JP2777857B2 - Control device for automatic transmission for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an automatic transmission for a vehicle, and more particularly to a control device for optimally determining a speed ratio during a shift of a shift position of a shift lever.

[0002]

2. Description of the Related Art In general, a control device for an automatic transmission for a vehicle maps a gear shift diagram and stores it in a memory of a microcomputer, and an operation parameter indicating an engine load such as a throttle opening and a driving speed indicating a vehicle speed during running. The gear ratio is determined by searching from the parameters. However, since the gear shift diagram map is created based on a general running state, the speed ratio is frequently switched when traveling on an uphill or downhill road, etc., and does not always provide good shifting characteristics. Was. For this reason, there has recently been proposed a gear shift control which is more suitable for human sensitivity by determining a gear ratio through fuzzy inference.
No. 4 discloses a similar technique.

[0003]

By determining the gear ratio through fuzzy inference as described above, it is possible to realize gear shift control more suitable for human sensitivity. On the other hand, a gear shift diagram map is searched for gear shift control. The technique for determining the ratio also has the advantage of being technically established. Therefore, it is conceivable to control the gear ratio while using both of them. In this case, a special operation state, specifically, a state where it is difficult to determine the gear ratio through fuzzy inference, more specifically, a shift position signal (P, R, N) of the shift lever detected through a shift position switch , D
4,. . ) Is not settled (when it becomes the off position), for example, when the driver touches the shift lever, so-called hand-off position, or when no position signal is input during position switching, or In the case of a failure due to disconnection or the like, there is a problem as to which of the speed ratio obtained by searching the gear shift diagram map and the speed ratio obtained through fuzzy inference. In the prior art in which only the gear shift diagram map is searched to determine the gear ratio, in such a case, a relatively high gear such as a third gear is generally established, and the second gear is selected in consideration of starting, acceleration, and the like. However, when fuzzy inference and publicly known map search are used together, it cannot be considered as equivalent.

In the case where the control is performed by using both the fuzzy inference and the publicly known map search as described above, when returning from the off-position state to the position-determined state, the value obtained by fuzzy inference in a state where the position is not determined is obtained. Determining the gear ratio immediately on the basis of is problematic in terms of reliability. Further, when the fixed position and the off position are frequently repeated, such as in the case of the hand-off position, the speed ratio is frequently switched depending on the determination of the speed ratio, and the continuity of control is lost. The driver may feel uncomfortable.

Accordingly, an object of the present invention is to provide a control apparatus for an automatic transmission for a vehicle which determines a gear ratio by determining a gear ratio using fuzzy inference or the like, and also searches a known gear shift diagram map. When the vehicle is under special driving conditions, such as when the shift position is not fixed, the gear ratio obtained through both methods is optimally selected to ensure control continuity, and no shift-up and shift-down is required. It is therefore an object of the present invention to provide a control device for an automatic transmission for a vehicle, which does not cause the driver to feel uncomfortable due to being repeated.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned object, according to the present invention, there is provided a control system for a vehicle automatic transmission in which a speed ratio can be controlled stepwise or steplessly. Oite the device detects a plurality of operating parameters, detects a first transmission ratio determining means for determining a gear ratio, a value responsive to the vehicle speed and the engine load in accordance with the operating parameters with a predetermined control rule, detected a second gear ratio determining means for determining a gear ratio in accordance with a predetermined characteristic from the value, gear ratio before Symbol second gear ratio determining means for determining a determination whether the gear ratio below a predetermined speed ratio Speed ratio judgment hand
A stage, a detecting means for a shift position signal of the shift lever to detect whether established by the detection means
Detects that the shift position signal has not been established
When the time has been detected, the elapsed time determining means for determining the elapsed time since the detection and the speed ratio determining means determine the second time.
If it is determined that the gear ratio is not below the predetermined gear ratio
It can, varying the output based on the output of the second gear ratio determining means
While determining the speed ratio, the speed ratio determining means
Is determined as the second gear ratio is in a speed ratio less than a predetermined speed ratio
Come to be, out to determine the output of the result, the output gear ratio based on one of the output of the first and second gear ratio determining means according to an output of the elapsed time determining means
Power speed ratio determining means, and the output speed ratio determining means
Shift that drives the transmission mechanism according to the gear ratio determined
And control means, and as it constituted comprising a.

