JPH01116361A - Control device for automatic transmission - Google Patents

Abstract

PURPOSE:To prevent the occurrence of speed change hunting by performing the speed change control of an automatic transmission based on only a vehicle speed without relying on a detected signal corresponding to an engine load variation accompanying a constant speed traveling control during the constant speed traveling control. CONSTITUTION:A constant speed traveling control means C drives a throttle valve A through an output control means B in accordance with the deviation between a target vehicle speed by a setting means F and an actual vehicle speed detected by a detecting means D to control the output of an engine E, to obtain the target vehicle speed. A speed change control means H for carrying out the speed change control of an automatic transmission G sets a speed change pattern corresponding to an engine load (throttle opening) and a vehicle speed according to a first speed-change stage setting means J as a speed change pattern at the time of not carrying out constant speed traveling control, while setting a speed change pattern corresponding to only the vehicle speed according to a second speed-change stage setting means K it the time of carrying out the constant speed traveling control. Thereby, speed change control can be properly performed without being accompanied by speed change hunting.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a control device for an automatic transmission that is equipped with a constant speed running control means for maintaining the actual vehicle speed at a target vehicle speed, and that performs speed change control based on a speed change pattern. It is related to.

(Prior Art) Conventionally, in order to control the traveling speed of a vehicle, constant speed driving control means that controls engine output to maintain the actual vehicle speed at a target vehicle speed, and an automatic transmission that performs speed change control according to a predetermined speed change pattern. (For example, Japanese Patent Laid-Open No. 57
-Refer to Publication No. 198317).

In the above engine, during constant speed driving control, the engine output is feedback-controlled in response to the deviation between the set target vehicle speed and the actual vehicle speed to maintain the target vehicle speed without operating the accelerator pedal. It is. Further, shift control for switching gears of an automatic transmission is generally performed based on a shift pattern that is set in accordance with engine load such as accelerator opening and vehicle speed.

(Problems to be Solved by the Invention) However, in an automatic transmission for an engine equipped with a constant speed running control means as described above, the speed change control is performed depending on the engine load such as the accelerator opening and the vehicle speed. During constant speed driving control, engine load control is performed by the constant speed driving control means, and the engine load detection value used in the speed change control is hunting, where the control amount repeatedly fluctuates in a short period of time as a result of the constant speed driving control. phenomenon may occur.

If the shift control of an automatic transmission is performed based on the control variable that causes the hunting phenomenon as described above, the hunting phenomenon may also occur in the shift control of the automatic transmission, causing the gear position to change for a short period of time. There is a risk that the control will lack a sense of stability, with repeated downshifts and upshifts.

In particular, it is preferable for automatic transmissions to be controlled based on a shift pattern that is set according to the accelerator opening and vehicle speed in terms of control responsiveness. In the case where the accelerator operation is electrically controlled separately from the accelerator operation, the accelerator operation is released and the opening degree is 0 during constant speed driving control, and it is not possible to perform gear change control based on the accelerator opening degree. It is something that will disappear.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to provide a control device for an automatic transmission that prevents shift hunting from occurring in shift control when constant speed driving control is being executed. It is.

(Means for Solving the Problems) In order to achieve the above object, the automatic transmission control device of the present invention adjusts engine load such as accelerator opening and vehicle speed when constant speed driving control is not being executed. a first gear position setting means for setting a gear position in the speed change control means based on a speed change pattern in which a gear position is set correspondingly; The second gear setting means is configured to set the gear in the shift control means based on the gear shift pattern in which the gears are set.

FIG. 1 is an overall configuration diagram for clearly showing the configuration of the present invention.

For a vehicle engine E, for example, its throttle valve A
An output control means B is provided to control the engine output by adjusting the opening of the engine E, and controls the vehicle speed by setting the engine E to a predetermined output state.

