JPH0660684B2 - Shift control device for automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention has a plurality of shift patterns, and shifts the plurality of shift patterns based on a predetermined reference value of an engine load or a change rate of the engine load. The present invention relates to a shift control device for an automatic transmission that operates.

[Prior Art and its Problems] Conventionally, in an automatic transmission of a vehicle such as an automobile, a gear type transmission is combined in a rear stage of a torque converter, and a control device automatically shifts the gear type transmission according to a traveling state. Is configured.

The vehicle speed and the throttle opening or the throttle depression speed (corresponding to the engine load and the change rate of the engine load, respectively) are input to the control device, and the control device determines a predetermined control pattern (based on the input information). Control table)
The shift control is performed according to the following.

In the shift control based on such one control table,
When the vehicle speed and the engine load or the rate of change of the engine load have a constant relationship, the shift operation (shift up or shift down) is naturally performed. However, the actual driving conditions vary depending on the road conditions, and the driving patterns differ depending on the individual driver.Therefore, it is not always possible to change gears according to the driving conditions, or it is not possible for the driver to change gears. There was a problem that was done.

Therefore, recently, as disclosed in Japanese Patent Publication No. 51-22698 or Japanese Patent Publication No. 57-8983, a plurality of control tables are provided, and the plurality of control tables are provided to determine the engine load or the rate of change of the engine load. Switching is performed on the basis of a reference value, and shift control is performed in accordance with an actual traveling state. The one disclosed in Japanese Patent Publication No. 51-22698 switches the control table according to the throttle depression speed (that is, the rate of change of engine load), and the one disclosed in Japanese Patent Publication No. 57-8983 discloses throttle opening. The control table is switched based on (that is, engine load).

In this case, the control table is set to two modes, an economy mode in which the gear is relatively quickly changed to a high-speed gear to improve fuel efficiency, and a power mode in which the running performance is emphasized in which the fuel consumption is changed at a higher rotation speed. Is common.

However, in the above conventional configuration, since the control table is switched based on the engine load or the rate of change of the engine load, the relationship between the preset vehicle speed and the engine load or the rate of change of the engine load is constant. Then, the switching is performed.

Here, in normal driving, it is desirable to drive in economy mode as much as possible from the economical aspect, and in climbing and the like, it is desirable to drive in power mode in order to improve traveling performance. It was not possible to deal with different running conditions. That is, in the conventional configuration, the running state and the running pattern by the driver are estimated from the engine load or the rate of change of the engine load, and it corresponds to the actual running state such as the uphill road and the winding road and the running pattern by the driver. There was something I couldn't control.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a shift control device for an automatic transmission, which is capable of performing shift control in accordance with a more actual traveling state or a traveling pattern by a driver. .

[Configuration of Invention] Therefore, the shift control device for an automatic transmission according to the present invention is
Load frequency detecting means for detecting an occurrence frequency of the state quantity of the engine load, and reference value changing for changing a reference value for switching the shift pattern based on the occurrence frequency of the state quantity of the engine load detected by the load frequency detecting means. And means.

Then, the load frequency detection means aggregates the engine load state quantities for each unit time for a predetermined time for each unit engine load state quantity to obtain the respective occurrence frequencies, and the value of the unit engine load state quantity with the highest occurrence frequency. Is compared with a predetermined reference value, and the reference changing means changes the reference value for switching the shift pattern based on the comparison result.

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

FIG. 1 shows an automatic transmission AT to which a shift control device for an automatic transmission according to the present invention is applied.

The illustrated automatic transmission AT has four solenoids SL1, which are operated and controlled by the control device 10.
A hydraulic valve (not shown) of the hydraulic control circuit CK is driven by SL2, SL3 and SL4, and a combination of shift gears is changed by the operation of the hydraulic valve to shift gears, that is, gear change.

The control device 10 includes a detection signal from a throttle opening sensor TS provided in the engine EN and an output rotation sensor RS provided on the output shaft of the automatic transmission AT (the output rotation speed is obtained here). , Which is synonymous with the vehicle speed) is input, and the control device 10 controls the operation of the sonoids SL1, SL2, SL3, SL4 based on these input signals to perform a gear change. .

The control device 10 includes a control unit 20 including a CPU and the like.
And a storage device 30, and the control unit 20 includes a load frequency detecting unit 21 as a load frequency detecting unit, a table switching control unit 22 as a reference value changing unit, and a shift control unit 23. .

The storage device 30 stores two shift control tables as shown in the shift diagram in FIG. 2, and a shift table switching control table (shown in FIG. 3) for controlling switching between the two shift control tables. Is remembered. Here, FIG. 2 (A) shows a shift control pattern (economy mode) that emphasizes economy (fuel consumption) to shift to a high speed gear relatively early.
And (B) is a shift control pattern (power mode) that emphasizes traveling performance and shifts at a higher rotation speed.

The load frequency detection unit 21 collects throttle opening data (angle) input from the throttle opening sensor TS for each predetermined unit time, and changes the throttle opening change amount for each unit time within a predetermined time. At this time, a total is calculated for each predetermined unit throttle opening change amount. In other words, in this embodiment, the "state quantity of engine load" for detecting the occurrence frequency is taken as the throttle opening change amount, and the unit throttle opening amount of the throttle opening change amount per unit time is The frequency of occurrence for each change amount is totaled within a predetermined time.

