JP2006349000A - Controller for actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller for an actuator capable of controlling a clutch properly and suppressing erroneous determination of abnormality. <P>SOLUTION: An ECU performs a program including a step (S102) for supplying oil pressure irrespective of a detection signal from a stroke sensor while determination of abnormality of a slave cylinder based on changes of a position of a piston of the slave cylinder is inhibited when supplying oil pressure to the slave cylinder for the first time at a factory if there is no history for supplying oil pressure into an oil chamber of the slave cylinder from an oil pressure generation source (NO at S100), that is, in an initial condition after assembly of the slave cylinder. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a control device for an actuator that brings a friction engagement element into a released state, and more particularly, to an actuator in which a seal member (cup) that forms part of an oil chamber to which hydraulic pressure is supplied and a piston are separate. The present invention relates to a control device.

  Conventionally, a friction engagement element (clutch) is provided between the engine and the transmission. In order to automatically control the state of the clutch without depending on the clutch pedal operation by the driver, there is a vehicle provided with an actuator. For example, a slave cylinder that is operated by hydraulic pressure is used as the actuator.

  Japanese Patent Laying-Open No. 2002-139075 (Patent Document 1) discloses a hydraulic clutch disengagement device (slave cylinder) that can easily incorporate a piston into a hydraulic chamber. The hydraulic clutch disengagement device described in Patent Literature 1 pushes a clutch spring with oil pressure to interrupt power transmission from a power source to a transmission. This hydraulic clutch disconnection device is fixedly arranged from an annular space between an inner cylinder in which an input shaft of a transmission is inserted on the inner periphery and a fixedly arranged coaxially with the inner cylinder. An outer cylinder that forms a hydraulic chamber, a cylindrical piston that is incorporated in the hydraulic chamber from one end side so as to be axially displaceable, and that is disposed on one end side of the piston and slides elastically between the inner cylinder and the outer cylinder. A seal ring and a release bearing attached to the other end of the piston and abutted against the inner edge of the clutch spring are included. On the outer peripheral surface of the inner cylinder, the guide area for reciprocating the piston is set to have a substantially constant outer diameter in the axial direction, and the area from the clutch side end to the clutch side edge in that area is the non-piston area of the piston. The guide area is set smaller than the outer diameter of the piston guide area.

According to the hydraulic clutch disconnection device described in this publication, even if the outer diameter of the guide region is set corresponding to the tightening margin of the lip of the seal ring on the outer peripheral surface of the inner cylinder, the non-guide region is guided. It is set smaller than the outer diameter of the region. Therefore, it is possible to prevent the lip from turning up in the non-guide area before the piston is installed in the hydraulic chamber, and as a result, the piston can be easily installed in the hydraulic chamber, thereby reducing the work cost of the installation. Can do.
JP 2002-139075 A

  By the way, the piston is urged by the spring so as to come into contact with the clutch spring (diaphragm spring). Therefore, when assembling the slave cylinder to the vehicle, for example, the piston is fixed in a state where the spring is contracted by a jig or the like, and the slave cylinder is assembled to the vehicle. After assembly, the spring is extended by removing the jig, and the piston moves to abut against the diaphragm spring. At this time, only the piston may move, and the piston and the seal ring (cup) may be separated. In this state, when the vehicle system is started assuming that the assembly of the vehicle is completed, the piston does not move because the cup is not in contact with the piston even if the hydraulic pressure is supplied to the slave cylinder. In this case, since the detection signal of the stroke sensor that detects the position of the piston does not change even though the hydraulic pressure is supplied, there is a problem that the stroke sensor or the like may be erroneously determined to be abnormal. It was.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an actuator control device that can suppress erroneous determination of abnormality.

  The actuator control apparatus according to the first invention controls the actuator of the friction engagement element. The actuator forms a part of an oil chamber to which hydraulic pressure is supplied, and includes a slidable seal member and a piston that is separated from the seal member and is pushed by the seal member to release the friction engagement element. Including. The control device includes a control unit for controlling the hydraulic pressure in accordance with a detection signal from the detection unit for detecting the position of the piston, and a hydraulic pressure for supplying the hydraulic pressure at a predetermined time regardless of the detection signal. Supply means.

