JPH0512509Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention includes a first cylinder chamber and a second cylinder chamber, and guides air into the first or second cylinder chamber to move the piston to the first or second position. An automatic transmission for a vehicle is provided with an actuator for positioning the piston at a neutral position by guiding air into both cylinder chambers, and a position detecting means for detecting the first, second and neutral positions of the piston. Regarding improvements.

[Prior art] As an automatic system that achieves both fuel efficiency and easy drive, sensors such as an engine rotation sensor and vehicle speed sensor and an actuator for operating the clutch and transmission are added to the conventional mechanical clutch and transmission. Mechanical automatic systems are known in which these are controlled by a control unit to change shifts.

FIG. 1 is a drawing showing an embodiment of the present application, of which known parts will be explained in order to understand the invention of the present application.

In Figure 1, transmission cover 1
, a shift fork shaft 2 driven by a shift actuator 20 is provided parallel to the axis of the transmission body (not shown), and a striker 3 linked to the shift fork (not shown) is provided at one end of the shift fork shaft 1. It is provided.

In the shift actuator 20, first and second cylinder chambers (hereinafter referred to as chambers) A and B are defined by a piston 21, and each chamber and the piston 21
Annular pistons 22a and 22b that can move together with the piston 21 are interposed between the first and second electromagnetic valves (hereinafter referred to as valves) 23a and 22b, which are normally open and in the exhaust state. It is adapted to be selectively connected to the air tank 24 via 23b.

The piston rod 25 of the piston 21 is integrally connected to the shift fork shaft 2, and between the piston rod 25 and the transmission cover 1 are located the first, second and neutral positions of the piston 21, that is, the striker 3, that is, the shift fork shaft 2. Position detection means for detecting positions X, Y and neutral position N is provided. This detection means consists of three electric switches, namely a Y position switch 4Y, an X position switch 4X and a neutral position switch 4N, which are adapted to engage and close a recess formed in the piston rod 25.
The figure shows neutral position switch 4.
This shows the state where N is closed. And the first
When the valve 23a is energized and opened to guide the air in the air tank 24 to the first chamber A, the piston 21 moves to the right in the figure together with the piston 22a, moving the shift fork shaft 2, that is, the striker 3, to the first position, for example, 3rd speed. position to shift position Y. Second chamber B
When air is introduced to
position to shift position X. Also, both chambers A,
When air is introduced to B, the striker 3 is positioned at the neutral position N.

By the way, in this device, for example, from 3rd gear to 4th gear
When shifting to high speed, open the second valve 23b and
When the position switch 4Y turns OFF, the first valve 23a is also opened to determine whether the neutral position switch 4N is ON, and after determining ON, the first valve 23a is closed. There are two so-called double-lung type control systems in which it is determined whether the neutral position switch 4N is on by opening the valves 23a and 23b, and after determining whether the neutral position switch 4N is ON, the first valve 23a is closed.

However, in the single-lung type, the output of the actuator 20, that is, the gear pulling force, is large as shown by the solid line in FIG. In addition, in the double-lung type shown by the chain line, there is a problem that the output of the actuator 20 is insufficient and the gear cannot be disengaged, especially at low temperatures when the oil viscosity is high.

On the other hand, the present applicant in Utility Application No. 60-26361,
We are proposing an automatic transmission system that solves the problem of not being able to shift gears.

In addition, Japanese Utility Model Application Publication No. 60-75743 discloses a method in which the operation of a change lever is converted into an electric signal to control an electromagnetic valve, and a pair of large and small combination pistons installed opposite each other is used to suitably change gears. A technique for performing this is disclosed. However, such known technology is preferably activated when the pressure inside the tank decreases, and the structure of the actuator becomes complicated.

Further, Japanese Utility Model Application Publication No. 60-108849 discloses a remote control device for a transmission that controls the actuator of the transmission with a solenoid valve and has good responsiveness and no gear noise. However, in this known technique, the gear engagement speed is controlled to prevent gear noise, and the inconvenience caused by insufficient output of the actuator cannot be resolved.

[Problems to be Solved] Therefore, an object of the present invention is to provide an automatic transmission for a vehicle with a simple configuration that can eliminate the drawbacks of the single-lung type and double-lung type described above and can suitably control the gear pulling force. be.

[Means for Solving the Problems] According to the present invention, a first cylinder chamber and a second cylinder chamber are provided, and air is guided to the first or second cylinder chamber to position the piston at the first or second position. An actuator that guides air into the cylinder chamber to position the piston at a neutral position, and position detection means that detects the first, second, and neutral positions of the piston are provided, and the clutch and transmission are actuated by the actuator. In an automatic transmission for a vehicle, a first gear removing means guides air to a first and second cylinder chamber to move a piston to pull out a gear, and a first gear removing means guides air to the first or second cylinder chamber to pull out a gear. and a control means for controlling the second gear disengaging means to operate when the position detecting means does not detect gear disengaging after a predetermined period of time after operating the first gear disengaging means. and the control means starts a timer after the clutch is disengaged, operates the first gear removal means, determines whether the position detection means is turned OFF, and if NO, the gear cannot be removed. After a predetermined period of time has elapsed, the first gear removing means is deactivated, the second gear removing means is activated, and after the position detection means is turned off, the first and second gear removing means are activated to remove the piston. It has a neutral position function.

