JPH0727218A - Select chock reduction device for automatic transmission - Google Patents

Abstract

PURPOSE:To reduce select shock by so controlling that operation of a solenoid valve is switched repeatedly between an ON condition and an OFF condition based on time counted by a timer means under the condition that an engine speed is a specified value or more. CONSTITUTION:An engine speed is detected by a detection means 47 by the use of an electronic control unit ECU. Under the condition that the detected engine speed is a specified value or more, operation of a solenoid valve SOL2 is so controlled that an ON condition and an OFF condition are repeated based on time counted by a timer means 49. Transmission operation is thus completed with certainty before hydraulic pressure to be applied to a clutch member or a brake member reaches a line pressure. Select shock can be reduced when operation is shifted from a P range to an N range in the case that the engine speed is higher than the specified value.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a select shock reducing device for an automatic transmission for a vehicle.

[0003]

2. Description of the Related Art Conventionally, as an automatic transmission for a vehicle, one disclosed in Japanese Patent Application Laid-Open No. 59-183153 is known. This is because the solenoid valve is actuated and the shift valve is actuated after a predetermined time due to the selection from the P or N range to the traveling range, whereby the clutch member or the brake member is hydraulically actuated and starts to engage. ,result,
That is, it is possible to obtain a shift speed in the driving range.

[0004]

In the above-mentioned conventional apparatus, when the drive range is selected from the P or N range in the idle-up state immediately after the engine is started, the engine speed during idling is higher than a predetermined value. From the start of engagement of the clutch member or the brake member to the end of engagement (shift operation) becomes longer than the normal time. As a result, the hydraulic pressure acting on the clutch member or the brake member may reach the line pressure before the shift operation is completed, which may lead to a large select shock.

Therefore, it is a technical object of the present invention to reduce the selection shock due to the selection from the P or N range to the running range when the engine speed is higher than a predetermined value (in the idle-up state). To do.

[0006]

[Constitution of the invention]

[0007]

The technical means taken in the present invention to solve the above technical problems are as follows: detection means for detecting the engine speed and after selecting from the P or N range to the travel range. Of the solenoid valve based on the time measured by the timer, provided that the engine speed detected by the detector is equal to or greater than a predetermined value. The control means controls so that the ON state in time and the OFF state in the set time based on the clock time are repeated.

[0008]

According to the present invention, the operation of the solenoid valve when the engine speed is higher than the predetermined value is such that the control means repeats the ON state at the set time and the OFF state at the set time. Becomes As a result, the hydraulic pressure acting on the clutch member or the brake member gradually approaches the line pressure, and even if the engine speed is higher than a predetermined value and the time required for the gear shift operation is long, the clutch member or the brake member is not affected. The shift operation is surely completed before the acting hydraulic pressure reaches the line pressure. As a result, when the engine speed is higher than the predetermined value (in the idle-up state), the selection shock due to the selection from the P or N range to the traveling range can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 schematically shows a known three-speed automatic transmission for an automobile, the gear train of which includes a torque converter T, planetary gear mechanisms G1 and G2, and hydraulic clutches C1 and C2 for shifting and hydraulic pressure. Equipped with brakes B1 and B2, one-way clutch F, etc., hydraulic clutch C
1, C2 and operation of each element such as hydraulic brakes B1, B2
The non-actuation is configured to be controlled by the hydraulic control device.

The hydraulic control device is operated in response to a select operation of a shift lever (not shown), a manual valve 13, a primary regulator valve 15, a secondary regulator valve 17, a throttle valve 19, 1-.
2 shift valve 21,2-3 shift valve 23, hydraulic brake B2 control valve 25, cooler bypass valve 27, pump 29 driven by an engine (not shown), cooler 31. The hydraulic clutch C1 includes an accumulator 33, a hydraulic brake B1 accumulator 35, and solenoid valves SOL1 and SOL2.
These respective constituent members are connected to the hydraulic clutches C1 and C2, the hydraulic brakes B1 and B2, etc. as shown in the drawing.
The solenoid valves SOL1. The SOL2 operates the shift valves 21 and 23, respectively, and is controlled to be turned on or off by an electronic control unit ECU described later.

