JP3265745B2 - Shift progress detection device for automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a shift progress state of an automatic transmission.

[0002]

2. Description of the Related Art An automatic transmission shifts to another gear position (gear position) by switching operation of a plurality of friction elements (clutch, brake, etc.) selectively hydraulically operated by line pressure. However, if the line pressure is not properly controlled during the shift, if it is too high, a large shift shock will be caused, and if it is too low, the friction element will wear out prematurely. Therefore, in the control of the automatic transmission such as the line pressure control at the time of shifting, it is inevitable to detect the shift progress state.

As a conventional shift progress detecting device, for example, a shift progress detecting device disclosed in Japanese Patent Laid-Open Publication No. 1-193445 is known.

In this power unit, a rotation sensor for detecting a turbine rotation speed of a torque converter, that is, a torque converter output rotation speed (transmission input rotation speed), is provided in a power unit in which an engine, a torque converter and an automatic transmission are sequentially coupled in tandem. From the ratio of the transmission input rotation speed and the transmission output rotation speed thus detected, that is, from the effective gear ratio of the automatic transmission, the inertia phase during gear shifting (the effective gear ratio is changed from the gear ratio before gear shifting to the gear after gear shifting). (A period changing toward the ratio). Incidentally, the detection result is used for learning control of the line pressure so that the inertia phase time becomes the most suitable length for reducing the shift shock in the automatic transmission.

[0005]

However, in reality, the space between the torque converter and the automatic transmission is so narrow that it is difficult to secure a space for installing the torque converter output rotation sensor. Is not applicable to any automatic transmission.

Further, the shift state detecting device using the torque converter output rotation sensor cannot detect the shift progress state unless the effective gear ratio has changed, and even if the inertia phase during the shift can be detected, the shift state cannot be detected. Since the middle torque phase is when the effective gear ratio has not yet changed, there has been a decisive problem that it cannot be detected.

Therefore, Japanese Patent Laid-Open Publication No. 4-25660 has proposed a method of detecting a transmission output torque and detecting a torque phase and an inertia phase during a shift from the change speed. However, if the shift progress state is detected only from the detected value of the transmission output torque as described above, the torque phase can also be detected, but the detection accuracy is difficult, and there is still room for improvement. I confirmed that there is.

SUMMARY OF THE INVENTION An object of the present invention is to propose a shift progress detecting device for an automatic transmission, which can detect not only an inertia phase during a shift but also a torque phase with high accuracy.

[0009]

According to a first aspect of the present invention, there is provided an apparatus for detecting a shift progress state of an automatic transmission as shown in FIG. A torque detecting means for detecting a torque of a rotating part whose torque changes according to the torque of the rotating part, and at least a torque of the rotating part before shifting of the automatic transmission based on information relating to an input torque of the automatic transmission including an engine speed. A pre-shift torque estimating means that continuously estimates until the start of the torque phase, a pre-shift torque estimated value obtained from both means,
A first torque ratio calculating means for calculating a first torque ratio between the detected torque value and a torque phase determining means for determining start and end of a torque phase based on the first torque ratio. I do.

In this configuration, the pre-shift torque estimating means estimates the torque converter output torque from the engine speed, the transmission output speed, and the pre-shift gear ratio using the inherent characteristics of the torque converter as in the second invention. The pre-shift torque of the rotating portion can be estimated from the torque converter output torque estimated value and the pre-shift gear ratio.

Further, the torque phase determining means may be a third type.
As in the present invention, the start of the torque phase is determined when the first torque ratio reaches the first reference value, and the end of the torque phase is determined when the first torque ratio reaches the second reference value. Good to do.

According to a fourth aspect of the present invention, there is provided a post-shift torque estimating means for estimating a torque of the rotating portion of the automatic transmission after a shift, and a post-shift torque estimated value obtained from the means and torque detection by the torque detecting means. A second torque ratio calculating means for calculating a second torque ratio between the values is added to the first invention, and the torque phase determining means determines the end of the torque phase from the second torque ratio instead of the first torque ratio. It is characterized in that it is configured to determine.

According to a fifth aspect of the present invention, as shown in FIG. 1B, there is provided an apparatus for detecting a shift progress state of an automatic transmission.
A torque detecting means for detecting a torque of a rotating part in which a torque changes according to a shift progress state of the automatic transmission; and a torque detecting means for detecting a torque of the automatic transmission based on input torque of the automatic transmission including an engine speed before a shift of the automatic transmission. A pre-shift torque estimating means for continuously estimating the torque of the rotating part at least until the start of the torque phase; and a first torque ratio between the pre-shift torque estimated value obtained from these two means and the detected torque value. Estimating the torque of the rotating portion after the shift of the automatic transmission at least until the start of the torque phase based on first torque ratio calculating means to be calculated and information on the input torque of the automatic transmission including the engine speed. A second post-shift torque estimating means, and a second torque ratio between a post-shift torque estimated value obtained from the means and a torque detected value by the torque detecting means. A second torque ratio calculating means for output,
An inertia phase determining means for determining the start and end of the inertia phase based on the first and second torque ratios.

