JP2008249009A - Control circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control circuit for a hydraulic control apparatus which keeps heat evenly developed in the control circuit for controlling a hydraulic control means. <P>SOLUTION: The control circuit for a hydraulic control apparatus includes a plurality of hydraulic-pressure receiving parts for receiving signals issued from a plurality of hydraulic pressure detectors and obtaining the detected hydraulic pressures, a plurality of hydraulic pressure-controller-driving-parts which supply driving current respectively to a first and a plurality of second hydraulic pressure controllers to control the first and the plurality of second hydraulic pressure controllers, and an operation part for determining the driving current which is to be supplied by the pressure-controller-driving-parts to the first and the plurality of second hydraulic pressure controllers. The operation part calculates a plurality of corrections, that is, differences between command variables of hydraulic pressure to be supplied a plurality of engagement members and detected hydraulic pressure supplied from the plurality of hydraulic-pressure receiving parts. If one or more corrections exceed a specified range, the driving current to the plurality of second hydraulic pressure controllers is increased/decreased by a prescribed rate, and the driving current to the first hydraulic pressure controller is decreased/increased by a prescribed rate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a control circuit that controls a hydraulic control device used in an automatic transmission of a vehicle, and more particularly to a control circuit that controls a hydraulic control device that performs hydraulic control using hydraulic control means connected in series.

  A hydraulic control device used in an automatic transmission of a vehicle engages an engagement member by supplying hydraulic oil to the engagement member such as a clutch. The engaging member that has been supplied with the hydraulic oil is engaged when the hydraulic pressure of the hydraulic oil exceeds a predetermined value, and is released when the hydraulic pressure falls below the predetermined value. Such a hydraulic control circuit is disclosed in Patent Document 1. Patent Document 1 discloses a technique for forming a gear stage by supplying hydraulic oil to a plurality of engaging members and engaging predetermined engaging members.

  FIG. 1 is a diagram showing a vehicle equipped with a hydraulic control device. The vehicle in FIG. 1 represents a front wheel drive vehicle, but may be a vehicle other than the front wheel drive vehicle. The vehicle in FIG. 1 includes an engine 30, a transmission 20, a front wheel 40, and an ECU (Electronic Control Unit) 50. The transmission 20 has a hydraulic control device 10 inside.

  The engine 30 is an internal combustion engine that burns a mixed gas of fuel and air inside a cylinder. The piston in the cylinder is pushed down by combustion, and the crankshaft rotates. The transmission 20 forms a desired gear stage and changes the rotation speed of the crankshaft.

  The ECU 50 receives signals from the vehicle speed sensor 80, the shift lever 60, the accelerator pedal 70, and the brake pedal 71. The vehicle speed sensor 80 detects the speed of the vehicle and transmits it to the ECU 50. The position of the shift lever 60 is transmitted to the ECU 50, and the gear stage of the transmission 20 is automatically formed accordingly. The ECU 50 receives the opening of the accelerator pedal 70 from the accelerator pedal 70. The ECU 50 receives signals from the vehicle speed sensor 80, the shift lever 60, the accelerator pedal 70, the brake pedal 71, and the like, and controls the running state of the vehicle based on the received information.

  Here, the hydraulic control device 10 included in the transmission 20 will be described.

  FIG. 2 is a schematic diagram of a configuration of a conventional hydraulic control device. The conventional hydraulic control device includes a control circuit 400, a pump 401, engaging members 402 and 403, solenoid valves 404 to 406, pressure sensors 407 and 408, and oil passages 409 to 412. The control circuit 400 includes a CPU (Central Processing Unit) 431, a RAM (Random Access Memory) 432, a ROM (Read Only Memory) 433, hydraulic pressure receiving units 441 and 442, and solenoid driving units 421 to 423. Yes. The CPU 431 is connected to the ROM 433 and the RAM 432 by a bus or the like. When the power is turned on, the program stored in the ROM 433 is expanded on the RAM 432. The CPU 431 controls the control circuit 400 and the hydraulic control device based on the program. In addition, the CPU 431 receives signals from the pressure sensors 407 and 408 via the hydraulic pressure receiving units 441 and 442, and instructs the solenoid driving units 421 to 423 to output a driving current.

  The pump 401 supplies hydraulic oil to the solenoid valve 404 via the oil passage 412. The solenoid valve 404 adjusts the flow rate of the hydraulic oil supplied from the pump 401 based on the drive current from the solenoid drive unit 421 in the control circuit 400, and adjusts the base pressure, which is the hydraulic pressure in the oil passage 409. The hydraulic oil adjusted to the base pressure is supplied to the solenoid valves 405 and 406 via the oil passage 409.

  Solenoid valves 405 and 406 are provided for adjusting the working pressure, which is the hydraulic pressure of the hydraulic oil supplied to the clutch C1-402 and the clutch C2-403, which are engaging members. In response to the drive current from the solenoid drive units 422 and 423 in the control circuit 400, the solenoid valves 405 and 406 further adjust the base pressure supplied to the oil passage 409. By this adjustment, a predetermined working pressure is supplied to the clutches C1-402 and the clutch C2-403 that are engaging members. The clutch C1-402 and the clutch C2-403 supplied with a predetermined working pressure constitute a desired gear stage by a combination thereof.

  Here, the clutch C1-402 and the clutch C2-403, which are engaging members, will be described.