Further, a signal from a constant speed running control means C that maintains the running speed of the vehicle at a predetermined speed is outputted to the output control means B, and a vehicle speed detecting means that detects the actual vehicle speed is output to the constant speed running control means C. A signal from the vehicle speed setting means F for setting the vehicle speed and the target vehicle speed is input, and a control signal corresponding to the deviation between the actual vehicle speed and the target vehicle speed is output, and constant speed driving control is performed so that the actual vehicle speed becomes the target vehicle speed. conduct.

Furthermore, a shift control means H for changing the gear of the automatic transmission G is provided, and the shift control means H controls the shift set by the first gear setting means J or the second gear setting means K depending on the operating state. The gears are controlled in stages. m above
l The gear setting means J sets the gear based on a gear shift pattern in which the gear is set corresponding to the engine load such as the detected accelerator opening value and the vehicle speed when constant speed driving control is not executed. On the other hand, when constant speed driving control is being executed, the second gear setting means determines the gear based on a gear shifting pattern in which the gear is set corresponding only to the vehicle speed. be.

(Function) In the automatic transmission control device as described above, if constant speed driving control is not being performed and engine output control is being performed based on the driver's operation, engine control such as accelerator opening etc. Automatic transmission control is performed by setting gears based on a shift pattern that corresponds to the load and vehicle speed, improving the responsiveness of shift control such as kickdown, and responding more responsively to driver operations. On the other hand, if constant speed driving control is being executed and engine load control is being performed by the constant speed driving control means, only the vehicle speed is controlled without using the speed changing parameters associated with engine load fluctuations such as throttle opening. Shift control is performed by determining the gear position based on a shift pattern in which the gear position is set corresponding to the speed change, and the gear change control during constant speed driving control is performed by preventing gear hunting caused by control characteristics in constant speed driving control. We make sure that things can be done properly.

(Example) The present invention will be described in detail below with reference to the drawings.

FIG. 2 is an overall configuration diagram of a specific example. This embodiment shows an example in which the engine output is controlled by throttle control that electrically controls the throttle valve of the engine according to the accelerator opening degree, and constant speed driving control is performed.

A throttle valve 3 for adjusting the amount of intake air is interposed in an intake passage 2 of the engine 1, and the throttle valve 3 is driven to open and close by a throttle actuator 4 such as a DC motor. The automatic transmission 5 also includes a plurality of shift solenoids 6a.
~ 6 and a lock-up solenoid 7, and the hydraulic circuit is switched by the combination of turning on and off the transmission solenoids 68 to 6c, and a plurality of hydraulic engagement elements are selectively engaged, whereby the transmission mechanism is activated. Switching is performed to multiple gears. Further, a lock-up clutch (not shown) in the torque converter is engaged or released by turning on or off the lock-up solenoid 7.

A throttle control controller 8A is provided that outputs a throttle control signal a to the throttle actuator 4, and also outputs a shift control signal and a lock-up control signal C to each solenoid 6a to 6C97 of the automatic transmission 5. A speed change control controller 8B is provided. The throttle control controller 8A receives a vehicle speed signal Vn from a vehicle speed sensor 9 that detects the vehicle speed, an accelerator opening signal α from an accelerator sensor 11 that detects the amount of depression of the accelerator pedal 10 (accelerator opening), and a brake operation signal. Brake switch 12 that detects
, a throttle opening signal TH from the throttle sensor 13 that detects the opening of the throttle valve 3, a gear position signal GP from the gear position sensor 14 that detects the shift position of the transmission 5, and a mode. The speed change mode signal M from the switch 15 is inputted, and the main switch 16, set switch 17, and resume switch 18 are used as constant speed driving operation switches.
, operation signal from coast switch 19 (ON, 0FF
) are input respectively.

On the other hand, the speed change control controller 8B receives the vehicle speed signal Vn from the vehicle speed sensor 9, the accelerator opening signal α from the accelerator sensor 11, the throttle opening signal TH from the throttle sensor 13, and the mode switch 15. A speed change mode signal M is respectively input.