The pre-shift torque estimating means in this configuration estimates the torque converter output torque from the engine speed, the transmission output speed, and the pre-shift gear ratio using the inherent characteristics of the torque converter as in the sixth invention. Preferably, the pre-shift torque of the rotating portion is estimated from the torque converter output torque estimated value and the pre-shift gear ratio.

Further, as in the seventh invention, the above-mentioned post-shift torque estimating means calculates the torque converter output torque from the engine speed, the transmission output speed, and the post-shift gear ratio using the inherent characteristics of the torque converter. It is preferable that the estimated torque converter output torque and the post-shift gear ratio be used to estimate the post-shift torque of the rotating portion.

Further, the inertia phase determining means determines the start of the inertia phase when the first torque ratio reaches the second reference value, as in an eighth aspect of the present invention.
Preferably, the end of the inertia phase is determined when the second torque ratio reaches the third reference value.

According to a ninth aspect of the present invention, as shown in FIG. 1C, there is provided an apparatus for detecting a shift progress state of an automatic transmission.
A torque detecting means for detecting a torque of a rotating portion in which a torque changes according to a shift progress state of the automatic transmission; and a torque detecting means for detecting a torque of the automatic transmission based on information relating to an input torque of the automatic transmission including an engine speed. Post-shift torque estimating means for continuously estimating the torque of the rotating portion at least until the start of the torque phase, and calculating a second torque ratio between the post-shift torque estimated value obtained from these means and the detected torque value And a second torque ratio calculating means for determining a start and an end of the inertia phase from the second torque ratio.

According to the tenth aspect, the post-shift torque estimating means estimates the torque converter output torque from the engine speed, the transmission output speed, and the post-shift gear ratio using the inherent characteristics of the torque converter. And
It is preferable that the post-shift torque of the rotating portion is estimated from the torque converter output torque estimated value and the post-shift gear ratio.

[0019]

In the first invention shown in FIG. 1 (a), the torque detecting means detects the torque of the rotating portion where the torque changes according to the shift progress state of the automatic transmission. The torque of the rotating part before the shift of the automatic transmission is continuously estimated at least until the start of the torque phase based on information related to the input torque of the automatic transmission including the number. Then, the first torque ratio calculating means calculates a first torque ratio between the pre-shift torque estimated value obtained from these two means and the detected torque value, and the torque phase determining means calculates the first torque ratio from the first torque ratio. The start and end of the torque phase during the shift are determined.

In this configuration, the rotating part is not limited to the torque converter output shaft, but may be any rotating part of the automatic transmission, and it is necessary to provide a sensor in relation to the torque converter output shaft for which it is difficult to secure a mounting space. Therefore, the shift progress detecting device according to the first aspect of the invention can be applied to any automatic transmission.

Moreover, the shift progress state detecting device of the first invention detects the shift progress state based on the torque change of the rotating portion basically irrespective of the effective gear ratio of the automatic transmission. The torque phase during the shift without the shift can also be detected.

In addition, when the shift progress state is detected based on the torque change of the rotating portion, the shift progress state is not simply detected based on the torque change rate or the torque change amount. Since the shift progress state is determined based on the first torque ratio between the previous torque estimated value and the first torque ratio, the determination can be performed with high accuracy. Moreover,
Since the estimation of the torque of the rotating portion related to the first torque ratio before shifting is performed continuously at least until the start of the torque phase based on information on the input torque of the automatic transmission including the engine speed, the torque Even when the driver operates the accelerator pedal until the start of the phase, the start and end of the torque phase can be accurately determined.

In this configuration, the pre-shift torque estimating means uses a torque converter output characteristic based on an engine speed, a transmission output speed, and a pre-shift gear ratio as described in the second aspect of the invention. It is practical to estimate the torque, and to estimate the pre-shift torque of the rotating part from the torque converter output torque estimated value and the pre-shift gear ratio, and it is a meaning of performing the estimation accurately. Is preferred.

Further, the torque phase determining means may be a third type.
As in the present invention, the start of the torque phase is determined when the first torque ratio becomes the first reference value, and the end of the torque phase is determined when the first torque ratio becomes the second reference value. The configuration is preferable in the sense of facilitating the determination.

According to a fourth aspect of the present invention, there is provided a post-shift torque estimating means for estimating a torque of the rotating portion after a shift of the automatic transmission, and a post-shift torque estimated value obtained from the means and the torque detecting means. Second between torque detection values
A second torque ratio calculating means for calculating a torque ratio;
In addition to the above, even when the torque phase determination means is configured to determine the end of the torque phase from the second torque ratio instead of the first torque ratio, the same operation and effect can be achieved.

In the fifth invention shown in FIG. 1 (b), the torque detecting means, the pre-shift torque estimating means, and the first torque ratio calculating means each function in the same manner as in the first invention, and perform the pre-shift gear change with respect to the rotating portion. A first torque ratio between the estimated torque value and the detected torque value is calculated. Then, the post-shift torque estimating means continuously estimates the torque of the rotating portion after the shift of the automatic transmission, at least until the start of the torque phase, based on information relating to the input torque of the automatic transmission including the engine speed. The second torque ratio calculating means calculates a second torque ratio between the post-shift torque estimated value and the torque detected by the torque detecting means. Here, the inertia phase determination means determines the start and end of the inertia phase from the first and second torque ratios.

