JP4404985B2 - Clutch control method and clutch control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a clutch control method and a clutch control device for engaging a clutch of an automatic transmission.
[0002]
[Prior art]
Conventionally, an automatic transmission of an automobile has been provided with a hydraulic circuit that controls a clutch. The hydraulic circuit includes a manual valve that operates in conjunction with a select lever, and a pressure regulating valve that operates according to a command pressure or a control signal. And are provided.
[0003]
As shown in FIG. 8, the manual valve adjusts the pilot pressure from the oil pump driven when the engine is operated when the select lever is selected from neutral N or parking P to drive D or reverse R. It is comprised so that it may transmit to a pressure valve. The pressure regulating valve is configured to be controlled to open according to the command pressure and the control signal, and is configured to gradually increase the control pressure output from the pressure regulating valve to the clutch. Thereby, the clutch is configured to be smoothly connected.
[0004]
However, at the time of low temperature, as the viscosity of the oil in the hydraulic circuit increases or the temperature of the components in the pressure regulating valve decreases, the responsiveness O of the pressure regulating valve decreases as shown by the one-dot chain line in FIG. Sometimes. In this case, there is a problem that it takes time until the control pressure increases, and the engagement time of the clutch is delayed.
[0005]
In order to solve this, as shown in FIG. 9, a method of opening the pressure regulating valve in advance can be considered. In this case, at the time of low temperature, as shown by the alternate long and short dash line in FIG. 9, the rising time of the control pressure P1 can be shortened, so that the engagement time of the clutch can be shortened.
[0006]
[Problems to be solved by the invention]
However, in the clutch control method described above, when the manual valve is opened by operating the select lever when the oil viscosity is low, the oil that has been prevented from flowing in by the manual valve rushes into and becomes an oil hammer. As a result, the control pressure P2 for controlling the clutch is higher than usual immediately after the operation of the select lever, as shown by a solid line in FIG.
[0007]
In order to solve this, it is conceivable to provide an orifice between the manual valve and the pressure regulating valve. However, in this case, the response at the time of clutch engagement is always deteriorated.
[0008]
The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a clutch control method and a clutch control device capable of improving the fastening performance of the clutch.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, in the clutch control method according to claim 1 of the present invention, a manual valve in which the oil pressure from an oil pump driven when the engine is operated is interlocked with the operation of the select lever, and the manual valve. maintained in the clutch control method for an automatic transmission clutch is engaged when it is transmitted through the opening and closing being controlled regulating valve connected in series, to the open state when the oil pump non-driven due to engine stop the pressure regulating valve which is, as well as closing operation on the basis of the start of the oil pump with the engine start, after the manual valve is opening operation according to the operation of the select lever, the valve opening control of the pressure regulating valve Start.
[0010]
That is, when the viscosity of the oil is increased at low temperatures and the responsiveness of the pressure regulating valve is reduced as the component temperature is lowered, the pressure regulating valve is delayed in closing operation as well as opening operation. For this reason, when the pressure regulating valve is closed based on the start of the oil pump, the closing operation of the pressure regulating valve is delayed, thereby forming a half-open state of the pressure regulating valve. On the other hand, at the normal temperature at which the pressure regulating valve normally operates, after the valve is closed, the valve opening control is started after the manual valve is opened according to the operation of the select lever. Occurrence of an oil hammer due to the entry of oil flowing in through the valve is prevented.
[0011]
In the clutch control method according to claim 2, execution of the closing operation of the pressure regulating valve based on the start of the oil pump and the valve opening control of the pressure regulating valve based on the opening operation of the manual valve is performed. Judge based on temperature rise.
[0012]
That is, by determining from the oil temperature that the hydraulic circuit comprising the manual valve and the pressure regulating valve has reached a normal temperature at which it can normally operate, when the oil temperature has reached the normal temperature, the oil pump is started. When the oil temperature has not reached the normal temperature, the closing operation of the pressure regulating valve and the opening operation of the pressure regulating valve described above are performed. Control such as bypassing valve control is possible.
[0013]
In this case, when the oil temperature has reached the normal temperature, the occurrence of oil hammer due to the entry of oil is prevented as in claim 1, while when the oil temperature has not reached the normal temperature, Since the valve-opening state of the pressure regulating valve is continued, a delay in clutch engagement time due to an increase in oil viscosity is prevented. In addition, since the viscosity of the oil is increased, the entry of the oil is naturally restricted, and the occurrence of an oil hammer is prevented.