As shown in FIG. 2, the electronic control unit EC
U is connected to the solenoid valves SOL1 and SOL2 and also detects a vehicle speed sensor 41 for detecting a vehicle speed, a shift switch 43 for detecting a select operation position of a shift lever, a throttle sensor 45 for detecting a throttle opening, and an engine speed. Is connected to the rotation sensor 47. The electronic control unit ECU includes a microcomputer and a solenoid drive circuit, and the microcomputer includes a CPU, a ROM, a RAM, a timer (used as a PorN range release timer 49) and the like. The electronic control unit ECU having the above-described configuration is configured so that the RO control is performed until the ignition switch IG is turned on and then turned off.
A program corresponding to the flow chart shown in FIGS. 3 and 4 stored in M is executed by the CPU.

The operation will be described.

In FIG. 3, when the ignition switch IG is turned on, the microcomputer starts executing the program at step 100 shown in FIG.
Initialization required for the program is made at step 10
In step 2, the solenoid valve control routine is executed, in step 103, the shift mode control routine is executed, and in step 104 it is determined whether or not the ignition switch IG is ON, and if "NO" is determined, the ignition control is executed. If the switch switch IG is determined to be OFF, step 10
If the program proceeds to step 5 to end the execution of the program and it is determined to be "YES", it is determined that the ignition switch IG is ON, and the process returns to step 102 to return to each of the steps 10 described above.
The processings of 2 and 103 are repeatedly executed. In addition, step 1
The shift mode control routine of 03 is publicly known. By executing this shift mode control routine, the shift switch signal from the shift switch 43 (shift lever select operation position) and the signal from the vehicle speed sensor (vehicle speed) from the throttle sensor. The solenoid valves SOL1 and SOL2 are operated in the ON state or O depending on the signal of
The hydraulic clutches C1 and C2 and the hydraulic brakes B1 and B2 are operated as shown in FIG. 5 by controlling to the FF state, and the shift mode selected based on the select operation position of the shift lever is obtained.

By the way, in the solenoid valve control routine of step 102, the program shown in the flow chart of FIG. 4 is executed.

In step 111, the RAM register T5
A predetermined value based on the engine speed (solenoid valve S
1st ON time setting of OL2) is read, and step 1
At 12, the engine speed n is detected by the rotation sensor 47.
Is read, and it is determined in step 113 whether or not the NorP range release timer 49 is operating.
If it is determined to be "S", it is determined that the NorP range release timer 49 is operating and the process proceeds to step 115. If it is determined to be "NO", it is determined that the NorP range release timer 49 is not operating and the process proceeds to step 114. .

At step 114, it is judged whether the engine speed n read at step 112 exceeds a predetermined value N1 stored in the RAM, and "YES".
If it is determined that the engine speed n exceeds the predetermined value N1, the process proceeds to step 115. If "NO" is determined, the engine speed n is determined to be the predetermined value N1 or less and the process returns. To be done.

In step 115, the shift switch 43
Shift switch signal from P (R, N, D, 2, L)
Is read, and it is determined in step 116 whether or not the shift switch signal read in step 115 corresponds to the R range of the shift lever select operation position (signal R), and it is determined to be "YES". If so, it is determined that the shift lever select operation position is in the R range and the process proceeds to step 117. If it is determined as "NO", it is determined that the shift lever select operation position is not in the R range and step 131 is performed at NorP. After clearing the range release timer 49, the process returns to step 112. In step 117, the previous shift switch signal corresponds to the N or P range of the shift lever select operation position (signal Nor.
If it is determined to be "NO", it is determined that the shift lever select operation position was in the R range last time, and the process proceeds to step 119. If "YES" is determined, the previous shift is performed. When it is judged that the lever select operation position is in the N or P range, step 118 returns Nor.
The P release timer 49 is started and the process proceeds to step 119.

At step 119, it is determined whether or not the current time t of the NorP range release timer 49 started at step 118 is less than the hydraulic pressure adjustment end time T2 stored in the RAM, and "YES" is determined. If so, it is determined that the current time t has not reached the hydraulic pressure adjustment end time T2, and the process proceeds to step 120. If it is determined to be "NO", it is determined that the current time t has reached the hydraulic pressure adjustment end time T2. And proceed to step 133. In step 133, it is determined whether or not the solenoid valve SOL2 is in the OFF state, and if it is determined "NO", the solenoid valve SO2 is released.
When it is determined that L2 is in the ON state, the solenoid valve SOL2 is turned off in step 134, the process returns to step 112, and if "YES" is determined, it is determined that the solenoid valve SOL2 is in the off state.
Return to 12. In step 120, it is determined whether or not the current time t of the NorP range release timer 49 started in step 118 is less than the hydraulic pressure adjustment start time T1 stored in the RAM. If "YES" is determined, the current time t is determined. When it is determined that the time t has not reached the hydraulic pressure adjustment start time T1, the process returns to step 112, and if "NO" is determined, it is determined that the current time t has reached the hydraulic pressure adjustment start time T1 and step 121 is performed. move on.