[0007]

When the position signal is not determined, the output is performed based on one of the output results of the first and second gear ratio determining means in accordance with the output of the elapsed time determining means.
Since the gear ratio is determined, it is possible to optimally determine the gear ratio while ensuring continuity of control. Therefore, the upshift and the downshift are not unnecessarily repeated and the driver does not feel uncomfortable.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram generally showing a control device for an automatic transmission for a vehicle according to the present invention. In the drawing, reference numeral 10 indicates an internal combustion engine. The engine output generated by the internal combustion engine 10 is sent to the transmission 14 through the shaft 12 and transmitted to the main shaft 18 via the pump impeller 16a and the turbine runner 16b of the torque converter 16.
Between the main shaft 18 and the counter shaft 20, there is provided a gear mechanism 22 consisting of four forward steps and one reverse step, and a secondary shaft 24 is arranged in parallel with the counter shaft 20. Hydraulic clutches C1 to C4 are arranged at each gear. Incidentally, the one indicated by the symbol CH is a hydraulic clutch for bypassing the one-way clutch 26. Here, the transmission output is the final gear 2
The drive wheel 34 is sent to the differential device 30 through the drive shaft 8 and drives the drive wheel 34 through the drive shaft 32. still,
The hydraulic clutch C4 is used for forward and reverse travels. When the selector 36 is located on the left side in the drawing, the fourth forward speed is established, and when the selector 36 is located on the right side, the reverse gear RVS is established via an idle gear (not shown).

An intake passage (not shown) of the internal combustion engine 10 is provided.
A throttle opening sensor 40 for detecting the opening of the throttle valve (not shown) is provided in the vicinity of a throttle valve (not shown) disposed in the vicinity of the engine, and near a crankshaft or a camshaft (both not shown) of the internal combustion engine 10. A crank angle sensor 41 is provided, and outputs a signal every predetermined crank angle. A shaft 2 is provided near the counter shaft 20 of the transmission 14.
A vehicle speed sensor 42 for detecting a vehicle speed from a rotation speed of 0 is provided. Further, a brake switch 44 for detecting the presence or absence of a brake operation is provided near a brake pedal (not shown), and P and P are provided near a shift lever (not shown) mounted on the floor of the vehicle driver's seat. R, N, D4, D3
A shift position switch 46 for detecting a driver's selection in seven positions 2, 1 is provided, and a switch is provided near an accelerator pedal (not shown) when the driver depresses the accelerator pedal more than a predetermined amount. A kick down switch 48 is provided. Further, the internal combustion engine 1
An intake pressure sensor 49 for detecting an intake pressure as an absolute pressure is provided at an appropriate position of an intake path (not shown) of zero. Outputs of the throttle opening sensor 40 and the like are sent to an ECU (electronic control unit) 50.

The ECU 50 includes a CPU 50a, a ROM 50
b, RAM 50c, input circuit 50d, and output circuit 50e
The sensor (switch) output is input into the microcomputer via an input circuit 50d. As described later, the CPU 50a in the microcomputer controls the R
The gear position (gear position) is determined by searching the gear shift diagram map stored in the OM 50b and through fuzzy inference, and either one is selected. Next, the solenoid valves 54 and 56 of the hydraulic control circuit are energized and de-energized through the output circuit 50e to switch to a shift valve (not shown) so as to achieve the shift speed, and the hydraulic clutch of the corresponding shift speed is released and engaged. The solenoid valve 5
8,60, the lock-up Organization of the torque converter 16
It is for control of the on and off.

Next, the operation of the control device will be described with reference to the flowcharts shown in FIG.

