JPS62278344A - Shift control device for automatic transmission for vehicle - Google Patents

Abstract

PURPOSE:To shorten the control time by providing a means correcting the learning value by the preset resolution based on the difference when comparing the learning value with the current value of a shift position in a device setting the shift target value based on the learning value of the shift position. CONSTITUTION:During the travel of a vehicle, in an electronic control unit 15, first if a shift command is issued, a point S-alpha on this side of a shift target value by alpha is made a target value, when a shift fork shaft passes the target value s-alpha, solenoid valves 2, 3 for shifting are immediately made off, and a shift actuator 1 is made free. Next, when the learning timing is attained, the current value S corresponding to the shift stroke is read out from a stroke sensor 14. If it is within the normal stroke range and the preceding shift action is learnt, the current value S is compared in size with the learning value. The learning value is corrected in response to the deviation, and the shift target value is set based on the learning value after correction.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a shift control installation for an automatic transmission for a vehicle that ensures shift operation during gear changes.

(Prior Art) In an automatic transmission for a vehicle, since the gear shift operation of the transmission is not performed manually, the completion of the gear shift cannot be detected by a tactile response or the like. Therefore, a position sensor such as a switch detects the completion of a gear shift, and based on this, measures are taken to prevent gear shift abnormalities such as a gear shift failure or an excessive gear shift. For this reason, variations in gear shift positions and the like between automatic transmissions installed in each vehicle require troublesome adjustment, and the variations cannot be easily accommodated.

As a countermeasure for the above-mentioned variations, a shift control device for an automatic transmission for a vehicle (patent application 1986-1982) is proposed in which the shift actuator is equipped with a detent mechanism and the shift target value is learned.
No. 0094) has been proposed.

(Problem to be solved by the invention) In the above proposal, in order to suppress variations in shift positions, learning of the position is repeated and a weighted average of the learned values is calculated. This method requires calculation software for multiplication and division on the program, and has the disadvantage of requiring control time and a large amount of program memory.

In addition, since the shift point of a transmission does not normally fluctuate like the learning point of a clutch mechanism when the clutch is in a partially engaged state, the above method would rather sensitively pick up the fluttering of the gears while driving, resulting in unstable learning. A problem arises.

The present invention has been made in view of the above-mentioned problems, and its purpose is to minimize unnecessary fluctuations in the shift target value of the shift actuator and to smooth the shift operation of an automatic transmission for a vehicle. Provides control equipment.

(Means for solving the problem) The present invention provides a shift control device for a vehicle automatic transmission that sets a shift target value based on a learned value of a shift position of a shift actuator detected by a shift sensor. A shift control device for an automatic transmission for a vehicle is provided, comprising means for correcting a learned value by a predetermined resolution based on a difference compared with a current value of the shift position.

(Function) Since the learning value is updated using addition and subtraction calculations, the calculation software is simplified, control time is shortened, and unnecessary fluctuations in the shift target value can be minimized. be.

(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 related to a shift control device for a vehicle transmission according to the present invention, and FIG. 2 is a process flow diagram showing an example of the shift control process.

In FIG. 1, 1 indicates a shift actuator, and 3
It is configured so that it can be stopped at any position. This consists of a stepped cylinder 1a, a first piston 1b, and a cylindrical second piston IC that fits into the first piston 1b.
A shift lever 1e of the transmission is attached to the end of the piston rod 1d of the first piston 1b. The piston rod 1d becomes neutral when hydraulic pressure is applied to both oil chambers 1f and Ig of the stepped cylinder 1a, and when oil pressure acts only on the oil chamber 1g, the first piston 1b moves downward together with the second piston IC. (A) Gear stage R shown in the figure.
It will be shifted to 2nd and 4th gear.

Moreover, when oil pressure acts only on the oil chamber 1f, only the first piston lb moves upward, and the gear stage shown in FIG.
It will be shifted to 3rd and 5th speeds. Reference numeral 2.3 is a solenoid valve, which is a magnetic valve that communicates the oil chambers 1g and IF with the hydraulic power source 4 and the tank 5.

6 is a shift fork shaft having a shift block 7 that engages with the end of the shift lever 1e, and a shift fork 8 is attached thereto. 9 is a sleeve that engages with the end of the shift fork 8; 10 is an insert; 11 is a synchronizer block ring that is moved by the insert 10;
2 is a gear.

13 is a detent mechanism, which has a spring 13a and a steel pole 13b. The shift fork shaft 6 is provided with three positioning grooves 13c corresponding to, for example, neutral and H shift positions, and one of these grooves 13c is held by a spring 13a. The steel pole 13b is pressed against the steel pole 13b to maintain the shift stroke position of the shift fork shaft 6.