[0014]
Then, in the clutch control device according to claim 3, the oil pressure of the oil from the oil pump that is driven during engine operation, series-connected opening and closing control to the manual valve and the manual valve interlocked with the operation of the select lever a clutch control device for an automatic transmission clutch is engaged when it is transmitted through the to the pressure regulating valve, the pressure regulating valve which is maintained in the open state when the oil pump non-driven due to engine stop, the engine and closing means for closing operation on the basis of the start of the oil pump due to start, after the manual valve in response to the operation of the select lever is opening operation, the valve opening control to start the valve opening control of the pressure regulating valve Means.
[0015]
That is, when the engine is operated and the oil pump is driven, the pressure regulating valve that is kept open when the oil pump is not driven is closed by the valve closing means. Then, after the manual valve is opened according to the operation of the select lever, the valve opening control means starts the valve opening control by the valve opening control means. For this reason, at a low temperature when the viscosity of the oil is increased and the responsiveness of the pressure regulating valve is lowered, the closing operation of the pressure regulating valve by the valve closing means is delayed, so that a half-open state of the pressure regulating valve is formed. . On the other hand, at the normal temperature at which the pressure regulating valve normally operates, the valve opening control is started by the valve opening control means after the pressure regulating valve is closed by the valve closing means. Occurrence of oil hammer due to the rush of oil flowing in is prevented.
[0016]
In the clutch control device according to a fourth aspect of the present invention, the clutch control device further includes determination means for determining execution of the valve closing means and the valve opening control means based on a rise in the temperature of the oil.
[0017]
That is, when the oil temperature has reached the normal temperature by determining from the oil temperature that the hydraulic circuit comprising the manual valve and the pressure regulating valve has reached a normal temperature at which it can normally operate, While the valve closing means and the valve opening control means are executed, when the oil temperature does not reach the normal temperature, the valve closing means and the valve opening control means can be bypassed.
[0018]
In this case, when the oil temperature has reached the normal temperature, the occurrence of oil hammer due to the entry of oil is prevented as in claim 3, while when the oil temperature has not reached the normal temperature, Since the valve-opening state of the pressure regulating valve is continued, a delay in clutch engagement time due to an increase in oil viscosity is prevented. In addition, since the viscosity of the oil is increased, the entry of the oil is naturally restricted, and the occurrence of an oil hammer is prevented.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
[0020]
A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a clutch control device 1 according to the present embodiment. The clutch control device 1 controls the engagement of a clutch in an automatic transmission 2 of an automobile.
[0021]
As shown in FIG. 2, the automatic transmission 2 allows oil sent from an oil pump driven when the engine is operated to flow through a manual valve 11 that is a manual valve that is interlocked with the operation of the select lever. Thereafter, a hydraulic circuit 14 is provided for transmission to the clutch fastening means 13 via a normally open pressure regulating valve 12. The pilot pressure Pp due to the oil from the oil pump is regulated by the pressure regulating valve 12 and outputted as a control pressure, and then applied to the clutch fastening means 13 so that the clutch is controlled to be fastened. . The pressure regulating valve 12 includes a hydraulic valve that is controlled to open / close in response to a command pressure and an electromagnetic valve that is controlled to open / close in response to a control signal, and is configured to be controlled by the clutch control device 1 illustrated in FIG. Has been.
[0022]
That is, as shown in FIG. 1, the clutch control device is mainly configured by a control unit 21 having a CPU, a ROM, and a RAM, and the control unit 21 includes a rotational speed for detecting an engine rotational speed. A detection unit 22 and a vehicle speed detection unit 23 for detecting the vehicle speed are connected. The control unit 21 is connected to a range position detection unit 24 for detecting a range position of a select lever provided in the passenger compartment and a gear position control unit 25. The range position and the engine speed The automatic transmission 2 can be shifted to an appropriate gear based on the vehicle speed. Further, the control unit 21 is connected to a pressure regulating valve control unit 26 that outputs a command pressure or a control signal to the pressure regulating valve 12, and detects the temperature of oil in the hydraulic circuit 14 in the automatic transmission 2. An oil temperature detecting unit 27 is connected.