Here, prior to a specific description, the features of the present control device will be schematically described with reference to FIG.
This control device is provided with a well-known gear shift diagram map, which is based on the premise that the gear position (gear position) is determined by searching from the vehicle speed and the throttle opening, and the gear position is also determined through fuzzy inference. That is, when the shift speed based on fuzzy inference is 1st or 2nd speed, the map search value is prioritized, and the shift speed based on fuzzy inference is 3rd.
At the 4th speed, the fuzzy inference value is given priority. When the shift position signal is not established as described later in this configuration, the result of both is optimally selected. The fuzzy inference is performed using parameters such as a vehicle speed, a throttle opening, a running resistance, a vehicle speed at the time of a brake operation, and the like. ), The description is omitted here.

FIG. 2 is a flow chart showing the operation of the control device.
It is a chart and is started every 20 ms. First, in S10, switch outputs of the shift position switch 46 and the like are read, and P, R, N, D
4,. . And the like. Next, proceeding to S12, the A / D conversion value of the analog output of the throttle opening sensor 40 and the like is read, and proceeding to S14 to read the pulse output of the vehicle speed sensor 42 and the like. Is calculated. Next, in S18, a known gear shift diagram map is searched from the vehicle speed and the throttle opening obtained in order to obtain a target shift speed (the shift speed obtained by the map search is set to "S
MAP1 ”). Next, the program proceeds to S20, in which the target shift amount is set to, for example, "2nd shift down" through fuzzy inference.
And the like, and converted into a target shift speed in accordance with the current shift speed and obtained (the shift speed obtained by converting the fuzzy inference value is referred to as “SH”).

Next, the program proceeds to S22, in which the map search gear S
It is determined whether or not MAP1 is the third speed or higher. If the result is negative, the routine proceeds to S24, where the map search gear SMAP1 is determined as the current output gear (referred to as “SMAP”). As a result, as described above, in another routine (not shown), the control value (excitation pattern) is sent to the solenoids 54 and 56 so as to achieve the determined gear position.

On the other hand, at step S22, the map search gear SMAP is set.
When it is determined that 1 is the third speed or higher, the process proceeds to S26,
It is determined whether the shift position signal detected in S10 is established. The shift position switch 46 is P,
R, N, D4, and other fixed contacts provided at positions corresponding to each position, and a terminal attached to the shift lever and moving between the fixed contacts, when the terminal is in contact with the fixed contact, A signal indicating a position corresponding to the contact point is output. Therefore, here, that the shift position signal is "established" means that a signal indicating that any one of the seven positions is selected is output. When it is determined in S26 that the shift position signal has been established, the process proceeds to S28, where timer data 1 is set in the timer T1 and started. Data 1 is assumed to be a time normally required for position switching, for example, 2 seconds.

Next, the routine proceeds to S30, where the flag F. SMAP
It is determined whether or not the bit of S is set to 1. Essentially, the bit of this flag is initially set to 1, and when the bit is set to 1, it means that the shift speed should be determined from the fuzzy inference value. Therefore, S
The determination at 30 is affirmative and the process proceeds to S32, where the bit of this flag is confirmed and reset to 1 and the process proceeds to S34 to determine whether or not the fuzzy inference shift stage SH is higher than the third speed. If the result in S34 is affirmative, the program proceeds to S36, in which the previously output gear position (current actual gear position) SMAP
It is determined whether or not n-1 is equal to or higher than the fuzzy inference shift speed SH. If the result is affirmative, the process proceeds to S38 to determine whether or not the previous output shift speed (current gear speed) SMAPn-1 is equal to the fuzzy inference shift speed SH. Judge. If the result in S38 is affirmative, there is no need to change the gear position, so the process proceeds to S40, and the previous output gear position (current gear position) SMAPn-1 is used as it is as the current output gear position SMAP.

In S38, the current gear SMAPn-1 is set.
When it is determined that the fuzzy inference gear SH is not equal to the fuzzy inference gear, the current gear is higher than the fuzzy inference gear, that is, the current gear is in the 4th gear and the fuzzy inference gear is 3 in the fuzzy inference gear. Therefore, the program proceeds to S42, in which a value obtained by subtracting the first gear from the current gear SMAPn-1 is set as the output gear SMAP. In S36, the current gear SMAP is set.
When it is determined that n-1 is not equal to or higher than the fuzzy inference shift speed, the shift up is performed in reverse. Therefore, the process proceeds to S44, and the value obtained by adding the first speed to the current gear speed is set as the output shift speed.