Also in this configuration, the above-mentioned rotating portion is not limited to the torque converter output shaft, but may be any rotating portion of the automatic transmission, and a sensor is provided in relation to the torque converter output shaft for which it is difficult to secure a mounting space. Since there is no necessity, the shift progress detecting device according to the fifth aspect of the present invention can be applied to any automatic transmission.

In addition, although the shift progress state is detected based on the torque change of the rotating portion, the shift progress state is not simply detected based on the torque change rate or the torque change amount. Since the shift progress state is determined based on the first and second torque ratios between the estimated torque and the estimated torque, the inertia phase can be determined with high accuracy. In addition, the estimation of the torque of the rotating portion related to the first and second torque ratios before and after the shift is continued at least until the start of the torque phase based on the information related to the input torque of the automatic transmission including the engine speed. Therefore, even when the driver operates the accelerator pedal until the start of the torque phase, the start and end of the inertia phase can be accurately determined.

In this configuration, the pre-shift torque estimating means uses the torque converter output characteristic by using the characteristic characteristics of the torque converter based on the engine speed, the transmission output speed, and the pre-shift gear ratio as in the sixth invention. It is practical to estimate the torque and to estimate the pre-shift torque of the rotating portion from the torque converter output torque estimated value and the pre-shift gear ratio, and it is also meaningful to accurately perform the estimation. Is preferred in some cases.

Further, the above-mentioned post-shift torque estimating means includes an engine speed, a transmission output speed,
And estimating the torque converter output torque from the post-shift gear ratio using the inherent characteristics of the torque converter, and estimating the post-shift torque of the rotating portion from the estimated torque converter output torque value and the post-shift gear ratio. It is practical to configure, and is preferable in the sense that the estimation is accurately performed.

Further, the inertia phase determining means determines the start of the inertia phase when the first torque ratio has reached the second reference value, as in the eighth invention, and determines whether the second torque ratio is equal to the third torque ratio. It is preferable that the end of the inertia phase is determined when the reference value is reached, from the viewpoint of facilitating the determination.

In the ninth aspect of the present invention shown in FIG. 1C, the torque detecting means, the post-shift torque estimating means, and the second torque ratio calculating means function in the same manner as in the fifth aspect of the present invention, and relate to the rotating part. A second torque ratio between the post-shift torque estimated value and the detected torque value is calculated. Then, the inertia phase determining means calculates, from the second torque ratio,
The start and end of the inertia phase are determined.

Also in this configuration, the above-mentioned rotating part is not limited to the torque converter output shaft, but may be any rotating part of the automatic transmission, and a sensor is provided in relation to the torque converter output shaft for which it is difficult to secure a mounting space. Since there is no necessity, the shift progress detecting device according to the ninth aspect can be applied to any automatic transmission.

In addition, although the shift progress state is detected based on the torque change of the rotating portion, the shift progress state is not simply detected based on the torque change rate or the torque change amount. Since the shift progress state is determined based on the second torque ratio between the estimated torque and the estimated torque, the inertia phase can be determined with high accuracy. In addition, since the estimation of the torque of the rotating portion related to the second torque ratio after shifting is performed continuously at least until the start of the torque phase based on information on the input torque of the automatic transmission including the engine speed. Even when the driver operates the accelerator pedal until the start of the torque phase, the start and end of the inertia phase can be accurately determined.

Also in this configuration, the post-shift torque estimating means uses the torque converter specific characteristic based on the engine speed, the transmission output speed, and the post-shift gear ratio as in the tenth aspect. It is practical to estimate the output torque and to estimate the post-shift torque of the rotating portion from the torque converter output torque estimated value and the post-shift gear ratio, and to perform the estimation accurately. Preferred in meaning.

[0036]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 shows an embodiment of a shift state detecting apparatus according to the present invention, which is a power train of a vehicle. The power train is composed of an engine 1, a torque converter 2, and an automatic transmission 3.
And tandem coupling with The automatic transmission 3 includes a control valve 4, which incorporates a plurality of solenoids in addition to various valves such as a shift control valve and a hydraulic circuit that communicates between the valves, and controls the duty of the solenoid. , ON and OFF control, the automatic transmission 3 is controlled to shift as predetermined.

In order to perform the shift control, each solenoid of the control valve 4 is duty-controlled or turned on and off by a controller 5, and this is performed. Includes a signal from a throttle sensor 6 for detecting a throttle opening Th of the engine 1, a signal from an engine rotation sensor 7 for detecting an output rotation speed Ne of the engine 1,
A signal from a transmission output torque sensor 8 for detecting the output torque To of the automatic transmission 3 and a signal from a transmission output rotation sensor 9 for detecting the output rotation number No of the automatic transmission 3 are input.

The controller 5 performs the shift control based on the calculation result based on the input information as follows. That is, the vehicle speed V is calculated from the transmission output rotational speed No, and the throttle opening Th is used to determine the vehicle speed V in the first to fourth speeds based on the table data in FIG. To find the right gear. Then, the solenoid of the control valve 4 is selectively turned on so as to obtain the preferred gear, and the automatic transmission 3 is shifted from the currently selected gear to the preferred gear.

