JP2000283284A - Shock reduction method at time of selector operation of automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the transmission of torque fluctuation to a drive wheel by connecting other transmission path connection means prior to an electronic control transmission means and suppressing torque capacity of an electronic control transmission path connection means to a low value until the connection is completed when a selector is changed and operated from a non-running position to a running position. SOLUTION: In a control means 22, a rear step clutch 16 is released to suppress torque capacity of the rear step clutch 16 to a small value until the completion of the connection of a front step clutch 18 is detected after a selector is operated and changed to a running position. After on - off connection of the front step clutch 18 is completed, slide of the rear step clutch 16 for electronic control is gradually reduced or torque capacity is gradually increased. Torque fluctuation of the front step clutch 18 can escape by the rear step clutch 16 according to this configuration, thereby preventing the transmission of torque fluctuation to a drive wheel 4 when the front step clutch 18 is connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reducing a shock at the time of operating a selector of an automatic transmission, and more particularly to a method of reducing a shock at the time of operating a selector of an automatic transmission which secures a feeling at the time of a change operation of a selector.

[0002]

2. Description of the Related Art In a vehicle such as an automobile or a motorcycle, a plurality of transmission path connecting / disconnecting means (clutch, brake, etc.) for releasing / connecting the transmission path to a transmission path from a power source such as an engine or a motor to driving wheels. ), At least one of the transmission path connecting / disconnecting means is an electronic control transmission path connection means capable of electronically adjusting the torque capacity and causing a slip during the connection operation, and when the selector is in the non-running position, at least the electronic control transmission path connection means is provided. While one or more of the other transmission path connection means other than the transmission path connection means releases the transmission path in the released state,
When the selector is in the traveling position, there is an automatic transmission in which the other transmission path connecting means connects the transmission path while the electronic control transmission path connecting means is substantially connected.

In this automatic transmission, when the selector is changed from a non-traveling position (neutral: N, parking: P) to a traveling position (drive: D, etc.), the occurrence of a shock at the time of operating the selector is considered. In order to prevent this, in the case of a hydraulic automatic stepped transmission, an accumulator is provided in the hydraulic circuit, etc., so that the rise of hydraulic pressure mechanically applied to various transmission path connecting means (clutch, brake, etc.) is moderated. We are taking measures.

[0004] As a control device for such an automatic transmission, for example, Japanese Patent Application Laid-Open No. 8-74892 and Japanese Patent Application Laid-open No.
72353 and JP-A-63-203947. Japanese Patent Application Laid-Open No. H8-74892 discloses that, when starting a vehicle, the control gain of the clutch pressure is increased until the source pressure of the hydraulic circuit is increased to reduce fluctuations in the clutch pressure, and the torque capacity of the starting clutch is reduced. To prevent fluctuations and reduce shock. JP-A-9-72
Japanese Patent Application Publication No. 353 discloses that torque capacity is determined by a torque capacity determining means based on a torque capacity correction value and a basic torque capacity to absorb a torque fluctuation shock. Japanese Unexamined Patent Application Publication No. 63-203947 discloses a method in which excessive hydraulic pressure adjusted by a shock reducing means at the time of operating a selector is controlled at least by a torque reflection signal and a shift excessive state reflection signal. In this case, too, the excessive engagement hydraulic pressure is prevented from largely deviating from the set value.

[0005]

In an automatic transmission, when the occurrence of a shock at the time of operating a selector is taken by mechanical means, it is difficult to cope with various changes in the operating atmosphere and a large occupancy is required. Space was needed.

For this reason, as a trend of automatic transmissions, there is a tendency to replace the above mechanical means with electronic control means. However, in this case, only the transmission path connecting means of the automatic transmission is electronically controlled as it is, and it is necessary to take measures against the shock at the time of operating the selector for all the transmission path connecting means. Even if only measures are taken to prevent the shock at the time of operating the selector, the effect is limited, so that the feeling at the time of operating the selector cannot be sufficiently ensured.

Analysis of the shock at the time of operation of the selector at the time of operation of the selector has revealed that the occurrence of the shock at the time of operation of the selector depends on the connection state of the transmission path connecting means connected last. In particular, when the change in the torque capacity of the transmission path connecting means connected last is off-on, the shock at the time of operating the selector appears remarkably.

[0008] This is because the torque capacity of the other transmission path connecting means is already large, and the torque fluctuation generated when connecting the transmission path connecting means is applied to the drive wheels and the like via the other transmission path connecting means. This is because it is transmitted, and therefore, the feeling of the driver and the passenger is reduced.