FIG. 3 is a configuration diagram of the clutch C1-402 and the clutch C2-403, which are engaging members. The clutch, which is an engaging member, is formed in a ring shape around a rotating shaft 505 that transmits power from the engine 30. The hydraulic fluid supplied from the oil passage 410 or 411 flows into the oil chamber 501,
Push piston 504. The clutch plates 503 and the clutch disks 504 pressed by the piston 504 are alternately overlapped, and are rubbed and engaged by the compression of the piston 504. In this way, power from the engine 30 is transmitted.

  A mechanism in which the gear stage is formed by engaging the clutch C1-402 and the clutch C2-403 will be described.

  FIG. 4 is a diagram illustrating the formation of a gear stage in the automatic transmission. The gear stage in the automatic transmission of FIG. 4 includes a sun gear 601, planet gears 602 to 604, and a ring gear. The sun gear 601 and the planet gears 602 to 604 are gears having a radius R, and the planet gears 602 to 604 are in contact with the periphery of the sun gear 601. The intervals between the three planet gears 602 to 604 are fixed, and are in contact with the ring gear 605 having a radius of 3R. As the three planet gears 602 to 604 rotate, the power of the engine 30 is transmitted to the front wheels 40 via the shaft.

  FIG. 4a shows the gear stage when the clutch C1-402 is engaged. When the clutch C1-402 is engaged, the power of the engine 30 is transmitted to the sun gear 601. At this time, the ring gear 605 is fixed. When the power of the engine 30 is transmitted, the sun gear 601 rotates, and the planet gears 602 to 604 rotate accordingly. As the planet gears 602 to 604 rotate, the planet gears 602 to 604 rotate around the center of the sun gear 601. Here, with respect to one rotation of the sun gear 601, the planet gear 602 rotates from the position Q1 to Q2. Similarly, the other planet gears also rotate around the center of the sun gear 601. The rotational movement of the planet gears 602 to 604 is transmitted to the front wheel 40 through the shaft.

  FIG. 4b shows the gear stage when the clutch C2-403 is engaged. When the clutch C2-403 is engaged, the power of the engine 30 is transmitted to the ring gear 605. At this time, the sun gear 601 is fixed. When the power of the engine 30 is transmitted, the ring gear 605 rotates, and the planet gears 602 to 604 rotate accordingly. As the planet gears 602 to 604 rotate, the planet gears 602 to 604 rotate around the center of the sun gear 601. Here, the ring gear 605 rotates in the direction DX1, and the planet gears 602 to 604 rotate and move in the direction DX2. Then, for one rotation of the ring gear 605, the planet gears 602 to 604 perform rotational movement for three rotations around the center of the sun gear 601. The rotation of this rotational movement is transmitted to the front wheel 40 via the shaft. Thus, the gear stage of the automatic transmission is formed by the engagement of the clutch C1-402 and the clutch C2-403.

  In addition to the engaging member, the solenoid valve in FIG. 2 will also be described.

  FIG. 5 is a configuration diagram of a solenoid valve used in the hydraulic control device. The solenoid valves 404 to 406 are constituted by a drive solenoid 701, a push rod 702, a movable core 703, an operation rod 704, a spring portion 708, and a ball valve 709. The drive solenoid 701 has a fixed core having a hole in the center and a coil wound around the fixed core, and generates a magnetic field in response to the supply of the drive current I from the outside. The movable core 703 fixed to the push rod 702 moves to the left and right according to the magnetic field generated by the drive solenoid 701. A push rod 702 that moves to the left and right along with the movable core 703 pushes the operation rod 704 for adjusting the ball valve 709 from the right side. The spring portion 708 adjusts the ball valve by pushing the ball valve 709 from the left side. The adjusted ball valve 709 adjusts the hydraulic pressure of the hydraulic oil flowing in from the inlet 705 and the hydraulic pressure of the hydraulic oil flowing out of the outlet 706 according to the drive current I supplied from the outside. The hydraulic oil is discharged from the discharge port 707 as the hydraulic pressure is adjusted.

  In such a hydraulic control device, the control circuit 400 performs the following control.

  FIG. 6 is an operation flowchart in the conventional hydraulic control apparatus. The control circuit 400 of the conventional hydraulic control device controls the solenoid valves 404 to 406 according to the operation flowchart of FIG. The operation flowchart of FIG. 6 is executed alternately for the solenoid valves 405 and 406.

  When the control is started, the control circuit 400 sets an instruction value that is a current value of the drive current (step T1). In step T1, the command value supplied to the solenoid valve 405 or 406 is calculated based on the target pressure, and the command value is updated and set by adding a correction value. This correction value complements aging deterioration of the hydraulic control device, temperature change of the hydraulic oil, individual differences in the shape of the parts used, and the like. The initial value of the correction value is zero, but is adjusted in steps T6 and T7 of this operation flowchart. Here, the instruction value is set using the correction value obtained in the previous execution of the operation flowchart.

  The indicated value is the current value of the drive current supplied from the solenoid drive unit 421 or 422 to the solenoid valve 405 or 406. The solenoid valve 405 or 406 adjusts the hydraulic pressure supplied according to the indicated value. The change amount and the change amount of the supplied hydraulic pressure are in a proportional relationship. Also, the three solenoid valves 404 to 406 used here are of the same type, and the amount of change in hydraulic pressure due to the change in the indicated value is the same in any solenoid valve. Hereinafter, the operation flowchart will be described assuming that the solenoid valve 405 is controlled.