The controller 5 further executes a control program shown in FIGS. 3 to 7 to detect a shift progress state aimed at by the present invention. FIG. 3 is a main routine executed by a periodic interruption every 10 msec, for example, and FIGS. 4 to 7 are subroutines showing the details of the steps in the main routine. These processes will be described in detail below.

In FIG. 3, first, at step 11, the engine output speed Ne, the transmission output speed No, the engine throttle opening Th, and the transmission output torque To are respectively read. Next, at step 12, a shift determination is performed, and this determination is made as shown in FIG.

In step 31 of FIG. 4, the vehicle speed V is calculated from the transmission output speed No in the same manner as in the above-described shift control.
Gear position (preferable gear position) from the table data
xt · Gp is obtained. Then, in step 32, it is determined whether or not the shift is performed based on whether or not the preferred gear position Next · Gp and the currently selected gear position (selected gear position) Cur · Gp do not match. . If the shift is to be performed, in step 33, the flag f · sh indicating that the shift is in progress
ift is set to 1 and a flag f indicating the first shift start
Reset init to 0, and reset Timer 0, which measures the time during shifting, to 0. Note that the flag f
The shift is set to 1 during the shift, and is set to 0 in a steady state after the shift. The flag f · init is set to 0 only at the first shift start, and is set to 1 at other times. If it is determined in step 32 that the shift is not performed, step 33 is skipped, and this step 33 is processed only once when a shift command is issued as a result of the shift determination.

In the next step 13 shown in FIG. 3, it is determined from the flag f.shift whether the gear is being shifted or not, and the control proceeds to steps 14 to 20 as long as the gear is being shifted. In step 14, the timer Timer is incremented to measure the time during shifting, and in step 15, the torque ratio is calculated by the processing in FIG.

In FIG. 5, first, at step 41, the transmission output torque To1 before the shift of the automatic transmission is estimated by the following calculation. That is, the transmission output rotational speed No
And the pre-shift gear ratio, the output rotation speed Nt1 of the torque converter 2 (pre-shift turbine speed) before the shift is calculated by multiplying the two, and then this and the engine output speed Ne (the torque converter input rotation). ), The speed ratio of the torque converter 2 is obtained. Then, a torque capacity coefficient and a torque ratio of the torque converter 2 are obtained from the speed ratio based on the inherent characteristics of the torque converter 2. Finally, a torque converter output torque before shift (turbine torque before shift) Tt1 = torque capacity coefficient × The pre-shift turbine torque Tt1 is calculated by the calculation of torque ratio × Ne ² . The pre-shift turbine torque T thus obtained
By multiplying t1 by the gear ratio before shifting, the transmission output torque To1 before shifting can be finally calculated and estimated. Since the transmission output torque To1 before the above-described shift is estimated is that the main routine of FIG. 3 is repeatedly executed by the periodic interruption, it is determined that the shift is in progress in step 13 of FIG. 3 and step 15 is selected. It will be performed continuously for a while.

In the next step 42 in FIG. 5, the transmission output torque To2 after the shift of the automatic transmission is estimated by the following calculation. That is, the transmission output rotational speed No
The output rotation speed Nt2 of the torque converter 2 after the shift (the turbine speed after the shift) Nt2 is calculated by multiplying the output speed and the gear ratio after the shift, and then the engine output rotation speed Ne (the torque converter input rotation speed). ), The speed ratio of the torque converter 2 is obtained. Then, a torque capacity coefficient and a torque ratio of the torque converter 2 are obtained from the speed ratio based on the inherent characteristics of the torque converter 2, and finally, a post-shift torque converter output torque (post-shift turbine torque) Tt2 = torque capacity coefficient × the calculation of the torque ratio × Ne ^2, calculates the post-shift turbine torque Tt2. The post-shift turbine torque T thus obtained
By multiplying t2 by the post-shift gear ratio, it is possible to finally calculate and estimate the transmission output torque To2 after the shift. The transmission output torque To2 after the above-mentioned shift is estimated because the main routine of FIG. 3 is repeatedly executed by the periodic interruption, so that it is determined that the shift is being performed in step 13 of FIG. 3 and step 15 is selected. It will be performed continuously for a while.

In step 43 of FIG. 5, the ratio of the transmission output torque estimated value To1 before transmission to the transmission output torque To detected by the torque sensor 8 in FIG. 2, that is, the first torque ratio T1 = To1 / To is calculated. calculate. Incidentally, the torque sensor 8 has an output characteristic as shown in FIG. 8, for example, and can detect the transmission output torque To from the output of the torque sensor. In the next step 44, the ratio of the transmission output torque estimated value To2 to the transmission output torque detection value To2, that is, the second torque ratio T2 = To2 / To is calculated. It returns to step 16 of No. 3.