[0023]
The operation of the automatic transmission 2 according to the present embodiment having the above configuration will be described with reference to the flowchart shown in FIG. 3 and the timing chart shown in FIG.
[0024]
That is, when the CPU in the control unit 21 of the clutch control device 1 operates according to the program stored in the ROM, first, in step S1, it is determined whether the oil pump is driven by operating the engine. As a result of the determination, if the oil pump is not operated, the process is terminated without performing the subsequent processing. On the other hand, if the oil pump is operated, the automatic transmission 2 is set via the pressure regulating valve control unit 26. The pressure regulating valve 12 in the hydraulic circuit 14 is closed (see T1 in FIG. 4).
[0025]
At this time, in the hydraulic circuit 14, when the pressure regulating valve 12 is normally operated, the pressure regulating valve 12 is closed in accordance with a command pressure or a control signal of the pressure regulating valve control unit 26 (in FIG. 4). See T1). On the other hand, in cold regions, the viscosity of the oil may be increased due to a decrease in the oil temperature, and the responsiveness of the pressure regulating valve 12 may decrease as the component temperature decreases, and the pressure regulating valve 12 may be opened. At the same time, the closing operation is delayed. For this reason, the closing operation of the pressure regulating valve 12 is delayed, and the pressure regulating valve 12 is in a half-open state H as shown by a one-dot chain line in FIG. 4 (see T1 to T4 in FIG. 4).
[0026]
Then, whether or not the select lever has been operated from the neutral N or the parking P to the drive D or reverse R is detected via the range position detection unit 24 to determine this (S3). As a result, when the operation is not performed, the process is terminated without performing the subsequent processing. On the other hand, when the range position is changed to the drive D or the reverse R and the manual valve 11 is opened (see T2 in FIG. 4), After waiting for a predetermined predetermined time (S4), the pressure regulating valve is gradually opened (see T3 to T4 in FIG. 4), and valve opening control is started (S5).
[0027]
At this time, when the pressure regulating valve 12 is normally operated, the pressure regulating valve 12 is closed (see T1 in FIG. 4) and then the manual valve 11 is opened according to the operation of the select lever. Since the valve opening control is started after the lapse of the predetermined time (see T3 in FIG. 4), it is possible to reliably prevent the occurrence of oil hammer due to the rush of oil flowing in through the pressure regulating valve 12. Therefore, as compared with the case where the pressure regulating valve 12 is opened in advance, it is possible to prevent oil hammer due to oil rush when the manual valve 11 is opened, and to reduce the shock at the time of clutch engagement. In addition, compared with a case where an orifice is provided between the manual valve 11 and the pressure regulating valve 12, it is possible to prevent a decrease in response at the time of clutch engagement.
[0028]
On the other hand, at the time of low temperature, the pressure regulating valve 12 operated based on the start of the oil pump is utilized by utilizing the fact that the viscosity of the oil is increased and the responsiveness of the pressure regulating valve 12 is lowered as the temperature of the components is lowered. Can be delayed. As a result, the pressure regulating valve 12 can be set to the half-open state H from the time when the pressure-regulating valve 12 is closed to the time when the valve-opening control is performed (see the alternate long and short dash line in T1 to T4 in FIG. 4). When the manual valve 11 is opened according to the operation of the lever and the pressure regulating valve 12 is controlled to open, even if the valve opening speed of the pressure regulating valve 12 decreases, the valve opening time until the valve is fully opened is reduced. It can be shortened. As a result, the increase in control pressure output from the pressure regulating valve 12 is also prevented (see T2 to T4 in FIG. 4), so that the clutch engagement time can be shortened even at low temperatures.
[0029]
Therefore, it is possible to improve the clutch fastening performance at low temperatures and normal temperatures without impairing responsiveness.
[0030]
(Second Embodiment)
[0031]
FIG. 5 is a diagram showing a flowchart according to the second embodiment, and only the portions different from the control of the clutch control device 1 described above will be described using the timing chart shown in FIG. 6 and FIG.
[0032]
That is, in the present embodiment, Step 11 is added between Step S1 and Step S2 of the first embodiment, and Step S11 is the oil temperature in the hydraulic circuit 14 of the automatic transmission 2. Is a determination process for detecting whether or not the oil temperature is lower than a predetermined temperature. Specifically, based on the temperature characteristics of the oil used in the hydraulic circuit 14 and the temperature characteristics of the pressure regulating valve 12, a predetermined temperature at which the hydraulic circuit 14 can normally operate is stored in the ROM in advance as a normal temperature, and this ROM is stored in the ROM. This is a process of comparing the stored room temperature with the detected oil temperature. When the oil temperature has reached the room temperature, the process after step S2 is sequentially executed, while the oil temperature has reached the room temperature. If not, the process ends without performing each process.