In S34, the fuzzy inference shift stage SH becomes 3
When it is determined that the speed is not higher than the speed, the fuzzy inference shift speed is the 1st and 2nd speed, so that the process proceeds to S46 and the output shift speed SMAP is set to the 3rd speed. That is, since the fuzzy inference shift speed is the first and second speeds, the output shift speed is determined from the map search value.
In contrast, the fuzzy inference value is set to the third speed because the judgment has been made and the third and fourth speeds are required for a lower gear. As described above, as long as it is determined in S26 that the position signal has been established, every time this program is looped, the process proceeds from S32 while restarting the timer T1 in S28. In, the output gear is determined based on the fuzzy inference result.

If it is determined at S26 that the position signal has not been established in the next and subsequent loops,
Proceeding to 48, it is determined whether the value of the timer T1 has reached zero. The case where the position signal is not established includes a disconnection during position switching, a so-called hand-off position, as described above. And for the first time S26
In when the position signal is determined not to be established as in the case output shift speed is position proceeds to be naturally negative S 30 and subsequent determination of S48 is established is determined.

Subsequently, when the position signal is not established,
If it is determined in S48 that the value of the timer T1 has reached zero, S5
The program proceeds to 0, where timer data 2 is set in the second timer T2 and started. The value of the timer data 2 is set to a value considerably larger than the time required for the position switching, for example, 5 seconds. Next, the routine proceeds to S52, where the flag F. The bit of SMAPS is reset to 0 (meaning that the gear position is determined only by the map search value), and S24
The map search gear SMAP1 is output to the output gear SM
AP. This is continued while the timer T2 is restarted in S52 every time the program is looped, unless it is determined in S26 that the position signal has been established.

Then, when the program is started several times, S
When it is determined at 26 that the position signal has been established (returned), the process proceeds to S30 via S28, where the flag bit is determined to be 0, and the process proceeds to S54 until the value of the timer T2 reaches zero. Proceeding to S24, the output gear is determined from the map search value. Then, in S26, it is determined that the position signal has returned. In S54, it is determined that the value of the timer T2 has reached zero, and the process proceeds to S56, where the map search gear SMAP1 and the fuzzy inference gear SH match. Is determined. Unless it is determined that they match, the routine still proceeds to S24 to determine the output gear from the map search gear, and returns to S32 only after it is determined that the map search gear and the fuzzy inference gear match, and returns to S32. SMAPS bit is set to 1 again and S3
Proceeding to 4 and thereafter, the output gear is determined from the fuzzy inference gear for the third and fourth gears.

The operation of the flow chart of FIG. 2 is summarized as follows. 1. When the shift position signal is established,
For the fourth speed, the output speed is determined from the fuzzy inference speed, and for the first and second speeds, the output speed is determined from the map search speed. 2. When the shift position signal changes from an established state to an unestablished state (off position): a. Until the timer T1 elapses, the output gear stage is determined in the same manner as 1. b. When the timer T1 has elapsed, the output gear is determined only from the map search gear. 3. When the shift position signal returns to the established state again: a. 2-b if it returns before the timer T2 expires
Similarly, the output gear is determined only from the map search gear. b. When returning after the timer T2 elapses, until the map search gear and the fuzzy inference gear match,
The output shift speed is determined only from the map search shift speed, and after a match, the output shift speed is determined from the fuzzy inference shift speed for the third and fourth speeds, similarly to 1. To summarize the above, if the vehicle returns to the position established state before the timer T1 expires even if the vehicle is in the off position, it is a temporary off position. The output gear is determined by the method. However, when the operation returns after the timer T1 has elapsed, it is not always possible to determine that the operation is normal.
The process waits for a sufficient time (timer T2), and after that, returns to the original method only when the fuzzy inference result matches the map search result.

