JP2594417Y2 - Control device for automatic transmission - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an automatic transmission.

[0002]

2. Description of the Related Art Conventionally, during forward traveling at a predetermined vehicle speed or higher,
2. Description of the Related Art There is known a control device for an automatic transmission in which a reverse speed is not formed even when a select lever is operated to a reverse range (for example, see Japanese Patent Application Laid-Open No. 60-37446).

That is, in this conventional device, a state in which hydraulic pressure can be supplied and a state in which hydraulic pressure cannot be supplied are provided in a hydraulic circuit for supplying hydraulic pressure to a low and reverse brake which is a friction element to be engaged when establishing a reverse speed. , And a control circuit for switching the switching valve to a state in which the hydraulic pressure cannot be supplied at a speed equal to or higher than a predetermined vehicle speed.

[0004]

By the way, generally, when the select lever is operated to the reverse range, this fact is transmitted to the rear of a following vehicle or the like, and the reverse lamp is turned on to illuminate the rear at night. However, in the above-described conventional apparatus, the reverse lamp is also turned on unconditionally when the reverse range is operated. For this reason, even in a state in which the automatic transmission is prevented from going into the reverse speed by operating the switching valve, the reverse lamp is turned on when the reverse operation is performed to select the reverse range, and the following vehicle is actually turned on. There is a problem that erroneous information as if the vehicle is traveling backward is transmitted while traveling forward.

The present invention has been made in view of the above-mentioned conventional problems. The reverse lamp is prohibited from being turned on during the reverse prohibition operation, and erroneous information is transmitted to a following vehicle or the like. The goal is not to.

[0006]

Therefore, in order to achieve the above-mentioned object, according to the present invention, as shown in the claim correspondence diagram of FIG. 1, the automatic transmission a is operated in response to the operation of the select lever a.
Let t be the forward speed or reverse speed, and select lever a
When the is set to the reverse range, the lamp switch turns on.
Control means c for turning on the reverse lamp b by the control circuit
A reverse prohibition unit d for prohibiting the automatic transmission at from forming a reverse speed, and a vehicle speed provided to the control unit c.
Under a predetermined condition such that is greater than a predetermined value, the reverse prohibiting means d is prohibited and the select lever is operated to the reverse range.
In a control device for an automatic transmission provided with a reverse control unit f that maintains forward traveling even when the reverse control unit f performs reverse prohibition control, the control unit c turns on the reverse lamp b. Lighting prohibition command by prohibiting electric signal
Is provided to the lighting control circuit .

[0007]

For example, when the predetermined condition such as the vehicle speed being lower than the predetermined value is not satisfied, the reverse prohibition means d does not perform the reverse prohibition operation. Therefore, when the select lever a is selected to the reverse range, the automatic transmission at forms the reverse speed, and at the same time, the reverse lamp b is turned on.

For example, when a predetermined condition that the vehicle speed is equal to or higher than a predetermined value is satisfied, the reverse control means f performs the reverse prohibition operation under the control of the reverse control section f, and the lighting control section g performs the light prohibition operation. Do. Therefore, even if the reverse range is selected by the select lever a, the automatic transmission at does not form the reverse speed and the reverse ramp b
Also does not light.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

First, the configuration of the embodiment will be described.

FIG. 2 is a schematic view showing an automatic transmission according to an embodiment of the present invention and a control device for the automatic transmission, wherein AT is an automatic transmission, E is an engine, and the automatic transmission AT has an engine. A gear train GT into which the output rotation of E is input via a torque converter TC is incorporated.

FIG. 3 is a schematic diagram showing the configuration of the gear train GT. The gear train GT includes a front planetary gear set 2 including a front sun gear 2s, a front pinion gear 2p, a front internal gear 2i, and a front carrier 2c. , Rear sun gear 4s, rear pinion gear 4p, rear internal gear 4i, rear carrier 4
c and the rear planetary gear set 4 provided with tandem arrangement c.

The gear train GT includes a reverse clutch R / C connecting the input shaft IN and the front sun gear 2s, a high clutch H / C connecting the input shaft IN and the front carrier 2c,
A forward clutch F / C connecting the front carrier 2c and the rear internal gear 4i, a brake band B / B fixing the front sun gear 2s to the housing side,
A friction element such as a low and reverse brake L & R / B for fixing the front carrier 2c to the housing is provided.

A forward one-way clutch F / OC is provided between the forward clutch F / C and the rear internal gear 4i, and a low one-way clutch L / C is provided between the front carrier 2c and the housing. An OC is provided, and an overrun clutch ORC is arranged in parallel with the forward one-way clutch F / OC between the front carrier 2c and the rear internal gear 4i.

