JP2571353Y2 - Shift pattern control device for automatic transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a shift pattern control device for an automatic transmission that changes the shift pattern of the automatic transmission.

(Prior Art) Conventionally, as a shift pattern control device for an automatic transmission,
For example, "Automotive Engineering Extra Edition 12 All the 4WD"
(Issued on December 2, 1987, Issued by: Railway Japan Co., Ltd.)
On pages 262 to 270 are known.

This conventional source has a normal shift pattern and a high-speed shift pattern as shift patterns, which can be arbitrarily switched to both patterns by a manual switch operation, and in which the transfer is in a two-wheel drive state or a four-wheel drive and a sub-shift. When the sub-transmission is switched from the high gear (hereinafter referred to as H4) to the low gear (hereinafter referred to as L4) by four-wheel drive from the machine, the normal transmission pattern is automatically changed to the high rotation transmission pattern. This is shown by a shift pattern control device for an automatic transmission that is switched.

(Problems to be Solved by the Invention) However, such a conventional shift pattern control device automatically switches the shift pattern to the high-speed shift pattern when switching from the two-wheel drive state to the H4 state. It is not an alternative configuration.

For this reason, when switching from the two-wheel drive state to the H4 state in order to obtain powerful traveling, in addition to such transfer switching operation, the automatic transmission shift pattern is changed from the normal shift pattern to the high-speed shift pattern. There is a problem that the operation for switching to the pattern must be performed, and the operation is troublesome.

The present invention has been made in view of the above-described problems. When the transfer is switched from the two-wheel drive state to the four-wheel drive state, the automatic transmission automatically switches to the high-speed transmission pattern. Another object of the present invention is to provide a shift pattern control device for a vehicle and further improve the usability of the shift pattern control device.

(Means for Solving the Problems) In order to solve the problems described above, in the automatic transmission transmission pattern control device according to the first aspect, as shown in the claim correspondence diagram of FIG. An automatic transmission b connected to a transfer a that can be switched to a wheel drive state; and controlling a shift timing of the automatic transmission b based on an input from a predetermined input means. A shift pattern control unit c having a high-speed shift pattern for shifting after the engine has reached a high speed, and a selecting unit for arbitrarily selecting the normal speed pattern and the high-speed shift pattern. In the shift pattern control device for an automatic transmission, a switch detecting unit d that detects a transfer switching state and a high-speed shift pattern prohibition selecting unit e are provided as the input unit, The shift pattern control means c sets the high rotation speed at the time of switching the four-wheel drive side of the transfer a when the high-speed shift pattern prohibition is not selected and the shift pattern is not arbitrarily selected by the selection means. The shift timing is controlled by the shift pattern, and when the shift means is arbitrarily selected by the selecting means, the shift timing is controlled by the selected shift pattern. In the case where an arbitrary selection of the shift pattern is not performed by the selecting means, the shift timing control based on the high-speed shift pattern is prohibited even when the four-wheel drive side is switched.

(Operation) In the shift pattern control device of the automatic transmission according to the present invention, when the transfer a is switched from the two-wheel drive state to the four-wheel drive state in order to perform a powerful running, the shift is normally performed (when the high-speed shift pattern prohibition is not selected). In the shift pattern control unit c, the switch is detected by the switch detection unit d, and the shift pattern is changed from the normal shift pattern to the high-speed shift pattern.

Therefore, it is possible to perform a powerful four-wheel drive traveling without having to manually switch the shift pattern.

Further, for example, when the transfer a is set to the four-wheel drive state for traveling on the low μ road and the high rotation speed change pattern is not set as described above, the selection operation of the high rotation speed change pattern prohibition selecting means e is performed. Is performed, the control based on the high rotation speed change pattern is prohibited.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 2 to 5 of the accompanying drawings.

 First, the configuration of the embodiment will be described.

FIG. 2 is an explanatory view showing a shift pattern control device of the automatic transmission according to the embodiment of the present invention.

In the figure, reference numeral 1 denotes an automatic transmission, 2 denotes an engine, and the automatic transmission 1 includes a torque converter 10 having a torque increasing action in a low speed ratio region, a gear train 11 including a planetary gear device, and the like. The gear train 11 is constituted by a hydraulic control mechanism 12 that generates a control oil pressure for engaging or disengaging a shift element of the gear train according to a shift position.

Further, a transfer 15 is incorporated in the automatic transmission 1 via a subtransmission 16. This transfer 15
, The vehicle can be switched between a rear wheel drive (2WD) state and a four wheel drive (4WD) state, and the auxiliary transmission 16 allows the high geared 2WD, 4WD state (2H, 4H) and the low geared four wheel drive state ( 4L).

The transfer 15 has a wet multi-plate clutch 17, and when the 2-4 switching solenoid 21s, which will be described later, is turned on, is supplied with operating hydraulic pressure and is engaged to be in a four-wheel drive state.

