured for each electromagnetic valve is stored as initial characteristic information,
When the history information stored in the history storage unit satisfies a predetermined condition, based on the history information stored in the history storage unit, the drive current of the solenoid valve and the drive current supplied A characteristic information generating step for generating hydraulic characteristic information indicating a correspondence with the hydraulic pressure of the hydraulic oil generated by the electromagnetic valve;
A deviation calculating step for calculating a deviation between the hydraulic pressure indicated by the initial characteristic information and the lower limit hydraulic pressure standard value based on the initial characteristic information and the lower limit hydraulic pressure standard value of the automatic transmission;
A first drive current calculation step for calculating the drive current based on the hydraulic pressure characteristic information when the hydraulic pressure characteristic information is generated in the characteristic information generation step;
A second driving current calculating step for calculating the driving current based on the deviation calculated in the deviation calculating step when the hydraulic characteristic information is not generated in the characteristic information generating step;
A program for running

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