In step 121, the solenoid valve S
It is determined whether or not the OL2 is in the OFF state, and "YE
If it is determined to be "S", the solenoid valve SOL2 is turned off.
If it is determined that the state is in progress, the process proceeds to step 122, and "NO"
If it is determined that it is determined that the solenoid valve SOL2 is in the ON state, the process proceeds to step 127.

In step 122, it is judged whether or not the time (t-T1) that has passed since the hydraulic pressure adjustment was started is less than the first ON set time (T5) of the solenoid valve SOL2, and it is judged as "YES". If so, the time that has elapsed since the hydraulic pressure adjustment was started is the solenoid valve SOL.
It is judged that the first ON-setting time of 2 has not come, and the value of the register T5 (first ON-setting time) is read into the register T3 in step 132, and then the solenoid valve SOL2 is turned ON in step 125. The current time t of the NorP range release timer 49 is read into the register Y at step 126, and the process returns to step 112.
That is, step 126 is repeatedly executed as long as it is determined in step 121 that the solenoid valve SOL is in the OFF state, and the OF of the solenoid valve SOL2 is turned off.
In the F state, the value of the register Y (the current time t of the NorP range release timer 49) is updated at any time, and when the solenoid valve SOL2 is turned on, the solenoid valve SOL is turned on at step 126. If it is determined that it is, the process proceeds to step 127 and step 12
6 is not executed, so the value of register Y (No
The current time t) of the rP range release timer 49 will not be updated. Therefore, the register Y has the N value when the sononoid valve S0L2 changes from the OFF state to the ON state.
The time of the orP range cancellation timer 49 is read. Further, if "NO" is determined in the step 122, it is determined that the time elapsed after the hydraulic pressure adjustment is started is the first ON setting time of the solenoid valve SOL2, and the process proceeds to the step 123.

In step 127, it is judged whether or not the time (t-T1) that has elapsed since the hydraulic pressure adjustment was started is less than the first ON set time (T5) of the solenoid valve SOL2, and it is judged "YES". If so, the time that has elapsed since the hydraulic pressure adjustment was started is the solenoid valve SOL.
When it is judged that the second ON time has not come, the current time t of the NorP range release timer 49 is read into the register X in step 131, and the process returns to step 112. That is, step 131 is repeatedly executed as long as the solenoid valve SOL is determined to be in the ON state in step 121, and the solenoid valve SOL2 is turned off.
In the N state, the value of the register X (the current time t of the NorP range release timer 49) is updated at any time, and when the solenoid valve SOL2 is turned off, the solenoid valve SOL is turned off at step 126.
Since it is determined that the state is in progress and the process proceeds to step 122 and step 131 is not executed, the value of register X (current time t of NorP range release timer 49) is not updated. Therefore, the time of the NorP range release timer 49 when the solenoid valve SOL2 is changed from the ON state to the OFF state is read into the register X. Further, if "NO" is determined in the step 127, it is determined that the time elapsed after the hydraulic pressure adjustment is started is the first ON setting time of the solenoid valve SOL2, and the process proceeds to the step 128.

