JPS61218436A - Speed change control unit for automatic speed changer gear - Google Patents

Abstract

PURPOSE:To prevent a rapid change in the driving force of wheels due to leaping speed change and the generation of slippage by prohibiting said leaping speed change of an automatic speed change gear while steering condition which is detected by a steering condition detecting sensor is at above a certain value. CONSTITUTION:When driving a car, a suitable gear position is operated by a controller 15 based on the output signals of an inhibitor switch 19 for detecting the selection range of an automatic speed change gear 10, a throttle opening sensor 16, and a car speed sensor 17, to control 1-2, 2-3, and 3-4 gear shift solenoids 12 to 14 in accordance with the results of the operation. Also, steering angle theta detected by a steering angle sensor 18 is read, and checked whether it is above a defined value thetas or not. This defined value thetas is determined to be a steering angle corresponding to the upper limit value of a turning radius of a change in posture of a car caused by slippage due to change in driving force accompanying leaping speed change. When theta>=thetas, prohibition of leaping speed change is commanded, to shift the automatic speed change gear 10 by means of an interval speed change control.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for properly controlling the speed change of an automatic transmission while a vehicle equipped with an automatic transmission is turning.

(Prior Art) Automatic transmissions generally use a signal corresponding to the vehicle speed and a signal corresponding to the engine load (throttle opening, etc.), as shown in, for example, Japanese Patent Laid-Open No. 59-271159. Generally, a gear position is calculated based on a predetermined speed change pattern, and the gear position is automatically shifted to a predetermined gear position by energizing a shift solenoid corresponding to the gear position.

(Problems to be Solved by the Invention) However, such conventional automatic transmissions perform normal gear changes under any turning conditions while the vehicle is turning, resulting in the following problems.

In other words, even when the vehicle is turning, if conditions such as a sudden change in throttle opening (engine load) or a large change in one vehicle speed are met, the automatic transmission will skip one gear and shift over (from scratch to two). 8→L shifting, 2→Scratch shifting, etc.). This skipping gear changes the driving force greatly and suddenly,
If such a sudden change occurs during a turn, especially on a low-friction road 15 such as a snowy road or an unpaved road, an unexpected change in the posture of the vehicle may occur due to slipping.

(Means for Solving Problem 1) In view of the above-mentioned problems, the present invention provides an automatic transmission 1 as shown in FIG.
A steering state detection 1 sensor 2 detects the steering state of the vehicle, and an automatic transmission 1 detects the steering state of the vehicle while the steering state is equal to or higher than a predetermined value in response to a signal from the sensor. means 8 for prohibiting the jump shifting.

(Operation) In this structure, while the vehicle is turning when the steering state of the vehicle detected by the sensor 2 is equal to or higher than a predetermined value, the means 8 detects a jump shift of the automatic shift @1. Accordingly, by means of jump speed change of automatic offshore converter during turning (Embodiment) Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 shows an embodiment of the speed change control device of the present invention.

In the schematic diagram, 10 is an electronically controlled automatic transmission, 11 is a valve body for controlling the speed change, 12 to 14 are shift solenoids, respectively, 12 is a 1--2 shifton lens;
8 is a 2-8 shift solenoid, and 1Φ is an 8-4 shift solenoid. In addition, the automatic gear shift 2" iso lO is set to IH by switching the -2 shift solenoid 12 ON and 1 OFF.
2-speed shift is performed, and the 1st gear is shifted by the combination shown in the following table of 2-8
This is to select/select from speed to fourth speed, but the description of the reverse gear is omitted because it is not related to the present invention.

The shift lenses 12 to 14 are individually controlled ON and OFF by the controller 15 to perform normal speed change control and speed change control aimed at by the present invention. Therefore, the controller 15 receives a signal from the throttle opening sensor 16 that detects the throttle opening TH representing the engine load, a signal from the vehicle speed sensor 17 that detects the vehicle speed, and a signal that detects the steering state. For example, Japanese Patent Laid-Open No. 59-68621 discloses a sensor for detecting the steering angle θ of a vehicle.
The grooved steering angle sensor IB as shown in the publication
and the selection range of the automatic transmission, i.e. parking (P
) range, reverse (R) range, neutral (N) range, forward automatic shift (D) range, forward 2nd speed fixed (II) range or forward 1st continuous fixed CI) range.
A signal from the Vita switch 19 and a signal B from the brake switch 20 that detects that the brakes of the vehicle are activated are input. The controller 15 turns on the shift solenoids 12 to 1Φ based on the calculation results of these human factors.
OFF control.

Therefore, the controller 15 is assumed to be a microcomputer, for example, and executes the control program shown in FIG. This program is started at regular intervals after the engine is started, and first, in step 21, it is determined whether the jump shift prohibition flag CHGFLG is 1 or not, that is, whether the jump shift of the automatic transmission is prohibited. Check to see if there is one. This CHGFLG is set to 1 when intermittent shifting is prohibited by the determination described later, and is reset to O when intermittent shifting is canceled and permitted.

When the jump shift is permitted with 0HGFLG←1, the automatic transmission 10 is controlled to shift normally by selecting step 22. In this shift control, a suitable gear position is calculated or looked up in a table O based on the selected range determined from the signal @L, throttle opening TH and vehicle speed, and the shift solenoids 12 to 12 are set to this suitable gear position. 141 ON,
Switch OFF.