In step 16 of FIG. 3, the flag f · in
It is checked whether or not it is the first shift start from it, and if it is the first shift start, the flag f · ini is set in steps 17 and 18.
t to 1 and a shift progress state detection flag f · tc
Reset t to zero. By setting the flag f.init to 1 in step 17 as described above, step 1
In step 6, steps 17 and 18 are skipped, and the processing in these steps is regarded as one time at the start of shifting. The shift progress state detection flag f · tct is set to 1 at the start of the torque phase during the shift, to the end of the torque phase, and thus to 2 at the start of the inertia phase, and to 3 at the end of the inertia phase. Thus, the above-mentioned f · tct = 0 indicates a period from the gearshift command to before the start of the torque phase.

In the next step 19, the shift progress state is detected by the determination of the torque ratio by the processing of FIG. In steps 51 to 53 in FIG. 6, the previous shift progress state is determined from the flag f · tct. As is clear from the above-described processing, if this flag is 0, the time from the gear shift command to the time before the start of the torque phase is reached. That is, 1 indicates that the torque phase has started, 2 indicates that the torque phase has ended and the inertia phase has started, and 3 indicates that the inertia phase has ended and the shift command has been issued. That was before.

If it is determined in step 51 that the torque phase has not been started, it is determined in step 54 whether or not the torque phase has been started based on whether or not the first torque ratio T1 has become equal to or more than the first reference value L1. Check, and when the torque phase is started, in step 55,
The flag f · tct is set to 1 so as to indicate the shift progress state. In determining the first reference value L1, this determination is performed as follows in view of the above object. That is, the first torque ratio T1 becomes 1.0 before the start of the torque phase because the pre-shift output torque estimated value To1 is equal to the output torque detection value To, and therefore, the first torque ratio T1 is calculated from this value. It can be determined that the time has shifted to the start of the torque phase, and the first reference value L1 is determined in consideration of this. Therefore, in actuality, it is, of course, necessary to consider the timing of detection and variations, or to consider the operating oil temperature of the automatic transmission and the type of shift in this determination.

If it is determined in step 52 that the torque phase has been started after the start of the torque phase, the process ends in step 56 depending on whether the first torque ratio T1 has become equal to or greater than the second reference value L2. It is checked whether or not the inertia phase has been started. When the torque phase has been completed and the inertia phase has been started, in step 57, the flag f · tct is set to 2 so as to indicate this shift progress state. Set to. In determining the second reference value L2, this determination is performed as follows in view of the above object. That is, at the end of the torque phase (the start of the inertia phase), the transmission output torque detection value To is theoretically equal to the pre-shift gear ratio x the pre-shift turbine torque Tt1, so that the first torque ratio T1 = the pre-shift gear ratio × T
t1 / To = gear ratio before shifting × Tt1 / gear ratio after shifting × T
t1 = gear ratio before shifting / gear ratio after shifting. Since this value is theoretically the peak value of the first torque ratio T1, the second reference value L2 is determined in consideration of this. .
Therefore, in actuality, it is, of course, necessary to consider the timing of detection and variations, or to consider the operating oil temperature of the automatic transmission and the type of shift in this determination.

If it is determined in step 53 that the inertia phase has started, it is determined in step 58 whether or not the inertia phase has ended based on whether or not the second torque ratio T2 has become less than the third reference value L3. When the check is completed and the inertia phase is completed, a flag f is set at step 59 so as to indicate this shift progress state.
-Set tct to 3. Note that the third reference value L3
Is determined in the light of the above object in the following manner. That is, at the end of the inertia phase, the second torque ratio T2 should be 1.0 since the post-shift output torque estimated value To2 and the transmission output torque detected value To are the same. The third reference value L3 is determined with reference to the above. However, in actuality, in making this decision, the timing of detection and variations are considered,
Alternatively, it is, of course, necessary to consider the operating oil temperature of the automatic transmission and the type of shift.

As a result of the setting of the flag f · tct based on the determination of the torque ratios T1 and T2, the flag f · tct
Is checked, the shift progress state of the automatic transmission can be detected, and this detection result can be used for various controls such as a line pressure control for shifting shock reduction.

By the way, the shift state detecting device of the present embodiment does not need to provide any sensor in relation to the output shaft of the torque converter 2 for which it is difficult to secure the installation space, and can be adopted in any automatic transmission.

Further, the shift progress detecting device of this embodiment is
Basically, the shift progress state is detected based on a change in the torque of the transmission output shaft irrespective of the effective gear ratio of the automatic transmission, so that a torque phase during the shift without a change in the effective gear ratio can also be detected.

In addition, when the shift progress state is detected based on the torque change of the transmission output shaft, the shift progress state is not simply detected based on the torque change rate or the torque change amount. Between the estimated torque value before shifting To1 and the estimated torque value after shifting To2.
Since the shift progress state is determined based on the second torque ratio T1 and the second torque ratio T2, the determination can be performed with high accuracy. Moreover, the estimation of the output shaft torques To1 and To2 before and after the speed change related to the first and second torque ratios T1 and T2 is based on the information related to the input torque of the automatic transmission including the engine speed Ne as described above. Since the shift is continuously performed during the determination that the shift is being performed, the shift progress state can be accurately determined even when the driver operates the accelerator pedal during the shift.