Next, the processing of the controllers 8A and 8B will be explained according to a flowchart.

FIG. 3 shows the main routine of the throttle controller 8A. At the start of operation, the controller 8A performs a predetermined system initialization (step Sl), reads the detection signals from the various sensors, and uses these signals for M@. input various information (S2).

Step S3 is automatic speed control (AS) including constant speed driving control.
It is determined whether the conditions for starting C) are satisfied.The starting conditions for this automatic speed control are that the main switch 16 is on, the shift position is in the D range, and the vehicle speed is at a set value (e.g. 40/h) or more. Further, the conditions for canceling the automatic speed control are when the above-mentioned start condition is not satisfied or when the brake is activated.

When this automatic speed control condition is satisfied, the automatic speed control is started and the set switch 17 and the resume switch 1 are activated.
8. In response to the operation of the coast switch 19 and the accelerator and brake operations, mode setting control such as vehicle speed feedback control mode, acceleration mode, etc. is performed (S4), and setting control of the target throttle opening degree To corresponding to each mode is performed (S4).
S5).

Furthermore, if the automatic speed control conditions are not satisfied, the routine shifts to normal throttle control, and the throttle opening degree To is set and controlled based on the accelerator operation amount (S6).

The throttle control signal a corresponding to the target throttle opening degree To set in step S5 or S6 as described above is output to the throttle actuator 4 (S7), and the throttle valve 3 is operated to the target opening degree TO. In addition, in accordance with the mode setting in step S4, in step S8, the regulation of gears during automatic speed control including constant speed driving control is calculated, and a 4th speed prohibition signal, for example, is output to the speed change control controller 8B. It is something. Furthermore, the acceleration timer Tac is counted up (8
9) Run the above routine for a predetermined time (for example, 30m5ec)
It is executed every time.

FIG. 4 shows a mode setting subroutine for automatic speed control in step S4 of the main routine. In step SlO, it is determined whether or not the automatic speed control start condition is satisfied, and when the automatic speed control condition is satisfied, 5ll-8
16, the start flag S is activated when the set switch 17 is turned on.
F is set, the acceleration timer Tac is reset, the brake release flag BF is reset, and the target vehicle speed Vo is updated with the actual vehicle speed Vn, so that the vehicle speed when the set switch 17 is turned off becomes the set target vehicle speed Vo.

When the target vehicle speed VO is set as described above, automatic speed control is entered (517), the brake and accelerator are not operated (818, 519), and the set switch 17, coast switch 19, and resume switch 18
is not operated, steps 820 to S24
If the determination is No, the vehicle speed feedback control mode (2) (constant speed driving control) is entered. This vehicle speed feedback control mode (■) calculates the throttle opening degree Tv necessary to achieve the target vehicle speed Vo by PI-PD calculation etc. based on the deviation between the actual vehicle speed Vn and the target vehicle speed Vo, and calculates the throttle opening degree Tv required to achieve the target vehicle speed Vo. Set the opening degree to To.

Further, when the brake is operated during the vehicle speed feedback control (81g), the brake release flag BF is set (525), and the mode shifts to the normal throttle control mode (2).

Even when the automatic speed control conditions are not satisfied, each flag is reset (S27) and then the target vehicle speed VO is
Even if it is not set (S L?), the normal throttle control mode I is entered. Normal throttle control mode I selects a basic throttle opening map corresponding to accelerator opening α and shift mode M (economy, normal, power), etc., reads basic throttle opening Tb for detected accelerator opening α, Throttle control is performed to set the target throttle opening degree To with necessary correction.