In step 128, the solenoid valve S
It is determined whether or not the elapsed time (XY) from when the OL2 is switched from the OFF state to the ON state is less than the ON set time (T3) after the first or second time of the solenoid valve SOL2, and it is determined as “YES”. If judged, solenoid valve S
It is judged that the elapsed time from when the OL2 is switched from the OFF state to the ON state has not reached the ON set time after the first or second time of the solenoid valve SOL2, and the step 131
If it is judged "NO", the solenoid valve SOL
The time that has elapsed from the time when 2 was switched from the OFF state to the ON state is ON after the first or second solenoid valve SOL2.
When it is judged that the set time has come, in step 129, the map stored in the RAM in the register T4 is changed to Nor.
At step 130 after reading the OFF setting time after the first time of SOL2 corresponding to the current time t set so as to be gradually increased by the duty ratio as a function of the current time t of the P range release timer 49 Solenoid valve SO
The L2 is turned off and the routine proceeds to step 131. In step 123, the elapsed time (Y-X) after the solenoid valve SOL2 is changed from the ON state to the OFF state is the OFF set time (T-T) after the first time of the solenoid valve SOL2.
It is determined whether or not it is less than 4), and if it is determined to be "YES", the solenoid valve SOL2 is turned off from the on state.
Solenoid valve SOL
If it is judged that the OFF setting time has not come after the first time in step 2, and if "NO" is judged, the elapsed time since the solenoid valve SOL2 is changed from the ON state to the OFF state is one of the solenoid valve SOL2. It is judged that it is the OFF set time after the first time and step 12
In step 4, the SOL2 corresponding to the current time t is set so as to gradually decrease from the map stored in the register T3 in the RAM by the duty ratio as a function of the current time t of the NorP range release timer 49. The second and subsequent times read the ON set time, and proceed to step 125.

From the above description, the solenoid valve control routine starts and the steps 111 and 11 are started.
2,114,115,116,117,118,11
9, 120, 121 are executed in this order, and the step 122 is executed.
Is executed for the first time, the time that has elapsed since the hydraulic pressure adjustment was started is close to "0 hour" without fail and has not always exceeded the first ON set time of the solenoid valve SOL2. The sequence is executed in order, the process returns to step 112, and when step 121 is executed next, the solenoid valve SOL is executed at step 125.
Since step 2 is on, step 127 is executed. The solenoid valve control routine starts, and steps 111, 112, 114, 115, 11 are started.
6,117,118,119,120,121,12
2,132,125,126,112,114,11
5,116,117,118,119,120,121
When step 127 is executed for the first time, the time that has elapsed since the hydraulic pressure adjustment was started is close to "0 hour" and the solenoid valve SOL2 is not always set to the first ON set time or longer. Therefore, step 131 is executed, the process returns to step 112, and step 1
Steps 131, 112, 114, 115, 11 until the time elapsed since the hydraulic pressure adjustment started in 27 becomes equal to or longer than the first ON set time of the solenoid valve SOL2.
6,117,118,119,120,121,127
Is repeated in this order (solenoid valve SOL
2 first ON state). Steps 131, 112, 11
4,115,116,117,118,119,12
0, 121, 127 are repeatedly executed in this order, and the time elapsed after the hydraulic pressure adjustment is started in step 127 becomes equal to or longer than the first ON set time of the solenoid valve SOL2 (end of the first ON state of the solenoid valve SOL2). And when the solenoid valve SOL2 is OFF,
Since the elapsed time from entering the N state is always the first ON set time or more, steps 129, 130, 13
The processing is executed in the order of 1, and the process returns to step 112. When the first ON state of the solenoid valve SOL2 is finished and the step 121 is executed again, the solenoid valve SOL2 is turned off in step 129.
22 is executed, but the time elapsed after the hydraulic pressure adjustment is started is always the first ON setting time of the solenoid valve SOL2 since the first ON state is ended. Therefore, step 123 is executed, and the solenoid valve is operated in step 123. The first OFF time of the solenoid valve SOL2, which is the elapsed time from when the SOL2 is turned off to when it is turned off.
Steps 126, 112, 11 until the set time is exceeded
3,114,115,116,117,118,11
9, 120, 121, 122, 123 are repeatedly executed in this order (the first OFF state of the solenoid valve SOL2). Steps 126, 112, 113, 114, 11
5,116,117,118,119,120,12
1, 122, 123 are repeatedly executed in this order, and at step 123, the solenoid valve SOL2 is changed from the ON state to the OF state.
Solenoid valve SO elapsed time from reaching F state
When the first OFF setting time of L2 is exceeded (when the first OFF state of solenoid valve SOL2 ends), step 1 is performed.
24, 125, 126 are executed in this order, and step 112 is executed.
Return to. When the first OFF state of the solenoid valve SOL2 is finished and the step 121 is executed again, the solenoid valve SOL2 is turned on in the step 125, so the step 127 is executed, but it has elapsed since the hydraulic pressure adjustment was started. Since the first ON state has been completed for the time, be sure to turn ON the solenoid valve SOL2 for the first time.
Since it is the set time or more, step 128 is executed, and steps 131, 112, until the elapsed time after the solenoid valve SOL2 is switched from the OFF state to the ON state at the step 128 is the second ON set time of the solenoid valve SOL2 or more. 113, 114, 115, 116, 1
17,118,119,120,121,127,12
Repeatedly in the order of 8 (solenoid valve SOL
2 second ON state). Steps 131, 112, 11
3,114,115,116,117,118,11
9, 120, 121, 127, 128 are repeatedly executed in this order, and the elapsed time after the solenoid valve SOL2 is changed from the OFF state to the ON state in step 128 becomes the second ON setting time of the solenoid valve SOL2 or more (solenoid valve SOL2). (The second ON state of the valve SOL2 ends)
Then, steps 129, 130, 131 are executed in this order, and the process returns to step 112.