  According to the first invention, for example, when the hydraulic pressure is supplied to the actuator for the first time, the hydraulic pressure is supplied regardless of the change in the detection signal from the detection means (for example, a stroke sensor) for detecting the position of the piston. That is, since the seal member and the piston are separated from each other, the hydraulic pressure is supplied ignoring the detection signal from the stroke sensor at a time when there is a high possibility that the piston will not move even if the hydraulic pressure is supplied. As a result, in a state where it is natural that the detection signal of the stroke sensor does not change even though the hydraulic pressure is supplied, it is determined that the abnormality is determined by the change of the detection signal of the stroke sensor. Can be suppressed. As a result, it is possible to provide an actuator control device that can suppress erroneous determination of abnormality.

  In addition to the configuration of the first invention, the actuator control device according to the second invention is determined in advance with a determination unit for determining abnormality of the detection unit based on the relationship between the supply state of the hydraulic pressure and the detection signal. And prohibiting means for prohibiting the determination by the abnormality determining means at a certain time.

  According to the second invention, the abnormality determination of the detection means is prohibited at the time when the hydraulic pressure is supplied regardless of the change of the detection signal from the detection means for detecting the position of the piston. As a result, since the seal member and the piston are separated from each other, the detection means is abnormal in a state where it can be assumed that the detection signal of the detection means does not change even though the hydraulic pressure is supplied. Can be prevented from being erroneously determined.

  In the actuator control apparatus according to the third aspect of the invention, in addition to the configuration of the first or second aspect of the invention, the predetermined time is a time when the hydraulic pressure is first supplied to the actuator.

  According to the third invention, when the hydraulic pressure is supplied to the actuator for the first time, there is a high possibility that the seal member and the piston are separated from each other, so the hydraulic pressure is supplied regardless of the detection signal from the detection means. Judgment by means is prohibited. As a result, in a state where it is natural that the detection signal of the stroke sensor does not change even though the hydraulic pressure is supplied, it is determined that the abnormality is determined by the change of the detection signal of the stroke sensor. Can be suppressed. Therefore, erroneous determination of abnormality can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  A vehicle equipped with a control device according to an embodiment of the present invention will be described with reference to FIG. The vehicle travels when the driving force generated by the engine 100 is transmitted to the wheels 404 via the clutch 200, the transmission 300, the differential gear 400, and the drive shaft 402. Engine 100, clutch 200, and transmission 300 are controlled by an ECU (Electronic Control Unit) 500. The control device according to the present embodiment is expressed by a program executed in ECU 500, for example.

  Clutch 200 is connected to crankshaft 600 of engine 100. Clutch output shaft 202 is connected to input shaft 302 of transmission 300 via spline 310.

  The transmission 300 is composed of a constantly meshing gear train. The gear stage in the transmission 300 is selected by sliding the shift fork shaft by the actuator 304. The actuator 304 may be operated by hydraulic pressure, or may be operated by electric power. The transmission 300 may be anything as long as it can automatically select the transmission gear ratio, such as AT (Automatic Transmission) and CVT (Continuously Variable Transmission) which are planetary gear mechanisms.

  The ECU 500 includes an accelerator opening sensor 502, a brake switch 504, a position sensor 506, a crank position sensor 510 provided opposite to the outer periphery of the timing rotor 508, an input shaft rotational speed sensor 512, an output shaft rotational speed sensor 514, a vehicle speed. Signals are transmitted from the sensor 516 and the G sensor 518.

The accelerator opening sensor 502 detects the accelerator opening of the accelerator pedal. The brake switch 504 detects whether the brake is on or off. The position sensor 506 detects the shift position of the shift lever. The crank position sensor 510 detects the engine speed NE. Input shaft rotational speed sensor 512 detects the rotational speed NI of input shaft 302 of transmission 300. Output shaft rotational speed sensor 514 detects the rotational speed NO of output shaft 306 of transmission 300. The vehicle speed sensor 516 detects the vehicle speed. The G sensor 518 detects the acceleration in the longitudinal direction of the vehicle.

  ECU 500 performs arithmetic processing based on signals transmitted from these sensors, a program stored in a memory (not shown), a map, a shift line, and the like. Thus, ECU 500 controls engine 100, clutch 200, and transmission 300.

  With reference to FIG. 2, a clutch 200 and a slave cylinder 700 which is an actuator for driving the clutch 200 will be described. In the present embodiment, the slave cylinder 700 is a CSC (Concentric Slave Cylinder). A slave cylinder other than the CSC may be used.

  The clutch 200 is a dry single-plate friction clutch. As shown in FIG. 2, the clutch 200 includes a clutch output shaft 202, a clutch disk 204 disposed on the clutch output shaft 202, a clutch housing 206, a pressure plate 208 disposed on the clutch housing 206, and a diaphragm. A spring 210.