[0033]
In this case, when the oil temperature has reached the normal temperature, it is possible to prevent the occurrence of oil hammer due to the rush of oil as in the first embodiment, and to reduce the shock at the time of clutch engagement. it can.
[0034]
Further, when the oil temperature does not reach the normal temperature, the open state K of the pressure regulating valve 12 is continued as shown by the one-dot chain line in FIGS. 7 and 6. Even when 11 is opened, since the viscosity of the oil is increased, the control pressure output from the pressure regulating valve 12 is prevented from being delayed (see T2 to T4 in FIG. 6). Time delay can be prevented. Further, since the viscosity of the oil is increased, the entry of the oil is naturally restricted and the occurrence of the oil hammer can be prevented, so that the shock at the time of clutch engagement can be eased.
[0035]
【The invention's effect】
As described above, in the clutch control method according to claim 1 of the present invention, when the viscosity of the oil is increased or the responsiveness of the pressure regulating valve is lowered due to the low temperature of the components at low temperatures. The closing operation of the pressure regulating valve that is operated based on the start of the oil pump can also be delayed. As a result, the pressure regulating valve can be brought into a half-open state. In this half-open state, the manual valve is opened in response to the operation of the select lever, and when the pressure regulating valve is controlled to open, the pressure regulating valve is opened. Even when the valve speed decreases, the valve opening time until the valve is fully opened can be shortened. As a result, the clutch engagement time can be shortened even at low temperatures.
[0036]
On the other hand, at the normal temperature when the pressure regulating valve normally operates, after the valve is closed, the valve opening control is started after the manual valve is opened according to the operation of the select lever. It is possible to prevent the occurrence of oil hammer due to the rush of oil flowing in through the pressure valve. Therefore, compared with the case where the pressure regulating valve is opened in advance, it is possible to prevent the oil hammer due to the oil rush when the manual valve is opened, and to reduce the shock at the time of clutch engagement. As compared with a case where an orifice is provided between the manual valve and the pressure regulating valve, it is possible to prevent a decrease in responsiveness at the time of clutch engagement.
[0037]
Therefore, it is possible to improve the clutch fastening performance at low temperatures and normal temperatures without impairing responsiveness.
[0038]
In the clutch control method of claim 2, when the oil temperature has reached the normal temperature by judging from the oil temperature that the hydraulic circuit comprising the manual valve and the pressure regulating valve has reached a normal temperature at which it can normally operate. When the oil temperature has not reached the room temperature, the closing operation of the pressure regulating valve based on the start of the oil pump and the valve opening control of the pressure regulating valve based on the opening operation of the manual valve are executed. Control such as bypassing the closing operation and valve opening control of the pressure regulating valve is possible.
[0039]
In this case, at the normal time when the oil temperature reaches the normal temperature, the occurrence of oil hammer due to the entry of oil can be prevented and the shock at the time of clutch engagement can be eased as in the first aspect. On the other hand, at the time when the oil temperature does not reach the normal temperature, the valve-opening state of the pressure regulating valve is continued, so that it is possible to prevent a delay in clutch engagement time due to an increase in oil viscosity. In addition, since the viscosity of the oil is high, the entry of the oil is naturally restricted, and the occurrence of an oil hammer can be prevented, so that the shock at the time of clutch engagement can be eased.
[0040]
In the clutch control device according to claim 3, when the oil viscosity is high or the responsiveness of the pressure regulating valve is reduced due to the low temperature of the components at low temperatures, the valve closing means closes the oil pump. The closing operation of the pressure regulating valve operated based on the start is delayed. As a result, the pressure regulating valve is in a half-open state after the valve closing means, and in this half-open state, the manual valve is opened according to the operation of the select lever, and the pressure regulating valve is controlled to open by the valve opening control means. At this time, even when the valve opening speed of the pressure regulating valve decreases, the valve opening time until the valve is fully opened can be shortened. As a result, the clutch engagement time can be shortened even at low temperatures.