  The set instruction value is supplied as a drive current to the solenoid valve 405 via the solenoid drive unit 422 (step T2). Based on the instruction value supplied to the solenoid valve 405, the solenoid valve 405 adjusts the hydraulic pressure. Note that the instruction value supplied to the solenoid valve 405 in step T2 is kept constant until the instruction value is changed in step T2 in the execution of the next operation flowchart.

  After the hydraulic pressure is adjusted by the solenoid valve 405, the hydraulic pressure of the oil passage 410 is detected (step T3). The pressure sensor 407 detects the working pressure acting on the clutch C1-402 as an engaging member, and the control circuit 400 receives the detected value of the working pressure from the pressure sensor 407 via the hydraulic pressure receiver 441.

  Thereafter, the control circuit 400 compares the working pressure actually acting on the clutch C1-402 that is the engaging member with the target pressure that is the target value of the working pressure (steps T4 and T5). If the working pressure is lower than the target pressure, the process proceeds to step T6. If the working pressure is higher than the target pressure, the process proceeds to step T7. Then, when the working pressure and the target pressure are equal, the operation flowchart ends.

  If the working pressure is lower than the target pressure, the correction value of the indicated value is increased (step T6). If the working pressure is higher than the target pressure, the target pressure correction value is decreased (step T7). After the correction value is changed in steps T6 and T7, the operation flowchart ends. This flowchart is executed alternately for the solenoid valves 405 and 406 during the operation of the hydraulic control circuit.

Thus, in the conventional hydraulic control apparatus, the working pressure actually supplied to the clutch C1-402 and the clutch C2-403, which are the engaging members, is the shape of the parts used for the oil passage and the engaging member. An error is caused by individual differences, which is different from the ideal working pressure. Similar errors are also caused by aging of components and temperature changes of hydraulic oil. With respect to such an error, in the conventional technique, pressure sensors 407 and 408 are provided to detect the actual working pressure acting on the engaging member, and the solenoid valves 405 and 406 are corrected based on the detection result. It was.
JP 2005-282592 A

  However, when such control is performed, only the working pressure in the oil passages 410 and 411 provided with the pressure sensors 407 and 408 can be detected. Therefore, in order to control the working pressure in the oil passages 410 and 411 even when there is a problem in the control of the solenoid valve 404, the solenoid valves 405 and 406 are frequently controlled to control the solenoid valves 410 and 411. Heat generation is biased and causes damage. When such damage is caused, an abnormality occurs in the control circuit, and the damage spreads to the components of the transmission to be controlled.

  While both the base pressure adjustment solenoid valve and the working pressure adjustment solenoid valve can be corrected, the correction is performed using only the working pressure adjustment solenoid valve. It cannot be used.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a control circuit for a hydraulic control device that does not bias the heat generation in a portion that controls a solenoid valve that is a hydraulic control means, without newly adding hydraulic pressure detection means such as a pressure sensor. There is to do.

  A further object of the present invention is to make effective use of the correction ranges of both the base pressure adjusting solenoid valve and the working pressure adjusting solenoid valve without newly adding a hydraulic pressure detecting means such as a pressure sensor. Another object of the present invention is to provide a control circuit for a hydraulic control device.

  In order to solve the above-described problems, a control circuit according to a first aspect of the present invention includes a hydraulic pressure generating unit that supplies hydraulic oil to a first oil passage, and a hydraulic pressure supply unit that supplies the hydraulic oil through the first oil passage. First hydraulic pressure adjusting means for adjusting the hydraulic pressure of the hydraulic oil to be supplied and supplying it to the branched second oil passage, and the hydraulic oil supplied from the first hydraulic pressure adjusting means via the second oil passage And a plurality of second hydraulic pressure adjusting means for supplying the hydraulic pressure to one of the plurality of third oil passages, and the plurality of second hydraulic pressure adjusting means. A plurality of engagement members that are engaged when the hydraulic pressure of the hydraulic oil supplied from the second hydraulic pressure adjusting means via the third oil passage is equal to or higher than a predetermined value and released when the hydraulic pressure is lower than the predetermined value; And a plurality of oil pressure detecting means for detecting the oil pressure of the third oil passage. A control circuit for controlling the control device, which receives signals from a plurality of oil pressure detecting means and obtains detected oil pressure; and the first and the plurality of second oil pressure adjustments According to the detected hydraulic pressure obtained by the plurality of hydraulic pressure adjusting means driving units for supplying the driving current to each of the means and controlling the first and the plurality of second hydraulic pressure adjusting units, and the plurality of hydraulic pressure receiving units. Thus, the plurality of hydraulic pressure adjusting means driving sections have a calculation section for determining a driving current supplied to the first and the plurality of second hydraulic pressure adjusting means.

  Then, the calculation unit calculates a plurality of correction values that are differences between a target value of the hydraulic pressure supplied to each of the plurality of engaging members and a detected hydraulic pressure corresponding to each of the plurality of engaging members for a predetermined time. When at least one of the plurality of correction values corresponding to the plurality of second hydraulic pressure adjusting means exceeds a predetermined range, the drive current to the plurality of second hydraulic pressure adjusting means is calculated by a predetermined amount. The drive current to the first hydraulic pressure adjusting means is increased or decreased to decrease or increase by the predetermined amount.