In this embodiment, as described above, when the shift position signal is not established, the conventional control is performed until a predetermined time elapses, thereby ensuring the continuity of the control in preparation for the temporary off-position state and In a more permanent off-position state, for example, when the driver is touching the shift lever and the shift position signal is not intermittently established, until a predetermined time elapses and the return of the shift position signal is definitely confirmed. The shift control is performed only from the map search value, and the control based on the map search value is continued even after a predetermined time elapses until the fuzzy inference value matches the map search value. Continuity of control can be ensured even in the intermittent or permanent off-position state, and Change to unnecessary shift-up and shift down there is no such thing as giving the driver a sense of discomfort is repeated.

Although the case where the shift position signal is not established as a special operation state has been described as an example, the present invention is not limited to this. Here, the special operation state means a case where it is considered that it is inappropriate to determine the shift speed through fuzzy inference as described above. In addition, the extremely low temperature (the viscosity of the ATF is high and the running resistance is low). exactly hard set), the amount of decrease in the vehicle speed during braking operation to schedule as one seldom determined fuzzy inference parameter brake switch has failed, i.e., detects the one of the operating parameters
Various cases can be cited, for example , a case where the detection means is out of order .

Further, although the present invention has been described by taking a stepped transmission as an example, it is needless to say that the present invention is also applicable to a continuously variable transmission, and it is also applicable to traction control and the like.

[0027]

The present invention will be described with reference to an embodiment.
In the section Oite to the control device for the transmission ratio stepwise or steplessly controllable vehicular automatic transmission detects a plurality of operating parameters, in accordance with the operating parameters with a predetermined control rule First gear ratio determining means ( S10 to S18 in FIG. 2) for determining the gear ratio SH , a value corresponding to the vehicle speed and the engine load are detected, and the gear ratio SH is determined from the detected values in accordance with predetermined characteristics. Second speed ratio determining means ( S12, S14, S16, S20 in FIG. 2) ;
Speed ratio SMAP1 previous SL second gear ratio determining means for determining
Be determined but whether a predetermined gear ratio (third speed) following transmission ratio
That the gear ratio determining means and (S22 in FIG. 2), and detecting means for detecting whether the shift position signal of the shift lever is established (S26 in FIG. 2), the <br/> shift position by said detecting means It is detected that no signal has been established
When in, the elapsed time determining means for determining the the elapsed time from being detected (S2 8 in FIG. 2), the gear ratio determining means
If the second speed ratio is not at a speed ratio lower than a predetermined speed ratio,
When it is determined, the output of the second speed ratio determining means is
The output gear ratio is determined based on the
Can and the second gear ratio by the step is determined to be <br/> the gear ratio below a predetermined speed ratio, the first and second gear ratio determining means according to an output of the elapsed time determining means Output gear ratio based on one of the output results
Speed ratio determining means ( S24 to S4 in FIG. 2)
6 ) and the output speed ratio determining means
Transmission mechanism (such as solenoid valve 54)
And shift control means for driving etc.) (ECU 50), since it is configured as Ru with a <br/>, even when in the state, such as position signal is not determined, the first and in accordance with the output of the elapsed time determination means Since the output speed ratio is determined based on one of the output results of the second speed ratio determining means,
The gear ratio can be optimally determined while ensuring the continuity of the control. Therefore, the upshift and the downshift are not unnecessarily repeated and the driver does not feel uncomfortable.