[Description of effects] Therefore, the first and second gear disengagement means are operated to operate in the neutral position in the double-lung type, but if the gear is not disengaged after a certain period of time, the position detection means is activated. is determined by not turning OFF, and in that case, the first gear removing means is deactivated and the second gear removing means is activated to forcefully remove the gear in a single-lung type. As a result, when the position detecting means detects that the gear has been disengaged, the first gear disengaging means and the first gear disengaging means are operated, so that the double-lung type is in the neutral position, and stable operation can be performed.

Therefore, according to the present invention, if the gear comes out with the double-lung type, it will remain as it is, but if the gear does not come out due to insufficient actuator output with the double-lung type, the single-lung type will forcefully pull out the gear. Wear of the shift fork is prevented.

[Preferred Embodiment] When implementing the present invention, the predetermined time is preferably 1 second.

[Examples] Examples of the present invention will be described below with reference to the drawings.

Figure 1 shows a fully automatic transmission in which the present invention is implemented, with each position switch 4X, 4Y, 4
N and each valve 23a, 23b are connected to a control unit 40 which is a control means.

A feature of the present invention is the control mode of the control unit 40, which will be explained below.

In FIG. 2, a control unit 40 is provided with a central processing unit (CPU) 41, which controls each switch, each valve, the vehicle speed sensor 30, and the accelerator opening sensor 31 via an input/output device (I/O). A ROM 43 for storing a shift map (to be described later) and a timer 44 for measuring the required time to are also provided. The central processing unit 41 also includes a vehicle speed sensor 30 and an accelerator opening sensor 31.
determines the shift change according to the shift map stored in the ROM 43 based on the detection signal from the
An actuation signal is output to each valve 23a, 23b, and when the output is made, air is guided into the first and second chambers A, B to move the piston 21 to pull out the gear. When the position switch does not detect gear removal after a predetermined period of time T has elapsed after activation, the second means for guiding air to one chamber A or B is controlled so as to operate the so-called one-lung type. .

Next, the operation will be explained mainly with reference to FIG. 3, taking as an example the case of shifting from 1st speed to 2nd speed.

When the control unit 40 determines that it is necessary to shift from the first gear to the second gear, it disengages the clutch using known control and then starts the timer 44 (step
S1), both the valves 23a and 23b are opened and the first gear removing means, so-called double-lung type, is operated to remove the piston 2.
1 to the left (step S2, state I in Fig. 4), then determine whether Y position switch 4Y is turned off, that is, whether the first gear is out of gear (step S3), and if YES is determined. The process moves to step S7, and if NO, that is, if the 1st gear has not been disengaged, the process proceeds to step S4 after a predetermined period of time has passed (step S4,
At time to) in Fig. 4, the first valve 23a is opened and the second gear release means, so-called single-lung type, is activated (step S5, state in Fig. 4), and then the Y position switch 4Y is turned OFF. When the first gear is released (step S6), the first valve 23a is opened, both valves are opened, and the piston 2 is opened.
1 to the neutral position (step S7), and when the neutral N signal of the N position switch 4N continues to be ON for a predetermined period T (for example, 200 microseconds when shifting to 2nd gear), that is, the piston 21 After holding in the neutral position for a predetermined time T (step S8), the first valve 23a is closed (step S9).
Piston 21 moves to the left and X position switch 4
When X is ON, that is, when 2nd gear is engaged (step S10), connect the clutch (step S10).
S11), once the clutch has been connected (step
S12), the second valve 23b is closed and both valves are closed (step S13).

[Advantages of the Invention] As described above, the present invention provides the following excellent advantages:

(i) Gear removal is performed using a double-lung system, resulting in stable operation and less wear on shift forks, etc.

(ii) Only when the gear cannot be removed, the single-lung system uses a powerful force to remove the gear, making it possible to remove the gear even in winter when the viscosity of the lubricating oil is high.

(iii) Therefore, with a simple configuration, smooth gear removal is possible without damaging the shift system.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
Fig. 2 is a control block diagram of the control unit, Fig. 3 is a control flow chart, Fig. 4 is a timing chart of actuator output, and Fig. 5 is an explanatory diagram of conventional so-called single-lung type and double-lung type shift modes. It is. A...First chamber, B...Second chamber, 2...Shift fork shaft, 4X, 4Y, 4N...Position switch, 20...Shift actuator, 23a...First valve, 23b...second valve,
40...Control unit.

Claims (1)

[Scope of utility model registration request] The piston is positioned in the first or second position by guiding air into the first or second cylinder chamber, and the piston is positioned in the neutral position by guiding air into both cylinder chambers. An automatic transmission system for a vehicle in which a clutch and a transmission are actuated by the actuator, which comprises an actuator that positions the piston, and position detection means that detects the first, second, and neutral positions of the piston. a first gear extractor that guides air into the cylinder chamber and moves the piston to extract the gear; and a first or second gear extractor.
a second gear pulling means which guides air into the cylinder chamber of the cylinder chamber to pull out the gear; A control means is provided for controlling the operation of the means, and the control means starts a timer after the clutch is disengaged, operates the first gear disengagement means, and determines whether the position detection means is turned OFF or not. If the answer is NO that the gear cannot be pulled out, the first gear pulling means is deactivated after a predetermined period of time has elapsed, the second gear pulling means is activated, and after the position detection means is turned OFF, the first and An automatic transmission for a vehicle, characterized in that it has a function of operating a second gear removal means to put a piston in a neutral position.