  The control circuit according to the second aspect of the present invention comprises a hydraulic pressure generating means for supplying hydraulic oil to the first oil passage, and a hydraulic oil supply from the hydraulic pressure generating means via the first oil passage. The hydraulic pressure is adjusted in accordance with the supplied drive current and supplied to the second oil passage, and is supplied from the first hydraulic pressure adjustment means via the second oil passage. A plurality of second hydraulic pressure adjusting means for adjusting hydraulic pressure of the hydraulic oil according to a supplied drive current and supplying the hydraulic oil to a third oil passage provided corresponding to each of the second hydraulic pressure adjusting means; Engage when the hydraulic pressure of the hydraulic oil provided corresponding to each of the hydraulic oil supplied from the second hydraulic pressure adjusting means via the third oil passage is equal to or higher than a predetermined value, and released when the hydraulic oil pressure is lower than the predetermined value A plurality of engagement members forming one gear stage by a combination of engagement and release; It is installed in each of the road, and a plurality of hydraulic sensing means for sensing said third oil passage pressure that corresponds to the engaging member.

  A plurality of oil pressure receiving portions provided corresponding to each of the oil pressure detecting means, receiving a signal from the oil pressure detecting means, and obtaining a detected oil pressure; and the first and the plurality of the second A plurality of hydraulic pressure adjusting means driving units for supplying a drive current to the first and the second hydraulic pressure adjusting means to control the hydraulic pressure, and for receiving the hydraulic pressure; A calculation unit that determines a drive current that the hydraulic pressure adjusting unit driving unit supplies to the first and the plurality of second hydraulic pressure adjusting units according to the detected hydraulic pressure acquired by the unit. Calculates a plurality of correction values, which are differences between a target value of the hydraulic pressure supplied to each of the plurality of engaging members and a detected hydraulic pressure corresponding to each of the plurality of engaging members, a predetermined number of times at a predetermined time. The plurality of corrections corresponding to the plurality of second hydraulic pressure adjusting means When the difference between at least one increase number and decrease number exceeds a predetermined number, the drive current to the plurality of second hydraulic pressure adjusting means is increased or decreased by a predetermined amount to drive the first hydraulic pressure adjusting means. The current is decreased or increased by the predetermined amount.

  In the above aspect, as a preferred mode, the calculation unit may be configured such that when at least one of the plurality of correction values corresponding to the plurality of second hydraulic pressure adjusting means continuously increases or decreases a predetermined number of times, the plurality of second second values. The drive current to the hydraulic pressure adjusting means is increased or decreased by a predetermined amount, and the drive current to the first hydraulic pressure adjusting means is decreased or increased by the predetermined amount.

  Furthermore, a third aspect of the present invention is a hydraulic circuit in which a plurality of control valves are provided in an oil passage provided between an oil supply source and a drive unit that is driven by hydraulic oil from the oil supply source. A feedback control means for performing control while correcting so that a control value for controlling an opening degree of at least one control valve in the plurality of control valves approaches an indicated value; When it is determined that the state in which the correction value in the feedback control means is a predetermined amount or more in the same valve drive direction is constantly occurring, at least a part of the correction amount in the feedback means is used as the plurality of controls. The feedback means in the valve has correction amount distribution means for distributing the correction amount for controlling the control valve different from the control valve for controlling.

  The control circuit in the hydraulic control device of the present invention adds a hydraulic pressure detection means such as a pressure sensor by correcting both the hydraulic pressure control means for controlling the base pressure and the hydraulic pressure control means for controlling the working pressure. Without any bias in the heat generation in the control circuit for controlling the hydraulic control means.

  The control circuit in the hydraulic control device according to the present invention adds a hydraulic pressure detecting means such as a pressure sensor by correcting both the hydraulic pressure controlling means for controlling the base pressure and the hydraulic pressure controlling means for controlling the working pressure. Without this, the correction ranges of both the hydraulic pressure control means for adjusting the base pressure and for adjusting the working pressure can be used effectively.

  Embodiments of the present invention will be described below with reference to the drawings. However, the technical scope of the present invention is not limited to these embodiments, but extends to the matters described in the claims and equivalents thereof.

  FIG. 7 is a configuration diagram of a hydraulic control device to be controlled in the present invention. In FIG. 7, only the portions necessary for the present invention are shown. Here, the hydraulic control apparatus to be controlled according to the present invention includes a pump P1, solenoid valves LS-203 to LS-205, engagement members 108 and 109, pressure sensors PS1 and PS2, and a control circuit 300. The control circuit 300 includes a CPU (Central Processing Unit) 331, a RAM (Random Access Memory) 332, a ROM (Read Only Memory) 333, and solenoid drive units 321 to 323. The CPU 331 is connected to the ROM 333 and RAM 332 by a bus or the like. When the power is turned on, the program stored in the ROM 333 is expanded on the RAM 332. The CPU 331 controls the control circuit 300 and the hydraulic control device based on the program. The CPU 331 receives signals from the pressure sensors PS1 and PS2 via the hydraulic pressure receiving units 341 and 342, and instructs the solenoid driving units 321 to 323 to output a driving current.

  Solenoid valve LS-203 adjusts the hydraulic pressure supplied from pump P1 by the drive current from solenoid drive unit 321 in control circuit 300, and controls the base pressure, which is the hydraulic pressure of oil passage OL-20. The base pressure of the oil passage OL-20 is supplied to the solenoid valves LS-204 and LS-205. Solenoid valves LS-204 and LS-205 adjust the supplied base pressure based on the drive current from solenoid drive units 322 and 323 in control circuit 300, and supply the adjusted hydraulic pressure to oil path OL-30, respectively. And supply for OL-40. The oil pressures of the oil passages OL-30 and OL-40 are supplied to the clutches C1-108 and C2-109, which are engaging members. When a hydraulic pressure lower than the pressure is supplied, the release state is established.