By the way, in the gear train GT, as shown in Table 1 below, various types of friction elements are provided with an operating hydraulic pressure supplied from a hydraulic pressure supply circuit (control means) CV provided above the automatic transmission AT. Various speeds can be obtained by fastening and releasing by the line pressure.

[0016]

[Table 1] In this table, a circle indicates a fastened state, and a blank indicates an open state. Therefore, at the reverse speed, the reverse clutch R /
C and the low and reverse brake L & R / B are engaged.

The forward one-way clutch F / OC is free when the rear internal gear 4i is rotated relative to the front carrier 2c in the forward rotation direction, locked when the rear internal gear 4i is rotated in the reverse rotation direction, and is connected to the low one-way clutch. L / OC is free when the front carrier 2c rotates in the normal rotation direction, and locked when the front carrier 2c rotates in the reverse rotation direction.

The overrun clutch O ·
Although the R / C is not shown in Table 1, by engaging the overrun clutch ORC, the function of the forward one-way clutch F / OC is eliminated and the engine brake is operated. Has become.

As described above, the level of the line pressure for operating each friction element and the supply / supply stop thereof are performed by the hydraulic pressure control circuit CV.
2 are switched according to the operation of the select lever SL shown in FIG. 2 and the driving of each of the solenoids 11 to 15. In addition, each solenoid 11 to 15
Is driven by an A / T control unit (control means) 10. That is, the A / T control unit 10 includes one range switch, two
Inhibitor switch 21 consisting of a range switch, a D range switch, a P range switch, and an R range switch
, A vehicle speed sensor 22, an oil temperature sensor 23, and an idle switch 31, a full throttle switch 32, a throttle sensor 33, an engine speed sensor via an ECCS control unit 30 for controlling driving of the engine E. 34 is input. Then, based on these signals, the line pressure solenoid 1
1, the lock-up solenoid 12, the first shift solenoid 13, the second shift solenoid 14, the timing solenoid 15, the oil path switching solenoid 16, and the turning on / off of the reverse lamp 17 are controlled.

Then, as shown in Table 2 below, each shift speed can be obtained by switching ON / OFF of the first and second shift solenoids 13 and 14.

[0021]

[Table 2] The switching of the first and second shift solenoids 13 and 14 by the A / T control unit 10 is as follows.
It is determined based on the throttle opening obtained from the throttle sensor 33, the vehicle speed signal obtained from the vehicle speed sensor 22, and the like. For example, the shift is controlled according to a shift schedule determined by the vehicle speed and the throttle opening shown in FIG. .

In addition, the oil passage switching solenoid 16 of this embodiment
Is for operating the oil passage switching valve 7 as a reverse prohibition means. That is, in the present embodiment, as shown in FIG. 5, the reverse clutch R in the hydraulic pressure supply circuit CV is provided.
An oil passage switching valve 7 is provided in the middle of an oil passage 71 for supplying the oil pressure to / C. And this oil passage switching valve 7
Indicates the first position for supplying the hydraulic pressure, which is the position when the oil passage switching solenoid 16 is not driven, to the reverse clutch R / C, and the hydraulic pressure, which is the position when the oil passage switching solenoid 16 is being driven. It is formed to be switchable to a second position for draining to the tank T. In the state where the automatic transmission A is in the second position, the reverse clutch R / C is not engaged even if the select lever SL is operated to select the R range.
At T, the reverse speed cannot be formed.

The control of the oil passage switching solenoid 16 and the reverse lamp 17 by the A / T control unit 10 will be described. As shown in FIG. 6, the A / T control unit 10 includes an oil passage switching solenoid 1.
6, a reverse drive circuit 10b for outputting a signal to the solenoid drive circuit 10a, and a lighting control circuit 10c for controlling turning on and off of the reverse lamp 17. .

The operation of the reverse control circuit 10b will be described with reference to the flowchart of FIG.

In step 101, the vehicle speed V is set to a predetermined vehicle speed V
In the step of determining whether or not K is equal to or greater than K, the process proceeds to step 102 with YES, and proceeds to step 103 with NO.

Step 102 is an oil passage switching solenoid 1
6 is a step of driving the motor.

Step 103 is an oil passage switching solenoid 1
6 is a step of setting the non-driving state.

Next, the operation of the lighting control circuit 10c will be described with reference to the flowchart of FIG.

In step 201, the inhibitor switch 2
A step of determining whether or not a signal indicating that the range is from 1 to the R range is input.
And proceeds to step 204 with NO.