The second time O of the solenoid valve SOL2
From the FF state, execute the same as the first OFF state,
Also, from the third ON state of the Renoid valve SOL2, it is executed in the same manner as the second ON state. As a result, the operation of the solenoid valve SOL2 is performed in the ON state and the O state in which the ON set time is gradually shortened as shown in FIG. 6 due to the repeated execution of steps 120 to 132.
The OFF state in which the FF setting time gradually becomes longer is repeated.

Therefore, in the idle-up state immediately after the engine is started (the engine speed is higher than a predetermined value), when the P range to the R range is selected, the hydraulic clutch C2 is acted as shown in FIG. The hydraulic pressure to be applied is gradually increased, and as a result, the gear shift operation is surely completed before the hydraulic pressure acting on the hydraulic clutch C2 reaches the line pressure. This allows
The selection shock when selecting from the P range to the R range in the idle up state is reduced.

Further, in the idle-up state immediately after the engine is started (the engine speed is higher than a predetermined value), N
When the range is selected to the R range, as shown in FIG. 8, the hydraulic pressure acting on the hydraulic clutch C2 is gradually increased, and as a result, the hydraulic pressure acting on the hydraulic clutch C2 becomes the line pressure. The speed change operation will be completed without fail before reaching. This reduces the selection shock when selecting from the N range to the R range in the idle-up state.

[0028]

According to the present invention, P when the engine speed is higher than a predetermined value (in the idle-up state)
Alternatively, the operation of the solenoid valve by selecting from the N range to the traveling range is performed by the control means at the set time O.
The N state and the OFF state at the set time are repeated. As a result, the hydraulic pressure acting on the clutch member or the brake member gradually approaches the line pressure, and even if the engine speed is higher than a predetermined value and the time required for the gear shift operation is long, the clutch member or the brake member is not affected. The gear shift operation can be surely completed before the acting hydraulic pressure reaches the line pressure. As a result, it is possible to reduce the select shock when the engine speed is higher than the predetermined value. Also, since the operation of the solenoid valve is controlled to reduce the select shock, it is not necessary to add a special hydraulic circuit etc. to reduce the select shock.
It can be easily applied to conventional automatic transmissions and has excellent versatility.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an automatic transmission in which a control device according to the present invention is adopted.

FIG. 2 is a circuit diagram of a control device according to the present invention.

FIG. 3 is a diagram showing a flow chart of the control device according to the present invention.

FIG. 4 is a diagram showing a flow chart of the control device according to the present invention.

5 is a diagram showing an operation of a clutch member or a brake member in a shift mode of the automatic transmission of FIG.

FIG. 6 is a diagram showing an operation of a solenoid valve based on the flow chart of FIG.

7 is a flow chart based on the P range of FIG. 4 to R;
It is a figure which shows the hydraulic pressure of a clutch member or a brake member at the time of selecting to a range, and the relationship of time.

FIG. 8 is an N range to R range based on the flow chart of FIG.
It is a figure which shows the hydraulic pressure of a clutch member or a brake member at the time of selecting to a range, and the relationship of time.

[Explanation of symbols]

 47 Rotation Sensor (Detection Means) 49 NorP Range Release Timer (Timer Means) ECU Electronic Control Unit (Control Means) SOL2 Solenoid Valve

Claims (1)

[Claims] 1. A detection means for detecting an engine speed,
Based on the timer means for counting the elapsed time after being selected from the P or N range to the running range, and the time measured by the timer means provided that the engine speed detected by the detecting means is a predetermined value or more. The solenoid valve is turned on for a set time based on the above-mentioned clock time.
And a control means for controlling such that the OFF state is repeated for a set time based on the time count time and the time count time.