On the other hand, when the accelerator is operated, step S19 is YES.
If the S judgment is made and the brake is not being released (32B), the mode shifts to the accelerator acceleration mode ■. In the accelerator acceleration mode (2), the target throttle opening To is set by the sum of the target throttle opening Tv and the throttle opening Tb corresponding to the depressed accelerator opening α. Further, when the set switch 17 is operated, the set switch operation process A is performed based on a YES determination in step S20. In this set switch operation processing, when an acceleration request is made when the acceleration timer Tac exceeds a set value (delay time), a shift flag for issuing a 4th speed prohibition command is set, and a transition is made to the acceleration mode. In this acceleration mode, the load compensation opening degree corresponding to the slope driving condition is determined, and the target throttle opening degree To is set so that the vehicle is accelerated at a constant acceleration based on the throttle opening degree for flat ground constant acceleration acceleration. . Further, when the coast switch 19 is turned on for deceleration, step S
21, coast switch operation processing B is performed. This coast switch operation processing B is based on the target vehicle speed V
Update o and shift to coast mode. In this coast mode, the target throttle opening To is set to 0 while the coast switch is operated, the throttle valve 3 is fully closed to perform deceleration, and the actual vehicle speed Vn when off is set to the target vehicle speed Vo to control vehicle speed feedback. It returns to

Further, when the resume switch 18 is turned on in order to reset the target vehicle speed Vo to the original setting value in a state where the automatic speed control is canceled by the brake operation, step S22
If the determination is YES, the resume switch operation C is entered, and the resume operation is held while the vehicle accelerates to the original target vehicle speed Vo (523), and the resume switch action C is entered.

In this resume switch operation, when the deviation between the target vehicle speed Vo and the actual vehicle speed Vn has not converged, the target throttle opening degree To is shifted to the acceleration mode and acceleration is performed at a constant acceleration up to the target vehicle speed Vo. This is what you set.

Next, although the details of the shift regulation control in step S8 of the main routine are not shown, in the vehicle speed feedback mode ■, corresponding to the control mode setting described above, the vehicle speed deviation (
The gear shift is controlled while determining the torque margin based on V o-V n) and the throttle opening
Set up (fast stop) and upshift (4th gear permission). For example, if the throttle opening TH is greater than 80%, there is no torque margin and the vehicle speed is set to 3rd gear (4th gear prohibited) even if the vehicle speed has converged, and if the throttle opening TH is less than 80%, the vehicle speed does not converge and is low and the throttle opening TH Even if the torque is 60% or more, control is performed to prohibit fourth gear as there is insufficient torque, and a shift prohibition command is output.

On the other hand, in the acceleration mode, a 4th speed prohibition command is output to downshift the gear, and in the coast mode, a 4th speed prohibition command is similarly outputted to downshift the gear and increase engine braking. Furthermore, even during the resume operation, if the vehicle speed deviation is large, a 4th speed prohibition command is output to downshift the gear stage.

FIG. 5 shows the main routine of the shift pattern switching part in the shift control of the automatic transmission 5 by the shift control controller 8B. First, the actual vehicle speed Vn1, the accelerator opening α,
Input the throttle opening TH, etc. (83G), and in step S3L it is determined whether automatic speed control is in progress, and if this determination is N.
In the case of normal throttle control at O, step 833
．． In S34, a shift pattern in which a gear position is set corresponding to the accelerator opening degree α and the vehicle speed Vn is searched, and the gear position of the corresponding zone of the shift pattern is read based on the detected accelerator opening degree α and the actual vehicle speed Vn. A speed change signal is output (S87). Also, in the case of the accelerator acceleration mode of automatic speed control (S32), the gear stage is set based on the signals of the accelerator opening degree α and the vehicle speed Vn in the same manner as described above.

On the other hand, if the accelerator is not accelerating during automatic speed control (S
31.532), the accelerator is not operated, so in step S (5, S38) a shift pattern in which the gear position is set only in response to the vehicle speed Vn is searched, and the shift pattern is searched based on the detected actual vehicle speed Vn. reads the gear position of the corresponding zone of the gear shift pattern and outputs the gear shift signal (S37
).