14 is a stroke sensor that detects the stroke position of the piston rod ld, and 15 is an electronic control unit, which has a computer configuration equipped with a central processing unit, an input/output device, various memories, etc., and the output of the stroke sensor 14, not shown. Based on various signals such as engine rotational speed, vehicle speed, select lever, etc., the shift solenoid valves 2 and 3 are selectively activated to move the piston rod 1d to one of the three positions using hydraulic pressure. It moves and shifts.

Next, the operation on the wood flow side will be explained according to the processing flow diagram of FIG.

When a shift command is issued, first check the learned value of the shift stage (O if not learned) to determine whether or not it is an initial shift, and if not learned, move to the initial shift (step a). ). In the initial shift, S is considered to be the deepest shift position (position up to the stomper) in terms of design and manufacturing that can be considered for that gear. Shift toward the position (step b) - After the shift command, the current value of the stroke sensor 14 is always read, and the S
It is determined whether or not the o position has been reached, and even if a predetermined period of time has elapsed, the S
. If the position is not reached, stop the shifting operation once and try shifting again (steps c-f). However, the purpose of repeating the shifting is to remove a jam in the middle of the gear, for example, n S even if it is repeated twice. If the position is not reached, it is determined that the maximum shift stroke of the mechanism is a short stroke, and if it is determined that it is a short stroke, for example, the maximum and minimum values on the drawing dimensions It is determined whether the value is between the values (SL-SL-1), and when it is confirmed that the value is between these values, the initial shift is considered to be completed (steps d and e).
) * Then, in step C, the shift is S. When the position is reached or found to be between the maximum and minimum values in step e, the initial shift is considered complete and the valve free flow proceeds to step h.

If it is determined in step a that the shift is not an initial shift, the shift solenoid valve is turned off at a point S-α before the shift target value S α (estimated amount of overshoot). This takes into account the overshoot m of the 7-cut unit 1 after the solenoid valve is turned off, and prevents damage to the gear due to overstroke (step g
), when the shift fork shaft passes the target value S-α, the solenoid valve is immediately turned off to free the actuator l (step h). In this way,
The shift fork shaft allows the detent mechanism to move freely under the vibrations of the gears.

After that, when it comes time to learn (step i
), the current value S' corresponding to the shift stroke is read from the stroke sensor 14 (step j), and compared with a predetermined range to see if it is within the normal stroke range (step k). If an abnormal correction is detected, it is assumed to be a reading error and no learning operation is performed.

Furthermore, if the previous shift operation is an initial shift (step statement), there is no learning value for the shift, so the current value S' for that shift stroke is substituted for the target value S (step m
).

Incidentally, if it is determined that the stroke sensor value S' has been learned in the past in step n, the process proceeds to step n, where a check is performed to see whether the stroke sensor value S' and the learning value are large or small. Here, if the value of S' is smaller than the learning value, the calculation of learning value = learning value - 1 is performed in step O, and if the value of S' is larger, the process proceeds to step P and learning value = learning value + 1. The following calculations are performed, each learned value is modified to the minimum, and the process proceeds to the next flow.

In step q, it is checked whether the shift position based on the above learned value is maintained, and if it is maintained, the flow of steps i-q is repeated, and if not, the shift is removed in step r. It will be done.

Although the present invention has been described with reference to one embodiment, it is within the scope of the gist of Kisuke.

These are not excluded from the scope of the present invention.

(Effects of the Invention) As explained in detail above, in the present invention, the shift target value during the shift operation of the shift actuator of the transmission is
Since the learning value is updated using the addition/subtraction method, the program memory for calculation is simplified and control time is shortened, and unnecessary fluctuations in the shift target value can be minimized to ensure smooth operation. This has the effect of enabling shift operations.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a shift mechanism related to a shift control device for a vehicle transmission according to the present invention, and FIG. 2 is a flowchart showing an example of shift control processing. DESCRIPTION OF SYMBOLS 1... Shift actuator, 1a... Stepped cylinder, ld... Piston rod, 6... Shift fork shaft, 12... Gear, 13... Detent mechanism, 14... Stroke sensor, 15...Electronic control device. Figure 2

Claims (1)

[Claims] In a shift control device for a vehicle automatic transmission that sets a shift target value based on a learned value of a shift position of a shift actuator detected by a shift sensor, a predetermined resolution is determined based on the difference between the learned value and the current value of the shift position. 1. A shift control device for an automatic transmission for a vehicle, comprising means for correcting a learned value.