JPH0514818B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a shift control device for an automatic transmission that sets a neutral position and a gear position of an automatic transmission mounted on a vehicle using learned values.

(Prior Art) In recent years, automatic transmissions for vehicles have been developed, in which an actuator operated by hydraulic pressure, for example, is operated by commands from an electronic control device mounted on the vehicle, without manual gear shifting operations. , the gear change operation of the transmission is being performed.

Completion of a shift operation in this type of automatic transmission for vehicles is determined by reading a detection signal from a position switch, for example, but in order to accommodate variations in the shift positions of individual vehicles, it is necessary to Since the switch must be adjusted, these adjustments are time-consuming.

For this purpose, a stroke sensor is provided to detect the shift position of the shift actuator of the transmission, and the operating position of the shift actuator at the shift position is learned from the detection value of the stroke sensor to set the shift target value. A proposal for a shift control device for a transmission is shown in Japanese Patent Application No. 190094/1983.

(Problems to be Solved by the Invention) In the above proposal, a learned value based on a detected value of a stroke sensor is used as a shift target value of a shift actuator, and a shift operation to a gear is performed. Therefore, there is no need to adjust the shift position, but it is necessary to adjust the neutral position of the stroke sensor, which serves as a reference, and there is a problem in that this adjustment requires time and effort.

The present invention has been made in view of the above-mentioned problems, and its purpose is to update the detected value of the stroke sensor when operating the shift actuator in the neutral stage as a learning value, thereby improving the neutral shift actuator. An object of the present invention is to provide a shift control device for an automatic transmission that attempts to correctly set the position and shift position of each gear stage.

(Means for Solving the Problems) According to the present invention, an automatic transmission for a vehicle includes a shift actuator that operates a transmission to a neutral gear position and a gear position based on a gear change command from an electronic control device. In the machine, a stroke sensor detects a shift position of a shift actuator, a learning means for learning a detected value from the stroke sensor corresponding to a shift position after a shift operation to a neutral gear for a predetermined period of time, and learning from the learning means. A shift control device for an automatic transmission is provided, which has a setting means for setting a shift target value of a neutral gear during gear shifting based on a value.

(Function) In the present invention, the shift amount when the shift actuator is operated to the neutral gear is detected by a stroke sensor, and the detected shift value is updated as a learning value as a shift target value, and the shift target value for the neutral gear is updated. It has the effect of setting. Furthermore, when setting the shift target value for each gear, an offset amount is added and set based on the shift target value for the neutral gear.

Note that there is also an effect in which the shift operation is deemed to be completed when a predetermined time set at the time of the shift operation has elapsed.

(Example) Next, an example of the present invention will be described in detail using the drawings.

FIG. 1 is an explanatory diagram of a shift mechanism showing an embodiment of a shift control device for an automatic transmission according to the present invention.

In the figure, reference numeral 1 denotes a shift actuator, which stops at position 3 to shift the transmission, and includes a stepped cylinder 1a, a first piston 1b, a second piston 1c, and the like. A shift lever of a transmission (not shown) is attached to a piston rod 1d provided on the first piston 1b, and in response to a shift operation of the piston rod 1d, the gears 1, 3, and 5 shown in FIG. The transmission is configured to shift to three positions: speed side, neutral speed, and R, 2nd, and 4th speed sides. In addition,
This shift operation becomes a neutral state when oil pressure is applied to the oil chambers 1e and 1f provided at both ends of the stepped cylinder 1a, and when oil pressure is applied to the upper oil chamber 1e, the first piston 1b shifts to the second piston 1c. At the same time, it moves downward and is shifted to the R, 2nd, and 4th gears via the piston rod 1d. Further, when oil pressure is applied to the oil chamber 1f, the first piston 1b moves upward, and the transmission is shifted to the 1st, 3rd, and 5th gears via the piston rod 1d.

V7 and V8 are solenoid valves, and when power is supplied, the oil passages of the solenoid valves V7 and V8 are controlled to open and close, and the hydraulic oil from the hydraulic source 2 is transferred to the oil chambers 1e and 1f.
The tank 3 is configured to supply hydraulic oil from the oil chambers 1e and 1f to the tank 3.

