JP2814754B2 - Transmission control 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 a shift control device for an automatic transmission that performs shift control by electronic control based on a detected driving state and a set shift schedule.

[0002]

2. Description of the Related Art Conventionally, as a shift control device for an automatic transmission, for example, those described in Japanese Patent Application Laid-Open No. Sho 55-109848 and Japanese Patent Publication No. Sho 61-58697 are known.

According to the former conventional source, when the throttle is released in the second speed state, the upshift from the second speed to the third speed is prohibited for a time corresponding to the vehicle speed at that time, and the engine brakes when the power is turned off. There is disclosed a technique for preventing a crank sound generated by the above.

In the latter conventional source, when a throttle opening is less than a predetermined value and a shift speed is two or more, the shift speed is changed by a predetermined time at a time by a time management using a timer. There is disclosed a technique for preventing the engine speed from becoming extremely low and causing an engine braking state to generate a large shift shock.

[0005]

However, in the above-described conventional shift control device for an automatic transmission, although the throttle opening degree condition is included as the upshift prohibition condition, the accelerator change speed is restricted by the upshift prohibition. Since it is not included in the conditions, if the throttle opening degree satisfies the condition of being equal to or less than a predetermined value, upshifting is prohibited regardless of the magnitude of the accelerator change speed. The interval from the shift to the current upshift is longer, and the upshift timing matches the slow accelerator operation.However, during acceleration with a high accelerator change speed, the interval from the previous upshift to the current upshift increases. Prolonged due to shift prohibition, slow upshift despite sudden accelerator operation By the door timing, a large difference in the up-shift of rhythm (interval) will come out for the drivers.

On the other hand, regarding the shift schedule, factors that determine the shift schedule include several items such as optimum power and optimum fuel efficiency. These are correct in each respect but can be inconsistent under certain conditions. For example, in deciding a shift schedule, in an upshift with a low throttle opening, the rhythm of the upshift during acceleration is an important factor. However, the rhythm of the upshift at the time of acceleration is not a decision item of the shift schedule as described above.

[0007] Therefore, when the shift control is performed only in accordance with the shift schedule, at the time of acceleration with a small accelerator change speed, the interval from the previous upshift to the current upshift is short, and the acceleration is quick regardless of the slow accelerator operation. The upshift timing is reached, but during acceleration when the accelerator change speed is high, the interval from the previous upshift to the current upshift is long, and the upshift timing that matches the accelerator quick-depressing operation is set, so that the driver can perform , There is a big difference in the rhythm (interval) of the upshift.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problem, and has a shift control of an automatic transmission that performs a shift control by electronic control based on a detected traveling state and a set shift schedule. It is an object of the present invention to obtain an optimum upshift rhythm for a driver during acceleration at a low throttle opening while obtaining optimum power, optimum fuel efficiency, etc., regardless of differences in accelerator work.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a shift control device for an automatic transmission according to the present invention monitors an accelerator pedal depression speed in a low throttle opening range based on shift control based on a shift schedule. Thus, the upshift is prohibited for a predetermined time only when the accelerator pedal is depressed at a small speed.

That is, as shown in the claim correspondence diagram of FIG. 1, a throttle opening detecting means a for detecting a throttle opening, a vehicle speed detecting means b for detecting a vehicle speed, and an accelerator depression speed detecting for detecting an accelerator depression speed. Means c, a shift schedule setting means d in which a predetermined shift schedule according to the throttle opening and the vehicle speed is set, and a throttle opening determining means e for determining whether the throttle opening is equal to or less than the predetermined opening. The upshift condition is satisfied by comparing the accelerator depression speed determining means f for determining whether the accelerator depression speed is equal to or lower than a predetermined speed, and the throttle opening detection value and the vehicle speed detection value with the set shift schedule. Upshift determination means g for determining whether or not to perform the operation, and when the throttle opening is equal to or less than a predetermined opening, the accelerator depression speed At a predetermined speed or less, when satisfying the upshift condition, characterized in that it includes an up shift inhibiting section h for inhibiting only upshift predetermined time.

[0011]

When the vehicle is accelerated by a gentle accelerator operation at a low throttle opening, the throttle opening determining means e determines whether or not the throttle opening from the throttle opening detecting means a is equal to or less than a predetermined opening. In the speed determining means f, it is determined whether or not the accelerator stepping speed from the accelerator stepping speed detecting means c is equal to or lower than a predetermined speed, and in the upshift determining means g, the throttle opening detected value from the throttle opening detecting means a and By comparing the vehicle speed detection value from the vehicle speed detection means b with the shift schedule set in the shift schedule setting means d, it is determined whether or not the upshift condition is satisfied. Is less than the specified opening, the accelerator pedal depressing speed is When satisfying the condition for a predetermined time only the upshift is prohibited.