In FIG. 3, in the next step 20, it is determined by the processing of FIG. Step 6 in FIG.
1, the timer Tim for measuring the shift time as described above
Whether or not the shift has been completed is checked based on whether or not er has counted the set time Ts or more indicating the end of the shift. Until the shift is completed, the steps 62 and 63 are skipped to continue the above-described shift progress detection operation. When the shift is completed, the flags f and shift are reset to 0 in the steps 62 and 63, and the next time. Gear stage N in preparation for detection of the shift progress state at the time of shifting
ext · Gp is set to the selected gear stage Cur · Gp. Here, by resetting the flag f-shift to 0 as described above, after the shift is completed, step 13 in FIG. 3 can skip the shift progress state detection processing of steps 14 to 20.

In step 21 of FIG. 3, various normal controls including line pressure control of the automatic transmission 3, engine brake control, lock-up control of the torque converter 2, and the like are executed. Needless to say, the control based on the result of the detection of the shift progress state is also included in the processing in step 21.

FIG. 10 is an operation time chart of the above embodiment. At the instant t ₀ , a shift from the first speed to the second speed is commanded, the transmission output torque To, the first torque ratio T 1, the second torque ratio T 2, during the course of transmission effective gear ratio to follow a change with time as shown in the figure, the torque phase begins at instant t _1, the inertia phase is started the torque phase in the instant t ₂ is terminated and the inertia phase in the instant t ₃ If it is determined that the torque phase has ended, the start of the torque phase is detected when the first torque ratio T1 reaches the first reference value L1, and the end of the torque phase is detected when the first torque ratio T1 reaches the second reference value L2. The start of the inertia phase is detected, and the end of the inertia phase is detected when the second torque ratio T2 decreases to the third reference value L3.

In the above example, the end of the torque phase (start of the inertia phase) is determined by the first torque ratio T1, but this determination is made by determining whether the second torque ratio has reached another reference value. Needless to say, it may be performed depending on the situation.

Further, the turbine torque Tt1, before and after the shift,
To determine Tt2, the characteristic characteristic of the torque converter 2 was used. Torque Tt1, Tt2
May be searched.

Further, the shift progress state is determined by comparing the first torque ratio T1 and the second torque ratio T2 with reference values L1, L2 and L3, respectively. It goes without saying that the time change rates of the ratio T1 and the second torque ratio T2 may be obtained, and the shift progress state may be determined from these.

The transmission output torque detection value To includes the inertia, whereas the calculated torque values Tt1, Tt2, To1, and To2 do not include the inertia. When it is necessary to take into consideration, for example, the output torque To1 before shifting is illustrated as follows:

The torque is calculated by a well-known method such as To1 = gear ratio before shift × transmission efficiency × {Tt1- [gear ratio before shift × (d / dt) No]} (1) Inertia can be considered.

In the above-described example, the shift state is determined by using the torque ratio related to the transmission output torque. However, the present invention is not limited to this. It is needless to say that the same operation and effect can be obtained even if the shift state is determined by using the torque ratio for any part of the torque.

[0063]

As described above, according to the first aspect of the present invention, the shift state detecting device according to the first aspect of the present invention is configured to change the speed of the rotating portion with respect to the detected torque value of the rotating portion which changes in accordance with the shift progress state of the automatic transmission. Since the start and end of the torque phase during gear shifting are determined based on the first torque ratio of the previous estimated torque value, not only the torque converter output shaft but also the torque of any rotating part of the automatic transmission as described above. Since the torque phase can be detected from the torque ratio, there is no need to provide a sensor in connection with the output shaft of the torque converter for which it is difficult to secure a mounting space, and the shift progress detecting device of the first invention can be applied to any automatic transmission. Can also be adopted.

Further, since the shift progress state detecting device of the first aspect of the invention basically detects the shift progress state based on the torque change of the rotating portion regardless of the effective gear ratio of the automatic transmission, the shift progress state detecting apparatus is effective. The torque phase during the shift without the shift can also be detected.

In addition, when the shift progress state is detected based on the torque change of the rotating portion, the shift progress state is not simply detected based on the torque change rate or the torque change amount. Since the shift progress state is determined based on the first torque ratio between the previous torque estimated value and the first torque ratio, the determination can be performed with high accuracy. Moreover,
Since the estimation of the torque of the rotating portion related to the first torque ratio before shifting is performed continuously at least until the start of the torque phase based on information on the input torque of the automatic transmission including the engine speed, the torque Even when the driver operates the accelerator pedal until the start of the phase, the start and end of the torque phase can be accurately determined.

According to a second aspect of the present invention, in obtaining the pre-shift torque estimation value, the inherent characteristics of the torque converter are used from the engine speed, the transmission output speed, and the pre-shift gear ratio. The torque converter output torque is estimated by using
Since the pre-shift torque of the rotating portion is estimated from the pre-shift gear ratio, the device becomes more practical and the estimation can be performed more accurately.

According to a third aspect of the present invention, in determining the torque phase, the start of the torque phase is determined when the first torque ratio becomes a first reference value, and the first torque is determined. Since the end of the torque phase is determined when the ratio becomes the second reference value, the determination can be facilitated.