  The diaphragm spring 210 urges the pressure plate 208 in the right direction in FIG. 2, whereby the clutch disc 204 is pressed against the flywheel 602 attached to the crankshaft 600 of the engine 100 and the clutch is engaged.

  When the inner end portion of the diaphragm spring 210 moves rightward in FIG. 2, the pressure plate 208 moves leftward in FIG. 2, and the clutch disc 204 and the flywheel 602 are separated to release the clutch.

  Slave cylinder 700 includes piston 702, bearing 704, cup 706, inner cylinder 708, outer cylinder 710, spring 712, and oil chamber 714.

  The piston 702 is provided so that one end thereof is in contact with the inner end of the diaphragm spring 210 via the bearing 704. As the piston 702 moves rightward in FIG. 2, the inner end portion of the diaphragm spring 210 moves rightward in FIG.

  A cup 706 is provided at the other end of the piston 702. The piston 702 and the cup 706 are separate bodies. The piston 702 and the cup 706 are provided in an annular space between the inner cylinder 708 and the outer cylinder 710 so as to be movable in the axial direction of the clutch output shaft 202.

  The spring 712 is provided on the outer peripheral side of the outer cylinder 710 so as to urge the piston 702 toward the diaphragm spring 210 side. The piston 702 always abuts against the diaphragm spring 210 by the urging force of the spring 712.

  An oil chamber 714 is formed by the cup 706, the inner cylinder 708 and the outer cylinder 710. Oil pressure is supplied from the oil pressure generation source 716 to the oil chamber 714. For example, an oil pump is used as the hydraulic pressure generation source 716. The hydraulic pressure generated by the hydraulic pressure generation source 716 is adjusted by a solenoid valve (not shown) or the like and supplied to the oil chamber 714.

  Due to the hydraulic pressure supplied to the oil chamber 714, the cup 706 moves to the right in FIG. 2 together with the piston 702. The magnitude of the hydraulic pressure supplied to the oil chamber 714 is controlled by the ECU 500.

  The position of the piston 702 is detected by the stroke sensor 720 using a magnet 718 provided on the piston 702. A signal representing the detection result of the stroke sensor 720 is transmitted to the ECU 500. Based on the signal transmitted from stroke sensor 720, ECU 500 detects whether clutch 200 is in a disengaged state, an engaged state, or a semi-engaged state.

  In the present embodiment, ECU 500 supplies hydraulic pressure based on a detection signal from stroke sensor 720 during normal times. At this time, if the position of the piston 702 does not change even though the oil pressure generation source 716 is controlled to supply the oil pressure to the oil chamber 714, that is, supply the oil pressure to the slave cylinder 700, the stroke sensor It is determined that 720 is abnormal. Instead of determining that the stroke sensor 720 is abnormal, it may be determined that some part of the slave cylinder 700 including the stroke sensor 720 is abnormal.

  With reference to FIG. 3, a control structure of a program executed by ECU 500 serving as the control device according to the present embodiment will be described.

  In step (hereinafter step is abbreviated as S) 100, ECU 500 determines whether or not there is a history of supplying hydraulic pressure from hydraulic pressure generation source 716 to oil chamber 714. Whether or not the hydraulic pressure is supplied from the hydraulic pressure generation source 716 to the oil chamber 714 is determined by the ECU 500 itself. Therefore, whether or not there is a history of the supply of hydraulic pressure from the hydraulic pressure generation source 716 to the oil chamber 714 is determined by the ECU 500. Determined internally. If there is a history of supplying hydraulic pressure (YES in S100), this process ends. If not (NO in S100), the process proceeds to S102.

  In S102, ECU 500 supplies oil pressure from oil pressure generation source 716 to oil chamber 714 in a state where abnormality determination based on a change in the position of piston 702 is prohibited and regardless of a detection signal from stroke sensor 720. In S104, ECU 500 stores in memory 520 the hydraulic pressure (duty ratio of the solenoid valve) at the time when the position of piston 702 starts to change.

  An operation of ECU 500 serving as the control device according to the present embodiment based on the above-described structure and flowchart will be described.

  When the slave cylinder 700 is assembled to the vehicle, the piston 702 is fixed in a state where the spring 712 is contracted by a jig or the like, and the slave cylinder 700 is assembled to the vehicle. After the assembly, the spring 712 is extended by removing the jig, and the piston 702 is moved to abut against the diaphragm spring 210. At this time, only the piston 702 may move, and the piston 702 and the cup 706 may be separated as shown in FIG.