As shown in FIG. 9, the torque capacity of the electronic control transmission path connecting means is set by a clutch operation amount (connection operation amount). Further, the torque capacity of the transmission path connecting means other than the electronic control transmission path connecting means is set by the clutch operation amount as shown in FIG. As shown in FIG. 11, at the same time as the operation of the selector, the torque capacity of the electronic control transmission path connecting means is increased, and the torque capacity of the other transmission path connecting means is changed from off to on, thereby obtaining the electronic control transmission path. If the torque capacity of the connecting means becomes large before the connection of the other transmission path connecting means is completed, the electronic control transmission path connecting means transmits the torque fluctuation when the other transmission path connecting means connects to the drive wheels. As a result, there is an inconvenience that a shock occurs when the selector is operated.

[0010]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, the present invention provides a transmission path from a power source of a vehicle to a driving wheel, wherein a plurality of transmission paths intermittently open and connect the transmission path. At least one of the transmission path connecting / disconnecting means is an electronically controlled transmission path connection means capable of electronically adjusting the torque capacity and causing a slip during the connection operation, and wherein the selector is at least in the non-traveling position. While one or more of the other transmission path connection means other than the control transmission path connection means releases the transmission path in the release state, the selector is in the traveling position and the other transmission path connection means connects the transmission path in the connection state. In the method for reducing a shock at the time of operating a selector of an automatic transmission, wherein the electronic control transmission path connecting means is substantially connected to the electronic control transmission path connecting means, the selector is operated from a non-travel position When the position is changed, the other transmission path connection means is connected before the electronic control transmission path connection means, and the electronic control transmission path connection means is connected until the connection of the other transmission path connection means is completed. Is characterized in that the torque capacity is suppressed to be low.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, when a selector is changed from a non-traveling position to a traveling position, another transmission path connection means is connected before the electronic control transmission path connection means,
Since the torque capacity of the electronic control transmission path connection means is suppressed to a low level until the connection of the other transmission path connection means is completed, even if the change in the torque capacity of the other transmission path connection means is off-on, The torque fluctuation when the other transmission path connection means is connected can be released by the electronic control transmission path connection means having a low torque capacity and a large slip, so that the torque fluctuation is not transmitted to the drive wheels, Shock at the time of operating the selector can be reduced to ensure a feeling for the driver and the passenger.

After the off-on connection of the other transmission path connection means is completed, the slip of the electronic control transmission path connection means is gradually reduced or the torque capacity is gradually increased, so that the electronic control is performed. It is possible to prevent occurrence of a shock when the transmission path connecting means itself operates the selector.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; 1 to 3 show a first embodiment of the present invention. In FIG. 2, reference numeral 2 denotes a power source mounted on a vehicle (not shown), and reference numeral 4 denotes drive wheels. The power source 2 includes an engine and a motor. An automatic transmission 6 is provided on a transmission path from the power source 2 to the drive wheels 4.

The automatic transmission 6 is provided with a transmission 8 for converting the driving force from the power source 2. The transmission 8 includes a driving pulley 10, a driven pulley 12, and a belt 14 wound around the driving pulley 10 and the driven pulley 12. The transmission unit 8 changes the radius of rotation of the belt 14 by changing the groove width of the driving pulley 10 and the driven pulley 12 relatively, thereby changing the gear ratio steplessly.

In the transmission path from the power source 2 to the drive wheels 4, a plurality of transmission path connecting means (clutches) for releasing and connecting the transmission path in the automatic transmission 6 are provided. At least one of the plurality of transmission path connection units is an electronic control transmission path connection unit (electronic control clutch).

That is, a rear clutch 16 which is an electronic control transmission path connecting means is provided downstream of the transmission unit 8. The rear clutch 16 is capable of electronically adjusting the torque capacity and slipping during the connection operation. The torque capacity of the rear clutch 16 is the same as that of FIG. 9, and is determined by the clutch operation amount (connection operation amount). In addition, in the front stage of the transmission unit 8, the front clutch 1 which is another transmission path connecting means other than the electronic control transmission path connecting means is provided.
8 are provided. The front clutch 18 changes the torque capacity on and off. The torque capacity of the front clutch 18 is the same as in FIG. 10, and is determined by the clutch operation amount.

The rear clutch 16 and the front clutch 18 are connected to control means 22 of a shift control device 20.
The control means 22 includes a selector switch 24 for detecting a position of a selector (not shown), an accelerator pedal switch 26 for detecting a depression state of an accelerator pedal (not shown), and a rear-stage input speed of the rear clutch 16. A rear-stage input rotation speed sensor 28 for detecting a rear-stage output rotation speed. A rear-stage output rotation speed sensor 30 and a front-stage input rotation speed sensor 32 for detecting a front-stage output rotation speed. A front-stage output rotation speed. The sensor 34 is in communication.