  The oil pressure in the oil passages OL-30 and OL-40 is monitored by pressure sensors PS1 and PS2. The pressure sensors PS1 and PS2 monitor the oil pressure of the oil passages OL-30 and OL-40 and supply the detected oil pressure to the control circuit 300. The control circuit 300 controls the solenoid valves LS-203 to LS-205 based on the supplied hydraulic pressure. Part of the hydraulic fluid that passes through the solenoid valves LS-203, LS-204, and LS-205 is discharged and returns to the pump P1.

  FIG. 8 is an operation flowchart of the control circuit of the hydraulic control device according to the present invention. When the power is turned on, the control circuit 300 of the hydraulic control device according to the present invention develops the program stored in the ROM 333 on the RAM 332. The CPU 331 executes an operation flowchart based on the program to control the control circuit 300 and the hydraulic control device. The control circuit 300 controls the solenoid valves LS-203 to LS-205 via the solenoid driving units 321 to 323 according to the operation flowchart of FIG. The operation flowchart of FIG. 8 is executed alternately for the solenoid valves LS-204 and LS-205.

  When the control is started, the control circuit 300 sets an instruction value that is a current value of the drive current (step S1). In step S1, the command value supplied to the solenoid valve LS-204 or LS-205 is calculated based on the target pressure, and the correction value is added to the command value to be updated and set. This correction value complements aging deterioration of the hydraulic control device, temperature change of the hydraulic oil, individual differences in the shape of the parts used, and the like. The initial value of the correction value is zero, but is adjusted in steps S6, S7, and S9 of this operation flowchart. Here, the instruction value is set using the correction value obtained in the previous execution of the operation flowchart.

  The command value is the current value of the drive current supplied from the solenoid drive unit to the solenoid valve. The solenoid valve adjusts the hydraulic pressure supplied according to the command value. Are proportional. Also, the three solenoid valves LS-203 to LS-205 used here are of the same type, and the amount of change in hydraulic pressure due to the change in the indicated value is the same for any solenoid valve. Hereinafter, the operation flowchart will be described assuming that the solenoid valve LS-204 is being controlled.

  Thereafter, the instruction value set in step S1 is supplied as a drive current to solenoid valve LS-204 via solenoid drive unit 322 (step S2). Based on the indicated value supplied to the solenoid valve LS-204, the solenoid valve LS-204 adjusts the hydraulic pressure. Note that the instruction value supplied to the solenoid valve LS-204 in step S2 is kept constant until the instruction value is changed in step S2 in the execution of the next operation flowchart.

  After the hydraulic pressure is adjusted by the solenoid valve LS-204, the hydraulic pressure of the oil passage OL-30 is detected (step S3). The pressure sensor PS1 detects the working pressure acting on the clutch C1-108 as the engaging member, and the control circuit 300 receives the detected value of the working pressure from the pressure sensor PS1 via the hydraulic pressure receiving unit 341.

  Thereafter, the control circuit 300 compares the working pressure actually acting on the clutch C1-108, which is an engaging member, with the target pressure that is the target value of the working pressure (steps S4 and S5). If the working pressure is lower than the target pressure, the process proceeds to step S6. If the working pressure is higher than the target pressure, the process proceeds to step S7. If the working pressure is equal to the target pressure, the operation flowchart ends.

  If the working pressure is lower than the target pressure, the correction value of the indicated value is increased by a predetermined amount (step S6). When the working pressure is higher than the target pressure, the target pressure correction value is decreased by a predetermined amount (step S7).

  After steps S6 and S7, it is confirmed whether or not the correction value recalculation condition is satisfied (step S8). The condition for recalculating the correction value is, for example, that the correction value updated in step S6 or S7 exceeds a predetermined range. In step S6 and S7, the correction value is changed, and if the changed correction value is outside the predetermined range, the correction value is recalculated (step S9). At this time, the correction value range is such that the control circuit 300 holds the priority for the solenoid valves LS-204 and LS-205 in the ROM 333 and sets a narrow correction value range for the solenoid valve with a high priority. Also good.

  It should be noted that the condition in step S8 can be established only when the correction value exceeds a predetermined range in both solenoid valves LS-204 and LS-205.

  Also, the number of correction value changes due to repeated execution of the operation flowchart is stored, and if the increase count exceeds the decrease count by a predetermined count, or if the decrease count exceeds the increase count by a predetermined count, step S8 It is also possible that the condition in is satisfied. In this case, the control circuit 300 secures an area for storing the number of changes of the correction value in the RAM 332, and sets the initial value to zero. The control circuit 300 increments this value every time step S6 is executed. This value is decremented every time step S7 is executed. If this value exceeds the predetermined range, it is assumed that the condition of step S8 is satisfied, and the recalculation of the correction value is performed in step S9. For example, when the predetermined range is −10 to +10, recalculation is performed when the difference between the increase count and the decrease count exceeds 10. When the condition is satisfied and recalculation is performed, the value of the area secured in the RAM 332 is reset to the initial value zero. The control circuit 300 holds the priority for the solenoid valves LS-204 and LS-205 in the ROM 333 and sets a small predetermined range for the solenoid valve with a high priority. Also good.

  It should be noted that the condition in step S8 can be satisfied only when the difference in the number of correction value corrections exceeds a predetermined range in both solenoid valves LS-204 and LS-205.