The table switching control unit 22 compares the value of the unit throttle opening change amount having the highest occurrence frequency (that is, the largest total amount) with the predetermined reference value based on the total result of the load frequency detection unit 21. By this comparison, the reference value for switching between the economy mode and the power mode is set to "E" in which the economy mode region is large or the power mode region is large (in the power mode in the shift table switching control table shown in FIG. 3). This is for deciding which of "P" is to be applied.

The shift control unit 23 receives the input signals from the throttle opening sensor TS and the output rotation sensor RS based on the shift table switching control table (“E” or “P”) determined by the table switching control unit 22. The economy mode shown in FIG. 2 (A) or the power mode shown in FIG. 2 (B) is read, and the shift control table is switched to the corresponding shift control table. The shift control is performed based on the.

Next, the shift table switching control table selection control by the control unit 20 will be described in detail with reference to the control flowchart shown in FIG.

First, the timer t ₀ is set to a predetermined measurement time: t, and the throttle opening frequency table: N (x) is cleared,
The throttle opening: Tα is read as T _n-1 (step S1), and the table switching control unit 22 is set to be controlled by the shift table switching control table "E". (Step S2) The throttle opening per unit time is reduced by subtracting the throttle opening: T _n-1 which is a unit time (for example, 50 ms) before from the throttle opening: T _n detected by the throttle opening sensor TS. Amount of change in degree: ΔT is obtained. (Step S
3, S4) Amount of change in throttle opening obtained in step S4: ΔT
Is a predetermined unit throttle opening: ΔT ₀ (for example, 5 °)
Then, the change amount of the throttle opening: ΔT is converted into an integer value for each unit throttle opening (ΔT / ΔT ₀ = T _s ). (Step S5) Then, the amount of change in the throttle opening that has been converted into an integer value:
N (Ts) is counted for each unit throttle opening in the throttle opening frequency table: N (x) shown in FIG. 4, and this is repeated for each unit time for a predetermined time (measurement time t).
(Step S6) When the measurement time t ends, the timer: t ₀ is reset (step S7), and at the same time, the frequency of the throttle opening change amount tabulated in the throttle opening frequency table N (x) is the highest. Of the unit throttle opening change amount (total number): T _SA is selected.
(Step S8) As above, the steps up to step S8 become the load frequency detecting unit 21.

Next, in the table switching control unit 22, the total throttle opening obtained by multiplying the maximum frequency T _SA by the unit throttle opening: ΔT ₀ (that is, the throttle opening in the unit slot opening change amount with the highest occurrence frequency). (Total value of) is compared with a predetermined throttle opening reference value T ₀ (step S9),
If it is larger than the reference value, the shift table switching control table is switched to "P" (step S10), and the step S
Based on the shift table switching control table determined in 10, the power mode and the economy mode are switched in accordance with the relationship between the throttle opening: ΔT and the vehicle speed. (Steps S11, S12, S13) Then, the shift control unit 23 performs shift control based on the shift table (power mode or economy mode).

Hereinafter, the above cycle is repeated.

According to the above configuration, by collecting the occurrence frequency of the throttle opening change amount for each unit time for each unit slot opening change amount within a predetermined time, the occurrence frequency of the throttle opening change amount for each unit time is determined. It is possible to grasp the driving condition. That is, for example, when the amount of change in the throttle opening is high even when driving on a general road, it is expected that the road is a winding road or sports driving. When the frequency of the throttle opening change amount is low, it is possible to improve the fuel efficiency by widening the control range in the economy mode assuming that the running performance is not particularly expected. Therefore, it is possible to deal with the difference in the driving pattern depending on the driver, such as the driving characteristic or the fuel efficiency.

In the above embodiment, the shift mode is switched based on the predetermined reference value of the throttle opening, but it can also be applied to the switching based on the predetermined reference value of the change rate of the throttle opening. It is a thing.

Further, in the above embodiment, the throttle opening change amount is detected as the occurrence frequency, but the occurrence frequency with respect to the magnitude of the throttle opening itself may be detected.

[Advantages of the Invention] As described above, according to the shift control device for an automatic transmission of the present invention, the frequency of occurrence of the state quantity of the engine load for switching the shift pattern is detected, and the shift is performed based on the frequency of occurrence. By changing the reference value for switching the pattern, it is possible to switch to a shift pattern that matches the running pattern, and more natural shift control is possible.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a shift control device for an automatic transmission according to the present invention, FIG. 2 is a shift control table, (A) is an economy mode, (B) is an economy mode, and FIG. 3 is a shift table. A switching control table, FIG. 4 is a throttle opening frequency table, and FIG. 5 is a flowchart showing control. 10 ...... Control device 20 ...... Control unit 21 ...... Load frequency detection unit (load frequency detection) 22 ...... Table switching control unit (reference value changing means) 23 ...... Shift control unit AT ...... Automatic transmission (automatic transmission ).

Claims (1)

[Claims] 1. An automatic transmission having a plurality of shift patterns, wherein the shift patterns are switched based on a predetermined reference value of an engine load or a change rate of the engine load to perform a shift operation. Load frequency detecting means for detecting the occurrence frequency of the state quantity of the engine load for switching, and a reference value for changing the shift pattern based on the occurrence frequency of the state quantity of the engine load detected by the load frequency detecting means. A shift control device for an automatic transmission, comprising: a reference value changing means for changing the.