  In this state, when the vehicle system is started assuming that the assembly of the vehicle is completed, the piston 702 does not move because the cup 706 is not in contact with the piston 702 even if the hydraulic pressure is supplied to the slave cylinder 700. Therefore, although the hydraulic pressure is supplied to the slave cylinder 700, the piston 702 does not move, so that it may be erroneously determined that the stroke sensor 720 is abnormal.

  In order to suppress erroneous determination of abnormality, when there is no history of supplying hydraulic pressure from the hydraulic pressure generation source 716 to the oil chamber 714 (NO in S100), that is, in the initial state after assembly of the slave cylinder 700, the first time in the factory. When hydraulic pressure is supplied to the slave cylinder 700, the hydraulic pressure is supplied in a state where abnormality determination based on a change in the position of the piston 702 is prohibited and regardless of the detection signal from the stroke sensor 720 (S102).

  As a result, the cup 706 contacts the piston 702 as indicated by a broken line in FIG. At this time, in the state where the abnormality determination based on the position of the piston 702 is prohibited, the detection signal from the stroke sensor 720 is ignored and the hydraulic pressure is supplied, so the stroke sensor 720 is supplied even though the hydraulic pressure is supplied. It is suppressed that the state where the detection signal does not change is determined to be abnormal. For this reason, since the cup 706 and the piston 702 are separated from each other, it is natural that the detection signal of the stroke sensor does not change and the stroke sensor 720 is abnormal because the detection signal of the stroke sensor does not change. It can suppress judging.

  In the initial state after assembly of the slave cylinder 700, the clutch 200 is engaged by the urging force of the diaphragm spring 210, and the piston 702 is in contact with the diaphragm spring 210 by the urging force of the spring 712. . Therefore, it can be said that the clutch 200 is in an engaged state at a position where the position of the piston 702 starts to change.

  In order to learn the oil pressure at this time, that is, the oil pressure when the clutch 200 is in the engaged state, the oil pressure at the time when the position of the piston 702 starts to change is stored in the memory 520 (S104). By controlling the hydraulic pressure supplied to the slave cylinder 700 based on the hydraulic pressure at this time, the rise time of the hydraulic pressure up to the engagement point of the clutch 200 can be shortened.

  As described above, in the initial state after assembly of the slave cylinder, the ECU that is the control device according to the present embodiment prohibits stroke sensor abnormality determination when supplying hydraulic pressure to the slave cylinder for the first time. Oil pressure is supplied regardless of the output signal from the stroke sensor. As a result, since the cup and the piston are separated from each other, it is natural that the detection signal of the stroke sensor is not likely to change. Can be suppressed.

In addition, in the initial state after the assembly of the slave cylinder 700, in addition to supplying hydraulic pressure to the slave cylinder 700 for the first time in the factory, every time the ignition switch is turned on, that is, every time the vehicle system is started, the piston The hydraulic pressure may be supplied to the slave cylinder 700 until the position 702 changes. The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a control block diagram which shows the vehicle carrying the control apparatus which concerns on embodiment of this invention. It is FIG. (1) which shows the clutch and slave cylinder of a vehicle which mount the control apparatus which concerns on embodiment of this invention. It is a flowchart which shows the control structure of the program which ECU of the control apparatus which concerns on embodiment of this invention performs. It is FIG. (2) which shows the clutch and slave cylinder of a vehicle which mount the control apparatus which concerns on embodiment of this invention.

Explanation of symbols

  200 Clutch, 500 ECU, 520 Memory, 700 Slave cylinder, 702 Piston, 704 Bearing, 706 Cup, 708 Inner cylinder, 710 Outer cylinder, 712 Spring, 714 Oil chamber, 716 Hydraulic source, 718 Magnet, 720 Stroke sensor.

Claims (3)

A control device for an actuator of a friction engagement element, wherein the actuator forms a part of an oil chamber to which hydraulic pressure is supplied, and is slidably separated from a seal member and the seal member. A piston that is pushed by a member to release the frictional engagement element;
Control means for controlling the hydraulic pressure in response to a detection signal from a detection means for detecting the position of the piston;
A control device for an actuator, including supply means for supplying hydraulic pressure regardless of the detection signal at a predetermined time. The control device includes a determination unit for determining an abnormality of the detection unit based on a relationship between a hydraulic pressure supply state and a detection signal;
The actuator control device according to claim 1, further comprising: prohibiting means for prohibiting determination by the abnormality determining means at the predetermined time.   The actuator control device according to claim 1, wherein the predetermined time is a time when hydraulic pressure is supplied to the actuator for the first time.

Images