  Further, the number of consecutive correction values in the same direction can be set as the condition in step S8. In this case, the control circuit 300 holds the number of consecutive corrections in the same direction of the correction values for the solenoid valves LS-204 and LS-205 in the RAM 332. For example, when the correction value of the solenoid valve LS-204 is corrected in the decreasing direction in step S7, −1 is stored in the RAM 332 in the control circuit 300. When the next correction to the correction value of the solenoid valve LS-204 is in the decreasing direction again, -2 is stored. Furthermore, when the correction in the decreasing direction is repeated, it changes to -3 and -4. Thereafter, the value becomes 1 when correction in the increasing direction is performed. When the correction in the increasing direction is repeated, it changes to +2 and +3. If this value exceeds the predetermined range, the condition in step S8 is assumed to be satisfied, and the correction value is recalculated. For example, when the predetermined range is −10 to +10, the condition is satisfied when this value becomes +11 or when it becomes −11. The control circuit 300 may hold the priority for the solenoid valves LS-204 and LS-205 in the ROM 333 and set a narrow range for the solenoid valve having a high priority.

  Note that the condition in step S8 can be satisfied only when the number of consecutive correction values in the same direction exceeds the specified number of times for both solenoid valves LS-204 and LS-205. It is.

  Next, the correction value recalculation in step S9 will be described. FIG. 9 is used to explain the recalculation of the correction value in step S9.

  FIG. 9 is a graph showing the correction values of the solenoid valves LS-204 and LS-205 and the indicated value of the solenoid valve LS-203. Before recalculation of the correction value in step S9, as shown in FIG. 9a, the correction value of the solenoid valve LS-204 is the correction value B204, and the correction value of the solenoid valve LS-205 is the correction value B205. is there. The correction value B204 reaches the upper limit value LU204 of the correction value of the solenoid valve LS-204. LD205 is a lower limit value of the correction value of the solenoid valve LS-205.

  Since the correction value B204 has reached the upper limit value LU204, the correction value is recalculated in step S9. Before the correction value is recalculated, the drive current corresponding to the instruction value B203 is transmitted from the control circuit 300 to the solenoid valve LS-203.

  Then, by recalculating the correction value in step S10, the instruction value for the solenoid valve LS-203 increases from the instruction value B203 to the instruction value A203 as shown in FIG. 9b. At the same time, the correction value of the solenoid valve LS-204 is changed from the correction value B204 to the correction value A204, and the correction value of the solenoid valve LS-205 is changed from the correction value B205 to the correction value A205.

  Since the correction value B204 of the solenoid valve LS-204 has reached the upper limit value, in order to reduce this, the control circuit 300 increases the indicated value of the solenoid valve LS-203 by the change amount D203, and corrects the correction value B204 and the correction value B205. Is reduced by the change amount D203. At this time, the change amount D203 is determined as follows.

  Since the correction value B204 of the solenoid valve LS-204 does not have a margin to be corrected upward, the indicated value of the solenoid valve LS-203 and the solenoid valve are used by using the margin for correction below the correction value B205 of the solenoid valve LS-205. Change the correction value of LS-204. First, the control circuit 300 obtains D205 which is the difference between the correction value B205 of the solenoid valve LS-205 and its lower limit value LD-205. Here, the difference D205 is represented by the length from the correction value B205 to the lower limit value LD-205 in FIG. 9a. Then, a value obtained by dividing the difference D205 by 2 is set as a change amount D203, which is added to the indicated value B203 of the solenoid valve LS-203. In this way, the control circuit 300 obtains the new indicated value A203 of the solenoid valve LS-203. Accordingly, the control circuit 300 subtracts the change amount D203 from the correction values B204 and B205 of the solenoid valves LS-204 and LS-205. Then, new correction values A204 and A205 of the solenoid valves LS-204 and LS-205 are obtained. The indicated value of the solenoid valve LS-203 is updated and simultaneously supplied to the solenoid valve LS-204 via the solenoid drive unit 321.

 So far, the case where the correction value of solenoid valves LS-204 and LS-205 takes both positive and negative values has been explained, but after that, the correction value is biased to either positive or negative The recalculation of the correction value will be described.

  FIG. 10 is a graph showing the correction values of the solenoid valves LS-204 and LS-205 and the indicated value of the solenoid valve LS-203. Before recalculation of the correction value in step S9, as shown in FIG. 10a, the correction value of the solenoid valve LS-204 is the correction value b204, and the correction value of the solenoid valve LS-205 is the correction value b205. is there. The correction value b204 reaches the upper limit value lu204 of the correction value of the solenoid valve LS-204. Further, lu205 is an upper limit value of the correction value of the solenoid valve LS-205, and ld205 is a lower limit value.

  Since the correction value b204 has reached the upper limit value, the correction value is recalculated in step S9. Before the correction value is recalculated, the instruction value b203 is transmitted from the control circuit 300 to the solenoid valve LS-203.

  Then, by recalculating the correction value in step S9, the instruction value for the solenoid valve LS-203 increases from the instruction value b203 to the instruction value a203 as shown in FIG. 10b. At the same time, the correction value of the solenoid valve LS-204 is changed from the correction value b204 to the correction value a204, and the correction value of the solenoid valve LS-205 is changed from the correction value b205 to the correction value a205.