The operations of the automatic transmission and the transfer are controlled by the control unit 20.

As shown, the control unit 20 includes a front wheel speed sensor 21a, a pattern select switch 21 on the input side.
b, kick down switch 21c, power supply voltage 21d, 2-4 select switch 21e, 4WD power pattern prohibition switch 21
f, steering angle sensor 21g, idle switch 21h, full throttle switch 21j, throttle sensor 21k, engine rotation signal 21
m, an inhibitor switch 21p, a temperature sensor 21q, a rear wheel speed sensor 21r, and a 2-4 switching solenoid 21s, and a shift solenoid 22a, a shift solenoid 22b, an overrun clutch solenoid 22c, and a lock-up solenoid
22d, 2-4 switching solenoid 21s, line pressure solenoid 22e,
A dropping resist 22f and a power shift indicator lamp 22g are provided.

Briefly describing these components, the front wheel speed sensor 21a is a sensor that detects the rotational speed of the front wheels.

The pattern select switch 21b (corresponding to a selection means) is used to manually select a shift pattern of the automatic transmission 1 manually. The normal shift pattern shown in FIG. A switch for manually selecting a power pattern (high-speed shift pattern) shown in FIG. 4 that has a higher engine speed at the shift time than the pattern, and is optimal for performing a powerful running with emphasis on acceleration.

The kick down switch 21c is a switch that is turned on when an accelerator pedal (not shown) is fully opened.

As shown in FIG. 5, the 2-4 select switch 21e has two positions, "AUTO 2WD" and "AUTO 4WD", and selects one of the two positions.

The 4WD-time power pattern prohibition switch 21f is a switch for prohibiting the shift control by the power pattern during 4WD by automatic control by the control unit 20 described later.

Each of the steering sensors 21g is a sensor that detects a steering angle.

The idle switch 21h is a switch for detecting a fully closed throttle valve (not shown).

The full throttle switch 21j is a switch for detecting that a throttle valve (not shown) has a predetermined opening degree or more.

The throttle sensor 21k is a sensor that detects the opening and the opening speed of a throttle valve (not shown).

The inhibitor switch 21p is a switch for detecting the position of a select lever (not shown).

The temperature sensor 21q is a sensor that detects the temperature of the cooling water.

The rear wheel speed sensor 21r is a sensor that detects the rotation speed of the rear wheel.

The shift solenoids 22a and 22b are provided. A solenoid for selecting a shift point gear position appropriate for the vehicle running state.

The overrun clutch solenoid 22c is a solenoid for controlling an engine braking effect.

The lock-up solenoid 22d is a solenoid for adjusting a line pressure according to a vehicle running condition.

The 2-4 switching solenoid 21s is connected to the transfer 1
A solenoid for switching between 2WD state and 4WD state in 5; switches to 4WD in ON state and 2WD in OFF state
Switch to.

The line pressure solenoid 22e is a solenoid for adjusting an oil pump discharge pressure (not shown) to a line pressure suitable for a vehicle running state.

The power shift indicator lamp 22g is a lamp that is lit to indicate that a shift control state of a power pattern is being performed.

 Next, the operation of the embodiment will be described.

First, 2WD in the control unit 20 of the embodiment,
The basic control of 4WD switching will be described.

(B) At 2WD In the above 2-4 select switch 21e, select "AUTO 2W
When "D" is selected, the control unit 20
Usually, a control signal is output to the 2-4 switching solenoid 21s so as to be in the 2WD state, and the two vehicle speed sensors 21a, 21
Based on the detection of r, when a rear wheel slip or a rear wheel slip on a low μ road is detected, control to automatically switch to 4WD (4H) is performed.

Further, the optimum gear change pattern for a desired traveling state can be arbitrarily selected by the pattern select switch 21b.

(B) 4WD At the time of 2-4 select switch 21e, "AUTO 4W
When "D" is selected, the control unit 20
Normally, a control signal is output to the 2-4 switching solenoid 21s so as to be in the 4WD state, and both vehicle speed sensors 21a, 21
When r and the steering angle sensor 21g detect a tight corner braking state or continuous running on a high μ road,
Control to switch to 2WD state.

Next, the operation of the part constituting the shift pattern control means in the control unit 20 of this embodiment will be described with reference to the flowchart of FIG.

In step 101, the pattern select switch 21b
The signal is read from the power pattern prohibition switch 21f or the 2-4 changeover solenoid 21s at 4WD or 4WD, and the process proceeds to step 102.

In step 102, it is determined whether or not the pattern has been selected by the pattern select switch 21b. If the selection has been made, the process proceeds to step 103 for determination, and if not, the process proceeds to step 104 for determination.

In step 103, it is determined whether or not the normal pattern is selected. If the normal pattern is selected, the process proceeds to step 106, where the shift timing of the normal pattern is controlled, and
If this selection has not been made, the routine proceeds to step 107, where shift timing control of the power pattern is performed.