According to a fourth aspect of the present invention, the post-shift torque of the rotating portion after the shift of the automatic transmission is estimated, and the second torque between the post-shift torque estimated value and the detected torque value is calculated. A similar effect can be achieved by calculating a torque ratio and determining the end of the torque phase from the second torque ratio instead of the first torque ratio when determining the torque phase.

According to a fifth aspect of the present invention, in the same manner as described above, a first torque ratio between a pre-shift torque estimated value for the rotating portion and a detected torque value is calculated, and a post-shift torque is calculated. A second torque ratio between the estimated value and the detected torque value is calculated, and the start and end of the inertia phase are determined from the first and second torque ratios.
Also in such a configuration, the above-mentioned rotating portion is not limited to the torque converter output shaft, but may be any rotating portion of the automatic transmission, and it is necessary to provide a sensor in connection with the torque converter output shaft, which is difficult to secure a mounting space. Instead, the shift progress detecting device can be used in any automatic transmission.

In addition, although the shift progress state is detected based on the torque change of the rotating portion, the shift progress state is not simply detected based on the torque change rate or the torque change amount. Since the shift progress state is determined based on the first and second torque ratios between the estimated torque and the estimated torque, the inertia phase can be determined with high accuracy. Further, the estimation of the torque of the rotating portion related to the first and second torque ratios before and after the shift is continued at least until the start of the torque phase based on information on the input torque of the automatic transmission including the engine speed. Therefore, even when the driver operates the accelerator pedal until the start of the torque phase, the start of the inertia phase,
The end can be accurately determined.

According to a sixth aspect of the present invention, in obtaining the pre-shift torque estimated value, a characteristic characteristic of a torque converter is used from an engine speed, a transmission output speed, and a pre-shift gear ratio. The torque converter output torque is estimated by using
Since the configuration is such that the pre-shift torque of the rotating portion is estimated from the pre-shift gear ratio, the device becomes more practical,
In addition, the estimation can be accurately performed.

Further, in obtaining the above-mentioned post-shift torque estimation, a characteristic characteristic of the torque converter is obtained from the engine speed, the transmission output speed, and the post-shift gear ratio as in a seventh aspect of the present invention. Is used to estimate the torque converter output torque, and from the estimated torque converter output torque value and the post-shift gear ratio, when the post-shift torque of the rotating portion is estimated, the device becomes more practical. In addition, the estimation can be accurately performed.

Further, in the determination of the inertia phase, as in the eighth aspect of the present invention, the first inertia phase is determined by the first inertia phase.
In a case where the start of the inertia phase is determined when the torque ratio reaches the second reference value, and the end of the inertia phase is determined when the second torque ratio reaches the third reference value, the determination is easy. Become.

According to a ninth aspect of the present invention, in the same manner as described above, the second torque ratio between the estimated torque value after the shift for the rotating portion and the detected torque value is calculated in the same manner as described above. Since the start and end of the inertia phase are determined based on the torque ratio, even in such a configuration, the rotating portion is not limited to the torque converter output shaft, and may be any rotating portion of the automatic transmission. There is no need to provide a sensor in connection with the output shaft of the torque converter, which is difficult to secure, and the shift progress detecting device according to the ninth aspect can be used in any automatic transmission.

In addition, although the shift progress state is detected based on the torque change of the rotating portion, the shift progress state is not simply detected based on the torque change rate or the torque change amount. Since the shift progress state is determined based on the second torque ratio between the estimated torque and the estimated torque, the inertia phase can be determined with high accuracy. In addition, the estimation of the torque of the rotating portion related to the second torque ratio after the shift is continuously performed at least until the start of the torque phase based on information relating to the input torque of the automatic transmission including the engine speed. Thus, even when the driver operates the accelerator pedal until the start of the torque phase, the start and end of the inertia phase can be accurately determined.

According to a tenth aspect of the present invention, in calculating the post-shift torque estimation value, the torque converter output is calculated from the engine speed, the transmission output speed, and the post-shift gear ratio using the inherent characteristics of the torque converter. Since the torque is estimated and the post-shift torque of the rotating portion is estimated from the torque converter output torque estimated value and the post-shift gear ratio, the device becomes practical, and the estimation is accurately performed. It can be carried out.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a shift progress state detecting device according to the present invention.

FIG. 2 is a control system diagram of a vehicle power train showing an embodiment of a shift progress state detecting device according to the present invention.

FIG. 3 is a flowchart showing a main routine of a shift progress state determination program executed by a controller in the example.

FIG. 4 is a flowchart showing a subroutine relating to shift determination of the same example.

FIG. 5 is a flowchart showing a subroutine relating to a calculation of a torque ratio in the same example.

FIG. 6 is a flowchart showing a subroutine relating to determination of a shift progress state in the same example.

FIG. 7 is a flowchart of a subroutine relating to a shift end determination of the same example.

8 is an output characteristic diagram of the torque sensor in FIG.

FIG. 9 is a general shift pattern diagram of the automatic transmission.