  Since the correction value b204 of the solenoid valve LS-204 has reached the upper limit value lu204, the control circuit 300 increases the indicated value of the solenoid valve LS-203 by the change amount d203 in order to reduce the correction value b204. Accordingly, the correction values b204 and b205 of the solenoid valve LS-204 and the solenoid valve LS-205 are decreased by the change amount d203. At this time, the change amount d203 is determined as follows.

  Since the correction value b204 of the solenoid valve LS-204 does not have a margin to be corrected upward, the indicated value of the solenoid valve LS-203 and the solenoid valve are used by using a margin for correction below the correction value b205 of the solenoid valve LS-205. Change the correction value of LS-204. First, the control circuit 300 obtains d205 which is the difference between the correction value b205 of the solenoid valve LS-205 and its lower limit value ld-205. Here, the difference d205 is represented by the length from the correction value b205 to the lower limit value ld-205 in FIG. 10a. Then, a value obtained by dividing the difference d205 by 2 is set as a change amount d203, which is added to the indicated value b203 of the solenoid valve LS-203. In this way, the control circuit 300 obtains the new indicated value a203 of the solenoid valve LS-203. Accordingly, the control circuit 300 subtracts the change amount d203 from the correction values B204 and B205 of the solenoid valves LS-204 and LS-205. Then, new correction values a204 and a205 of the solenoid valves LS-204 and LS-205 are obtained.

  So far, an example has been described in which the correction value is recalculated when one of the correction values of the solenoid valves LS-204 and LS-205 exceeds a predetermined value. Hereinafter, an example in which the correction value is recalculated when both of the correction values of the solenoid valves LS-204 and LS-205 exceed a predetermined value will be described. This recalculation method can also be used when the number of correction value changes exceeds a predetermined number and the recalculation condition is satisfied.

  FIG. 11 shows the correction values of the solenoid valves LS-204 and LS-205 and the indicated values of the solenoid valve LS-203 when the correction values of the solenoid valves LS-204 and LS-205 exceed a predetermined value. It is a graph. When the correction value recalculation conditions in step S8 are checked, if both the correction values β204 and β205 of the solenoid valves LS-204 and LS-205 exceed the predetermined value γ as shown in FIG. The condition is met, and the process proceeds to step S9.

  In step S9, first, γ / 2 is added to the indicated value β203 of the solenoid valve LS-203 to calculate a new indicated value α203. At this time, the correction values β204 and β205 of the solenoid valves LS-204 and LS-205 are subtracted by γ / 2 to become new correction values α204 and α205.

  When the recalculation of the correction value in step S9 is completed, the operation flowchart of FIG. 8 ends. The correction values of the solenoid valves LS-204 and LS-205 obtained in step S9 are used in step S1 in the next execution of the operation flowchart of FIG.

  As described above, the control circuit of the hydraulic control device according to the present invention newly adds a hydraulic pressure detection means such as a pressure sensor by correcting both the hydraulic pressure control means for controlling the base pressure and the hydraulic pressure control means for controlling the working pressure. Without adding to the above, it is possible to control the plurality of hydraulic control means equally and to suppress the occurrence of bias in the heat generation in the control circuit for controlling the hydraulic control means.

  The control circuit of the hydraulic control device according to the present invention adds a hydraulic pressure detection means such as a pressure sensor by correcting both the hydraulic pressure control means for controlling the base pressure and the hydraulic pressure control means for controlling the working pressure. Without this, the correction ranges of both the hydraulic pressure control means for adjusting the base pressure and for adjusting the working pressure can be used effectively.

  In the present specification, the hydraulic pressure adjusting means for adjusting the base pressure and the working pressure is described using a solenoid valve, but other types of valves may be used.

  Furthermore, in the present specification, the detection of the working pressure is described using the pressure sensor, but it is also possible to detect the hydraulic pressure using the number of rotations of the rotating member in the engaging member.

  Further, in this specification, the inner diameters of the oil passages for supplying the working pressure are all assumed to be equal. However, the indicated value and the correction value can be adjusted according to the inner diameter of the oil passage.

It is a figure which shows the vehicle carrying a hydraulic control apparatus. It is the structure of the conventional hydraulic control apparatus. It is a block diagram of clutch C1-402 and clutch C2-403 which are engaging members. It is a figure explaining formation of the gear stage in an automatic transmission. It is a block diagram of the solenoid valve used for a hydraulic control apparatus. It is an operation | movement flowchart in the conventional hydraulic control apparatus. It is a block diagram of the hydraulic control apparatus used as the control object in this invention. It is an operation | movement flowchart of the control circuit of the hydraulic control apparatus in this invention. It is a graph which shows the correction value of solenoid valves LS-204 and LS-205, and the indicated value of solenoid valve LS-203. It is a graph which shows the correction value of solenoid valves LS-204 and LS-205, and the indicated value of solenoid valve LS-203. 6 is a graph showing recalculation of correction values and indicated values of solenoid valves LS-203 when the correction values of solenoid valves LS-204 and LS-205 exceed a predetermined value.