[0041]
On the other hand, at a normal temperature at which the pressure regulating valve normally operates, the pressure regulating valve is closed by the valve closing means and then opened by the valve opening control means after the manual valve is opened according to the operation of the select lever. Since the control is started, it is possible to prevent the occurrence of an oil hammer due to the rush of oil flowing in through the pressure regulating valve. Therefore, compared to the case where the pressure regulating valve is opened in advance, it is possible to prevent oil hammer due to oil rush when the manual valve is opened, and to reduce the shock at the time of clutch engagement. As compared with a case where an orifice is provided between the manual valve and the pressure regulating valve, it is possible to prevent a decrease in responsiveness at the time of clutch engagement.
[0042]
Therefore, as in the case of claim 1, the fastening performance of the clutch at low temperature and normal temperature can be improved without impairing responsiveness.
[0043]
Further, in the clutch control device according to claim 4, the oil temperature is brought to the normal temperature by determining from the oil temperature by the determining means that the hydraulic circuit including the manual valve and the pressure regulating valve has reached a normal temperature at which it can normally operate. If the temperature has reached, the valve closing means closes the pressure regulating valve and the valve opening control means performs the valve opening control. If the oil temperature does not reach the normal temperature, the valve closing control closes. Control such as bypassing the means and the valve opening control means is possible.
[0044]
In this case, at the normal time when the oil temperature reaches the normal temperature, the occurrence of an oil hammer due to the entry of oil can be prevented and the shock at the time of clutch engagement can be eased as in the third aspect. On the other hand, at the time when the oil temperature does not reach the room temperature, the valve-opening state of the pressure regulating valve is continued, so that it is possible to prevent a delay in clutch engagement time due to an increase in oil viscosity. In addition, since the viscosity of the oil is increased, the entry of the oil is naturally restricted and the occurrence of the oil hammer can be prevented, so that the shock at the time of clutch engagement can be eased.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a first embodiment of the present invention.
FIG. 2 is a circuit diagram showing a hydraulic circuit in the automatic transmission according to the embodiment.
FIG. 3 is a flowchart showing the operation of the embodiment.
FIG. 4 is a timing chart showing the operation of the same embodiment.
FIG. 5 is a flowchart showing an operation in the second mode of the present invention.
FIG. 6 is a timing chart showing the operation of the same embodiment.
FIG. 7 is a diagram showing an operation in each state of the embodiment;
FIG. 8 is a timing chart showing the operation of a conventional clutch control device.
FIG. 9 is a timing chart showing the operation of another conventional example.
[Explanation of symbols]
1 Clutch control device 2 Automatic transmission 11 Manual valve (manual valve)
12 Pressure regulating valve 13 Clutch engagement means 14 Hydraulic circuit 21 Control unit 24 Range position detection unit 26 Pressure regulation valve control unit 27 Oil temperature detection unit

Claims (4)

Clutch when the hydraulic pressure of the oil from the oil pump that is driven during engine operation, is transmitted through the opening and closing being controlled regulating valve connected in series to the manual valve and the manual valve in conjunction with the operation of the select lever In the clutch control method of the automatic transmission to which is engaged,
The pressure regulating valve which is maintained in the open state to the oil pump non-operation due to engine stop, thereby closing operation on the basis of the start of the oil pump with the engine start, the manual valve in response to operation of said select lever A clutch control method characterized by starting valve opening control of the pressure regulating valve after the valve is opened. The execution of the closing operation of the pressure regulating valve based on the start of the oil pump and the valve opening control of the pressure regulating valve based on the opening operation of the manual valve is determined based on an increase in the temperature of the oil. The clutch control method according to claim 1. Clutch when the hydraulic pressure of the oil from the oil pump that is driven during engine operation, is transmitted through the opening and closing being controlled regulating valve connected in series to the manual valve and the manual valve in conjunction with the operation of the select lever In the clutch control device for an automatic transmission to which
Valve closing means for closing the pressure regulating valve maintained in an open state when the oil pump is not driven due to engine stop based on starting of the oil pump accompanying engine start ;
Valve opening control means for starting valve opening control of the pressure regulating valve after the manual valve is opened according to the operation of the select lever;
A clutch control device comprising: 4. The clutch control device according to claim 3, further comprising determination means for determining execution of the valve closing means and the valve opening control means based on a temperature rise of the oil.

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