[0012]

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

The configuration will be described.

FIG. 2 is an overall system diagram showing an automatic transmission to which the shift control device according to the embodiment of the present invention is applied.

As shown in FIG. 2, the automatic transmission according to the embodiment has a torque converter 2 as a main transmission connected to an engine 1, and a planetary gear 3 as an auxiliary transmission. A transmission clutch / brake 4 as a transmission element is mounted together with the planetary gear 3.
A control valve 5 is provided as hydraulic control means for engaging or releasing the brakes 4 according to each shift position, and pressurized hydraulic oil is supplied to the control valve 5 from an oil pump 6. Control valve 5
, Line pressure solenoid 7, lock-up solenoid 8, shift solenoid A
9, a shift solenoid B10 and a timing control solenoid 11 are additionally provided.

The solenoids 7, 8, 9, 1
0 and 11 respectively have a clutch hydraulic activation signal,
A control unit 12 (mainly a microcomputer) for outputting a lock-up operation signal, a shift command, a shift command, and a hydraulic timing signal is connected. The control unit 12 includes, as means for obtaining input information,
Oil temperature sensor 13, throttle sensor 14 (corresponding to throttle opening detecting means), engine rotation sensor 15, vehicle speed sensor 16 (corresponding to vehicle speed detecting means), inhibitor switch 17, AT mode switch 18, ASCD switch 1
9 is connected. The control unit 12 is also connected to a power pattern indicator 20 that lights up and displays in the vehicle compartment when a power pattern is set as a shift schedule.

The throttle sensor 14 is connected to the engine 1
A potentiometer type sensor attached to the throttle chamber unit outputs a signal corresponding to the throttle opening TVO.

The vehicle speed sensor 16 is a pulse pickup type sensor mounted at the position of the transmission output shaft.
Outputs a signal corresponding to P.

A shift schedule SS as shown in FIG. 4 is stored and set in the shift schedule storage section of the control unit 12 (corresponding to a shift schedule setting means).

The shift unit A9 and the shift solenoid B10 from the control unit 12 can obtain the first to fourth gear positions by ON / OFF shift commands shown in FIG.

The operation will be described.

FIG. 3 is a flowchart showing the flow of the shift control operation performed by the periodic interruption, and each step will be described below.

In step 50, the throttle opening TVO and the vehicle speed VSP are read.

In step 51, the shift schedule SS
Is read.

In step 52, the current throttle opening
Accelerator depression speed ΔTVO is calculated from the absolute value of the difference between TVO and the previous throttle opening TVOM (corresponding to accelerator depression speed detection means).

In step 53, it is determined whether or not the throttle opening TVO is equal to or smaller than a set throttle opening TVOL (corresponding to throttle opening determining means).

In step 54, the accelerator depression speed ΔTV
It is determined whether O is equal to or less than the set accelerator depression speed ΔTVOL (corresponding to accelerator depression speed determination means).

If NO is determined in at least one of steps 53 and 54, the process proceeds to step 55, where the upshift prohibition timer value is set to 0 (zero).

In step 56, the throttle opening TVO and the vehicle speed VSP are compared with the shift schedule SS.

In step 57, it is determined whether or not the running state based on the throttle opening TVO and the vehicle speed VSP including the upshift and the downshift satisfies the shift condition.

In step 58, it is determined whether the shift is an upshift (corresponding to an upshift determining means).

Then, in the case of an upshift,
Proceeding to step 59, the upshift prohibition timer value is 0
It is determined whether or not the timer value is (zero). If the timer value is not 0, the process proceeds to step 60, where 1 is subtracted from the timer value at that time (corresponding to an upshift prohibiting means).

If it is determined in step 57 that the running state does not satisfy the shift condition, the process proceeds to step 61, where it is determined whether the upshift inhibition timer value is 0 (zero). Proceeding to step 60, 1 is subtracted from the timer value at that time.

If it is determined in step 58 that a downshift has occurred, or if the upshift prohibition timer value is
If determined to be (zero), the routine proceeds to step 62, where a shift command is output.

In step 63, the timer value is set to a timer initial value for determining an upshift prohibition time.

Accordingly, during acceleration by gentle accelerator operation at a low throttle opening, it is determined in step 53 that the throttle opening TVO from the throttle sensor 14 is equal to or smaller than the set throttle opening TVOL, and step 54 is performed.
In step 57, it is determined that the accelerator depression speed ΔTVO is equal to or less than the set accelerator depression speed ΔTVOL, and in steps 57 and 58, the throttle opening TVO and the vehicle speed VSP are determined.
It is determined whether the upshift condition is satisfied by comparing the shift schedule SS with the shift schedule SS. If all of these conditions are satisfied, the timer initial value set in step 63 is reset in step 60 for each control cycle. The value is decremented by one, and upshifting is inhibited for a predetermined time until the upshift inhibition timer value is determined to be 0 (zero) in step 59.