A stroke sensor 4 detects the shift position of the piston rod 1d, and is configured, for example, in the form of a potentiometer, and detects the sliding position of a contact 4a that slides in response to the movement of the piston rod 1d as a voltage value. The information is then transmitted to an electronic control device, which will be described later. Reference numeral 5 designates a select actuator, which stops at position 3 and performs a select operation of the transmission, and includes a stepped cylinder 5a, a first piston 5b, a second piston 5b, and a stepped cylinder 5a similar to the shift actuator 1 described above. It is equipped with a piston 5c, etc. A piston rod 5d is provided on the first piston 5b, and the gear stage shown in FIG. 1A is selected by a select operation of a select lever (not shown). V5 and V6 are solenoid valves, and by controlling the power supplied to the solenoid valves V5 and V6, the hydraulic pressure of the hydraulic oil supplied to the oil chambers 5e and 5f is controlled, and the operation of the select actuator 5 is controlled. is configured to do so.

N ₁ , N ₂ , and N ₃ are select switches, each of which detects the select position of the select actuator 5 and sends a detection signal to the electronic control unit 6. Further, Nt is a neutral switch attached to a transmission (not shown), which is turned on in a roughly neutral range and sends this detection signal to the electronic control unit 6.

The electronic control unit 6 is composed of a microcomputer, and includes a central processing unit that performs calculations and timer counts in response to input signals,
It is equipped with a memory device that stores various control programs, input/output devices, etc. Then, the solenoid valve V
5, V6, V7, V8, etc., the select actuator 5 and shift actuator 1 are actuated by hydraulic pressure, and the transmission is shifted to a predetermined gear position.

The operation of this embodiment configured in this way will be explained in the second to second sections.
This will be explained according to the processing flow diagram shown in FIG.

FIG. 2 is a process flow diagram for setting the position of the neutral gear. First, when a shift command to neutral is issued from the electronic control unit 6, step 1
At , a check is made to see if neutral learning has already been performed, and if it has not been learned, the program counter is cleared to 0.
Both electromagnetic valves V7 and V8 are opened to operate the piston rod 1d with hydraulic pressure applied to the oil chambers 1e and 1f to the neutral position (steps 2 and 3).

In step 4, the elapsed time after the above operation is checked on a counter to determine whether or not a predetermined set time has elapsed, and if it has not elapsed, the process is repeated until it has elapsed and the process proceeds to the next flow. .

Step 5 is the transmission neutral switch.
It is checked whether Nt is on or not, and then in step 6 it is checked whether the detected value from the stroke sensor 4 is within a predetermined set value range. This is to remove abnormal detected values. In these steps, if the neutral switch Nt is on and the detected value from the stroke sensor 4 is within the range of the set value, this detected value is stored in the memory of the electronic control unit 6 as a learning value ( Step 7). If the neutral switch Nt is off in steps 5 and 6 and the value is not within the range of the set value, it is determined to be an abnormal value and is not used as a learning value, but is regarded as neutral in step 5'.

In step 1, if neutral learning has already been performed, proceed to step 8, clear the counter and set it to 0, open both solenoid valves V7 and V8, operate the shift actuator 1, and move the piston rod 1d. Operate neutrally (step 9). Then, in step 10, it is determined whether or not it is within the neutral control range. If it is not within the neutral control range, in the next step 11, the elapsed time of the neutral operation is checked by the value of the counter, and it is determined whether the elapsed time of the neutral operation has exceeded the predetermined set time. If not, return to step 10 and repeat; if the set time has been exceeded, proceed to step 12 to retry and return the operation to the original shift direction. Then, return to steps 8 to 10 and repeat the above operations.

If the shift position is in the neutral control range in step 10, the counter built in the electronic control unit 6 is cleared in step 13, and then the process proceeds to step 14. If the purpose of the shift operation is to shift to neutral gear, , and if the elapsed time according to the counter exceeds the predetermined set time,
The detected value from the stroke sensor 4 is updated as a learned value for the new neutral gear shift position (steps 15 and 16). In addition, in step 15,
If the elapsed time is less than the predetermined set time, the process returns to step 14 to determine the final target gear and is checked again.

Next, FIG. 3 is a processing flow diagram regarding a shift instruction of the shift actuator. When a shift instruction is issued by the electronic control device 6, the step
17, it is determined whether the shift to neutral has already been learned. If it has not yet been learned, the counter is cleared to 0 (step 18), the solenoid valve V7 or V8 is opened and hydraulic pressure is applied to the oil chamber 1e or 1f to shift to the target gear, and the counter is set to 0 for the predetermined set time. It is checked whether or not the period has elapsed (steps 19 and 20). If the set time has not yet elapsed, the process is repeated until the set time has elapsed, and when the set time has elapsed, it is regarded as a shift and this flow ends (step 21).