The control means 22 inputs various detection signals,
When the selector is changed from a non-traveling position (neutral: N, parking: P) to a traveling position (drive: D, etc.), the first clutch 1 serving as another transmission path connecting means is operated.
8 is a rear clutch 16 which is an electronic control transmission path connecting means.
The torque capacity of the rear clutch 16 is suppressed until the connection of the front clutch 18 is completed. To suppress the torque capacity of the rear clutch 16 to low means that the rear clutch 16 is released,
Alternatively, the torque capacity is actually reduced.

Next, the operation of the first embodiment will be described with reference to the flowchart of FIG. 1 and the time chart of FIG.

When the control means 22 starts the program (step 102), first, it is determined whether the position of the selector is neutral (N) or parking (P) at the non-running position (step 104).
In the case of neutral (N) or parking (P), the first clutch 18 which is another transmission path connecting means is released (step 106), and the second clutch 16 which is the electronic control transmission path connecting means is released. (Step 1
08).

On the other hand, when the position of the selector is changed to the running position (drive: D, etc.) other than the neutral (N) or parking (P) in step 104, the front clutch 18 is moved ahead of the rear clutch 16. (Step 110).

Then, it is determined whether or not a predetermined time has elapsed since the operation of the selector (step 112). If this step 112 is NO, it is determined whether or not the start operation is being performed (step 114). Then, it is determined whether or not the connection of the first clutch 18 has been completed (step 116). As a method of detecting the connection completion of the front clutch 18, for example, it is detected when the front input rotation speed and the front output speed of the front clutch 18 are substantially equal.

If this step 11 is NO, the process proceeds to step 108 to release the rear clutch 16 in order to suppress the torque capacity of the rear clutch 16 to a low level.

However, if step 112 is YES and a predetermined time has elapsed since the operation of the selector, the completion of the connection of the front clutch 18 cannot be determined even after the predetermined time has elapsed. Since it is considered that a failure has occurred in the means, for example, the rear clutch 16 is brought into a half-clutch state or is brought into a connected state after the clutch is connected (step 118).

If the answer to step 114 is NO and the starting operation is performed, it is desired to secure the driving force rather than to prevent the shock at the time of operating the selector. Therefore, the process shifts to step 118 to control the rear clutch 16. This determination during starting may be, for example, during operation of the accelerator pedal or non-operation of the brake pedal.

After the processing in steps 108 and 118, the program ends (step 120).

As a result, after the selector is operated to the traveling position, the rear clutch 16 is released in the sense of suppressing the torque capacity of the rear clutch 16 until the completion of connection of the front clutch 18 is detected. The torque fluctuation can be released by the rear clutch 16, so that the torque fluctuation when the front clutch 18 is connected can be reduced.
As a result, the shock at the time of operating the selector can be reduced, and the feeling for the driver and the passenger can be ensured.

Then, the front clutch 18 is turned on and off.
After the connection is completed, the slip of the electronically controlled rear clutch 16 is gently reduced or the torque capacity is gently increased, whereby the occurrence of a shock when the rear clutch 16 itself operates the selector can be prevented.

FIGS. 4 to 8 show a second embodiment of the present invention.

In the second embodiment, portions having the same functions as those in the above-described first embodiment will be described with the same reference numerals.

The features of the second embodiment are as follows. That is, as a transmission path connecting means other than the electronic control transmission path connecting means, a planetary gear type forward / reverse switching mechanism 202 which is a forward / reverse switching mechanism is provided in front of the transmission unit 8. The planetary gear type forward / reverse switching mechanism 202 is for off-on connection, and has a forward clutch 204 and a reverse brake 206. Further, the planetary gear type forward / reverse switching mechanism 202 and the rear clutch 16 which is an electronic control transmission path connecting means are connected to the control means 22.
The operation is controlled by the hydraulic circuit unit 208 which is in contact with.

As shown in FIG. 7, the hydraulic circuit section 208 includes an oil pump 210, a clutch control valve 212, a forward / reverse switching holding valve 214, a manual valve 216 and a pilot valve 218 communicating with the forward clutch 204 and the reverse brake 206. The clutch includes a clutch solenoid 220 functioning as an actuator and an electronic control clutch pressure control valve 222 communicating with the rear clutch 16.