FIG. 10 is a time chart showing a shift progress state detection operation executed by the device in FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 engine 2 torque converter 3 automatic transmission 4 control valve 5 controller 6 throttle sensor 7 engine rotation sensor 8 transmission output torque sensor 9 transmission output rotation sensor

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification code FI F16H 59:70 F16H 59:70 (56) References JP-A-4-25660 (JP, A) JP-A-4-357363 (JP JP-A-4-191560 (JP, A) JP-A-5-87228 (JP, A) JP-A-5-187538 (JP, A) JP-A-1-193445 (JP, A) 1-182660 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16H 59/00-61/12 F16H 61/16-61/24 F16H 63/40-63/48

Claims (10)

(57) [Claims] An apparatus for detecting a shift progress state of an automatic transmission, comprising: a torque detection means for detecting a torque of a rotating portion where a torque changes according to a shift progress state of the automatic transmission ; Related to the input torque of automatic transmission
Estimate between the torque of the rotating portion before the shift of the automatic transmission on the basis of the information, at least until the start of the torque phase
A pre-shift torque estimating means for continuously performing; a first torque ratio calculating means for calculating a first torque ratio between a pre-shift torque estimated value obtained from both means and a torque detection value; And a torque phase determining means for determining the start and end of the torque phase. 2. The torque converter according to claim 1, wherein the pre-shift torque estimating means estimates a torque converter output torque from the engine speed, the transmission output speed, and the pre-shift gear ratio by using a characteristic characteristic of the torque converter. A shift progress detection device for an automatic transmission, wherein a torque before shift of the rotating portion is estimated from the estimated torque converter output torque and a gear ratio before shift. 3. The torque phase determining means according to claim 1, wherein said torque phase determining means determines the start of a torque phase when said first torque ratio becomes a first reference value.
A shift progress detection device for an automatic transmission, wherein the end of a torque phase is determined when the torque ratio reaches a second reference value. 4. The post-shift torque estimating means for estimating the torque of the rotating portion after a shift of the automatic transmission, and the post-shift torque estimated value obtained from the means and the torque by the torque detecting means. A second torque ratio calculating means for calculating a second torque ratio between the detected values is added, and the torque phase determining means determines the end of the torque phase from the second torque ratio instead of the first torque ratio. A shift progress detecting device for an automatic transmission, comprising: 5. An apparatus for detecting a shift progress state of an automatic transmission, comprising: torque detection means for detecting a torque of a rotating portion in which torque changes according to the shift progress state of the automatic transmission ; Related to the input torque of automatic transmission
Estimate between the torque of the rotating portion before the shift of the automatic transmission on the basis of the information, at least until the start of the torque phase
Pre-shift torque estimating means that continuously performs, first torque ratio calculating means for calculating a first torque ratio between the pre-shift torque estimated value obtained from both means and the torque detection value, and an engine speed. Regarding input torque of automatic transmission
Estimate between the torque of the rotating portion after the shift of the automatic transmission on the basis of the information, at least until the start of the torque phase
A post-shift torque estimating unit that continues to perform; a second torque ratio calculating unit that calculates a second torque ratio between a post-shift torque estimated value obtained from the unit and a torque detection value obtained by the torque detecting unit; A shift progress state detecting device for an automatic transmission, comprising: an inertia phase determining unit configured to determine a start and an end of an inertia phase based on the first and second torque ratios. 6. The pre-shift torque estimating means according to claim 5, wherein the pre-shift torque estimating means estimates a torque converter output torque from the engine speed, the transmission output speed, and the pre-shift gear ratio by using a characteristic characteristic of the torque converter. A shift progress detection device for an automatic transmission, wherein a torque before shift of the rotating portion is estimated from the estimated torque converter output torque and a gear ratio before shift. 7. A torque converter output torque according to claim 5 or 6, wherein the post-shift torque estimating means estimates the torque converter output torque from the engine speed, the transmission output speed, and the post-shift gear ratio by using a characteristic characteristic of the torque converter. A shift progress state detecting device for an automatic transmission, wherein a post-shift torque of the rotating portion is estimated from the torque converter output torque estimated value and the post-shift gear ratio. 8. The method according to claim 5, wherein
The inertia phase determination means determines the start of the inertia phase when the first torque ratio has reached the second reference value, and determines the end of the inertia phase when the second torque ratio has reached the third reference value. A shift progress detecting device for an automatic transmission, wherein 9. An apparatus for detecting a shift progress state of an automatic transmission, comprising: a torque detection means for detecting a torque of a rotating portion whose torque changes according to the shift progress state of the automatic transmission ; Related to the input torque of automatic transmission
Estimate between the torque of the rotating portion after the shift of the automatic transmission on the basis of the information, at least until the start of the torque phase
And the post-shift torque estimating means continues, the post-shift torque estimation value obtained from these means, a second torque ratio calculating means for calculating a second torque ratio between the torque detection value from the second torque ratio A shift progress state detecting device for an automatic transmission, comprising: an inertia phase determining unit that determines a start and an end of an inertia phase. 10. The post-shift torque estimation means according to claim 9, wherein the torque converter output torque is estimated from the engine speed, the transmission output speed, and the post-shift gear ratio using a characteristic characteristic of the torque converter. A shift progress detecting device for an automatic transmission, wherein a post-shift torque of the rotating portion is estimated from the torque converter output torque estimated value and the post-shift gear ratio.