If the shift to neutral has been learned in step 17, the offset amount for shifting to the gear position is added to the already learned learning value to set the neutral learning value + shift offset amount (step 22). Next, the counter is cleared in step 23, and a shift operation is performed by the shift amount set in step 22 (step 24). Then, in step 25, it is determined whether the shift point of the gear position has been exceeded based on the detected value from the stroke sensor 4, and if the shift point has not been exceeded, it is checked in step 26 whether or not a predetermined set time has elapsed. If the shift point is not exceeded and the set time has elapsed, it is assumed that the shift operation is locked and the process returns to step 22 for a retry to repeat the operation.

Incidentally, in step 25, if the detected value from the stroke sensor 4 exceeds the shift point of the gear stage, this flow is ended.

FIG. 4 is a processing flow diagram regarding the select instruction. First, in step 28, the counter is cleared and set to 0, and in step 29, the solenoid valves V5 and V6 are selectively controlled to open and close, and the select actuator 5 is activated. The gear is activated and a selection operation to a predetermined gear is performed. In step 30, it is checked by select switches _N1 to _N3 whether a predetermined gear has been selected, and if it has not been selected, the step
At step 31, a counter checks whether a predetermined set time has elapsed. If the selection has not been made even after the set time has elapsed, the operation is performed in the original selection direction at step 32 for a retry, and the process returns to step 28, where the selection operation is repeated.

When a predetermined gear position is selected in step 30, the detected value of the stroke sensor is read in step 33, and the learned value for neutral is updated based on this detected value (step 34).

FIG. 5 is a processing flow diagram regarding updating of the learned value. First, in step 35, it is determined whether the detected value from the stroke sensor 4 corresponding to the shift operation of the shift actuator is within a predetermined setting range. If the value is outside the set range, it is considered an abnormal value and removed from the deletion flow. If it is within the set range, it is checked in step 36 whether or not it is initial learning depending on whether there is already a learned value, and if it is not an already learned value, it is initial learning, so in step 37 this detected value is Set as the learning value.

If learning has already been done in step 36, proceed to step 38, compare the current learned value with the previous learned value, and if it is smaller, use the value obtained by subtracting 1 of the minimum decomposition ability from the previous learned value. Set as the updated learning value, and if the current learning value is large, set the value obtained by adding 1 to the previous learning value as the updated learning value. prevent.

Next, FIG. 6 is a processing flow diagram related to counter increment. After the counter is cleared, an interrupt is generated, for example, every X msec, and the value of the counter is +
FIG. 3 is a flowchart showing a process of adding data one by one.

Further, FIG. 7 is a processing flow diagram related to gear stroke reading, and when reading the detected value of the stroke sensor, the detected value of the stroke sensor is read, calculated, and updated every X msec, for example.

Although the present invention has been described with reference to the above embodiments, various modifications can be made within the scope of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) According to the present invention, when setting the shift position of the shift actuator to neutral, the detected value from the stroke sensor is updated as a learning value and the shift position is set, so that the shift position to the gear position is set. This has the effect that the reference neutral position can be set correctly without requiring a troublesome adjustment process.

Further, by adding an offset amount to the set shift position to neutral, it is possible to easily set the shift position of each gear stage.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a shift mechanism showing one embodiment of the shift control device for an automatic transmission according to the present invention, and FIG.
The figure is a process flow diagram for setting the position of the neutral stage, Figure 3 is a process flow diagram for shift actuator shift instructions, Figure 4 is a process flow diagram for select instructions, and Figure 5 is a process flow diagram for updating learning values. FIG. 6 is a process flow diagram related to counter increase, and FIG. 7 is a process flow diagram related to gear stroke reading. 1...Shift actuator, 1d...Piston rod, 4...Stroke sensor, 5...Select actuator, 5d...Piston rod,
6...Electronic control device, _N1 , _N2 , _N3 ...Select switch.

Claims (1)

[Scope of Claims] 1. In a vehicle automatic transmission equipped with a shift actuator that operates the transmission to a neutral gear position and a gear position based on a gear change command from an electronic control device, the shift actuator shift position a stroke sensor for detecting a shift position, a learning means for learning a detected value from the stroke sensor corresponding to a shift position after a shift operation to a neutral gear for a predetermined period of time, and a learning means for learning a detected value from the stroke sensor corresponding to a shift position after a shift operation to a neutral gear for a predetermined time; 1. A shift control device for an automatic transmission, comprising: setting means for setting a shift target value. 2. A shift target value for each gear during gear shifting is set based on a shift target value for the neutral gear set by the setting means and in accordance with a predetermined offset amount. Shift control device for an automatic transmission according to item 1. 3. The shift control device for an automatic transmission according to claim 1, wherein when there is no learned value by the learning means, the shift is deemed to be completed after the predetermined time has elapsed.