[0028] In the apparatus of claim 2, wherein, in the control device of the gear ratio stepwise or steplessly controllable vehicular automatic transmission, a plurality pieces of operation parameters for detecting a plurality of operating parameters Detecting means (from S10 to S in FIG. 2)
16), first speed ratio determining means (S 18 in FIG. 2) for determining the speed ratio SMAP1 according to the detected operating parameters and a predetermined control rule, and detecting a value corresponding to the vehicle speed and the engine load. , a second gear ratio determining means for determining a gear ratio SH in accordance with a predetermined characteristic from the detected value (S 12, S14, S16, S20 in FIG. 2), before Symbol second gear ratio determining means for determining The gear ratio is the prescribed gear ratio
(3rd speed) Gear ratio determination for determining whether or not gear ratio is below
Means (S22 in FIG. 2), wherein the plurality pieces of operation parameters sensing means either detection means detects whether or not the failure (S26 in FIG. 2), the plurality by said detecting means
When it is detected that any of the number of operating parameter-detecting means is faulty, the elapsed time determining means for sure <br/> constant between time elapsed since it was detected that (S28 in FIG. 2), the Shifting
The second speed ratio is equal to or less than a predetermined speed ratio
When it is determined that the gear ratio is not in the gear ratio, the output gear ratio is determined based on the output of the second gear ratio determining means.
Serial transmission ratio can and the second gear ratio is determined to be in gear ratio below a predetermined speed ratio by determining means, said first and second gear ratio determining means according to an output of the elapsed time determining means Output speed ratio determining means ( from S24 in FIG. 2) for determining the output speed ratio based on one of the output results
S46 ) , and determined by the output speed ratio determining means
The speed change mechanism (the solenoid valve 54)
Bei shift control means and (ECU 50), the driving and the like)
Since it is configured as Ru example, even when in the state, such as sensor failure, among the output results of the first and second gear ratio determining means according to an output of the elapsed time determining means, based on either output Since the gear ratio is determined, the gear ratio can be optimally determined while ensuring continuity of control. Therefore, the upshift and the downshift are not unnecessarily repeated and the driver does not feel uncomfortable.

[0029] In the apparatus of claim 3 wherein, the elapsed time determining means is said detecting means is not established shift position signal of the shift lever, or any of the plurality pieces of operation parameter detecting means Means for determining a first predetermined time T1 after detecting that the vehicle has failed, wherein the output speed ratio determining means comprises: the first speed ratio determining means during the first predetermined time. based on the output result
Output speed ratio is determined based on the above (S28, S48 in FIG. 2).
Owing to this configuration, such as the position signal is not established
When the state is temporary, the gear ratio can be optimally determined while ensuring sufficient control continuity.

[0030] In the apparatus of claim 4 wherein said first after the predetermined time T1 has elapsed, the detection means it is not still established shift position signal of a shift lever, or the plurality pieces of operation parameters When it is detected that any of the detecting means is out of order, the output gear ratio determination is performed.
Constant means based on the output result of the second gear ratio determining means
To determine the output gear ratio (S48, S50, S50 in FIG. 2).
52, S24), even when the state such as the position signal is not established is more permanent,
The gear ratio can be optimally determined while ensuring the continuity of the control more sufficiently.

According to a fifth aspect of the present invention, the elapsed time determination means includes means for determining a second predetermined time T2 after the first predetermined time T1 has elapsed , and the output speed ratio determination. /> means, after said first predetermined time, said detecting means is not still established shift position signal of a shift lever, or the one of the plurality pieces of operation parameter detection means has failed Is detected, the output gear ratio is determined based on the output result of the second gear ratio determining means during the second predetermined time (S50, S50 in FIG. 2).
52, S30, S54), it is possible to determine the gear ratio optimally while further ensuring the continuity of control even when the state such as the position signal is not established is more permanent. it can.

[0032] In the apparatus of claim 6 wherein, said output
The force transmission ratio determining means, when said detecting means does not detect the fact that the shift position signal of the shift lever has not been established, or any of the plurality pieces of operation parameter detection means has failed, the Comparison means for comparing the output results of the first and second gear ratio determination means (FIG.
2 (S36 of FIG. 2) and a selection means (S38 of FIG. 2) for selecting one of the output results of the first and second gear ratio determination means according to the comparison result of the comparison means .
And S46), and is selected by the selection means.
Since it is configured as that determine the output speed ratio based on the-option output result, conditions such as the position signal is not established
When returning to normal operation conditions such as the position signal is established from also can be optimally determined gear ratio while ensuring the continuity of the control. Therefore, the upshift and the downshift are not unnecessarily repeated and the driver does not feel uncomfortable.