In step 104, it is determined whether or not the 2-4 switching solenoid 21s is ON. If it is ON, the process proceeds to the next determination step 105, and if it is OFF, the process proceeds to step 106, and shift timing control is performed in a normal pattern.

In step 105, 4WD power pattern prohibition switch
It is determined whether or not 21f is ON. If it is ON, the process proceeds to the step 106, and if it is OFF, the process proceeds to a step 107 of the process to control the shift timing of the power pattern.

Therefore, in the case of the present embodiment, 2
When "AUTO 4WD" is selected by the -4 select switch 21e, the 2-4 switching solenoid 21s is turned on, and the transfer 15 switches from the 2WD state to the 4WD state.

Therefore, in the shift pattern control portion of the control unit 20, the 4WD power pattern prohibition switch 21f is turned off.
If so, automatically change the shift pattern from the normal pattern to the power pattern, and select the pattern select switch.
With 21b, powerful four-wheel drive traveling can be performed without the need to manually change the shift pattern.

Also, when it is not desired to perform the shift timing control based on the power pattern as described above, such as when the vehicle is in the 4WD state for traveling on a low μ road such as a snowy road, the 4WD power pattern prohibition switch 21f is turned on. In this case, the shift timing control of the normal pattern is performed.

When a shift pattern is selected by the pattern select switch 21b, the selection is given priority.

As described above, the shift pattern control device for an automatic transmission according to the embodiment has an effect that a powerful four-wheel drive traveling can be enjoyed without performing a troublesome operation. Since the automatic control can be prohibited by the pattern prohibition switch 21f, the effect of good usability can be obtained.

The embodiment of the present invention has been described in detail with reference to the drawings.
The specific configuration is not limited to this embodiment.

For example, although the 2-4 switching solenoid is used as the switching detecting means in the embodiment, other means such as a 2-4 switching select switch may be used as long as it detects the switching state between 2WD and 4WD. Is also good. In the present embodiment, since 2WD and 4WD are automatically switched, it is preferable that an output system such as a 2-4 switching solenoid is provided.

The shift pattern may have at least a normal shift pattern and a high-speed shift pattern. For example, other shift patterns such as a snow pattern that is optimal for traveling on a snowy road without shifting to the first speed may be used. You may have.

In addition, as a normal pattern and a power pattern,
In the present embodiment, a pattern having only one fixed pattern is shown, but a variable pattern may be formed with a certain variable width.

(Effects of the Invention) As described above, in the shift pattern control device of the present invention, when the transfer is set to the four-wheel drive state, the shift is automatically switched to the high-speed shift pattern. In a shift pattern control device for an automatic transmission having at least a plurality of shift patterns of a normal running pattern and a high-speed shifting pattern, an effect that a powerful four-wheel drive running can be enjoyed without performing a troublesome operation is obtained.

In addition, since the high-speed gear shift pattern prohibition selecting means is provided so that the above-described automatic high-speed gear shift pattern control can be prohibited, in addition to the above-described effects, soft four-wheel drive traveling is also selected. The effect that can be obtained is obtained.

[Brief description of the drawings]

FIG. 1 is a claim correspondence diagram showing a shift pattern control device for an automatic transmission according to the present invention, FIG. 2 is an overall system diagram showing a shift pattern control device for an automatic transmission according to an embodiment, and FIG. FIG. 4 is a shift characteristic diagram showing a power pattern of the embodiment, FIG. 5 is a perspective view showing a 2-4 select switch of the embodiment, and FIG. 6 is a control unit of the embodiment. It is a flowchart figure which shows the flow of control operation of a shift pattern control part. a ... Transfer b ... Automatic transmission c ... Shift pattern control means d ... Switch detection means e ... High speed shift pattern prohibition selection means

Claims (1)

(57) [Scope of request for utility model registration] An automatic transmission connected to a transfer switchable between a two-wheel drive state and a four-wheel drive state; a shift timing of the automatic transmission controlled based on an input from a predetermined input means; A shift pattern control means having a high-speed shift pattern in which the engine shifts after the engine has a higher rotation speed than the shift timing of the normal shift pattern; and arbitrarily selecting the normal speed pattern and the high-speed shift pattern A shift pattern control device for an automatic transmission, comprising: a shift detecting unit that detects a transfer switching state; and a high-speed shift pattern prohibition selecting unit, as the input unit. If the high-speed gearshift pattern prohibition is not selected and the gearshift pattern is not arbitrarily selected by the selector, the The shift timing is controlled by the high-speed shift pattern at the time of switching the four-wheel drive side of the wheel, and when the shift means is arbitrarily selected by the selecting means, the shift timing is controlled by the selected shift pattern. When the high-speed gear shift pattern prohibition is selected and the shift pattern is not arbitrarily selected by the selection means, the shift timing control based on the high-speed gear shift pattern is prohibited even during the four-wheel drive side switching. A shift pattern control device for an automatic transmission.