In the hydraulic circuit section 208, the hydraulic pressure generated by the oil pump 210 is adjusted by the clutch control valve 212, and the planetary gear type forward / reverse switching mechanism 202
And a rear pressure for control of the rear clutch 16, and this pressure is used as the forward / reverse switching holding valve 214 and the manual valve 21.
6 and the original pressure is supplied to the rear clutch 16 via the electronic control clutch pressure control valve 222 while supplying the original pressure to the forward clutch 204 or the reverse brake 206.

In the hydraulic circuit 208, the forward / reverse switching valve 214 and the electronically controlled clutch pressure control valve 222 are actuated by a clutch solenoid 220 as one actuator to regulate the pressure, as shown in FIG. The torque capacity characteristics of the planetary gear type forward / reverse switching mechanism 202 and the rear clutch 16 are set to be shifted from the clutch operation amount (connection operation amount) of the transmission path connecting means. Therefore, depending on the clutch solenoid 220, the rear clutch 16 may be disconnected (disengaged) even when the planetary gear type forward / reverse switching mechanism 202 is connected. Further, the pilot valve 218 is a clutch solenoid 2
20 for generating the original pressure. Manual valve 2
Reference numeral 16 mechanically interlocks with the operation of the selector, and switches the hydraulic pressure to the forward clutch 204 or the reverse brake 206.

In the second embodiment, the control means 22
When the selector is changed from the non-running position to the running position, the planetary gear type forward / reverse switching mechanism 202 is connected before the rear clutch 16 and the planetary gear type forward / backward switching mechanism 2 is connected.
The torque capacity of the rear clutch 16 is actually suppressed to a low level until the connection of No. 02 is completed.

Next, the operation of the second embodiment will be described with reference to the flowchart of FIG. 4 and the time chart of FIG.

When the control means 22 starts the program (step 302), first, it is determined whether the position of the selector is neutral (N) or parking (P) at the non-travel position (step 304).
In the case of neutral (N) or parking (P), the forward clutch 204 or the reverse brake 206 of the planetary gear type forward / reverse switching mechanism 202 which is another transmission path connecting means is set to a releasable clutch operation amount (step 306).

On the other hand, if the position of the selector is changed to the traveling position (drive: D, etc.) other than the neutral (N) or parking (P) in step 304, a predetermined time has elapsed since the operation of the selector. Is determined (step 308). If this step 308 is NO, it is determined whether or not the start operation is being performed (step 310).
Further, it is determined whether the connection of the forward clutch 204 or the reverse brake 206 of the planetary gear type forward / reverse switching mechanism 202 has been completed (step 312). This forward clutch 204 or reverse brake 2
As a method of detecting connection completion 06, for example, it is detected when the previous-stage input rotation speed and the previous-stage output rotation speed of each clutch become substantially equal.

If the answer to step 312 is NO, the torque capacity of the rear clutch 16 is actually reduced (step 314).

However, if step 308 is YES and a predetermined time has elapsed since the operation of the selector, the reason why the completion of connection of the forward clutch 204 or the reverse brake 206 cannot be determined even after the predetermined time has elapsed is as follows. Since it is considered that a malfunction has occurred in the reverse brake 204, the reverse brake 206, or the completion determination means, for example, the rear clutch 16 is brought into a half-clutch state, or is brought into a connected state through clutch connection (step 316).

If the answer to step 310 is YES and the starting operation is performed, it is desired to secure the driving force rather than to prevent the shock at the time of operating the selector. Therefore, the process shifts to step 316 to control the rear clutch 16. This determination during starting may be, for example, during operation of the accelerator pedal or non-operation of the brake pedal.

Then, steps 306, 314, 316
After the processing of (3), the program is terminated (step 31).
8).

As a result, after the selector is operated to the traveling position, the torque capacity of the rear clutch 16 is actually reduced until the connection of the forward clutch 204 or the reverse brake 206 of the planetary gear type forward / reverse switching mechanism 202 is detected. Therefore, the torque fluctuation of the forward clutch 204 or the reverse brake 206 can be released by the rear clutch 16, so that the torque fluctuation of the planetary gear type forward / reverse switching mechanism 202 when the forward clutch 204 or the reverse brake 206 is connected can be reduced. 4, the shock at the time of operating the selector can be reduced, and the feeling for the driver and the fellow passenger can be ensured.

After the on / off connection of the forward clutch 204 or the reverse brake 206 is completed, the slip of the electronically controlled rear clutch 16 is gently reduced, or the torque capacity is gently increased. It is possible to prevent the occurrence of a shock when the clutch 16 itself operates the selector.