For this reason, when the throttle opening is equal to or less than a predetermined value and the accelerator change speed is small, the interval from the previous upshift to the current upshift becomes longer due to the prohibition of the upshift, which matches the slow accelerator operation. It is upshift timing. On the other hand, when the throttle opening is equal to or less than the predetermined value and the accelerator change speed is high, the upshift prohibition timer value is set to 0 in step 55.
By setting to (zero), even if it is determined in step 58 that an upshift has been performed, the process immediately proceeds from step 59 to step 62, and an upshift shift command is output. Therefore, the upshift is performed in accordance with the shift schedule SS, and the interval from the previous upshift to the current upshift is an early upshift timing that matches the rapid accelerator operation.

As described above, in the embodiment, the automatic transmission that performs the shift control by electronic control based on the detected throttle opening TVO and the detected vehicle speed VSP and the set shift schedule SS is described. Since the shift control device is based on the shift control based on the shift schedule SS and monitors the accelerator depression speed ΔTVO in the low throttle opening range, the upshift is prohibited for a predetermined time only at a small accelerator depression speed. Optimal upshift rhythm (interval) for the driver when accelerating with a low throttle opening, regardless of differences in accelerator work, while obtaining optimal power and optimal fuel efficiency based on shift control based on shift schedule SS Can be obtained.

Although the embodiment has been described with reference to the drawings, the specific configuration is not limited to the embodiment, and any changes or additions without departing from the gist of the present invention are included in the present invention. It is.

For example, in the embodiment, an example in which the upshift prohibition time is given as a fixed time by a timer value has been described. However, for example, the upshift prohibition time is set to a variable time according to the accelerator pedal depression speed, the type of upshift, and the like. May be given by

[0041]

As described above, according to the present invention, there is provided a shift control device for an automatic transmission which performs shift control by electronic control based on a detected traveling state and a set shift schedule. Based on the shift control based on the shift schedule, while monitoring the accelerator pedal speed in the low throttle opening range, the upshift is prohibited for a predetermined time only when the accelerator pedal is at a low accelerator pedal speed. At the same time, when accelerating at a low throttle opening, the effect of obtaining an optimal upshift rhythm for the driver can be obtained regardless of the difference in accelerator work.

[Brief description of the drawings]

FIG. 1 is a claim correspondence diagram showing a shift control device for an automatic transmission according to an embodiment.

FIG. 2 is an overall system diagram of an automatic transmission to which the shift control device of the embodiment is applied.

FIG. 3 is a flowchart illustrating a flow of a shift control operation performed by a control unit of the embodiment device.

FIG. 4 is a diagram illustrating an example of a shift schedule stored and set in a control unit of the embodiment device.

FIG. 5 is an ON / OFF shift command characteristic diagram output from a control unit to a shift solenoid A and a shift solenoid B in order to obtain first to fourth gear positions in the embodiment device.

[Explanation of symbols]

 a throttle opening detecting means b vehicle speed detecting means c accelerator stepping speed detecting means d shift schedule setting means e throttle opening determining means f accelerator pedaling speed determining means g upshift determining means h upshift inhibiting means

Continuation of front page (56) References JP-A-58-81256 (JP, A) JP-A-1-176842 (JP, A) JP-A-61-103043 (JP, A) JP-A-61-282655 (JP) JP-A-55-109848 (JP, A) JP-A-62-37557 (JP, A) JP-A-62-46056 (JP, A) JP-B-61-58697 (JP, B2) (58) Field surveyed (Int.Cl. ⁶ , DB name) F16H 59/00-61/12 F16H 61/16-61/24 F16H 63/40-63/48

Claims (1)

(57) [Claims] 1. A throttle opening detecting means for detecting a throttle opening, a vehicle speed detecting means for detecting a vehicle speed, an accelerator depressing speed detecting means for detecting an accelerator depressing speed, and a predetermined value corresponding to the throttle opening and the vehicle speed. Shift schedule setting means in which a shift schedule is set, throttle opening determining means for determining whether the throttle opening is equal to or less than a predetermined opening, and accelerator for determining whether the accelerator depression speed is equal to or less than a predetermined speed Step-up speed determining means, upshift determining means for determining whether or not an upshift condition is satisfied by comparing a throttle opening detection value and a vehicle speed detection value with a set shift schedule; When the accelerator pedal depressing speed is below the specified speed and the upshift condition is satisfied, at the specified time A shift control device for an automatic transmission, comprising: an upshift prohibiting unit that prohibits an upshift only during the shift.