Explanation of symbols

10 Hydraulic control device
20 Transmission
30 engine
40 front wheels
50 ECU
P1 pump
PS1, PS2 Pressure sensor
LS-203, LS-204, LS-205 Solenoid valve
OL-20, OL-30, OL-40 Oilway
300 Control circuit
321, 322, 323 Solenoid drive

Claims (4)

Hydraulic pressure generating means for supplying hydraulic oil to the first oil passage;
First hydraulic pressure adjusting means for adjusting the hydraulic pressure of hydraulic oil supplied from the hydraulic pressure generating means via the first oil passage in accordance with the supplied drive current;
The hydraulic pressure of the hydraulic oil supplied from the first hydraulic pressure adjusting means via the second oil passage is adjusted according to the supplied drive current, and a third oil passage provided corresponding to each of the hydraulic oil is provided. A plurality of second hydraulic pressure adjusting means to be supplied;
It is provided corresponding to each of the second hydraulic pressure adjusting means, and is engaged when the hydraulic pressure of the hydraulic oil supplied from the second hydraulic pressure adjusting means via the third oil passage is a predetermined value or more. A plurality of engaging members that release when less than a predetermined value and form one gear stage by a combination of engagement and release;
A control circuit configured to control a hydraulic control device installed in each of the third oil passages and having a plurality of oil pressure detection means for detecting the oil pressure of the third oil passage corresponding to the engagement member;
A plurality of oil pressure receivers provided corresponding to each of the oil pressure detecting means, receiving a signal from the oil pressure detecting means, and acquiring the detected oil pressure;
Provided corresponding to each of the first and the plurality of second hydraulic pressure adjusting means, and supplies a drive current to the first and the plurality of second hydraulic pressure adjusting means to control the hydraulic pressure. A plurality of hydraulic adjustment means driving units;
And a calculation unit that determines the drive current supplied to the first and the plurality of second hydraulic pressure adjusting units by the hydraulic pressure adjusting unit driving unit according to the detected hydraulic pressure acquired by the hydraulic pressure receiving unit,
The calculation unit sets a plurality of correction values, which are differences between a target value of the hydraulic pressure supplied to each of the plurality of engaging members and a detected hydraulic pressure corresponding to each of the plurality of engaging members, at a predetermined time. Calculate the number of times,
When at least one of the plurality of correction values corresponding to the plurality of second hydraulic pressure adjusting means exceeds a predetermined range, the drive current to the plurality of second hydraulic pressure adjusting means is increased or decreased by a predetermined amount, A control circuit characterized in that the drive current to the first hydraulic pressure adjusting means is decreased or increased by the predetermined amount. Hydraulic pressure generating means for supplying hydraulic oil to the first oil passage;
First hydraulic pressure adjusting means for adjusting the hydraulic pressure of hydraulic oil supplied from the hydraulic pressure generating means via the first oil passage in accordance with the supplied drive current;
The hydraulic pressure of the hydraulic oil supplied from the first hydraulic pressure adjusting means via the second oil passage is adjusted according to the supplied drive current, and a third oil passage provided corresponding to each of the hydraulic oil is provided. A plurality of second hydraulic pressure adjusting means to be supplied;
It is provided corresponding to each of the second hydraulic pressure adjusting means, and is engaged when the hydraulic pressure of the hydraulic oil supplied from the second hydraulic pressure adjusting means via the third oil passage is a predetermined value or more. A plurality of engaging members that release when less than a predetermined value and form one gear stage by a combination of engagement and release;
A control circuit configured to control a hydraulic control device installed in each of the third oil passages and having a plurality of oil pressure detection means for detecting the oil pressure of the third oil passage corresponding to the engagement member;
A plurality of oil pressure receivers provided corresponding to each of the oil pressure detecting means, receiving a signal from the oil pressure detecting means, and acquiring the detected oil pressure;
Provided corresponding to each of the first and the plurality of second hydraulic pressure adjusting means, and supplies a drive current to the first and the plurality of second hydraulic pressure adjusting means to control the hydraulic pressure. A plurality of hydraulic adjustment means driving units;
And a calculation unit that determines the drive current supplied to the first and the plurality of second hydraulic pressure adjusting units by the hydraulic pressure adjusting unit driving unit according to the detected hydraulic pressure acquired by the hydraulic pressure receiving unit,
The calculation unit sets a plurality of correction values, which are differences between a target value of the hydraulic pressure supplied to each of the plurality of engaging members and a detected hydraulic pressure corresponding to each of the plurality of engaging members, at a predetermined time. Calculate the number of times,
When the difference between at least one of the plurality of correction values corresponding to the plurality of second hydraulic pressure adjusting means exceeds the predetermined number, the drive current to the plurality of second hydraulic pressure adjusting means is determined. A control circuit characterized by increasing or decreasing by a fixed amount and decreasing or increasing the drive current to the first hydraulic pressure adjusting means by the predetermined amount. In claim 2,
The calculation unit calculates a drive current to the plurality of second hydraulic pressure adjusting means when at least one of the plurality of correction values corresponding to the plurality of second hydraulic pressure adjusting means continuously increases or decreases a predetermined number of times. A control circuit characterized by increasing or decreasing by a predetermined amount and decreasing or increasing a drive current to the first hydraulic pressure adjusting means by the predetermined amount. A hydraulic control device that controls a hydraulic circuit in which a plurality of control valves are provided in an oil passage provided between an oil supply source and a drive unit that is driven by hydraulic oil from the oil supply source,
Feedback control means for performing control while correcting so that a control value for controlling the opening of at least one control valve in the plurality of control valves approaches an instruction value;
When it is determined that the state in which the correction value in the feedback control means is a predetermined amount or more in the same valve drive direction is constantly occurring, at least a part of the correction amount in the feedback means is used as the plurality of controls. Correction amount distribution means for distributing a correction amount for controlling a control valve different from the control valve controlled by the feedback means in the valve;
A hydraulic control device comprising:

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