At this time, if the current gear position matches the preferred gear position, ON and OFF of shift solenoids 12 to 1.41 will not be changed, and if they do not match, shift solenoid +51゛2
-14 ON and OFF are changed, and of course, if this discrepancy is due to skipping one gear, it will be a jump shift.

By the way, when it is determined in step 21 that 0HGFLG-1, that is, jump shifting is prohibited, the automatic transmission IO is shifted by interval change control by selecting the □ gear in step 28. For this shift control, a suitable gear position is determined in the same manner as described above, and the shift solenoids 12 to 141 are
If the current gear position and the preferred gear position, which can be determined from the combination of ON and OFF, are the same or adjacent to each other and do not match, normal gear change control is performed, but if the mismatch occurs by skipping one gear, the current Turn on shift gear maids 12 to 14 to bring the gear position one step closer to the preferred gear position.
OFF, first shift to the corresponding gear position, maintain this gear 1 position for a predetermined time, then shift solenoid 1.
Shifting to a suitable gear position is performed by switching QNI OFF from 2 to 14.

From step 22 or 28 i! II Step 2Φ
After reading the steering angle θ, proceed to step "25".
Then, it is checked whether this steering angle θ is greater than or equal to a predetermined value 08. Note that the predetermined value θ8 is a steering angle corresponding to the upper limit of the turning radius at which the vehicle slips and changes its attitude due to a change in driving force accompanying a jump shift. If θ≧08,
In other words, in the first turning condition where the vehicle slips if the jump gear shift is performed, in step 26, θ≧
The timer TM, which measures the duration of the skip shift prohibition after θ8 becomes θ<θ8, is cleared, and in the next step 27, the above-mentioned flag 0H is set to command jump shift tJ+hi.
Set GFLC'' to l.

If it is determined in step 25 that θ<θ6, that is, in a turning condition where the vehicle does not slip even with jump shifting, 0HGFLG is determined in step 28.
It is determined whether or not 1, that is, whether or not one consecutive shift transmission is currently prohibited, and if it is not prohibited, the control is immediately terminated to continue the state in which the transmission transmission is permitted.

0HGFLG after execution of step 27 or in step 2B
If it is determined that = 1, it is determined whether the vehicle is traveling on a winding road or not based on the determinations in steps 29 to 82 IX as follows. In step 29, it is determined whether the throttle opening degree TH is greater than or equal to a predetermined value TH, and in step 80, the vehicle mV
It is determined whether or not is less than a predetermined value 8, and in step 81 it is determined whether the timer TM is greater than or equal to a predetermined value Tu.
1■>■6 and TM (TM), it is assumed that the vehicle is traveling on a winding road, and in step 82, it is determined whether the vehicle will not slip even if the gear is shifted by jumping. When θ≧θ6, jump gear shift is performed.

In a place where the vehicle slips, the timer TM is incremented (stepped forward) in step 88, and then the control is terminated.
Keep G = 1 and continue to prohibit jump shifting.

In step 29, it is determined that TH≧TH, and in step 8
0, it is determined that V≦■8, or TM is determined in step 81.
≧TM, when traveling on a non-turning road, or step 82
When it is determined that θ<θ6, there is no need to prohibit jump shifting, step 8Il! The steering state detection sensor may detect the steering frequency and prohibit the jump shift when the frequency is equal to or higher than a predetermined value.

FIG. 4 shows another example in which step 86' is added to the control program of FIG. 8, and in this example, in step 851, it is determined from the signal B (see FIG. 2) whether or not the brake is being operated. . If the brake is activated, the control proceeds to step 27, and if the brake is not activated, the control proceeds to step 28.

By adding brake operation to the jump shift prohibition conditions, the jump shift is prevented from being prohibited in vain.

(Effects of the Invention) Thus, as described above, the speed change control device of the present invention is designed to automatically perform a jump shift where M < m while the steering condition is above a predetermined value. It is possible to avoid a sudden change in the driving force of the wheels due to gear shifting, and a change in attitude of the vehicle due to slipping.

1. Brief description of the drawings FIG. 1 is a conceptual diagram of the speed change control device of the present invention, FIG. 2 is a system diagram showing an embodiment of the device VT of the present invention, and FIG. 3 is a controller of the rotating device 6. FIG. 4 is a flowchart showing an example of the control program.

1... Automatic transmission 2... Steering state detection sensor 8... Jump shift prohibition means 10... Electronic control automatic transmission IJ... Valve bodies 12 to 14... Shift solenoid 15. ...Controller 1B...Throttle opening sensor J7...Vehicle speed sensor 18...Operation fil'P
Angle sensor 19... Inhibitor switch 20... Pregi switch Fig. 1

Claims (1)

[Claims] 1. In a vehicle that includes an automatic transmission as a part of the power drain, a steering state detection sensor that detects the steering state of the vehicle; and a signal from the sensor that indicates that the steering state is equal to or higher than a predetermined value. 1. A shift control device for an automatic transmission, comprising: jump shift prohibition means for prohibiting jump shift of the automatic transmission during a period of time.