[0033] In the apparatus of claim 7 wherein, said detecting means is not established shift position signal of the shift lever, or the one of the plurality pieces of operation parameter detection means has failed and means for determining the predetermined time T2 from the detection, said that the detection means is not established shift position signal of the shift lever, or the one of the plurality pieces of operation parameter detection means has failed After the predetermined time has elapsed since the detection of the speed change is stopped, the comparing means compares the outputs of the first and second speed ratio determining means (S5 in FIG. 2).
4, S56) , so that the gear ratio can be optimized while maintaining control continuity even when returning to a normal operation state such as when a position signal is established from a state where a position signal is not established. Can be determined.

In the apparatus according to claim 8, the output is
The power transmission ratio determining means determines whether the predetermined time T2 has elapsed.
In, out on the basis of the output result of the second gear ratio determining means
Since the power transmission ratio is determined (S54 and S24 in FIG. 2) , continuity of control is ensured even when returning to a normal operation state such as when a position signal is established from a state where a position signal is not established. Thus, the gear ratio can be optimally determined.

In the apparatus according to claim 9, the output is
When the comparison result of the comparison means coincides , the power transmission ratio determination means is configured to output the result based on the output result of the first transmission ratio determination means.
To determine the output gear ratio (S56, S32 to S32 in FIG. 2).
46), the continuity of control is sufficiently ensured even when the vehicle returns to the normal operation state, so that the gear ratio can be optimally determined.

[0036] In the apparatus of claim 10 wherein said
When the comparison result of the comparing means does not match, the output gear ratio determining means determines the output gear ratio based on the output result of the second gear ratio determining means.
Output speed ratio is determined based on the above (S56, S24 in FIG. 2).
With such a configuration, continuity of control is sufficiently ensured even when the vehicle returns to the normal operation state, so that the gear ratio can be optimally determined.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram generally showing a control device for an automatic transmission for a vehicle according to the present invention.

FIG. 2 is a main flow chart showing an operation of an ECU (electronic control unit) in FIG.

FIG. 3 is an explanatory diagram showing features of the control device.

[Explanation of symbols]

 Reference Signs List 10 internal combustion engine 14 transmission 40 throttle opening sensor 41 crank angle sensor 42 vehicle speed sensor 44 brake switch 46 range selector switch 48 kick down switch 49 intake pressure sensor 50 ECU (electronic control unit)

Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16H 61/18 F16H 61/10

Claims (10)