In the present invention, the electronic control transmission path connecting means in the first embodiment includes hydraulic transmission path connection means, pneumatic transmission path connection means, electromagnetic powder transmission path connection means, manual clutch and clutch position adjustment. It is possible to use transmission path connecting means or the like to which the means is attached. When the torque capacity of the planetary gear type forward / reverse switching mechanism in the second embodiment can be controlled in the same manner as the electronic control transmission path connecting means, a planetary gear type forward / backward switching mechanism is used as the electronic control transmission path connecting means. be able to. Furthermore,
As the automatic transmission, a stepped automatic transmission, a continuously variable transmission, an automated manual transmission, or the like can be used.

[0046]

As is apparent from the above detailed description, according to the present invention, when the selector is changed from the non-traveling position to the traveling position, other transmission path connecting means other than the electronic control transmission path connecting means are connected. By connecting before the electronic control transmission path connecting means and suppressing the torque capacity of the electronic control transmission path connecting means low until the connection of the other transmission path connecting means is completed, the torque capacity of the other transmission path connecting means is reduced. Even if the change is off-on, it is possible to escape the torque fluctuation when the other transmission path connection means is connected by the electronic control transmission path connection means having a small torque capacity and a large slip, In addition, the torque fluctuation is not transmitted to the driving wheels, and the shock at the time of operating the selector can be reduced to ensure the feeling for the driver and the fellow passenger.

[Brief description of the drawings]

FIG. 1 is a flowchart of a selector operation shock reduction control.

FIG. 2 is a system configuration diagram of a shift control device.

FIG. 3 is a time chart of a shock reduction control during selector operation.

FIG. 4 is a flowchart of a selector operation-time shock reduction control in a second embodiment.

FIG. 5 is a system configuration diagram of a shift control device according to a second embodiment.

FIG. 6 is a time chart of a selector operation-time shock reduction control in the second embodiment.

FIG. 7 is a configuration diagram of a hydraulic circuit unit according to a second embodiment.

FIG. 8 is a diagram of a torque capacity in the second embodiment.

FIG. 9 is a diagram of the torque capacity of the electronic control transmission path connection means.

FIG. 10 is a diagram of a torque capacity of another transmission path connecting means.

FIG. 11 is a time chart of a conventional shift control.

[Explanation of symbols]

 Reference Signs List 2 power source 4 drive wheel 6 automatic transmission 16 rear clutch 18 front clutch 20 shift control device 22 control means 24 selector switch 26 accelerator pedal switch

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 3D041 AA53 AB01 AC11 AC20 AD10 AD22 AD23 AD31 AE16 AE22 AF01 3J052 AA01 CA07 CB02 LA01

Claims (6)

[Claims] 1. A transmission path from a power source of a vehicle to a driving wheel is provided with a plurality of transmission path connecting / disconnecting means for releasing / connecting the transmission path, and at least one of the transmission path connecting / disconnecting means electronically has a torque capacity. And an electronically controlled transmission path connecting means that can be adjusted and cause slippage during the connection operation, and at least one of the transmission path connecting means other than the electronically controlled transmission path connecting means is released when the selector is in the non-traveling position. An automatic transmission in which the transmission path is released while the selector is in the traveling position and the other transmission path connection means is connected and the electronic control transmission path connection means is substantially connected when the selector is in the running position. In the method for reducing shock at the time of operating the selector, the electronic control unit may control the other transmission path connecting means when the selector is changed from the non-travel position to the travel position. Connecting the transmission path connecting means before the transmission path connecting means, and suppressing the torque capacity of the electronic control transmission path connecting means to a low level until the connection of the other transmission path connecting means is completed; Shock reduction method. 2. A torque capacity characteristic with respect to a connection operation amount of a transmission path between the other transmission path connection means and the electronic control transmission path connection means is shifted, and the other transmission path connection means is connected to the electronic control transmission path. The path connection means sets a connection operation amount of a transmission path to be released, and the other transmission path connection means and the electronic control transmission path connection means are operated by the same actuator. Shock reduction method when operating the selector of an automatic transmission. 3. The shock of the automatic transmission according to claim 2, wherein one of the electronic control transmission path connecting means and the other transmission path connecting means is a forward / reverse switching mechanism. Reduction method. 4. The method according to claim 2, wherein one of the other transmission path connecting means is a forward / reverse switching mechanism. 5. The automatic transmission according to claim 1, wherein when the driver is performing a start operation, control for suppressing the torque capacity of the electronic control transmission path connection means to be low is stopped. To reduce the shock when operating the selector. 6. The automatic transmission according to claim 1, wherein when a predetermined time has elapsed since the operation of the selector, the control for suppressing the torque capacity of the electronic control transmission path connecting means to be low is stopped. Shock reduction method when operating the machine selector.