Step 202 is a step for judging whether or not the reverse control circuit outputs a signal for turning on the oil passage switching solenoid 16. If YES, proceed to Step 204, and if NO, proceed to Step 203.

Step 203 is a step in which the reverse lamp 17 is turned on.
Step 4 is a step in which the reverse lamp 17 is turned off.

Next, the operation of the embodiment will be described.

A) Normal time When the vehicle speed V is lower than VK, the automatic transmission AT is shifted to each speed in accordance with the position where the select lever SL is operated. Therefore, if you select the R range,
The automatic transmission AT is set to the reverse speed, and at the same time, the reverse lamp 17 is turned on (the flow of steps 201 → 202 → 203).

B) High-speed running When running at a vehicle speed V equal to or higher than a predetermined vehicle speed VK, the oil passage switching solenoid 16 is driven (steps 101 and 102).

If the select lever SL is erroneously operated to the R range during such traveling, the oil passage 71
The oil supplied to the reverse clutch R / C through the drain is drained to the tank T, the automatic transmission AT cannot form the reverse speed, and the reverse ramp 17
Is not turned on (step 201 → 204).

Therefore, there is no problem that a reverse speed is formed while the vehicle is moving forward, and there is no problem that the reverse lamp 17 is turned on while the vehicle is actually moving forward.

Although 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, and even if there is a design change within a scope not excluding the gist of the present invention. Included in the present invention.

For example, in the embodiment, the condition for driving the oil passage switching solenoid 16 is only the predetermined vehicle speed VK or more, but it may be determined at the same time whether or not the vehicle is traveling forward. In addition, it is possible to prevent a problem such as prohibiting the formation of the reverse speed when traveling backward. As a means for detecting the forward running state, a means for detecting the rotation direction of the output shaft, and in an automatic transmission, a change in the gear ratio occurs when the vehicle speed and the throttle opening are in a state to be shifted. There are various means, such as making a determination based on whether (forward) is possible or not (retreat).

[0039]

As described above, in the control device of the automatic transmission according to the present invention, when the reverse control unit performs the reverse prohibition control, the electric signal for prohibiting the lighting of the reverse lamp is provided.
The automatic transmission forms a reverse speed even if the select lever is selected to the reverse range to protect the automatic transmission, etc., for the purpose of protecting the automatic transmission, etc. When the reverse control unit is performing the prohibition operation of the reverse prohibition means so as not to cause the reverse lamp to light even if the lighting restriction control unit performs the light prohibition operation and the select lever is operated to the reverse range. Therefore, there is an effect that erroneous information is not transmitted to a following vehicle or the like.

[Brief description of the drawings]

FIG. 1 is a diagram corresponding to claims showing a control device of an automatic transmission according to the present invention.

FIG. 2 is a schematic configuration diagram showing the entire control device of the automatic transmission according to the embodiment of the present invention;

FIG. 3 is a schematic configuration diagram showing a gear train of the embodiment device.

FIG. 4 is an explanatory diagram showing a shift schedule used in the embodiment device.

FIG. 5 is a hydraulic circuit diagram illustrating a configuration of a main part of the embodiment device.

FIG. 6 is a circuit diagram showing a configuration of a main part of the embodiment device.

FIG. 7 is a flowchart showing a control flow of a main part of an A / T control unit of the embodiment device.

FIG. 8 is a flowchart illustrating a control flow of a main part of an A / T control unit of the apparatus according to the embodiment.

[Explanation of symbols]

 at Automatic transmission a Select lever b Reverse ramp c Control means d Reverse prohibition means f Reverse control unit g Lighting control unit

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16H 59/00-61/12 F16H 61/16-61/24 F16H 63/40-63/48 B60Q 1 / twenty two

Claims (1)

(57) [Scope of request for utility model registration] An automatic transmission is set to a forward speed or a reverse speed according to operation of a select lever, and
Lighting control that turns on the lamp switch when operating in the reverse range
Control means for turning on a reverse lamp by a circuit; reverse prohibition means for prohibiting the automatic transmission from forming a reverse speed; predetermined conditions provided in the control means, such that the vehicle speed is higher than a predetermined speed. Then, the reverse prohibition means is prohibited , and
A control device for an automatic transmission including a reverse control unit that maintains forward traveling even when the lever is operated in the reverse range. The control unit may include a reverse control unit that performs reverse prohibition control. , An electric signal to prohibit the lighting of the reverse lamp
A control device for an automatic transmission, comprising: a lighting restriction control unit that outputs a lighting prohibition command to a lighting control circuit .