The shift pattern based only on the vehicle speed in step 335 is as follows:
The vehicle speed at the shift point is set to correspond to the vehicle speed at the shift point at which the accelerator opening degree in the shift pattern of step S33 is approximately 1/2, so that load fluctuations in a relatively wide range can be accommodated. Note that step 333
Instead of the shift pattern corresponding to the accelerator opening and vehicle speed, a shift pattern may be used in which gear stages are set corresponding to the throttle opening and vehicle speed.

If, for example, a 4-leg prohibition command signal is input from the throttle control controller 8A during the automatic speed control, even if the gear stage read from the shift pattern is 4th gear, it will be set to 3rd gear. This controls downshifting.

According to the embodiment described above, in the throttle control state where the throttle opening is controlled in response to the driver's accelerator operation, the gear change control is performed with good responsiveness based on the accelerator opening and the vehicle speed, and the constant speed is maintained. Automatic speed control, including travel control, uses a simple control system to perform gear change control in response to changes in driving conditions, even when an accelerator opening signal cannot be obtained, by setting gears based solely on vehicle speed. In addition, even if hunting occurs in the control amount of constant speed driving control, the speed change control can be performed without using the control amount of constant speed driving control, such as the throttle opening, without causing any hunting.

In particular, in the above embodiment, a shift pattern in which the gears are set in accordance with the accelerator opening degree and the vehicle speed is used for shift control when constant speed driving control is not being executed. This provides excellent control responsiveness. That is,
In the above-mentioned throttle control, the throttle opening that is actually opened and closed in response to changes in the accelerator opening does not accurately follow small changes in the accelerator opening, and various delays such as delay processing are required during this time. Corrections are being made. Therefore, when the driver operates the accelerator and the engine output is controlled accordingly, it is important to perform the gear change control in accordance with the accelerator opening in order to improve the shift response during kick-down gear shifts. It is possible to perform control that meets the driver's requirements.

In addition, in the above embodiment, an example is shown in which a throttle control means is provided to electrically control the throttle opening for purposes other than constant speed driving control, but it is also possible to control the throttle opening at a constant speed while maintaining mechanical linkage between the throttle valve and the accelerator pedal. The present invention is also applicable to a structure that adjusts the throttle opening degree during speed running control. Further, the throttle control controller and the speed change control controller may be configured integrally.

(Effects of the Invention) According to the present invention as described above, when the vehicle speed is controlled by engine output control by the constant speed driving control means, the speed change control of the automatic transmission reduces the engine load accompanying the control of the constant speed driving control. By performing the shift control based only on the vehicle speed and not on the detection signal corresponding to fluctuations, shift control can be performed appropriately without shift hunting.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram for clearly showing the configuration of the present invention, FIG. 2 is a control system diagram in one embodiment, FIG. 3 is a main flowchart diagram showing the entire control operation of the throttle control controller, and FIG. The figure is a flowchart of the main part thereof, and FIG. 5 is a flowchart of the main part of the speed change control controller. E, 1...Engine, B...Output control means, C...Constant speed traveling control means, D...
・Vehicle speed detection means, G... Automatic transmission, H...
...speed change control means, J...first gear setting means, K...second gear setting means, 8A, 8B.
...Controller, 9...Vehicle speed sensor,
11... Accelerator sensor diagram Figure 1 Figure 3

Claims (1)

[Claims] (1) A constant speed driving control means is installed to perform constant speed driving control by adjusting the engine output so as to maintain the actual vehicle speed at the target vehicle speed, and a speed change control means is provided to perform speed change control even during constant speed driving control. In a control device for an automatic transmission, when constant speed driving control is not being executed, the speed change control means is configured to control the speed change based on a speed change pattern in which a speed change position is set in accordance with an engine load such as an accelerator opening and a vehicle speed. a first gear position setting means for setting a gear position to a gear position; and a first gear position setting means for setting a gear position to a gear position, and a first gear position setting means for changing a gear position based on a speed change pattern in which a gear position is set corresponding only to the vehicle speed when constant speed driving control is executed. 1. A control device for an automatic transmission, comprising: second gear setting means for setting a gear.