(57) [Claims] 1. A Oite to the control device of the gear ratio stepwise or steplessly controllable vehicular automatic transmission, a. First speed ratio determining means for detecting a plurality of operating parameters and determining a speed ratio in accordance with the operating parameters and a predetermined control rule; b. Second speed ratio determining means for detecting a value corresponding to the vehicle speed and the engine load, and determining a speed ratio from the detected values in accordance with predetermined characteristics ; c . The second gear ratio determining whether the gear ratio determination hand gear ratio determining means determines is in gear ratio below a predetermined speed ratio
Steps; d. Detecting means for detecting whether or not a shift position signal of the shift lever is established; e. When the shift position signal that is not established is detected by said detecting means, and the elapsed time determining means for determining the elapsed time since the detection, f. The second speed ratio is determined by the speed ratio determining means.
When intending to be determined Do the speed ratio follows the gear ratio, the second
The output speed ratio based on the output of the speed ratio determining means of
And the second gear ratio is determined by the gear ratio determination means.
There can and it is determined that the gear ratio below a predetermined speed ratio, the first and second in response to an output of the elapsed time determining means
Of the output results of the speed ratio determining means, out of either
Output gear ratio determination to determine output gear ratio based on force result
Means and g . To the speed ratio determined by the output speed ratio determining means.
Depending on the speed change control means that drive the transmission mechanism, the control system for an automatic transmission for a vehicle, characterized in that it comprises a. 2. A control device for an automatic transmission for a vehicle, wherein a speed ratio can be controlled stepwise or steplessly, comprising: a. A plurality pieces of operation parameter detecting means for detecting a plurality of operating parameters, b. First speed ratio determining means for determining a speed ratio according to the detected operating parameters and a predetermined control rule; c. Second speed ratio determining means for detecting a value corresponding to a vehicle speed and an engine load, and determining a speed ratio according to predetermined characteristics from the detected values ; d . The second gear ratio determining whether the gear ratio determination hand gear ratio determining means determines is in gear ratio below a predetermined speed ratio
Steps, e. It said detection means for detecting whether either has failed multiple number of operating parameter-detecting means, f. And it is detected that one of the plurality pieces of operation parameter detecting means by said detecting means is faulty
Elapse time determining means for determining an elapsed time since the detection , and g. The second speed ratio is determined by the speed ratio determining means.
When intending to be determined Do the speed ratio follows the gear ratio, the second
The output speed ratio based on the output of the speed ratio determining means of
And the second gear ratio is determined by the gear ratio determination means.
There can and it is determined that the gear ratio below a predetermined speed ratio, the first and second in response to an output of the elapsed time determining means
The output of the result, either one group of the gear ratio determining means
Output speed ratio determining means for determining an output speed ratio based on the above, and h . To the speed ratio determined by the output speed ratio determining means.
Depending on the speed change control means that drive the transmission mechanism, the control system for an automatic transmission for a vehicle, characterized in that it comprises a. Wherein the elapsed time determining means detects that the detection means has failed either of the possible shift position signal of the shift lever has not been established, or the plurality pieces of operation parameter detecting means Means for deciding a first predetermined time after the start, wherein the output speed ratio determining means determines an output speed ratio during the first predetermined time based on an output result of the first speed ratio determining means. The control device for an automatic transmission for a vehicle according to claim 1 or 2, wherein: Wherein after said first predetermined time, said detecting means is not still established shift position signal of a shift lever, or the one of the plurality pieces of operation parameter detection means has failed When detecting
4. The control device according to claim 3, wherein the output speed ratio determining means determines an output speed ratio based on an output result of the second speed ratio determining means. 5. The method according to claim 5, wherein the elapsed time determination means is configured to determine the first location.
Means for determining a second predetermined time after a lapse of a fixed time , wherein the output gear ratio determining means is configured such that after the first predetermined time has passed, the detection means still establishes a shift position signal of a shift lever. never, or when detecting that the one of the plurality pieces of operation parameter detection means is out of order, during the second predetermined time, the output based on the output result of the second gear ratio determining means The control device for an automatic transmission for a vehicle according to claim 3, wherein the speed ratio is determined . 6. The output speed ratio determining means comprises: i . Wherein it detecting means is not established shift position signal of the shift lever, or when any of the plurality pieces of operation parameter detecting means does not detect the fact that a failure, the first and second shift Comparing means for comparing the output results of the ratio determining means; and j . Comparison of the output the first and second gear ratio determining means according to the result, and selection means for selecting one provided with a output sintered selected by said selecting means of said comparison means
The control device for an automatic transmission for a vehicle according to any one of claims 1 to 5, wherein the output gear ratio is determined based on the result. 7. The apparatus according to claim 7, wherein the detecting means determines that a shift position signal of a shift lever has not been established, or
And means for determining the predetermined time after detecting that any of the number of operating parameter-detecting means is faulty, the possible detection means is not established shift position signal of the shift lever, or the plurality pieces The comparison means compares the outputs of the first and second gear ratio determination means after a lapse of the predetermined time from detecting that one of the operation parameter detection means has failed. The control device for a vehicle automatic transmission according to claim 6, wherein: Wherein said output gear ratio determining means, according to claim 7, wherein the predetermined time in the course until determines the output gear ratio based on the output result of the second gear ratio determining means A control device for an automatic transmission for a vehicle according to claim 1. 9. The output speed ratio determining means determines an output speed ratio based on an output result of the first speed ratio determining means when the comparison results of the comparing means match. Item 9. A control device for an automatic transmission for a vehicle according to any one of Items 6 to 8. 10. The output gear ratio determining means determines an output gear ratio based on the output result of the second gear ratio determining means when the comparison results of the comparing means do not match. Item 10. The control device for an automatic transmission for a vehicle according to any one of Items 6 to 9.